WESTERN GAS RESOURCES INC
10-K, 1996-03-22
NATURAL GAS TRANSMISSION
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               UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549

                                   FORM 10-K
(Mark One)

[ X ]  Annual report pursuant to section 13 or 15(d) of the Securities Exchange
       Act of 1934 [Fee Required] for the fiscal year ended December 31, 1995 or

[  ]   Transition report pursuant to section 13 or 15(d) of the Securities
       Exchange Act of 1934 [No Fee Required] for the transition period from
       _________________ to _________________


                        Commission file number 1-10389
                                               -------


                          WESTERN GAS RESOURCES, INC.
- --------------------------------------------------------------------------------
            (Exact name of registrant as specified in its charter)


             Delaware                                          84-1127613
- --------------------------------------              ----------------------------
   (State or other jurisdiction of                         (I.R.S. Employer
   incorporation or organization)                          Identification No.)

12200 N. Pecos Street, Denver, Colorado                        80234-3439
- --------------------------------------------------------------------------------
 (Address of principal executive offices)                      (Zip Code)

                                (303) 452-5603
- --------------------------------------------------------------------------------
              Registrant's telephone number, including area code

                                  No Changes
- --------------------------------------------------------------------------------
   (Former name, former address and former fiscal year, if changed since last
                                    report).

    Title of each class                     Name of exchange on which registered
- -----------------------------               ------------------------------------
Common Stock, $0.10 par value                       New York Stock Exchange

$2.28 Cumulative Preferred Stock, $0.10 par value   New York Stock Exchange

$2.625 Cumulative Convertible Preferred Stock,      New York Stock Exchange
$0.10 par value    


Securities registered pursuant to Section 12(g) of the Act:  None

Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the preceding 12 months (or for such shorter period that the registrant was
required to file such reports), and (2) has been subject to such filing
requirements for the past 90 days. Yes   X   No _____
                                       -----         

The aggregate market value of voting common stock held by non-affiliates of the
registrant on March 1, 1996 was $183,434,693.


DOCUMENTS INCORPORATED BY REFERENCE

The information required by Part III of this Report (Items 10, 11, 12 and 13) is
incorporated by reference from the registrant's proxy statement to be filed
pursuant to Regulation 14A with respect to the annual meeting of stockholders
scheduled to be held on May 22, 1996.

Indicate by check mark if disclosure of delinquent filers to Item 405 of
Regulation S-K is not contained herein, and will not be contained, to the best
of registrant's knowledge, in definitive proxy or information statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K. [  ]

Reference is made to listing beginning on page 52 of all exhibits filed as a
part of this report.

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<PAGE>
 
                          Western Gas Resources, Inc.
                                   Form 10-K
                               Table of Contents
                                                              
<TABLE>
<CAPTION>
Part   Item(s)                                                                            Page
                                                                                          ----
<S>    <C>          <C>                                                                   <C> 
I.     1 and 2.     Business and Properties...........................................       3
                      General.........................................................       3
                      Principal Facilities............................................       4
                      Gas Gathering and Processing....................................       5
                      Significant Acquisitions and Projects...........................       6
                      Marketing.......................................................       8
                      Producing Properties............................................       9
                      Competition.....................................................       9
                      Regulation......................................................      10
                      Insurance and Operational Risks.................................      10
                      Employees.......................................................      11
       3.           Legal Proceedings.................................................      11
       4.           Submission of Matters to a Vote of Security Holders...............      11                               
II.    5.           Market for Registrant's Common Equity and Related             
                    Stockholder Matters...............................................      12
       6.           Selected Financial Data...........................................      13
       7.           Management's Discussion and Analysis of Financial                         
                      Condition and Results of Operations.............................      14
       8.           Financial Statements and Supplementary Data.......................      25
       9.           Changes in and Disagreements with Accountants on                          
                    Accounting and Financial Disclosure...............................      51
III.   10.          Directors and Executive Officers of the Registrant................      51
       11.          Executive Compensation............................................      51
       12.          Security Ownership of Certain Beneficial Owners and                        
                      Management......................................................      51
       13.          Certain Relationships and Related Transactions....................      51 
IV.    14.          Exhibits, Financial Statement Schedules, and Reports on                    
                      Form 8-K........................................................      52 
</TABLE>

                                       2
<PAGE>
 
                                    PART I

ITEMS 1 AND 2. BUSINESS AND PROPERTIES

GENERAL

Western Gas Resources, Inc. (the "Company") is an independent gas gatherer,
processor and marketer with operations located in major oil- and gas-producing
basins in the Rocky Mountain, Gulf Coast and Southwestern regions of the United
States. The Company owns and operates natural gas gathering, processing and
storage facilities and markets and transports natural gas and natural gas
liquids ("NGLs"). The Company provides necessary services to the producers of
natural gas and NGLs by connecting producers' wells to the Company's gathering
system for delivery to its processing plants, processing the gas to remove NGLs
and by-products and marketing the gas and NGLs throughout the United States.
Most of the natural gas processed by the Company is associated gas from oil
wells. The Company also owns certain producing properties, primarily in
Louisiana and Texas.

Historically, the Company has derived over 95% of its revenues from the sale of
natural gas and NGLs. Set forth below are the Company's revenues by type of
operation (000s):

<TABLE>
<CAPTION>
                                                                 Year Ended December 31,
                                         ----------------------------------------------------------------------
                                            1995            %         1994           %           1993      %
                                         ----------    ---------   ----------    --------    ---------   ------

<S>                                      <C>           <C>         <C>          <C>         <C>         <C>
Sale of residue gas...............       $  876,399         69.7   $  707,869        66.6    $ 563,068     60.4
Sale of NGLs......................          331,760         26.4      309,358        29.1      333,880     35.8
Processing, transportation and                                                                         
  storage revenues................           41,358          3.3       35,057         3.3       25,622      2.7
Other, net........................            7,467           .6       11,205         1.0        9,768      1.1
                                         ----------    ---------   ----------   ---------    ---------   ------
                                                                                                       
                                         $1,256,984        100.0   $1,063,489       100.0    $ 932,338    100.0
                                         ==========    =========   ===========  =========    =========   ====== 
</TABLE>

The Company expanded through acquisitions, internal project development and
increased marketing activity. These activities have strengthened the Company's
position in major producing basins and expanded its access to multiple natural
gas markets. The table below illustrates the Company's growth from December 31,
1990 to December 31, 1995:

<TABLE>
<CAPTION>
                                 Average      Average           Average for the Year Ended
                                                          --------------------------------------
                                 Residue        NGL          Gas           Gas           NGL
                                Gas Sales      Sales      Throughput    Production    Production
                                 (MMcf/D)     (MGal/D)     (MMcf/D)      (MMcf/D)      (MGal/D)
                                ---------     --------    ----------    ----------    ----------

<S>                             <C>           <C>         <C>           <C>           <C>
December 31, 1990............       220           630          217          164            680
December 31, 1995............     1,572         2,890        1,020          779          2,181
% increase...................       615           359          370          375            221
</TABLE>                                                              
                                                                      
The Company has developed a three-part business plan to increase profitability
through expanding its gas marketing activities, acquiring or developing gas
gathering and processing assets that meet the Company's target rates of return
and increasing the efficiency of its existing facilities. As a part of its
initial implementation of the business plan, the Company has (i) restructured
its marketing department along more specialized lines designating separate
managers for national accounts, end-use sales and electric power marketing, (ii)
added business development personnel dedicated to acquiring gas supplies for its
existing facilities, and (iii) reduced its operating expenses. See further
discussion at "Management's Discussion and Analysis of Financial Condition and
Results of Operations - Forward Looking Information."

The Company's principal offices are located at 12200 North Pecos Street, Denver,
Colorado 80234-3439, and its telephone number is (303) 452-5603. The Company was
incorporated in Delaware in 1989.

                                       3
<PAGE>
 
PRINCIPAL FACILITIES

The following table provides information concerning the Company's principal
facilities.  The Company also owns and operates several smaller treating and
processing facilities located in the same areas as its other facilities.

<TABLE>
<CAPTION>
 
                                                                                          Average for the year ended
                                                        Gas          Gas                       December 31, 1995
                                                                                 ------------------------------------------
                                                      Gathering   Throughput        Gas             Gas             NGL
                                      Year Placed      Systems     Capacity      Throughput      Production      Production
           Facility (1)               In Service      Miles(2)    (MMcf/D)(2)    (MMcf/D)(3)     (MMcf/D)(4)    (MGal/D)(4)
- ---------------------------------     ----------      --------    -----------    -----------     -----------    -----------
<S>                                   <C>            <C>          <C>            <C>             <C>            <C>
SOUTHERN REGION:                                                               
 Texas                                                                         
  Midkiff /Benedum...............        1955          2,042          135            135              87              835
  Giddings Gathering System......        1979            651           80             71              62               99
  Edgewood(5)(8).................        1964             85           65             28              11               74
  Perkins........................        1975          2,564           40             21              12              146
  MiVida (5).....................        1972            286          150             44              41                -
  Gomez(13)......................        1971            302          280             72              69                -
  Mitchell Puckett(13)...........        1972             86          140              -               -                -
  Crockett Gathering System......        1973            136            -             27              27                1
  Rosita Treating System.........                          -           60             56              56                -
  Katy(6)........................        1994             17            -              -               -                -
 Louisiana                                                                                                         
  Black Lake.....................        1966             55           75             53              36              120
  Toca(7)(8).....................        1958              -          160             74               -               49
                                                                                                                   
NORTHERN REGION:                                                                                                   
Oklahoma                                                                                                           
  Chaney Dell/Lamont.............        1966          2,003          180             83              63              259
  Arkoma.........................        1985             38            8              2               2                -
  Westana System(9)..............        1986            246           45             55              48               49
 Wyoming                                                                                                           
  Granger(8).....................        1987            236          210            130             119              189
  Red Desert(8)..................        1979            110           42             30              27               45
  Lincoln Road(10)...............        1988            146           50             38              35               41
  Hilight Complex(5)(8)..........        1969            619           80             34              29               86
  Kitty and Amos Draw(8).........        1969            304           17             11               8               47
  Newcastle(8)...................        1981            144            5              3               2               19
  Reno Junction(11)..............        1991              -            -              -               -               49
 New Mexico                                                                                                        
  San Juan River(5)..............        1955            126           60             33              30                1
 North Dakota                                                                                                      
  Williston(12)..................        1981            381            -              8               6               28
  Temple(5)......................        1984             65            7              3               2                8
  Teddy Roosevelt(12)............        1979            332            -              3               2               14
 Utah                                                                                                              
  Four Corners...................        1988             97           15              4               4               10
 Montana                                                                                                           
  Baker(5)(8)....................        1981              8            3              2               1               12
                                                      ------        -----          -----             ---            -----
                                                                                                                   
   Total.........................                     11,079        1,907          1,020             779            2,181
                                                      ======        =====          =====             ===            =====
</TABLE>

_____________________________
Footnotes on following page

                                       4
<PAGE>
 
(1)  The Company's interest in all facilities is 100% except for Midkiff/Benedum
     (74%); Black Lake (69%); Lincoln Road (72%); Williston (50%); Westana (50%)
     and Newcastle (50%).  All facilities are operated by the Company and all
     data include interests of the Company, other joint interest owners and
     producers of gas volumes dedicated to the facility.
(2)  Gas gathering systems miles and gas throughput capacity are as of  December
     31, 1995.
(3)  Aggregate wellhead natural gas volumes collected by a gathering system.
(4)  Volumes of residue gas and NGLs are allocated to a facility when a well is
     dedicated to that facility; volumes exclude NGLs fractionated for third
     parties.
(5)  Sour gas facility (capable of processing gas containing hydrogen sulfide).
(6)  Hub and gas storage facility.
(7)  Straddle plant (a plant located near a transmission pipeline which
     processes gas dedicated to or gathered by the pipeline company or another
     third-party).
(8)  Fractionation facility (capable of fractionating raw NGLs into end-use
     products).
(9)  Gas throughput and gas production in excess of gas throughput capacity is
     unprocessed gas delivered directly to an unaffiliated pipeline.
(10) Commencing in March 1996, the Company and its joint venture partner at the
     Lincoln Road gas plant temporarily suspended processing operations at the
     Lincoln Road plant and began processing the related gas at the Company's
     Granger facility. If volumes increase substantially beyond Granger's
     capacity, the Lincoln Road plant might be re-started. The Company
     anticipates that this consolidation will result in lower overall plant
     operating expenses for the combined systems.
(11) NGL production represents conversion of third-party feedstock to iso-
     butane.
(12) Processing facility has been shut-in since August 1993.  The gas dedicated
     to these facilities is processed by a third-party under a contractual
     arrangement.  In January 1996, Koch Hydorcarbon Company ("Koch"), which
     operates the Teddy Roosevelt and Williston Gas Company's ("Williston")
     assets under a lease agreement, exercised its option to purchase certain
     gas gathering assets located in North Dakota from the Company and
     Williston. The closing of the sale is expected to occur on August 1, 1996.
     See further discussion at "Significant Acquisitions and Projects - Other."
(13) Includes assets purchased in October and December 1995 that were combined
     with these existing facilities.

Capital expenditures related to existing operations are expected to be
approximately $76.1 million during 1996 consisting of the following: capital
expenditures related to gathering, processing and pipeline assets are expected
to be $63.2 million, of which $47.6 million will be used for new well connects,
system expansions and asset consolidations and $15.6 million for maintaining
existing facilities. The Company expects capital expenditures on the Katy Gas
Storage Facility ("Katy Facility"), exploration and production activities and
miscellaneous items to be $4.8 million, $3.8 million and $4.3 million,
respectively.

GAS GATHERING AND PROCESSING

The Company contracts with producers to gather raw natural gas from individual
wells located near its plants.  Once a contract has been executed, the Company
connects wells to gathering lines through which the natural gas is delivered to
a processing plant. At the plant, the natural gas is compressed, unfractionated
NGLs are extracted, and the remaining dry residue gas is treated to meet
pipeline quality specifications.  Eight of the Company's processing plants can
further separate, or fractionate, the mixed NGL stream into ethane, propane,
butane and natural gasoline to obtain higher value for the NGLs, and six of the
Company's plants are able to process and treat natural gas containing hydrogen
sulfide or other impurities which require removal prior to transportation. In
addition, the Company has one facility which converts normal butane into iso-
butane.

The Company continually acquires additional natural gas supplies to maintain or
increase throughput levels to offset natural production declines in dedicated
volumes.  Such natural gas supplies are obtained by purchasing existing systems
from third parties or by connecting additional wells.  The opportunity to
connect new wells to existing facilities is primarily affected by levels of
drilling activity near the Company's gathering systems.  The Company believes it
has expanded into areas which present significant potential for new drilling or
purchases of existing systems.  Historically, the Company has connected
additional reserves which more than offset production from reserves dedicated to
existing facilities.  However, certain individual plants have experienced
declines in dedicated reserves.  In 1995, including the reserves associated with
Westana Gathering Company ("Westana") and 1995 acquisitions, the Company
connected new reserves to its gathering systems to replace approximately 94% of
1995 production. On a Company-wide basis, dedicated reserves, including certain
proved undeveloped properties and revisions to previous estimates, decreased
from 2.3 Tcf as of December 31, 1994 (as revised) to approximately 2.1 Tcf at
December 31, 1995. The decrease is primarily due to decreased drilling in areas
in which the Company operates and declines in reserves at the Company's Black
Lake field.

Substantially all gas flowing through the Company's facilities is supplied under
long-term contracts providing for the purchase or processing of such gas for
periods ranging from five to twenty years, using three basic contract types.
Approximately 57% of the

                                       5
<PAGE>
 
Company's gas throughput (exclusive of the Toca straddle plant) for the year
ended December 31, 1995 was purchased under percentage-of-proceeds agreements in
which the Company is typically responsible for arranging for the transportation
and marketing of the natural gas and NGLs. The price paid to producers is a
specified percentage of the net proceeds received from the sale of the natural
gas and the NGLs. This type of contract permits the Company and the producers to
share proportionally in price changes.

Approximately 24% of the Company's gas throughput for the year ended December
31, 1995 was gathered under contracts which are primarily fee-based whereby the
Company receives a set fee for each Mcf of gas gathered. This type of contract
provides the Company with a steady revenue stream that is not dependent on
commodity prices, except to the extent that low prices may cause a producer to
curtail production.

Approximately 19% of the Company's gas throughput for the year ended December
31, 1995 was processed under contracts which combine gathering and compression
fees with "keep-whole" arrangements or well-head purchases. Typically, producers
are charged a gathering and compression fee based upon volume. In addition, the
Company retains a predetermined percentage of the NGLs recovered by the
processing facility and keeps the producers whole by returning to the producers
at the tailgate of the plant an amount of residue gas equal on a Btu basis to
the raw gas received at the plant inlet. The "keep-whole" component of the
contracts permits the Company to benefit when the value of the NGLs is greater
as a liquid than as a portion of the residue gas stream. However, when the value
of the NGLs is lower as a liquid than as a portion of the residue gas stream,
the Company may be affected unfavorably.

SIGNIFICANT ACQUISITIONS AND PROJECTS

The Company's significant acquisitions and projects since January 1, 1993 are:

     Northern Acquisition

In July 1995, the Company entered into an agreement to purchase eight West Texas
gathering systems, consisting of approximately 230 miles of gathering lines in
the Permian Basin, from Transwestern Gathering Company and Enron Permian
Gathering, Inc. In October 1995, the Company acquired and assumed the operations
of the Transwestern Gathering Company assets for an adjusted purchase price of
$4.0 million. Closing on the remaining assets occurred in December 1995 for a
purchase price of $14.7 million. For the month ended January 31, 1996,
throughput on the systems totaled approximately 150 MMcf per day from
approximately 70 wells under fee-based contracts.

     Redman Smackover Joint Venture

Effective January 1, 1995, the Company entered into the Redman Smackover Joint
Venture ("Redman Smackover") agreement with DDD Energy, Inc., a wholly owned
exploration and production subsidiary of Seitel, Inc., Redman Energy
Corporation, and DDD 1995 Oil & Gas Partnership. Redman Smackover acquired
working interests in three producing gas fields in East Texas in the Smackover
formation with an estimated 25 Bcf of proved reserves from Union Oil Company of
California for an adjusted purchase price of $11.0 million. The Company's
contribution to Redman Smackover was approximately $5.4 million through December
31, 1995. The Company is the managing venturer with a 50% ownership interest.

     Oasis

Effective December 1, 1994, the Company acquired the West Texas gathering and
treating assets of Oasis Pipeline Company ("Oasis") for approximately $26.0
million. The Oasis purchase included 14 gathering systems in the Permian Basin
comprising approximately 600 miles of gathering lines and two treating
facilities. In addition, the Company entered into a long-term agreement with
Oasis for 100 MMcf per day of firm transportation service on its intrastate
pipeline. The Company has installed a 200 MMcf per day pipeline interconnection
between this pipeline and the Katy Facility.

     Katy Facility

The Company commenced operations of the Katy Facility in February 1994. The Katy
Facility, which is located approximately 20 miles from Houston, Texas, utilizes
a partially depleted natural gas reservoir with 19 Bcf of working gas capacity
and a pipeline header system, currently connected to eleven pipelines, which has
the capability to deliver up to 400 MMcf per day of natural gas from the
reservoir. Lease acquisition and construction costs incurred through the
commencement of operations, including pad gas, approximated $106.1 million. See
"Marketing - Natural Gas" below.

                                       6
<PAGE>
 
     Mountain Gas

Effective January 1, 1993, the Company acquired the stock of Mountain Gas
Resources, Inc. ("Mountain Gas") from Morgan Stanley Leveraged Equity Fund II,
L.P. for total consideration of approximately $168.2 million, including the
payment of certain transaction costs and the assumption and repayment of $35
million of long-term debt attributable to Mountain Gas.

Mountain Gas owns the Red Desert and Granger facilities, both located near the
Company's Lincoln Road gas processing plant and gathering system. The 22%
interest in the Granger facility previously not owned by Mountain Gas was
purchased by the Company in two separate transactions in November and December
1993 for an aggregate of $27.7 million. At the date of acquisition, the Red
Desert facility consisted of a cryogenic plant and the Granger plant consisted
of a refrigeration unit and a cryogenic unit. In December 1993, the Company
completed construction of an additional cryogenic processing plant at Granger,
at a total additional cost of approximately $4.8 million.

     Black Lake

Effective January 1, 1993, the Company purchased the Black Lake gas processing
plant and related reserves ("Black Lake") from Nerco Oil & Gas, Inc. for
approximately $136.2 million. The acquisition included a 68.9% working interest
in the Black Lake field in Louisiana and a gas processing plant. To increase
the efficiency of Black Lake's processing capabilities, the Company installed a
cryogenic processing plant at a cost of approximately $4.1 million. The
cryogenic processing plant, which became fully operational in October 1994, has
decreased fuel usage and plant operating expenses, and also provides flexibility
to recover or reject ethane.

     Westana Joint Venture

Effective August 1, 1993, the Company formed Westana, a general partnership,
with PanEnergy. Westana provides gas gathering and processing services in the
Anadarko Basin in Oklahoma and markets natural gas and NGLs for producers
connected to its system. The Company is the principal operator, with each
partner holding a 50% ownership interest.

The Company contributed its Chester gas processing plant and gathering system,
with a net book value of $13.8 million, to Westana. The Company also made
additional partnership contributions of $7.2 million through December 31, 1995,
which will be recouped through preferential distributions. In addition to the
assets contributed by the Company, Westana operates PanEnergy's 400 mile
gathering system and six compressor stations, which will be contributed to
Westana by PanEnergy. PanEnergy has received and accepted abandonment approval
by the Federal Energy Regulatory Commission ("FERC") and is now awaiting certain
clarification of the abandonment approval. Upon clarification from the FERC on
the abandonment approval, PanEnergy will contribute its gathering assets to
Westana. The Company expects the contribution of the PanEnergy assets will
occur in 1996.

     Other

The Company continually monitors the economic performance of each of its
operating facilities to ensure that a desired cash flow objective is achieved.
If an operating facility is not generating desired cash flows or does not fit in
with the Company's strategic plans, the Company will explore various options,
such as consolidation with other Company-owned facilities, dismantlement, asset
swap or outright sale. In 1995, the Company sold the Waha Header and certain
non-strategic assets acquired in the Oasis acquisition and completed the
consolidation of its Lamont gathering system with the Chaney Dell system. The
Company anticipates completing the salvage of substantially all of the Lamont
processing plant assets by the end of the first quarter of 1996. In 1994, the
Company sold its Sligo plant, swapped its Pyote treating facilities for
gathering assets in Kansas, which were subsequently disposed of during the
second quarter of 1995, consolidated assets in the Powder River Basin and sold
its Walnut Bend gathering system. The Company anticipates that the salvage of
the Walnut Bend processing plant will be substantially completed by the end of
the third quarter of 1996. Commencing in March 1996, the Company and its joint
venture partner at the Lincoln Road gas plant temporarily suspended processing
operations at that plant and began processing the associated gas at the
Company's Granger facility. If volumes increase substantially beyond Granger's
capacity, the Lincoln Road plant might be re-started. The Company anticipates
that this consolidation will result in lower overall plant operating expenses
for the combined systems. In January 1996, Koch, which operates the Teddy
Roosevelt and Williston assets under a lease agreement, exercised its option to
purchase certain gas gathering assets located in North Dakota from the Company
and Williston. Proceeds from the sale of the gathering assets will be
approximately $2.4 million, of which the Company is entitled to receive $1.5
million. The closing on the sale is expected to occur on August 1, 1996, at
which time the operation of Williston and the Company's Teddy Roosevelt facility
will cease and any remaining assets will be salvaged.

                                       7
<PAGE>
 
MARKETING

     Natural Gas

The Company markets residue gas produced at its plants and purchased from third
parties to end-users, local distribution companies ("LDCs"), pipelines and other
marketing companies throughout the United States. Historically, the Company's
gas marketing was an outgrowth of the Company's gas processing activities and
was directed towards selling gas processed at its plants to ensure their
efficient operation. As the Company expanded into new basins and the natural
gas industry became deregulated and offered more opportunity, the Company began
to increase its third-party gas marketing. Average gas sales increased to
1,572 MMcf per day for the year ended December 31, 1995 compared to 220 MMcf per
day for the year ended December 31, 1990, primarily as a result of increased
third-party sales and sales attributable to acquisitions and to the Katy
Facility, which began operations in 1994. The Company has continued to increase
sales to end-users and to achieve greater market penetration close to its
facilities while also expanding into new markets throughout the United States.

The Company sells gas under agreements with varying terms and conditions in
order to match seasonal and other changes in demand. Most of the Company's
current sales contracts are short-term, ranging from a few days to one year. At
December 31, 1995, the Company's commitment under long-term contracts, several
of which have an annual redetermination of prices and several of which are rebid
prior to expiration, was approximately 300 MMcf per day.

The Company intends to continue to expand its residue gas marketing and third-
party sales, particularly to industrial and commercial end-users. The Company's
marketing department has recently been restructured along more specialized lines
to include separate managers for national accounts, end-use sales and electric
power marketing. The Company has also expanded its marketing in areas beyond
its traditional gas supply centers (Houston and the Gulf Coast) to demand
centers, such as Chicago, New York and California. Third-party sales and
residue gas storage, combined with the stable supply from Company facilities,
enable the Company to respond quickly to changing market conditions and to take
advantage of seasonal price variations and peak demand periods.

The Company customarily stores residue gas in underground storage facilities to
ensure an adequate supply for long-term sales contracts and for resale during
periods when prices are favorable. In order to meet the peaking demand for
residue gas in certain markets, the Company constructed the Katy Facility. The
ability to withdraw gas from the Katy Facility on short notice positions the
Company to market residue gas to LDCs and other customers that need a reliable
yet variable supply of residue gas. The Katy Facility allows the Company to
bypass certain transportation bottlenecks and enhances flexibility in its
marketing operations. The complex utilizes a partially depleted natural gas
reservoir with 19 Bcf of working gas capacity and a pipeline header system,
currently connected to eleven pipelines, which has the capability to deliver up
to 400 MMcf per day of residue gas from the reservoir.

At December 31, 1995, the Company held approximately 12.8 Bcf of residue gas
inventory in underground storage at an average cost of $1.82 per Mcf ($1.65 per
MMBtu), primarily at the Katy Facility. At December 31, 1995, the Company had
hedging contracts in place for anticipated sales for approximately 12.5 Bcf of
stored gas at a weighted average price of $1.88 per MMBtu for the 1995-1996
winter heating season. See "Management's Discussion and Analysis of Financial
Condition and Results of Operations - Liquidity and Capital Resources" and "Note
5 - Risk Management" to the Company's Consolidated Financial Statements
elsewhere in this Form 10-K.

In December 1993, the Company entered into a three-year winter-peaking gas
purchase and sales agreement with a major utility in East Texas which designates
the Katy Facility as the primary delivery point. Under the agreement, which was
amended in August 1994 to expire in March 1997, the utility has the right to
purchase, during each year of the contract, up to approximately 50 MMcf of
residue gas per day in November and March and approximately 140 MMcf of residue
gas per day in December, January and February, at the Houston Ship Channel Index
Price, determined daily, plus a demand charge. The agreement calls for a
minimum demand charge to be paid to the Company for each contract term, whether
or not delivery is taken. This minimum demand charge is calculated based upon
five Bcf of available storage during each fiscal year of the contract term.

In February 1995, the Company entered into a long-term firm storage and
transportation agreement with a St. Louis-based LDC. Under the agreement, the
Company has leased approximately three Bcf of storage capacity of the Katy
Facility to the LDC. The gas will principally serve local distribution
requirements of the LDC's customers in central Missouri.

                                       8
<PAGE>
 
During the year ended December 31, 1995, the Company sold residue gas to
approximately 370 end-users, pipelines, LDCs and other customers. No single
customer accounted for more than 3.5% of consolidated revenues for the year
ended December 31, 1995.


     NGL Marketing

The Company markets NGLs (ethane, propane, iso-butane, normal butane, natural
gasoline, and condensate) produced at its plants and purchased from third
parties in the Rocky Mountain, Gulf Coast and Southwestern regions of the United
States. A majority of the Company's production of NGLs moves to the Gulf Coast
area, which is the largest NGL market in the United States. Through the
development of end-use markets and distribution capabilities, the Company seeks
to ensure that production from the plants moves on a reliable basis, avoiding
curtailment of production.

Consumption of NGLs is primarily determined by various end-user markets
including the petrochemical industry, the petroleum refining industry and the
retail and industrial fuel markets. As an example, the petrochemical industry
uses ethane, propane, normal butane and natural gasoline as feedstocks in the
production of ethylene, which is used in the production of various plastics
products. Over the last several years, the petrochemical industry has increased
its use of NGLs as a major feedstock. Further, various NGLs are used for home
heating and cooling, transportation and for certain agricultural applications.
Demand is primarily affected by price, seasonality and the economy.

The volatility of NGL prices in recent years has caused the Company to move to
short-term contracts, with no prices set on a firm basis for more than a 30-day
period. Although some existing contracts do commit the Company for periods as
long as a year, prices are redetermined on a market-related basis. The Company
leases NGL storage space at major trading locations near Houston and in central
Kansas in order to store products so that they can be sold at higher prices on a
seasonal basis. At December 31, 1995, approximately 15,800 MGal of NGLs were in
storage at an average cost of $.31 per gallon. The Company generally intends
that stored NGLs turn over on an annual basis. The Company from time to time
enters into futures contracts to hedge a portion of its share of condensate and
crude oil production. Although no such hedges were outstanding at December 31,
1995, the Company will continue to enter into futures contracts as management
deems appropriate. See also "Management's Discussion and Analysis of Financial
Condition and Results of Operations - Liquidity and Capital Resources" and "Note
5 - Risk Management" to the Company's Consolidated Financial Statements
elsewhere in this Form 10-K.

For the year ended December 31, 1995, NGL sales averaged 2,890 MGal per day, an
increase from 630 MGal per day in 1990, primarily due to acquisitions during the
five-year period. Sales were made to approximately 170 different customers, and
no single customer accounted for more than 3% of the Company's consolidated
revenues for the year ended December 31, 1995. Revenues are also derived from
contractual marketing fees charged to some producers for NGL marketing services.
For the year ended December 31, 1995, such fees were less than 1% of the
Company's consolidated revenues.

PRODUCING PROPERTIES

Revenues derived from the Company's producing properties comprised approximately
2.6% of revenues for the year ended December 31, 1995. The producing properties
are primarily working interests in a unit operated by the Company comprising the
Black Lake field in Louisiana, which provides production to the Black Lake
plant, and 20 gas properties producing from the Smackover formation of the East
Texas Basin, which provide production to the Edgewood plant. The Company also
has working interests in the Powder River Basin in northeastern Wyoming, the
Sandwash Basin in northwestern Colorado, the Austin Chalk formation in southeast
Texas and the San Juan Basin in southwest Colorado. The Company also owns
various working interests in 13 wells in the Smackover formation through Redman
Smackover.

COMPETITION

The Company competes with other companies in the gathering, processing and
marketing business, both for supplies of natural gas and for customers to which
natural gas and NGLs are sold.  Competition for natural gas supplies is
primarily based on efficiency, reliability, availability of transportation and
ability to obtain a satisfactory price for the producers' natural gas.
Competition for natural gas and NGL customers is primarily based upon
reliability and price of deliverable natural gas and NGLs. For customers that
have the capability of using alternative fuels, such as oil and coal, the
Company also competes based primarily on price against companies capable of
providing such alternative fuels.  The Company's competitors for obtaining
additional gas supplies, for gathering and processing gas and for marketing gas
and NGLs include national and local gas gatherers, brokers,

                                       9
<PAGE>
 
marketers and distributors of various size, financial resources and experience.
In recent years, the Company has also experienced narrowing margins due to the
increasing availability of pricing information to the participants in the
natural gas industry.

REGULATION

The purchase and sale of natural gas and the fees received for gathering and
processing by the Company have generally not been subject to regulation, and
therefore, except as constrained by competitive factors, the Company has
considerable pricing flexibility. Many aspects of the gathering, processing,
marketing and transportation of natural gas and NGLs by the Company, however,
are subject to federal, state and local laws and regulations which can have a
significant impact upon the Company's overall operations.

As a processor and marketer of natural gas, the Company depends on the
transportation and storage services offered by various interstate and intrastate
pipeline companies for the delivery and sale of its own gas supplies as well as
those it processes and/or markets for others. Both the performance of
transportation and storage services by interstate pipelines, and the rates
charged for such services, are subject to the jurisdiction of the FERC under the
Natural Gas Act of 1938 (the "NGA") and the Natural Gas Policy Act of 1978 (the
"NGPA"). The availability of interstate transportation and storage service
necessary to enable the Company to make deliveries and/or sales of residue gas
can at times be pre-empted by other system users in accordance with FERC-
approved methods for allocating the system capacity of "open access" pipelines.
Moreover, the rates charged by pipelines for such services are often subject to
negotiation between shippers and the pipelines within certain FERC-established
parameters and will periodically vary depending upon individual system usage and
other factors. An inability to obtain transportation and/or storage services at
competitive rates can hinder the Company's processing and marketing operations
and/or affect its sales margins.

During the past ten years, the FERC has implemented a nondiscriminatory blanket
transportation program which initially authorized, and ultimately mandated,
interstate natural gas pipelines to perform "open access," self-implementing
(i.e., not generally requiring case-specific certificate authorization)
transportation services.  Order Nos. 636, et seq., which constitute the FERC's
                                          -------                             
most recent issuances in this program, promulgated regulations that
substantially restructure the services provided by interstate pipelines by
"unbundling" (i.e., separating) and separately pricing pipeline gathering,
transportation, storage and sales activities in an effort to enable non-pipeline
merchants to compete with pipelines for gas purchasers on an equal basis. These
regulations have largely been implemented by all interstate transporters
utilized by the Company (as well as by the Company's own non-major interstate
pipeline located in Wyoming) in numerous individual pipeline restructuring and
rate proceedings. The conversion of pipelines from natural gas merchants to
primarily transporters of gas through implementation of the FERC's open access
transportation and restructuring programs has caused the pipelines to incur
significant producer take-or-pay costs and other transition costs resulting from
their abandonment of gas purchasing and sales activities. The FERC has allowed,
and indicated in Order Nos. 636, et seq. that it will continue to allow, the
                                 ------                                     
recovery of some or all of these and related costs from current shippers of gas.
Pipeline flow-through of many of these costs is subject to the outcome of
administrative and appellate proceedings in individual pipeline rate and
restructuring cases, and Order Nos. 636, et seq. themselves are currently the
                                         ------                              
subject of numerous petitions for appellate review presently pending in the
United States Court of Appeals for the District of Columbia Circuit. The outcome
of these proceedings could affect the Company's operations and the costs of
transporting and selling gas.

Pursuant to Section 1(b) of the NGA, production and gathering activities are
exempt from the FERC's jurisdiction; however, judicial precedent has held that
where gathering is performed largely in connection with the delivery of gas in
interstate commerce, such gathering can be considered merely an extension of the
jurisdictional transportation of such gas and thus subject to NGA rate
regulation itself. Recently, primarily as a result of the unbundling of
interstate pipeline gathering services required by Order Nos. 636, et seq., many
                                                                   ------       
pipelines have sought FERC authorization to abandon gathering operations and
facilities previously held to be subject to the NGA. In response to those
requests, the FERC has established a general policy permitting the abandonments
but requiring a showing demonstrating that existing customers have been offered,
for a two-year period, continued service through the abandoned facilities at the
same rates and under the same terms as were previously offered by the pipeline.
The Company has been active in acquiring and/or operating natural gas gathering
facilities abandoned by interstate pipelines and, thus, certain of its
operations and acquisitions have been affected by this FERC policy. The policy
is currently being challenged at both agency and appellate levels, but at this
stage the outcome of such challenges is too speculative to predict.

INSURANCE AND OPERATIONAL RISKS

The Company is subject to various hazards which are inherent in the industry in
which it operates such as explosions, product spills, leaks and fires, each of
which could cause personal injury and loss of life, severe damage to and
destruction of property and equipment, and pollution or other environmental
damage, and may result in curtailment or suspension of operations at the
affected facility. The Company maintains physical damage, comprehensive general
liability, workers' compensation and business interruption insurance. Such
insurance is subject to deductibles that the Company considers reasonable. The
Company is not fully

                                       10
<PAGE>
 
insured against all risks in its business; however, the Company believes that
the coverage it maintains is adequate and consistent with other companies in the
industry.  Consistent with insurance coverage typically available to the natural
gas industry, the Company's insurance policies do not provide coverage for
losses or liabilities relating to pollution, except for sudden and accidental
occurrences.

EMPLOYEES

At December 31, 1995, the Company employed 862 full-time employees, none of whom
was a union member.  The Company considers relations with employees to be
excellent.


ITEM 3.  LEGAL PROCEEDINGS

None.


ITEM 4.  SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

There were no matters submitted to a vote of security holders during the quarter
ended December 31, 1995.

                                       11
<PAGE>
 
                                    PART II

ITEM 5.  MARKET FOR THE REGISTRANT'S COMMON EQUITY AND RELATED STOCKHOLDER
         MATTERS

As of  March 1, 1996, there were 25,773,051 shares of Common Stock outstanding
held by 423 holders of record. The Common Stock is traded on the New York Stock
Exchange under the symbol "WGR". The following table sets forth quarterly high
and low closing sales prices as reported by the NYSE Composite Tape for the
quarterly periods indicated.

<TABLE>
<CAPTION>
                                                             HIGH         LOW
                                                            ------      ------
     <S>                                                    <C>         <C>
     1994          
     First Quarter........................................  $ 35        $ 26 1/8
     Second Quarter.......................................    30          26
     Third Quarter........................................    28 1/2      18 1/2
     Fourth Quarter.......................................    22 1/8      18 1/8
                   
     1995          
     First Quarter........................................    22 1/8      16 3/4
     Second Quarter.......................................    24 1/4      16 5/8
     Third Quarter........................................    18 1/4      15 1/2
     Fourth Quarter.......................................  $ 17 5/8    $ 15
</TABLE>

The Company paid annual dividends on the Common Stock aggregating $.20 per share
during the years ended December 31, 1995 and 1994.  The Company has declared a
dividend of $.05 per share of common stock for the quarter ending March 31, 1996
to holders of record as of March 29, 1996.  Declarations of dividends on the
Common Stock are within the discretion of the Board of Directors. In addition,
the Company's ability to pay dividends is restricted by certain covenants in its
financing facilities, the most restrictive of which prohibits declaring or
paying dividends after December 31, 1995 that exceed, in the aggregate, the sum
of $10 million plus 50% of the Company's  cumulative consolidated net income
earned after December 31, 1995 plus 50% of the net proceeds received by the
Company after December 31, 1995 from the sale of any equity securities.  The
dividends declared in the fourth fiscal quarter of 1995, payable in 1996, are
excluded from this calculation.  At December 31, 1995, this threshold amounted
to $10.0 million.

                                       12
<PAGE>
 
ITEM 6.  SELECTED FINANCIAL DATA

The following table sets forth selected consolidated financial and operating
data for the Company. Certain prior year amounts have been reclassified to
conform to the presentation used in 1995. The data for the three years ended
December 31, 1995 should be read in conjunction with the Company's Consolidated
Financial Statements included elsewhere in this Form 10-K. The selected
consolidated financial data for the two years ended December 31, 1991 is derived
from the Company's historical Consolidated Financial Statements. See also Item
7 - "Management's Discussion and Analysis of Financial Condition and Results of
Operations."

<TABLE>
<CAPTION>
                                                                Year Ended December 31,
                                             -------------------------------------------------------------
                                                 1995         1994         1993        1992        1991
                                             -----------   ----------   ----------  ----------   ---------
                                                  (000s, except per share amounts and operating data)

<S>                                          <C>          <C>           <C>         <C>          <C> 
STATEMENT OF OPERATIONS:                                                                            
Revenues...................................  $1,256,984     $1,063,489      $932,338    $600,116       $358,242
Gross profit...............................      75,211         72,556        92,012      88,192         58,152
Income (loss) before taxes.................      (8,266)  (a)   11,524  (b)   55,631      58,445         32,783
Provision (benefit) for income taxes.......      (2,158)         4,160        17,529      18,757         11,933
Net income (loss)..........................      (6,108)  (a)    7,364  (b)   38,102      39,688         20,850
Earnings (loss) per share of common                                                                  
  stock....................................        (.84)          (.19)         1.25        1.43            .94
                                                                                                     
CASH FLOW DATA:............................                                                          
Net cash provided by operating activities..      86,373         31,866       107,116      96,655         36,228
Capital expenditures.......................      78,521        100,540       492,328      67,021        234,124
                                                                                                     
BALANCE SHEET DATA.........................                                                          
  (at period end):                                                        
Total assets...............................   1,193,997      1,167,362     1,114,748     582,188        552,321
Long-term debt.............................     454,500        418,000       547,000     157,000        216,050
Stockholders' equity.......................     371,909        436,683       314,387     287,021        221,389
Dividends declared per share of common                                                               
  stock....................................  $      .20     $      .20    $      .20    $    .20       $    .15
                                                                                                     
OPERATING DATA:............................                                                          
Average gas sales (MMcf/D).................       1,572          1,097           755         442            310
Average NGL sales (MGal/D).................       2,890          2,970         2,941       2,400          1,097
Average gas volumes gathered (MMcf/D)......       1,020            934           804         669            408
Facility capacity (MMcf/D).................       1,907          1,560         1,586       1,177          1,183
Average gas prices ($/Mcf).................        1.53           1.77          2.02        1.72           1.59
Average NGL prices ($/Gal).................         .31            .28           .31         .32            .36
</TABLE>

(a) In 1995, the Company adopted Statement of Financial Accounting Standards
("SFAS") No.121,"Accounting for the Impairment of Long-Lived Assets and for
Long-Lived Assets to be Disposed of," which resulted in the recognition of a
non-cash loss of $17.6 million. Also, the Company implemented a cost reduction
program to reduce operating and selling and administrative expenses. As a result
of this program, a $2.1 million restructuring charge was incurred, primarily
related to employee severance costs.

(b) In December 1993, a fire at the Granger facility's NGL tank farm required
the facility to be shut down for one week. The new cryogenic processing plant as
well as the smaller existing cryogenic unit were also damaged. Construction of a
new tank farm and repairs to the cryogenic units were completed and fully
operational in August 1994. Claims for physical damage to the Company's
facilities totaled approximately $6.7 million. In addition, the Company
recorded, as other revenue, $3.3 million relating to lost income covered under
its business interruption insurance policy for the year ended December 31, 1994.
As of December 31, 1995, the Company had resolved substantially all remaining
issues and collected all remaining insurance proceeds. The total reimbursements
the Company received under its insurance policies were $6.6 million for physical
damage and $3.9 million related to business interruption.

                                       13
<PAGE>
 
ITEM 7.  MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
         OF OPERATIONS

The following discussion and analysis relates to factors which have affected the
consolidated financial condition and results of operations of the Company for
the three years ended December 31, 1995. Certain prior year amounts have been
reclassified to conform to the presentation used in 1995. Reference should also
be made to the Company's Consolidated Financial Statements and related Notes
thereto and the Selected Financial Data included elsewhere in this Form 10-K.

RESULTS OF OPERATIONS

YEAR ENDED DECEMBER 31, 1995 COMPARED TO YEAR ENDED DECEMBER 31, 1994 (000S,
EXCEPT PER SHARE AMOUNTS AND OPERATING DATA)

<TABLE>
<CAPTION>
                                                      Year Ended
                                                     December 31,        Percent
                                             -------------------------
                                                 1995          1994       Change
                                             ------------   ----------    ------
<S>                                          <C>           <C>           <C>
FINANCIAL RESULTS:
Revenues...................................  $ 1,256,984   $ 1,063,489     18.2
Gross profit...............................       75,211        72,556      3.7
Net (loss) income..........................       (6,108)        7,364   (182.9)
Loss per share of common stock.............         (.84)         (.19)  (342.1)
Net cash provided by operating activities..  $    86,373   $    31,866    171.1
 
OPERATING DATA:
Average gas sales (MMcf/D).................        1,572         1,097     43.3
Average NGL sales (MGal/D).................        2,890         2,970     (2.7)
Average gas prices ($/Mcf).................         1.53          1.77    (13.6)
Average NGL prices ($/Gal).................          .31           .28     10.7
</TABLE>

Net income decreased $13.5 million and net cash provided by operating activities
increased $54.5 million for the year ended December 31, 1995 compared to 1994.
The decrease in net income for the year was primarily due to a $17.6 million 
pre-tax impairment loss recorded in connection with the adoption of SFAS No.
121,"Accounting for the Impairment of Long-Lived Assets and for Long-Lived
Assets to be Disposed of," and a $2.1 million pre-tax restructuring charge the
Company recorded in May 1995 relating to its cost reduction program. In
addition, net income was adversely affected by higher product purchase costs
associated with the Company's third-party residue gas sales and increased
depreciation, depletion and amortization expense and interest expense, partially
offset by higher residue gas volumes sold and higher NGL prices.

Revenues from the sale of residue gas increased approximately $168.5 million for
the year ended December 31, 1995 compared to 1994. Average gas sales volumes
increased 475 MMcf per day to 1,572 MMcf per day for the year ended December 31,
1995 compared to 1994, largely due to an increase of approximately 460 MMcf per
day in the sale of residue gas purchased from third parties. Average gas prices
decreased $.24 per Mcf to $1.53 per Mcf for the year ended December 31, 1995
compared to 1994. The effect of the decrease in residue gas prices on the
Company's net margin from equity production was partially offset by the
Company's futures positions; approximately $10.0 million of gain was recognized
in the year ended December 31, 1995 related to such contracts. The Company has
entered into futures positions for a portion of its equity gas for 1996. See
further discussion at "Forward Looking Information-Hedging."

Revenues from the sale of NGLs increased approximately $22.4 million for the
year ended December 31, 1995 compared to 1994. Average NGL sales volumes
remained relatively constant at 2,890 MGal per day and average NGL prices
increased $.03 per gallon to $.31 per gallon for the year ended December 31,
1995 compared to 1994.

Processing, transportation and storage revenues increased $6.3 million for the
year ended December 31, 1995 compared to 1994. Approximately $3.6 million of the
increase was due to greater NGL revenues from the Company's Giddings system and
increased treating revenue, primarily from gathering systems acquired in
December 1994. The remaining increase was primarily due to a long-term firm
storage and transportation agreement at the Katy Facility that the Company
entered into in February 1995.

                                       14
<PAGE>
 
Other net revenue decreased $3.7 million for the year ended December 31, 1995
compared to 1994.  The difference was primarily attributable to a $3.3 million
insurance recovery recorded in 1994 for business losses associated with the
December 1993 fire at the Company's Granger facility.

The increase in product purchases corresponds to the increase in third-party
residue gas sales.  Combined product purchases as a percentage of residue gas
and NGL sales increased two percentage points to 86%  for the year ended
December 31, 1995 compared to 1994.  The rising gas purchase percentage is a
continuing trend  based upon the growth of third-party sales, which typically
have lower margins than sales of the Company's equity production.  Until
recently, the Company had experienced narrowing margins related to third-party
sales due to the increasing availability of pricing information in the natural
gas industry. The Company believes by targeting end-use markets, these margins
will be stabilized. However, there is no assurance that the Company will be 
successful in capturing these markets.

Plant operating expense increased $2.5 million for the year ended December 31,
1995.  The  increase was attributable to assets purchased in the Oasis
acquisition in December 1994, primarily for property taxes, and taxes on higher
levels of inventory held at the Katy Facility, partially offset by cost savings
resulting from the cost reduction plan initiated in May 1995.

Selling and administrative expense decreased $3.0 million, primarily due to the
cost reduction plan implemented in May 1995.

Depreciation, depletion and amortization increased $1.8 million for the year
ended December 31, 1995 compared to the prior year period.  The increase was
primarily attributable to the Oasis assets, additional depletion related to the
Company's oil and gas production and various plant upgrades and equipment
additions in 1995.

Interest expense increased  $5.7 million for the year ended December 31, 1995
compared to 1994, due to an increase in the Company's average borrowing rate
from 6.6% to 7.5% per annum and higher average debt outstanding during 1995,
primarily due to the redemption of the 7.25% Cumulative Perpetual Convertible
Preferred Stock.

The provision for income taxes for the year ended December 31, 1995 includes a
$300,000 adjustment to reflect management's estimate  of deferred taxes.


YEAR ENDED DECEMBER 31, 1994 COMPARED TO YEAR ENDED DECEMBER 31, 1993 (000s,
EXCEPT PER SHARE AMOUNTS AND OPERATING DATA)

<TABLE>
<CAPTION>
                                                    Year Ended          
                                                    December 31,         Percent
                                             -------------------------
                                                  1994          1993      Change
                                             ------------    ---------   -------
<S>                                          <C>            <C>          <C>
FINANCIAL RESULTS:                                                    
Revenues...................................   $ 1,063,489    $ 932,338     14.1
Gross profit...............................        72,556       92,012    (21.1)
Net income.................................         7,364       38,102    (80.7)
Earnings per share of common stock.........          (.19)        1.25   (115.2)
Net cash provided by operating activities..   $    31,866    $ 107,116    (70.3)
                                                                      
OPERATING DATA:                                                       
Average gas sales (MMcf/D).................         1,097          755     45.3
Average NGL sales (MGal/D).................         2,970        2,941      1.0
Average gas prices ($/Mcf).................          1.77         2.02    (12.4)
Average NGL prices ($/Gal).................           .28          .31     (9.7)
</TABLE>

Net income decreased $30.7 million and net cash provided by operating activities
decreased $75.3 million for the year ended December 31, 1994 compared to the
same period in 1993. Overall, throughput and sales volumes at the Company's
facilities remained comparable to historical levels.  The Company's decrease in
net income and net cash provided by operating activities was primarily
attributable to a decline in NGL and residue gas prices and higher interest,
selling and administrative and depreciation, depletion and amortization costs
associated with the Company's 1993 acquisitions of Black Lake and Mountain Gas,
along with the completion of the Katy Facility construction. In addition,
because of lower demand and lower than expected prices, the Katy Facility did
not generate significant revenue.  As a result, revenues from the Katy Facility
in 1994 did not  fully offset related depreciation, depletion and amortization,
interest and operating costs.

                                       15
<PAGE>
 
Revenues from the sale of residue gas increased approximately $144.8 million for
the year ended December 31, 1994 compared to the same period in 1993, as a
volume increase of 342 MMcf per day was somewhat offset by a decrease in average
residue gas sales prices of $.25 per Mcf. Approximately 300 MMcf per day of the
volume increase was attributable to an increase in the sale of residue gas
purchased from third-parties, primarily resulting from the acquisition of
Citizens National Gas Company assets in the third quarter of 1993. The remaining
volume increase was the result of increased production volumes at the Company's
facilities, primarily due to the Mountain Gas and Black Lake acquisitions, new
well connect activities and consolidations with smaller gathering systems.

Revenues from the sale of NGLs decreased approximately $24.5 million for the
year ended December 31, 1994 compared to 1993, as a volume increase of
approximately 30 MGal per day was more than offset by a $.03 per gallon decrease
in the average NGL sales price. Approximately 22 MGal per day of the volume
increase was attributable to an increase in the sale of NGLs purchased from
third-parties. The remaining volume increase was primarily attributable to the
acquisitions of Mountain Gas and Black Lake, new well connect activity and
consolidations with smaller gathering systems. This volume increase was somewhat
offset by unfavorable economics of ethane and propane extraction in the first
quarter of 1994 and by limited NGL volumes at the Granger facility, primarily as
a result of the December 1993 fire. The curtailment of production while plant
improvements were completed during the third quarter of 1994 at Black Lake also
contributed to lower volumes.

Processing, transportation and storage revenues increased $9.4 million for the
year ended December 31, 1994 compared to the same period in 1993. The increase
was due to additional gathering revenue associated with the Company's Granger
gathering system acquired in the Mountain Gas acquisition in July 1993,
increased gathering revenue at the Company's Lincoln Road facility and the
recognition of demand fees associated with a winter-peaking gas purchase and
sales contract at the Katy Facility during 1994.

Other net revenue increased $1.4 million for the year ended December 31, 1994
compared to the same period in 1993. For the year ended December 31, 1994, the
Company accrued approximately $3.3 million as an amount to be recovered under
its business interruption insurance policy for business losses associated with
the December 1993 fire at the Company's Granger facility and approximately $1.4
million in rate refunds from a pipeline company. These 1994 recoveries were
somewhat offset by a $2.6 million gain recorded as a result of the termination
of interest rate swap agreements in 1993.

Historically, product purchases as a percentage of residue gas and NGL sales
from the Company's plant production have approximated 70%. Product purchases as
a percentage of residue gas and NGL sales from third-party purchases were
substantially higher in 1994 and approximated 95%. Total product purchases as a
percentage of residue gas and NGL sales increased approximately 2.5 percentage
points to 84% for the year ended December 31, 1994 compared to the same period
in 1993. The increase in the Company's combined percentage was primarily due to
an increasing proportion of 1994 residue gas sales revenues resulting from
products purchased from third parties.

Plant operating expense and oil and gas exploration and production costs
increased approximately $6.1 million and $2.2 million, respectively, for the
year ended December 31, 1994 compared to the same period in 1993. The increase
in plant operating expense was primarily due to the additional operating costs
associated with three gas processing facilities acquired from Mountain Gas and
Black Lake in July 1993 and the Katy Facility, which commenced operations in
February 1994. The oil and gas exploration and production cost increase resulted
primarily from costs associated with producing properties acquired in the Black
Lake acquisition.

Selling and administrative expense increased approximately $5.7 million for the
year ended December 31, 1994 compared to the same period in 1993, primarily due
to administrative expenses necessitated by the 1993 acquisitions, an overall
increase in insurance expenditures and a reduction in overhead capitalized to
the Company's construction projects.

Depreciation, depletion and amortization expense increased approximately $19.6
million for the year ended December 31, 1994 compared to the same period in
1993. This increase was primarily due to the acquisitions of Mountain Gas and
Black Lake in July 1993 and the commencement of Katy Facility operations in
February 1994, and was partially offset by lower depreciation and depletion
expense resulting from the addition of recoverable reserves at Black Lake and
Edgewood during 1994.

Interest expense increased approximately $19.0 million for the year ended
December 31, 1994 compared to the same period in 1993, primarily due to
additional borrowings necessitated by the Mountain Gas and Black Lake
acquisitions, a reduction in the amount of interest capitalized to the Katy
Facility and an increase in the Company's variable borrowing rate.

                                       16
<PAGE>
 
LIQUIDITY AND CAPITAL RESOURCES

The Company's sources of liquidity and capital resources historically have been
net cash provided by operating activities, funds available under its financing
facilities and proceeds from offerings of equity securities.  In the past, these
sources have been sufficient to meet the needs and finance the growth of the
Company's business.  The Company can give no assurance that the historical
sources of liquidity and capital resources will be available for future
development and acquisition projects, and it may be required to investigate
alternative financing sources.  Net cash provided by operating activities has
been primarily affected by product prices, the Company's success in increasing
the number and efficiency of its facilities and the volumes of natural gas
processed by such facilities, as well as the margin on third-party residue gas
purchased for resale.  The Company's continued growth will be dependent upon
success in the areas of marketing, additions to dedicated plant reserves,
acquisitions and new project development.

The Company believes that the amounts available to be borrowed under the
Revolving Credit Facility, together with cash provided by operating activities,
will provide it with sufficient financing to connect new reserves, maintain its
existing facilities and complete its current capital improvement projects. The
Company also believes that cash provided by operating activities will be
sufficient to meet its debt service and preferred stock dividend requirements.

The Company's sources and uses of funds for the year ended December 31, 1995 are
summarized as follows (000s):

<TABLE>
<CAPTION>
SOURCES OF FUNDS: 
<S>                                                            <C>      
        Borrowings under long-term debt agreements.....        $   717,400
        Net cash provided by operating activities......             86,373
        Other..........................................             13,445
                                                               -----------
        Total sources of funds.........................        $   817,218
                                                               ===========
                                                                          
USES OF FUNDS:                                                            
        Payments related to long-term debt agreements..        $   682,784
        Capital investments............................             78,521 
        Redemption of the 7.25% Cumulative Senior                         
         Perpetual Convertible Preferred Stock                      42,030
        Payment of preferred dividends.................             11,643
        Payment of common stock dividends..............              5,153
                                                               -----------
                                                                          
        Total uses of funds............................        $   820,131
                                                               =========== 
</TABLE>

Additional sources of  liquidity available to the Company are volumes of residue
gas and NGLs in storage facilities.  The Company stores residue gas and NGLs
primarily to ensure an adequate supply for long-term sales contracts and for
resale during periods when prices are favorable.  The Company held residue gas
in storage for such purposes of approximately 12.8 Bcf  at an average cost of
$1.82 per Mcf ($1.65 per MMBtu) at December 31, 1995 as compared to 21.9 Bcf at
an average cost of $2.16 per Mcf ($1.94 per MMBtu) at December 31, 1994,
primarily at the Katy Facility.  The Company also held NGLs in storage of 15,816
MGal at an average cost of $.31 per gallon and 11,600 MGal at an average cost of
$.30 per gallon at December 31, 1995 and December 31, 1994, respectively, at
various third party storage facilities. At December 31, 1995, the Company had
hedging contracts in place for anticipated sales for approximately 12.5 Bcf of
stored gas at a weighted average price of $1.88 per MMBtu for the 1995-1996
winter heating season.

As of December 31, 1995, the Company had shelf registrations available providing
for the sale of up to $200 million of debt securities and preferred stock and up
to four million shares of common stock.  On February 13, 1996, the Company filed
a registration statement registering an additional $100 million of debt
securities or preferred or common stock, which the Company believes will be
declared effective in April 1996.

The Company has been successful overall in replacing production with new
reserves.  However, volumes of natural gas dedicated to some of the Company's
plants have declined in recent years because additions to dedicated plant
reserves have not fully offset production.  In 1995, including the reserves
associated with Westana Gathering Company ("Westana") and 1995 acquisitions, the
Company connected new reserves to its gathering systems to replace approximately
94% of 1995 production.  On a Company-wide

                                       17
<PAGE>
 
basis, dedicated reserves, including certain proved undeveloped properties and
revisions to previous estimates, decreased from 2.3 Tcf as of December 31, 1994
(as revised) to approximately 2.1 Tcf at December 31, 1995. The decrease is
primarily due to decreased drilling in all areas in which the Company operates
and declines in reserves at the Company's Black Lake field.

In May 1995, the Company redeemed all of the issued and outstanding shares of
its 7.25% Cumulative Senior Perpetual Convertible Preferred Stock (liquidation
preference of $40 million) pursuant to the provisions of the Certificate of
Designation relating to such preferred stock, at an aggregate redemption price
of approximately $42.0 million.

     Risk Management Activities

The Company's policy is to utilize risk management tools primarily to reduce
commodity price risk for its equity production and to lock in profit margins for
its storage and marketing activities. It is the Company's objective to maintain
a balanced portfolio of financial exposure between physical obligations (fixed
price purchase and sales, storage inventories) and related financial instruments
(futures, swaps, and options positions). This effectively allows the Company to
fix its total margin because gains or losses in the physical market are offset
by corresponding losses or gains in the financial instruments market.

Hedging and related activities may expose the Company to the risk of financial
loss in certain circumstances, including instances when (i) production is less
than expected, (ii) the Company's customers fail to purchase or deliver the
contracted quantities of natural gas or NGLs, or (iii) the Company's over-the-
counter ("OTC") counterparties fail to perform. To the extent that the Company
engages in hedging activities, it may be prevented from realizing the benefits
of favorable price changes in the physical market. However, it is similarly
insulated against decreases in such prices.

In 1993, the Board of Directors adopted its Natural Gas Futures Trading
Procedures and created a committee of officers to oversee the Company's risk
management activities. As an additional control, the Company has developed
information systems that allow daily monitoring of its risk management
activities and its exposure related to futures, swaps and options positions
resulting from changes in the market.

The Company uses futures, swaps, and options to reduce price risk and basis
risk. Basis is the difference in price between the physical commodity being
hedged and the price of the futures contract used for hedging. Basis risk is the
risk that an adverse change in the futures market will not be completely offset
by an equal and opposite change in the cash price of the commodity being hedged.
Basis risk exists in natural gas primarily due to the geographic price
differentials between cash market locations and futures contract delivery
locations.

The Company enters into futures transactions on the New York Mercantile Exchange
and the Kansas City Board of Trade and through OTC swaps with creditworthy
counterparties consisting primarily of financial institutions and other natural
gas companies. The Company conducts its standard credit review of OTC
counterparties and has agreements with such parties which contain collateral
requirements. OTC exposure is marked to market daily for the credit review
process. The Company generally uses standardized swap agreements which allow for
offset of positive and negative exposures.

Gains and losses on hedges of product inventory are included in the carrying
amount of the inventory and are ultimately recognized in residue and NGL sales
when the related inventory is sold. Gains and losses related to qualifying
hedges, as defined by SFAS No. 80, "Accounting for Futures Contracts", of firm
commitments or anticipated transactions are recognized in residue and NGL sales
when the hedged physical transaction occurs. The $1.9 million of losses deferred
in inventory at December 31, 1995 were recognized in January 1996 and were more
than offset by margins from the Company's related forward fixed price hedges and
physical sales.

As of December 31, 1995, the Company held a notional quantity of approximately
330 Bcf of natural gas futures, swaps, and options extending from January 1996
to February 1998. This was comprised of approximately 37 Bcf long and 31 Bcf
short of exchange-traded futures and 126 long and 136 short Bcf of OTC swaps and
options. As of December 31, 1994, the Company held a notional quantity of
approximately 210 Bcf of futures, swaps, and options extending through December
1997. This was comprised of approximately 34 Bcf long and 58 Bcf short of
exchange traded futures and 56 long and 62 short Bcf of OTC swaps and options.

The Company enters into speculative futures trades on a very limited basis for
purposes which include testing of hedging techniques. Company procedures contain
strict guidelines for such trading including predetermined stop-loss
requirements and net open positions limits (currently, a total position of 100
net contracts long or short). Speculative futures positions are marked to market
at the end of each accounting period and any gain or loss is recognized in
income for that period. Net gains from such speculative activities for the year
ended December 31, 1995 were not material. See further discussion of hedging
activities at

                                       18
<PAGE>
 
"Liquidity and Capital Resources - Forward Looking Information" and discussion
of other hedging activities at "Interest Rate Swaps."


     Capital Investment Program

Between January 1, 1993 and December 31, 1995, the Company expended
approximately $672 million on new projects and acquisitions. For the years ended
December 31, 1995, 1994 and 1993 the Company expended $79 million, $101 million
and $492 million, respectively, on acquisitions, the construction of the Katy
Facility, connection of new reserves, the acquisition of consolidating assets
for existing systems and upgrades to existing and newly acquired facilities.

Capital expenditures related to existing operations are expected to be
approximately $76.1 million during 1996 consisting of the following: capital
expenditures related to gathering, processing and pipeline assets are expected
to be $63.2 million, of which $47.6 million will be used for new connects,
system expansions and asset consolidations and $15.6 million for maintaining
existing facilities. The Company expects capital expenditures on the Katy Gas
Storage Facility ("Katy Facility"), exploration and production activities and
miscellaneous items to be $4.8 million, $3.8 million and $4.3 million,
respectively.

Depending on the timing of the Company's future projects, it may be required to
seek additional sources of capital.  The Company's ability to secure such
capital is restricted by its credit facilities, although it may request
additional borrowing capacity from the banks, seek waivers from the banks to
permit it to borrow funds from third parties, seek replacement credit facilities
from other lenders or issue additional equity securities.  While the Company
believes that it would be able to secure additional financing, if required, no
assurance can be given that it will be able to do so or as to the terms of any
such financing.

     Financing Facilities

Revolving Credit Facility.  The Company's variable rate Revolving Credit
Facility, as restated on September 2, 1994 and subsequently amended, with a
syndicate of eight banks, provides for a maximum borrowing base of $300 million,
of which $137.5 million was outstanding at December 31, 1995.  If the facility
is not renewed, its commitment period will terminate on October 1, 1997. Any
outstanding balance thereunder at such time will convert to a three-year term
loan, which shall be payable in 12 equal quarterly installments, commencing
January 1, 1998.  The Revolving Credit Facility bears interest, at the Company's
option, at certain spreads over the Eurodollar rate, at the Federal Funds rate
plus .50%, or at the agent bank's prime rate.  The interest rate spreads are
adjusted based on the Company's debt to capitalization ratio.  At December 31,
1995, the spread was 1.25% over the Eurodollar rate, resulting in an interest
rate of 7.21%.

The Company pays a commitment fee on the unused commitment ranging from .15% to
 .375% based on the debt to capitalization ratio.  At December 31, 1995, the
Company's debt to capitalization ratio was .58 to 1 resulting in a commitment
fee rate of .375%.

Term Loan Facility.  The Company also has a Term Loan Facility with four banks
for $25 million which bears interest at 9.87%. Payments on the Term Loan
Facility of $12.5 million are due in  September 1996 and September 1997,
respectively.  The Company intends to finance the $12.5 million payment due in
1996 through amounts available under the Revolving Credit Facility.  The
agreements governing the Company's Revolving Credit and Term Loan Facilities
(the "Credit Facilities Agreement") contain certain mandatory prepayment terms.
If funded debt of the Company, which has a final maturity on or before October
1, 2000, exceeds four times (4.0 to 1.0) the sum of the Company's last four
quarters' cash flow (as defined in the agreement) less preferred stock dividends
projected to be paid during the next four quarters, the overage must be repaid
in no more than six monthly payments, commencing 90 days from notification.
This mandatory prepayment threshold will be reduced to 3.5 to 1.0 at September
1, 1998.  At December 31, 1995, taking into account all the covenants contained
in the Credit Facilities Agreement,  the Company had approximately $50 million
of available borrowing capacity.

The Term Loan and Revolving Credit Facilities are unsecured.  Pursuant to the
Credit Facilities Agreement, the Company is required to maintain a current ratio
(as defined therein) of at least 1.0 to 1.0, a minimum tangible net worth equal
to the sum of $345.0 million plus 50% of consolidated net income earned after
June 30, 1995 plus 75% of the net proceeds received after June 30, 1995 from the
sale of equity securities,  a debt to capitalization ratio (as defined therein)
of no more than  60% through October 31, 1996 and 55% thereafter, and an EBITDA
to interest ratio of not less than 3.00 to 1.0 through October 31, 1996, 3.25 to
1.0 from November 1, 1996 through October 31, 1997 and 3.75 to 1.0 thereafter.
The Company is prohibited from declaring or paying dividends on or after
December 31, 1995 that in the aggregate exceed the sum of $10 million plus 50%
of consolidated net income earned after December 31, 1995 plus 50% of the
cumulative net proceeds received by the Company after December 31, 1995 from the
sale of any equity securities.  The dividends declared in the fourth fiscal
quarter of 1995, payable in 1996, are excluded from

                                       19
<PAGE>
 

this calculation. At December 31, 1995, $10 million was available under this
limitation, which is sufficient to pay required preferred stock dividends in 
1996. The Company generally utilizes excess daily funds to reduce any
outstanding revolving credit balances and associated interest expense and it
intends to continue such practice. The $5.8 million cash balance at December 31,
1995 is an overnight investment necessitated by the timing of cash receipts.

Master Shelf Agreement. In December 1991, the Company entered into a Master
Shelf Agreement (the "Master Shelf") with The Prudential Insurance Company of
America ("Prudential") pursuant to which Prudential agreed to quote, from time-
to-time, an interest rate at which Prudential or its nominee would be willing to
purchase up to $100 million of the Company's senior promissory notes (the
"Master Notes"). Any such Master Notes will mature in no more than 12 years,
with an average life not in excess of 10 years, and are unsecured. The Master
Shelf contains certain financial covenants which substantially conform with
those contained in the Revolving Credit Facility, as restated and amended. In
July 1993 and July 1995, Prudential and the Company amended the Master Shelf to
provide for additional borrowing capacity (for a total borrowing capacity of
$200 million) and to extend the term of the Master Shelf to October 31, 1995.
The Master Shelf Agreement, as restated and amended, is fully utilized, as
indicated in the following table (000s):

<TABLE>
<CAPTION>
                                   Interest         Final        
      Issue Date         Amount      Rate          Maturity                   Principal Payments  Due
- ---------------------   -------    ---------  -------------------   --------------------------------------------
                                
<S>                     <C>        <C>        <C>                   <C>
October 27, 1992        $25,000      7.51%    October 27, 2000      $8,333 each on October 27, 1998 through 2000
October 27, 1992         25,000      7.99%    October 27, 2003      $8,333 each on October 27, 2001 through 2003
September 22, 1993       25,000      6.77%    September 22, 2003    single payment at maturity
December 27, 1993        25,000      7.23%    December 27, 2003     single payment at maturity
October 27, 1994         25,000      9.05%    October 27, 2001      single payment at maturity
October 27, 1994         25,000      9.24%    October 27, 2004      single payment at maturity
July 28, 1995            50,000      7.61%    July 28, 2007         10,000 each on July 28, 2003 through 2007
                         -------                                 

                        $200,000                               
                        ========                               
</TABLE>                                                        


1993 Senior Notes. On April 28, 1993 the Company sold $50 million of 7.65%
Senior Notes due 2003 to a group of insurance companies. Annual principal
payments of $7.1 million on the 1993 Senior Notes are due on April 30 of each
year from 1997 through 2002, with any remaining principal and interest
outstanding due on April 30, 2003. The 1993 Senior Notes contain certain
financial covenants that substantially conform with those contained in the
Master Shelf Agreement, as restated and amended.

1995 Senior Notes.  The Company sold $42 million of 1995 Senior Notes to a group
of insurance companies in the fourth quarter of 1995, with an interest rate of
8.16% per annum and principal due in a single payment in December 2005. The 1995
Senior Notes contain certain financial covenants that conform with those
contained in the Master Shelf Agreement, as restated and amended. The Company
used the net proceeds from the sale to reduce borrowings under the Revolving
Credit Facility.

Receivables Facility.  In April 1995, the Company entered into an agreement with
Receivables Capital Corporation ("RCC"), as purchaser, and Bank of America
National Trust and Savings Association ("BA"), as agent, pursuant to which the
Company will sell to RCC at face value on a revolving basis an undivided
interest in certain of the Company's trade receivables. As part of the sale, the
Company granted to RCC a security interest in such receivables. The Company may
sell up to $75 million of trade receivables under the Receivables Facility, at a
rate equal to RCC's commercial paper rate plus .375%, of which $75 million was
funded at a rate of 6.3% as of December 31, 1995. The Receivables Facility has a
364-day term and contains financial covenants similar to those in the Credit
Facilities Agreement, as restated and amended, along with certain covenants
regarding the quality of the trade receivables pool.

On September 2, 1994, in anticipation of entering into the Receivables Facility,
BA entered in a Master Note Agreement (the "Short-Term Note") with the Company
and advanced the Company $75 million at the Eurodollar rate plus .50%, which
resulted in an interest rate of 6.56% per annum at June 30, 1995. The Company
used the $75 million drawn on the Receivables Facility to repay the Short-Term
Note, which was then canceled.

COVENANT COMPLIANCE.  At December 31, 1995, the Company was in compliance with
all covenants in its loan agreements.

INTEREST RATE SWAP AGREEMENTS.  Historically, the Company has entered into
interest rate swap agreements to manage exposure to changes in interest rates.
The transactions generally involve the exchange of fixed and floating interest
payment obligations or the exchange of foreign and U.S. currencies, without the
exchange of the underlying principal amounts. The net effect of interest

                                       20
<PAGE>
 
rate swap activity is reflected as an increase or decrease in interest expense.
Any gains on termination of interest rate swap agreements and the effects of
foreign currency positions that were marked to market are included in other
income. At December 31, 1995 and 1994, the total notional principal amount of
outstanding interest rate swap agreements was $0 and $50 million, respectively.
In addition to the financial risk, which will vary during the life of these swap
agreements in relation to the maturity of the underlying debt and market
interest rates, the Company is subject to credit risk exposure from
nonperformance of the counterparties to the swap agreements.

In anticipation of issuing the 1995 Senior Notes in the fourth quarter of 1995,
the Company entered into an interest rate lock on a notional amount of $50
million, linked to the ten-year U.S. Treasury Bill rate, with a creditworthy
counterparty to hedge against the risk of rising interest rates while it
completed the 1995 Senior Notes placement. At the time the Company terminated
the rate lock, interest rates had decreased, which resulted in the realization
of a $390,000 loss. The Company considered the loss to be a cost of obtaining
the privately placed debt and is therefore amortizing it over the ten-year term
of the 1995 Senior Notes.

The following table summarizes the results of the Company's interest rate swap
and foreign currency positions for each of the three years in the period ended
December 31, 1995 (000s):

<TABLE>
<CAPTION>
                                                        1995                 1994              1993
                                                        -----               ------            -------
<S>                                                     <C>                 <C>               <C>
                                                                                   
Net (increase) decrease to interest expense...........  $ 358               $ (932)            $ 1,769
                                                        =====               ======             =======
                                                                                   
Interest rate swap losses capitalized.................  $ 390               $    -             $     -
                                                        =====               ======             =======
                                                                                   
Gains on swap termination.............................  $   -               $    -             $ 2,590
                                                        =====               ======             =======
                                                                                   
Losses on foreign currency positions..................  $   -               $ (361)            $(1,175)
                                                        =====               ======             =======
</TABLE>

     Environmental

The construction and operation of the Company's gathering lines, plants and
other facilities used for the gathering, transporting, processing, treating or
storing of residue gas and NGLs are subject to federal, state and local
environmental laws and regulations, including those that can impose obligations
to clean up hazardous substances at the Company's facilities or at facilities to
which the Company sends wastes for disposal. In most instances, the applicable
regulatory requirements relate to water and air pollution control or solid waste
management procedures. The Company employs six environmental engineers to
monitor environmental compliance and potential liabilities at its facilities.
Prior to consummating any major acquisition, the Company's environmental
engineers perform audits on the facilities to be acquired. In addition, on an
ongoing basis, the environmental engineers perform systematic environmental
assessments of the Company's existing facilities. The Company believes that it
is in substantial compliance with applicable material environmental laws and
regulations. Environmental regulation can increase the cost of planning,
designing, constructing and operating the Company's facilities. The Company
believes that the costs for compliance with current environmental laws and
regulations have not had and will not have a material effect on the Company's
financial position or results of operation.

In 1990, the Congress enacted the Clean Air Act Amendments of 1990 (the "Clean
Air Act") which impose more stringent standards on emissions of certain
pollutants and require the permitting of certain existing air emissions sources.
Many of the regulations have not yet been promulgated and until their
promulgation, the Company cannot make a final assessment of the impact of the
Clean Air Act. However, based upon its preliminary review of the proposed
regulations, the Company does not anticipate that compliance with the Clean Air
Act will require any material capital expenditures, although it will increase
permitting costs in 1996 and may increase certain operating costs on an ongoing
basis. The Company does not believe that such cost increases will have a
material effect on the Company's financial position or results of operations.

The Company believes that it is reasonably likely that the trend in
environmental legislation and regulation will continue to be towards stricter
standards. The Company is unaware of future environmental standards that are
reasonably likely to be adopted that will have a material effect on the
Company's financial position or results of operations, but it cannot rule out
that possibility.

The Company is in the process of voluntarily cleaning up substances at
facilities that it operates. In addition, the former owner of certain facilities
that the Company acquired in 1992 is conducting remediation at those facilities
pursuant to contractual obligations. The Company's expenditures for
environmental evaluation and remediation at existing facilities have not been

                                       21
<PAGE>
 
significant in relation to the results of operations of the Company and totaled
approximately $1.3 million for the year ended December 31, 1995. For the year
ended December 31, 1995, the Company paid an aggregate of approximately $757,000
in air emissions fees to the states in which it operates. Although the Company
anticipates that such environmental expenses will increase over time, the
Company does not believe that such increases will have a material effect on the
Company's financial position or results of operations.

FORWARD LOOKING INFORMATION

The Company has developed a three-part business plan to increase profitability
through continued growth of the Company's core businesses. The Company plans to
expand its marketing activities, acquire or develop gas gathering and processing
assets that meet the Company's target rates of return and increase the
efficiency of its existing facilities.

     Marketing

The Company's existing natural gas and NGL marketing was a by-product of the
Company's processing activities and was directed towards selling natural gas and
NGLs processed at its plants to ensure their efficient operation. As the Company
expanded into new basins and the natural gas industry became deregulated, the
Company began to increase its third-party marketing. The Company believes that
the knowledge and understanding gained through its gas gathering and processing
operations coupled with its understanding of the pipeline network are the basis
for its success in marketing natural gas and NGLs. Average daily gas sales
increased to 1,572 MMcf per day and NGL sales increased to 2,890 MGal per day
for the year ended December 31, 1995 compared to 220 MMcf and 630 MGal,
respectively, for the year ended December 31, 1990, a 615% and 359% increase,
respectively.

     Natural Gas

The Company plans to expand its gas marketing by (i) targeting special needs of
end-users willing to pay higher margins, (ii) increasing its use of the Katy
Facility and (iii) entering the recently deregulated electric power marketing
sector. The Company's marketing department has recently been restructured along
more specialized lines to include separate managers for national accounts, end-
use sales and electric power marketing. In 1996, the Company plans to hire four
experienced marketers who will primarily be involved in seeking national
accounts with companies having multiple facilities throughout the country. There
is no assurance that the Company will be successful in obtaining such accounts.
The Company has also expanded its marketing activity to areas beyond its
traditional gas supply centers (Houston and the Gulf Coast) to demand centers,
such as Chicago, New York and California.

The Katy Facility, which commenced operations in February 1994, utilizes a
partially depleted natural gas reservoir with 19 Bcf of working gas capacity and
a pipeline header system, currently connected to eleven pipelines. The Katy
Facility has the capability to deliver up to 400 MMcf per day of natural gas
from the reservoir. In the first two years of the facility's operation, the
Company used a majority of the storage for its own account to take advantage of
the price differential between summer and winter gas. As part of its marketing
plans, the Company intends to increase its long-term firm storage agreements
with local distribution companies from 45% to up to 75% of the available 
capacity.

     NGLs

The Company's plans for NGL marketing are focused on increasing third-party
sales. The Company is also pursuing industrial end-users of NGLs and recently
entered into a long-term agreement for the sale of approximately two-thirds of
the propane produced at the Granger Plant to a mining company through a
transporter/wholesaler. In addition, the Company plans to spend approximately $5
million in 1996 to upgrade certain processing facilities which will allow for
production of higher-value NGLs. For example, the Company is installing a butane
splitter at the Granger Plant which will permit fractionation of field-grade
butane into normal butane and iso-butane, products that receive a premium over
the field-grade butane.

     Electric Power

The Company believes that the anticipated deregulation by states of retail power
marketing will offer the Company significant opportunities to offer both natural
gas and electric power to its existing end-user customer base and to utilize the
Company's demonstrated ability in the natural gas sector to respond quickly to
changing regulatory and market conditions. In 1994, the Company received a
certificate from the FERC to sell electric power at the wholesale level. The
Company intends to dedicate six employees to power marketing by the end of 1996.
The Company is in the process of developing the contractual infrastructure

                                       22
<PAGE>
 
necessary to market power and has already put into place 150 blanket
transmission agreements with carriers and 150 tolling agreements with power
generators to trade natural gas for electric power. There is no assurance that
the retail electric power marketing industry will develop or that the Company
will be successful if the industry develops.

     Business Development

The Company's business development activities are oriented towards (i)
identifying and acquiring gas gathering and processing assets and (ii) obtaining
additional gas supplies to maintain or increase throughput levels at the
Company's existing facilities to offset natural production declines.

Historically, the Company has expanded primarily through acquisitions. Since
December 31, 1990, the Company has had a net increase of 13 gas processing
plants and has increased its gas gathering system miles by 188% to 11,079 miles,
resulting in an increase in gas throughput of 370% for the five-year period
ended December 31, 1995. As part of its business plan, the Company will continue
to pursue aggressively gas gathering and processing assets which meet the
Company's target rate of return, with an emphasis on acquisitions that
complement its existing operations or provide growth in marketing.

The Company's business plan assumes that the Company will spend $50 million in
each of 1996, 1997 and 1998 on acquisitions and projects that complement its
current asset base. One of the significant criteria for the Company in making
acquisitions or entering into development projects is that such transactions
have a projected internal rate of return of 20% per year, before income taxes
and financing costs, for a 15-year period, although the Company will also
consider lower return transactions if they provide other opportunities or
benefits. The primary factor affecting internal rates of return is the price of
natural gas, which also generally affects the volumes of natural gas produced by
both the Company and third parties. Other assumptions underlying the Company's
business plan are that for every $1 million in investment, the Company will (i)
spend an additional $100,000 in each succeeding year for new well connects and
related expansion (an aggregate of $5 million per year if the full $50 million
is spent) and (ii) incur an additional $10,000 in general and administrative
costs.

The Company believes that the foregoing criteria and assumptions are reasonable
under current industry and general economic and market conditions. However, the
Company cannot predict the volumes and prices of natural gas and NGLs, and
actual industry and general economic and market conditions could differ, perhaps
significantly, from the conditions that the Company has assumed in projecting
rates of return for transactions. Furthermore, there can be no assurance that
the Company will identify any qualifying transactions or that it will ultimately
be able to acquire assets or enter into such projects.

     Operations

The Company continually monitors the economic performance of each of its
operating facilities to ensure that it meets a desired cash flow objective. If
an operating facility is not generating desired cash flows or does not fit in
with the Company's strategic plans, the Company will explore various options,
such as consolidation with other Company-owned facilities, dismantlement, asset
swap or outright sale. In 1995, the Company sold the Waha Header and certain 
non-strategic assets acquired in the Oasis acquisition and completed the
consolidation of its Lamont gathering system with the Chaney Dell system. The
Company anticipates completing the salvage of substantially all of the Lamont
processing plant by the end of the first quarter of 1996. In 1994, the Company
sold its Sligo plant, swapped its Pyote treating facilities for gathering assets
in Kansas which were subsequently disposed of during the second quarter of 1995,
consolidated assets in the Powder River Basin and sold its Walnut Bend gathering
system. The Company anticipates that the salvage of the Walnut Bend processing
plant will be substantially completed by the end of the third quarter of 1996.
Commencing in March 1996, the Company and its joint venture partner at the
Lincoln Road gas plant temporarily suspended processing operations at that plant
and began processing the associated gas at the Company's Granger facility. If
volumes increase substantially beyond Granger's capacity, the Lincoln Road plant
might be re-started. The Company anticipates that this consolidation will result
in lower overall plant operating expenses for the combined systems. In January
1996, Koch, which operates the Teddy Roosevelt and Williston assets under a
lease agreement, exercised its option to purchase certain gas gathering assets
located in North Dakota from the Company and Williston. Proceeds from the sale
of the gathering assets totaled $2.4 million of which the Company is entitled to
receive $1.5 million. The closing on the sale is expected to occur on August 1,
1996, at which time the operations of Williston and the Company's Teddy
Roosevelt facility will cease and any remaining assets will be salvaged.

                                       23
<PAGE>
 
     Hedging

In order to reduce the impact of commodity price fluctuations on  its operating
results, the Company enters into futures contracts and basis positions to hedge
the majority of its natural gas equity production. The following table
summarizes the Company's hedged equity position as of March 1, 1996:

<TABLE>
<CAPTION>
                                 Average Daily Volumes (MMcf/D)                   Weighted Average Price
                            ---------------------------------------      ---------------------------------------
                             First     Second     Third      Fourth       First     Second     Third     Fourth
           Basin            Quarter   Quarter    Quarter    Quarter      Quarter    Quarter    Quarter   Quarter
- --------------------------  -------   -------    -------    -------      -------    -------    -------   -------
                                                                                                       
<S>                         <C>       <C>        <C>        <C>          <C>        <C>        <C>       <C>
Permian                      20,000    15,000     15,000     15,000       $ 1.76     $1.81      $1.81     $1.88
Rocky Mountain                3,407         -          -          -         1.37         -          -         -
Gulf Coast                   19,121    15,495     14,891     11,630         2.23      1.86       1.81      1.93
Mid-Continent                 1,758     5,000      5,000     14,783       $ 1.85     $1.84      $1.85     $1.80
</TABLE>

From time to time, the Company also hedges a portion of its share of condensate
and crude oil production, although no such hedges were outstanding at December
31, 1995. The Company will continue hedging such production as deemed
appropriate by management.

                                       24
<PAGE>
 
ITEM 8.  FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

                   Index to Consolidated Financial Statements

Western Gas Resources, Inc.'s Consolidated Financial Statements as of December
31, 1995 and 1994 and for each of the three years in the period ended December
31, 1995:

<TABLE>
<CAPTION>
                                                                                      Page
                                                                                      ----
<S>                                                                                   <C>
Report of Management................................................................    26
Report of Independent Accountants...................................................    27
Consolidated Balance Sheets.........................................................    28
Consolidated Statements of Cash Flows...............................................    29
Consolidated Statements of Operations...............................................    30
Consolidated Statements of Changes in Stockholders' Equity..........................    31
Notes to Consolidated Financial Statements..........................................    32
</TABLE>

                                       25
<PAGE>
 
                              REPORT OF MANAGEMENT

The financial statements and other financial information included in this Annual
Report on Form 10-K are the responsibility of management.  The financial
statements have been prepared in conformity with generally accepted accounting
principles appropriate in the circumstances and include amounts that are based
on management's informed judgments and estimates.

Management relies on the Company's system of internal accounting controls to
provide reasonable assurance that assets are safeguarded and that transactions
are properly recorded and executed in accordance with management's
authorization.  The concept of reasonable assurance is based on the recognition
that there are inherent limitations in all systems of internal accounting
control and that the cost of such systems should not exceed the benefits to be
derived.  The internal accounting controls, including internal audit, in place
during the periods presented are considered adequate to provide such assurance.

The Company's financial statements are audited by Price Waterhouse LLP,
independent accountants.  Their report states that they have conducted their
audit in accordance with generally accepted auditing standards.  These standards
include an evaluation of the system of internal accounting controls for the
purpose of establishing the scope of audit testing necessary to allow them to
render an independent professional opinion on the fairness of the Company's
financial statements.

Oversight of Management's financial reporting and internal accounting control
responsibilities is exercised by the Board of Directors, through an Audit
Committee that consists solely of outside directors.  The Audit Committee meets
periodically with financial management, internal auditors and the independent
accountants to review how each is carrying out its responsibilities and to
discuss matters concerning auditing, internal accounting control and financial
reporting.  The independent accountants and the Company's internal audit
department have free access to meet with the Audit Committee without Management
present.


<TABLE> 
<CAPTION> 
Signature                                              Title
- ---------                                              -----
                        
<S>                                                <C>                         
/s/ BILL M. SANDERSON   
- -----------------------------------   
Bill M. Sanderson                                  President, Chief Operating Officer and Director
                        
                        
/s/ WILLIAM J. KRYSIAK  
- -----------------------------------  
William J. Krysiak                                 Vice President - Finance (Principal Financial and
</TABLE> 
                                                   Accounting Officer)

                                       26
<PAGE>
 
                       REPORT OF INDEPENDENT ACCOUNTANTS
                       ---------------------------------



To the Board of Directors and
Stockholders of Western Gas Resources, Inc.

In our opinion, the accompanying consolidated balance sheet and the related
consolidated statements of cash flows, of operations, and of changes in
stockholders' equity present fairly, in all material respects, the financial
position of Western Gas Resources, Inc. and its subsidiaries at December 31,
1995 and 1994, and the results of their cash flows and their operations for each
of the three years in the period ended December 31, 1995, in conformity with
generally accepted accounting principles.  These financial statements are the
responsibility of the Company's management; our responsibility is to express an
opinion on these financial statements based on our audits.  We conducted our
audits of these statements in accordance with generally accepted auditing
standards which require that we plan and perform the audit to obtain reasonable
assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements, assessing the
accounting principles used and significant estimates made by management, and
evaluating the overall financial statement presentation.  We believe that our
audits provide a reasonable basis for the opinion expressed above.

As discussed in Notes 2 and 3 to the financial statements, the Company changed
its method of accounting for the impairment of long-lived assets in 1995 to
comply with the provisions of Statement of Financial Accounting Standards No.
121.



PRICE WATERHOUSE LLP

Denver, Colorado
February 23, 1996

                                       27
<PAGE>
 
                          WESTERN GAS RESOURCES, INC.
                           CONSOLIDATED BALANCE SHEET
                                     (000s)
<TABLE>
<CAPTION>
 
                                                                                                December 31,
                                                                                      ------------------------------
     ASSETS                                                                               1995               1994
     ------                                                                           -----------        -----------
<S>                                                                                   <C>                <C>
Current assets:                                                                                   
   Cash and cash equivalents....................................................       $    5,795         $    8,708
   Trade accounts receivable, net...............................................          204,426            134,444
   Product inventory............................................................           28,154             51,139
   Parts inventory..............................................................            2,427              2,291
   Other........................................................................            1,524              1,367
                                                                                       ----------         ----------
      Total current assets......................................................          242,326            197,949
                                                                                       ----------         ----------
Property and equipment:                                                                           
   Gas gathering, processing, storage and transmission..........................          882,801            881,569
   Oil and gas properties and equipment.........................................          140,691            140,601
   Construction in progress.....................................................           26,314             40,076
                                                                                       ----------         ----------
                                                                                        1,049,806          1,062,246
 Less:  Accumulated depreciation, depletion and amortization....................         (200,203)          (179,537)
                                                                                       ----------         ----------

      Total property and equipment, net.........................................          849,603            882,709
                                                                                       ----------         ----------
Other assets:                                                                                     
   Gas purchase contracts (net of accumulated amortization of $19,273 and                         
      $14,872, respectively)....................................................           54,637             40,958
   Other........................................................................           47,431             45,746
                                                                                       ----------         ----------

      Total other assets........................................................          102,068             86,704
                                                                                       ----------         ----------

Total assets....................................................................       $1,193,997         $1,167,362
                                                                                       ==========         ==========
     LIABILITIES AND STOCKHOLDERS' EQUITY                                                              
     ------------------------------------                  
Current liabilities:                                                                              
   Accounts payable.............................................................       $  199,513         $  145,244
   Short-term debt..............................................................           75,000             75,000
   Accrued expenses.............................................................           19,204             13,448
   Dividends payable............................................................            3,898              3,895
   Income taxes payable.........................................................                -                843
                                                                                       ----------         ----------

      Total current liabilities.................................................          297,615            238,430

Long-term debt..................................................................          454,500            418,000
Deferred income taxes payable...................................................           69,973             68,727
Other long-term liabilities.....................................................                -              5,522
                                                                                       ----------         ----------

      Total liabilities.........................................................          822,088            730,679
                                                                                       ----------         ----------
Commitments and contingent liabilities..........................................                -                  -
Stockholders' equity:                                                                             
   Preferred Stock; 10,000,000 shares authorized:                                                 
      7.25% cumulative senior perpetual convertible preferred stock, par value                     
         $.10; none and 400,000 shares issued and outstanding ($40,000                                  
         aggregate liquidation preference)......................................                -                 40
      $2.28 cumulative preferred stock, par value $.10; 1,400,000 shares issued                         
         and outstanding ($35,000 aggregate liquidation preference).............              140                140
      $2.625 cumulative convertible preferred stock, par value $.10; 2,760,000                       
         and issued and outstanding, respectively ($138,000 aggregate                               
          liquidation preference)...............................................              276                276
   Common stock, par value $.10; 100,000,000 shares authorized; 25,794,728 and                    
      25,737,317 shares issued, respectively....................................            2,580              2,574
   Treasury stock, at cost; 25,016 shares in treasury...........................             (788)              (788)
   Additional paid-in capital...................................................          301,234            338,926
   Retained earnings............................................................           70,348             97,040
   Notes receivable from key employees secured by common stock..................           (1,881)            (1,525)
                                                                                       ----------         ----------

      Total stockholders' equity                                                          371,909            436,683
                                                                                       ----------         ----------

Total liabilities and stockholders' equity......................................       $1,193,997         $1,167,362
                                                                                       ==========         ==========
</TABLE>
   The accompanying notes are an integral part of the consolidated financial
                                  statements.

                                       28
<PAGE>
 
                          WESTERN GAS RESOURCES, INC.
                      CONSOLIDATED STATEMENT OF CASH FLOWS
                                     (000s)

<TABLE>
<CAPTION>
                                                                                               Year Ended December 31,             
                                                                                        --------------------------------------     
                                                                                           1995            1994          1993   
                                                                                        ----------     -----------   ---------     
<S>                                                                                     <C>            <C>           <C>        
Reconciliation of net income to net cash provided by operating activities
- -------------------------------------------------------------------------
Net income (loss)................................................................       $  (6,108)     $   7,364     $  38,102   
Add income items that do not affect working capital:            
  Depreciation, depletion and amortization.......................................          65,361         63,586        43,980 
  Deferred income taxes..........................................................           1,246          2,246         7,439 
  Gain on the sale of property and equipment.....................................            (939)             -             -   
  Loss on the impairment of long-lived assets....................................          17,642              -             -  
  Other non-cash items...........................................................          (1,360)           452            77 
                                                                                       ----------      ---------     ---------
                                                                                           75,842         73,648        89,598 
                                                                                       ----------      ---------     ---------     
Adjustments to working capital to arrive at net cash provided by  
  operating activities:                                                                                                            
  (Increase) decrease in trade accounts receivable...............................         (69,982)         7,892       (38,078)
  (Increase) decrease in product inventory.......................................          22,985        (30,289)       (2,540)  
  Increase in parts inventory....................................................            (136)          (130)         (490) 
  (Increase) decrease in other current assets....................................            (157)           177            56   
  Increase in other assets and liabilities, net..................................            (391)          (241)       (2,845) 
  Increase (decrease) in accounts payable........................................          54,269        (15,712)       68,813 
  Increase (decrease) in accrued expenses........................................           4,786         (4,322)       (7,398) 
  Increase (decrease) in income taxes payable....................................            (843)           843             - 
                                                                                      -----------      ---------     ---------
   Total adjustments.............................................................          10,531        (41,782)       17,518 
                                                                                      -----------       ---------    ---------  
Net cash provided by operating activities........................................          86,373         31,866       107,116  
                                                                                      -----------      ---------     --------- 
                                                                                                                                   
Cash flows from investing activities:                        
  Payments for business acquisitions.............................................          (8,109)       (24,685)     (302,988)
  Payments for additions to property and equipment...............................         (48,029)       (67,148)     (150,216) 
  Proceeds from the disposition of property and equipment........................          13,328         10,897           741
  Contributions to investments for capital expenditures..........................          (4,237)        (1,189)      (11,647)  
  Gas purchase contracts acquired................................................         (18,146)        (7,518)      (27,477)  
                                                                                        ---------      ---------     --------- 
Net cash used in investing activities............................................         (65,193)       (89,643)     (491,587)
                                                                                        ---------       ---------    --------- 
                                                                                                                                   
Cash flows from financing activities:                           
  Net proceeds from issuance of preferred stock..................................               -        132,676             -   
  Net proceeds from exercise of common stock options.............................             117            413           372 
  Debt issue costs paid..........................................................          (1,884)          (827)       (3,611) 
  Proceeds from short-term borrowings............................................               -         75,000             -  
  Proceeds from issuance of long-term debt.......................................          92,000         50,000       100,000  
  Payments on long-term debt.....................................................         (25,000)             -             -  
  Borrowings under revolving credit facility.....................................         625,400        347,400       594,350 
  Payments on revolving credit facility..........................................        (655,900)      (526,400)     (304,350)
  Dividends paid to holders of common stock......................................          (5,153)        (5,140)       (5,124) 
  Dividends paid to holders of preferred stock...................................         (11,643)       (11,303)       (5,660)  
  Redemption of 7.25% Cumulative Senior Perpetual Convertible Preferred                  
   Stock.........................................................................         (42,030)             -             - 
                                                                                        ---------      ---------     --------- 
  Net cash provided by (used in) financing activities............................         (24,093)        61,819       375,977  
                                                                                        ---------      ---------     ---------
Net increase (decrease) in cash..................................................          (2,913)         4,042        (8,494)
Cash and cash equivalents at beginning of period.................................           8,708          4,666        13,160 
                                                                                        ---------      ---------     --------- 
Cash and cash equivalents at end of period.......................................       $   5,795      $   8,708     $   4,666 
                                                                                        =========      =========     =========  
</TABLE>

   The accompanying notes are an integral part of the consolidated financial
                                  statements.

                                       29
<PAGE>
 
                          WESTERN GAS RESOURCES, INC.
                      CONSOLIDATED STATEMENT OF OPERATIONS
                   (000s, except share and per share amounts)

<TABLE>
<CAPTION>
                                                                                        Year Ended December 31,            
                                                                           ----------------------------------------------  
                                                                             1995                1994            1993      
                                                                           ------------     -----------      ------------  
<S>                                                                        <C>              <C>              <C>           
Revenues:                                                                                                                  
   Sale of residue gas................................................     $   876,399      $   707,869      $    563,068 
   Sale of natural gas liquids........................................         331,760          309,358           333,880 
   Processing, transportation and storage revenue.....................          41,358           35,057            25,622 
   Other, net.........................................................           7,467           11,205             9,768 
                                                                           -----------      -----------      ------------

       Total revenues.................................................       1,256,984        1,063,489           932,338 
                                                                           -----------      -----------      ------------
Costs and expenses:                                                                                                        
   Product purchases..................................................       1,040,265          853,398           730,676   
   Plant operating expense............................................          71,030           68,500            62,387   
   Oil and gas exploration and production cost........................           5,117            5,449             3,283   
   Selling and administrative expense.................................          26,610           29,598            23,925   
   Depreciation, depletion and amortization...........................          65,361           63,586            43,980   
   Interest expense...................................................          37,160           31,434            12,456   
   Restructuring charge...............................................           2,065                -                 -   
   Loss on the impairment of long-lived assets........................          17,642                -                 -   
                                                                           -----------      -----------      ------------  

       Total costs and expenses.......................................       1,265,250        1,051,965           876,707  
                                                                           -----------      -----------      ------------  
                                                                                                                           
Income (loss) before taxes............................................          (8,266)          11,524            55,631  
                                                                                                                           
Provision (benefit) for income taxes:                                                                                      
   Current............................................................          (3,404)           1,913            10,090  
   Deferred...........................................................           1,246            2,247             7,439   
                                                                           -----------      -----------      ------------  

      Total provision (benefit) for income taxes......................          (2,158)           4,160            17,529   
                                                                           -----------      -----------      ------------  
                                                                                                                           
Net income (loss).....................................................          (6,108)           7,364            38,102   
                                                                                                                           
Preferred stock requirements..........................................         (15,431)         (12,212)           (6,092)  
                                                                           -----------      -----------      ------------   
                                                                                                                           
Income (loss) attributable to common stock............................     $   (21,539)     $    (4,848)     $     32,010   
                                                                           ===========      ===========      ============  
Earnings (loss) per share of common stock.............................           $(.84)     $      (.19)     $       1.25   
                                                                           ===========      ===========      ============ 
                                                                                                                           
Weighted average shares of common stock outstanding...................      25,753,738       25,695,760        25,608,503    
                                                                           ===========      ===========      ============    
</TABLE>                             

  The accompanying notes are an integral part of the consolidated financial 
                                  statements.

                                       30
<PAGE>
 
                          WESTERN GAS RESOURCES, INC.
           CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY
                          (000s, except share amounts)
<TABLE>
<CAPTION>
 
 
                              Shares of                                                                                      
                                7.25%                                                              7.25%    
                              Cumulative                   Shares of                             Cumulative 
                               Senior        Shares of      $2.625                                 Senior               
                              Perpetual       $2.28        Cumulative                 Shares     Perpetual       $2.28  
                             Convertible    Cumulative    Convertible     Shares    of Common    Convertible   Cumulative
                              Preferred     Preferred      Preferred    of Common     Stock       Preferred    Preferred      
                                Stock         Stock          Stock        Stock     in Treasury     Stock        Stock       
                             ----------     ---------     -----------  -----------  -----------  ----------   ----------   
<S>                          <C>            <C>           <C>          <C>          <C>         <C>           <C>          
Balance at December 31,                                                                                                 
 1992......................    400,000      1,400,000              -   25,522,575           -   $      40     $     140
Net income, 1993...........          -              -              -            -           -           -             - 
Stock options exercised....          -              -              -      129,147           -           -             - 
Dividends declared on                                                                                                   
 common stock..............          -              -              -            -           -           -             - 
Dividends declared on                                                                                                   
 7.25% cumulative..........                                                                                             
 senior perpetual                                                                                                                
 convertible preferred                                                                                                  
 stock.....................          -              -              -            -           -           -             -      
Dividends declared on                                                                                                   
 $2.28 cumulative..........
preferred  stock...........          -              -              -            -           -           -             - 
                             ---------      ---------     ----------  -----------   ---------  ----------   ----------- 
Balance at December 31,                                                                                                 
 1993......................    400,000      1,400,000              -   25,651,722           -          40           140 
Net income, 1994...........          -              -              -            -           -           -             - 
Stock options exercised....          -              -              -       85,595           -           -             - 
Treasury stock, at cost....          -              -              -      (25,016)     25,016           -             - 
Proceeds from issuance of                                                                                               
 $2.625 cumulative.........                                                                                             
 convertible preferred stock         -              -      2,760,000            -           -           -             -          
Dividends declared on                                                                                                   
 common stock..............          -              -              -            -           -           -             - 
Dividends declared on                                                                                                   
 7.25% cumulative..........                                                                                             
 senior perpetual
 convertible preferred                                                                                                  
 stock.....................          -              -              -            -           -           -             -
Dividends declared on                                                                                              
 $2.28 cumulative..........                                                                                        
 preferred stock...........          -              -              -            -           -           -             -  
Dividends declared on                                                                                                   
 $2.625 cumulative.........                                                                                             
 convertible preferred stock         -              -              -            -           -           -             -    
                             ---------      ---------     ----------  -----------   ---------  ----------   ----------- 
                                                                                                                        
Balance at December 31,                                                                                                 
 1994......................    400,000      1,400,000      2,760,000   25,712,301      25,016          40           140 
Net loss, 1995.............          -              -              -            -           -           -             - 
Stock options exercised....          -              -              -       57,411           -           -             - 
Redemption of 7.25%                                                                                                     
 cumulative senior.........   (400,000)             -              -            -           -         (40)            -   
 perpetual convertible                                                                                                             
 preferred stock...........          -              -              -            -           -           -             -    
Dividends declared on                                                                                                   
 common stock..............          -              -              -            -           -           -             - 
Dividends declared on                                                                                                   
 7.25% cumulative senior                                                                                                
 perpetual convertible                                                                                                  
 preferred stock...........          -              -              -            -           -           -             -     
Dividends declared on    
 $2.28 cumulative..........                                                                                             
 preferred stock...........          -              -              -            -           -           -             - 
Dividends declared on                                                                                                   
 $2.625 cumulative.........                                                                                             
 convertible preferred stock         -              -              -            -           -           -             -    
                             ---------      ---------     ----------  -----------   ---------  ----------   ----------- 
                                                                                                                        
Balance at December 31,                                                                                                 
 1995......................          -      1,400,000      2,760,000   25,769,712      25,016   $       -   $       140 
                             =========      =========     ==========  ===========   =========  ==========   =========== 
<CAPTION>                                                
                             
                               $2,625                                                        
                             Cumulative                                                        Notes        Total  
                             Convertible                            Additional               Receivable     Stock- 
                              Preferred      Common     Treasury     Paid-In     Retained     from Key     holders'            
                                Stock         Stock       Stock      Capital     Earnings    Employees      Equity             
                            -----------      ------     ---------   ----------   ---------   ----------   ---------         
                            <C>              <C>        <C>         <C>          <C>         <C>          <C>     
Balance at December 31,                                                                                          
 1992......................           -     $  2,552        -   $  204,720   $  81,047    $  (1,478)   $  287,021
Net income, 1993...........           -            -        -            -      38,102            -        38,102
Stock options exercised....           -           13        -          974           -         (507)          480
Dividends declared on                                                                                            
 common stock..............           -            -        -            -      (5,124)           -        (5,124)
Dividends declared on                                                                                            
 7.25% cumulative..........                                                                                      
 senior perpetual                                                                                                         
 convertible preferred                                                                                           
 stock.....................           -            -        -            -      (2,900)           -        (2,900)
Dividends declared on                                                                                            
 $2.28 cumulative..........                                                                                      
                                                                                                        
 preferred stock...........           -            -        -            -      (3,192)           -        (3,192)
                             ----------   ----------  -------   ----------    --------   ----------      --------
Balance at December 31,                                                                                          
 1993......................           -        2,565        -      205,694     107,933       (1,985)      314,387
Net income, 1994...........           -            -        -            -       7,364            -         7,364
Stock options exercised....           -            9        -          831           -         (328)          512
Treasury stock, at cost....           -            -     (788)           -           -          788             -
Proceeds from issuance of                                                                                        
 $2.625 cumulative                  
 convertible preferred stock        276            -        -      132,401           -            -       132,677
Dividends declared on                                                                                            
 common stock..............           -            -        -            -      (5,140)           -        (5,140)
Dividends declared on                                                                                            
 7.25% cumulative..........                                                                                     
 senior perpetual                                                                                                     
 convertible preferred                                                                                           
 stock.....................           -            -        -            -      (2,900)           -        (2,900)
Dividends declared on                                                                                            
 $2.28 cumulative..........                                                                                      
 preferred stock...........           -            -        -            -      (3,192)           -        (3,192)
Dividends declared on                                                                                           
 $2.625 cumulative.........                                                                                     
 convertible preferred stock          -            -        -            -      (7,025)           -        (7,025)
                             ----------   ----------  -------   ----------    --------   ----------      --------
                                                                                                                 
Balance at December 31,                                                                                         
 1994......................         276        2,574     (788)     338,926      97,040       (1,525)     (436,683)
Net loss, 1995.............           -            -        -            -      (6,108)           -        (6,108)
Stock options exercised....           -            6        -          514           -         (356)          164
Redemption of 7.25%                                                                                               
 cumulative senior.........                                                                                      
 perpetual convertible                                                                                                      
 preferred stock...........           -            -        -     (38,206)      (3,784)           -       (42,030)
Dividends declared on                                                                                           
 common stock..............           -            -        -           -       (5,153)           -        (5,153)
Dividends declared on                                                                                           
 7.25% cumulative..........                                                                                     
 senior perpetual                                                                                                         
 convertible preferred                                                                                           
 stock.....................           -            -        -           -       (1,208)           -        (1,208)
Dividends declared on                                                                                            
 $2.28 cumulative..........                                                                                     
 preferred stock...........           -            -        -           -       (3,194)           -        (3,194)
Dividends declared on                                                                                           
 $2.625 cumulative.........                                                                                        
 convertible preferred stock          -            -        -           -       (7,245)           -        (7,245)
                             ----------   ----------  -------  -----------    ---------   ----------     ---------     
                                                                                                                   
Balance at December 31,                                                                                      
 1995......................  $      276   $    2,580  $  (788) $  301,234     $ 70,348    $  (1,881)     $371,909 
                             ==========   ==========  =======  ==========     ========    =========      ======== 
</TABLE> 

The accompanying notes are an integral part of the consolidated financial 
statements.
                             
                                       31
<PAGE>
 
                          WESTERN GAS RESOURCES, INC.
                  NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


NOTE 1 -- NATURE OF ORGANIZATION
- ------------------------------

Western Gas Resources, Inc., a Delaware corporation, is an independent gas
gatherer, processor and marketer with operations in major oil and gas-producing
basins in the Rocky Mountain, Gulf Coast and Southwestern regions of the United
States, Western Gas Resources, Inc. owns and operates natural gas gathering,
processing and storage facilities and markets and transports natural gas and
natural gas liquids ("NGLs").

Western Gas Resources, Inc, was formed in October 1989 to acquire a majority
interest in Western Gas Processors, Ltd. (the "Partnership") and to assume the
duties of WGP Company, the general partner of the Partnership. The Partnership
had been a Colorado limited partnership formed in 1977 to engage in the
gathering and processing of natural gas. The reorganization was accomplished in
December 1989 through an exchange for common stock of partnership units held by
the former general partners of WGP Company (the "Principal Stockholders") and an
initial public offering of Western Gas Resources, Inc. common stock. On May 1,
1991, a further restructuring ("Restructuring") of the Partnership and Western
Gas Resources, Inc. (together with its predecessor, WGP Company, collectively,
the "Company") was approved by a vote of the security holders. The combinations
were reorganizations of entities under common control and have been accounted
for at historical cost in a manner similar to poolings of interests.

In October 1991, the Company issued 400,000 shares of 7.25% Cumulative Senior
Perpetual Convertible Preferred Stock ("7.25% Preferred Stock") with a
liquidation preference of $100 per share to an institutional investor. In May
1995, the Company redeemed all of the issued and outstanding shares of its 7.25%
Preferred Stock pursuant to the provisions its Certificate of Designation
relating to such preferred stock, at an aggregate redemption price of
approximately $42.0 million, including a redemption premium of $2.0 million.

In November 1991, the Company issued 4,115,000 shares of common stock at a
public offering price of $18.375 per share.

In November 1992, the Company issued 1,400,000 shares of $2.28 Cumulative
Preferred Stock with a liquidation preference of $25 per share, at a public
offering price of $25 per share, redeemable at the Company's option on or after
November 15, 1997.

In February 1994, the Company issued 2,760,000 shares of $2.625 Cumulative
Convertible Preferred Stock with a liquidation preference of $50 per share, at a
public offering price of $50 per share, redeemable at the Company's option on or
after February 16, 1997.

SIGNIFICANT BUSINESS ACQUISITIONS AND DISPOSITIONS

     Northern Acquisition

In July 1995, the Company entered into an agreement to purchase eight West Texas
gathering systems from Transwestern Gathering Company and Enron Permian
Gathering, Inc. In October 1995, the Company acquired and assumed the operations
of the Transwestern Gathering Company assets being sold pursuant to the
agreement for an adjusted purchase price of $4.0 million. Closing on the
remaining assets occurred in December 1995 for a purchase price of $14.7 million

     Redman Smackover Joint Venture

Effective January 1, 1995, the Company entered into the Redman Smackover Joint
Venture ("Redman Smackover") agreement with DDD Energy, Inc., a wholly owned
exploration and production subsidiary of Seitel, Inc., Redman Energy
Corporation, and DDD 1995 Oil & Gas Partnership. Redman Smackover acquired
working interests in three producing gas fields in East Texas in the Smackover
formation from Union Oil Company of California for an adjusted purchase price of
$11.0 million. The Company's contribution to the venture was approximately $5.4
million through December 31, 1995. The Company is the managing venturer with a
50% ownership interest.

                                       32
<PAGE>
 
                          WESTERN GAS RESOURCES, INC.
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)


     Oasis

Effective December 1, 1994, the Company acquired the West Texas gathering and
treating assets of Oasis Pipe Line Company ("Oasis") for approximately $26.0
million. The Oasis purchase included 14 gathering systems in the Permian Basin
comprising approximately 600 miles of gathering lines and two treating
facilities. In addition, the Company entered into a long-term agreement with
Oasis for 100 MMcf per day of firm transportation service on its intrastate
pipeline. The Company has installed a 200 MMcf per day pipeline interconnection
between this pipeline and the Katy Facility. Throughout 1995, the Company
disposed of various assets associated with this acquisition for an aggregate of
$8.9 million. The aggregate difference of $677,000 between the respective sales
price and book value of assets sold was accounted for as a purchase price
adjustment.

     Mountain Gas

Effective January 1, 1993, the Company acquired the stock of Mountain Gas
Resources, Inc. ("Mountain Gas") from Morgan Stanley Leveraged Equity Fund II,
L.P. for total consideration of approximately $168.2 million, including the
payment of certain transaction costs and the assumption and repayment of $35
million of long-term debt of Mountain Gas. Mountain Gas owns the Red Desert and
Granger facilities. The 22% interest in the Granger facility previously not
owned by Mountain Gas was purchased by the Company in two separate transactions
in November and December 1993 for an aggregate of $27.7 million. At the date of
acquisition, the Red Desert facility consisted of a cryogenic plant and the
Granger plant consisted of a refrigeration unit and a cryogenic unit. In
December 1993, the Company completed construction of an additional cryogenic
processing plant at Granger, at a total additional cost of approximately $4.8
million.

     Black Lake

Effective January 1, 1993, the Company purchased the Black Lake gas processing
plant and related reserves ("Black Lake") from Nerco Oil & Gas, Inc. ("Nerco")
for approximately $136.2 million. The acquisition included a 68.9% working
interest in the Black Lake field in Louisiana and a gas processing plant. The
purchase also included 50% of the stock of Black Lake Pipeline Company, which
owns a 240 mile liquids pipeline extending from Cotton Valley, Louisiana to Mont
Belvieu, Texas and transports NGLs for Black Lake and three unaffiliated gas
processing plants. In May 1994, the Company sold its 50% of the stock in Black
Lake Pipeline Company for approximately $5.4 million. The difference of
approximately $2.5 million between the book value and the sales price was
treated as a purchase price adjustment.

     Westana Joint Venture

Effective August 1, 1993, the Company formed Westana Gathering Company
("Westana"), a general partnership, with PanEnergy. Westana provides gas
gathering and processing services in the Anadarko Basin in Oklahoma and markets
natural gas and NGLs for producers connected to its system. The Company is the
principal operator with each partner holding a 50% ownership interest.

The Company contributed its Chester gas processing plant and gathering system,
with a net book value of $13.8 million, to Westana.  The Company also made
additional contractual partnership contributions of $7.2 million through
December 31, 1995 which are expected to be recouped through preferential
distributions. In addition to the assets contributed by the Company, Westana
operates PanEnergy's 400 mile gathering system and six compressor stations,
assets which will be contributed to Westana by PanEnergy.  PanEnergy has
received and accepted abandonment approval by the FERC and is now awaiting
certain clarification of the abandonment approval.  Upon clarification from the
Federal Energy Regulatory Commission ("FERC") on the abandonment approval,
PanEnergy will contribute their gathering assets to Westana.  The Company
expects the contribution of the PanEnergy assets to occur in 1996.

                                       33
<PAGE>

                          WESTERN GAS RESOURCES, INC.
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)


 
NOTE 2 - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
- ---------------------------------------------------

The significant accounting policies followed by the Company and its wholly owned
subsidiaries are presented herein to assist the reader in evaluating the
financial information contained herein. The Company's accounting policies are in
accordance with generally accepted accounting principles.

     Principles of Consolidation

The consolidated financial statements include the accounts of the Company and
the Company's wholly owned subsidiaries. All material intercompany transactions
have been eliminated in consolidation. The Company's interest in certain
investments is accounted for by the equity method.

     Revenue Recognition

Revenue for sales or services is recognized at the time the natural gas or NGLs
is delivered or at the time the service is performed.

     Earnings (Loss) Per Share of Common Stock

Earnings (loss) per share of common stock is computed by dividing net income
(loss) attributable to shares of common stock by the weighted average number of
shares of common stock outstanding. Net income (loss) attributable to shares of
common stock is net income (loss) less preferred stock dividends. The Company
declared preferred stock dividends of $11.6 million, $12.2 million and $6.1
million for the years ended December 31, 1995, 1994 and 1993, respectively. In
addition, net income (loss) for the year ended December 31, 1995 attributable to
common stock was reduced by the $2.0 million redemption premium and certain up-
front costs of $1.8 million paid on the 7.25% Preferred Stock. The computation
of fully diluted earnings per share of common stock for each of the three years
in the period ended December 31, 1995 was not dilutive; therefore, only primary
earnings per share of common stock is presented.

     Inventories

Product inventory includes $23.3 million and $47.5 million of residue gas and
$4.8 million and $3.5 million of NGLs at December 31, 1995 and 1994,
respectively.

The cost of residue gas and NGL inventories is determined by the weighted
average cost and last-in, first-out (LIFO) methods, respectively, on a location-
by-location basis. Residue inventory covered by hedging contracts is accounted
for on a specific identification basis.

     Property and Equipment

Property and equipment is recorded at the lower of cost or estimated realizable
value, including interest on funds borrowed to finance the construction of new
projects. Interest incurred during the construction period of new projects is
capitalized and amortized over the life of the associated assets. Such
capitalized interest was $1.5 million, $1.5 million and $4.9 million,
respectively, for the years ended December 31, 1995, 1994 and 1993.

Depreciation is provided using the straight-line method based on the estimated
useful life of each facility which ranges from three to 35 years. Useful lives
are determined based on the shorter of the life of the equipment or the reserves
serviced by the equipment. The cost of certain gas purchase contracts is
amortized using the units-of-production method.

     Oil and Gas Properties and Equipment

The Company follows the successful efforts method of accounting for oil and gas
exploration and production activities. Acquisition costs, development costs and
successful exploration costs are capitalized. Exploratory dry hole costs, lease
rentals and geological and geophysical costs are charged to expense as incurred.
Upon surrender of undeveloped properties, the original cost is charged

                                       34
<PAGE>
 
                         WESTERN GAS RESOURCES, INC.
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

 
against income. Producing properties and related equipment are depleted and
depreciated by the units-of-production method based on estimated proved reserves
for producing properties and proved developed reserves for lease and well
equipment.

     Impairment of Long-Lived Assets

As of October 1, 1995, the Company adopted Statement of Financial Accounting
Standards ("SFAS") No. 121, "Accounting for the Impairment of Long-Lived Assets
and for Long-Lived Assets to be Disposed of," which requires that an impairment
loss be recognized when the carrying amount of an asset exceeds the expected
future undiscounted net cash flows. This test is to be performed at the lowest
level at which cash flows can be identified. Historically, the Company had
performed this test for its oil and gas producing properties on a Company-wide
basis. Upon adoption of SFAS No. 121, the Company reviewed its assets at the
plant facilities and oil and gas producing properties levels. In order to
determine whether an impairment existed, the Company compared its net book value
of the asset to the undiscounted expected future cash flows, determined by
applying future prices estimated by management over the shorter of the lives of
the facilities or the reserves supporting the facilities. If impairment existed,
write-downs of assets were based upon expected discounted cash flows using an
interest rate commensurate with the risk associated with the underlying asset.

     Income Taxes

Deferred income taxes reflect the impact of "temporary differences" between
amounts of assets and liabilities for financial reporting purposes and such
amounts as measured by tax laws. These temporary differences are determined in
accordance with SFAS No. 109, "Accounting for Income Taxes."

     Hedging Activities

Gains and losses on hedges of product inventory are included in the carrying
amount of the inventory and are ultimately recognized in residue and NGL sales
when the related inventory is sold. Gains and losses related to qualifying
hedges, as defined by SFAS No. 80, "Accounting for Futures Contracts", of firm
commitments or anticipated transactions are recognized in residue and NGL sales
when the hedged physical transaction occurs. The $1.9 million of losses deferred
in inventory at December 31, 1995, recognized in January 1996, was more than
offset by margins from the Company's related forward fixed price hedges and
physical sales.

     Interest Rate Swap Agreements

The Company enters into interest rate swap agreements to manage exposure to
changes in interest rates. The transactions generally involve the exchange of
fixed and floating interest payment obligations without the exchange of the
underlying principal amounts. The net effect of interest rate swap activity is
reflected as an increase or decrease in interest expense. Any gains on
termination of interest rate swap agreements and the effects of foreign currency
positions that were marked to market are included in other income. In addition
to the financial risk that will vary during the life of these swap agreements in
relation to the maturity of the underlying debt and market interest rates, the
Company is subject to credit risk exposure from nonperformance of the
counterparties to the swap agreements.

     Concentration of Credit Risk

Financial instruments which potentially subject the Company to concentrations of
credit risk consist principally of trade accounts receivable. The risk is
limited due to the large number of entities comprising the Company's customer
base and their dispersion across industries and geographic locations. At
December 31, 1995, the Company had no significant concentrations of credit risk.

     Cash and Cash Equivalents

Cash and cash equivalents includes all cash balances and highly liquid
investments with an original maturity of three months or less.

                                       35
<PAGE>
 
                          WESTERN GAS RESOURCES, INC.
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)


     Supplementary Cash Flow Information

Interest paid was $38.8 million, $32.8 million and $16.4 million, respectively,
for the years ended December 31, 1995, 1994 and 1993.

Income taxes paid were $1.6 million, $1.1 million and $10.2 million,
respectively, for the years ended December 31, 1995, 1994 and 1993.

In February 1994, the President and Chief Operating Officer of the Company,
surrendered 25,016 shares of the Company's common stock, which were valued at
$31.50 per share based upon the February 22, 1994 closing price, as repayment of
a loan and all accrued interest of approximately $788,000.

In 1994, the Company exchanged its Pyote Treating Facility for the Jayhawk
gathering system in a transaction valued at approximately $800,000. In 1993, the
Company exchanged its Fairview Gas Processing Plant for various gas gathering
and processing equipment located in Utah and Kansas in a transaction valued at
approximately $3.7 million.

     Use of Estimates and Significant Risks

The preparation of consolidated financial statements in conformity with
generally accepted accounting principles requires management to make estimates
and assumptions that affect the amounts reported in these financial statements
and accompanying notes. The more significant areas requiring the use of
estimates relate to oil and gas reserves, fair value of financial instruments,
future cash flows associated with assets, and useful lives for depreciation,
depletion and amortization. Actual results could differ from those estimates.

The Company is subject to a number of risks inherent in the industry in which it
operates, primarily fluctuating prices and gas supply. The Company's financial
condition and results of operations will depend significantly upon the prices
received for natural gas and NGLs. These prices are subject to fluctuations in
response to changes in supply, market uncertainty and a variety of additional
factors that are beyond the control of the Company. In addition, the Company
must continually connect new wells to its gathering systems in order to maintain
or increase throughput levels to offset natural declines in dedicated volumes.
The number of new wells drilled will depend upon, among other factors, prices
for gas and oil, the energy policy of the federal government and the
availability of foreign oil and gas, none of which is within the Company's
control.

     Reclassification

Certain prior years' amounts in the consolidated financial statements and
related notes have been reclassified to conform to the presentation used in
1995.

     Stock Compensation

In October 1995, the Financial Accounting Standards Board issued SFAS No. 123,
"Accounting for Stock-Based Compensation," with an effective date for fiscal
years beginning after December 15, 1995. As permitted under SFAS No. 123, the
Company has elected to continue to measure compensation costs for stock-based
employee compensation plans as prescribed by Accounting Principles Board Opinion
No. 25, "Accounting for Stock Issued to Employees." The Company will comply with
the pro forma disclosure requirements of SFAS No. 123 in 1996 as required under
the pronouncement.

                                       36
<PAGE>

                         WESTERN GAS RESOURCES, INC.
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)


NOTE 3 - SPECIAL ITEMS
- ----------------------

In May 1995, the Company implemented a cost reduction program to reduce
operating and selling and administrative expenses. As a result of this program,
a $2.1 million restructuring charge was incurred, primarily related to employee
severance costs. This cost reduction program has not affected adversely the
overall operations of the Company.

In September 1995, the Company sold its 50% interest in the Waha Header, a
pipeline header in West Texas, resulting in an after-tax gain of $596,000.

As a result of the adoption of SFAS No. 121, the Company recognized a non-cash
loss on the impairment of long-lived assets of $15.1 million and $2.5 million
related to its property and equipment and oil and gas properties, respectively.

In December 1993, a fire at the Granger facility's NGL tank farm required the
facility to be shut down for one week. The new cryogenic processing plant as
well as the smaller existing cryogenic unit were also damaged. Construction of a
new tank farm and repairs to the cryogenic units were completed and fully
operational in August 1994. Claims for physical damage to the Company's
facilities totaled approximately $6.7 million. In addition, the Company
recorded, as other revenue, $3.3 million relating to lost income covered under
its business interruption insurance policy for the year ended December 31, 1994.
As of December 31, 1995, the Company had resolved substantially all remaining
issues and collected all remaining insurance proceeds. The total reimbursements
the Company received under its insurance policies were $6.6 million for physical
damage and $3.9 million related to business interruption.


NOTE 4 - RELATED PARTIES
- ------------------------

The Company purchases a significant portion of production from Williston Gas
Company ("Williston"), a joint venture of which the Company owns 50%, Westana
and Redman Smackover for resale to unrelated third parties. In addition, the
Company performs various operational and administrative functions for Williston
and Westana and charges each entity a monthly overhead fee to cover such
services.

The Company records receivable and payable balances at the end of each
accounting period related to the above referenced transactions and to payments
made by the Company on behalf of Williston and Westana that are typically
reimbursed in the next subsequent month.

The following table summarizes account balances reflected in the financial
statements (in 000s):

<TABLE>
<CAPTION>
                                                                 As of or for the Year Ended December 31,
                                                               ------------------------------------------
                                                                1995            1994               1993 
                                                               --------       --------          ---------
<S>                                                            <C>            <C>               <C>
Purchases:
     Williston..........................................      $  6,533        $  8,185          $   8,578 
     Westana............................................        14,012          16,290              6,866
     Redman Smackover...................................         7,651               -                  -
Administrative Costs:                                                                                   
     Williston..........................................            60              60                112
     Westana............................................           605             831                264
Accounts Receivable:                                                                                    
     Williston..........................................           968           1,121              1,006
     Westana............................................           544             555              1,111
     Redman Smackover...................................            37               -                  -
Accounts Payable:                                                                                       
     Williston..........................................           943           1,507              2,092
     Westana............................................         1,522           1,526              5,816
     Redman Smackover...................................      $  2,514        $      -          $       -
</TABLE>

                                       37
<PAGE>
 
                          WESTERN GAS RESOURCES, INC
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)


In July 1990, the Company loaned Bill M. Sanderson, President, Chief Operating
Officer and a Director, approximately $748,000 to purchase 294,524 shares of
common stock in the Company. In February 1994, the loan and all accrued interest
was repaid in full by Mr. Sanderson through surrender of 25,016 shares of the
Company's Common Stock, which were valued at $31.50 per share based upon the
February 22, 1994 closing price.

The Company has entered into agreements committing the Company to loan to
certain key employees an amount sufficient to exercise their options as each
portion of their options vests under the Key Employees' Incentive Stock Option
Plan and the Employee Option Plan (See Note 10). The Company will forgive the
loan and accrued interest if the employee has been continuously employed by the
Company for periods specified under the agreements. As of December 31, 1995 and
1994, loans, including accrued interest, totaling $2.1 million and $1.6 million,
respectively, were outstanding to key employees under these programs. The loans
are secured by a portion of the common stock issued upon exercise of the options
and are accounted for as a reduction of stockholders' equity. During 1995 and
1994, the Board of Directors approved the forgiveness of loans to key employees
totaling approximately $59,000 and $130,000, respectively, after resignation and
prior to satisfaction of the continuous service requirements of the loan
agreement.

NOTE 5 - RISK MANAGEMENT
- ------------------------

NATURAL GAS AND NGL HEDGES

The Company's policy is to utilize risk management tools primarily to reduce
commodity price risk for its equity production and to lock in profit margins for
its storage and marketing activities. It is the Company's objective to maintain
a balanced portfolio of financial exposure between physical obligations (fixed
price purchase and sales, storage inventories) and related financial instruments
(futures, swaps, and options positions). This effectively allows the Company to
fix its total margin because gains or losses in the physical market are offset
by corresponding losses or gains in the financial instruments market.

Hedging and related activities may expose the Company to the risk of financial
loss in certain circumstances, including instances when (i) production is less
than expected, (ii) the Company's customers fail to purchase or deliver the
contracted quantities of natural gas or NGLs, or (iii) the Company's over-the-
counter ("OTC") counterparties fail to perform. To the extent that the Company
engages in hedging activities, it may be prevented from realizing the benefits
of favorable price changes in the physical market. However, it is similarly
insulated against decreases in such prices.

In 1993, the Board of Directors adopted its Natural Gas Futures Trading
Procedures and created a committee of officers to oversee the Company's risk
management activities. As an additional control, the Company has developed
information systems that allow daily monitoring of its risk management
activities and its exposure related to futures, swaps and options positions
resulting from changes in the market.

The Company uses futures, swaps, and options to reduce price risk and basis
risk. Basis is the difference in price between the physical commodity being
hedged and the price of the futures contract used for hedging. Basis risk is the
risk that an adverse change in the futures market will not be completely offset
by an equal and opposite change in the cash price of the commodity being hedged.
Basis risk exists in natural gas primarily due to the geographic price
differentials between cash market locations and futures contract delivery
locations.

The Company enters into futures transactions on the New York Mercantile Exchange
and the Kansas City Board of Trade and through OTC swaps with creditworthy
counterparties consisting primarily of financial institutions and other natural
gas companies. The Company conducts its standard credit review of OTC
counterparties and has agreements with such parties which contain collateral
requirements. OTC exposure is marked to market daily for the credit review
process. The Company generally uses standardized swap agreements which allow for
offset of positive and negative exposures.

As of December 31, 1995, the Company held a notional quantity of approximately
330 Bcf of natural gas futures, swaps, and options extending from January 1996
to February 1998. This was comprised of approximately 37 Bcf long and 31 Bcf
short of

                                       38
<PAGE>
 
                          WESTERN GAS RESOURCES, INC.
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)


exchange-traded futures and 126 long and 136 short Bcf of OTC swaps and options.
As of December 31, 1994, the Company held a notional quantity of approximately
210 Bcf of futures, swaps, and options extending through December 1997. This was
comprised of approximately 34 Bcf long and 58 Bcf short of exchange-traded
futures and 56 long and 62 short Bcf of OTC swaps and options.

The Company enters into speculative futures trades on a very limited basis for
purposes which include testing of hedging techniques. Company procedures contain
strict guidelines for such trading including predetermined stop-loss
requirements and net open positions limits (currently, a total of 100 net
contracts long or short). Speculative futures positions are marked to market at
the end of each accounting period and any gain or loss is recognized in income
for that period. Net gains from such speculative activities for the year ended
December 31, 1995 were not material.

INTEREST RATE SWAPS

In anticipation of issuing the 1995 Senior Notes in the fourth quarter of 1995,
the Company entered into an interest rate lock on a notional amount of $50
million, linked to the ten-year U.S. Treasury Bill rate, with a creditworthy
counterparty to hedge against the risk of rising interest rates while it
completed the 1995 Senior Notes placement. At the time the Company terminated
the rate lock, interest rates had decreased, which resulted in the realization
of a $390,000 loss. The Company considered the loss to be a cost of obtaining
the privately placed debt and is therefore amortizing it over the ten-year term
of the 1995 Senior Notes.

At December 31, 1995 and 1994, the total notional principal amount of
outstanding interest rate swap agreements was $0 and $50 million, respectively.

The following table summarizes the results of the Company's interest rate swap
and foreign currency positions for the years ended December 31, 1995, 1994 and
1993 (000s):

<TABLE>
<CAPTION>
                                                         1995                1994            1993
                                                        -----              -------        --------
<S>                                                    <C>                 <C>              <C>
                                                                                
Net (increase) decrease to interest expense..........  $   358             $  (932)       $ 1,769 
                                                       =======             =======        ======= 
                                                                                                    
Interest rate swap losses capitalized................  $   390             $     -        $     -      
                                                       =======             =======        ======= 
                                                                                                    
Gains on swap termination............................  $     -             $     -        $ 2,590 
                                                       =======             =======        ======= 
                                                                                                    
Losses on foreign currency positions.................  $     -             $  (361)       $(1,175) 
                                                       =======             =======        =======
</TABLE>

NOTE 6 - FINANCIAL INSTRUMENTS
- ------------------------------

The estimated fair values of the Company's financial instruments have been
determined using appropriate market information and valuation methodologies.
Considerable judgment is required to develop the estimates of fair value; thus,
the estimates provided herein are not necessarily indicative of the amount that
the Company could realize upon the sale or refinancing of such financial
instruments.

<TABLE>
<CAPTION>
                                                   December 31, 1995        December 31, 1994 
                                                 --------------------    -----------------------
                                                 Carrying      Fair      Carrying         Fair
                                                   Value       Value      Value          Value
                                                 --------    --------    --------      ---------
                                                        (000s)                  (000s)
<S>                                             <C>         <C>          <C>           <C>
     Cash and cash equivalents................. $   5,795   $   5,795    $   8,708     $   8,708
     Trade accounts receivable.................   204,426     204,426      134,444       134,444
     Accounts payable..........................   199,513     199,513      145,244       145,244
     Short-term debt...........................    75,000      75,000       75,000        75,000
     Long-term debt............................ $ 454,500   $ 453,176    $ 418,000     $ 408,578
</TABLE>

                                       39
<PAGE>
 
                          WESTERN GAS RESOURCES, INC.
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)


 The following methods and assumptions were used by the Company in estimating
the fair value of its financial instruments:

     Cash and cash equivalents, trade accounts receivable and accounts payable
Due to the short-term nature of these instruments, the carrying value
approximates the fair value.

     Short-term debt
The short-term debt is borrowed on a revolving basis at a variable interest
rate; as a result, the carrying value approximates the fair value of the
outstanding debt.

     Long-term debt
A portion of the long-term debt was borrowed under a revolving credit facility
which accrues interest at current rates; as a result, carrying value
approximates fair value. The remaining portion of the Company's long-term debt
is comprised of fixed rate facilities; for this portion, fair market value was
estimated using discounted cash flows based upon the Company's current borrowing
rates for debt with similar maturities.


NOTE 7 - DEBT
- -------------

The following summarizes the Company's consolidated debt at the dates indicated
(000s):

<TABLE>
<CAPTION>
 
                                                         December 31,
                                                   -----------------------
                                                     1995           1994
                                                   --------       --------
<S>                                                <C>            <C>
     Variable rate revolving credit facility...    $137,500       $168,000
     Master shelf and senior notes.............     292,000        200,000
     Bank term loan facility...................      25,000         50,000
                                                   --------       --------
                                                         
       Total long-term debt....................     454,500        418,000
                                                   --------       --------
                                                         
     Short-term debt...........................      75,000         75,000
                                                   --------       --------
                                                         
       Total debt..............................    $529,500       $493,000
                                                   ========       ========
</TABLE>

     Financing Facilities

Revolving Credit Facility. The Company's variable rate Revolving Credit
Facility, as restated on September 2, 1994 and subsequently amended, with a
syndicate of eight banks, provides for a maximum borrowing base of $300 million,
of which $137.5 million was outstanding at December 31, 1995. If the facility
is not renewed, its commitment period will terminate on October 1, 1997. Any
outstanding balance thereunder at such time will convert to a three-year term
loan, which shall be payable in 12 equal quarterly installments, commencing
January 1, 1998. The Revolving Credit Facility bears interest, at the Company's
option, at certain spreads over the Eurodollar rate, at the Federal Funds rate
plus .50%, or at the agent bank's prime rate. The interest rate spreads are
adjusted based on the Company's debt to capitalization ratio. At December 31,
1995, the spread was 1.25% over the Eurodollar rate, resulting in an interest
rate of 7.21%.

The Company pays a commitment fee on the unused commitment ranging from .15% to
 .375% based on the debt to capitalization ratio. At December 31, 1995, the
Company's debt to capitalization ratio was .58 to 1 resulting in a commitment
fee rate of .375%.

Term Loan Facility. The Company also has a Term Loan Facility with four banks
for $25 million which bears interest at 9.87%. Payments on the Term Loan
Facility of $12.5 million are due in September 1996 and September 1997,
respectively. The Company intends to finance the $12.5 million payment due in
1996 through amounts available under the Revolving Credit Facility. The
agreements governing the Company's Revolving Credit and Term Loan Facilities
(the "Credit Facilities Agreement") contain certain mandatory prepayment terms.
If funded debt of the Company, which has a final maturity on or before October
1, 2000,

                                       40
<PAGE>
 
                          WESTERN GAS RESOURCES, INC.
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

exceeds four times (4.0 to 1.0) the sum of the Company's last four quarters'
cash flow (as defined in the agreement) less preferred stock dividends projected
to be paid during the next four quarters, the overage must be repaid in no more
than six monthly payments, commencing 90 days from notification. This mandatory
prepayment threshold will be reduced to 3.5 to 1.0 at September 1, 1998. At
December 31, 1995, taking into account all the covenants contained in the Credit
Facilities Agreement, the Company had approximately $50 million of available
borrowing capacity.

The Term Loan and Revolving Credit Facilities are unsecured. Pursuant to the
Credit Facilities Agreement, the Company is required to maintain a current ratio
(as defined therein) of at least 1.0 to 1.0, a minimum tangible net worth equal
to the sum of $345.0 million plus 50% of consolidated net income earned after
June 30, 1995 plus 75% of the net proceeds received after June 30, 1995 from the
sale of equity securities, a debt to capitalization ratio (as defined therein)
of no more than 60% through October 31, 1996 and 55% thereafter, and an EBITDA
to interest ratio of not less than 3.00 to 1.0 through October 31, 1996, 3.25 to
1.0 from November 1, 1996 through October 31, 1997 and 3.75 to 1.0 thereafter.
The Company is prohibited from declaring or paying dividends on or after
December 31, 1995 that in the aggregate exceed the sum of $10 million plus 50%
of consolidated net income earned after December 31, 1995 plus 50% of the
cumulative net proceeds received by the Company after December 31, 1995 from the
sale of any equity securities. The dividends declared in the fourth fiscal
quarter of 1995, payable in 1996, are excluded from this calculation. At
December 31, 1995, $10 million was available under this limitation, which is
sufficient to pay required preferred stock dividends in 1996. The Company
generally utilizes excess daily funds to reduce any outstanding revolving credit
balances and associated interest expense and it intends to continue such
practice. The $5.8 million cash balance at December 31, 1995 is an overnight
investment necessitated by the timing of cash receipts.

Master Shelf Agreement. In December 1991, the Company entered into a Master
Shelf Agreement (the "Master Shelf") with The Prudential Insurance Company of
America ("Prudential") pursuant to which Prudential agreed to quote, from time-
to-time, an interest rate at which Prudential or its nominee would be willing to
purchase up to $100 million of the Company's senior promissory notes (the
"Master Notes"). Any such Master Notes will mature in no more than 12 years,
with an average life not in excess of 10 years, and are unsecured. The Master
Shelf contains certain financial covenants which substantially conform with
those contained in the Revolving Credit Facility, as restated and amended. In
July 1993 and July 1995, Prudential and the Company amended the Master Shelf to
provide for additional borrowing capacity (for a total borrowing capacity of
$200 million) and to extend the term of the Master Shelf to October 31, 1995.
The Master Shelf Agreement, as restated and amended, is fully utilized, as
indicated in the following table (000s):

<TABLE>
<CAPTION>
                                    Interest          Final                                      
Issue Date                  Amount    Rate          Maturity                    Principal Payments Due
- ---------------------      --------   -----    ------------------     --------------------------------------------
<S>                        <C>        <C>      <C>                    <C>
 October 27, 1992          $25,000    7.51%    October 27, 2000       $8,333 each on October 27, 1998 through 2000
 October 27, 1992           25,000    7.99%    October 27, 2003       $8,333 each on October 27, 2001 through 2003
 September 22, 1993         25,000    6.77%    September 22, 2003     single payment at maturity
 December 27, 1993          25,000    7.23%    December 27, 2003      single payment at maturity
 October 27, 1994           25,000    9.05%    October 27, 2001       single payment at maturity
 October 27, 1994           25,000    9.24%    October 27, 2004       single payment at maturity
 July 28, 1995              50,000    7.61%    July 28, 2007          $10,000 each on July 28, 2003 through 2007 
                           -------                                   

                          $200,000
                          ========
</TABLE> 

1993 Senior Notes. On April 28, 1993 the Company sold $50 million of 7.65%
Senior Notes due 2003 to a group of insurance companies. Annual principal
payments of $7.1 million on the 1993 Senior Notes are due on April 30 of each
year from 1997 through 2002, with any remaining principal and interest
outstanding due on April 30, 2003. The 1993 Senior Notes contain certain
financial covenants that substantially conform with those contained in the
Master Shelf Agreement, as restated and amended.

1995 Senior Notes. The Company sold $42 million of 1995 Senior Notes to a group
of insurance companies in the fourth quarter of 1995, with an interest rate of
8.16% per annum and principal due in a single payment in December 2005. The 1995
Senior Notes contain certain financial covenants that conform with those
contained in the Master Shelf Agreement, as restated and amended. The Company
used the net proceeds from the sale to reduce borrowings under the Revolving
Credit Facility.

                                       41
<PAGE>
 
                          WESTERN GAS RESOURCES, INC.
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)


Receivables Facility. In April 1995, the Company entered into an agreement with
Receivables Capital Corporation ("RCC"), as purchaser, and Bank of America
National Trust and Savings Association ("BA"), as agent, pursuant to which the
Company will sell to RCC at face value on a revolving basis an undivided
interest in certain of the Company's trade receivables. As part of the sale, the
Company granted to RCC a security interest in such receivables. The Company may
sell up to $75 million of trade receivables under the Receivables Facility, at a
rate equal to RCC's commercial paper rate plus .375%, of which $75 million was
funded at a rate of 6.3% as of December 31, 1995. The Receivables Facility has a
364-day term and contains financial covenants similar to those in the Credit
Facilities Agreement, as restated and amended, along with certain covenants
regarding the quality of the trade receivables pool.

On September 2, 1994, in anticipation of entering into the Receivables Facility,
BA entered in a Master Note Agreement (the "Short-Term Note") with the Company
and advanced the Company $75 million at the Eurodollar rate plus .50%, which
resulted in an interest rate of 6.56% per annum at June 30, 1995. The Company
used the $75 million drawn on the Receivables Facility to repay the Short-Term
Note, which was then canceled.

COVENANT COMPLIANCE. At December 31, 1995, the Company was in compliance with
all covenants in its loan agreements.

Approximate future maturities of long-term debt at the date indicated are as
follows at December 31, 1995 (in 000s):

<TABLE>
     <S>                                             <C>
     1996........................................    $ 12,500
     1997........................................      54,019
     1998........................................      49,852
     1999........................................      49,852
     2000........................................      49,849
     Thereafter..................................     238,428
                                                     --------
                                                  
                                                     $454,500
                                                     ========
</TABLE>

NOTE 8 - INCOME TAXES
- ---------------------


The provision (benefit) for income taxes for the years ended December 31, 1995,
1994 and 1993 is comprised of (000s):

<TABLE>
<CAPTION>
                                                           1995                 1994                  1993
                                                         --------              ------                -------
<S>                                                      <C>                   <C>                   <C>
Current:                                                                             
 Federal...............................................  $(3,404)              $1,913                $10,090
 State.................................................        -                    -                      -
                                                         -------               ------                -------
                                                                                     
 Total Current.........................................   (3,404)               1,913                 10,090
                                                         -------               ------                -------
                                                                                     
Deferred:                                                                            
 Federal...............................................    1,192                2,113                  6,411
 State.................................................       54                  134                  1,028
                                                         -------               ------                -------
                                                                                     
 Total Deferred........................................    1,246                2,247                  7,439
                                                         -------               ------                -------
                                                                                     
  Total tax provision..................................  $(2,158)              $4,160                $17,529
                                                         =======               ======                =======
</TABLE>

                                       42
<PAGE>

                         WESTERN GAS RESOURCES, INC.
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

 
Temporary differences and carryforwards which give rise to the deferred tax
(assets) liabilities at December 31, 1995 and 1994 are as follows (000s):

<TABLE>
<CAPTION> 
                                                                                 1995           1994
                                                                               --------       --------
<S>                                                                            <C>            <C>
Property and equipment..................................................       $113,796       $ 91,633
Differences between the book and tax basis of acquired assets...........         21,235         22,750
                                                                               --------       --------
                                                                                         
   Total deferred tax liabilities.......................................        135,031        114,383
                                                                               --------       --------
                                                                                         
Alternative Minimum Tax ("AMT") credit carryforward.....................        (25,450)       (25,059)
Net Operating Loss ("NOL") carryforwards................................        (39,608)       (20,597)
                                                                               --------       --------
                                                                                         
   Total deferred tax assets............................................        (65,058)       (45,656)
                                                                               --------       --------
                                                                                         
   Net deferred income taxes............................................       $ 69,973       $ 68,727
                                                                               ========       ========
</TABLE>

The differences between the provision for income taxes at the statutory rate and
the actual provision for income taxes for the years ended December 31, 1995,
1994 and 1993 are summarized as follows (000s):

<TABLE>
<CAPTION>
                                                                1995        %           1994       %      1993     %
                                                              -------     ------      -------    -----  --------  -----
<S>                                                           <C>         <C>         <C>        <C>    <C>       <C>
Income tax (benefit) at statutory rate.................      $ (2,893)    (35.0)     $ 4,033     35.0  $ 19,471   35.0
State income taxes, net of federal 
   benefit.............................................           (99)     (1.2)         158      1.4       656    1.2
Permanent differences on asset write-downs.............         1,173      14.2            -        -         -      -
Increase in deferred income taxes to reflect the 
   change in the federal tax rate......................             -         -            -        -     2,100    3.8
Reduction of deferred income taxes to reflect NOL and
   AMT benefit carryforwards...........................             -         -            -        -    (3,779)  (6.8)
Adjustment to prior year income taxes..................          (300)     (3.6)           -        -         -      -
Other..................................................           (39)      (.5)         (31)    (0.3)     (919)  (1.7)
                                                              -------     -----       ------     ----   -------   ----
                                                                                             
Total..................................................      $ (2,158)    (26.1)     $ 4,160     36.1  $ 17,529   31.5
                                                              =======     =====       ======     ====   =======   ====
</TABLE>

At December 31, 1995, the Company had NOL and AMT credit carryforwards for
Federal and State income tax purposes of approximately $108.6 million and $25.5
million, respectively. These carryforward expire as follows (000s):

<TABLE>
<CAPTION>
                      Expiration Dates                          NOL           AMT
                -----------------------------                --------       --------
                <S>                                          <C>            <C>
                2003.........................                $    170       $      -   
                2004.........................                     412              -
                2005.........................                     943              -
                2006.........................                     478              -
                2007.........................                   1,080              -
                2008.........................                   6,561              -
                2009.........................                  51,115              -
                2010.........................                  47,835              -
                No expiration................                       -         25,450
                                                             --------       --------
                                                                       
                Total........................                $108,594        $25,450
                                                             ========       ========
</TABLE>

                                       43
<PAGE>
 
                          WESTERN GAS RESOURCES, INC.
             NOTES TO COSOLIDATED FINANCIAL STATEMENTS (CONTINUED)



The Company believes that the carryforwards will be utilized prior to their
expiration because they are substantially offset by existing taxable temporary
differences reversing within the carryforward period or are expected to be
realized by achieving future profitable operations based on the Company's
dedicated and owned reserves, past earnings history, projections of future
earnings and current assets.

NOTE 9 - COMMITMENTS AND CONTINGENT LIABILITIES
- -----------------------------------------------

     Katy Condemnation

Commencing in March 1993 and continuing through July 1993, Western Gas Resources
Storage, Inc. ("Storage"), a wholly owned subsidiary of the Company, filed a
total of 165 condemnation actions in the County Court at Law No. 1 and No. 2 of
Fort Bend County, Texas, to obtain certain storage rights and rights-of-way
relating to its Katy Gas Storage Facility and the related underground reservoir
("Katy").  The County Court appointed panels of Special Commissioners which
awarded compensation to the owners whose rights were condemned.  Condemnation
awards are a capital cost of the Katy project.

A majority of the land and mineral owners involved in the condemnation
proceedings appealed to County Court, seeking a declaration that Storage did not
possess the right to condemn or, in the alternative, that they should be awarded
more compensation than previously awarded by the Special Commissioners.  In all
of those appeals, the right to condemn issue has been resolved in favor of
Storage, although factual issues in individual cases remain open as to whether
that right was exercised properly.

Trials in four of the appeals to County Court have now been concluded.  The
first trial involved a parcel adjacent to the 82 acre site where the compression
facilities are located, the second trial involved a parcel within 1,000 feet of
the 82 acre site, and the third and fourth trials involved parcels further than
one mile from the 82 acre site.  The jury verdicts compared with the awards of
the Special Commissioners were, respectively, as follows:  $214,000 versus
$2,000; $38,000 versus $600; $553 versus $553; and $1,000 versus $500.  The
Company believes that several reversible errors were committed in the first two
trials and appeals of those cases are now pending in the Texas Court of Appeals.

     Internal Revenue Service

The Internal Revenue Service ("IRS") has completed its examination of the
Company's returns for the years 1990 and 1991 and has proposed adjustments to
taxable income reflected in such returns which would shift the recognition of
certain items of income and expense from one year to another ("Timing
Adjustments").  To the extent taxable income in a prior year is increased by
proposed Timing Adjustments, taxable income may be reduced by a corresponding
amount in other years. However, the Company would incur an interest charge as a
result of such adjustment.  The Company currently is protesting certain of these
proposed adjustments through the IRS appeals process.  In the opinion of
management, adequate provision has been made for the additional income taxes and
interest which may result from the proposed adjustments. However, it is
reasonably possible that the ultimate resolution could result in an amount which
differs materially from amounts provided.

     Other

The Company is involved in various other litigation and administrative
proceedings arising in the normal course of business.  In the opinion of
management, any liabilities (net of insurance) that may result from these
claims, as well as the specific claim discussed above, will not, individually or
in the aggregate, have a material adverse effect on the Company's financial
position or results of operations.

                                       44
<PAGE>
 
                          WESTERN GAS RESOURCES, INC.
             NOTES TO COSOLIDATED FINANCIAL STATEMENTS (CONTINUED)




NOTE 10 - EMPLOYEE BENEFIT PLANS
- --------------------------------

     Profit Sharing Plan

A discretionary profit sharing plan (a defined contribution plan) exists for all
Company employees meeting certain service requirements. The Company makes annual
contributions to the plan as determined by the Board of Directors and provides
for a match of 1% up to 4% of employee contributions. Contributions are made to
common/collective trusts for which Fidelity Management Trust Company acts as
trustee. The discretionary contributions were $1.3 million, $1.3 million and
$2.2 million, for the years ended December 31, 1995, 1994 and 1993,
respectively. The matching contributions were $227,000, $264,000 and $272,000
for the years ended December 31, 1995, 1994 and 1993, respectively.

     $5.40 Stock Option Plan

In April 1987, the Partnership adopted an employee option plan ("$5.40 Plan")
that authorizes granting options to employees to purchase 430,000 common units
in the Partnership. Pursuant to the Restructuring, the Company assumed the
Partnership's obligation under the employee option plan. The plan was amended
upon the Restructuring to allow each holder of existing options to exercise such
options and acquire one share of common stock for each common unit they were
originally entitled to purchase. The exercise price and all other terms and
conditions for the exercise of such options issued under the amended plan were
the same as under the plan, except that the Restructuring accelerated the time
upon which certain options may be exercised. In February 1994, the Board of
Directors retroactively approved, adopted and ratified approximately 53,000
options granted to employees in excess of the 430,000 options originally
authorized. No additional options may be granted under this plan. Options may be
exercised only at the rate of 20% of the shares of common stock subject to such
option for each year of continuous service by the optionee commencing from the
later of July 2, 1987 or the optionee's employment commencement date. The
Company has entered into agreements committing the Company to loan to certain
key employees an amount sufficient to exercise their options, provided that the
Company will not loan in excess of 25% of the total amount available to the
employee in any one year. The Company will forgive any associated loan and
accrued interest on July 2, 1997, if the employee is then employed by the
Company. As of December 31, 1995 and 1994, loans and accrued interest related to
100,374 and 96,963 shares of common stock, respectively, totaling $637,000 and
$545,000, were outstanding under these terms.

     Key Employees' Incentive Stock Option Plan and Non-employee Director Stock
      Option Plan

Effective April 1987, the Board of Directors of the Company adopted a Key
Employees' Incentive Stock Option Plan ("Key Employee Plan") and a Non-Employee
Director Stock Option Plan ("Directors' Plan") that authorize the granting of
options to purchase 250,000 and 20,000 shares of the Company's common stock,
respectively Under the plans, each of these options became exercisable as to 25%
of the shares covered by it on the later of January 1, 1992 or one year from the
date of grant, subject to the continuation of the optionee's relationship with
the Company, and became exercisable as to an additional 25% of the covered
shares on the latter of each subsequent January 1 through 1995 or on each
subsequent date of grant anniversary, subject to the same condition. The Company
has entered into agreements committing the Company to loan certain key employees
an amount sufficient to exercise their options as each portion of their options
vests. The Company will forgive the associated loan and accrued interest if the
employee has been continuously employed by the Company for four years after the
date of each loan increment. As of December 31, 1995 and 1994, loans and accrued
interest related to 125,000 and 93,750 shares of common stock, respectively,
totaling $1.5 million and $1.1 million, were outstanding under these terms.

     1993 Stock Option Plan

The 1993 Stock Option Plan (the "1993 Plan") became effective on May 24, 1993
after approval by the Company's stockholders. The 1993 Plan is intended to be an
incentive stock option plan in accordance with the provisions of Section 422 of
the Internal Revenue Code of 1986, as amended. The Company has reserved
1,000,000 shares of Common Stock for issuance upon exercise of options under the
1993 Plan. The 1993 Plan will terminate on the earlier of March 28, 2003 or the
date on which all options granted under the 1993 Plan have been exercised in
full.

                                       45
<PAGE>
 
                          WESTERN GAS RESOURCES, INC.
             NOTES TO COSOLIDATED FINANCIAL STATEMENTS (CONTINUED)



The Board of Directors of the Company determines and designates from time to
time those employees of the Company to whom options are to be granted. If any
option terminates or expires prior to being exercised, the shares relating to
such option shall be released and may be subject to reissuance pursuant to a new
option. The Board of Directors has the right to, among other things, fix the
price, terms and conditions for the grant or exercise of any option. The
purchase price of the stock under each option shall be the fair market value of
the stock at the time such option is granted. Options granted will vest 20% each
year on the anniversary of the date of grant commencing with the first
anniversary. The employee must exercise the option within five years of the date
each portion vests. At December 31, 1995 approximately 170,344 options were
vested. No options have been exercised under the 1993 plan.

The following table summarizes the stock option activity under the Company's
employee benefit plans:

<TABLE>
<CAPTION>
                                                 Per Share                        Number of Shares
                                                               ----------------------------------------------------------
                                                   Price                          Key Employee   Director's   
                                                   Range          $5.40 Plan          Plan         Plan        1993 Plan
                                             ----------------  -------------     ------------   -----------   -----------
<S>                                          <C>                <C>              <C>           <C>            <C>       
Balance 1/1/93..............                                         214,456          112,500       15,000             -
    Granted.................                  $26.50 - $35.50              -           75,000            -       385,394
    Exercised...............                    5.40 - 10.71         (90,147)         (37,500)      (1,500)            -
    Forfeited or canceled...                    5.40 - 35.00          (3,924)               -            -       (16,760)
                                                                 ------------       ----------  -----------   -----------
                                                                                                           
Balance 12/31/93............                                         120,385          150,000       13,500       368,634
    Granted.................                   18.63 - 32.50               -                -        5,000       321,464
    Exercised...............                    5.40 - 10.71         (44,345)         (37,500)      (3,750)            -
    Forfeited or canceled...                    5.40 - 35.00            (692)          (6,250)      (1,250)      (52,512)
                                                                 ------------       ----------  -----------   -----------
                                                                                                           
Balance 12/31/94............                                          75,348          106,250       13,500       637,586
    Granted.................                   16.13 - 23.50               -                -            -       137,567
    Exercised...............                    5.40 - 15.00         (26,161)         (31,250)           - 
    Forfeited or canceled...                   $5.40 - $35.00         (1,616)               -            -       (87,092)
                                                                 ------------      ----------   -----------   -----------
                                                                                                           
Balance 12/31/95............                                          47,571           75,000       13,500       688,061
                                                                 ============      ==========   ===========   ===========
</TABLE>

                                       46
<PAGE>
 
                          WESTERN GAS RESOURCES, INC.
                  NOTES TO CONSOLIDATED FINANCIAL STATEMENTS


NOTE 11 - SUPPLEMENTAL INFORMATION ON OIL AND GAS PRODUCING ACTIVITIES 
- ----------------------------------------------------------------------
(UNAUDITED):  
- -----------

     Costs

The following tables set forth capitalized costs at December 31, 1995, 1994 and
1993 and costs incurred for oil and gas producing activities for the years ended
December 31, 1995, 1994 and 1993 (000s):

<TABLE>
<CAPTION>
                                                                     1995          1994           1993
                                                                   ---------     ---------      ---------
<S>                                                                <C>           <C>            <C>
Capitalized costs:                                                                         
  Proved properties..............................................  $136,499      $136,861       $130,783
  Unproved properties............................................     6,279         7,448          3,855
                                                                   --------      --------       --------
                                                                                           
Total............................................................   142,778       144,309        134,638
  Less accumulated depletion.....................................   (46,792)      (35,346)       (17,877)
                                                                   --------      --------       --------
                                                                                           
Net capitalized costs............................................  $ 95,986      $108,963       $116,761
                                                                   ========      ========       ========
                                                                                           
The Company's share of Redman Smackover's net capitalized costs..  $  5,216      $      -       $      -
                                                                   ========      ========       ========
                                                                                           
Costs incurred:                                                                            
Acquisition of properties                                                                  
  Proved.........................................................  $  1,591      $  2,523       $ 95,518
  Unproved.......................................................       128         1,617          2,428
Development costs................................................     3,035         3,555          1,106
Exploration costs................................................     1,102         2,465            320
                                                                   --------      --------       --------
                                                                                           
Total costs incurred.............................................  $  5,856      $ 10,160       $ 99,372
                                                                   ========      ========       ========
                                                                                           
The Company's share of Redman Smackover's costs incurred.........  $  5,540      $      -       $      -
                                                                   ========      ========       ========
</TABLE>

     Results of Operations

The results of operations for oil and gas producing activities, excluding
corporate overhead and interest costs, for the years ended December 31, 1995,
1994 and 1993 are as follows (000s):

<TABLE>
<CAPTION>
                                                          1995        1994         1993
                                                        ---------   ---------    ---------
<S>                                                     <C>         <C>          <C>
Revenues from sale of oil and gas:                                           
  Sales...............................................  $  2,490    $  3,402     $  4,112
  Transfers...........................................    29,739      37,335       27,567
                                                        --------    --------     --------
                                                                             
     Total............................................    32,229      40,737       31,679
Production costs......................................    (4,160)     (4,960)      (2,963)
Exploration costs.....................................      (956)       (489)        (320)
Depreciation, depletion and amortization..............   (15,081)    (17,469)     (10,857)
Income tax expense....................................    (4,429)     (6,030)      (6,321)
                                                        --------    --------     --------
                                                                             
Results of operations.................................  $  7,603    $ 11,789     $ 11,218
                                                        ========    ========     ========
                                                                             
The Company's share of Redman Smackover's operations..  $    324    $      -     $      -
                                                        ========    ========     ========
</TABLE>

                                       47
<PAGE>
 
                          WESTERN GAS RESOURCES, INC.
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
 
 
     Reserve Quantity Information
 
Reserve estimates are subject to numerous uncertainties inherent in the
estimation of quantities of proved reserves and in the projection of future
rates of production and the timing of development expenditures. The accuracy of
such estimates is a function of the quality of available data and of engineering
and geological interpretation and judgement. Results of subsequent drilling,
testing and production may cause either upward or downward revisions of previous
estimates. Further, the volumes considered to be commercially recoverable
fluctuate with changes in prices and operating costs. Reserve estimates, by
their nature, are generally less precise than other financial statement
disclosures.
 
 The following table sets forth information for the years ended December 31,
1995, 1994 and 1993 with respect to changes in the Company's proved reserves,
 all of which are in the United States.  The Company has no significant
 undeveloped reserves.

<TABLE>
<CAPTION>
                                                                                     Natural       Crude
                                                                                       Gas           Oil
                                                                                      (MMcf)       (MBbls)
                                                                                     --------      -------
<S>                                                                                  <C>           <C>   
Proved reserves:                                                                        
    December 31, 1992........................................................          39,475          381
    Revisions of previous estimates..........................................          11,084          (42)
    Purchases of reserves in place*..........................................         100,886          261
    Production...............................................................         (15,854)        (107)
                                                                                     --------      -------
                                                                                              
    December 31, 1993........................................................         135,591          493
    Revisions of previous estimates..........................................          19,562           35
    Purchases of reserves in place...........................................             977          121
    Production...............................................................         (21,589)        (171)
                                                                                     --------      -------
                                                                                              
    December 31, 1994........................................................         134,541          478
    Revisions of previous estimates..........................................          (8,846)         437
    Production...............................................................         (16,875)        (200)
                                                                                     --------      -------
                                                                                              
    December 31, 1995........................................................         108,820          715
                                                                                     ========      =======
                                                                                        
The Company's share of Redman Smackover's proved reserves - December 31, 1995          12,647            -
                                                                                     ========      =======
</TABLE>

(*)  Primarily represents acquisition of Black Lake oil and gas properties
     effective January 1, 1993 from Nerco (See Note 1).

     Standardized Measures of Discounted Future Net Cash Flows

Estimated discounted future net cash flows and changes therein were determined
in accordance with SFAS No. 69.  Certain information concerning the assumptions
used in computing the valuation of proved reserves and their inherent
limitations are discussed below.  The Company believes such information is
essential for a proper understanding and assessment of the data presented.

Future cash inflows are computed by applying year-end prices of oil and gas
relating to the Company's proven reserves to the year-end quantities of those
reserves.  Future price changes are considered only to the extent provided by
contractual arrangements, including futures contracts, in existence at year-end.

The assumptions used to compute estimated future net revenues do not necessarily
reflect the Company's expectations of actual revenues or costs, nor their
present worth.  In addition, variations from the expected production rate also
could result directly or indirectly from factors outside of the Company's
control, such as unintentional delays in development, changes in prices or

                                       48
<PAGE>
 
                          WESTERN GAS RESOURCES, INC.
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

regulatory controls.  The reserve valuation further assumes that all reserves
will be disposed of by production.  However, if reserves are sold in place,
additional economic considerations could also affect the amount of cash
eventually realized.

Future development and production costs are computed by estimating the
expenditures to be incurred in developing and producing the proved oil and gas
reserves at the end of the year, based on year-end costs and assuming
continuation of existing economic conditions.

Future income tax expenses are computed by applying the appropriate year-end
statutory tax rates, with consideration of future tax rates already legislated,
to the future pretax net cash flows relating to the Company's proved oil and gas
reserves.  Permanent differences in oil and gas related tax credits and
allowances are recognized.

An annual discount rate of 10% was used to reflect the timing of the future net
cash flows relating to proved oil and gas reserves.

Information with respect to the Company's estimated discounted future cash flows
from its oil and gas properties for the years ended December 31, 1995, 1994 and
1993 is as follows (000s):

<TABLE>
<CAPTION>
                                                                                    1995        1994         1993  
                                                                                  ---------   ---------    ---------
                                                                                                                   
<S>                                                                               <C>         <C>          <C>     
Future cash inflows........................................................       $230,986    $239,188     $261,497
Future production costs....................................................        (52,442)    (50,214)     (36,978)
Future development costs...................................................         (3,564)     (9,230)     (12,623)
Future income tax expense..................................................        (32,125)    (26,811)     (35,856)
                                                                                  --------    --------     --------
Future net cash flows......................................................        142,855     152,933      176,040
10% annual discount for estimated timing of cash flows.....................        (61,093)    (57,202)     (51,915)
                                                                                  --------    --------     --------
Standardized measure of discounted future net cash flows relating to                                               
     proved oil and gas reserves...........................................       $ 81,762    $ 95,731     $124,125
                                                                                  ========    ========     ========
                                                                                                                   
The Company's share of Redman Smackover's standardized measure of                                                  
     discounted future net cash flows relating to proved oil and gas reserves     $  4,665    $      -     $      -
                                                                                  ========    ========     ======== 
</TABLE>

Principal changes in the Company's estimated discounted future net cash flows
for the years ended December 31, 1995, 1994 and 1993 are as follows (000s):

<TABLE>
<CAPTION>
                                                                                     1995        1994         1993  
                                                                                  ---------   ---------    ---------
<S>                                                                               <C>         <C>          <C>      
                                                                                                                    
January 1.................................................................        $ 95,731    $124,125     $ 35,922 
 Sales and transfers of oil and gas produced, net of production costs.....         (28,069)    (35,777)     (28,716)
 Net changes in prices and production costs related to future production..          14,499     (33,909)       2,318 
 Development costs incurred during the period.............................           3,035       3,555        1,106 
 Changes in estimated future development costs............................           2,631        (162)     (12,623)
 Revisions of previous quantity estimates.................................         (12,147)     14,830       17,819 
 Purchases of reserves in place...........................................               -       3,882      118,894 
 Accretion of discount....................................................           9,573      12,413        3,592 
 Net change in income taxes...............................................          (5,314)      9,045      (13,470)
 Other....................................................................           1,823      (2,271)        (717)
                                                                                  --------    --------     -------- 
                                                                                                                    
December 31...............................................................        $ 81,762    $ 95,731     $124,125 
                                                                                  ========    ========     ========  
</TABLE>

                                       49
<PAGE>
 
NOTE 12 - QUARTERLY RESULTS OF OPERATIONS (UNAUDITED):
- ------------------------------------------------------

The following summarizes certain quarterly results of operations (000s except
per share amounts):

<TABLE>
<CAPTION>  
                                                                                                 Earnings
                                                                                                (Loss) Per
                                                                                   Net           Share of
                                                  Operating        Gross         Income           Common
                                                   Revenues       Profit(a)      (Loss)           Stock
                                                   --------       ---------     ---------         -----
<S>                                               <C>             <C>           <C>             <C>
1995 quarter ended:                                                                            
  March 31.................................       $  303,701      $18,444       $ 1,941           $(.05)
  June 30..................................          304,408       17,671          (403)           (.28)
  September 30.............................          286,705       16,518           462            (.08)
  December 31..............................          362,170       22,578        (8,108)   (b)     (.43)
                                                  ----------      -------       -------           -----
                                                                                                
                                                  $1,256,984      $75,211       $(6,108)   (b)    $(.84)
                                                  ==========      =======       =======           =====
1994 quarter ended:                                                                             
  March 31.................................       $  275,704      $16,562       $ 1,011           $(.05)
  June 30..................................          244,470       14,851           181            (.12)
  September 30.............................          259,669       19,585         2,706            (.02)
  December 31..............................          283,646       21,558         3,466               -
                                                  ----------      -------       -------            ----
                                                                                                
                                                  $1,063,489      $72,556       $ 7,364           $(.19)
                                                  ==========      =======       =======           =====
</TABLE>                                                                     

(a) Excludes selling and administrative, interest, restructuring and income tax
    expenses.                                                                 
                                                                             
(b) Includes a non-cash expense resulting from the adoption of SFAS No. 121 of
    $17.6 million.                                                          
                                                                             
As a result of the reclassification of labor overhead from selling and       
administrative expense to plant operating expense in accordance with the
percentage established by the Council of Petroleum Accountants Society
guidelines, gross profit varies from the amounts reported on prior Forms 10-Q
and Form 10-K for years ended December 31, 1994.

                                       50
<PAGE>
 
ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON
        ACCOUNTING AND FINANCIAL DISCLOSURE

        None.


                                    PART III

ITEM 10. DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT


ITEM 11. EXECUTIVE COMPENSATION


ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT


ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

Pursuant to instruction G(3) to Form 10-K, Items 10, 11, 12 and 13 are omitted
because the Company will file a definitive proxy statement (the "Proxy
Statement") pursuant to Regulation 14A under the Securities Exchange Act of 1934
not later than 120 days after the close of the fiscal year.  The information
required by such Items will be included in the definitive proxy statement to be
so filed for the Company's annual meeting of stockholders scheduled for May 22,
1996 and is hereby incorporated by reference.

                                       51
<PAGE>
 
                                    PART IV

ITEM 14. EXHIBITS, FINANCIAL STATEMENT SCHEDULES, AND REPORTS ON FORM 8-K

(a)  The following documents are filed as part of this report:

     (1)  Financial Statements:

          Reference is made to the listing on page 25 for a list of all
          financial statements filed as a part of this report.

     (2)  Financial Statement Schedules:

          None required

     (3)  Exhibits:

     3.1  Certificate of Incorporation of Western Gas Resources, Inc. (Filed as
          exhibit 3.1 to Western Gas Resources, Inc.'s Registration Statement on
          Form S-1, Registration No. 33-31604 and incorporated herein by
          reference).

     3.2  Certificate of Amendment to the Certificate of Incorporation of
          Western Gas Resources, Inc. (Filed as exhibit 3.2 to Western Gas
          Resources, Inc.'s Registration Statement on Form S-1, Registration No.
          33-31604 and incorporated herein by reference).

     3.3  Bylaws of Western Gas Resources, Inc. (Filed as exhibit 3.3 to Western
          Gas Resources, Inc.'s Registration Statement on Form S-1, Registration
          No. 33-31604 and incorporated herein by reference).

     3.4  Assistant Secretary's Certificate regarding amendment to bylaws of
          Western Gas Resources, Inc. (Filed as exhibit 3.4 to Western Gas
          Resources, Inc.'s Registration Statement on Form S-4, Registration No.
          33-39588 dated March 27, 1991 and incorporated herein by reference).

     3.5  Certificate of Designation of 7.25% Cumulative Senior Perpetual
          Convertible Preferred Stock of the Company (Filed as exhibit 3.5 to
          Western Gas Resources, Inc.'s Registration Statement on Form S-1,
          Registration No. 33-43077 dated November 14, 1991 and incorporated
          herein by reference).

     3.6  Certificate of Designation of $2.28 Cumulative Preferred Stock of the
          Company. (Filed as exhibit 3.6 to Western Gas Resources, Inc.'s
          Registration Statement of Form S-1, Registration No. 33-53786 dated
          November 12, 1992 and incorporated herein by reference).

     3.7  Amendments of the By-Laws of Western Gas Resources, Inc. as adopted by
          the Board of Directors on December 13, 1993 (Filed as exhibit 3.7 to
          Western Gas Resources, Inc.'s Form 10-K for the year ended December
          31, 1993 and incorporated herein by reference).

     3.8  Certificate of Designation of the $2.625 Cumulative Convertible
          Preferred Stock of the Company (Filed under cover of Form 8-K dated
          February 24, 1994 and incorporated herein by reference).

     4.1  Subscription Agreements between the respective Founders and Western
          Gas Resources, Inc. regarding such Founders' initial subscription for
          shares of common stock (Filed as exhibit 10.31 to Western Gas
          Resources, Inc.'s Registration Statement on Form S-4, Registration No.
          33-39588 dated March 27, 1991 and incorporated herein by reference).

     4.2  Amendment No. 1 to Registration Rights Agreement as of May 1, 1991
          between Western Gas Resources, Inc., Bill Sanderson, WGP, Inc., Dean
          Phillips, Inc., Heetco, Inc. NV, Sauvage Gas Company and Sauvage Gas
          Service, Inc. (Filed as exhibit 4.2 to Western Gas Resources, Inc.'s
          Form 10-Q for the quarter ended June 30, 1991 and incorporated herein
          by reference).

    10.1  Restated Profit-Sharing Plan and Trust Agreement of Western Gas
          Resources, Inc. (Filed as exhibit 10.8 to Western Gas Resources,
          Inc.'s Registration Statement on Form S-4, Registration No. 33-39588
          dated March 27, 1991 and incorporated herein by reference).

                                       52
<PAGE>
 
     10.2  Employees Common Units Option Plan of Western Gas Processors, Ltd.
           (Filed as exhibit 10.9 to Western Gas Resources, Inc.'s Registration
           Statement on Form S-4, Registration No. 33-39588 dated March 27, 1991
           and incorporated herein by reference).

     10.3  Amendment to Employees Common Units Option Plan of Western Gas
           Processors, Ltd. (Filed as exhibit 10.10 to Western Gas Resources,
           Inc.'s Registration Statement on Form S-4, Registration No. 33-39588
           dated March 27, 1991 and incorporated herein by reference).

     10.4  Western Gas Resources, Inc. Non-Employee Director Stock Option Plan
           (Filed as exhibit 10.12 Western Gas Resources, Inc.'s Registration
           Statement on Form S-4, Registration No. 33-39588 dated March 27, 1991
           and incorporated herein by reference).

     10.5  Western Gas Resources, Inc. Key Employees' Incentive Stock Option
           Plan (Filed as exhibit 10.13 to Western Gas Resources, Inc.'s
           Registration Statement on Form S-4, Registration No. 33-39588 dated
           March 27, 1991 and incorporated herein by reference).

     10.6  Registration Rights Agreement among Western Gas Resources, Inc., WGP,
           Inc., Heetco, Inc., NV, Dean Phillips, Inc., Sauvage Gas Company and
           Sauvage Gas Service, Inc. (Filed as exhibit 10.14 to Western Gas
           Resources, Inc.'s Registration Statement on Form S-4, Registration
           No. 33-39588 dated March 27, 1991 and incorporated herein by
           reference).

     10.7  Second Amendment and First Restatement of Western Gas Processors,
           Ltd. Employees' Common Units Option Plan (Filed as exhibit 10.6 to
           Western Gas Resources, Inc.'s Registration Statement on Form S-1,
           Registration No. 33-43077 dated November 14, 1991 and incorporated
           herein by reference).

     10.8  Agreement to provide loans to exercise key employees' common stock
           options (Filed as exhibit 10.26 to Western Gas Resources, Inc.'s
           Annual Report on Form 10-K for the fiscal year ended December 31,
           1991 and incorporated herein by reference).

     10.9  Agreement to provide loans to exercise employees' common stock
           options (Filed as exhibit 10.27 to Western Gas Resources, Inc.'s
           Annual Report on Form 10-K for the fiscal year ended December 31,
           1991 and incorporated herein by reference).

     10.10 Agreement and Plan of Restructuring among the Company, the
           Partnership and the Founders (Filed as exhibit 10.10 to Western Gas
           Resources, Inc.'s Registration Statement on Form S-1, Registration
           No. 33-43077 dated November 14, 1991 and incorporated herein by
           reference).

     10.11 Stock Purchase Agreement dated October 23, 1991 between the Company
           and The 1818 Fund, L.P. (Filed as exhibit 10.19 to Western Gas
           Resources, Inc.'s Registration Statement on Form S-1, Registration
           No. 33-43077 dated November 14, 1991 and incorporated herein by
           reference).

     10.12 Registration Rights Agreement dated October 23, 1991 between the
           Company and The 1818 Fund, L.P. (Filed as exhibit 10.20 to Western
           Gas Resources, Inc.'s Registration Statement on Form S-1,
           Registration No. 33-43077 dated November 14, 1991 and incorporated
           herein by reference).

     10.13 Letter Agreement dated June 10, 1992 amending the Stock Purchase
           Agreement dated October 23, 1991 between the Company and the 1818
           Fund, L.P. (Filed as exhibit 10.36 to Western Gas Resources, Inc.'s
           Form 10-Q for the quarter ended June 30, 1992 and incorporated herein
           by reference).

     10.14 $100,000,000 Senior Notes Master Shelf Agreement dated as of December
           19, 1991 by and between the Company and the Prudential Insurance
           Company of America (Filed as exhibit 10.23 to Western Gas Resources,
           Inc.'s Registration Statement on Form S-1, Registration No. 33-53786
           dated November 12, 1992 and incorporated herein by reference).

     10.15 Letter Amendment No. 1 dated October 22, 1992 to $100,000,000 Senior
           Notes Master Shelf Agreement (Filed as exhibit 10.40 to Western Gas
           Resources, Inc's Form 10-K for the year ended December 31, 1992 and
           incorporated herein by reference).

                                       53
<PAGE>
 
     10.16 Stock Purchase Agreement (without exhibits) dated March 30, 1993 by
           and between the Company and The Morgan Stanley Leveraged Equity Fund
           II, L.P. (Filed as exhibit 10.45 to Western Gas Resources Inc.'s Form
           10-Q for the six months ended June 30, 1993 and incorporated herein
           by reference).

     10.17 Amendment No. 1 (without exhibits) to Stock Purchase Agreement dated
           as of March 30, 1993 by and between the Company and The Morgan
           Stanley Leveraged Equity Fund II, L.P. (Filed as exhibit 10.46 to
           Western Gas Resources Inc.'s Form 10-Q for the six months ended June
           30, 1993 and incorporated herein by reference).

     10.18 $150,000,000 Amended and Restated Master Shelf Agreement (without
           exhibits) effective as of July 22, 1993 by and between the Company
           and Prudential Insurance Company of America (Filed as exhibit 10.47
           to Western Gas Resources Inc.'s Form 10-Q for the six months ended
           June 30, 1993 and incorporated herein by reference).
           
     10.19 Note Purchase Agreement (without exhibits) dated as of April 1, 1993
           by and between the Company and the Purchasers for $50,000,000, 7.65%
           Senior Notes Due April 30, 2003 (Filed as exhibit 10.48 to Western
           Gas Resources Inc.'s Form 10-Q for the six months ended June 30,
           1993 and incorporated herein by reference).

     10.20 General Partnership Agreement (without exhibits), dated August 10,
           1993 for Westana Gathering Company by and between Western Gas
           Resources -Oklahoma, Inc. (a subsidiary of the Company) and Panhandle
           Gathering Company (Filed as exhibit 10.50 to Western Gas Resources
           Inc.'s Form 10-Q for the six months ended June 30, 1993 and
           incorporated herein by reference).

     10.21 Amendment to General Partnership Agreement dated August 10, 1993 by
           and between Western Gas Resources -Oklahoma, Inc. (a subsidiary of
           the Company) and Panhandle Gathering Company (Filed as exhibit 10.51
           to Western Gas Resources Inc.'s Form 10-Q for the six months ended
           June 30, 1993 and incorporated herein by reference).

     10.22 Operating and Maintenance Agreement (without exhibits) dated August
           10, 1993 by and between Western Gas Resources - Oklahoma, Inc. (a
           subsidiary of the Company) and Panhandle Gathering Company (Filed as
           exhibit 10.52 to Western Gas Resources Inc.'s Form 10-Q for the six
           months ended June 30, 1993 and incorporated herein by reference).

     10.23 Amendment to Operating and Maintenance Agreement dated August 10,
           1993 by and between Western Gas Resources - Oklahoma, Inc. (a
           subsidiary of the Company) and Panhandle Gathering Company (Filed as
           exhibit 10.53 to Western Gas Resources Inc.'s Form 10-Q for the six
           months ended June 30, 1993 and incorporated herein by reference).

     10.24 Pipeline Operating Agreement (without exhibits) dated August 10, 1993
           by and between Westana Gathering Company and Panhandle Eastern Pipe
           Line Company (Filed as exhibit 10.56 to Western Gas Resources Inc.'s
           Form 10-Q for the six months ended June 30, 1993 and incorporated
           herein by reference).

     10.25 Letter Amendment No. 1 to the Amended and Restated Master Shelf
           Agreement effective as of June 30, 1993 by and between the Company
           and Prudential Insurance Company of America (Filed as exhibit 10.59
           to Western Gas Resources Inc.'s Form 10-Q for the nine months ended
           September 30, 1993 and incorporated herein by reference).

     10.26 Asset Purchase Agreement (without exhibits) dated July 18, 1993 by
           and between the Company and Nerco Oil & Gas, Inc. (Filed as exhibit
           10.60 to Western Gas Resources Inc.'s Form 10-Q for the nine months
           ended September 30, 1993 and incorporated herein by reference).

     10.27 Amendment No. 1 to Note Purchase Agreement dated as of August 31,
           1993 by and among the Company and the Purchasers (Filed as exhibit
           10.61 to Western Gas Resources Inc.'s Form 10-Q for the nine months
           ended September 30, 1993 and incorporated herein by reference).

     10.28 First Amendment to Stock Purchase Agreement, amending the Stock
           Purchase Agreement dated October 23, 1991 between Western Gas
           Resources, Inc. and the 1818 Fund, L.P. (Filed as exhibit 10.62 to
           Western Gas Resources, Inc.'s Form 10-K for the year ended December
           31, 1993 and incorporated herein by reference).

                                       54
<PAGE>
 
     10.29 First Restated Loan Agreement (Revolver) (without exhibits) as of
           September 2, 1994 among Western Gas Resources, Inc. and NationsBank
           of Texas, N.A. as Agent and Certain Banks as Lenders. (Filed as
           exhibit 10.65 to Western Gas Resources, Inc.'s Form 10-Q for the nine
           months ended September 30, 1994 and incorporated herein by
           reference).

     10.30 Second Amendment to Third Restated Loan Agreement (Term) as of
           September 2, 1994 among Western Gas Resources, Inc. and NationsBank
           of Texas, N.A. as Agent and Certain Banks as Lenders. (Filed as
           exhibit 10.66 to Western Gas Resources, Inc.'s Form 10-Q for the nine
           months ended September 30, 1994 and incorporated herein by
           reference).

     10.31 Letter Amendment No. 2 to the Amended and Restated Master Shelf
           Agreement effective as of August 31, 1994 by and between Western Gas
           Resources, Inc. and Prudential Insurance Company of America. (Filed
           as exhibit 10.67 to Western Gas Resources, Inc.'s Form 10-Q for the
           nine months ended September 30, 1994 and incorporated herein by
           reference).

     10.32 Amendment No. 2 to Note Purchase Agreement dated as of August 31,
           1994 by and among Western Gas Resources, Inc. and the Purchasers.
           (Filed as exhibit 10.68 to Western Gas Resources, Inc.'s Form 10-Q
           for the nine months ended September 30, 1994 and incorporated herein
           by reference).

     10.33 Master Note dated September 2, 1994 between Western Gas Resources,
           Inc. and Bank of America National Trust and Savings Association.
           (Filed as exhibit 10.69 to Western Gas Resources, Inc.'s Form 10-Q
           for the nine months ended September 30, 1994 and incorporated herein
           by reference).

     10.34 First Amendment to First Restated Loan Agreement (Revolver) as of
           December 2, 1994 by and among Western Gas Resources, Inc. and
           NationsBank of Texas, N.A. as Agent and Certain Banks as Lenders.
           (Filed as exhibit 10.34 to Western Gas Resources, Inc.'s Form 10-K
           for the year ended December 31, 1994 and incorporated herein
           by reference).

     10.35 Third Amendment to Third Restated Loan Agreement (Term) as of
           December 2, 1994 by and among Western Gas Resources, Inc. and
           NationsBank of Texas, N.A. as Agent and Certain Banks as Lenders.
           (Filed as exhibit 10.35 to Western Gas Resources, Inc.'s Form 10-K
           for the year ended December 31, 1994 and incorporated herein by
           reference).

     10.36 Second Amendment to First Restated Loan Agreement (Revolver) as of
           February 23, 1995 among Western Gas Resources, Inc. and Nations Bank
           of Texas, N.A. as Agent and Certain Banks as Lenders. (Filed as
           exhibit 10.36 to Western Gas Resources, Inc.'s Form 10-Q for the 
           three months ended March 31, 1995 and incorporated herein by 
           reference).

     10.37 Fourth Amendment to Third Restated Loan Agreement (Term) as of
           February 23, 1995 among Western Gas Resources, Inc. and NationsBank
           of Texas, N.A. as Agent and Certain Banks as Lenders. (Filed as
           exhibit 10.37 to Western Gas Resources, Inc.'s Form 10-Q for the 
           three months ended March 31, 1995 and incorporated herein by 
           reference).

     10.38 Amendment No. 3 to Note Purchase Agreement as of March 22, 1995 by
           and among Western Gas Resources, Inc. and the Purchasers. (Filed as
           exhibit 10.38 to Western Gas Resources, Inc.'s Form 10-Q for the 
           three months ended March 31, 1995 and incorporated herein by 
           reference).

     10.39 Letter Amendment No. 3 To the Amended and Restated Master Shelf
           Agreement effective as of April 1, 1995 by and between Western Gas
           Resources, Inc. and Prudential Insurance Company of America. (Filed
           as exhibit 10.39 to Western Gas Resources, Inc.'s Form 10-Q for the
           three months ended March 31, 1995 and incorporated herein by 
           reference).

     10.40 Form of Employment Agreement by and between Western Gas Resources,
           Inc. and certain Executive Officers. (Filed as exhibit 10.40 to
           Western Gas Resources, Inc.'s Form 10-Q for the three months ended
           March 31, 1995 and incorporated herein by reference).

     10.41 Receivables Purchase Agreement dated as of February 28, 1995 among
           Western Gas Resources, Inc. (as seller) and Receivables Capital
           Corporation (as purchaser) and Bank of America National Trust and
           Savings Association (as agent). (Filed as exhibit 10.41 to Western
           Gas Resources, Inc.'s Form 10-Q for the six months ended June 30,
           1995 and incorporated herein by reference).

     10.42 Joint Venture Agreement of Redman-Smackover Joint Venture. (Filed as
           exhibit 10.42 to Western Gas Resources, Inc.'s Form 10-Q for the six
           months ended June 30, 1995 and incorporated herein by reference).

     10.43 Amendment No. 4 to Note Purchase Agreements as of July 14, 1995 by
           and among Western Gas Resources, Inc. and the Purchasers. (Filed as
           exhibit 10.43 to Western Gas Resources, Inc.'s Form 10-Q for the six
           months ended June 30, 1995 and incorporated herein by reference).

     10.44 Amendment No. 1 to Receivables Purchase Agreement as of July 1, 1995
           by and among Western Gas Resources, Inc., Receivables Capital
           Corporation and Bank of America National Trust and Savings
           Association. (Filed as exhibit 10.44 to Western Gas Resources, Inc.'s
           Form 10-Q for the six months ended June 30, 1995 and incorporated 
           herein by reference).

     10.45 Third Amendment to First Restated Loan Agreement (Revolver) dated
           July 19, 1995. (Filed as exhibit 10.45 to Western Gas Resources,
           Inc.'s Form 10-Q for the nine months ended September 30, 1995 and 
           incorporated herein by reference).

     10.46 Letter Amendment No. 4 to Amended and Restated Master Shelf Agreement
           dated July 28, 1995. (Filed as exhibit 10.46 to Western Gas
           Resources, Inc.'s Form 10-Q for the nine months ended September 30,
           1995 and incorporated herein by reference).

                                       55
<PAGE>
 
     10.47  Fifth Amendment to Third Restated Loan Agreement (Term) dated July
            19, 1995 (Filed as Exhibit 10.47 to Western Gas Resources, Inc.'s 
            Form 10-Q for the nine months ended September 30, 1995). 

     10.48  Fifth Amendment to the Master Shelf Agreement dated November 30, 
            1995 by and between Western Gas Resources, Inc. and Prudential
            Insurance Company of America.

     10.49  Second Amended and Restated Master Shelf Agreement effective January
            31, 1996 by and between Western Gas Resources, Inc. and Prudential
            Insurance Company of America.

     10.50  Sixth Amendment to Third Restated Loan Agreement (Term) dated
            November 29, 1995 by and among Western Gas Resources, Inc. and
            NationsBank, as agent, and the Lenders.
            
     10.51  Fourth Amendment to First Restated Loan Agreement (Revolver) dated
            November 29, 1995 by and among Western Gas Resources, Inc. and
            NationsBank, as agent, and the Lenders.

     10.52  Senior Note Purchase Agreeement dated November 29, 1995 by and among
            Western Gas Resources, Inc. and the Purchasers identified therein.

     10.53  Fifth Amendment to First Restated Loan Agreement (Revolver) dated
            March 22, 1996 by and among Western Gas Resources, Inc. and
            NationsBank, as agent, and the Lenders.

     10.54  Seventh Amendment to Third Restated Loan Agreement (Term) dated
            March 22, 1996 by and among Western Gas Resources, Inc. and
            NationsBank, as agent, and the Lenders.

     10.55  First Amendment to Third Restated Loan Agreement (Term) as of
            December 31, 1993 among Western Gas Resources, Inc. and NationsBank
            of Texas, N.A. as agent and certain banks as Lenders (filed as
            Exhibit 10.63 to Western Gas Resources, Inc.'s Form 10-K for the
            year ended December 31, 1993).

     11.1   Statement regarding computation of per share earnings.

     21.1   List of Subsidiaries of Western Gas Resources, Inc.

     23.1   Consent of Price Waterhouse LLP, independent accountants.

(b)  Reports on Form 8-K:

            A report on Form 8-K was filed on January 11, 1996 to notify the
            Securities and Exchange Commission and the Company's stockholders of
            the retirement of Bill M. Sanderson as President and Chief Operating
            Officer and the election of Lanny F. Outlaw to those positions as
            of April 1, 1996.

(c)  Exhibits required by Item 601 of Regulation S-K.  See (a) (3) above.


                                       56
<PAGE>
 
                                  SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange 
Act of 1934, the Registrant has duly caused this report to be signed on its 
behalf by the undersigned, thereunto duly authorized, in the City of Denver, 
State of Colorado on March 22, 1996.

                          WESTERN GAS RESOURCES, INC.
                          ---------------------------
                                 (Registrant)


                       By: /s/ Brion G. Wise
                           -------------------------
                           Brion G. Wise
                           Chairman of the Board and
                           Chief Executive Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, this report
has been signed below by the following persons on behalf of the Registrant and 
in the capacities and on the dates indicated.


/s/ Brion G. Wise          
- -------------------------  Chairman of the Board, Chief    March 22, 1996
Brion G. Wise              Executive Officer and Director

/s/ Bill M. Sanderson                                 
- -------------------------  President, Chief Operating      March 22, 1996
Bill M. Sanderson          Officer and Director

/s/ Walter L. Stonehocker                             
- -------------------------  Vice Chairman of the Board      March 22, 1996
Walter L. Stonehocker      and Director 


- -------------------------  Director                        March 22, 1996
Richard S. Robinson

/s/ Dean Phillips
- -------------------------  Director                        March 22, 1996
Dean Phillips

/s/ Ward Sauvage
- -------------------------  Director                        March 22, 1996
Ward Sauvage

/s/ James A. Senty
- -------------------------  Director                        March 22, 1996
James A. Senty


- -------------------------  Director                        March 22, 1996
Joseph E. Reid        
    
/s/ William J. Krysiak
- -------------------------  Vice President--Finance         March 22, 1996
William J. Krysiak         (Principal Financial and
                           Accounting Officer)
 
                                      57 

<PAGE>
 
                                                                [Execution Copy]

                            LETTER AMENDMENT NO. 5
                                      to
                  AMENDED AND RESTATED MASTER SHELF AGREEMENT


                               November 30, 1995


The Prudential Insurance Company
  of America
Pruco Life Insurance Company
c/o Prudential Capital Group
1201 Elm Street, Suite 4900
Dallas, Texas 75270

Ladies and Gentlemen:

          We refer to the Amended and Restated Master Shelf Agreement dated as
of December 19, 1991 among the undersigned and The Prudential Insurance Company
of America ("Prudential"), as amended by Letter Amendment No. 1, dated October
22, 1992, Letter Amendment No. 2, dated August 31, 1994, Letter Amendment No. 3,
dated April 1, 1995 and Letter Amendment No. 4, dated July 28, 1995 (such
agreement, as amended, being referred to as the "AGREEMENT"). Unless otherwise
defined herein, the terms defined in the Agreement shall be used herein as
therein defined.

          The Company has requested that you amend certain covenants and
definitions in the Agreement in anticipation of the Company entering into a Note
Purchase Agreement (the "1995 Note Purchase Agreement") relating to the issuance
and sale of the Company's 8.02% Senior Notes due November 2005 in an aggregate
principal amount of $42,000,000. In addition, the Company has requested that you
waive compliance with certain provisions of Paragraph 6C(3) and Paragraph 6C(8).
You have indicated your willingness to so amend and waive. Accordingly, it is
hereby agreed by you and us as follows:

     I.   AMENDMENTS TO THE AGREEMENT.  The Agreement is, effective the date
          ---------------------------                                       
first above written, hereby amended as follows:


     A.   Paragraph 5A(v)  is hereby deleted in its entirety and replaced, in
lieu thereof with the following:

          "(v)  prior to April 30 in each year, a projection of the consolidated
          cash flows of the Company, its Subsidiaries and the joint ventures in
          which the Company or its Subsidiaries has an investment for the
          current fiscal year, in the form of EXHIBIT 1 attached to Letter
          Amendment No. 5;"

                                                                   Exhibit 10.48
<PAGE>
 
     B.   The last paragraph of  Paragraph 5A is hereby deleted in its entirety
and replaced, in lieu thereof, with the following:

               "The Company also covenants that forthwith upon the chief
          executive officer, chief financial officer, Vice President-Finance,
          Executive Vice President-General Counsel, Treasurer or President of
          the Company obtaining knowledge of an Event of Default or Default, it
          will deliver to each holder of any Notes an Officer's Certificate
          specifying the nature and period of existence thereof and what action
          the Company proposed to take with respect thereto."

     C.   Paragraph 6A(2) is hereby deleted in its entirety and replaced, in
lieu thereof, with the following:

          "6A(2)  CURRENT RATIO. The ratio of Consolidated Current Assets to
          Consolidated Current Liabilities to be less than 1.0 to 1.0 at any
          time. For purpose of determining compliance with this paragraph 6A(2),
          (x) "Consolidated Current Liabilities" will be calculated without
          including any payments of principal of any Funded Debt of the Company
          which are required to be repaid within one year of the date of
          calculation and (y) Consolidated Current Assets shall include the
          amount of funds that are available to be borrowed under the NCNB
          Agreement, where "available" means, as of the date of the
          determination, the bank parties to the NCNB Agreement are committed to
          advance such funds, no default exists under the NCNB Agreement and all
          conditions to such banks advancing such funds would be satisfied.
          Prudential acknowledges that the Company currently calculates the
          current ratio only as of the end of each calendar month."

     D.   Paragraph 6A(3) is hereby deleted in its entirety and replaced, in
lieu thereof, with the following:

          "6A(3). DEBT MAINTENANCE. Adjusted Consolidated Debt to exceed (i)
          from August 31, 1994 through October 31, 1996, 60% of Consolidated Net
          Tangible Assets and (ii) at any time after October 31, 1996, 55% of
          Consolidated Net Tangible Assets. In any event, for purposes of
          determining compliance with this paragraph 6A(3), Adjusted
          Consolidated Debt shall include without limitation all indebtedness
          included in determining compliance with the similar covenant in the
          NCNB Agreement."

     E.   Paragraph 6C(3) is hereby deleted in its entirety and replaced, in
lieu thereof, with the following::

          "6C(3)  LIMITATION ON INVESTMENTS AND NEW BUSINESSES.  (i) Make any
          expenditure or commitment or incur any obligation or enter into or
          engage in any transaction except in the ordinary course of business
          (which shall be deemed to include expenditures, commitments,
          obligations and transactions permitted by

                                      -2-
<PAGE>
 
          clause (iii) or clause (iv) of this paragraph 6C(3)); (ii) engage
          directly or indirectly in any business or conduct any operations
          except in connection with or incidental to its present businesses and
          operations (which shall be deemed to include electric power generation
          and marketing and expenditures, commitments, obligations and
          transactions permitted by clause (iii) or clause (iv) of this
          paragraph 6C(3));  (iii) make any acquisitions of, capital
          contributions to, or other investments in, any Persons which exceed in
          the aggregate $500,000 other than (a) capital contributions to and
          investments in any joint venture described in EXHIBIT 2 to Letter
          Amendment No. 5 or in the Wholly Owned Subsidiaries, (b) acquisitions
          of equity in corporations or partnerships having as their primary
          business gas processing, transmission and gathering, oil and gas
          production and storage or gas marketing and related activities or
          electric power generation and marketing which do not exceed in the
          aggregate 10% of Consolidated Net Tangible Assets and (c) deposits
          with, investments in, obligations of and time deposits in any domestic
          bank or domestic branches of foreign banks which, at the time such
          deposit or investment is made, are rated A or better by Standard &
          Poor's Rating Group or Moody's Investors Service, Inc. or B or better
          by Thompson Bank Watch and investments maturing within one year from
          the date of acquisition in direct obligations of or obligations
          supported by, the full faith and credit of, the United States of
          America; or (iv) make any acquisition or investment in any properties
          other than gas processing, transmission and gathering facilities,
          domestic oil and gas properties, gas storage facilities, gas inventory
          and electric power generation facilities which exceeds $5,000,000;
          PROVIDED, however, that the loans referred to in paragraph 6C(7) may
          be outstanding."

     F.   Paragraph 6C(5)(iv) is hereby deleted in its entirety and replaced, in
lieu thereof, with the following:

               "(iv) any non Wholly Owned Subsidiary may merge or consolidate
     with any other corporation, provided that immediately after giving effect
     to such merger or consolidation (a) the continuing or surviving corporation
     of such merger or consolidation shall constitute a Subsidiary, and (b) no
     Event of Default or Default shall exist."

     G.   The dollar amount "$2,000,000" set forth in Paragraph 6C(6) shall be
deleted and replaced, in lieu thereof with "$4,000,000".

     H.   Paragraph 6C(8) is hereby deleted in its entirety and replaced, in
lieu thereof, with the following:

               "6C(8)  CONTRACTS; TAKE-OR-PAY AGREEMENTS.  Enter into any
          "take-or-pay" contract or other contract which requires it to pay for
          oil, gas, other hydrocarbons or other minerals prior to taking
          delivery thereof, PROVIDED that the Company may enter into such
          contracts so long as the aggregate maximum

                                      -3-
<PAGE>
 
          direct and contingent liability of the Company under such contracts
          does not exceed $500,000 at any one time, and PROVIDED FURTHER that
          the Company may enter into contracts with gas producers requiring the
          Company to make payments if the Company has not connected the
          producer's well to the Company's gathering system within a specified
          period of time, so long as the maximum direct or contingent liability
          of the Company under such contract does not exceed $500,000.  The
          Company and its Subsidiaries may enter into:  (a) Short Hedge Futures
          to sell natural gas or liquid hydrocarbons or to offset a Long Hedge
          Future; and (b) Long Hedge Futures to purchase natural gas or liquid
          hydrocarbons or to offset a Short Hedge Future; PROVIDED, however,
          that at the time of entering into a Short Hedge Future, the Company
          shall own and have available to it sufficient amounts of natural gas
          or liquid hydrocarbons, as the case may be, or shall own pursuant to
          firm contracts to deliver natural gas or liquid hydrocarbons, as the
          case may be, pursuant to such Short Hedge Future; PROVIDED, further,
          that at the time of entering into a Long Hedge Future, the Company
          shall have sufficient agreements from Counterparties to purchase
          natural gas or liquid hydrocarbons, as the case may be, from the
          Company so that the Company can resell natural gas or liquid
          hydrocarbons, as the case may be, delivered pursuant to such Long
          Hedge Future."

     I.   Paragraph 6F shall be deleted in its entirety and replaced, in lieu 
thereof, with the following:

               "6F. Other Agreements. Without the prior written consent of the
               Required Holder(s) of the Notes of each Series, the Company will
               not amend, modify or waive (i) any provision of the Term Loan
               Agreement which would shorten the maturity or average life of any
               loan thereunder, (ii) any provision of the Revolving Loan
               Agreement which would shorten any commitment thereunder, or (iii)
               any provision of the 1993 Note Purchase Agreement or the 1995
               Note Purchase Agreement which would shorten the maturity or
               average life of any note issued thereunder."

     J.   The definition of "Reinvestment Yield" set forth in paragraph 10A is
hereby amended by amending the last sentence thereof in its entirety to read as
follows:

               "Such implied yield shall be determined, (i) if necessary, by (x)
                                                                              - 
               converting U.S. Treasury bill quotations to bond-equivalent
               yields in accordance with accepted financial practice and (y)
                                                                          - 
               interpolating linearly between yields reported for various
               maturities and, (ii) if interest on such Notes is paid quarterly,
               by converting all such implied yields to a quarterly payment
               basis in accordance with accepted financial practice."


     K.   The definition of "Adjusted Consolidated Debt" set forth in Paragraph
10B is hereby deleted in its entirety and replaced, in lieu thereof, with the
following:

               "`ADJUSTED CONSOLIDATED DEBT' shall mean Consolidated Debt
               (excluding Debt in the amount of the Receivables Investment
               relating to the Permitted Securitization Program) PLUS Excess
               Working Capital Deficit."

     L.   The definition of "Consolidated Current Liabilities" set forth in
Paragraph 10B is hereby deleted in its entirety and replaced, in lieu thereof,
with the following:

               "`CONSOLIDATED CURRENT LIABILITIES' shall mean the consolidated
          current liabilities (including, without limitation, the Debt in
          respect of the Permitted Securitization Program) of the Company and
          its Subsidiaries, as determined in

                                      -4-
<PAGE>
 
          accordance with generally accepted accounting principles."
 

                                      -5-
<PAGE>
 
     M.   The definition of "Consolidated Net Tangible Assets" set forth in
Paragraph 10B is hereby amended by adding the following clause:

               "`CONSOLIDATED NET TANGIBLE ASSETS' shall mean the consolidated
          assets of the Company and its Subsidiaries, LESS, without duplication
          (i) Consolidated Current Liabilities MINUS Excess Working Capital
          Deficit, (ii) asset, liability, contingency and other reserves of the
          Company and its Subsidiaries, including reserves for depreciation and
          for deferred income taxes, (iii) all other liabilities of the Company
          and its Subsidiaries, except liabilities for Funded Debt of the types
          described in clauses (i), (ii) and (iii) of the definition of Debt,
          and (iv) treasury stock, unamortized debt discount and expense,
          goodwill, trademarks, brand names, patents, organizational expenses
          and any other intangible assets of the Company and its Subsidiaries,
          and any write-up of the values of any assets after June 30, 1991, all
          as determined in accordance with generally accepted accounting
          principles; PROVIDED, HOWEVER, that the term "Consolidated Net
          Tangible Assets" shall include the book value of long-term gas
          contracts with producers that the Company assumes in connection with
          acquisitions and that are reflected on the books of the Company as
          assets."

     N.   The following definition is hereby added to Paragraph 10B:

          "`COUNTERPARTY' shall mean (i) any Person described in EXHIBIT 3 to
          the Letter Amendment No. 5, (ii) any Person that is not an Affiliate
          of the Company and that has senior debt securities rated at least A by
          Standard & Poor's Rating Group or Moody's Investors Service, Inc. or
          whose obligations in respect of agreements described in the final
          proviso to paragraph 6C(8) or in the definition of Long Hedge Future
          or Short Hedge Future, as the case may be, are fully guaranteed by an
          affiliate of such Person whose senior debt securities are so rated,
          and (iii) any other Person that is not an Affiliate of the Company
          and with whom the Company has agreements of the nature described in
          the final proviso to paragraph 6C(8) or in the definition of Long
          Hedge Future or Short Hedge Future, so long as (a) the aggregate
          amount of all such agreements with such Person outstanding at any time
          shall not exceed $1,000,000 and (b) the Company has such agreements
          outstanding with no more than nine other such Persons at any time."

     O.   The definition of "Long Hedge Future" set forth in Paragraph 10B is
hereby deleted in its entirety and replaced, in lieu thereof, with the
following:

          "`LONG HEDGE FUTURE' shall mean an agreement, purchased on a
     commodities exchange or entered into with a Counterparty, that obligates
     the Company to purchase natural gas or liquid hydrocarbons, as the case may
     be, at a pre-determined price at a pre-determined time."

     P.   The definition of "NCNB Agreement" set forth in Paragraph 10B is 
hereby deleted in its entirety and replaced, in lieu thereof, with the 
following:

          "`NCNB AGREEMENT' shall mean (i) from the date hereof to August 31,
          1993, the First Restated Loan Agreement, dated as of October 31, 1991,
          between the Company and NCNB, as Agent and NCNB and Bankers Trust
          Company as Co-Managers of the Acquisition Loan and Certain Banks as
          Lenders, and (ii) from and after August 31, 1993, Term Loan Agreement
          and the Revolving Loan Agreement."

                                      -6-
<PAGE>
 
     Q.   The definition of "Short Hedge Future" set forth in Paragraph 10B is
hereby deleted in its entirety and replaced, in lieu thereof, with the
following:

          "`SHORT HEDGE FUTURE' shall mean an agreement, purchased on a
          commodities exchange or entered into with a Counterparty, that
          obligates the Company to sell natural gas or liquid hydrocarbons, as
          the case may be, at a pre-determined price at a pre-determined time."

     R.   Paragraph 10B is hereby amended by adding the following new 
definitions in alphabetical order:

          "`REVOLVING LOAN AGREEMENT' shall mean the Loan Agreement (Revolver)
          dated August 31, 1993 between the Company and NationsBank of Texas,
          N.A. (formerly known as NCNB Texas National Bank), as the provisions
          thereof have been or may be from time to time amended or waived in
          compliance with paragraph 6F.

          `TERM LOAN AGREEMENT' shall mean the Third Restated Loan Agreement
          (Term) dated August 31, 1993 between the Company and NationsBank of
          Texas, N.A. (formerly known as NCNB Texas National Bank), as Agent and
          Certain Banks as Lenders.

          `1993 NOTE PURCHASE AGREEMENT' shall mean, collectively, those certain
          separate Note Purchase Agreements each dated as of April 1, 1993,
          between the Company and each of the purchasers listed on Annex 1
          thereto, respectively, as the provisions thereof have heretofore been
          amended or waived or may be from time to time amended or waived in
          compliance with paragraph 6F.

          `1995 NOTE PURCHASE AGREEMENT' shall mean, the Note Purchase Agreement
          dated as of November 29, 1995 between the Company and the Purchasers
          listed on the signature page thereto, as the provisions thereof have
          heretofore been amended or waived or may be from time to time amended
          or waived in compliance with paragraph 6F."

     II.  WAIVERS; COMPLIANCE WITH PARAGRAPH 6(G).
          ---------------------------------------- 

     A.   Prior to the date hereof, the Company has entered into certain
futures transactions outside of a commodities exchange (the "OTC Transactions")
relating to the sale or purchase of natural gas or liquid hydrocarbons.
Prudential, as the Required Holder of the Notes, hereby waives any and all
violations of Paragraph 6C(8) of the Agreement resulting from OTC Transactions
which have been entered into prior to the effective date of this Letter
Amendment No. 5.

     B.   Prior to the date hereof, the Company has made certain capital
contributions to the joint ventures described in EXHIBIT 2 to Letter Amendment
No. 5 (the "Contributions"). Prudential, as the Required Holder of the Notes,
hereby waives any and all violations of Paragraph 6C(3) resulting from the
Contributions which have been made prior to the effective date of this Letter
Amendment No. 5.

     C.   Prudential hereby acknowledges that the Company has, in compliance
with Paragraph 6G of the Agreement, offered to amend this Agreement so as to
provide the holders of the Notes with the benefits of certain financial
covenants set forth in the 1995 Note Purchase Agreement which are more
restrictive than the covenants set forth in the Agreement. The Company hereby
agrees that it will, on or before January 31, 1996, execute and deliver an
amendment to this Agreement providing for such more restrictive covenants.

     III. MISCELLANEOUS; EFFECTIVENESS.
          ----------------------------- 

     A.   On and after the effective date of this letter amendment, each
reference in the Agreement to "this Agreement", "hereunder", "hereof", or words
of like import referring to the Agreement, and each reference in the Notes to
"the Agreement", "thereunder", "thereof", or words of like import referring to
the Agreement, shall mean the Agreement as amended by this letter amendment.
The Agreement, as amended by this letter amendment, is and shall continue to be
in full force and effect and is hereby in all respects ratified and confirmed.
The execution, delivery and effectiveness of this letter amendment shall not,
except as expressly provided herein, operate as a waiver of any right, power or
remedy under the Agreement nor constitute a waiver of any provision of the
Agreement.

     B.   This letter amendment may be executed in any number of counterparts
and by any combination of the parties hereto in separate counterparts, each of
which counterparts shall be an original and all of which taken together shall
constitute one and the same letter

                                      -7-
<PAGE>
 
amendment.
 
     C.   If you agree to the terms and provisions hereof, please evidence your
agreement by executing and returning at least a counterpart of this letter
amendment to the Company at its address at 12200 N. Pecos Street, Denver, CO
80234, Attention: Vice President-General Counsel.  This letter amendment shall
become effective as of the date first above written when and if (i) counterparts
of this letter amendment shall have been executed by us and you, and (ii) the
consent attached hereto shall have been executed by each Guarantor.


                              Very truly yours,

                              WESTERN GAS RESOURCES, INC.


                              By: /s/ JOHN C. WALTER
                                  ---------------------------------
                                    Title: Executive Vice President



Agreed as of the date
     first above written:

THE PRUDENTIAL INSURANCE COMPANY
  OF AMERICA

By: /s/ THE PRUDENTIAL INSURANCE COMPANY OF AMERICA
    -----------------------------------------------
     Vice President

PRUCO LIFE INSURANCE COMPANY

By: /s/ PRUCO LIFE INSURANCE COMPANY
    --------------------------------
     Vice President

                                      -8-
<PAGE>
 
                             CONSENT TO AMENDMENT

          Each of the undersigned is a Guarantor ("GUARANTOR" and, collectively,
"GUARANTORS") under separate guaranties (each being a "GUARANTY") dated as of
October 27, 1992 or August 31, 1993 in favor of The Prudential Insurance Company
of America ("PRUDENTIAL"), for itself and on behalf of affiliates of Prudential
with respect to the obligations of Western Gas Resources, Inc. (the "COMPANY")
under a Master Shelf Agreement dated as of December 19, 1991, as amended (the
"ORIGINAL AGREEMENT"). The terms used herein have the meaning specified in each
Guaranty unless otherwise defined herein. Prudential and the Company entered
into an Amended and Restated Master Shelf Agreement dated as of December 19,
1991 (as subsequently amended, the "AMENDED AGREEMENT") which amended the
Original Agreement. Prudential and the Company are entering into a Letter
Amendment No. 5 to Amended and Restated Master Shelf Agreement dated November
30, 1995 to which this consent is attached (the "LETTER AMENDMENT"). Each of the
undersigned hereby consents to the Letter Amendment and each hereby confirms and
agrees that its Guaranty is, and shall continue to be, in full force and effect
and is hereby confirmed and ratified in all respects except that, upon the
effectiveness of, and on and after the date of this consent, all references in
the Guaranty of the undersigned to the "Shelf Agreement", "thereunder",
"thereof" or words of like import referring to the Shelf Agreement shall mean
the Amended Agreement as amended by the Letter Amendment.

          Dated as of November 30, 1995.


MGTC, INC.
WESTERN GAS RESOURCES STORAGE, INC.
MOUNTAIN GAS RESOURCES, INC.
WESTERN GAS RESOURCES - TEXAS, INC.
WESTERN GAS RESOURCES OKLAHOMA, INC.
MIGC, INC.


By: /s/ JOHN C. WALTER
    ------------------
     Title:

<PAGE>
 
                                                                [Execution Copy]


================================================================================



                          WESTERN GAS RESOURCES, INC.



                                 $200,000,000



                                 SENIOR NOTES



              SECOND AMENDED AND RESTATED MASTER SHELF AGREEMENT



                         Dated as of December 19, 1991
                      (EFFECTIVE AS OF JANUARY 31, 1996)

================================================================================

                                                                   Exhibit 10.49
<PAGE>
 
                               TABLE OF CONTENTS

                            (Not Part of Agreement)

<TABLE>
<CAPTION>
<S>  <C>                                                                 <C>
RESTATEMENT AND AMENDMENT; AUTHORIZATION OF ISSUE OF NOTES............... -1-
     1A.  RESTATEMENT AND AMENDMENT OF EXISTING AGREEMENT................ -1-
     1B.  AUTHORIZATION OF ISSUE OF NOTES................................ -1-

PURCHASE AND SALE OF NOTES............................................... -2-
     2A.  FACILITY....................................................... -2-
     2B.  ISSUANCE PERIOD................................................ -2-
     2C.  SPREAD INFORMATION............................................. -2-
     2D.  REQUEST FOR PURCHASE........................................... -3-
     2E.  RATE QUOTES.................................................... -3-
     2F.  ACCEPTANCE..................................................... -3-
     2G.  MARKET DISRUPTION.............................................. -4-
     2H.  CLOSING........................................................ -4-
     2I.  FEES........................................................... -5-
          2I(1)  FACILITY FEE............................................ -5-
          2I(2)  DELAYED DELIVERY FEE.................................... -5-
          2I(3)  CANCELLATION FEE........................................ -6-
          2I(4)  STRUCTURING FEE......................................... -6-
          2I(5)  EXTENSION FEE........................................... -6-

CONDITIONS PRECEDENT..................................................... -6-
     3A.  CERTAIN DOCUMENTS.............................................. -6-
     3B.  REPRESENTATIONS AND WARRANTIES; NO DEFAULT..................... -7-
     3C.  PURCHASE PERMITTED BY APPLICABLE LAWS.......................... -8-
     3D.  LEGAL MATTERS.................................................. -8-
     3E.  PROCEEDINGS.................................................... -8-
     3F.  AMENDMENT OF CREDIT AGREEMENTS................................. -8-
     3G.  FACILITY FEE PAYMENT........................................... -8-
     3H.  CONSENT OF BANKS............................................... -8-

PREPAYMENTS.............................................................. -8-
     4A.  REQUIRED PREPAYMENTS........................................... -8-
     4B.  OPTIONAL PREPAYMENT WITH YIELD-MAINTENANCE AMOUNT.............. -9-
     4C.  NOTICE OF OPTIONAL PREPAYMENT.................................. -9-
     4D.  APPLICATION OF PREPAYMENTS..................................... -9-
     4E.  RETIREMENT OF NOTES............................................ -9-

AFFIRMATIVE COVENANTS................................................... -10-
</TABLE>

                                       i
<PAGE>
 
<TABLE>
<S>  <C>                                                                 <C>
     5A.  FINANCIAL STATEMENTS.......................................... -10-
     5B.  INSPECTION OF PROPERTY........................................ -12-
     5C.  COVENANT TO SECURE NOTES EQUALLY.............................. -12-
     5D.  AGREEMENT ASSUMING LIABILITY ON NOTES......................... -12-
     5E.  NOTICE OF MATERIAL EVENTS..................................... -13-
     5F.  MAINTENANCE OF PROPERTIES..................................... -13-
     5G.  MAINTENANCE OF EXISTENCE AND QUALIFICATIONS................... -13-
     5H.  INSURANCE..................................................... -13-
     5I.  COMPLIANCE WITH AGREEMENTS AND LAW............................ -14-
     5J.  COMPLIANCE WITH ENVIRONMENTAL LAWS............................ -14-
     5K.  INFORMATION REQUIRED BY RULE 144A............................. -15-
     5L.  ERISA......................................................... -15-
     5M.  GUARANTIES.................................................... -15-

NEGATIVE COVENANTS...................................................... -15-
     6A.  FINANCIAL COVENANTS........................................... -15-
          6A(1).  CONSOLIDATED TANGIBLE NET WORTH....................... -15-
          6A(2).  CURRENT RATIO......................................... -16-
          6A(3).  DEBT MAINTENANCE...................................... -16-
          6A(4).  FIXED CHARGE COVERAGE RATIO........................... -16-
     6B.  DIVIDEND LIMITATION........................................... -16-
     6C.  LIEN, DEBT, AND OTHER RESTRICTIONS............................ -16-
          6C(1).  LIENS................................................. -16-
          6C(2).  DEBT.................................................. -18-
          6C(3).  LIMITATION ON INVESTMENTS AND NEW BUSINESSES.......... -18-
          6C(4).  SALE OF STOCK AND DEBT OF SUBSIDIARIES................ -19-
          6C(5).  MERGER AND SALE OF ASSETS............................. -19-
          6C(6).  LEASE RENTALS......................................... -20-
          6C(7).  LIMITATION ON CREDIT EXTENSIONS....................... -21-
          6C(8).  CONTRACTS; TAKE-OR-PAY AGREEMENTS..................... -21-
          6C(9).  SALE OR DISCOUNT OF RECEIVABLES....................... -21-
          6C(10).  GUARANTIES........................................... -21-
          6C(11).  TRANSACTIONS WITH AFFILIATES......................... -22-
          6C(12).  PANHANDLE JOINT VENTURE DEBT......................... -23-
     6D.  ISSUANCE OF STOCK BY SUBSIDIARIES............................. -23-
     6E.  OTHER AGREEMENTS.............................................. -23-

EVENTS OF DEFAULT....................................................... -23-
     7A.  ACCELERATION.................................................. -23-
     7B.  RESCISSION OF ACCELERATION.................................... -26-
     7C.  NOTICE OF ACCELERATION OR RESCISSION.......................... -27-
     7D.  OTHER REMEDIES................................................ -27-
</TABLE>

                                      ii
<PAGE>
 
<TABLE>
<S>  <C>                                                                 <C>
REPRESENTATIONS, COVENANTS AND WARRANTIES............................... -27-
     8A.  ORGANIZATION.................................................. -27-
     8B.  FINANCIAL STATEMENTS.......................................... -27-
     8C.  ACTIONS PENDING............................................... -28-
     8D.  OUTSTANDING DEBT.............................................. -28-
     8E.  ENVIRONMENTAL COMPLIANCE...................................... -28-
     8F.  TAXES......................................................... -28-
     8G.  CONFLICTING AGREEMENTS AND OTHER MATTERS...................... -29-
     8H.  OFFERING OF NOTES............................................. -29-
     8I.  REGULATION G, ETC............................................. -29-
     8J.  ERISA......................................................... -30-
     8K.  GOVERNMENTAL CONSENT.......................................... -30-
     8L.  TITLE TO PROPERTIES........................................... -30-
     8M.  HOSTILE TENDER OFFERS......................................... -30-
     8N.  DISCLOSURE.................................................... -31-
     8O.  DELIVERY OF NCNB AGREEMENT.................................... -31-
     8P.  PUBLIC UTILITY HOLDING COMPANY ACT; FEDERAL POWER ACT......... -31-

REPRESENTATIONS OF THE PURCHASERS....................................... -31-
     9A.  NATURE OF PURCHASE............................................ -31-
     9B.  SOURCE OF FUNDS............................................... -31-

DEFINITIONS............................................................. -32-
     10A. YIELD-MAINTENANCE TERMS....................................... -32-
     10B. OTHER TERMS................................................... -33-
     10C. ACCOUNTING TERMS AND DETERMINATIONS........................... -44-

MISCELLANEOUS........................................................... -44-
     11A. NOTE PAYMENTS................................................. -44-
     11B. EXPENSES...................................................... -44-
     11C. CONSENT TO AMENDMENTS......................................... -45-
     11D. FORM, REGISTRATION, TRANSFER AND EXCHANGE OF NOTES;
          LOST NOTES.................................................... -46-
     11E. PERSONS DEEMED OWNERS; PARTICIPATIONS......................... -46-
     11F. SURVIVAL OF REPRESENTATIONS AND WARRANTIES;
          ENTIRE AGREEMENT.............................................. -46-
     11G. SUCCESSORS AND ASSIGNS........................................ -47-
     11H. DISCLOSURE TO OTHER PERSONS; CONFIDENTIALITY.................. -47-
     11I. NOTICES....................................................... -47-
     11J. PAYMENTS DUE ON NON-BUSINESS DAYS............................. -48-
     11K. SATISFACTION REQUIREMENT...................................... -48-
     11L. GOVERNING LAW................................................. -48-
     11M. SEVERABILITY.................................................. -48-
     11N. DESCRIPTIVE HEADINGS.......................................... -48-
     11O. COUNTERPARTS.................................................. -48-
</TABLE> 

                                      iii
<PAGE>
 
<TABLE> 
     <S>                                                                 <C>  
     11P.  BINDING AGREEMENT............................................ -49-
</TABLE> 

PURCHASER SCHEDULE
SCHEDULE 5A -- FORM OF PROJECTIONS
SCHEDULE 6C(2) -- EXISTING DEBT AND LIENS
SCHEDULE 6C(3) -- JOINT VENTURES
SCHEDULE 6C(8) -- COUNTERPARTIES
EXHIBIT A -- FORM OF NOTE
EXHIBIT B -- FORM OF REQUEST FOR PURCHASE
EXHIBIT C -- FORM OF CONFIRMATION OF ACCEPTANCE
EXHIBIT D -- FORM OF OPINION OF COMPANY'S COUNSEL
EXHIBIT E -- LIST OF AGREEMENTS RESTRICTING DEBT
EXHIBIT F -- FORM OF CONFIDENTIALITY LETTER
EXHIBIT G -- FORM OF GUARANTY
EXHIBIT H -- FORM OF INTERCREDITOR AGREEMENT

                                      iv
<PAGE>
 
                          WESTERN GAS RESOURCES, INC.
                             12200 N. PECOS STREET
                               DENVER, CO 80234



                                                         As of December 19, 1991


To:  The Prudential Insurance Company
      of America ("PRUDENTIAL")
     c/o Prudential Capital Group
     Four Gateway Center
     100 Mulberry Street
     Newark, New Jersey 07102

                                 SENIOR NOTES
                                 ------------

Ladies and Gentlemen:

          The undersigned, Western Gas Resources, Inc. (the "COMPANY"), hereby
agrees with each Purchaser as follows:

          PARAGRAPH 1.  RESTATEMENT AND AMENDMENT; AUTHORIZATION OF ISSUE OF
NOTES.

          1A.  RESTATEMENT AND AMENDMENT OF EXISTING AGREEMENT.  The Company and
Prudential entered into a Master Shelf Agreement dated as of December 19, 1991
as amended by Letter Amendment No. 1 dated October 22, 1992 (the "ORIGINAL
AGREEMENT").  On July 22, 1993, the Company and Prudential entered into an
Amended and Restated Master Shelf Agreement which Amended and Restated the
Original Agreement in its entirety.  Such Amended and Restated Master Shelf
Agreement has been amended by Letter Amendment No. 1 dated June 30, 1993, Letter
Amendment No. 2 dated August 31, 1994, Letter Amendment No. 3 dated April 1,
1995, Letter Amendment No. 4 dated July 28, 1995 and Letter Amendment No. 5
dated November 30, 1995. (The Amended and Restated Master Shelf Agreement, as
amended, is referred to herein as the "EXISTING AGREEMENT").  The Company has
issued to Prudential or Prudential Affiliates $200,000,000 aggregate principal
amount of Senior Notes pursuant to the Existing Agreement.  The Company and
Prudential are entering into this Agreement to, among other things, incorporate
the amendments into the agreement and amend other provisions of the Existing
Agreement. Accordingly, the Company, Prudential and each Purchaser agrees that
the Existing Agreement is hereby amended and restated in its entirety to read as
provided in this Agreement.

          1B.  AUTHORIZATION OF ISSUE OF NOTES.  The Company has authorized and
issued 
<PAGE>
 
its senior promissory notes (the "NOTES") in the aggregate principal amount of
$200,000,000, dated the date of issue thereof, maturing, in the case of each
Note so issued, no more than 12 years after the date of original issuance 
thereof (with an average life not in excess of 10 years), bearing interest on
the unpaid balance thereof from the date thereof at the rate per annum, and
having such other particular terms, as set forth, in the case of each Note so
issued, in the Confirmation of Acceptance with respect to such Note delivered
pursuant to paragraph 2F, and substantially in the form of Exhibit A attached
hereto.  The term "NOTES" as used herein shall include each Note delivered
pursuant to any provision of this Agreement and each Note delivered in
substitution or exchange for any such Note pursuant to any such provision.  
Notes which have (i) the same final maturity, (ii) the same installment payment
                  -                            --                              
dates, (iii) the same installment payment amounts (as a percentage of the
        ---                                                              
original principal amount of each Note), (iv) the same interest rate, and (v)
                                          --                               - 
the same interest payment periods, are herein called a "SERIES" of Notes.
                                                                          
Capitalized terms used herein have the meanings specified in paragraph 10.
- ------------------------------------------------------------------------- 

          PARAGRAPH 2.   PURCHASE AND SALE OF NOTES.

          2A.  FACILITY.  Prudential is willing to consider, in its sole
discretion and within limits which may be authorized for purchase by Prudential
and Prudential Affiliates from time to time, the purchase of Notes pursuant to
this Agreement.  The willingness of Prudential to consider such purchase of
Notes is herein called the "FACILITY".  At any time, the aggregate principal
amount of Notes stated in paragraph 1, minus (i) the aggregate principal amount
                                       -----                                   
of Notes purchased and sold pursuant to this Agreement prior to such time
(including the Existing Notes) and (ii) the aggregate principal amount of
Accepted Notes which have not yet been purchased and sold hereunder prior to
such time, is herein called the "AVAILABLE FACILITY AMOUNT" at such time.
Notwithstanding the willingness of Prudential to consider purchases of Notes,
this Agreement is entered into on the express understanding that neither
Prudential nor any other Prudential Affiliate shall be obligated to make or
accept offers to purchase Notes, or to quote rates, spreads or other terms with
respect to specific purchases of Notes, and the Facility shall in no way be
construed as a capital commitment by Prudential or any other Prudential
Affiliate.

          2B.  ISSUANCE PERIOD.  Notes may be issued and sold pursuant to this
Agreement until the earlier of (i) the Termination Date (or if such day is not a
Business Day, the Business Day next preceding such day) and (ii) the thirtieth
day after Prudential shall have given to the Company, or the Company shall have
given to Prudential, a notice stating that it elects to terminate the issuance
and sale of Notes pursuant to this Agreement (or if such thirtieth day is not a
Business Day, the Business Day next preceding such thirtieth day).  The period
during which Notes may be issued and sold pursuant to this Agreement is herein
called the "ISSUANCE PERIOD".  The "TERMINATION DATE" shall be October 31, 1995.

          2C.  SPREAD INFORMATION.  Upon request by the Company on any Business
Day during the Issuance Period if there is an Available Facility Amount on such
Business Day, Prudential will, to the extent reasonably practicable, provide to
the Company information (by telecopier or telephone) with respect to various
spreads at which Prudential or Prudential Affiliates might be interested in
purchasing Notes of different average lives.  The amount and content of

                                      -2-
<PAGE>
 
information so provided shall be in the sole discretion of Prudential, but it is
the intent of Prudential to provide information which will be of use to the
Company in determining whether to initiate procedures for use of the Facility.
Information so provided shall not constitute an offer to purchase Notes, and
neither Prudential nor any other Prudential Affiliate shall be obligated to
purchase Notes at the spreads specified.  Information so provided shall be
representative of potential interest only for the period commencing on the day
such information is provided and ending on the earlier of the fifth Business Day
after such day and the first day after such day on which further spread
information is provided.  Prudential may suspend or terminate providing
information pursuant to this paragraph 2C if, in its sole discretion, it
determines that there has been an adverse change in the credit quality of the
Company after the date of this Agreement.

          2D.  REQUEST FOR PURCHASE.  The Company may from time to time during
the Issuance Period make requests for purchases of Notes (each such request
being a "REQUEST FOR PURCHASE").  Each Request for Purchase shall be made to
Prudential by telecopier and confirmed by nationwide overnight delivery service,
and shall (i) specify the aggregate principal amount of Notes covered thereby,
which shall not be less than $10,000,000 and not be greater than the Available
Facility Amount at the time such Request for Purchase is made, (ii) specify the
principal amounts, final maturities, and installment payment dates and amounts
of the Notes covered thereby, (iii) specify the use of proceeds of such Notes,
(iv) specify the proposed day for the closing of the purchase and sale of such
Notes, which shall be a Business Day during the Issuance Period not less than 10
Business Days and not more than 25 Business Days after the making of such
Request for Purchase, (v) specify the number of the account and the name and
address of the depository institution to which the purchase prices of such Notes
are to be transferred on the Closing Day for such purchase and sale, (vi)
certify that the representations and warranties contained in paragraph 8 are
true on and as of the date of such Request for Purchase except to the extent of
changes caused by the transactions herein contemplated and that there exists on
the date of such Request for Purchase no Event of Default or Default, and (vii)
be substantially in the form of Exhibit B attached hereto.  Each Request for
Purchase shall be in writing and shall be deemed made when received by
Prudential.

          2E.  RATE QUOTES.  Not later than five Business Days after the Company
shall have given Prudential a Request for Purchase pursuant to paragraph 2D,
Prudential may provide (by telephone promptly thereafter confirmed by
telecopier, in each case no earlier than 9:30 A.M. and no later than 1:00 P.M.
New York City local time) interest rate quotes for the several principal
amounts, maturities and installment payment schedules (for Notes with average
lives not to exceed 10 years) of Notes specified in such Request for Purchase.
Each quote shall represent, the fixed interest rate per annum, payable on the
outstanding principal balance of such Notes until such balance shall have become
due and payable, at which Prudential would be willing to purchase such Notes at
100% of the principal amount thereof.

          2F.  ACCEPTANCE.  Within 30 minutes after Prudential shall have
provided any interest rate quotes pursuant to paragraph 2E or such shorter
period as Prudential may specify to the Company at any time, including the time
at which the rate is quoted (such period being the "ACCEPTANCE WINDOW"), the
Company may, subject to paragraph 2G, elect to accept such interest 

                                      -3-
<PAGE>
 
rate quotes as to not less than $10,000,000 aggregate principal amount of the
Notes specified in the related Request for Purchase. Such election shall be made
by an Authorized Officer of the Company notifying Prudential by telephone or
telecopier within the Acceptance Window (but not earlier than 9:30 A.M. or later
than 2:00 P.M., New York City local time) that the Company elects to accept such
interest rate quotes, specifying the Notes (each such Note being an "ACCEPTED
NOTE") as to which such acceptance (an "ACCEPTANCE") relates. The day the
Company gives, and Prudential receives, notice of an Acceptance with respect to
any Accepted Notes is herein called the "ACCEPTANCE DAY" for such Accepted
Notes. Any interest rate quotes as to which Prudential does not receive an
Acceptance within the Acceptance Window shall expire, and no purchase or sale of
Notes hereunder shall be made based on such expired interest rate quotes.
Subject to paragraph 2G and the other terms and conditions hereof, (i) the
Company agrees to sell to Prudential or a Prudential Affiliate, and Prudential
agrees to purchase, or to cause the purchase by a Prudential Affiliate of, the
Accepted Notes (the "PRUDENTIAL ACCEPTED NOTES") as to which interest rate
quotes shall have been provided to the Company for purchases by Prudential or
Prudential Affiliates at 100% of the principal amount of such Notes. Prior to
the close of business on the Business Day next following the Acceptance Day, the
Company and Prudential will execute a confirmation of such Acceptance
substantially in the form of Exhibit C attached hereto (a "CONFIRMATION OF
ACCEPTANCE").

          2G.  MARKET DISRUPTION.  Notwithstanding the provisions of paragraph
2F, if Prudential shall have provided interest rate quotes pursuant to paragraph
2E and thereafter prior to the time notice of an Acceptance with respect to such
quotes shall have been received by Prudential in accordance with paragraph 2F
there shall occur a general suspension, material limitation, or significant
disruption of trading in securities generally on the New York Stock Exchange or
in the market for U.S. Treasury securities and other financial instruments, then
such interest rate quotes shall expire, and no purchase or sale of Notes
hereunder shall be made based on such expired interest rate quotes.  If the
Company thereafter notifies Prudential of the Acceptance of any such interest
rate quotes, such Acceptance shall be ineffective for all purposes of this
Agreement, and Prudential shall promptly notify the Company that the provisions
of this paragraph 2G are applicable with respect to such Acceptance.

          2H.  CLOSING.  Not later than 11:30 A.M. (New York City local time) on
the Closing Day for any Accepted Notes, the Company will deliver to each
Purchaser listed in the Confirmation of Acceptance relating thereto at the
offices of Prudential Capital Group, 1201 Elm St., Suite 4900, Dallas, Texas
75270 the Notes to be purchased by such Purchaser in the form of a single
Accepted Note for the Accepted Notes which have exactly the same terms (or such
greater number of Notes in authorized denominations as such Purchaser may
request) dated the Closing Day and registered in such Purchaser's name (or in
the name of its nominee), against payment of the purchase price thereof by
transfer of immediately available funds for credit to the Company's account
specified in the Request for Purchase of such Notes.  If the Company fails to
tender to any Purchaser the Accepted Notes to be purchased by such Purchaser on
the scheduled Closing Day for such Accepted Notes as provided above in this
paragraph 2H, or any of the conditions specified in paragraph 3 shall not have
been fulfilled by the time required on such scheduled Closing Day, the Company
shall, prior to 1:00 P.M., New York City local time, on such scheduled Closing
Day notify such Purchaser in writing whether (x) such closing is to be
                                              -                       
rescheduled (such rescheduled date to 

                                      -4-
<PAGE>
 
be a Business Day during the Issuance Period not less than one Business Day and
not more than 30 Business Days after such scheduled Closing Day (the
"RESCHEDULED CLOSING DAY") and certify to such Purchaser that the Company
reasonably believes that it will be able to comply with the conditions set forth
in paragraph 3 on such Rescheduled Closing Day and that the Company will pay the
Delayed Delivery Fee in accordance with paragraph 2I(2) or (y) such closing is 
                                                            - 
to be canceled as provided in paragraph 2I(3).  In the event that the Company
shall fail to give such notice referred to in the preceding sentence, such
Purchaser may at its election, at any time after 1:00 P.M., New York City local
time, on such scheduled Closing Day, notify the Company in writing that such
closing is to be canceled as provided in paragraph 2I(3).

          2I.  FEES.

          2I(1)  FACILITY FEE.  The Company paid to Prudential in immediately
available funds a fee (the "FACILITY FEE") on each Closing Day, in an amount
equal to  (i) .30% of the aggregate principal amount of Notes sold on such
Closing Day for the first $150,000,000 of Notes issued pursuant to this
Agreement and (ii) .10% of the aggregated principal amount of Notes sold on such
Closing Day with respect to the remaining $50,000,000 of Notes issued pursuant
to this Agreement.

          2I(2)  DELAYED DELIVERY FEE.  If the closing of the purchase and sale
of any Accepted Note is delayed for any reason (other than, with respect to any
Accepted Note, because the Purchaser of such Accepted Note is prohibited by law
from purchasing an Accepted Note or the Purchaser of such Accepted Notes shall
request a delay in writing) beyond the original Closing Day for such Accepted
Note, the Company will pay to the Purchaser which shall have agreed to purchase
such Accepted Note, on the last Business Day of each calendar month, commencing
with the first such day to occur more than 30 days after the Acceptance Day for
such Accepted Note and ending with the last such day to occur prior to the
Cancellation Date or the actual closing date of such purchase and sale, and on
the Cancellation Date or actual closing date of such purchase and sale (if such
Cancellation Date or closing date occurs more than 30 days after the Acceptance
Day for such Accepted Note), a fee (the "DELAYED DELIVERY FEE") equal to the
product of (i) the amount determined by Prudential to be the amount by which the
            -                                                                   
bond equivalent yield per annum of such Accepted Note exceeds the average
investment rate per annum on alternative investments (this rate (on a bond
equivalent basis) would be, as of the date of this Agreement, the 30-60-90 day
Commercial Paper rate for Prudential, with the exact period being a function of
the actual number of days elapsed) having a maturity date or dates the same as,
or closest to, the Rescheduled Closing Day or Rescheduled Closing Days from time
to time fixed for the delayed delivery of such Accepted Note, (ii) the principal
                                                               --               
amount of such Accepted Note, and (iii) a fraction the numerator of which is
                                   ---                                      
equal to the number of actual days elapsed from and including the 31st day after
the Acceptance Day for such Accepted Note (in the case of the first such payment
with respect to such Accepted Note) or from and including the date of the next
preceding payment (in the case of any subsequent payment with respect to such
Accepted Note) to but excluding the date of such payment, and the denominator of
which is 360.  In no case shall the Delayed Delivery Fee be less than zero.
Nothing contained herein shall obligate any Purchaser to purchase any Accepted
Note on any day other than the Closing Day for such Accepted Note, as the same
may be rescheduled from time to time in compliance with paragraph 2H.

                                      -5-
<PAGE>
 
          2I(3)  CANCELLATION FEE.  If the Company at any time notifies the
Purchaser obligated to purchase any Accepted Note in writing that the Company is
canceling the closing of the purchase and sale of such Accepted Note, or if the
Purchaser obligated to purchase any Accepted Note notifies the Company in
writing under the circumstances set forth in the last sentence of paragraph 2H
that the closing of the purchase and sale of such Accepted Note is to be
canceled, or if the closing of the purchase and sale of such Accepted Note is
not consummated on or prior to the last day of the Issuance Period (the date of
any such notification, or the last day of the Issuance Period, as the case may
be, being the "CANCELLATION DATE"), the Company will, upon demand by such
Purchaser pay such Purchaser in immediately available funds an amount (the
"CANCELLATION FEE") equal to the price increase described in the next sentence
(the "PRICE MOVEMENT") divided by 100 and multiplied by the principal amount of
such Accepted Note.  The Price Movement (expressed in decimals) shall be
calculated by subtracting (a) the bid price at the time of the Acceptance on the
                           -                                                    
Acceptance Day for such Accepted Note of U.S. Treasury securities having a
maturity equal to or closest to the average life of such Accepted Note (as
determined by Prudential) as reported on the display designated as "Page 678" on
the Telerate Service (or such other display as may replace Page 678 on the
Telerate Service), from (b) the ask price at 10:00 A.M. (New York City local
                         -                                                  
time) on the Cancellation Date of such U.S. Treasury securities (as determined
by Prudential in (a) above) as reported on the display designated as "Page 678"
on the Telerate Service (or such other display as may replace Page 678 on the
Telerate Service).  Each price shall be based on a U.S. Treasury security having
a par value of $100.00 and shall be rounded to the second decimal place.  In no
case shall the Cancellation Fee be less than zero.

          2I(4)  STRUCTURING FEE.  The Company paid Prudential a structuring fee
of $75,000 on October 18, 1991 for structuring the Facility.

          2I(5)  EXTENSION FEE.  The Company paid Prudential the first $50,000
installment of the extension fee on June 4, 1993 for extending the Facility.

          PARAGRAPH 3.   CONDITIONS PRECEDENT.

          3.     CONDITIONS OF CLOSING.  The obligation of any Purchaser to
purchase and pay for any Accepted Notes, and the respective obligations of
Prudential to cause the purchase of and payment for any Prudential Accepted
Notes, are subject to the satisfaction, on or before the Closing Day for such
Accepted Notes, of the following conditions:

          3A.    CERTAIN DOCUMENTS.  Each Purchaser shall have received the
following, each dated the Closing Day unless otherwise indicated:

                 (i)  The Notes to be purchased by such Purchaser.

                 (ii)  A certificate of the Secretary or Assistant Secretary of
          the Company certifying (a) the resolutions of the Board of Directors
          of each of the Company and the Guarantors approving this Agreement,
          the Notes and the Guaranties, respectively, and of all documents
          evidencing other necessary corporate action and 

                                      -6-
<PAGE>
 
          governmental approvals, if any, with respect to this Agreement, the
          Notes and the Guaranties, and (b) the names and true signatures of the
          officers of the Company authorized to sign this Agreement and the
          Notes and the other documents to be delivered hereunder.

               (iii)  Certified copies of the Certificate of Incorporation and
          bylaws of the Company.

               (iv)  A favorable opinion of John C. Walter, General Counsel of
          the Company, reasonably satisfactory to such Purchaser and
          substantially in the form of Exhibit D attached hereto and as to such
          other matters as you may reasonably request.  The Company hereby
          directs such counsel to deliver such opinion, agrees that the issuance
          and sale of any Accepted Notes will constitute a reconfirmation of
          such direction, and understands and agrees that each Purchaser
          receiving such an opinion will and is hereby authorized to rely on
          such opinion.

               (v)  A certified copy of the NCNB Agreement and all amendments,
          modifications, consents or waivers with respect thereto.

               (vi)  A certified copy of the 1993 Note Purchase Agreement and
          the 1995 Note Purchase Agreement and all amendments, modifications,
          consents or waivers with respect thereto.

               (vii)  A certified copy of the Receivables Purchase Agreement and
          all amendments, modifications, consents or waivers with respect
          thereto.

               (viii)  A certified copy of each guaranty or security agreement
          guarantying or securing the obligations of the Company under the NCNB
          Agreement and all amendments, modifications, consents or waivers with
          respect thereto.

               (ix)  A copy of each Guaranty dated the date of issue thereof,
     duly executed by each Guarantor, and a Consent of Guarantors to Amendment
     and Restatement if requested by Prudential.

               (x)  A copy of the Intercreditor Agreement dated the date of
     issue thereof, duly executed by each bank that is the beneficiary of a Bank
     Guaranty.

          3B.  REPRESENTATIONS AND WARRANTIES; NO DEFAULT.  The representations
and warranties contained in paragraph 8 shall be true on and as of such Closing
Day, except to the extent of changes caused by the transactions herein
contemplated; there shall exist on such Closing Day no Event of Default or
Default and no Default or Event of Default would result from the issuance of the
Notes to be purchased on such Closing Day; and the Company shall have delivered
to such Purchaser an Officer's Certificate, dated such Closing Day, to both such
effects.

                                      -7-
<PAGE>
 
          3C.  PURCHASE PERMITTED BY APPLICABLE LAWS.  The purchase of and
payment for the Accepted Notes to be purchased by such Purchaser on the terms
and conditions herein provided (including the use of the proceeds of such Notes
by the Company) shall not violate any applicable law or governmental regulation
(including, without limitation, Section 5 of the Securities Act or Regulation G,
T or X of the Board of Governors of the Federal Reserve System) and shall not
subject such Purchaser to any tax, penalty, liability or other onerous condition
under or pursuant to any applicable law or governmental regulation, and such
Purchaser shall have received such certificates or other evidence as it may
reasonably request to establish compliance with this condition.

          3D.  LEGAL MATTERS.  Counsel for such Purchaser, including any special
counsel for the Purchasers retained in connection with the purchase and sale of
such Accepted Notes, shall be satisfied as to all legal matters relating to such
purchase and sale, and such Purchaser shall have received from such counsel
favorable opinions as to such legal matters as it may reasonably request.

          3E.  PROCEEDINGS.  All corporate and other proceedings taken or to be
taken in connection with the transactions contemplated hereby and all documents
incident thereto shall be reasonably satisfactory in substance and form to such
Purchaser, and it shall have received all such counterpart originals or
certified or other copies of such documents as it may reasonably request.

          3F.  AMENDMENT OF CREDIT AGREEMENTS.  The NCNB Agreement shall not
require (or if so required, such conditions shall simultaneously terminate) (i)
the grant of a Lien on any property of the Company or any Subsidiary or (ii) the
delivery of any security agreement or the guaranty or agreement to provide
guaranties of the obligations of the Company under such agreements other than
any Bank Guaranty which is subject to the Intercreditor Agreement and for which
such Purchaser shall have received a Guaranty from the same Guarantor.  In
addition, such agreements shall not require that any lenders party thereto, or
an agent or representative thereof, be named as beneficiary or loss payee on any
insurance policy and all insurance policies of the Company and its Subsidiaries
shall not name any such lender or agent as beneficiary or loss payee.

          3G.  FACILITY FEE PAYMENT.  Prudential shall have received, within one
Business Day of such Closing Day, the applicable Facility Fee for Notes to be
issued on such Closing Day.

          3H.  CONSENT OF BANKS.  The Company shall have received any consent
required by the NCNB Agreement and delivered a copy thereof to each Purchaser.

          PARAGRAPH 4.   PREPAYMENTS.

          4.   PREPAYMENTS.  The Notes shall be subject to prepayment only with
respect to the required prepayments specified in paragraph 4A and the optional
prepayments permitted by paragraph 4B.

          4A.  REQUIRED PREPAYMENTS.  Until the Notes of each Series shall be
paid in full, 

                                      -8-
<PAGE>
 
the Company shall apply to the prepayment of the Notes of such Series, without
premium, the principal amounts specified, if any, in each Note of such Series
and such principal amounts of such Notes, together with interest thereon to the
prepayment dates specified in such Notes, shall become due on such prepayment
dates. The remaining principal amount of such Notes, together with interest
accrued thereon, shall become due on the maturity date of such Notes.

          4B.  OPTIONAL PREPAYMENT WITH YIELD-MAINTENANCE AMOUNT.  The Notes of
each Series shall be subject to prepayment on or after 90 days from the date of
issuance thereof, in whole at any time or from time to time in part (in
multiples of $1,000,000), at the option of the Company, at 100% of the principal
amount so prepaid plus interest thereon to the prepayment date and the Yield-
Maintenance Amount, if any, with respect to each such Note.  If the Company and
the holder of any Note shall prior to the prepayment date designate in writing a
different amount, the amount so designated shall be payable on the prepayment
date in lieu of the Yield-Maintenance Amount with respect to such Note.  Any
partial prepayment of any such Notes pursuant to this paragraph 4B shall be
applied in satisfaction of required payments of principal of such Notes in
inverse order of their scheduled due dates.

          4C.  NOTICE OF OPTIONAL PREPAYMENT.  The Company shall give the holder
of each Note to be prepaid pursuant to paragraph 4B irrevocable written notice
of such prepayment not less than 10 Business Days prior to the prepayment date,
specifying such prepayment date, specifying the aggregate principal amount of
the Notes of the same Series as such Note to be prepaid on such date,
identifying each Note held by such holder, and the principal amount of each such
Note, to be prepaid on such date and stating that such prepayment is to be made
pursuant to paragraph 4B. Notice of prepayment having been given as aforesaid,
the principal amount of the Notes specified in such notice, together with
interest thereon to the prepayment date and together with the Yield-Maintenance
Amount, if any, herein provided, shall become due and payable on such prepayment
date.

          4D.  APPLICATION OF PREPAYMENTS.  In the case of each partial
prepayment pursuant to paragraph 4A or 4B of all outstanding Notes of any
Series, the principal amount to be prepaid shall be allocated to all Notes of
such Series at the time outstanding (including, for the purpose of this
paragraph 4D only, all Notes prepaid or otherwise retired or purchased or
otherwise acquired by the Company or any of its Subsidiaries or Affiliates other
than by prepayment pursuant to paragraph 4A or 4B) in proportion to the
respective outstanding principal amounts thereof.

          4E.  RETIREMENT OF NOTES.  The Company shall not, and shall not permit
any of its Subsidiaries or Affiliates to, prepay or otherwise retire in whole or
in part prior to their stated installment or final maturities (other than by
prepayment pursuant to paragraph 4A or 4B or upon acceleration of such final
maturity pursuant to paragraph 7A), or purchase or otherwise acquire, directly
or indirectly, Notes held by any holder unless the Company or such Subsidiary or
Affiliate shall have offered to prepay or otherwise retire or purchase or
otherwise acquire, as the case may be, the same proportion of the aggregate
principal amount of Notes held by each other holder of Notes at the time
outstanding upon the same terms and conditions.  Any Notes so prepaid or
otherwise retired or purchased or otherwise acquired by the Company or any of
its Subsidiaries or 

                                      -9-
<PAGE>
 
Affiliates shall not be deemed to be outstanding for any purpose under this
Agreement, except as provided in paragraph 4D.

          PARAGRAPH 5.   AFFIRMATIVE COVENANTS.

          5.   AFFIRMATIVE COVENANTS.  So long as any Note shall remain unpaid,
the Company covenants that:

          5A.  FINANCIAL STATEMENTS.  The Company will deliver to the holder of
each Note in duplicate:

               (i)    as soon as practicable and in any event within 45 days
          after the end of each quarterly period (other than the last quarterly
          period) in each fiscal year, a consolidating and consolidated
          statement of operations and statement of cash flows of the Company and
          its Subsidiaries for the period from the beginning of the current
          fiscal year to the end of such quarterly period, and a consolidating
          and consolidated balance sheet of the Company and its Subsidiaries as
          at the end of such quarterly period, setting forth in each case in
          comparative form figures for the corresponding period in the preceding
          fiscal year, all in reasonable detail and certified by an authorized
          financial officer of the Company, subject to changes resulting from
          year-end adjustments; provided, however, that delivery pursuant to
                                --------  -------
          clause (iv) below of copies of the Quarterly Report on Form 10-Q of
          the Company for such quarterly period filed with the Securities and
          Exchange Commission shall be deemed to satisfy the requirements of
          this clause (i) with respect to consolidated financial statements;

               (ii)   as soon as practicable and in any event within 90 days
          after the end of each fiscal year, a consolidating and consolidated
          statement of income and statement of cash flows of the Company and its
          Subsidiaries for such year, and a consolidating and consolidated
          balance sheet of the Company and its Subsidiaries as at the end of
          such year, setting forth in each case in comparative form
          corresponding consolidated figures from the preceding annual audit,
          all in reasonable detail and reasonably satisfactory in scope to the
          Required Holder(s) and, as to the consolidated statements, certified
          to the Company by independent public accountants of recognized
          standing selected by the Company whose certificate shall be in scope
          and substance reasonably satisfactory to the Required Holder(s) and,
          as to the consolidating statements, certified by an authorized
          financial officer of the Company; provided, however, that delivery
                                            --------  -------
          pursuant to clause (iv) below of copies of the Annual Report on Form
          10-K of the Company for such fiscal year filed with the Securities and
          Exchange Commission shall be deemed to satisfy the requirements of
          this clause (ii) with respect to consolidated financial statements;

               (iii)  as soon as practicable, and in any event within 105 days
          after the end of each fiscal year of MIGC, complete consolidated and
          consolidating (if applicable) financial statements of each of MIGC,
          MGTC and any other Subsidiary that owns
                                     -10-
<PAGE>
 
          or operates pipelines subject to state or federal rate regulation and
          has annual revenues in excess of $5,000,000 together with all notes
          thereto, prepared in reasonable detail in accordance with regulations
          promulgated by the Federal Energy Regulatory Commission in the case of
          MIGC and regulations promulgated by the Wyoming Public Service
          Commission in the case of MGTC, together with an opinion regarding
          MIGC, based on audits using generally accepted auditing standards, of
          independent certified public accountants of recognized standing
          stating that such consolidated financial statements have been so
          prepared; such consolidated financial statements shall contain a
          balance sheet as of the end of such fiscal year and statements of
          operations and cash flows, and of changes in stockholders' equity for
          such fiscal year, each setting forth in comparative form the
          corresponding figures for the preceding fiscal year;

               (iv)  promptly upon transmission thereof, copies of all such
          financial statements, proxy statements, press releases, notices and
          reports as it shall send to its public stockholders and copies of all
          registration statements (without exhibits) and all reports which it
          files with the Securities and Exchange Commission (or any governmental
          body or agency succeeding to the functions of the Securities and
          Exchange Commission);

               (v)  prior to April 30 in each year, a projection of the
          consolidated cash flows of the Company, its Subsidiaries and the joint
          ventures in which the Company or its Subsidiaries has an investment
          for the current fiscal year, in the form of Schedule 5A hereto;

               (vi) as soon as delivered to such persons, all other reports,
          statements and notices delivered to (a) the agent, or the other
          lenders under the NCNB Agreement or (b) if the NCNB Agreement is no
          longer in effect, the lenders under the Company's major bank credit
          facility; and

               (vii)  as soon as practicable after receipt thereof, a copy of
          each other report submitted to the Company by independent accountants
          in connection with any annual, interim or special audit made by them
          of the books of the Company at any time during which the Company is
          not required to file periodic reports with the Securities and Exchange
          Commission pursuant to section 13 or 15(d) of the Securities Exchange
          Act of 1934, as amended;

               (viii)  with reasonable promptness, such other information as the
          holder of any Note may reasonably request.

Together with each delivery of financial statements required by clauses (i) and
(ii) above, the Company will deliver to the holder of each Note an Officer's
Certificate demonstrating (with computations in reasonable detail) compliance by
the Company and its Subsidiaries with the provisions of paragraphs 6A(1), 6A(2),
6A(3), 6A(4), 6B, 6C(1), 6C(2), 6C(3), 6C(4), 6C(5), 6C(6) 

                                     -11-
<PAGE>
 
and 6C(7) and stating that there exists no Event of Default or Default, or, if
any Event of Default or Default exists, specifying the nature and period of
existence thereof and what action the Company proposes to take with respect
thereto. Together with each delivery of financial statements required by clause
(ii) above, the Company will deliver to each holder of any Notes a certificate
of such accountants stating that, in making the audit necessary to the
certification of such financial statements, they have obtained no knowledge of
any Event of Default or Default, or, if they have obtained knowledge of any
Event of Default or Default, specifying the nature and period of existence
thereof. Such accountants, however, shall not be liable to anyone by reason of
their failure to obtain knowledge of any Event of Default or Default which would
not be disclosed in the course of an audit conducted in accordance with
generally accepted auditing standards.

          The Company also covenants that forthwith upon the chief executive
officer, chief financial officer, Vice President -- Finance, Executive Vice
President -- General Counsel, Treasurer or President of the Company obtaining
knowledge of an Event of Default or Default, it will deliver to each holder of
any Notes an Officer's Certificate specifying the nature and period of existence
thereof and what action the Company proposes to take with respect thereto.

          5B.  INSPECTION OF PROPERTY.  The Company will permit any Person
designated by the holder of any Note in writing, at such holder's expense, to
visit and inspect any of the properties of the Company and its Subsidiaries
while accompanied by personnel of the Company or a Subsidiary, to examine the
corporate books and financial records of the Company and its Subsidiaries and
make copies thereof or extracts therefrom and to discuss the affairs, finances
and accounts of any of such corporations with the principal officers of the
Company and its independent public accountants, all at such reasonable times and
as often as such holder may reasonably request; provided, that each Person so
                                                --------                     
designated by any holder to visit and inspect any properties shall, by virtue of
such designation, be deemed to have agreed to comply with the Company's on-site
safety procedures that are applicable to such properties.  If at the time of any
such inspection a Default or an Event of Default exists, the Company shall pay
all reasonable out of pocket costs incurred by each holder in connection with
such inspection.

          5C.  COVENANT TO SECURE NOTES EQUALLY.  The Company covenants that, if
it or any Subsidiary shall create or assume any Lien upon any of its property or
assets, whether now owned or hereafter acquired, other than Liens permitted by
the provisions of paragraph 6C(1) (unless prior written consent to the creation
or assumption thereof shall have been obtained pursuant to paragraph 11C), it
will make or cause to be made effective provision whereby the Notes will be
secured by such Lien equally and ratably with any and all other Debt thereby
secured so long as any such other Debt shall be so secured.

          5D.  AGREEMENT ASSUMING LIABILITY ON NOTES.  The Company covenants
that, if at any time any Person should become liable (as co-obligor, endorser,
guarantor or surety), on any other obligation of the Company or any obligation
of any Subsidiary, (other than (i) obligations incurred in the ordinary course
of business evidencing guaranties of gas purchases, transportation fees and
construction contracts, (ii) surety bonds, appeal bonds and construction bonds
(including bonds necessary for right-of-way condemnation and bonds issuable upon
appeals of judgments or 

                                     -12-
<PAGE>
 
in relation to injunctions or temporary restraining orders (incurred in the
ordinary course of business, (iii) letter of credit reimbursement obligations
with respect to letters of credit issued in the ordinary course of business but
not for borrowed money, and (iv) endorsements of negotiable instruments for
collection in the ordinary course of business), the Company will, at the same
time, cause such Person to deliver to each holder of Notes an agreement as shall
be approved by the Required Holders of the Notes of each Series pursuant to
which such Person becomes similarly liable on the Notes.

          5E.  NOTICE OF MATERIAL EVENTS.  The Company will promptly notify each
holder of the Notes of (i) any material adverse change in the Company's
business, property or assets, financial condition or results of operations or
the Company's consolidated financial condition, (ii) the acceleration of the
maturity of any indebtedness owed by the Company or any of its Subsidiaries or
any default by the Company or any of its Subsidiaries under any indenture,
mortgage, agreement, contract or other instrument to which any of them is a
party or by which any of them or any of their properties is bound, if such
acceleration or default would have a material adverse effect upon the Company's
consolidated business, property or assets, financial condition or results of
operations, (iii) any material adverse claim (or any claim of $5,000,000 or
more) asserted against the Company or any of its Subsidiaries or with respect to
the Company's or any Subsidiary's properties, (iv)  the occurrence of any
Termination Event or of any event or condition known to the Company which might
adversely affect the enforceability of this Agreement or any Note and (v) the
filing of any suit or proceeding against the Company or any of its Subsidiaries
in which an adverse decision could have a material adverse effect upon the
Company's or any Subsidiary's business, property or assets, financial condition,
or results of operations.  Upon the occurrence of any of the foregoing the
Company will, and will cause each such Subsidiary to, take all necessary or
appropriate steps to remedy promptly any such material adverse change, Default,
Event of Default or default, to protect against any such adverse claim, to
defend any such suit or proceeding, to remedy any such Termination Event or
event affecting enforceability, and to resolve all controversies on account of
any of the foregoing.

          5F.  MAINTENANCE OF PROPERTIES.  The Company will, and will cause each
of its Subsidiaries to, maintain, preserve, protect and keep all material
property used or useful in the conduct of its business in good condition and in
compliance with all applicable laws, rules and regulations and will from time to
time make all repairs, renewals and replacements needed to enable the business
and operations carried on in connection therewith to be promptly and
advantageously conducted at all times.

          5G.  MAINTENANCE OF EXISTENCE AND QUALIFICATIONS.  The Company will,
and will cause each of its Subsidiaries to, maintain and preserve its corporate
existence and its rights and franchises in full force and effect and will
qualify to do business as a foreign corporation in all states or jurisdictions
where required by applicable law, except where the failure so to qualify will
not have any material adverse effect on the business, property or assets,
financial condition or results of operations of the Company and its
Subsidiaries, taken as a whole.

          5H.  INSURANCE.  The Company will, and will cause each of its
Subsidiaries and each of its Affiliates that is controlled by the Company or its
Subsidiaries to, maintain insurance 

                                     -13-
<PAGE>
 
with responsible and reputable insurance companies or associations in such
amounts covering such risks as is usually carried by companies of similar size
as the Company engaged in similar businesses and owning similar properties in
the same general areas in which the Company or such Subsidiary or Affiliates
operates.

          5I.  COMPLIANCE WITH AGREEMENTS AND LAW.  The Company will, and will
cause each of its Subsidiaries and each of its Affiliates that is controlled by
the Company or its Subsidiaries to, perform all material obligations it is
required to perform under the terms of each indenture, mortgage, deed of trust,
security agreement, lease, franchise, agreement, contract or other instrument or
obligation to which it is a party or by which it or any of its properties is
bound.  The Company will, and will cause each of its Subsidiaries and each of
its Affiliates that is controlled by the Company or its Subsidiaries to, conduct
its business and affairs in compliance with all laws, regulations, and orders
applicable thereto, such compliance to include, without limitation, paying
before the same become delinquent all taxes, assessments and governmental
charges imposed upon it or upon its property except to the extent contested in
good faith by appropriate proceedings and for which adequate reserves have been
established in accordance with generally accepted accounting principles except
where noncompliance would not materially adversely affect the business, property
or assets, financial condition or results of operations of the Company and its
Subsidiaries, taken as a whole.

          5J.  COMPLIANCE WITH ENVIRONMENTAL LAWS.  The Company will, and will
cause each of its Subsidiaries and each of its Affiliates that are controlled by
the Company or its Subsidiaries to, comply in a timely fashion with, or operate
pursuant to valid waivers of the provisions of, all applicable federal, state
and local environmental or pollution-control laws, regulations, orders and
decrees governing, without limitation, the emission of wastewater effluent,
solid and hazardous waste and air pollution, and setting forth general
environmental conditions together with any other applicable requirements for
conducting, on a timely basis, periodic tests and monitoring for contamination
of ground water, surface water, air and land and for biological toxicity of the
aforesaid, and diligently comply with the applicable regulations (except to the
extent such regulations are waived by appropriate governmental authorities) of
the Environmental Protection Agency or other relevant federal, state or local
governmental authority except where noncompliance would not materially adversely
affect the business, property or assets, financial condition or results of
operations of the Company and its Subsidiaries, taken as a whole.  The Company
shall not be deemed to have breached or violated the preceding sentence of this
paragraph 5J if the Company, any Subsidiary or any Affiliate of the Company is
challenging in good faith by appropriate proceedings diligently pursued the
application or enforcement of any such governmental requirements for which
adequate reserves have been established in accordance with generally accepted
accounting principles.  TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, THE
COMPANY AGREES TO INDEMNIFY AND HOLD EACH HOLDER OF NOTES AND THEIR RESPECTIVE
OFFICERS, AGENTS AND EMPLOYEES HARMLESS FROM ANY LOSS, LIABILITY, CLAIM OR
EXPENSES THAT SUCH HOLDER MAY INCUR OR SUFFER AS A RESULT OF A BREACH BY THE
COMPANY, ITS SUBSIDIARIES OR AFFILIATES, AS THE CASE MAY BE, OF THIS COVENANT.

                                     -14-
<PAGE>
 
          5K.  INFORMATION REQUIRED BY RULE 144A.  The Company will, upon the
request of the holder of any Note, provide such holder, and any qualified
institutional buyer designated by such holder, such financial and other
information as such holder may reasonably determine to be necessary in order to
permit compliance with the information requirements of Rule 144A under the
Securities Act in connection with the resale of Notes, except at such times as
the Company is subject to and in compliance with the reporting requirements of
section 13 or 15(d) of the Exchange Act. For the purpose of this paragraph 5K,
the term "qualified institutional buyer" shall have the meaning specified in
Rule 144A under the Securities Act.

          5L.  ERISA.  The Company will promptly pay and discharge, and will
cause its Subsidiaries promptly to pay and discharge, all obligations and
liabilities arising under ERISA of a character which if unpaid or unperformed
might result in the imposition of a lien against any of its property and will
promptly notify the holder of each Note of (i) the occurrence of any reportable
event (as defined in ERISA) which might result in the termination by the PBGC of
any Plan covering any officers or employees of the Company of any Subsidiary,
any benefits of which are, or are required to be, guaranteed by the PBGC, (ii)
receipt of any notice from the PBGC of its intention to seek termination of any
such Plan or appointment of a trustee therefor, and (iii) its intention to
terminate or withdraw from any Plan.  The Company will not, and will not permit
any Subsidiary to, terminate any such Plan or withdraw therefrom unless it shall
be in compliance with all of the terms and conditions of this Agreement after
giving effect to any liability to the PBGC resulting from such termination or
withdrawal.

          5M.  GUARANTIES.  The Company shall require each Subsidiary that
guarantees any obligations of the Company under the NCNB Agreement the 1993 Note
Purchase Agreement or the 1995 Note Purchase Agreement to immediately execute
and deliver to any holder of Notes a Guaranty.  The Company will cause each such
Subsidiary to deliver to each holder of the Notes, simultaneously with its
delivery of such a Guaranty, written evidence satisfactory to the Required
Holder(s) and their counsel that such Subsidiary has taken all corporate or
partnership action necessary to duly approve and authorize its execution,
delivery and performance of such Guaranty and other documents which it is
required to execute.

          PARAGRAPH 6.   NEGATIVE COVENANTS.

          6.   NEGATIVE COVENANTS.  So long as any Note shall remain unpaid, the
Company covenants that:

          6A.  FINANCIAL COVENANTS.  The Company will not permit:

          6A(1).  CONSOLIDATED TANGIBLE NET WORTH.  Consolidated Tangible Net
Worth at any time on or after June 30, 1995 to be less than the sum of (i)
$345,000,000 plus (ii) an amount equal to 50% of Consolidated Net Earnings
earned from June 30, 1995 (to the extent such amount is a positive number) plus
                                                                           ----
(iii) an amount equal to 75% of the net proceeds of any equity offerings after
June 30, 1995.

                                     -15-
<PAGE>
 
          6A(2).  CURRENT RATIO.  The ratio of Consolidated Current Assets to
Consolidated Current Liabilities to be less than 1.0 to 1.0 at any time.  For
the purposes of determining compliance with this paragraph 6A(2), (x)
"Consolidated Current Liabilities" will be calculated without including any
                                                      -------               
payments of principal of any Funded Debt of the Company which are required to be
repaid within one year from the time of calculation and (y) "Consolidated
Current Assets" shall include the amount of funds that are available to be
borrowed under the NCNB Agreement, where "available" means, as of the date of
the determination, the bank parties to the NCNB Agreement are committed to
advance such funds, no default exists under the NCNB Agreement and all
conditions to such banks advancing such funds would be satisfied.  Prudential
acknowledges that the Company currently calculates the current ratio only as of
the end of each calendar month.

          6A(3).  DEBT MAINTENANCE.  Adjusted Consolidated Debt at any time to
exceed (i) from August 31, 1994 through October 31, 1996, 60% of Consolidated
Net Tangible Assets and (ii) at any time after October 31, 1996, 55% of
Consolidated Net Tangible Assets.  In any event, for purposes of determining
compliance with this paragraph 6A(3), Adjusted Consolidated Debt shall include
without limitation all indebtedness included in determining compliance with the
similar covenant in the NCNB Agreement.

          6A(4).  FIXED CHARGE COVERAGE RATIO.  For each fiscal quarter of the
Company, the ratio of (i) the sum of (a) the Consolidated Net Earnings of the
Company for the four immediately preceding fiscal quarters of the Company plus
                                                                          ----
(b) the Company's consolidated interest expense and provision for income taxes,
depreciation and amortization for the four immediately preceding fiscal quarters
of the Company that were taken into account in determining such consolidated
earnings plus (c) for each calculation that includes the Company's fiscal
         ----                                                            
quarter ending June 30, 1995, that certain $2,000,000 restructuring charge taken
by the Company in its fiscal quarter ending June 30, 1995 as a result of the
Company's general and administrative reductions to (ii) the Company's
                                                --                   
consolidated accrued interest expense for the four immediately preceding fiscal
quarters to be less than (x) 3.00 to 1.00 for the period commencing August 31,
1994 and ending October 31, 1996, (y) 3.25 to 1.00 for the period commencing
November 1, 1996 and ending October 31, 1997 and (z) 3.75 to 1.00 at any time
after October 31, 1997.

          6B.     DIVIDEND LIMITATION.  The Company will not make any Restricted
Payment except out of Consolidated Net Earnings Available for Restricted
Payments and unless no Default or Event of Default exists before such Restricted
Payment is made and no Default or Event of Default would exist immediately after
such Restricted Payment is made.

          6C.     LIEN, DEBT, AND OTHER RESTRICTIONS.  The Company will not and
will not permit any Subsidiary to:

          6C(1).  LIENS.  Create, assume or suffer to exist any Lien upon any of
its properties or assets, whether now owned or hereafter acquired (whether or
not provision is made for the equal and ratable securing of the Notes in
accordance with the provisions of Paragraph 5C), except
                                                 ------

                  (i)  Liens for taxes not yet due or which are being actively
          contested in good 

                                     -16-
<PAGE>
 
          faith by appropriate proceedings,

               (ii)  other statutory Liens incidental to the conduct of its
          business or the ownership of its property and assets (including
          landlord liens) that are not incurred in connection with the borrowing
          of money or the obtaining of advances or credit or guaranteeing the
          obligations of a Person, and which do not in the aggregate materially
          detract from the value of its property or assets or materially impair
          the use thereof in the operation of its business,

               (iii)  Liens on property or assets of a Subsidiary to secure
          obligations of such Subsidiary to the Company or a Wholly Owned
          Subsidiary,

               (iv)  existing Liens on property of the Company described in
          Schedule 6C(2) attached hereto and securing Debt permitted by clause
          (iii) of Paragraph 6C(2),

               (v)  in the case of transactions that occur after the date
          hereof, Liens existing on any real property of any corporation at the
          time it becomes a Subsidiary, or existing prior to the time of
          acquisition upon any property acquired by the Company or any
          Subsidiary through purchase, merger or consolidation or otherwise,
          whether or not assumed by the Company or such Subsidiary, or placed on
          property at the time of acquisition by the Company or any Subsidiary
          to secure all or a portion of (or to secure Debt incurred to pay all
          or a portion of) the purchase price thereof, provided that (a) all of
                                                       --------                
          such property is not or shall not thereby become encumbered in any
          amount in excess of the lesser of the cost thereof or Fair Market
          Value thereof and (b) any such Lien shall not encumber any other
          property of the Company or such Subsidiary,

               (vi)  Liens on deposit and other bank accounts of the Company
          created by the right of a lender party to the NCNB Agreement to offset
          obligations of the Company owing under such agreements, respectively,
          against such accounts if, and only if, there is no agreement between
          any such lender and the Company which requires the Company to maintain
          any deposit or other funds in any account with such lender other than
          as provided in (vii) below,

               (vii)  Liens on deposits of the Company under the NCNB Agreement
          to secure the face amount of outstanding letters of credit issued
          pursuant to the NCNB Agreement,

               (viii)  Liens on the Pledged Accounts Receivable securing sales
          or transfers of accounts receivable pursuant to the Permitted
          Securitization Program, and

               (ix)  other Liens on the property of the Company,

provided that the aggregate amount of Debt secured by Liens permitted by clauses
- --------                                                                        
(iv), (v), (viii) 

                                     -16-
<PAGE>
 
(to the extent of the Over-Collateralization Amount) and (ix), together with the
amount of undrawn letters of credit subject to the obligation to provide
deposits referred to in clause (vii), whether or not such deposits have been
provided, does not exceed at any time an amount in excess of 5% of Consolidated
Tangible Net Worth.

          6C(2).  DEBT.  Create, incur, assume or suffer to exist any Debt,
                                                                           
except
- ------

                  (i)  Debt of the Company represented by the Notes,

                  (ii)  Debt of the Company and any Subsidiary secured by Liens
          permitted by the provisions of clause (v) of paragraph 6C(1) provided
                                                                       --------
          that the aggregate amount of such Debt together with all other Debt
          secured by Liens permitted by paragraphs 6C(1)(iv), 6C(1)(ix) and the
          amount of undrawn letters of credit permitted by 6C(1)(viii) does not
          exceed at any time an amount equal to 5% of Consolidated Tangible Net
          Worth,

                  (iii)  Debt of the Company described in Schedule 6C(2)
          attached hereto which shall not be renewed, extended or permitted to
          remain outstanding after the stated maturities thereof,

                  (iv)  Debt of any Subsidiary to the Company or any other
          Wholly Owned Subsidiary, provided that such Debt shall not be
                                   --------
          subordinated to any other obligation of such Subsidiary,

                  (v)  other Debt of the Company not prohibited by 6A(3), and

                  (vi)  Debt of the Guarantors represented by the Bank
          Guaranties and the Guaranties.

          6C(3).  LIMITATION ON INVESTMENTS AND NEW BUSINESSES.  (i) Make any
expenditure or commitment or incur any obligation or enter into or engage in any
transaction except in the ordinary course of business (which shall be deemed to
include expenditures, commitments, obligations and transactions permitted by
clause (iii) or clause (iv) of this paragraph 6C(3)); (ii) engage directly or
indirectly in any business or conduct any operations except in connection with
or incidental to its present businesses and operations (which shall be deemed to
include electric power generation and marketing and expenditures, commitments,
obligations and transactions permitted by clause (iii) or clause (iv) of this
paragraph 6C(3)); (iii) make any acquisitions of, capital contributions to, or
other investments in, any Persons which exceed in the aggregate $500,000 other
than (a) capital contributions to and investments in any joint venture described
in Schedule 6C(3) or in the Wholly Owned Subsidiaries, (b) acquisitions of
equity in corporations or partnerships having as their primary business gas
processing, transmission and gathering, oil and gas production and storage or
gas marketing and related activities or electric power generation or marketing
which do not exceed in the aggregate 10% of Consolidated Net Tangible Assets and
(c) deposits with, investments in obligations of and time deposits in any
domestic bank or domestic 

                                     -18-
<PAGE>
 
branches of foreign banks which, at the time such deposit or investment is made,
are rated A or better by Standard & Poor's Rating Group or Moody's Investor
Service, Inc. or B or better by Thompson Bank Watch and investments maturing
within one year from the date of acquisition in direct obligations of or
obligations supported by, the full faith and credit of, the United States of
America or (iv) make any significant acquisitions or investments in any
properties other than gas processing, transmission and gathering facilities,
domestic oil and gas properties, gas storage facilities, gas inventory and
electric power generation facilities which exceeds $5,000,000; provided, 
                                                               --------  
however, that the loans referred to in clause (iv) of paragraph 6C(7) may be 
- -------                                                              
outstanding.

          6C(4).  SALE OF STOCK AND DEBT OF SUBSIDIARIES.  Sell or otherwise
dispose of, or part with control of, any shares of stock or Debt of any
Subsidiary, except to the Company or another Wholly Owned Subsidiary, and except
that all shares of stock and Debt of any Subsidiary at the time owned by or owed
to the Company and all Subsidiaries may be sold as an entirety for a cash
consideration which represents the fair value (as determined in good faith by
the Board of Directors of the Company) at the time of sale of the shares of
stock and Debt so sold, provided that (i) the assets of such Subsidiary together
                        --------                                                
with (ii) the assets of all other Subsidiaries the stock or Debt of which was
sold or otherwise disposed of in the preceding 12-month period and (iii) the
assets of the Company and its Subsidiaries sold, leased, transferred or
otherwise disposed of pursuant to clause (v) of paragraph 6C(5) in the preceding
12-month period (in each transaction measured by the greater of book value or
Fair Market Value), do not represent more than 15% of Consolidated Net Tangible
Assets as reflected on the most recent annual or quarterly consolidated balance
sheet, and provided further that, at the time of such sale, such Subsidiary
           -------- -------                                                
shall not own, directly or indirectly, any shares of stock or Debt of, or any
other continuing investment in any other Subsidiary (unless all of the shares of
stock and Debt of such other Subsidiary owned, directly or indirectly, by the
Company and all Subsidiaries are simultaneously being sold as permitted by this
paragraph 6C(4)), or any shares of stock or Debt of the Company.

          6C(5).  MERGER AND SALE OF ASSETS.  Merge or consolidate with or into
any other Person or sell, convey, lease, transfer or otherwise dispose of all or
any part of its assets, except that:
                        ------      

               (i)  (a) any Subsidiary may merge with the Company (provided,
                                                                   -------- 
          that the Company shall be the continuing or surviving corporation) and
          (b) any Subsidiary may merge with a Wholly Owned Subsidiary (provided
                                                                       --------
          that the Wholly Owned Subsidiary shall be the continuing or surviving
          corporation),

               (ii)  any Subsidiary may sell, lease, transfer or otherwise
          dispose of any of its assets to the Company or to Wholly Owned
          Subsidiary,

               (iii)  the Company may merge with any other corporation, provided
                                                                        --------
          that (a) the Company shall be the continuing or surviving corporation,
          and (b) immediately after giving effect to such merger no Event of
          Default or Default shall exist,

               (iv)  any non Wholly Owned Subsidiary may merge or consolidate
          with any other corporation, provided, that immediately after giving
                                      --------                               
          effect to such merger or 

                                     -19-
<PAGE>
 
          consolidation (a) the continuing or surviving corporation of such
          merger or consolidation shall constitute a Subsidiary, and (b) no
          Event of Default or Default shall exist,

               (v)  the Company or any Subsidiary may sell, lease, transfer or
          otherwise dispose of any of its assets to any Person, provided, that
                                                                --------      
          (a) such assets together with (b) all other assets of the Company and
          its Subsidiaries sold, leased, transferred or otherwise disposed of
          during the preceding 12-month period, and (c) the assets of all
          Subsidiaries the stock or Debt of which has been sold or otherwise
          disposed of during the preceding 12-month period pursuant to the first
          proviso of paragraph 6C(4) (in each transaction measured by the
          greater of book value or Fair Market Value), do not represent more
          that 15% of Consolidated Net Tangible Assets as reflected on the most
          recent annual or quarterly consolidated balance sheet,

               (vi)  the Company may merge into or consolidate with any solvent
          corporation if (x) the surviving corporation is a corporation
          organized under the laws of any State of the United States of America,
          (y) such corporation shall expressly assume by an agreement
          satisfactory in substance and form to the Required Holders of all
          Series of Notes (which agreement may require the delivery in
          connection with such assumption of such opinions of counsel as the
          Required Holders may reasonably require), all of the obligations of
          the Company under this Agreement and the Notes, including all
          covenants herein and therein contained, and such successor or
          acquiring corporation shall succeed to and be substituted for the
          Company with the same effect as if it had been named herein as a party
          hereto (it being agreed that such assumption shall, upon the request
          of the holder of any outstanding Note and at the expense of such
          successor corporation, be evidenced by the exchange of such Note for
          another Note executed by such successor corporation, with such changes
          in phraseology and form as may be appropriate but in substance of like
          terms as the Note surrendered for such exchange and of like unpaid
          principal amount, and that each Note executed pursuant to paragraph
          11D after such assumption shall be executed by and in the name of such
          successor corporation) and (z) after giving effect to such merger or
          consolidation no Event of Default or Default shall exist,

               (vii)   the Company and any Subsidiary may sell or otherwise
          dispose of property (including inventory) in the ordinary course of
          business, and

               (viii)  the Company may sell Pledged Accounts Receivables
          pursuant to the Permitted Securitization Program in an aggregate
          amount not to exceed $75,000,000.

          6C(6).  LEASE RENTALS.  Except for oil, gas and mineral leases or
permits or similar agreements entered into in the ordinary course of business,
and except for leases for transportation equipment, including over-the-road
trucks and tankers, data processing and other office equipment used in the
ordinary course of business, enter into or permit to remain in effect, any
agreements to rent or lease (as lessee) any real or personal property for terms
(including options to renew or extend 

                                     -20-
<PAGE>
 
any term, whether or not exercised) of more than three years if after giving
effect thereto the aggregate amount of all sums payable in any fiscal year by
the Company and all Subsidiaries under all such leases would exceed $4,000,000.

          6C(7).  LIMITATION ON CREDIT EXTENSIONS.  Extend credit, make advances
or make loans other than (i) normal and prudent extensions of credit in the
ordinary course of business, which extensions shall not be for longer periods
than those extended by similar businesses operated in a normal and prudent
manner, (ii) loans from Wholly Owned Subsidiaries to the Company, and loans from
Wholly Owned Subsidiaries or the Company to any Subsidiary, in each case made in
the ordinary course of business and, in the case of loans from Wholly Owned
Subsidiaries that have not executed a Guaranty which are made to the Company or
a Subsidiary that has executed a Guaranty, subordinated to the principal of,
interest on and Yield-Maintenance Amount, if any, with respect to the Notes, and
(iii) loans made by the Company to its employees pursuant to the Stock Option
Agreements; provided that the aggregate amount of all such loans permitted by
            --------                                                         
this clause (iii) outstanding at any time shall not exceed $10,000,000.

          6C(8).  CONTRACTS; TAKE-OR-PAY AGREEMENTS.  Enter into any "take-or-
pay" contract or other contract which requires it to pay for oil, gas, other
hydrocarbons or other minerals prior to taking delivery thereof, provided that
                                                                 --------     
the Company may enter into such contracts so long as the aggregate maximum
direct and contingent liability of the Company under such contracts does not
exceed $500,000 at any one time, and provided further that the Company may enter
                                     -------- -------                           
into contracts with gas producers requiring the Company to make payments if the
Company has not connected the producer's well to the Company's gathering system
within a specified period of time so long as the maximum direct or contingent
liability of the Company under such contract does not exceed $500,000.  The
Company and its Subsidiaries may enter into:  (a) Short Hedge Futures to sell
natural gas or liquid hydrocarbons or to offset a Long Hedge Future; and (b)
Long Hedge Futures to purchase natural gas or liquid hydrocarbons or to offset a
Short Hedge Future; provided, however, that at the time of entering into a Short
                    --------  -------                                           
Hedge Future, the Company shall own and have available to it sufficient amounts
of natural gas or liquid hydrocarbons, as the case may be, or shall own pursuant
to firm contracts to deliver natural gas or liquid hydrocarbons, as the case may
be, pursuant to such Short Hedge Future; provided, further, that at the time of
                                         --------  -------                     
entering into a Long Hedge Future, the Company shall have sufficient agreements
from Counterparties to purchase natural gas or liquid hydrocarbons, as the case
may be, from the Company so that the Company can resell natural gas or liquid
hydrocarbons, as the case may be, delivered pursuant to such Long Hedge Future.

          6C(9).  SALE OR DISCOUNT OF RECEIVABLES.  Sell with recourse, or
discount (other than to the extent of finance and interest charges included
therein) or otherwise sell for less than face value thereof, any of its notes or
accounts receivable except (i) notes or accounts receivable the collection of
                    ------                                                   
which is doubtful in accordance with generally accepted accounting principles
and (ii) pursuant to the Permitted Securitization Program; provided, however,
                                                           --------  ------- 
that the Company and its Subsidiaries may not have more than one Permitted
                                          ---                             
Securitization Program outstanding at any time.

          6C(10).  GUARANTIES.  Enter into or be party to:

                                     -21-
<PAGE>
 
               (i)  any contract for the purchase of materials, supplies or
          other property or services if such contract (or any related document)
          requires that payment for such materials, supplies or other property
          or services shall be made regardless of whether or not delivery of
          such materials, supplies or other property or services is ever made or
          tendered, or

               (ii)  any contract to rent or lease (as lessee) any real or
          personal property if such contract (or any related document) provides
          that the obligation to make payments thereunder is absolute and
          unconditional under conditions not customarily found in commercial
          leases then in general use or requires that the lessee purchase or
          otherwise acquire securities or obligations of the lessor, or

               (iii)  any contract for the sale or use of materials, supplies or
          other property, or the rendering of services, if such contract (or any
          related document) requires that payment for such materials, supplies
          or other property, or the use thereof, or payment for such services,
          shall be subordinated to any indebtedness (of the purchaser or user of
          such materials, supplies or other property or the Person entitled to
          the benefit of such services) owed or to be owed to any Person, or

               (iv)  any other contract that is a guaranty, an endorsement or
          another form of contingent liability in respect of the obligations,
          stock or dividends of any Person or that, in economic effect, is
          substantially equivalent to a guaranty (other than the guaranties
          permitted by clause (vi) of paragraph 6C(2)); provided, that the
                                                        --------          
          foregoing provisions shall not apply to endorsements of negotiable
          instruments for collection in the ordinary course of business;

provided, that, notwithstanding the foregoing, any contract of the type
- --------                                                               
specified in any of the provisions of this paragraph 6C(10) shall be permitted
if the obligations of the Company thereunder constitute Debt of the type
described in clause (iv) of the definition thereof and such Debt were permitted
by the Debt limitations contained in paragraph 6A(3).

          6C(11).  TRANSACTIONS WITH AFFILIATES.  Directly or indirectly,
purchase, acquire or lease any property from, or sell, transfer or lease any
property to, or otherwise deal with, in the ordinary course of business or
otherwise (i) any Affiliate, (ii) any Person owning, beneficially or of record,
directly or indirectly, either individually or together with all other Persons
to whom such Person is related by blood, adoption or marriage, stock of the
Company (of any class having ordinary voting power for the election of
directors) aggregating 5% or more of such voting power or (iii) any Person
related by blood, adoption or marriage to any Person described or coming within
the provisions of clause (i) or (ii) of this paragraph 6C(11), provided that the
Company may sell to, or purchase (within the limitations of paragraph 6B) from,
any such Person shares of the Company's stock and except for transactions that
are otherwise permitted by this Agreement and that are in the ordinary course of
the Company's or a Subsidiary's business, and are also upon fair and reasonable
terms no less favorable to the Company or such Subsidiary than it would obtain
in a comparable arm's-length transaction with a Person not an Affiliate.

                                     -22-
<PAGE>
 
          6C(12).  PANHANDLE JOINT VENTURE DEBT.  Permit the Panhandle Joint
Venture to create, incur, assume or suffer to exist any Debt.

          6D.  ISSUANCE OF STOCK BY SUBSIDIARIES.  The Company covenants that it
will not permit any Subsidiary to issue, sell or dispose of any shares of its
stock of any class except to the Company or a Wholly Owned Subsidiary, and
except to the extent that holders of minority interests may be entitled to
purchase stock by reason of preemptive rights.

          6E.  OTHER AGREEMENTS.  Without the prior written consent of the
Required Holder(s) of each Series of Notes, the Company will not amend, modify
or waive (i) any provision of the Term Loan Agreement which would shorten the
maturity or average life of any loan thereunder, (ii) any provision of the
Revolving Loan Agreement which would shorten any commitment thereunder, or (iii)
any provision of the 1993 Note Purchase Agreement or the 1995 Note Purchase
Agreement which would shorten the maturity or average life of any note issued
thereunder.

          PARAGRAPH 7.   EVENTS OF DEFAULT.

          7A.  ACCELERATION.  If any of the following events shall occur for any
reason whatsoever and be continuing (and whether such occurrence shall be
voluntary or involuntary or come about or be effected by operation of law or
otherwise):

               (i)    the Company defaults in the payment of any principal of or
     Yield Maintenance Amount payable with respect to any Note when the same
     shall become due, either by the terms thereof or otherwise as herein
     provided; or

               (ii)   the Company defaults in the payment of any interest on any
     Note for more than 10 Business Days after the date due; or

               (iii)  the Company or any Subsidiary defaults (whether as primary
     obligor or as guarantor or other surety) in any payment of principal of or
     interest on any other obligation for money borrowed (or any Capitalized
     Lease Obligation, any obligation under a conditional sale or other title
     retention agreement, any obligation issued or assumed as full or partial
     payment for property whether or not secured by a purchase money mortgage or
     any obligation under notes payable or drafts accepted representing
     extensions of credit) beyond any period of grace provided with respect
     thereto, or the Company or any Subsidiary fails to perform or observe any
     other agreement, term or condition contained in any agreement under which
     any such obligation is created (or if any other event thereunder or under
     any such agreement shall occur and be continuing) and the effect of such 
     failure or other event is to cause, or to permit the holder or holders of
     such obligation (or a trustee on behalf of such holder or holders) to
     cause, such obligation to become due (or to be repurchased by the Company
     or any Subsidiary) prior to any stated maturity, provided that the 
                                                      --------         
     aggregate amount of all obligations as to which such a payment default
     shall occur

                                     -23-
<PAGE>
 
          and be continuing or such a failure or other event causing or
          permitting acceleration (or resale to the Company or any Subsidiary)
          shall occur and be continuing exceeds $10,000,000; or

               (iv)  any representation or warranty made by the Company herein,
          by any Guarantor in a Guaranty or by the Company, any Guarantor or any
          of their respective officers in any writing furnished in connection
          with or pursuant to this Agreement shall be false in any material
          respect on the date as of which made; or

               (v)  the Company fails to perform or observe any term, covenant
          or agreement contained in paragraph 6; or

               (vi)  the Company fails to perform or observe any other
          agreement, covenant, term or condition contained herein and such
          failure shall not be remedied within 30 days after the Chief Executive
          Officer, President, Chief Financial Officer, Vice President --
          Finance, Treasurer or the Executive Vice President -- General Counsel
          of the Company obtains actual knowledge thereof; or

               (vii)  the Company or any Subsidiary makes an assignment for the
          benefit of creditors or is generally not paying its debts as such
          debts become due; or

               (viii)  any decree or order for relief in respect of the Company
          or any Subsidiary is entered under any bankruptcy, reorganization,
          compromise, arrangement, insolvency, readjustment of debt, dissolution
          or liquidation or similar law, whether now or hereafter in effect
          (herein called the "BANKRUPTCY LAW"), of any jurisdiction; or

               (ix)  the Company or any Subsidiary petitions or applies to any
          tribunal for, or consents to, the appointment of, or taking possession
          by, a trustee, receiver, custodian, liquidator or similar official of
          the Company or any Subsidiary, or of any substantial part of the
          assets of the Company or any Subsidiary, or commences a voluntary case
          under the Bankruptcy Law of the United States or any proceedings
          (other than proceedings for the voluntary liquidation and dissolution
          of a Subsidiary) relating to the Company or any Subsidiary under the
          Bankruptcy Law of any other jurisdiction; or

               (x)  any such petition or application is filed, or any such
     proceedings are commenced, against the Company or any Subsidiary and the
     Company or such Subsidiary by any act indicates its approval thereof,
     consent thereto or acquiescence therein, or an order, judgment or decree is
     entered appointing any such trustee, receiver, custodian, liquidator or
     similar official, or approving the petition in any such proceedings, and
     such order, judgment or decree remains unstayed and in effect for more than
     30 days; or

                                     -24-
<PAGE>
 
               (xi)  any order, judgment or decree is entered in any proceedings
          against the Company decreeing the dissolution of the Company and such
          order, judgment or decree remains unstayed and in effect for more than
          60 days; or

               (xii)  any order, judgment or decree is entered in any
          proceedings against the Company or any Subsidiary decreeing a split-up
          of the Company or such Subsidiary which requires the divestiture of
          assets representing a substantial part, or the divestiture of the
          stock of a Subsidiary whose assets represent a substantial part, of
          the consolidated assets of the Company and its Subsidiaries
          (determined in accordance with generally accepted accounting
          principles) or which requires the divestiture of assets, or stock of a
          Subsidiary, which shall have contributed a substantial part of the
          Consolidated Net Earnings of the Company and its Subsidiaries
          (determined in accordance with generally accepted accounting
          principles) for any of the three fiscal years then most recently
          ended, and such order, judgment or decree remains unstayed and in
          effect for more than 60 days; or

               (xiii)  any judgment or order, or series of judgments or orders,
          for the payment of money in an amount in excess of $5,000,000 is
          rendered against the Company or any Subsidiary and either (i)
          enforcement proceedings have been commenced by any creditor upon such
          judgment or order or (ii) within 30 days after entry thereof, such
          judgment is not discharged or execution thereof stayed pending appeal,
          or within 30 days after the expiration of any such stay, such judgment
          is not discharged; or

               (xiv)  (a) the Company or any other Person who is a member of the
          Company's "control group" (as such term is defined under ERISA) fails
          to make all or any portion of a required installment payment under 29
          U.S.C. (S)1082(e) with respect to any Plan, (b) the aggregate unpaid
          balance of such installment together with the unpaid balance of all
          prior installments and other payments due under 29 U.S.C. (S)1082
          (including any accrued interest on such amounts) exceeds $1,000,000,
          and (c) such amounts remain unpaid for more than 30 days after the due
          date of the installment referred to in clause (a); or

               (xv)  the Company or any of its Affiliates as employer under a
          Multiemployer Plan shall have made a complete or partial withdrawal
          from such Multiemployer Plan and the plan sponsor of such
          Multiemployer Plan shall have notified such withdrawing employer that
          such employer has incurred a withdrawal liability in an annual amount
          exceeding $1,000,000; or

               (xvi)  the Company or any Affiliate breaches or defaults in the
          performance of any agreement or instrument creating or evidencing any
          Permitted Securitization Program or breaches or defaults in the
          performance of any prefunding facility associated therewith, and any
          such breach or default continues beyond any applicable period of grace
          provided therefor, or any early or accelerated amortization of any

                                     -25-

<PAGE>
 
          obligations or rights commences to occur under any such facility
          without a replacement facility (on terms consistent with those set
          forth in paragraph 6C(9) being effective to provide for replacement
          funding therefore;

then (a) if such event is an Event of Default specified in clause (viii), (ix)
      -                                                                       
or (x) of this paragraph 7A with respect to the Company, all of the Notes at the
time outstanding shall automatically become immediately due and payable at par
together with interest accrued thereon, without presentment, demand, protest or
notice of any kind (including, without limitation, notice of intent to
accelerate and notice of acceleration of maturity), all of which are hereby
waived by the Company, (b) if such event is an Event of Default specified in
                        -                                                   
clause (i) or (ii) of this paragraph 7A, any Significant Holder that holds a
Note other than the Company or any of its Subsidiaries or Affiliates) as to
which such an Event of Default shall have occurred may at its option during the
continuance of such Event of Default, by notice in writing to the Company,
declare such Note to be, and  such Note shall thereupon be and become,
immediately due and payable together with interest accrued thereon and together
with the Yield-Maintenance Amount, if any, with respect to each such Note,
without presentment, demand, protest or notice of any kind (including, without
limitation, notice of intent to accelerate), all of which are hereby waived by
the Company, (c) if such event is any other Event of Default, the Required
              -                                                           
Holder(s) of the Notes of any Series may at its or their option during the
continuance of such Event of Default, by notice in writing to the Company,
declare all of the Notes of such Series to be, and all of the Notes of such
Series shall thereupon be and become, immediately due and payable together with
interest accrued thereon and together with the Yield-Maintenance Amount, if any,
with respect to each Note of such Series, without presentment, demand, protest
or notice of any kind (including, without limitation, notice of intent to
accelerate), all of which are hereby waived by the Company, and (d) if any Note
                                                                 -             
shall have been declared to be due and payable pursuant to clause (b) or (c)
above, any holder of any other Note may at any time thereafter, regardless of
whether any Event of Default shall at such time be continuing, by notice in
writing to the Company, declare all of the Notes held by such holder to be, and
all of the Notes held by such holder shall thereupon be and become, immediately
due and payable together with interest accrued thereon and together with the
Yield-Maintenance Amount, if any, with respect to each such Note, without
presentment, demand, protest or notice of any kind (including, without
limitation, notice of intent to accelerate), all of which are hereby waived by
the Company.  The Company acknowledges and the parties hereto agree, that the
holder of each Note has the right to maintain its investment in the Notes free
from repayment by the Company (except as herein specifically provided for) and
the provisions for payment of the Yield-Maintenance Amount by the Company in the
event that the Notes are prepaid or are accelerated as a result of an Event of
Default, are intended to provide compensation for the deprivation of such right
under such circumstances.

          7B.  RESCISSION OF ACCELERATION.  At any time after any or all of the
Notes of any Series are declared immediately due and payable and have not been
paid in full, the Required Holder(s) of such Series of Notes may, by notice in
writing to the Company, rescind and annul such declaration and its consequences
if (i) the Company has paid all overdue interest on the Notes, the principal of
and Yield Maintenance Amount, if any, payable with respect to any Notes which
have become due otherwise than by reason of such declaration, and interest on
such overdue interest and overdue principal and Yield-Maintenance Amount at the
rate specified in the Notes, (ii) all Events 

                                     -26-
<PAGE>
 
of Default and Defaults, other than non-payment of amounts which have become due
solely by reason of such declaration have been cured or waived pursuant to
paragraph 11C, and (iii) no judgment or decree has been entered for the payment
of any monies due pursuant to the Notes or this Agreement. No such rescission or
annulment shall extend to or affect any subsequent Event of Default or Default
or impair any right arising therefrom.

          7C.  NOTICE OF ACCELERATION OR RESCISSION.  Whenever any Note shall be
declared immediately due and payable pursuant to paragraph 7A or any such
declaration shall be rescinded and annulled pursuant to paragraph 7B, the
Company shall forthwith give written notice thereof to the holder of each Note
at the time outstanding.

          7D.  OTHER REMEDIES.  If any Event of Default or Default shall occur
and be continuing, the holder of any Note may proceed to protect and enforce its
rights under this Agreement and such Note by exercising such remedies as are
available to such holder in respect thereof under applicable law, either by suit
in equity or by action at law, or both, whether for specific performance of any
covenant or other agreement contained in this Agreement or in aid of the
exercise of any power granted in this Agreement.  No remedy conferred in this
Agreement upon the holder of any Note is intended to be exclusive of any other
remedy, and each and every such remedy shall be cumulative and shall be in
addition to every other remedy conferred herein or now or hereafter existing at
law or in equity or by statute or otherwise.

          PARAGRAPH 8.   REPRESENTATIONS, COVENANTS AND WARRANTIES.

          8.   REPRESENTATIONS, COVENANTS AND WARRANTIES.  The Company
represents, covenants and warrants as follows:

          8A.  ORGANIZATION.  The Company is a corporation duly organized and
existing in good standing under the laws of the State of Delaware, each
Subsidiary is duly organized and existing in good standing under the laws of the
jurisdiction in which it is incorporated, and the Company has and each
Subsidiary has the corporate power to own its respective property and to carry
on its respective business as now being conducted.  The execution, delivery and
performance by the Company of this Agreement and the Notes are within the
Company's corporate powers and have been duly authorized by all necessary
corporate action.

          8B.  FINANCIAL STATEMENTS.  The Company has furnished each Purchaser
of any Accepted Notes with the following financial statements, identified by a
principal financial officer of the Company:  (i) a consolidated balance sheet of
                                              -                                 
the Company and its Subsidiaries as at December 31 in each of the three fiscal
years of the Company most recently completed prior to the date as of which this
representation is made or repeated to such Purchaser (other than fiscal years
completed within 90 days prior to such date for which audited financial
statements have not been released) and a consolidated statement of income and
statement of cash flows of the Company and its Subsidiaries for each such year,
all certified by the Company's then-current nationally recognized independent
auditing firm; and (ii) consolidated balance sheets of the Company and its
                    --                                                    
Subsidiaries 

                                     -27-
<PAGE>
 
as at the end of the quarterly period (if any) most recently completed prior to
such date and after the end of such fiscal year (other than quarterly periods
completed within 45 days prior to such date for which financial statements have
not been released) and the comparable quarterly period in the preceding fiscal
year and consolidated statements of income and statements of cash flows for the
periods from the beginning of the fiscal years in which such quarterly periods
are included to the end of such quarterly periods, prepared by the Company. Such
financial statements (including any related schedules and/or notes) are true and
correct in all material respects (subject, as to interim statements, to changes
resulting from audits and year-end adjustments), have been prepared in
accordance with generally accepted accounting principles consistently followed
(except as set forth in the notes thereto if consistent with generally accepted
accounting principles and generally accepted auditing standards) throughout the
periods involved and show all liabilities, direct and contingent, of the Company
and its Subsidiaries required to be shown in accordance with such principles.
The balance sheets fairly present the condition of the Company and its
Subsidiaries as at the dates thereof, and the statements of income and
statements of cash flows fairly present the results of the operations of the
Company and its Subsidiaries for the periods indicated. There has been no
material adverse change in the business, condition or operations (financial or
otherwise) of the Company and its Subsidiaries taken as a whole since the end of
the most recent fiscal year for which such audited financial statements have
been furnished.

          8C.  ACTIONS PENDING.  There is no action, suit, investigation or
proceeding pending or, to the knowledge of the Company, threatened against the
Company or any of its Subsidiaries, or any properties or rights of the Company
or any of its Subsidiaries, by or before any court, arbitrator or administrative
or governmental body which might result in any material adverse change in the
business, condition or operations of the Company and its Subsidiaries taken as a
whole.  There is no action, suit, investigation or proceeding pending or
threatened against the Company or any of its Subsidiaries which purports to
affect the validity or enforceability of this Agreement or any Note.

          8D.  OUTSTANDING DEBT.  Neither the Company nor any of its
Subsidiaries has outstanding any Debt except as permitted by paragraph 6C(2).
There exists no default under the provisions of any instrument evidencing such
Debt or of any agreement relating thereto.

          8E.  ENVIRONMENTAL COMPLIANCE.  The Company and its Subsidiaries and
all of their respective properties and facilities have complied at all times and
in all respects with all federal, state, local and regional statutes, laws,
ordinances and judicial and administrative orders, judgments, rulings and
regulations relating to protection of the environment except, in any such case,
where failure to comply would not result in a material adverse effect on the
business, condition (financial or otherwise) or operations of the Company and
its Subsidiaries taken as a whole.

          8F.  TAXES.  The Company has and each of its Subsidiaries has filed
all Federal, State and other income tax returns which, to the best knowledge of
the officers of the Company and its Subsidiaries, are required to be filed, and
each has paid all taxes as shown on such returns and on all assessments received
by it to the extent that such taxes have become due, except such taxes as are
being contested in good faith by appropriate proceedings and for which adequate
reserves 

                                     -28-
<PAGE>
 
have been established in accordance with generally accepted accounting
principles.

          8G.  CONFLICTING AGREEMENTS AND OTHER MATTERS.  Neither the Company
nor any of its Subsidiaries is a party to any contract or agreement or subject
to any charter or other corporate restriction which materially and adversely
affects its business, property or assets, or financial condition.  Neither the
execution nor delivery of this Agreement or the Notes, nor the offering,
issuance and sale of the Notes, nor fulfillment of nor compliance with the terms
and provisions hereof and of the Notes will conflict with, or result in a breach
of the terms, conditions or provisions of, or constitute a default under, or
result in any violation of, or result in the creation of any Lien upon any of
the properties or assets of the Company or any of its Subsidiaries pursuant to,
the charter or by-laws of the Company or any of its Subsidiaries, any award of
any arbitrator or any agreement (including any agreement with stockholders),
instrument, order, judgment, decree, statute, law, rule or regulation to which
the Company or any of its Subsidiaries is subject.  Neither the Company nor any
of its Subsidiaries is a party to, or otherwise subject to any provision
contained in, any instrument evidencing indebtedness of the Company or such
Subsidiary, any agreement relating thereto or any other contract or agreement
(including its charter) which limits the amount of, or otherwise imposes
restrictions on the incurring of, Debt of the Company of the type to be
evidenced by the Notes except as set forth in the agreements listed in Exhibit E
attached hereto.

          8H.  OFFERING OF NOTES.  Neither the Company nor any agent acting on
its behalf has, directly or indirectly, offered the Notes or any similar
security of the Company for sale to, or solicited any offers to buy the Notes or
any similar security of the Company from, or otherwise approached or negotiated
with respect thereto with, any Person other than institutional investors, and
neither the Company nor any agent acting on its behalf has taken or will take
any action which would subject the issuance or sale of the Notes to the
provisions of Section 5 of the Securities Act or to the provisions of any
securities or Blue Sky law of any applicable jurisdiction.

          8I.  REGULATION G, ETC.   The proceeds of the sale of the Notes will
be used to refinance existing indebtedness or for general corporate purposes.
None of the proceeds of the sale of any Notes will be used, directly or
indirectly, for the purpose, whether immediate, incidental or ultimate, of
purchasing or carrying any "margin stock" as defined in Regulation G (12 CFR
Part 207) of the Board of Governors of the Federal Reserve System (herein called
"margin stock") or for the purpose of maintaining, reducing or retiring any
indebtedness which was originally incurred to purchase or carry any stock that
is then currently a margin stock or for any other purpose which might constitute
the purchase of such Notes a "purpose credit" within the meaning of such
Regulation G, unless the Company shall have delivered to the Purchaser which is
purchasing such Notes, on the Closing Day for such Notes, an opinion of counsel
satisfactory to such Purchaser stating that the purchase of such Notes does not
constitute a violation of such Regulation G.  After applying the proceeds of the
sale of the Notes, not more than 25% of the value of the assets subject to the
terms of paragraph 5C, 6C(1), 6C(4) or 6C(5) will be "margin stock."  Neither
the Company nor any agent acting on its behalf has taken or will take any action
which might cause this Agreement or the Notes to violate Regulation G,
Regulation T or any other regulation of the Board of Governors of the Federal
Reserve System or to violate the Exchange Act, in each case as in effect now or
as the same may hereafter be in effect.

                                     -29-
<PAGE>
 
          8J.  ERISA.  No accumulated funding deficiency (as defined in section
302 of ERISA and section 412 of the Code), whether or not waived, exists with
respect to any Plan (other than a Multiemployer Plan).  No liability to the PBGC
has been or is expected by the Company to be incurred with respect to any Plan
(other than a Multiemployer Plan) by the Company or any of its Subsidiaries
which is or would be materially adverse to the Company and its Subsidiaries
taken as a whole.  Neither the Company nor any of its Subsidiaries has incurred
or presently expects to incur any withdrawal liability under Title IV of ERISA
with respect to any Multiemployer Plan which is or would be materially adverse
to the Company and its Subsidiaries taken as a whole.  No Plan providing welfare
benefits to retired former employees of the Company or any of its Subsidiaries
has been established or is maintained for which the present value of future
benefits payable, in excess of irrevocably designated funds for such purpose, is
materially adverse to the financial condition of the Company and its
Subsidiaries taken as a whole.  Either PTE 84-14 or PTE 90-1 applies to the
purchase of the Notes to be purchased by the Purchasers, and the execution and
delivery of this Agreement and the issuance and sale of the Notes will not
involve any transaction which is subject to the prohibitions of section 406 of
ERISA or in connection with which a penalty could be imposed under section
502(i) of ERISA or a tax could be imposed pursuant to section 4975 of the Code.
The representation by the Company in the next preceding sentence is made in
reliance upon and subject to the accuracy of your representation in paragraph
9B.

          8K.  GOVERNMENTAL CONSENT.  Neither the nature of the Company or of
any Subsidiary, nor any of their respective businesses or properties, nor any
relationship between the Company or any Subsidiary and any other Person, nor any
circumstance in connection with the offering, issuance, sale or delivery of the
Notes is such as to require any authorization, consent, approval, exemption or
other action by or notice to or filing with any court or administrative or
governmental or regulatory body (other than routine filings after the Closing
Day for any Notes with the Securities and Exchange Commission and/or state Blue
Sky authorities) in connection with the execution and delivery of this
Agreement, the offering, issuance, sale or delivery of the Notes or fulfillment
of or compliance with the terms and provisions hereof or of the Notes.

          8L.  TITLE TO PROPERTIES.  The Company has and each of its
Subsidiaries has good and defensible title to its respective real properties
(other than properties which it leases) and good title to all of its other
respective properties and assets, including the properties and assets reflected
in the most recent audited balance sheet referred to in paragraph 8B (other than
properties and assets disposed of in the ordinary course of business), subject
to no Lien of any kind except Liens permitted by paragraph 6C(1) except that (i)
with respect to easements and rights of way associated with the Company's gas
gathering systems:  (a) the Company has such title as is customary and
appropriate in accordance with applicable industry standards and (b) the costs
of curing defects in such title, if any, would not exceed $10,000,000 in the
aggregate and (ii) no representation or warranty is made with respect to any gas
or mineral property or interest to which no proved oil or gas reserves are
properly attributed.  All leases necessary in any material respect for the
conduct of the respective businesses of the Company and its Subsidiaries are
valid and subsisting and are in full force and effect.

          8M.  HOSTILE TENDER OFFERS.  None of the proceeds of the sale of any
Notes will 

                                     -30-
<PAGE>
 
be used to finance a Hostile Tender Offer.

          8N.  DISCLOSURE.  Neither this Agreement nor the Offering Materials
nor any other document, certificate or statement furnished to any Purchaser by
or on behalf of the Company in connection herewith contains any untrue statement
of a material fact or omits to state a material fact necessary in order to make
the statements contained herein and therein not misleading.  There is no fact
peculiar to the Company or any of its Subsidiaries which materially adversely
affects or in the future may (so far as the Company can now foresee) materially
adversely affect the business, property or assets, or financial condition of the
Company and its Subsidiaries taken as a whole and which has not been set forth
in this Agreement or with respect to any Purchaser, in the Offering Materials
furnished to such Purchaser by or on behalf of the Company prior to the Request
for Purchase of the Accepted Notes to be purchased by such Purchaser.  The
financial projections contained in the Offering Materials are reasonable based
on the assumptions stated therein and the best information available to the
officers of the Company.

          8O.  DELIVERY OF NCNB AGREEMENT.  The Company has delivered to each
Purchaser prior to the date hereof a true, correct and complete copy of the NCNB
Agreement, including all amendments and waivers of any provision thereof.

          8P.  PUBLIC UTILITY HOLDING COMPANY ACT; FEDERAL POWER ACT.  Neither
the Company nor any Subsidiary is a "holding company" or a "subsidiary company"
of a "holding company" or a "public utility company" as such terms are defined
in the Public Utility Holding Company Act of 1935, as amended, or, except for
                                                                   ------    
Western Power Services, Inc., a "public utility" as such term is defined in the
Federal Power Act, as amended.

          PARAGRAPH 9.  REPRESENTATIONS OF THE PURCHASERS.

          9.   REPRESENTATIONS OF THE PURCHASERS.  Each Purchaser represents as
follows:

          9A.  NATURE OF PURCHASE.  Such Purchaser is not acquiring the Notes to
be purchased by it hereunder with a view to or for sale in connection with any
distribution thereof within the meaning of the Securities Act, provided that the
disposition of such Purchaser's property shall at all times be and remain within
its control.

          9B.  SOURCE OF FUNDS.  Each Purchaser represents that at least one of
the following statements concerning each source of funds to be used by it to
purchase any Notes (respectively, the "SOURCE") is accurate as of the Closing
Day with respect to such Notes:

               (i)  The Source is not an "employee benefit plan" as defined in
     Title I, Section 3(3) of ERISA;

               (ii)  The Source is a "governmental plan" as defined in Title I,
     Section 3(32) of ERISA;

                                     -31-
<PAGE>
 
               (iii)  The Source is an insurance company, but is not a "separate
     account" as defined in Title I, Section 3(17) of ERISA;

               (iv)  The Source is either (a) an insurance company pooled
                                           -                             
     separate account, and the purchase is exempt in accordance with Prohibited
     Transaction Exemption (PTE) 90-1 (issued January 29, 1990), or (b) an
                                                                     -    
     insurance company "guaranteed contract separate account" entitled to the
     exemption granted by PTE 81-82 (issued September 18, 1981) and described in
     Department of Labor Advisory Opinion F-2584A (issued September 21, 1983);

               (v)  The Source is an "investment fund" managed by a "qualified
     professional asset manager" or "QPAM" (as defined in Part V of PTE 84-14,
     issued March 13, 1984), and the purchase is exempt under PTE 84-14;
     provided that no other party to the transactions described in this
     Agreement and no "affiliate" of such other party (as defined in Section
     V(c) of PTE 84-14) has at this time, and during the immediately preceding
     one year, exercised the authority to appoint or terminate said QPAM as
     manager of the assets of any plan identified to the Company in writing
     pursuant to this clause (v) or to negotiate the terms of said QPAM's
     management agreement on behalf of any such identified plans; or

               (vi)  The Source is a plan or a separate account comprised of
     plans identified in writing by such Purchaser to the Company pursuant to
     this clause (vi).

          PARAGRAPH 10.  DEFINITIONS.

          10.  DEFINITIONS.  For the purpose of this Agreement, the terms
defined in the introductory sentence and in paragraphs 1 and 2 shall have the
respective meanings specified therein, and the following terms shall have the
meanings specified with respect thereto below (such meanings to be equally
applicable to both the singular and plural forms of the terms defined):

          10A. YIELD-MAINTENANCE TERMS.

          "CALLED PRINCIPAL" shall mean, with respect to any Note, the principal
of such Note that is to be prepaid pursuant to paragraph 4B or is declared to be
immediately due and payable pursuant to paragraph 7A, as the context requires.

          "DISCOUNTED VALUE" shall mean, with respect to the Called Principal of
any Note, the amount obtained by discounting all Remaining Scheduled Payments
with respect to such Called Principal from their respective scheduled due dates
to the Settlement Date with respect to such Called Principal, in accordance with
accepted financial practice and at a discount factor (applied on a quarterly
basis) equal to the Reinvestment Yield with respect to such Called Principal.

          "REINVESTMENT YIELD" shall mean, with respect to the Called Principal
of any Note, the yield to maturity implied by (a) the yields reported, as of
                                               -                            
10:00 A.M. (New York City local time) 

                                     -32-
<PAGE>
 
on the Business Day next preceding the Settlement Date with respect to such
Called Principal, on the display designated as "Page 678" on the Telerate
Service (or such other display as may replace page 678 on the Telerate Service)
for actively traded U.S. Treasury securities having a maturity equal to the
Remaining Average Life of such Called Principal as of such Settlement Date, or
if such yields shall not be reported as of such time or the yields reported as
of such time shall not be ascertainable, (b) the Treasury Constant Maturity
                                          -
Series yields reported, for the latest day for which such yields shall have been
so reported as of the Business Day next preceding the Settlement Date with
respect to such Called Principal, in Federal Reserve Statistical Release H.15
(519) (or any comparable successor publication) for actively traded U.S.
Treasury securities having a constant maturity equal to the Remaining Average
Life of such Called Principal as of such Settlement Date. Such implied yield
shall be determined, (i) if necessary, by (x) converting U.S. Treasury bill
                                           -
quotations to bond-equivalent yields in accordance with accepted financial
practice and (y) interpolating linearly between yields reported for various
              -
maturities and, (ii) if interest on such Notes is paid quarterly, by converting
all such implied yields to a quarterly payment basis in accordance with accepted
financial practice.

          "REMAINING AVERAGE LIFE" shall mean, with respect to the Called
Principal of any Note, the number of years (calculated to the nearest one-
twelfth year) obtained by dividing (i) such Called Principal into (ii) the sum
                                    -                              --         
of the products obtained by multiplying (a) each Remaining Scheduled Payment of
                                         -                                     
such Called Principal (but not of interest thereon) by (b) the number of years
                                                        -                     
(calculated to the nearest one-twelfth year) which will elapse between the
Settlement Date with respect to such Called Principal and the scheduled due date
of such Remaining Scheduled Payment.
 
          "REMAINING SCHEDULED PAYMENTS" shall mean, with respect to the Called
Principal of any Note, all payments of such Called Principal and interest
thereon that would be due on or after the Settlement Date with respect to such
Called Principal if no payment of such Called Principal were made prior to its
scheduled due date.

          "SETTLEMENT DATE" shall mean, with respect to the Called Principal of
any Note, the date on which such Called Principal is to be prepaid pursuant to
paragraph 4A or is declared to be immediately due and payable pursuant to
paragraph 7A, as the context requires.

          "YIELD-MAINTENANCE AMOUNT" shall mean, with respect to any Note, an
amount equal to the excess, if any, of the Discounted Value of the Called
Principal of such Note over the sum of (i) such Called Principal plus (ii)
                                        -                              -- 
interest accrued thereon as of (including interest due on) the Settlement Date
with respect to such Called Principal.  The Yield-Maintenance Amount shall in no
event be less than zero.

          10B. OTHER TERMS.

          "ACCEPTANCE" shall have the meaning specified in paragraph 2F.

          "ACCEPTANCE DAY" shall have the meaning specified in paragraph 2F.

                                     -33-
<PAGE>
 
          "ACCEPTANCE WINDOW" shall have the meaning specified in paragraph 2F.

          "ACCEPTED NOTE" shall have the meaning specified in paragraph 2F.

          "ADJUSTED CONSOLIDATED DEBT" shall mean Consolidated Debt (excluding
Debt in the amount of the Receivables Investment relating to the Permitted
Securitization Program) plus Excess Working Capital Deficit.

          "AFFILIATE" shall mean any Person directly or indirectly controlling,
controlled by, or under direct or indirect common control with, the Company,
except a Subsidiary.  A Person shall be deemed to control a corporation if such
Person possesses, directly or indirectly, the power to direct or cause the
direction of the management and policies of such corporation, whether through
the ownership of voting securities, by contract or otherwise.

          "AUTHORIZED OFFICER" shall mean (i) in the case of the Company, its
                                           -                                 
Chief Executive Officer, its Chief Financial Officer, its President or the
Executive Vice President-General Counsel of the Company or its Vice President-
Finance or Treasurer and (ii) in the case of Prudential, any officer of
                          --                                           
Prudential designated as its "Authorized Officer" in the Purchaser Schedule or
any officer of Prudential designated as its "Authorized Officer" for the purpose
of this Agreement in a certificate executed by one of its Authorized Officers.
Any action taken under this Agreement on behalf of the Company by any individual
who on or after the date of this Agreement shall have been an Authorized Officer
of the Company and whom Prudential in good faith believes to be an Authorized
Officer of the Company at the time of such action shall be binding on the
Company even though such individual shall have ceased to be an Authorized
Officer of the Company, and any action taken under this Agreement on behalf of
Prudential by any individual who on or after the date of this Agreement shall
have been an Authorized Officer of Prudential, and whom the Company in good
faith believes to be an Authorized Officer of Prudential at the time of such
action shall be binding on Prudential even though such individual shall have
ceased to be an Authorized Officer of Prudential.

          "AVAILABLE FACILITY AMOUNT" shall have the meaning specified in
paragraph 2A.

          "BANK GUARANTY" shall mean each guaranty of a Guarantor in favor of
the banks parties to the NCNB Agreement for which a similar guaranty shall have
been issued to each holder of Notes.

          "BANKRUPTCY LAW" shall have the meaning specified in clause (viii) of
paragraph 7A.

          "BUSINESS DAY" shall mean any day other than a Saturday, a Sunday or a
day on which commercial banks in New York City are required or authorized to be
closed.

          "CANCELLATION DATE" shall have the meaning specified in paragraph
2I(3).

                                     -34-
<PAGE>
 
          "CANCELLATION FEE" shall have the meaning specified in paragraph
2I(3).

          "CAPITALIZED LEASE OBLIGATION" shall mean any rental obligation which,
under generally accepted accounting principles, is or will be required to be
capitalized on the books of the Company or any Subsidiary, taken at the amount
thereof accounted for as indebtedness (net of interest expenses) in accordance
with such principles.

          "CLOSING DAY" for any Accepted Note shall mean the Business Day
specified for the closing of the purchase and sale of such Note in the Request
for Purchase of such Note, provided that (i) if the Acceptance Day for such
                                          -                                
Accepted Note is less than five Business Days after the Company shall have made
such Request for Purchase and the Company and the Purchaser which is obligated
to purchase such Note agree on an earlier Business Day for such closing, the
"CLOSING DAY" for such Accepted Note shall be such earlier Business Day, and
                                                                            
(ii) if the closing of the purchase and sale of such Accepted Note is
 --                                                                  
rescheduled pursuant to paragraph 2H, the Closing Day for such Accepted Note,
for all purposes of this Agreement except paragraph 2I(3), shall mean the
Rescheduled Closing Day with respect to such Closing.

          "CODE" shall mean the Internal Revenue Code of 1986, as amended.

          "CONFIDENTIAL INFORMATION" shall mean any material non-public
information regarding the Company and its Subsidiaries that is provided to any
holder of any Note, any Person who purchases a participation in a Note and any
offeree of a Note or participation therein pursuant to this Agreement other than
information (i) which was publicly known or otherwise known to such holder, such
Person or such offeree at the time of disclosure, (ii) which subsequently
becomes publicly known through no act or omission of such holder, such Person or
such offeree or (iii) which otherwise becomes known to such holder, such Person
or such offeree, other than through disclosure by the Company or any Subsidiary.

          "CONFIRMATION OF ACCEPTANCE" shall have the meaning specified in
paragraph 2F.

          "CONSOLIDATED CURRENT ASSETS" shall mean the consolidated current
assets of the Company and its Subsidiaries, as determined in accordance with
generally accepted accounting principles.

          "CONSOLIDATED CURRENT LIABILITIES" shall mean the consolidated current
liabilities (including, without limitation, the Debt in respect of the Permitted
Securitization Program) of the Company and its Subsidiaries, as determined in
accordance with generally accepted accounting principles.

          "CONSOLIDATED DEBT" shall mean the consolidated Debt of the Company
and its Subsidiaries, determined in accordance with generally accepted
accounting principles.

          "CONSOLIDATED NET EARNINGS" shall mean consolidated gross revenues of
the Company and its Subsidiaries including any gains (net of expenses and taxes
applicable thereto) 

                                     -35-
<PAGE>
 
resulting from the sale, conversion or other disposition of capital assets 
(i.e., assets other than current assets), less all operating and non-operating 
 ----                                     ----                  
expenses of the Company and its Subsidiaries including all losses resulting from
the sale, conversion or other disposition of capital assets (i.e., assets other
                                                             ----
than current assets) and all charges of a proper character (including current
and deferred taxes on income, provision for taxes on unremitted foreign earnings
that are included in gross revenues, and current additions to reserves), but not
including in gross revenues any gains resulting from the write-up of assets, any
equity of the Company or any Subsidiary in the unremitted earnings of any Person
that is not a Subsidiary, any earnings of any Person acquired by the Company or
any Subsidiary through purchase, merger or consolidation or otherwise for any
period prior to the time of acquisition, or any deferred credit representing the
excess of equity in any Subsidiary at the date of acquisition over the cost of
the investment in such Subsidiary, all determined in accordance with generally
accepted accounting principles.

          "CONSOLIDATED NET EARNINGS AVAILABLE FOR RESTRICTED PAYMENTS" shall
mean an amount equal to (1) the sum of $50,000,000 plus (2) 50% (or minus 100%
                                                   ----                       
in case of a deficit) of Consolidated Net Earnings for the period commencing on
July 1, 1995 and terminating at the end of the last fiscal quarter preceding the
date of any proposed Restricted Payment (taken as one accounting period),
                                                                         
provided, however, that with respect to the fiscal quarter ended December 31,
- --------  -------                                                            
1995, solely for the purpose of determining the Consolidated Net Earnings
Available for Restricted Payments, there shall be added to Consolidated Net
Earnings the amount of $12,400,000, representing the non-cash loss recognized by
the Company as a result of the adoption of Statement of Financial Accounting
Standard No. 121, less (3) the sum of all Restricted Payments made or declared
                  ----                                                        
after June 30, 1995, plus (4) the aggregate amount received by the Company after
                     ----                                                       
June 30, 1995, as the net cash proceeds of the sale of any shares of its stock.
There shall not be included in Restricted Payments or in any computation of
Consolidated Net Earnings Available for Restricted Payments (x) dividends paid,
or distributions made, in stock of the Company; or (y) exchanges of stock of one
or more classes of the Company, except to the extent that cash or other value is
involved in such exchange.  The term "STOCK" as used in this definition and in
the definition of "Restricted Payments" shall include warrants or options to
purchase stock.

          "CONSOLIDATED NET TANGIBLE ASSETS" shall mean the consolidated assets
of the Company and its Subsidiaries, less, without duplication, (i) Consolidated
                                     ----                                       
Current Liabilities minus Excess Working Capital Deficit, (ii) asset, liability,
contingency and other reserves of the Company and its Subsidiaries, including
reserves for depreciation and for deferred income taxes, (iii) all other
liabilities of the Company and its Subsidiaries, except liabilities for Funded
Debt of the types described in clauses (i), (ii) and (iii) of the definition of
Debt, and (iv) treasury stock, unamortized debt discount and expense, goodwill,
trademarks, brand names, patents, organizational expenses and any other
intangible assets of the Company and its Subsidiaries, and any write-up of the
value of any assets after June 30, 1991, all as determined in accordance with
generally accepted accounting principles; provided, however, that the term
                                          --------  -------               
"Consolidated Net Tangible Assets" shall include the book value of long-term gas
contracts with producers that the Company assumes in connection with
acquisitions and that are reflected on the books of the Company as assets.

          "CONSOLIDATED TANGIBLE NET WORTH" shall mean consolidated
stockholders' equity 

                                     -36-
<PAGE>
 
of the Company and its Subsidiaries, less goodwill, trademarks, brand names,
patents, organizational expenses and any other intangible assets of the Company
and its Subsidiaries, all as determined in accordance with generally accepted
accounting principles; provided, however, that the term "Consolidated Tangible
                       --------  ------- 
Net Worth" shall include the book value of long-term gas contracts with
producers that the Company assumes in connection with acquisitions and that are
reflected on the books of the Company as assets.

          "COUNTERPARTY" shall mean (i) any Person described in Schedule 6C(8),
(ii) any Person that is not an Affiliate of the Company and that has senior debt
securities rated at least A by Standard & Poor's Rating Group or Moody's
Investors Service, Inc. or whose obligations in respect of the agreements
described in the final proviso to paragraph 6C(8) or in the definition of Long
Hedge Future or Short Hedge Future, as the case may be, are fully guaranteed by
an affiliate of such Person whose senior debt securities are so rated, and (iii)
any other Person that is not an Affiliate of the Company and with whom the
Company has agreements of the nature described in the final proviso to paragraph
6C(8) or in the definition of Long Hedge Future or Short Hedge Future, so long
as (a) the aggregate amount of all such agreements with such Person outstanding
at any time shall not exceed $1,000,000 and (b) the Company has such agreements
outstanding with no more than nine other such Persons at any time.

          "DEBT" shall mean, without duplication:

               (i)    any obligation that, under generally accepted accounting
          principles, is shown on the balance sheet as a liability (including,
          without limitation, any obligation for borrowed money, any notes
          payable and drafts accepted representing extensions of credit, whether
          or not representing obligations for borrowed money, and Capitalized
          Lease Obligations but excluding accounts payable and accrued expenses
          in the ordinary course of business, reserves for deferred income taxes
          and other reserves to the extent that such reserves do not constitute
          an obligation),

               (ii)   any obligation secured by a Lien on, or payable out of
          the proceeds of production from, property, whether or not the
          obligation secured thereby shall have been assumed by the owner of
          such property,

               (iii)  liabilities in respect of unfunded vested benefits under
          Plans and liabilities in respect of postretirement benefits that,
          under generally accepted accounting principles in effect at the time
          in question, are shown on the balance sheet as a liability, and

               (iv)   any obligation described in paragraph 6C(10) (Guaranties)
          for which a maximum amount is quantifiable.

          "DELAYED DELIVERY FEE" shall have the meaning specified in paragraph
2I(2).

          "ERISA" shall mean the Employee Retirement Income Security Act of
1974, as 

                                     -37-
<PAGE>
 
amended.

          "EVENT OF DEFAULT" shall mean any of the events specified in paragraph
7A, provided that there has been satisfied any requirement in connection with
such event for the giving of notice, or the lapse of time, or the happening of
any further condition, event or act, and "DEFAULT" shall mean any of such
events, whether or not any such requirement has been satisfied.

          "EXCESS WORKING CAPITAL DEFICIT" shall mean (i) if the Company's
Working Capital is greater than or equal to negative $10,000,000, zero, or (ii)
if the Company's Working Capital is less than negative $10,000,000, the product
of (A) the amount of such Working Capital plus $10,000,000 multiplied by (B)
                                          ----             -------------    
negative one (for example, if Working Capital equals negative $15,000,000, the
Excess Working Capital Deficit would equal $5,000,000).  For purposes of this
definition, "WORKING CAPITAL" means the remainder of the Company's Consolidated
Current Assets minus the Company's Consolidated Current Liabilities, excluding
               -----                                                          
current maturities of  Funded Debt.

          "EXCHANGE ACT" shall mean the Securities Exchange Act of 1934, as
amended.

          "EXISTING NOTES" shall have the meaning specified in paragraph 1A.

          "FACILITY" shall have the meaning specified in paragraph 2A.

          "FACILITY FEE" shall have the meaning specified in paragraph 2I(1).

          "FAIR MARKET VALUE" shall mean, at any time with respect to any
property of any kind or character, the sale value of such property that would be
realized in an arm's-length sale at such time between an informed and willing
buyer and an informed and willing seller, under no compulsion to buy or sell,
respectively.

          "FUNDED DEBT" shall mean any Debt payable more than one year from the
date of creation thereof.

          "GUARANTOR" shall mean each of Western Gas Resources Storage, Inc., a
Texas corporation; Western Gas Resources Texas, Inc., a Texas corporation;
Western Gas Resources-Oklahoma, Inc., a Delaware corporation; Mountain Gas
Resources, Inc., a Delaware corporation; MGTC, MIGC and each other Subsidiary of
the Company that issues a Guaranty to all of the holders of Notes.

          "GUARANTY" shall mean each guaranty of a Guarantor in substantially
the form of Exhibit G hereto.

          "HOSTILE TENDER OFFER" shall mean, with respect to the use of proceeds
of any Note, any offer to purchase, or any purchase of, shares of capital stock
of any corporation or equity interests in any other entity, or securities
convertible into or representing the beneficial ownership 

                                     -38-
<PAGE>
 
of, or rights to acquire, any such shares or equity interests, if such shares,
equity interests, securities or rights are of a class which is publicly traded
on any securities exchange or in any over-the-counter market, other than
purchases of such shares, equity interests, securities or rights representing
less than 5% of the equity interests or beneficial ownership of such corporation
or other entity for portfolio investment purposes, and such offer or purchase
has not been duly approved by the board of directors of such corporation or the
equivalent governing body of such other entity prior to the date on which the
Company makes the Request for Purchase of such Note.

          "INTERCREDITOR AGREEMENT" shall mean the Intercreditor Agreement
substantially in the form of Exhibit H hereto.

          "ISSUANCE PERIOD" shall have the meaning specified in paragraph 2B.

          "LIEN" shall mean any mortgage, pledge, priority, security interest,
encumbrance, deposit arrangement, lien (statutory or otherwise) or charge of any
kind (including any agreement to give any of the foregoing, any conditional sale
or other title retention agreement, any lease in the nature thereof, and the
filing of or agreement to give any financing statement under the Uniform
Commercial Code of any jurisdiction) or any other type of preferential
arrangement for the purpose, or having the effect, of protecting a creditor
against loss or securing the payment or performance of an obligation.

          "LONG HEDGE FUTURE" shall mean an agreement, purchased on a
commodities exchange or entered into with a Counterparty, that obligates the
Company to purchase natural gas or liquid hydrocarbons, as the case may be, at a
pre-determined price at a pre-determined time.

          "MGTC" shall mean MGTC, Inc., a Wyoming corporation.

          "MIGC" shall mean MIGC, Inc., a Delaware corporation.

          "MULTIEMPLOYER PLAN" shall mean any plan that is a "multiemployer
plan" (as such term is defined in section 4001(a)(3) of ERISA).

          "NCNB" shall mean NationsBank of Texas, N.A., and its successors and
assigns.

          "NCNB AGREEMENT" shall mean (i) from the date hereof to August 31,
1993, the First Restated Loan Agreement, dated as of October 31, 1991, between
the Company and NCNB, as Agent and NCNB and Bankers Trust Company as Co-Managers
of the Acquisition Loan and Certain Banks as Lenders, and (ii) from and after
August 31, 1993, Term Loan Agreement and the Revolving Loan Agreement.

          "NOTES" shall have the meaning specified in paragraph 1B.

          "OFFERING MATERIALS" shall mean, at the time any representation is
made or deemed made with respect thereto under or pursuant to this Agreement by
the Company,  the most recent 

                                     -39-
<PAGE>
 
Annual Report on Form 10-K of the Company filed with the Securities and Exchange
Commission prior to such time, the most recent Annual Report to stockholders
sent to stockholders of the Company prior to such time, all Quarterly Reports on
Form 10-Q of the Company filed with the Securities and Exchange Commission prior
to such time for quarterly periods completed after the completion of the fiscal
year covered by such Annual Report on Form 10-K, all quarterly reports to
stockholders sent to stockholders of the Company prior to such time for
quarterly periods completed after the completion of the fiscal year covered by
such annual report to stockholders, all proxy statements, notices and other
reports sent by the Company to its public stockholders prior to such time and
after the end of such fiscal year, all registration statements (without
exhibits) and all reports (including, without limitation, reports on Form 8-K)
filed by the Company with the Securities and Exchange Commission or any
securities exchange or other organization or association supervising trading in
the Company's securities prior to such time and after the end of such fiscal
year, and all press releases issued by the Company prior to such time and after
the end of such fiscal year.

          "OFFICER'S CERTIFICATE" shall mean a certificate signed in the name of
the Company by an Authorized Officer of the Company.

          "OVER-COLLATERALIZATION AMOUNT" shall have the meaning specified in
the definition of "Permitted Securitization Program."

          "PANHANDLE JOINT VENTURE" shall mean the joint venture formed between
the Company and Panhandle Eastern Pipe Line Company.

          "PBGC" shall mean the Pension Benefit Guaranty Corporation or any
successor entity serving a similar function.

          "PERMITTED SECURITIZATION PROGRAM" shall mean a transaction executed
pursuant to documentation that contemplates a commitment which is for a period
of not more than 364 days and which is not extendible at the option of the
Company or any of its Subsidiaries and pursuant to which each of the following
conditions is satisfied:

               (a)  the Company and the Subsidiaries sell, transfer or otherwise
          dispose of, at not less than face value, on a revolving basis, an
          undivided interest in a pool of the Company's and the Subsidiaries'
          accounts receivable to a special purpose entity (the "SPECIAL PURPOSE
          ENTITY"), in an amount not to exceed, at any time $75,000,000 and
          grants a security interest of connection therewith with respect to
          such accounts receivable which secures an amount not greater than 10%
          of the aforesaid amount sold or transferred at such time for the
          purpose of providing the purchaser with over-collateralization (the
          "OVER-COLLATERALIZATION AMOUNT"); and, as a part of such transaction.

               (b)  the Company and the Subsidiaries grant a security interest
          (the "SECURITY INTEREST") in all or a portion of their accounts
          receivable (the "PLEDGED ACCOUNTS RECEIVABLE") to a the Special
          Purpose Entity for the purpose of providing 

                                     -40-
<PAGE>
 
          the Special Purpose Entity with a basis of recourse for its investment
          (i.e., the aforesaid amount not to exceed $75,000,000) in the Pledged
          Accounts Receivable (the "RECEIVABLES INVESTMENT"), provided that:
                                                              --------      

                    (i)    the maximum recourse to the Pledged Accounts
               Receivable shall be equal to the purchase price of the
               Receivables Investment plus 10%, in an aggregate amount not to
               exceed Eighty-Two Million Five Hundred Thousand Dollars
               ($82,500,000) (the "RECOURSE AMOUNT").

                    (ii)   the Security Interest shall apply to each Pledged
               Accounts Receivable in an amount not to exceed the proportion
               that the Recourse Amount bears to the face value of the Pledged
               Accounts Receivable; and

                    (iii)  the Company and the Subsidiaries shall be entitled to
               share (with the Special Purpose Entity), on a pari passu and pro
               rata basis (based upon the Special Purpose Entity's share
               described in clause (ii)), all proceeds (if any) derived from
               each Pledged Accounts Receivable.

          "PERPETUAL PREFERRED STOCK" shall mean any class of preferred stock of
the Company which has no mandatory provision for partial or complete redemption
at any time.

          "PERSON" shall mean and include an individual, a partnership, a joint
venture, a corporation, a trust, an unincorporated organization and a government
or any department or agency thereof.

          "PLAN" shall mean an "employee pension benefit plan" (as defined in
section 3 of ERISA) that is or has been established or maintained, or to which
contributions are or have been made, by the Company or by any trade or business,
whether or not incorporated, that, together with the Company, is under common
control, as described in section 414(b) or (c) of the Code.

          "PLEDGED ACCOUNTS RECEIVABLE" shall have the meaning specified in the
definition of "Permitted Securitization Program."

          "PRICE MOVEMENT" shall have the meaning specified in paragraph 2I(3).

          "PRUDENTIAL" shall mean The Prudential Insurance Company of America.

          "PRUDENTIAL ACCEPTED NOTES"  shall have the meaning specified in
paragraph 2F.

          "PRUDENTIAL AFFILIATE" shall mean any corporation or other entity all
of the Voting Stock (or equivalent voting securities or interests) of which is
owned by Prudential either directly or through Prudential Affiliates.

          "PTE 84-14" shall mean Prohibited Transaction Exemption 84-14 granted
by the 

                                     -41-
<PAGE>
 
Department of Labor pursuant to ERISA.

          "PTE 90-1" shall mean Prohibited Transaction Exemption 90-1 granted by
the Department of Labor pursuant to ERISA.

          "PURCHASERS" shall mean Prudential and each Prudential Affiliate that
purchases or agrees to purchase any Note.

          "RECEIVABLE INVESTMENT" shall have the meaning specified in the
definition of "Permitted Securitization Program".

          "RECEIVABLES PURCHASE AGREEMENT" shall mean that certain Receivables
Purchase Agreement dated as of February 28, 1995, among the Company, Receivables
Capital Corporation and Bank of America National Trust and Savings Association,
as the provisions thereof have heretofore been amended or waived or may be from
time to time amended or waived.

          "RENEWAL FEE" shall have the meaning specified in paragraph 2B.

          "REQUEST FOR PURCHASE" shall have the meaning specified in paragraph
2D.

          "REQUIRED HOLDER(S)" shall mean, with respect to the Notes of any
Series, at any time, the holder or holders of at least 66 2/3% of the aggregate
principal amount of the Notes of such Series outstanding at such time.

          "RESCHEDULED CLOSING DAY" shall have the meaning specified in
paragraph 2H.

          "RESTRICTED PAYMENT" shall mean (a) any dividend paid or declared by
the Company or any Subsidiary on any class of the Company's stock (other than a
dividend payable in shares of stock of the Company), or any other distribution
made by the Company or any Subsidiary on account of any class of the Company's
stock, or (b) any cash or other consideration applied, directly or indirectly,
by the Company or any Subsidiary to the redemption, purchase or other
acquisition of any shares of the Company's stock or (c) any payment of principle
of, or retirement, redemption, purchase or other acquisition of any subordinated
debt.

          "REVOLVING LOAN AGREEMENT" shall mean the Loan Agreement (Revolver)
dated August 31, 1993 between the Company and NationsBank of Texas, N.A.
(formerly known as NCNB Texas National Bank), as the provisions thereof have
been or may be from time to time amended or waived in compliance with paragraph
6F.

          "SECURITIES ACT" shall mean the Securities Act of 1933, as amended.

          "SERIES" shall have the meaning specified in paragraph 1B.

          "SHORT HEDGE FUTURE" shall mean an agreement, purchased on a
commodities 

                                     -42-
<PAGE>
 
exchange or entered into with a Counterparty, that obligates the Company to sell
natural gas or liquid hydrocarbons, as the case may be, at a pre-determined
price at a pre-determined time.

          "SIGNIFICANT HOLDER" shall mean (i) each Purchaser, so long as such
Purchaser shall hold any Note, (ii) each affiliate of a Purchaser, so long as
such affiliate shall hold any Note, or (iii) any other holder of a Note that,
together with its affiliates, shall hold at least 5% of the aggregate principal
amount of the Notes from time to time outstanding.

          "STOCK OPTION AGREEMENTS" shall mean, collectively those certain
Agreements to Provide Loan(s) to exercise key employees' Stock Options by and
among the Company and certain key employees.
 
          "SUBSIDIARY" shall mean any corporation organized under the laws of
any state of the United States of America, Canada, or any province of Canada,
which conducts the major portion of its business in and makes the major portion
of its sales to Persons located in the United States of America or Canada, and
at least a majority of the combined voting power of all classes of Voting Stock
of which shall, at the time as of which any determination is being made, be
owned by the Company either directly or through Subsidiaries.  A "WHOLLY OWNED
SUBSIDIARY" shall be a Subsidiary all of the stock of every class of which,
except directors' qualifying shares shall, at the time at which any
determination is being made, be owned by the Company either directly or through
wholly owned subsidiaries.

          "TERMINATION DATE" shall have the meaning specified in paragraph 2B.

          "TERMINATION EVENT" shall mean (i) a Reportable Event described in
Section 4043 of ERISA and the regulations issued thereunder (other than a
Reportable Event not subject to the provision for 30-day notice to the PBGC
under such regulations), or (ii) the withdrawal of the Company or any of its
ERISA Affiliates from a Plan during a plan year in which it was a "substantial
employer" as defined in Section 4001(a)(2) of ERISA, or (iii) the filing of a
notice of intent to terminate a Plan or the treatment of a Plan amendment as a
termination under Section 4041 of ERISA, or (iv) the institution of proceedings
to terminate a Plan by the PBGC, or (v) any other event or condition that might
constitute grounds under Section 4042 of ERISA for the termination of, or the
appointment of a trustee to administer, any Plan.

          "TERM LOAN" shall mean the $50,000,000 of "Term Loans" outstanding
under the NCNB Agreement as of the date of this Agreement under the terms
existing as of the date of this Agreement.

          "TERM LOAN AGREEMENT" shall mean the Third Restated Loan Agreement
(Term) dated August 31, 1993 between the Company and NationsBank of Texas, N.A.
(formerly known as NCNB Texas National Bank) as Agent and Certain Banks as
Lenders.

          "TRANSFEREE" shall mean any direct or indirect transferee of all or
any part of any Note purchased by any Purchaser under this Agreement.

                                     -43-
<PAGE>
 
          "VOTING STOCK" shall mean, with respect to any corporation, any shares
of stock of such corporation whose holders are entitled under ordinary
circumstances to vote for the election of directors of such corporation
(irrespective of whether at the time stock of any other class or classes shall
have or might have voting power by reason of the happening of any contingency).

          "1993 NOTE PURCHASE AGREEMENT" shall mean, collectively, those certain
separate Note Purchase Agreements each dated as of April 1, 1993, between the
Company and each of the purchasers listed on Annex 1 thereto, respectively, as
the provisions thereof have heretofore been amended or waived or may be from
time to time amended or waived in compliance with paragraph 6F.

          "1995 NOTE PURCHASE AGREEMENT" shall mean, the Note Purchase
Agreements dated as of November 29, 1995, between the Company and the Purchasers
listed on the signature page thereto, as the provisions thereof have heretofore
been amended or waived or may be from time to time amended or waived in
compliance with paragraph 6F.

          10C. ACCOUNTING TERMS AND DETERMINATIONS.  All references in this
Agreement to "generally accepted accounting principles" shall be deemed to refer
to generally accepted accounting principles in effect in the United States at
the time of application thereof, subject to the next sentence.  Unless otherwise
specified herein, all accounting terms used herein shall be interpreted, all
determinations with respect to accounting matters hereunder shall be made, and
all financial statements and certificates and reports as to financial matters
required to be furnished hereunder shall be prepared, in accordance with
generally accepted accounting principles, applied on a basis consistent with the
audited consolidated financial statements of the Company and its Subsidiaries
delivered pursuant to clause (ii) of paragraph 5A or, if no such statements have
been delivered, the most recent audited financial statements referred to in
clause (i) of paragraph 8B.

          PARAGRAPH 11.  MISCELLANEOUS.

          11A. NOTE PAYMENTS.  The Company agrees that, so long as any Purchaser
shall hold any Note, it will make payments of principal of, interest on and any
Yield-Maintenance Amount payable with respect to such Note, which comply with
the terms of this Agreement, by wire transfer of immediately available funds for
credit (not later than 12:00 noon, New York City time, on the date due) to the
account or accounts of such Purchaser, if any, as are specified in the Purchaser
Schedule attached hereto, or, in the case of any Purchaser not named in the
Purchaser Schedule or any Purchaser wishing to change the account specified for
it in the Purchaser Schedule such account or accounts in the United States as
such Purchaser may from time to time designate in writing, notwithstanding any
contrary provision herein or in any Note with respect to the place of payment.
Each Purchaser agrees that, before disposing of any Note, it will make a
notation thereon (or on a schedule attached thereto) of all principal payments
previously made thereon and of the date to which interest thereon has been paid.
The Company agrees to afford the benefits of this paragraph 11A to any
Transferee which shall have made the same agreement as the Purchasers have made
in this paragraph 11A.

                                     -44-
<PAGE>
 
          11B. EXPENSES.  The Company agrees, whether or not the transactions
contemplated hereby shall be consummated, to pay, and save each Purchaser and
any Transferee harmless against liability for the payment of, all out-of-pocket
expenses arising in connection with such transactions, including (i) all
                                                                  -     
document production and duplication charges and the fees and expenses of any
special counsel engaged by the Purchasers or any Transferee in connection with
any subsequent proposed modification of, or proposed consent under, this
Agreement, whether or not such proposed modification shall be effected or
proposed consent granted, and (ii) the costs and expenses, including reasonable
                               --                                              
attorneys' fees, incurred by any Purchaser or any Transferee in enforcing (or
determining whether or how to enforce) any rights under this Agreement or the
Notes or in responding to any subpoena or other legal process or informal
investigative demand issued in connection with this Agreement or the
transactions contemplated hereby or by reason of any Purchaser's or any
Transferee's having acquired any Note (other than costs and expenses incurred in
acquiring or merely holding a Note or interest therein), including without
limitation costs and expenses incurred in any bankruptcy case.  The obligations
of the Company under this paragraph 11B shall survive the transfer of any Note
or portion thereof or interest therein by any Purchaser or any Transferee and
the payment of any Note.

          11C. CONSENT TO AMENDMENTS.  This Agreement may be amended, and the
Company may take any action herein prohibited, or omit to perform any act herein
required to be performed by it, if the Company shall obtain the written consent
to such amendment, action or omission to act, of the Required Holder(s) of the
Notes of each Series except that, (i) with the written consent of the holders of
                                   -                                            
all Notes of a particular Series, and if an Event of Default shall have occurred
and be continuing, of the holders of all Notes of all Series, at the time
outstanding (and not without such written consents), the Notes of such Series
may be amended or the provisions thereof waived to change the maturity thereof,
to change or affect the principal thereof, or to change or affect the rate or
time of payment of interest on or any Yield-Maintenance Amount payable with
respect to the Notes of such Series, (ii) without the written consent of the
                                      --                                    
holder or holders of all Notes at the time outstanding, no amendment to or
waiver of the provisions of this Agreement shall change or affect the provisions
of paragraph 7A or this paragraph 11C insofar as such provisions relate to
proportions of the principal amount of the Notes of any Series, or the rights of
any individual holder of Notes, required with respect to any declaration of
Notes to be due and payable or with respect to any consent, (iii) with the
                                                             ---          
written consent of Prudential (and not without the written consent of
Prudential) the provisions of paragraph 2 may be amended or waived (except
insofar as any such amendment or waiver would affect any rights or obligations
with respect to the purchase and sale of Notes which shall have become Accepted
Notes prior to such amendment or waiver) and (iv) with the written consent of
                                              --                             
all of the Purchasers which shall have become obligated to purchase Accepted
Notes of any Series (and not without the written consent of all such
Purchasers), any of the provisions of paragraphs 2 and 3 may be amended or
waived insofar as such amendment or waiver would affect only rights or
obligations with respect to the purchase and sale of the Accepted Notes of such
Series or the terms and provisions of such Accepted Notes.  Each holder of any
Note at the time or thereafter outstanding shall be bound by any consent
authorized by this paragraph 11C, whether or not such Note shall have been
marked to indicate such consent, but any Notes issued thereafter may bear a
notation referring to any such consent.  No course of dealing between the
Company and the holder of any Note nor any delay in exercising any rights

                                     -45-
<PAGE>
 
hereunder or under any Note shall operate as a waiver of any rights of any
holder of such Note.  As used herein and in the Notes, the term "THIS AGREEMENT"
and references thereto shall mean this Amended and Restated Master Shelf
Agreement as it may from time to time be amended or supplemented.

          11D. FORM, REGISTRATION, TRANSFER AND EXCHANGE OF NOTES; LOST NOTES.
The Notes are issuable as registered notes without coupons in denominations of
at least $100,000, except as may be necessary to reflect any principal amount
not evenly divisible by $100,000.  The Company shall keep at its principal
office a register in which the Company shall provide for the registration of
Notes and of transfers of Notes.  Upon surrender for registration of transfer of
any Note at the principal office of the Company, the Company shall, at its
expense, execute and deliver one or more new Notes of like tenor and of a like
aggregate principal amount, registered in the name of such transferee or
transferees; provided that the Company shall not be required to register any
             --------                                                       
transfer that was made in violation of the legend appearing on such Note.  At
the option of the holder of any Note, such Note may be exchanged for other Notes
of like tenor and of any authorized denominations, of a like aggregate principal
amount, upon surrender of the Note to be exchanged at the principal office of
the Company.  Whenever any Notes are so surrendered for exchange, the Company
shall, at its expense, execute and deliver the Notes which the holder making the
exchange is entitled to receive.  Each installment of principal payable on each
installment date upon each new Note issued upon any such transfer or exchange
shall be in the same proportion to the unpaid principal amount of such new Note
as the installment of principal payable on such date on the Note surrendered for
registration of transfer or exchange bore to the unpaid principal amount of such
Note.  No reference need be made in any such new Note to any installment or
installments of principal previously due and paid upon the Note surrendered for
registration of transfer or exchange. Every Note surrendered for registration of
transfer or exchange shall be duly endorsed, or be accompanied by a written
instrument of transfer duly executed, by the holder of such Note or such
holder's attorney duly authorized in writing.  Any Note or Notes issued in
exchange for any Note or upon transfer thereof shall carry the rights to unpaid
interest and interest to accrue which were carried by the Note so exchanged or
transferred, so that neither gain nor loss of interest shall result from any
such transfer or exchange.  Upon receipt of written notice from the holder of
any Note of the loss, theft, destruction or mutilation of such Note and, in the
case of any such loss, theft or destruction, upon receipt of such holder's
unsecured indemnity agreement, or in the case of any such mutilation upon
surrender and cancellation of such Note, the Company will make and deliver a new
Note, of like tenor, in lieu of the lost, stolen, destroyed or mutilated Note.

          11E. PERSONS DEEMED OWNERS; PARTICIPATIONS.  Prior to due presentment
for registration of transfer, the Company may treat the Person in whose name any
Note is registered as the owner and holder of such Note for the purpose of
receiving payment of principal of and interest on and any Yield-Maintenance
Amount payable with respect to such Note and for all other purposes whatsoever,
whether or not such Note shall be overdue, and the Company shall not be affected
by notice to the contrary.  Subject to the preceding sentence, the holder of any
Note may from time to time grant participations in all or any part of such Note
to any Person on such terms and conditions as may be determined by such holder
in its sole and absolute discretion.

                                     -46-
<PAGE>
 
          11F. SURVIVAL OF REPRESENTATIONS AND WARRANTIES; ENTIRE AGREEMENT.
All representations and warranties contained herein or made in writing by or on
behalf of the Company in connection herewith shall survive the execution and
delivery of this Agreement and the Notes, the transfer by any Purchaser of any
Note or portion thereof or interest therein and the payment of any Note, and may
be relied upon by any Transferee, regardless of any investigation made at any
time by or on behalf of any Purchaser or any Transferee.  Subject to the
preceding sentence, this Agreement and the Notes embody the entire agreement and
understanding between the parties hereto with respect to the subject matter
hereof and supersede all prior agreements and understandings relating to such
subject matter.

          11G. SUCCESSORS AND ASSIGNS.  All covenants and other agreements in
this Agreement contained by or on behalf of any of the parties hereto shall bind
and inure to the benefit of the respective successors and assigns of the parties
hereto (including, without limitation, any Transferee) whether so expressed or
not.

          11H. DISCLOSURE TO OTHER PERSONS; CONFIDENTIALITY.  EXCEPT AS PROVIDED
IN THIS PARAGRAPH 11H, EACH HOLDER AND EACH PERSON WHO PURCHASES A PARTICIPATION
IN A NOTE OR ANY PART THEREOF AGREES THAT, PRIOR TO THE OCCURRENCE OF A DEFAULT,
IT WILL USE ITS BEST EFFORTS TO HOLD IN CONFIDENCE AND NOT TO DISCLOSE THE
CONFIDENTIAL INFORMATION.  The Company acknowledges that the holder of any Note
may deliver copies of any financial statements and other documents delivered to
such holder, and disclose any other information disclosed to such holder, by or
on behalf of the Company or any Subsidiary in connection with or pursuant to
this Agreement to (i) such holder's directors, officers, employees, agents and
professional consultants, (ii) any other holder of any Note, (iii) any Person to
which such holder offers to sell such Note or any part thereof, (iv) any Person
to which such holder sells or offers to sell a participation in all or any part
of such Note, (v) any federal or state regulatory authority having jurisdiction
over such holder, (vi) the National Association of Insurance Commissioners or
any similar organization or (vii) any other Person to which such delivery or
disclosure may be necessary or appropriate (a) in compliance with any law, rule,
regulation or order applicable to such holder, (b) in response to any subpoena
or other legal process or informal investigative demand, (c) in connection with
any litigation to which such holder is a party or (d) in order to protect such
holder's investment in such Note; PROVIDED THAT PRIOR TO DISCLOSING CONFIDENTIAL
                                  --------                                      
INFORMATION TO ANY OFFEREE REFERRED TO IN CLAUSE (III) AND (IV) ABOVE, SUCH
HOLDER WILL USE ITS BEST EFFORTS TO HAVE SUCH OFFEREE DELIVER TO THE COMPANY A
CONFIDENTIALITY AGREEMENT SUBSTANTIALLY IN THE FORM OF EXHIBIT F HERETO.

          11I. NOTICES.  All written communications provided for hereunder
(other than communications provided for under paragraph 2) shall be sent by
first class mail or nationwide overnight delivery service (with charges prepaid)
and (i) if to any Person listed in the Purchaser Schedule attached hereto,
     -                                                                    
addressed to it at the address specified for such communications in the
Purchaser Schedule, or at such other address as it shall have specified in
writing to the Person sending such communication, and (ii) if to any Purchaser
                                                       --                     
or holder of any Note which is not a Person listed in the Purchaser Schedule,
addressed to it at such address as it shall have specified in writing to the
Person sending such communication or, if any such holder shall not have so
specified an address, then addressed to such holder in care of the last holder
of such Note which shall have 

                                     -47-
<PAGE>
 
so specified an address to the Person sending such communication, and (iii) if 
                                                                       ---
to the Company, addressed to it at 12200 N. Pecos Street, Denver, Colorado
80234, Attention: John C. Walter, Vice President-General Counsel, Telecopy No.
(303) 252-3362 or at such other address as the Company shall have specified to
the holder of each Note in writing; provided, however, that any such 
                                    --------  ------- 
communication to the Company may also, at the option of the Person sending such
communication, be delivered by any other means either to the Company at its
address specified above or to any Authorized Officer of the Company. Any
communication pursuant to paragraph 2 shall be made by the method specified for
such communication in paragraph 2, and shall be effective to create any rights
or obligations under this Agreement only if, in the case of a telephone
communication, an Authorized Officer of the party conveying the information and
of the party receiving the information are parties to the telephone call, and in
the case of a telecopier communication, the communication is signed by an
Authorized Officer of the party conveying the information, addressed to the
attention of an Authorized Officer of the party receiving the information, and
in fact received at the telecopier terminal the number of which is listed for
the party receiving the communication in the case of the Company, as provided
above, and in the case of any Purchaser, as provided in the Purchaser Schedule
or at such other telecopier terminal as the party receiving the information
shall have specified in writing to the party sending such information.

          11J. PAYMENTS DUE ON NON-BUSINESS DAYS.  Anything in this Agreement or
the Notes to the contrary notwithstanding, any payment of principal of or
interest on any Note that is due on a date other than a Business Day shall be
made on the next succeeding Business Day.  If the date for any payment is
extended to the next succeeding Business Day by reason of the preceding
sentence, the period of such extension shall be included in the computation of
the interest payable on such Business Day.


          11K. SATISFACTION REQUIREMENT.  If any agreement, certificate or other
writing, or any action taken or to be taken, is by the terms of this Agreement
required to be satisfactory to any Purchaser, to any holder of Notes or to the
Required Holder(s), the determination of such satisfaction shall be made by such
Purchaser, such holder or the Required Holder(s), as the case may be, in the
sole and exclusive judgment (exercised in good faith) of the Person or Persons
making such determination.

          11L. GOVERNING LAW.  THIS AGREEMENT SHALL BE CONSTRUED AND ENFORCED IN
ACCORDANCE WITH, AND THE RIGHTS OF THE PARTIES SHALL BE GOVERNED BY, THE LAW OF
THE STATE OF NEW YORK.

          11M. SEVERABILITY.  Any provision of this Agreement which is
prohibited or unenforceable in any jurisdiction shall, as to such jurisdiction,
be ineffective to the extent of such prohibition or unenforceability without
invalidating the remaining provisions hereof, and any such prohibition or
unenforceability in any jurisdiction shall not invalidate or render
unenforceable such provision in any other jurisdiction.

          11N. DESCRIPTIVE HEADINGS.  The descriptive headings of the several
paragraphs 

                                     -48-
<PAGE>
 
of this Agreement are inserted for convenience only and do not
constitute a part of this Agreement.

          11O. COUNTERPARTS.  This Agreement may be executed simultaneously in
two or more counterparts, each of which shall be deemed an original, and it
shall not be necessary in making proof of this Agreement to produce or account
for more than one such counterpart.

          11P. BINDING AGREEMENT.  When this Agreement is executed and delivered
by the Company and Prudential, it shall become a binding agreement between the
Company and Prudential. This Agreement shall also inure to the benefit of each
other Purchaser which shall have executed and delivered a Confirmation of
Acceptance, and each such other Purchaser shall be bound by this Agreement to
the extent provided in such Confirmation of Acceptance.

          If you are in agreement with the foregoing, please sign the form of
acceptance on the enclosed counterparts of this letter and return the same to
the Company, whereupon this letter shall become a binding agreement between the
Company and Prudential effective as of January 31, 1996.

                                            Very truly yours,              
                                                                           
                                            WESTERN GAS RESOURCES, INC.    
                                                                      
                                                                      
                                            By: /s/ WILLIAM J. KRYSIAK
                                                ----------------------
                                                Vice President-Finance   


The foregoing Agreement is
hereby accepted as of the
date first above written.

THE PRUDENTIAL INSURANCE COMPANY OF AMERICA


By /s/ THE PRUDENTIAL INSURANCE COMPANY OF AMERICA
   -----------------------------------------------
   Vice President


PRUCO LIFE INSURANCE COMPANY


By /s/ PRUCO LIFE INSURANCE COMPANY
   --------------------------------
   Vice President

                                     -49-

<PAGE>
 
            SIXTH AMENDMENT TO THIRD RESTATED LOAN AGREEMENT (TERM)

     THIS SIXTH AMENDMENT TO THIRD RESTATED LOAN AGREEMENT (TERM) (herein called
the "Amendment") made as of the 29th day of November 1995, by and among Western
Gas Resources, Inc., a Delaware corporation ("Borrower"), NationsBank of Texas,
N.A., a national banking association, as Agent ("Agent"), and NationsBank of
Texas, N.A., Bankers Trust Company, Bank of Montreal and CIBC Inc. (herein,
collectively referred to as "Lenders"),

                             W I T N E S S E T H:

     WHEREAS, Borrower, Agent and Lenders have entered into that certain Third
Restated Loan Agreement (Term) dated as of August 31, 1993, as amended by that
certain First Amendment to Third Restated Loan Agreement (Term) dated as of
December 31, 1993, that certain Second Amendment to Third Restated Loan
Agreement (Term) dated as of September 2, 1994, that certain Third Amendment to
Third Restated Loan Agreement (Term) dated as of December 2, 1994, that certain
Fourth Amendment to Third Restated Loan Agreement (Term) dated as of February
23, 1995, and that certain Fifth Amendment to Third Restated Loan Agreement
(Term) dated as of July 19, 1995, among Borrower, Agent and Lenders (as amended
to the date hereof, the "Original Agreement") for the purpose and consideration
therein expressed, whereby Lenders made loans to Borrower as therein provided;
and

     WHEREAS, Borrower, Agent and Lenders desire to amend the Original Agreement
as expressly set forth herein;

     NOW, THEREFORE, in consideration of the premises and the mutual covenants
and agreements contained herein and in the Original Agreement and in
consideration of the loans which may hereafter be made by Lenders to Borrower,
and for other good and valuable consideration, the receipt and sufficiency of
which are hereby acknowledged, the parties hereto do hereby agree as follows:

                                  ARTICLE I.

                          Definitions and References
                          --------------------------

     Section 1.1.  Terms Defined in the Original Agreement.  Unless the context
                   ---------------------------------------                     
otherwise requires or unless otherwise expressly defined herein, the terms
defined in the Original Agreement shall have the same meanings whenever used in
this Amendment.

     Section 1.2.  Other Defined Terms.  Unless the context otherwise requires,
                   -------------------                                         
the following terms when used in this Amendment shall have the meanings assigned
to them in this Section 1.2.

     "Loan Agreement" shall mean the Original Agreement as amended hereby.

                                     - 1 -

                                                                   Exhibit 10.50
<PAGE>
 
                                  ARTICLE II.

                                  Amendments
                                  ----------

     Section 2.1.  Definitions.  Section 1.1 of the Original Agreement is hereby
                   -----------                                                  
amended by adding a new definition of "1995 Note Purchasers Group" to read as
follows:

          "'1995 Note Purchasers Group' means, collectively, The Variable
           ----------------------------                                  
Annuity Life Insurance Company, American General Life Insurance Company, Gulf
Life Insurance Company, First Allmerica Financial Life Insurance Company,
Allmerica Financial Life Insurance and Annuity Company, and The Mutual Life
Insurance Company of New York."


     The definition of "Debt Securities" contained in Section 1.1 of the
Original Agreement is hereby amended in its entirety to read as follows:

     "'Debt Securities' means collectively, (i) those senior notes dated October
       ---------------                                                          
27, 1992, September 22, 1993, December 27, 1993 and October 27, 1994 issued by
Borrower pursuant to that certain Master Shelf Agreement dated as of December
19, 1991 between Borrower and The Prudential Insurance Company of America (as
amended and restated from time to time, the "Shelf Agreement") and any
additional notes issued pursuant to the Shelf Agreement (ii) the 7.65% senior
notes due April 30, 2003 in the aggregate principal amount of $50,000,000 issued
by Borrower pursuant to various note purchase agreements among Borrower, MIGC,
MGTC, WGRS, WGRT and each member of the CIGNA Group, as amended and restated
from time to time, (iii) the 8.02% senior notes due November 29, 2005 in the
aggregate principal amount of $42,000,000 issued by Borrower pursuant to a note
purchase agreement among Borrower and members of the 1995 Note Purchasers Group
(as amended and restated from time to time, the "1995 Note Purchase Agreement")
and (iv) all other notes issued pursuant to note purchase agreements among any
Related Person and any member of the CIGNA Group, the members of the 1995 Note
Purchasers Group, Prudential Insurance Company of America, or any other
institutional investor."
 
     Section 2.2.  Books, Financial Statements and Reports.  Section 5.1(b) of
                   ---------------------------------------                    
the Original Agreement is hereby amended by adding a new clause (vi), to read as
follows:

          "(vi)  as soon as delivered to such Persons, all other reports,
     statements and notices delivered to any holder of Debt Securities."


     Section 2.3  Insurance.  Section 5.1(h) of the Original agreement is hereby
                  ---------                                                     
amended by deleting the second sentence thereof.

                                     - 2 -
<PAGE>
 
     Section 2.4.  Events of Default.  Section 7.1(l) of the Original Agreement
                   -----------------                                           
is hereby amended in its entirety to read as follows:

          "(l)  Without (i) the express prior written consent of all Lenders,
     Borrower amends or modifies the terms of any of the documents or
     instruments governing, or otherwise executed in connection with, any of the
     Debt Securities (a) shortening the maturity of such Debt Securities, (b)
     increasing the interest rate or fees payable under such Debt Securities or
     with respect to such Debt Securities, or (c) increasing the maximum
     principal amount of such Debt Securities, or (ii) the express prior written
     consent of Majority Lenders, Borrower amends or modifies any terms of any
     of the documents or instruments governing, or otherwise executed in
     connection with, any of the Debt Securities other than as set forth in the
     foregoing clause (i) of this subsection (l);  or"

 
                                 ARTICLE III.

                          Conditions of Effectiveness
                          ---------------------------

     Section 3.1.  Effective Date.  This Amendment shall become effective as of
                   --------------                                              
the date first above written when, and only when, Agent shall have received, at
Agent's office, (i) a counterpart of this Amendment executed and delivered by
Borrower and all Lenders and (ii) each of the following, each document
(unless otherwise indicated) being dated the date of receipt thereof by Agent,
duly authorized, executed and delivered, and in form and substance satisfactory
to Agent:

          (a)  a certificate of the Secretary of Borrower dated the date of this
     Amendment certifying that: (A) the resolutions adopted by the Board of
     Directors of Borrower attached as Exhibit 1 to the Omnibus Certificate of
     Borrower dated September 2, 1994 (the "Original Certificate") have not been
     amended or revoked, and continue in full force and effect, (B) the
     incumbency and authorization of the officers of Borrower authorized to sign
     Loan Documents, with signature specimens of such officers, contained in the
     Original Certificate has not been amended and continues in full force and
     effect, (C) copies of the certified charter documents of Borrower
     (including by-laws), attached as Exhibits H and O to the Original
     Certificate have not been amended or revoked since the date of the Original
     Certificate, and continue in full force and effect, (D) no Default that has
     not been expressly waived by Lenders exists on and as of the date hereof
     and (E) all of the representations and warranties set forth in Article IV
     hereof and Article IV of the Original Agreement are true and correct at and
     as of their respective times of effectiveness;

                                     - 3 -
<PAGE>
 
          (b)  a favorable opinion from Messr. John Walter, Esq., counsel for
     Borrower in a form acceptable to Lender; and

          (c)  such supporting documents as Agent may reasonably request.

                                  ARTICLE IV.

                         Representations and Warranties
                         ------------------------------

     Section 4.1.  Representations and Warranties of Borrower.  In order to
                   ------------------------------------------              
induce each Lender to enter into this Amendment, Borrower represents and
warrants to each Lender that:

          (a)  The representations and warranties contained in each subsection
     of Section 4.1 of the Original Agreement are true and correct at and as of
     the time of the effectiveness hereof, except for representations and
     warranties relating to rights of way and easements for the Katy Gas Storage
     Facility modified as set forth in Schedule 1 hereto.

          (b)  Borrower is duly authorized to execute and deliver this Amendment
     and is and will continue to be duly authorized to borrow monies and to
     perform its obligations under the Loan Agreement.  Borrower has duly taken
     all corporate action necessary to authorize the execution and delivery of
     this Amendment and to authorize the performance of the obligations of
     Borrower hereunder and thereunder.

          (c)  The execution and delivery by Borrower of this Amendment, the
     performance by Borrower of its obligations hereunder and the consummation
     of the transactions contemplated hereby do not and will not conflict with
     any provision of law, statute, rule or regulation or of the articles of
     incorporation and bylaws of Borrower, or of any material agreement,
     judgment, license, order or permit applicable to or binding upon Borrower,
     or result in the creation of any lien, charge or encumbrance upon any
     assets or properties of Borrower.  Except for those which have been
     obtained, no consent, approval, authorization or order of any court or
     governmental authority or third party is required in connection with the
     execution and delivery by Borrower of this Amendment or to consummate the
     transactions contemplated hereby.

          (d)  When duly executed and delivered, this Amendment and the Loan
     Agreement will be a legal and binding obligation of Borrower, enforceable
     in accordance with its terms, except as limited by bankruptcy, insolvency
     or similar laws of general application relating to the enforcement of
     creditors' rights and by equitable principles of general application.

          (e)  The audited annual Consolidated financial statements of Borrower
     dated as of December 31, 1994 and the

                                     - 4 -
<PAGE>
 
     unaudited quarterly Consolidated financial statements of Borrower dated as
     of September 30, 1995 fairly present Borrower's Consolidated financial
     position at such dates and the Consolidated results of Borrower's
     operations and changes in Borrower's Consolidated cash flow for the
     respective periods thereof.  Copies of such financial statements have
     heretofore been delivered to each Lender.  Since September 30, 1995, no
     material adverse change has occurred in the financial condition or
     businesses or in the Consolidated financial condition or businesses of
     Borrower.

                                  ARTICLE V.

                                 Miscellaneous
                                 -------------

     Section 5.1.  Consent to 1995 Note Purchase Agreement.  Each Lender
                   ---------------------------------------              
consents and agrees that the 8.02% senior notes issued by Borrower pursuant to
the 1995 Note Purchase Agreement comply with the provision of Section
5.2(b)(viii) of the Loan Agreement.

     Section 5.2.  Consent to Amendment to Shelf Agreement.  Each Lender
                   ---------------------------------------              
consents and agrees that the Shelf Agreement as modified by the amendment dated
November 29, 1995 complies with the provisions of Section 5.2(b)(viii) of the
Loan Agreement and each Lender further consents to such modifications for
purposes of Section 7.1(i) of the Loan Agreement.

     Section 5.3.  Ratification of Agreements.  The Original Agreement as hereby
                   --------------------------                                   
amended and each other Loan Document affected hereby are ratified and confirmed
in all respects.  Any reference to the Loan Agreement in any Loan Document shall
be deemed to be a reference to the Original Agreement as hereby amended.  The
execution, delivery and effectiveness of this Amendment shall not, except as
expressly provided herein, operate as a waiver of any right, power or remedy of
Agent or Lenders under the Loan Agreement or any other Loan Document nor
constitute a waiver of any provision of the Loan Agreement or any other Loan
Document.

     Section 5.4.  Survival of Agreements.  All representations, warranties,
                   ----------------------                                   
covenants and agreements of Borrower herein shall survive the execution and
delivery of this Amendment and the performance hereof, including without
limitation the making or granting of the Loans, and shall further survive until
all of the Obligations are paid in full.  All statements and agreements
contained in any certificate or instrument delivered by Borrower or any Related
Person hereunder or under the Loan Agreement to any Lender shall be deemed to
constitute representations and warranties by, and/or agreements and covenants
of, Borrower under this Amendment and under the Loan Agreement.

     Section 5.5.  Loan Documents.  This Amendment is a Loan Document, and all
                   --------------                                             
provisions in the Loan Agreement pertaining to Loan Documents apply hereto.

                                     - 5 -
<PAGE>
 
     Section 5.6.  Governing Law.  This Amendment shall be governed by and
                   -------------                                          
construed in accordance with the laws of the State of Texas and any applicable
laws of the United States of America in all respects, including construction,
validity and performance.

     Section 5.7.  Counterparts.  This Amendment may be separately executed in
                   ------------                                               
counterparts and by the different parties hereto in separate counterparts, each
of which when so executed shall be deemed to constitute one and the same
Amendment.

     IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
executed as of the date first written above by their duly authorized officers.

                                       WESTERN GAS RESOURCES, INC.
                                     
                                     
                                       By:/s/ John C. Walter
                                          ------------------
                                       Name:  John C. Walter
                                       Title: Executive Vice President
                                     
                                     
                                       NATIONSBANK OF TEXAS, N.A.
                                     
                                     
                                       By:/s/  Michele L. Jones
                                          ---------------------
                                          Name: Michele L. Jones
                                          Title: Vice President
                                     
                                     
                                       BANKERS TRUST COMPANY
                                       
                                     
                                       By:/s/  Mary Jo Jolly
                                          ---------------------
                                          Name: Mary Jo Jolly
                                          Title:  Assistant Vice     
                                          President
                                     
                                     
                                       BANK OF MONTREAL
                                       
                                     
                                       By:/s/ Michael P. Stuckey
                                          -------------------------
                                          Name: Michael P. Stuckey
                                          Title: Director, U.S.     
                                          Corporate Banking

                                     - 6 -
<PAGE>
 
                                  CIBC INC.


                                  By:/s/  Gary C. Gaskill
                                     -----------------------
                                     Name:  Gary C. Gaskill
                                     Title: Vice President

                                     - 7 -
<PAGE>
 
                                  SCHEDULE 1

Borrower hereby represents and warrants that, with respect to Western Gas
Resources Storage, Inc.'s Katy Hub and Gas Storage Facility: (a)  the
condemnation process relating to certain storage rights, rights-of-way and well
easements has not been completed and therefore, as of the date hereof, Western
Gas Resources Storage, Inc. has, with respect to such storage rights, rights-of-
way and well easements, only the right to the possession thereof (such right to
possession being sufficient to enable Western Gas Resources Storage, Inc. to
conduct its business and operations at the Katy Hub and Gas Storage Facility as
is currently conducted and as proposed to be conducted) and (b) when such
condemnation process is completed and Western Gas Resources Storage, Inc. has
paid all amounts determined to be due to the condemnee with respect thereto,
Western Gas Resources Storage, Inc. will obtain good and defensible title to
said storage rights, rights-of-way and well easements.

                                     - 8 -
<PAGE>
 
            CONFIRMATION, ACKNOWLEDGEMENT AND CONSENT OF GUARANTORS


     Each of the undersigned (collectively "Guarantors") hereby (i) acknowledges
and consents to the foregoing Sixth Amendment to Third Restated Loan Agreement
(Term); (ii) confirms the Restated Guaranty dated as of August 31, 1993 executed
by such Guarantor in favor of Agent and the Lenders pursuant to the Original
Agreement; and (iii) agrees that each of such Guarantor's obligations and
covenants with respect to such Restated Guaranty shall remain in full force and
effect after the execution of such Amendment.

     William J. Krysiak, Vice President-Finance of Western Gas Resources
Oklahoma, Inc., Western Gas Resources Texas, Inc., Western Gas Resources
Storage, Inc., Mountain Gas Resources, Inc., MGTC, Inc. and MIGC, Inc., is
executing this Confirmation, Acknowledgment and Consent of Guarantors in his
capacity of officer of each such corporation.

     Dated as of the 29th day of November, 1995.

                                  WESTERN GAS RESOURCES OKLAHOMA, INC.
                                  WESTERN GAS RESOURCES TEXAS, INC.
                                  WESTERN GAS RESOURCES STORAGE, INC.
                                  MOUNTAIN GAS RESOURCES, INC.
                                  MGTC, INC.
                                  MIGC, INC.
                                
                                
                                
                                  By:/s/ William J. Krysiak
                                     ----------------------
                                     William J. Krysiak,
                                     Vice President-Finance

                                     - 9 -

<PAGE>
 
         FOURTH AMENDMENT TO FIRST RESTATED LOAN AGREEMENT (REVOLVER)

     THIS FOURTH AMENDMENT TO FIRST RESTATED LOAN AGREEMENT (REVOLVER) (herein
called the "Amendment") made as of the 29th  day of November, 1995, by and among
Western Gas Resources, Inc., a Delaware corporation ("Borrower"), NationsBank of
Texas, N.A., a national banking association, as Agent ("Agent"), and NationsBank
of Texas, N.A., Bank of Montreal, CIBC Inc., Societe Generale, Southwest Agency,
The First National Bank of Boston, Colorado National Bank, Bank of America
National Trust and Savings Association and Credit Lyonnais Cayman Island Branch,
(herein, collectively referred to as "Lenders").

                             W I T N E S S E T H:

     WHEREAS, Borrower, Agent and Lenders have entered into that certain First
Restated Loan Agreement (Revolver) dated as of September 2, 1994, as amended by
that certain First Amendment to First Restated Loan Agreement (Revolver) dated
as of December 2, 1994, that certain Second Amendment to First Restated Loan
Agreement (Revolver) dated as of February 23, 1995 and that certain Third
Amendment to First Restated Loan Agreement (Revolver) dated as of July 19, 1995
(as amended to the date hereof, the "Original Agreement") for the purpose and
consideration therein expressed, whereby Lenders became obligated to make loans
to Borrower as therein provided; and

     WHEREAS, Borrower, Agent and Lenders desire to amend the Original Agreement
as expressly set forth herein;

     NOW, THEREFORE, in consideration of the premises and the mutual covenants
and agreements contained herein and in the Original Agreement and in
consideration of the loans which may hereafter be made by Lenders to Borrower,
and for other good and valuable consideration, the receipt and sufficiency of
which are hereby acknowledged, the parties hereto do hereby agree as follows:

                   ARTICLE I. -- Definitions and References
                                 --------------------------

     Section 1.1.  Terms Defined in the Original Agreement.  Unless the context
                   ---------------------------------------                     
otherwise requires or unless otherwise expressly defined herein, the terms
defined in the Original Agreement shall have the same meanings whenever used in
this Amendment.

                                      -1-

                                                                   Exhibit 10.51
<PAGE>
 
     Section 1.2.  Other Defined Terms.  Unless the context otherwise requires,
                   -------------------                                         
the following terms when used in this Amendment shall have the meanings assigned
to them in this Section 1.2.

          "Loan Agreement" shall mean the Original Agreement as amended hereby.

                           ARTICLE II. -- Amendments
                                          ----------
          Section 2.1.  Definitions.  Section 1.1 of the Original Agreement is
                        -----------                                           
hereby amended by adding a new definition of "1995 Note Purchasers Group" to
read as follows:

          "'1995 Note Purchasers Group' means, collectively, The Variable
           ----------------------------                                  
Annuity Life Insurance Company, American General Life Insurance Company, Gulf
Life Insurance Company, First Allmerica Financial Life Insurance Company,
Allmerica Financial Life Insurance and Annuity Company, and The Mutual Life
Insurance Company of New York."


     The definition of "Debt Securities" contained in Section 1.1 of the
Original Agreement is hereby amended in its entirety to read as follows:

     "'Debt Securities' means collectively, (i) those senior notes dated October
       ---------------                                                          
27, 1992, September 22, 1993, December 27, 1993 and October 27, 1994 issued by
Borrower pursuant to that certain Master Shelf Agreement dated as of December
19, 1991 between Borrower and The Prudential Insurance Company of America (as
amended and restated from time to time, the "Shelf Agreement") and any
additional notes issued pursuant to the Shelf Agreement (ii) the 7.65% senior
notes due April 30, 2003 in the aggregate principal amount of $50,000,000 issued
by Borrower pursuant to various note purchase agreements among Borrower, MIGC,
MGTC, WGRS, WGRT and each member of the CIGNA Group, as amended and restated
from time to time, (iii) the 8.02% senior notes due November 29, 2005 in the
aggregate principal amount of $42,000,000 issued by Borrower pursuant to a note
purchase agreement among Borrower and members of the 1995 Note Purchasers Group
(as amended and restated from time to time, the members of the "1995 Note
Purchase Agreement") and (iv) all other notes issued pursuant to note purchase
agreements among any Related Person and any member of the CIGNA Group, the 1995
Note Purchasers Group, Prudential Insurance Company of America, or any other
institutional investor."
 
     Section 2.2.  Books, Financial Statements and Reports.  Section 6.1(b) of
                   ---------------------------------------                    
the Original Agreement is hereby amended by adding a new clause (vi), to read as
follows:

                                      -2-
<PAGE>
 
          "(vi)  as soon as delivered to such Persons, all other reports,
     statements and notices delivered to any holder of Debt Securities."


     Section 2.3  Insurance.  Section 6.1(h) of the Original agreement is hereby
                  ---------                                                     
amended by deleting the second sentence thereof.

     Section 2.4.  Events of Default.  Section 8.1(l) of the Original Agreement
                   -----------------                                           
is hereby amended in its entirety to read as follows:

          "(l)  Without (i) the express prior written consent of all Lenders,
     Borrower amends or modifies the terms of any of the documents or
     instruments governing, or otherwise executed in connection with, any of the
     Debt Securities (a) shortening the maturity of such Debt Securities, (b)
     increasing the interest rate or fees payable under such Debt Securities or
     with respect to such Debt Securities, or (c) increasing the maximum
     principal amount of such Debt Securities, or (ii) the express prior written
     consent of Majority Lenders, Borrower amends or modifies any terms of any
     of the documents or instruments governing, or otherwise executed in
     connection with, any of the Debt Securities other than as set forth in the
     foregoing clause (i) of this subsection (l);  or"


                  ARTICLE III. -- Conditions of Effectiveness
                                  ---------------------------

     Section 3.1.  Effective Date.  This Amendment shall become effective as of
                   --------------                                              
the date first above written when, and only when, Agent shall have received, at
Agent's office, (i) a counterpart of this Amendment executed and delivered by
Borrower and all Lenders and (ii) each of the following, each document
(unless otherwise indicated) being dated the date of receipt thereof by Agent,
duly authorized, executed and delivered, and in form and substance satisfactory
to Agent:

          (a) a certificate of the Secretary of Borrower dated the date of this
     Amendment certifying that: (A) the resolutions adopted by the Board of
     Directors of Borrower attached as Exhibit 1 to the Omnibus Certificate of
     Borrower dated September 2, 1994 (the "Original Certificate") have not been
     amended or revoked, and continue in full force and effect, (B) the
     incumbency and authorization of the officers of Borrower authorized to sign
     Loan Documents, with signature specimens of such officers, contained in the
     Original Certificate has not been amended and continues in full force and
     effect, (C) copies of the certified charter documents of Borrower
     (including by-laws), attached as Exhibits H and O to the Original
     Certificate have not been amended or revoked since the date of the Original

                                      -3-
<PAGE>
 
     Certificate, and continue in full force and effect, (D) no Default that has
     not been expressly waived by Lenders exists on and as of the date hereof
     and (E) all of the representations and warranties set forth in Article IV
     hereof and Article V of the Original Agreement are true and correct at and
     as of their respective times of effectiveness;

          (b) a favorable opinion from Messr. John Walter, Esq., counsel for
     Borrower in a form acceptable to Lender; and

          (c) such supporting documents as Agent may reasonably request.

                ARTICLE IV. -- Representations and Warranties 
                               ------------------------------
                        
     Section 4.1.  Representations and Warranties of Borrower.  In order to
                   ------------------------------------------              
induce each Lender to enter into this Amendment, Borrower represents and
warrants to each Lender that:

          (a) The representations and warranties contained in each subsection of
     Section 5.1 of the Original Agreement are true and correct at and as of the
     time of the effectiveness hereof, except for the representations and
     warranties relating to rights of way and easements for the Katy Gas Storage
     facility modified as set forth in Schedule 1 hereto.

          (b) Borrower is duly authorized to execute and deliver this Amendment
     and is and will continue to be duly authorized to borrow monies and to
     perform its obligations under the Loan Agreement.  Borrower has duly taken
     all corporate action necessary to authorize the execution and delivery of
     this Amendment and to authorize the performance of the obligations of
     Borrower hereunder and thereunder.

          (c) The execution and delivery by Borrower of this Amendment, the
     performance by Borrower of its obligations hereunder and the consummation
     of the transactions contemplated hereby do not and will not conflict with
     any provision of law, statute, rule or regulation or of the articles of
     incorporation and bylaws of Borrower, or of any material agreement,
     judgment, license, order or permit applicable to or binding upon Borrower,
     or result in the creation of any lien, charge or encumbrance upon any
     assets or properties of Borrower.  Except for those which have been
     obtained, no consent, approval, authorization or order of any court or
     governmental authority or third party is required in connection with the
     execution and delivery by Borrower of this Amendment or to consummate the
     transactions contemplated hereby.

          (d) When duly executed and delivered, this Amendment and the Loan
     Agreement will be a legal and binding obligation of Borrower, enforceable
     in accordance with its

                                      -4-
<PAGE>
 
     terms, except as limited by bankruptcy, insolvency or similar laws of
     general application relating to the enforcement of creditors' rights and by
     equitable principles of general application.

          (e) The audited annual Consolidated financial statements of Borrower
     dated as of December 31, 1994 and the unaudited quarterly Consolidated
     financial statements of Borrower dated as of September 30, 1995 fairly
     present Borrower's Consolidated financial position at such dates and the
     Consolidated results of Borrower's operations and changes in Borrower's
     Consolidated cash flow for the respective periods thereof.  Copies of such
     financial statements have heretofore been delivered to each Lender.  Since
     September 30, 1995, no material adverse change has occurred in the
     financial condition or businesses or in the Consolidated financial
     condition or businesses of Borrower.

                          ARTICLE V. -- Miscellaneous
                                        -------------
                                 
     Section 5.1.  Consent to 1995 Note Purchase Agreement.  Each Lender
                   ---------------------------------------              
consents and agrees that the 8.02% senior notes issued by Borrower pursuant to
the 1995 Note Purchase Agreement comply with the provision of Section
6.2(b)(viii) of the Loan Agreement.

     Section 5.2.  Consent to Amendment to Shelf Agreement.  Each Lender
                   ---------------------------------------              
consents and agrees that the Shelf Agreement as modified by the amendment dated
November 29, 1995 complies with the provisions of section 6.2(b)(viii) of the
Loan Agreement and each Lender further consents to such modifications for
purposes of Section 8.1(i) of the Loan Agreement.

     Section 5.3.  Ratification of Agreements.  The Original Agreement as hereby
                   --------------------------                                   
amended and each other Loan Document affected hereby are ratified and confirmed
in all respects.  Any reference to the Loan Agreement in any Loan Document shall
be deemed to be a reference to the Original Agreement as hereby amended.  The
execution, delivery and effectiveness of this Amendment shall not, except as
expressly provided herein, operate as a waiver of any right, power or remedy of
Agent or Lenders under the Loan Agreement or any other Loan Document nor
constitute a waiver of any provision of the Loan Agreement or any other Loan
Document.

     Section 5.4.  Survival of Agreements.  All representations, warranties,
                   ----------------------                                   
covenants and agreements of Borrower herein shall survive the execution and
delivery of this Amendment and the performance hereof, including without
limitation the making or granting of the Loans, and shall further survive until
all of the Obligations are paid in full.  All statements and agreements
contained in any certificate or instrument delivered by Borrower or any Related
Person hereunder or under the Loan Agreement to any Lender shall be deemed to
constitute representations and

                                      -5-
<PAGE>
 
warranties by, and/or agreements and covenants of, Borrower under this Amendment
and under the Loan Agreement.

     Section 5.5.  Loan Documents.  This Amendment is a Loan Document, and all
                   --------------                                             
provisions in the Loan Agreement pertaining to Loan Documents apply hereto.

     Section 5.6.  Governing Law.  This Amendment shall be governed by and
                   -------------                                          
construed in accordance with the laws of the State of Texas and any applicable
laws of the United States of America in all respects, including construction,
validity and performance.

     Section 5.7.  Counterparts.  This Amendment may be separately executed in
                   ------------                                               
counterparts and by the different parties hereto in separate counterparts, each
of which when so executed shall be deemed to constitute one and the same
Amendment.

                                      -6-
<PAGE>
 
     IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
executed as of the date first written above by their duly authorized officers.


                                  WESTERN GAS RESOURCES, INC.


                                  By:/s/ John C. Walter
                                     ------------------
                                     Name:  John C. Walter
                                     Title:  Executive Vice 
                                     President


                                  NATIONSBANK OF TEXAS, N.A., as Agent, Issuing
                                  Bank and Lender


                                  By:/s/ Michele L. Jones
                                     --------------------
                                     Name: Michele L. Jones
                                     Title: Vice President


                                  BANK OF AMERICA NATIONAL TRUST AND SAVINGS
                                  ASSOCIATION
                                  

                                  By:/s/ Gary Tsuyuki
                                     -----------------
                                     Name: Gary Tsuyuki
                                     Title: Vice President

                                  BANK OF MONTREAL
                                  

                                  By:/s/ Michael P. Stuckey
                                     ----------------------
                                     Name: Michael P. Stuckey
                                     Title: Director, U.S.
                                     Corporate Banking

                                  THE FIRST NATIONAL BANK OF BOSTON
                                  

                                  By:/s/ Carol E. Holley
                                     -------------------
                                     Name: Carol E. Holley
                                     Title: Vice President

                                  CREDIT LYONNAIS CAYMAN ISLAND BRANCH


                                  By:/s/ Xavier Ratouis
                                     ------------------  
                                     Name: Xavier Ratouis
                                     Title: Authorized Signature

                                      -7-
<PAGE>
 
                                  CIBC INC.


                                  By:/s/  Gary C. Gaskill
                                     --------------------  
                                     Name: Gary C. Gaskill
                                     Title: Vice President

                                  COLORADO NATIONAL BANK
                                  

                                  By:/s/ Monte E. Deckerd
                                     --------------------  
                                     Name: Monte E. Deckerd
                                     Title: Vice President

                                  SOCIETE GENERALE, SOUTHWEST AGENCY


                                  By:/s/ Richard A. Erbert
                                     ---------------------  
                                     Name: Richard A. Erbert
                                     Title: Vice President

                                      -8-
<PAGE>
 
                                  SCHEDULE 1

Borrower hereby represents and warrants that, with respect to Western Gas
Resources Storage, Inc.'s Katy Hub and Gas Storage Facility: (a)  the
condemnation process relating to certain storage rights, rights-of-way and well
easements has not been completed and therefore, as of the date hereof, Western
Gas Resources Storage, Inc. has, with respect to such storage rights, rights-of-
way and well easements, only the right to the possession thereof (such right to
possession being sufficient to enable Western Gas Resources Storage, Inc. to
conduct its business and operations at the Katy Hub and Gas Storage Facility as
is currently conducted and as proposed to be conducted) and (b) when such
condemnation process is completed and Western Gas Resources Storage, Inc. has
paid all amounts determined to be due to the condemnee with respect thereto,
Western Gas Resources Storage, Inc. will obtain good and defensible title to
said storage rights, rights-of-way and well easements.
<PAGE>
 
            CONFIRMATION, ACKNOWLEDGEMENT AND CONSENT OF GUARANTORS


     Each of the undersigned (collectively "Guarantors") hereby (i) acknowledges
and consents to the foregoing Fourth Amendment to First Restated Loan Agreement
(Revolver) of even date herewith; (ii) confirms the Restated Guaranty dated as
of September 2, 1994 executed by such Guarantor in favor of Agent and the
Lenders pursuant to the Original Agreement; and (iii) agrees that each of such
Guarantor's obligations and covenants with respect to such Restated Guaranty
shall remain in full force and effect after the execution of such Amendment.

     William J. Krysiak, Vice President-Finance of Western Gas Resources
Oklahoma, Inc., Western Gas Resources Texas, Inc., Western Gas Resources
Storage, Inc., Mountain Gas Resources, Inc., MGTC, Inc. and MIGC, Inc., is
executing this Confirmation, Acknowledgment and Consent of Guarantors in his
capacity of officer of each such corporation.

     Dated as of the 29th day of November, 1995.

                         WESTERN GAS RESOURCES OKLAHOMA, INC.
                         WESTERN GAS RESOURCES TEXAS, INC.
                         WESTERN GAS RESOURCES STORAGE, INC.
                         MOUNTAIN GAS RESOURCES, INC.
                         MGTC, INC.
                         MIGC, INC.



                         By:/s/ William J. Krysiak
                            ----------------------
                            William J. Krysiak,
                           Vice President-Finance

<PAGE>
 
================================================================================


                          WESTERN GAS RESOURCES, INC.



                                  $42,000,000



                               8.02% SENIOR NOTES
                              DUE DECEMBER 1, 2005


                            NOTE PURCHASE AGREEMENT



                         Dated as of November 29, 1995

================================================================================

                                                                   Exhibit 10.52
<PAGE>
 
                                 TABLE OF CONTENTS

                            (Not Part of Agreement)

<TABLE> 
<CAPTION> 
                                                                            Page
                                                                            ----
<S>  <C>                                                                    <C> 
AUTHORIZATION OF ISSUE OF NOTES............................................... 1
     1.   Authorization of Issue of Notes..................................... 1

PURCHASE AND SALE OF NOTES.................................................... 1
     2.   Purchase and Sale of Notes.......................................... 1

CONDITIONS PRECEDENT.......................................................... 2
     3.   Conditions of Closing............................................... 2
     3A.  Certain Documents................................................... 2
     3B.  Representations and Warranties; No Default.......................... 2
     3C.  Purchase Permitted by Applicable Laws............................... 3
     3D.  Legal Matters....................................................... 3
     3E.  Proceedings......................................................... 4
     3F.  Amendment of Other Agreements....................................... 4
     3G.  Consent of Lenders.................................................. 4
     3H.  Fees Payable at Closing............................................. 4
     3I.  Private Placement Number............................................ 4
     3J.  Sale of Notes to Other Purchasers................................... 5

PREPAYMENTS................................................................... 5
     4.   Prepayments......................................................... 5
     4A.  Optional Prepayment With Yield-Maintenance Amount................... 5
     4B.  Notice of Optional Prepayment....................................... 5
     4C.  Application of Prepayments.......................................... 5
     4D.  Retirement of Notes................................................. 5

AFFIRMATIVE COVENANTS......................................................... 6
     5.   Affirmative Covenants............................................... 6
     5A.  Financial Statements................................................ 6
     5B.  Inspection of Property.............................................. 8
     5C.  Covenant to Secure Notes Equally.................................... 8
     5D.  Agreement Assuming Liability on Notes............................... 9
     5E.  Notice of Material Events........................................... 9
     5F.  Maintenance of Properties...........................................10
     5G.  Maintenance of Existence and Qualifications.........................10
     5H.  Insurance...........................................................10
</TABLE> 

                                       i
<PAGE>
 
<TABLE> 
<S>  <C>                                                                      <C> 
     5I.  Compliance with Agreements and Law..................................10
     5J.  Compliance with Environmental Laws..................................10
     5K.  Information Required by Rule 144A...................................11
     5L.  ERISA...............................................................11
     5M.  Guaranties..........................................................11

NEGATIVE COVENANTS............................................................12

     6.   Negative Covenants..................................................12
     6A.  Financial Covenants.................................................12
          6A(1)     Consolidated Tangible Net Worth...........................12
          6A(2)     Current Ratio.............................................12
          6A(3)     Debt Maintenance..........................................12
          6A(4)     Fixed Charge Coverage Ratio...............................12
     6B.  Dividend Limitation.................................................13
     6C.  Lien, Debt, and Other Restrictions..................................13
          6C(1)     Liens.....................................................13
          6C(2)     Debt......................................................14
          6C(3)     Limitation on Investments and New Businesses..............15
          6C(4)     Sale of Stock and Debt of Subsidiaries....................15
          6C(5)     Merger and Sale of Assets.................................16
          6C(6)     Lease Rentals.............................................17
          6C(7)     Limitation on Credit Extensions...........................17
          6C(8)     Contracts; Take-or-Pay Agreements.........................18
          6C(9)     Sale or Discount of Receivables...........................18
          6C(10)    Guaranties................................................18
          6C(11)    Transactions With Affiliates..............................19
          6C(12)    Panhandle Joint Venture Debt..............................19
     6D.  Issuance of Stock by Subsidiaries...................................19
     6E.  Other Agreements....................................................20

EVENTS OF DEFAULT.............................................................20
     7A.  Acceleration........................................................20
     7B.  Rescission of Acceleration..........................................23
     7C.  Notice of Acceleration or Rescission................................24
     7D.  Other Remedies......................................................24

REPRESENTATIONS, COVENANTS AND WARRANTIES.....................................24
     8.   Representations, Covenants and Warranties...........................24
     8A.  Organization........................................................24
     8B.  Financial Statements................................................24
     8C.  Actions Pending.....................................................25
     8D.  Outstanding Debt....................................................25
     8E.  Environmental Compliance............................................25
</TABLE> 

                                      ii
<PAGE>
 
<TABLE> 
<S>  <C>                                                                      <C>
     8F.  Taxes...............................................................26
     8G.  Conflicting Agreements and Other Matters............................26
     8H.  Offering of Notes...................................................26
     8I.  Regulation G, etc...................................................26
     8J.  ERISA...............................................................27
     8K.  Governmental Consent................................................27
     8L.  Title to Properties.................................................28
     8M.  Disclosure..........................................................28
     8N.  Delivery of Other Agreements........................................28
     8O.  Public Utility Holding Company Act; Federal Power Act...............28
     8P.  Investment Company Act..............................................29
     8Q.  Rank of Notes.......................................................29

REPRESENTATIONS OF THE PURCHASERS.............................................29
     9.   Representations of the Purchasers...................................29
     9A.  Nature of Purchase..................................................29
     9B.  Source of Funds.....................................................29

DEFINITIONS...................................................................30
     10.  Definitions.........................................................30
     10A. Yield-Maintenance Terms.............................................30
     10B. Other Terms.........................................................31
     10C. Accounting Terms and Determinations.................................40

MISCELLANEOUS.................................................................40
     11A. Note Payments.......................................................40
     11B. Expenses............................................................41
     11C. Consent to Amendments...............................................42
     11D  Solicitation of Noteholders.........................................43
     11E. Form, Registration, Transfer and Exchange of Notes; Lost Notes......43
     11F. Persons Deemed Owners; Participations...............................44
     11G. Survival of Representations and Warranties; Entire Agreement........44
     11H. Successors and Assigns..............................................44
     11I. Disclosure to Other Persons; Confidentiality........................45
     11J. Notices.............................................................45
     11K. Payments Due on Non-Business Days...................................45
     11L. Satisfaction Requirement............................................46
     11M. GOVERNING LAW.......................................................46
     11N. Limitation on Interest..............................................46
     11O. Severability........................................................46
     11P. Descriptive Headings................................................46
     11Q. Counterparts........................................................46
     11R. Binding Agreement...................................................46
</TABLE> 
 
                                      iii
<PAGE>
 
PURCHASER SCHEDULE
SCHEDULE 6C(2)  EXISTING DEBT
SCHEDULE 6C(8) EXISTING COUNTERPARTIES
SCHEDULE 8A  SUBSIDIARIES
EXHIBIT A FORM OF NOTE
EXHIBIT B FORM OF OPINION OF COMPANY'S COUNSEL
EXHIBIT C LIST OF AGREEMENTS RESTRICTING DEBT
EXHIBIT D FORM OF CONFIDENTIALITY LETTER
EXHIBIT E FORM OF GUARANTY
EXHIBIT F FORM OF INTERCREDITOR AGREEMENT
EXHIBIT G FORM OF ANNUAL CASH FLOW PROJECTION

                                      iv
<PAGE>
 
                          WESTERN GAS RESOURCES, INC.
                             12200 N. Pecos Street
                                Denver, CO 80234



                                                         As of November 29, 1995


To Each of the Purchasers Identified
on the Signature Pages of this Agreement


                               8.02% SENIOR NOTES

Ladies and Gentlemen:

          The undersigned, Western Gas Resources, Inc. (the "COMPANY"), hereby
agrees with each Purchaser as follows:

PARAGRAPH
1.   AUTHORIZATION OF ISSUE OF NOTES.

          1.    AUTHORIZATION OF ISSUE OF NOTES.  The Company will authorize the
issue of its senior promissory notes (the "NOTES") in the aggregate principal
amount of $42,000,000, to be dated the date of issue thereof, to mature December
1, 2005, to bear interest on the unpaid balance thereof from the date thereof
until the principal thereof shall have become due and payable at the rate of
8.02% per annum and on overdue payments at the rate specified therein, and to be
substantially in the form of EXHIBIT A attached hereto.  The term "NOTES" as
used herein shall include each Note delivered pursuant to any provision of this
Agreement and each Note delivered in substitution or exchange for any such Note
pursuant to any such provision.  CAPITALIZED TERMS USED HEREIN HAVE THE MEANINGS
SPECIFIED IN PARAGRAPH 10.

PARAGRAPH 2.    PURCHASE AND SALE OF NOTES.

          2.    PURCHASE AND SALE OF NOTES. The Company hereby agrees to sell to
each Purchaser and, subject to the terms and conditions herein set forth, each
Purchaser severally agrees to purchase from the Company, the aggregate principal
amount of Notes set forth opposite such Purchaser's name in the PURCHASER
SCHEDULE attached hereto at 100% of such aggregate principal amount.  The
Company will deliver to each Purchaser, at the offices of Baker & Botts, L.L.P.,
2001 Ross Avenue, Suite 800, Dallas, Texas 75201, one or more Notes registered
in such Purchaser's name or (if so specified) in the name of such Purchaser's
nominee, evidencing the aggregate principal amount of the Notes to be purchased
by such Purchaser and in the denomination or denominations
<PAGE>
 
specified with respect to such Purchaser's in the PURCHASER SCHEDULE attached
hereto, against payment of the purchase price thereof by wire transfer of
immediately available funds for credit to the Company's account #0180352922 at
NationsBank of Texas, N.A., ABA No. 1110-0002-5, 901 Main Street, Dallas, Texas
75202, on the date of closing, which shall be December 1, 1995 (the "CLOSING" or
the "DATE OF CLOSING").

PARAGRAPH 3.    CONDITIONS PRECEDENT.

          3.    CONDITIONS OF CLOSING.  Each Purchaser's obligation to purchase
and pay for the Notes to be purchased by such Purchaser hereunder is subject to
the satisfaction, on or before the Date of Closing, of the following conditions:

          3A. CERTAIN DOCUMENTS.  Each Purchaser shall have received the
following, each dated the Date of Closing unless otherwise indicated:

                (i)       The Notes to be purchased by such Purchaser;

                (ii)      A certificate of the Secretary or Assistant Secretary
          of each of the Company and each Guarantor certifying (a) the
          resolutions of the Board of Directors of each of the Company and the
          Guarantors approving this Agreement, the Notes and the Guaranties,
          respectively, and of all documents evidencing other necessary
          corporate action and governmental approvals, if any, with respect to
          this Agreement, the Notes and the Guaranties, and (b) the names and
          true signatures of the officers of the Company and the Guarantors
          authorized to sign this Agreement, the Notes and the Guaranties,
          respectively, and the other documents to be delivered hereunder;

                (iii)     Certified copies of the Certificate of Incorporation
          and bylaws of each of the Company and each Guarantor;

                (iv)      A favorable opinion of John C. Walter, General Counsel
          of the Company, reasonably satisfactory to such Purchaser and
          substantially in the form of EXHIBIT B attached hereto and as to such
          other matters as such Purchaser may reasonably request. The Company
          hereby directs such counsel to deliver such opinion, and understands
          and agrees that each Purchaser receiving such opinion will and is
          hereby authorized to rely on such opinion;

                (v)       A certified copy of the NationsBank Agreement and all
          amendments, modifications, consents or waivers with respect thereto;

                (vi)      A certified copy of the Master Shelf Agreement and all
          amendments, modifications, consents or waivers with respect thereto;

                                       2
<PAGE>
 
                (vii)     A certified copy of the 1993 Note Purchase Agreement
          and all amendments, modifications, consents or waivers with respect
          thereto;

                (viii)    A certified copy of the Receivables Purchase Agreement
          and all amendments, modifications, consents or waivers with respect
          thereto;

                (ix)      A certified copy of each guaranty or security
          agreement guaranteeing or securing the obligations of the Company
          under the NationsBank Agreement, the Master Shelf Agreement, the 1993
          Note Purchase Agreement or the Receivables Purchase Agreement and all
          amendments, modifications, consents or waivers with respect thereto;

                (x)       A copy of each Guaranty dated the date of issue
          thereof, duly executed by each Guarantor;

                (xi)      A copy of the Intercreditor Agreement dated the date
          of issue thereof, duly executed by each Person that is the beneficiary
          of an Existing Guaranty; and

                (xii)     A letter from NationsBanc Capital Markets, Inc., in
          form, scope and substance satisfactory to such Purchaser, regarding
          the limited nature of the offering of the Notes.

          3B. REPRESENTATIONS AND WARRANTIES; NO DEFAULT.  The representations
and warranties contained in paragraph 8 and in each Guaranty shall be true on
and as of the Date of Closing; there shall exist on the Date of Closing no Event
of Default or Default and no Default or Event of Default would result from the
issuance of the Notes on the Date of Closing; and the Company and each Guarantor
shall have delivered to such Purchaser an Officer's Certificate, dated the Date
of Closing, to both such effects.

          3C. PURCHASE PERMITTED BY APPLICABLE LAWS.  The purchase of and
payment for the Notes to be purchased by such Purchaser on the terms and
conditions herein provided (including the use of the proceeds of such Notes by
the Company) shall not violate any applicable law or governmental regulation
(including, without limitation, Section 5 of the Securities Act or Regulation G,
T or X of the Board of Governors of the Federal Reserve System) and shall not
subject such Purchaser to any tax, penalty, liability or other onerous condition
under or pursuant to any applicable law or governmental regulation, and such
Purchaser shall have received such certificates or other evidence as it may
reasonably request to establish compliance with this condition.

          3D. LEGAL MATTERS. Counsel to such Purchaser, including any special
counsel retained in connection with the purchase and sale of the Notes, shall be
satisfied as to all legal matters relating to such purchase and sale, and such
Purchaser shall have received from such counsel favorable opinions as to such
legal matters as such Purchaser may reasonably request.

                                       3
<PAGE>
 
          3E. PROCEEDINGS.  All corporate and other proceedings taken or
to be taken in connection with the transactions contemplated hereby and all
documents incident thereto shall be reasonably satisfactory in substance and
form to such Purchaser, and such Purchaser shall have received all such
counterpart originals or certified or other copies of such documents as such
Purchaser may reasonably request.

          3F. AMENDMENT OF OTHER AGREEMENTS.  Neither the NationsBank
Agreement, the Master Shelf Agreement, the 1993 Note Purchase Agreement nor the
Receivables Purchase Agreement shall require (or if so required, such conditions
shall simultaneously terminate) (i) the grant of a Lien on any property of the
Company or any Subsidiary (other than (a) Liens permitted by clauses (vi) and
(vii) of paragraph 6C(1) and (b) in the case of the Receivables Purchase
Agreement, Liens on the Pledged Accounts Receivable (subject to the proviso set
forth in the definition of "Permitted Securitization Program")) or (ii) the
delivery of any security agreement or the guaranty or agreement to provide
guaranties of the obligations of the Company under such agreements other than
(a) any Existing Guaranty which is subject to the Intercreditor Agreement and
for which such Purchaser shall have received a Guaranty from the same Guarantor
and (b) any other guaranty or agreement to provide guaranties of the obligations
of the Company under such agreements delivered after the Closing Date which
becomes subject to the Intercreditor Agreement (as the same may hereafter be
amended or otherwise modified) and for which such Purchaser shall have received
a Guaranty pursuant to paragraph 5M from the same Guarantor.  In addition, such
agreements shall not require that any lender or purchaser party thereto, or an
agent or representative thereof, be named as beneficiary or loss payee on any
insurance policy and all insurance policies of the Company and its Subsidiaries
shall not name any such lender or agent as beneficiary or loss payee.

          3G. CONSENT OF LENDERS. The Company shall have received any consents
required in connection with the execution, delivery and performance of this
Agreement, the Notes and the Guaranties by the NationsBank Agreement, the Master
Shelf Agreement, the 1993 Note Purchase Agreement or the Receivables Purchase
Agreement and shall have delivered to such Purchaser a copy thereof and a copy
of any amendment thereto (which must be satisfactory to such Purchaser) that is
entered into in connection with the transactions contemplated hereby.

          3H. FEES PAYABLE AT CLOSING.  Without limiting the generality of
paragraph 11B, the Company shall have paid on or before the Date of Closing the
fees, charges and disbursements of such Purchaser's special counsel referred to
in paragraph 3D to the extent reflected in a statement of such counsel rendered
to the Company at least three Business Days prior to the Closing.

          3I. PRIVATE PLACEMENT NUMBER.  The Company shall have obtained or
caused to be obtained a private placement number for the Notes from the CUSIP
Service Bureau of Standard & Poor's Corporation and such Purchaser shall have
been informed of such private placement numbers.

                                       4
<PAGE>
 
          3J. SALE OF NOTES TO OTHER PURCHASERS.  The Company shall have sold
to the other Purchasers the Note(s) to be purchased by them at the Closing and
shall have received payment in full therefor.

PARAGRAPH 4.    PREPAYMENTS.

          4.    PREPAYMENTS.  The Notes shall be subject to prepayment only with
respect to the optional prepayments permitted by paragraph 4A.

          4A. OPTIONAL PREPAYMENT WITH YIELD-MAINTENANCE AMOUNT.  The Notes
shall be subject to prepayment on any Business Day on or after 90 days from the
date of issuance thereof, in whole at any time or from time to time in part (in
multiples of $1,000,000), at the option of the Company, at 100% of the principal
amount so prepaid plus interest thereon to the prepayment date and the Yield-
Maintenance Amount, if any, with respect to each such Note.

          4B. NOTICE OF OPTIONAL PREPAYMENT.  The Company shall give the
holder of each Note to be prepaid pursuant to paragraph 4A irrevocable written
notice of such prepayment not less than 30 days, and not more than 60 days,
prior to the prepayment date (which shall be a Business Day), specifying such
prepayment date, specifying the aggregate principal amount of the Notes to be
prepaid on such date, identifying each Note held by such holder, and the
principal amount of each such Note, to be prepaid on such date, providing an
estimate (utilizing a Reinvestment Yield calculated as if the date of such
notice were the Settlement Date) of the Yield-Maintenance Amount, if any, to
become due on such prepayment date and the calculation of such estimate, and
stating that such prepayment is to be made pursuant to paragraph 4A.  Notice of
prepayment having been given as aforesaid, the principal amount of the Notes
specified in such notice, together with interest thereon to the prepayment date
and together with the Yield-Maintenance Amount, if any, herein provided, shall
become due and payable on such prepayment date and, on the Business Day next
preceding such prepayment date, the Company shall transmit by facsimile and by
overnight courier to the holder of each Note to be so prepaid the calculation of
the Yield-Maintenance Amount, if any, to be due on such prepayment date.

          4C. APPLICATION OF PREPAYMENTS.  In the case of each partial
prepayment pursuant to paragraph 4A of all outstanding Notes, the principal
amount to be prepaid shall be allocated to all Notes at the time outstanding
(including, for the purpose of this paragraph 4C only, all Notes prepaid or
otherwise retired or purchased or otherwise acquired by any Subsidiaries or
Affiliates of the Company other than by prepayment pursuant to paragraph 4A) in
proportion to the respective outstanding principal amounts thereof.

          4D. RETIREMENT OF NOTES.  The Company shall not, and shall not
permit any of its Subsidiaries or Affiliates to, prepay or otherwise retire in
whole or in part prior to their final maturities (other than by prepayment
pursuant to paragraph 4A or upon acceleration of such final maturity pursuant to
paragraph 7A), or purchase or otherwise acquire, directly or indirectly, Notes
held by any holder unless the Company or such Subsidiary or Affiliate shall have
offered to prepay

                                       5
<PAGE>
 
or otherwise retire or purchase or otherwise acquire, as the case may be, the
same proportion of the aggregate principal amount of Notes held by each other
holder of Notes at the time outstanding upon the same terms and conditions.  Any
Notes so prepaid or otherwise retired or purchased or otherwise acquired by the
Company or any of its Subsidiaries or Affiliates shall not be deemed to be
outstanding for any purpose under this Agreement, except as provided in
paragraph 4C.

PARAGRAPH 5.    AFFIRMATIVE COVENANTS.

          5.    AFFIRMATIVE COVENANTS.  So long as any Note shall remain unpaid,
the Company covenants that:

          5A. FINANCIAL STATEMENTS.  The Company will deliver to the holder of
each Note in duplicate:

                (i)      as soon as practicable and in any event within 45 days
          after the end of each quarterly period (other than the last quarterly
          period) in each fiscal year, a consolidating and consolidated
          statement of operations and statement of cash flows of the Company and
          its Subsidiaries for such quarterly period and for the period from the
          beginning of the current fiscal year to the end of such quarterly
          period, and a consolidating and consolidated balance sheet of the
          Company and its Subsidiaries as at the end of such quarterly period,
          setting forth in each case in comparative form figures for the
          corresponding period in the preceding fiscal year, all in reasonable
          detail and certified by an authorized financial officer of the
          Company, subject to changes resulting from year-end adjustments;
          PROVIDED, however, that delivery pursuant to clause (iv) below of
          copies of the Quarterly Report on Form 10-Q of the Company for such
          quarterly period filed with the Securities and Exchange Commission
          shall be deemed to satisfy the requirements of this clause (i) with
          respect to consolidated financial statements if such Quarterly Report
          contains such financial statements;

                (ii)     as soon as practicable and in any event within 90 days
          after the end of each fiscal year, a consolidating and consolidated
          statement of operations and statement of cash flows of the Company and
          its Subsidiaries for such year, and a consolidating and consolidated
          balance sheet of the Company and its Subsidiaries as at the end of
          such year, setting forth in each case in comparative form
          corresponding consolidated figures from the preceding annual audit,
          all in reasonable detail and reasonably satisfactory in scope to the
          Required Holder(s) and, as to the consolidated statements, certified
          to the Company by independent public accountants of recognized
          national standing selected by the Company whose certificate shall be
          in scope and substance reasonably satisfactory to the Required
          Holder(s) and, as to the consolidating statements, certified by an
          authorized financial officer of the Company; PROVIDED, however, that
          delivery pursuant to clause (iv) below of copies of the Annual Report
          on Form 10-K of the Company for such fiscal year filed with the

                                       6
<PAGE>
 
          Securities and Exchange Commission shall be deemed to satisfy the
          requirements of this clause (ii) with respect to consolidated
          financial statements if such Annual Report contains such financial
          statements;

                (iii)    as soon as practicable, and in any event within 105
          days after the end of each fiscal year of MIGC, complete consolidated
          and consolidating (if applicable) financial statements of each of
          MIGC, MGTC and any other Subsidiary that owns or operates pipelines
          subject to state or federal rate regulation and has annual revenues in
          excess of $5,000,000, together with all notes thereto, prepared in
          reasonable detail in accordance with regulations promulgated by the
          Federal Energy Regulatory Commission in the case of MIGC and
          regulations promulgated by the Wyoming Public Service Commission in
          the case of MGTC, together with an opinion regarding MIGC, based on
          audits using generally accepted auditing standards, of independent
          certified public accountants of recognized national standing stating
          that such consolidated financial statements have been so prepared;
          such consolidated financial statements shall contain a balance sheet
          as of the end of such fiscal year and statements of operations and
          cash flows, and of changes in stockholders' equity for such fiscal
          year, each setting forth in comparative form the corresponding figures
          for the preceding fiscal year;

                (iv)     promptly upon transmission thereof, copies of all such
          financial statements, proxy statements, press releases, notices and
          reports as it shall send to its public stockholders and copies of all
          registration statements (without exhibits) and all reports which it
          files with the Securities and Exchange Commission (or any governmental
          body or agency succeeding to the functions of the Securities and
          Exchange Commission);

                (v)      prior to April 30 in each year, a projection of the
          consolidated cash flows of the Company, its Subsidiaries and the joint
          ventures in which the Company or its Subsidiaries has an investment
          for the current fiscal year, in the form of EXHIBIT G attached hereto;

                (vi)     as soon as delivered to such Persons, all other
          reports, statements and notices delivered to (a) the agent, or the
          other lenders under the NationsBank Agreement or (b) if the
          NationsBank Agreement is no longer in effect, the lenders under the
          Company's major bank credit facility; and

                (vii)    as soon as practicable after receipt thereof, a copy of
          each other report submitted to the Company by independent accountants
          in connection with any annual, interim or special audit made by them
          of the books of the Company at any time during which the Company is
          not required to file periodic reports with the Securities and Exchange
          Commission pursuant to section 13 or 15(d) of the Exchange Act; and

                                       7
<PAGE>
 
                (viii)   with reasonable promptness, such other information as
          the holder of any Note may reasonably request.

Together with each delivery of financial statements required by clauses (i) and
(ii) above, the Company will deliver to the holder of each Note an Officer's
Certificate demonstrating (with computations in reasonable detail) compliance by
the Company and its Subsidiaries with the provisions of paragraphs 6A(l), 6A(2),
6A(3), 6A(4), 6B, 6C(l), 6C(2), 6C(3), 6C(4), 6C(5), 6C(6), and 6C(7) and
stating that there exists no Event of Default or Default, or, if any Event of
Default or Default exists, specifying the nature and period of existence thereof
and what action the Company proposes to take with respect thereto.  Together
with each delivery of financial statements required by clause (ii) above, the
Company will deliver to the holder of each Note a certificate of such
accountants stating that, in making the audit necessary to the certification of
such financial statements, they have obtained no knowledge of any Event of
Default or Default, or, if they have obtained knowledge of any Event of Default
or Default, specifying the nature and period of existence thereof.  Such
accountants, however, shall not be liable to anyone by reason of their failure
to obtain knowledge of any Event of Default or Default which would not be
disclosed in the course of an audit conducted in accordance with generally
accepted auditing standards.

          The Company also covenants that forthwith upon the chief executive
officer, chief financial officer, Vice President-Finance, Executive Vice
President-General Counsel, Treasurer or President of the Company obtaining
knowledge of an Event of Default or Default, it will deliver to the holder of
each Note an Officer's Certificate specifying the nature and period of existence
thereof and what action the Company proposes to take with respect thereto.

          5B. INSPECTION OF PROPERTY.  The Company will permit any Person
designated by the holder of any Note in writing, at such holder's expense, to
visit and inspect any of the properties of the Company and its Subsidiaries
while accompanied by personnel of the Company or a Subsidiary, to examine the
corporate books and financial records of the Company and its Subsidiaries and
make copies thereof or extracts therefrom and to discuss the affairs, finances
and accounts of any of such corporations with the principal officers of the
Company and its independent public accountants, all at such reasonable times and
as often as such holder may reasonably  request, PROVIDED, that each Person so
designated by any holder to visit and inspect any properties shall, by virtue of
such designation, be deemed to have agreed to comply with the Company's on-site
safety procedures that are applicable to such properties.  If at the time of any
such inspection a Default or an Event of Default exists, the Company shall pay
all reasonable out of pocket costs incurred by each holder in connection with
such inspection.

          5C. COVENANT TO SECURE NOTES EQUALLY.  The Company covenants that,
if it or any Subsidiary shall create or assume any Lien upon any of its property
or assets, whether now owned or hereafter acquired, other than Liens permitted
by the provisions of paragraph 6C(l) (unless prior written consent to the
creation or assumption thereof shall have been obtained pursuant to paragraph
11C), it will make or cause to be made effective provision whereby the Notes
will be secured by such Lien equally and ratably with any and all other Debt
thereby secured so long as any

                                       8
<PAGE>
 
such other Debt shall be so secured pursuant to such agreements and instruments
as shall be approved by the Required Holder(s), and the Company will cause to be
delivered to each holder of a Note an opinion of independent counsel to the
effect that such agreements and instruments are enforceable in accordance with
their terms, and in any such case the Notes shall have the benefit, to the full
extent that, and with such priority as, the holders of Notes may be entitled
under applicable law, of an equitable Lien on such property or assets securing
the Notes.  A violation of paragraph 6C(1) will constitute an Event of Default
hereunder, whether or not any such provision is made pursuant to this paragraph
5C.

          5D. AGREEMENT ASSUMING LIABILITY ON NOTES.  The Company covenants
that, if at any time any Person should become liable (as co-obligor, endorser,
guarantor or surety), on any other obligation of the Company or any obligation
of any Subsidiary (other than (i) obligations incurred in the ordinary course of
business evidencing guaranties of gas purchases, transportation fees and
construction contracts, (ii) surety bonds, appeal bonds and construction bonds
(including bonds necessary for right-of-way condemnation and bonds issuable upon
appeals of judgments or in relation to injunctions or temporary restraining
orders) incurred in the ordinary course of business, (iii) letter of credit
reimbursement obligations with respect to letters of credit issued in the
ordinary course of business but not for borrowed money, and (iv) endorsements of
negotiable instruments for collection in the ordinary course of business), the
Company will, at the same time, cause such Person to deliver to each holder of
Notes an agreement as shall be approved by Required Holder(s) pursuant to which
such Person becomes similarly liable on the Notes.

          5E. NOTICE OF MATERIAL EVENTS.  The Company will promptly notify the
holder of each Note of (i) any material adverse change in the Company's
business, property or assets, financial condition or results of operations or
the Company's consolidated business, property or assets, financial condition or
results of operations, (ii) the acceleration of the maturity of any Debt owed by
the Company or any of its Subsidiaries or any default by the Company or any of
its Subsidiaries under any indenture, mortgage, agreement, contract or other
instrument to which any of them is a party or by which any of them or any of
their properties is bound, if such acceleration or default would have a material
adverse effect upon the Company's consolidated business, property or assets,
financial condition or results of operations, (iii) any material adverse claim
(or any claim of $5,000,000 or more) asserted against the Company or any of its
Subsidiaries or with respect to the Company's or any Subsidiary's properties,
(iv) the occurrence of any Termination Event or of any event or condition known
to the Company which might adversely affect the enforceability of this Agreement
or any Note and (v) the filing of any suit or proceeding against the Company or
any of its Subsidiaries in which an adverse decision could have a material
adverse effect upon the Company's or any Subsidiary's business, property or
assets, financial condition, or results of operations. Upon the occurrence of
any of the foregoing the Company will, and will cause each such Subsidiary to,
take all necessary or appropriate steps to remedy promptly any such material
adverse change, Default, Event of Default or default, to protect against any
such adverse claim, to defend any such suit or proceeding, to remedy any such
Termination Event or event affecting enforceability, and to resolve all
controversies on account of any of the foregoing.

                                       9
<PAGE>
 
          5F. MAINTENANCE OF PROPERTIES.  The Company will, and will cause
each of its Subsidiaries to, maintain, preserve, protect and keep all material
property used or useful in the conduct of its business in good condition and in
compliance with all applicable laws, rules and regulations and will from time to
time make all repairs, renewals and replacements needed to enable the business
and operations carried on in connection therewith to be promptly and
advantageously conducted at all times.

          5G. MAINTENANCE OF EXISTENCE AND QUALIFICATIONS.  The Company
will, and will cause each of its Subsidiaries to, maintain and preserve its
corporate existence and its rights and franchises in full force and effect and
will qualify to do business as a foreign corporation in all states or
jurisdictions where required by applicable law, except where the failure so to
qualify will not have any material adverse effect on the business, property or
assets, financial condition or result of operations of the Company and its
Subsidiaries, taken as a whole.

          5H. INSURANCE.  The Company will, and will cause each of its
Subsidiaries and each of its Affiliates that is controlled by the Company or its
Subsidiaries to, maintain insurance with responsible and reputable insurance
companies or associations in such amounts covering such risks as is usually
carried by companies of similar size as the Company engaged in similar
businesses and owning similar properties in the same general areas in which the
Company or such Subsidiary or Affiliate operates.

          5I. COMPLIANCE WITH AGREEMENTS AND LAW.  The Company will, and will
cause each of its Subsidiaries and each of its Affiliates that is controlled by
the Company or its Subsidiaries to, perform all material obligations it is
required to perform under the terms of each indenture, mortgage, deed of trust,
security agreement, lease, franchise, agreement, contract or other instrument or
obligation to which it is a party or by which it or any of its properties is
bound. The Company will, and will cause each of its Subsidiaries and each of its
Affiliates that is controlled by the Company or its Subsidiaries to, conduct its
business and affairs in compliance with all laws, regulations, and orders
applicable thereto, such compliance to include, without limitation, paying
before the same become delinquent all taxes, assessments and governmental
charges imposed upon it or upon its property except to the extent contested in
good faith by appropriate proceedings and for which adequate reserves have been
established in accordance with generally accepted accounting principles except
where noncompliance would not materially adversely affect the business, property
or assets, financial condition or results of operations of the Company and its
Subsidiaries, taken as a whole.

          5J. COMPLIANCE WITH ENVIRONMENTAL LAWS.  The Company will, and will
cause each of its Subsidiaries and each of its Affiliates that is controlled by
the Company or its Subsidiaries to, comply in a timely fashion with, or operate
pursuant to valid waivers of the provisions of, all applicable federal, state
and local environmental, or pollution-control laws, regulations, orders and
decrees governing, without limitation, the emission of wastewater effluent,
solid and hazardous waste and air pollution, and setting forth general
environmental conditions together with any other applicable requirements for
conducting, on a timely basis, periodic tests and monitoring for contamination
of ground water, surface water, air and land and for biological toxicity of the
aforesaid,

                                      10
<PAGE>
 
and diligently comply with the applicable regulations (except to the extent such
regulations are waived by appropriate governmental authorities) of the
Environmental Protection Agency or other relevant federal, state or local
governmental authority except where noncompliance would not materially adversely
affect the business, property or assets, financial condition or results of
operations of the Company and its Subsidiaries, taken as a whole.  The Company
shall not be deemed to have breached or violated the preceding sentence of this
paragraph 5J if the Company, any Subsidiary or any Affiliate of the Company is
challenging in good faith by appropriate proceedings diligently pursued the
application or enforcement of any such governmental requirements for which
adequate reserves have been established in accordance with generally accepted
accounting principles.  TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, THE
COMPANY AGREES TO INDEMNIFY AND HOLD EACH HOLDER OF NOTES AND THEIR RESPECTIVE
OFFICERS, AGENTS AND EMPLOYEES HARMLESS FROM ANY LOSS, LIABILITY, CLAIM OR
EXPENSES THAT SUCH HOLDER OR ANY SUCH OFFICER, AGENT OR EMPLOYEE MAY INCUR OR
SUFFER AS A RESULT OF A BREACH BY THE COMPANY, ITS SUBSIDIARIES OR AFFILIATES,
AS THE CASE MAY BE, OF THIS COVENANT.

          5K. INFORMATION REQUIRED BY RULE 144A.  The Company will, upon the
request of the holder of any Note, provide such holder, and any qualified
institutional buyer designated by such holder, such financial and other
information as such holder may reasonably determine to be necessary in order to
permit compliance with the information requirements of Rule 144A under the
Securities Act in connection with the resale of Notes, except at such times as
the Company is subject to and in compliance with the reporting requirements of
section 13 or 15(d) of the Exchange Act. For the purpose of this paragraph 5K,
the term "qualified institutional buyer" shall have the meaning specified in
Rule 144A under the Securities Act.

          5L. ERISA.  The Company will promptly pay and discharge, and will
cause its Subsidiaries promptly to pay and discharge, all obligations and
liabilities arising under ERISA of a character which if unpaid or unperformed
might result in the imposition of a lien against any of its property and will
promptly notify the holder of each Note of (i) the occurrence of any reportable
event (as defined in ERISA) which might result in the termination by the PBGC of
any Plan covering any officers or employees of the Company or of any Subsidiary,
any benefits of which are, or are required to be, guaranteed by the PBGC, (ii)
receipt of any notice from the PBGC of its intention to seek termination of any
such Plan or appointment of a trustee therefor, and (iii) its intention to
terminate or withdraw from any Plan. The Company will not, and will not permit
any Subsidiary to, terminate any such Plan or withdraw therefrom unless it shall
be in compliance with all of the terms and conditions of this Agreement after
giving effect to any liability to the PBGC resulting from such termination or
withdrawal.

          5M. GUARANTIES.  The Company shall require each Subsidiary that
guarantees any obligations of the Company under the NationsBank Agreement, the
Master Shelf Agreement, the 1993 Note Purchase Agreement or the Receivables
Purchase Agreement to immediately execute and deliver to any holder of Notes a
Guaranty.  The Company will cause each such Subsidiary to deliver

                                      11
<PAGE>
 
to each holder of the Notes, simultaneously with its delivery of such a
Guaranty, written evidence satisfactory to the Required Holder(s) and their
counsel that such Subsidiary has taken all corporate or partnership action
necessary to duly approve and authorize its execution, delivery and performance
of such Guaranty and other documents which it is required to execute.

PARAGRAPH 6.    NEGATIVE COVENANTS.

          6.    NEGATIVE COVENANTS.  So long as any Note shall remain unpaid,
the Company covenants that:

          6A. FINANCIAL COVENANTS.  The Company will not permit:

                6A.(1) CONSOLIDATED TANGIBLE NET WORTH.  Consolidated Tangible
Net Worth at any time to be less than $340,000,000 plus an amount equal to 50%
of Consolidated Net Earnings subsequent to June 30, 1995 (but only to the extent
such amount is a positive number) plus an amount equal to 75 % of the net cash
proceeds received by the Company from the sale by the Company of any shares of
its stock after June 30, 1995;

                6A.(2) CURRENT RATIO.  The ratio of Consolidated Current
Assets to Consolidated Current Liabilities to be less than 1.0 to 1.0 at any
time. For the purposes of determining compliance with this paragraph 6A(2), (x)
"Consolidated Current Liabilities" will be calculated without including any
payments of principal of any Funded Debt of the Company which are required to be
repaid within one year from the time of calculation and (y) "Consolidated
Current Assets" shall include the amount of funds that are available to be
borrowed under the Revolving Loan Agreement, where "available" means, as of the
date of determination, the banks parties to the Revolving Loan Agreement are
committed to advance such funds, no default exists under the Revolving Loan
Agreement and all conditions to such banks advancing such funds would be
satisfied. The Purchasers acknowledge that the Company currently calculates the
current ratio only as of the end of each calendar month;

                6A.(3) DEBT MAINTENANCE.  Adjusted Consolidated Debt at any
time to exceed (i) from the Date of Closing through October 31, 1996, 60% of
Consolidated Net Tangible Assets, (ii) from November 1, 1996 through October 31,
1997, 57.5% of Consolidated Net Tangible Assets, and (iii) at any time after
October 31, 1997, 55% of Consolidated Net Tangible Assets. In any event, for
purposes of determining compliance with this paragraph 6A(3), Adjusted
Consolidated Debt shall include without limitation all indebtedness included in
determining compliance with the similar covenant in the NationsBank Agreement;
and

                6A.(4) FIXED CHARGE COVERAGE RATIO.  For any fiscal
quarter, the ratio of (i) the sum of (a) the Consolidated Net Earnings of the
Company for the four immediately preceding fiscal quarters of the Company PLUS
(b) the Company's consolidated interest expense, provision for income taxes,
depreciation and amortization for the four immediately preceding fiscal quarters
of the Company that were taken into account in determining such consolidated
earnings PLUS (c) for each

                                      12
<PAGE>
 
calculation that includes the Company's fiscal quarter ending June 30, 1995,
that certain $2,000,000 restructuring charge taken by the Company in its fiscal
quarter ending June 30, 1995 as a result of the Company's general and
administrative reductions, TO (ii) the Company's accrued consolidated interest
expense for the four immediately preceding fiscal quarters, to be less than (x)
3.00 to 1.00 for the period commencing on the Date of Closing and ending on
October 31, 1996, (y) 3.25 to 1.00 for the period commencing November 1, 1996
and ending October 31,  1997 and (z) 3.75 to 1.00 at any time after October 31,
1997.

          6B. DIVIDEND LIMITATION.  The Company will not make any Restricted
Payment except out of Consolidated Net Earnings Available for Restricted
Payments and unless no Default or Event of Default exists before such Restricted
Payment is made and no Default or Event of Default would exist immediately after
such Restricted Payment is made.

          6C. LIEN, DEBT, AND OTHER RESTRICTIONS.  The Company will not and
will not permit any Subsidiary to:

                6C.(1) LIENS.  Create, assume or suffer to exist any
Lien upon any of its properties or assets, whether now owned or hereafter
acquired (whether or not provision is made for the equal and ratable securing of
the Notes in accordance with the provisions of Paragraph 5C), EXCEPT

                (i)      Liens for taxes not yet due or which are being actively
          contested in good faith by appropriate proceedings,

                (ii)     other statutory Liens incidental to the conduct of its
          business or the ownership of its property and assets (including
          landlord liens) that are not incurred in connection with the borrowing
          of money or the obtaining of advances or credit or guaranteeing the
          obligations of a Person, and which do not in the aggregate materially
          detract from the value of its property or assets or materially impair
          the use thereof in the operation of its business,

                (iii)    Liens on property or assets of a Subsidiary to secure
          obligations of such Subsidiary to the Company or a Wholly Owned
          Subsidiary,

                (iv)     existing Liens on property of the Company or any
          Subsidiary described in SCHEDULE 6C(2) attached hereto and securing
          Debt permitted by subclause (a) of clause (ii) of paragraph 6C(2),

                (v)      in the case of transactions that occur after the date
          hereof, Liens existing on any real property of any corporation at the
          time it becomes a Subsidiary, or existing prior to the time of
          acquisition upon any property acquired by the Company or any
          Subsidiary through purchase, merger or consolidation or otherwise,
          whether or not assumed by the Company or such Subsidiary, or placed on
          property

                                      13
<PAGE>
 
          at the time of acquisition by the Company or any Subsidiary to secure
          all or a portion of (or to secure Debt incurred to pay all or a
          portion of) the purchase price thereof, PROVIDED that (a) such
          property is not or shall not thereby become encumbered in any amount
          in excess of the lesser of the cost thereof or Fair Market Value
          thereof and (b) any such Lien shall not encumber any other property of
          the Company or such Subsidiary,

                (vi)     Liens on deposit and other bank accounts of the Company
          created by the right of a lender party to the NationsBank Agreement to
          offset obligations of the Company owing thereunder against such
          accounts, if, and only if, there is no agreement between any such
          lender and the Company which requires the Company to maintain any
          deposit or other funds in any account with such lender other than as
          provided in clause (vii) below,

                (vii)    Liens on deposits of the Company under the NationsBank
          Agreement to secure the face amount of outstanding letters of credit
          issued pursuant to the NationsBank Agreement,

                (viii)   Liens on the Pledged Accounts Receivable securing sales
          or transfers of accounts receivable pursuant to the Permitted
          Securitization Program, and

                (ix)     other Liens on the property of the Company,

PROVIDED that the aggregate amount of Debt secured by Liens permitted by clauses
(iv), (v), (viii) (to the extent of the Over-Collateralization Amount) and (ix),
together with the amount of undrawn letters of credit subject to the obligation
to provide deposits referred to in clause (vii), whether or not such deposits
have been provided, does not exceed at any time an amount in excess of 5% of
Consolidated Tangible Net Worth.

                6C.(2) DEBT.  Create, incur, assume or suffer to exist any
Debt, EXCEPT

                (i)      Debt of the Company represented by the Notes,

                (ii)     (a) Debt of the Company or any Subsidiary to third
     parties described in SCHEDULE 6C(2) attached hereto which shall not be
     renewed, extended or permitted to remain outstanding after the stated
     maturities thereof, (b) Debt of the Company or any Subsidiary to third
     parties secured by Liens permitted by the provisions of clauses (v), (viii)
     (to the extent of the Over-Collateralization Amount) and (ix) of paragraph
     6C(l) and (c) the amount of undrawn letters of credit permitted by clause
     (vii) of paragraph 6C(1), PROVIDED that the aggregate amount of the Debt
     described in this clause (ii) of paragraph 6C(2) does not exceed at any
     time an amount equal to 5% of Consolidated Tangible Net Worth.

                                      14
<PAGE>
 
                (iii)    Debt of any Subsidiary to the Company or any other
          Wholly Owned Subsidiary, and Debt of the Company to any Subsidiary, in
          each case arising from an extension of credit, advance or loan
          permitted by clause (ii) of paragraph 6C(7),

                (iv)     other Debt of the Company not prohibited by 6A(3), and

                (v)      Debt of the Guarantors represented by the Existing
          Guaranties and the Guaranties.

          6C.(3)       LIMITATION ON INVESTMENTS AND NEW BUSINESSES.  (i) Make
any expenditure or commitment or incur any obligation or enter into or engage in
any transaction except in the ordinary course of business (which shall be deemed
to include expenditures, commitments, obligations and transactions permitted by
clause (iii) or clause (iv) of this paragraph 6C(3)); (ii) engage directly or
indirectly in any business or conduct any operations except in connection with
or incidental to its present businesses and operations (which shall be deemed to
include electric power generation and marketing and expenditures, commitments,
obligations and transactions permitted by clause (iii) or clause (iv) of this
paragraph 6C(3)); (iii) make any acquisitions of, capital contributions to, or
other investments in, any Persons which exceed in the aggregate $500,000 other
than (a) capital contributions to and investments in Wholly Owned Subsidiaries,
(b) acquisitions of equity in corporations or partnerships having as their
primary business gas processing, transmission and gathering, oil and gas
production and storage or gas marketing and related activities or electric power
generation and marketing which do not exceed in the aggregate 10% of
Consolidated Net Tangible Assets and (c) deposits with, investments in,
obligations of and time deposits in any domestic bank or domestic branches of
foreign banks which, at the time such deposit or investment is made, are rated A
or better by Standard & Poor's or Moody's or B or better by Thompson Bank Watch
and investments maturing within one year from the date of acquisition in direct
obligations of or obligations supported by, the full faith and credit of, the
United States of America; or (iv) make any acquisition or investment in any
properties other than gas processing, transmission and gathering facilities,
domestic oil and gas properties, gas storage facilities, gas inventory and
electric power generation facilities which exceeds $5,000,000; PROVIDED,
however, that the loans referred to in paragraph 6C(7) may be outstanding.

          6C.(4)       SALE OF STOCK AND DEBT OF SUBSIDIARIES.  Sell or
otherwise dispose of, or part with control of, any shares of stock or Debt of
any Subsidiary, except to the Company or another Wholly Owned Subsidiary, and
except that all shares of stock and Debt of any Subsidiary at the time owned by
or owed to the Company and all Subsidiaries may be sold as an entirety for a
cash consideration which represents the fair value (as determined in good faith
by the Board of Directors of the Company) at the time of sale of the shares of
stock and Debt so sold, PROVIDED that (i) the assets of such Subsidiary together
with (ii) the assets of all other Subsidiaries the stock or Debt of which was
sold or otherwise disposed of in the preceding 12-month period and (iii) the
assets of the Company and its Subsidiaries sold, leased, transferred or
otherwise disposed of pursuant to clause (v) of paragraph 6C(5) in the preceding
12-month period (in each transaction measured by the greater of book value or
Fair Market Value), do not represent more than 15% of Consolidated Net Tangible

                                      15
<PAGE>
 
Assets as reflected on the most recent annual or quarterly consolidated balance
sheet, and PROVIDED FURTHER that, at the time of such sale, such Subsidiary
shall not own, directly or indirectly, any shares of stock or Debt of, or any
other continuing investment in, any other Subsidiary (unless all of the shares
of stock and Debt of such other Subsidiary owned, directly or indirectly, by the
Company and all Subsidiaries are simultaneously being sold as permitted by this
paragraph 6C(4)), or any shares of stock or Debt of the Company.

          6C.(5)       MERGER AND SALE OF ASSETS.  Merge or consolidate with
or into any other Person or sell, convey, lease, transfer or otherwise dispose
of all or any part of its assets, EXCEPT that:

                (i)      (a) any Subsidiary may merge with the Company
          (PROVIDED, that the Company shall be the continuing or surviving
          corporation) and (b) any Subsidiary may merge with a Wholly Owned
          Subsidiary (PROVIDED that the Wholly Owned Subsidiary shall be the
          continuing or surviving corporation),

                (ii)     any Subsidiary may sell, lease, transfer or otherwise
          dispose of any of its assets to the Company or to a Wholly Owned
          Subsidiary,

                (iii)    the Company may merge with any other corporation,
          PROVIDED that (a) the Company shall be the continuing or surviving
          corporation, and (b) immediately after giving effect to such merger no
          Event of Default or Default shall exist,

                (iv)     any non Wholly Owned Subsidiary may merge or
          consolidate with any other corporation, PROVIDED, that immediately
          after giving effect to such merger or consolidation (a) the continuing
          or surviving corporation of such merger or consolidation shall
          constitute a Subsidiary, and (b) no Event of Default or Default shall
          exist,

                (v)      the Company or any Subsidiary may sell, lease, transfer
          or otherwise dispose of any of its assets to any Person, PROVIDED,
          that (a) such assets together with (b) all other assets of the Company
          and its Subsidiaries sold, leased, transferred or otherwise disposed
          of during the preceding 12 month period, and (c) the assets of all
          Subsidiaries the stock or Debt of which has been sold or otherwise
          disposed of during the preceding 12-month period pursuant to the first
          proviso of paragraph 6C(4) (in each transaction measured by the
          greater of book value or Fair Market Value), do not represent more
          that 15% of Consolidated Net Tangible Assets as reflected on the most
          recent annual or quarterly consolidated balance sheet,

                                      16
<PAGE>
 
                (vi)     the Company may merge into or consolidate with any
          solvent corporation if (x) the surviving corporation is a corporation
          organized under the laws of any State of the United States of America,
          (y) such corporation shall expressly assume by an agreement
          satisfactory in substance and form to the Required Holder(s) (which
          agreement may require the delivery in connection with such assumption
          of such opinions of counsel as the Required Holder(s) may reasonably
          require), all of the obligations of the Company under this Agreement
          and the Notes, including all covenants herein and therein contained,
          and such successor or acquiring corporation shall succeed to and be
          substituted for the Company with the same effect as if it had been
          named herein as a party hereto (it being agreed that such assumption
          shall, upon the request of the holder of any outstanding Note and at
          the expense of such successor corporation, be evidenced by the
          exchange of such Note for another Note executed by such successor
          corporation, with such changes in phraseology and form as may be
          appropriate but in substance of like terms as the Note surrendered for
          such exchange and of like unpaid principal amount, and that each Note
          executed pursuant to paragraph 11E after such assumption shall be
          executed by and in the name of such successor corporation) and (z)
          after giving effect to such merger or consolidation no Event of
          Default or Default shall exist,

                (vii)    the Company and any Subsidiary may sell or otherwise
          dispose of property (including inventory) in the ordinary course of
          business, and

                (viii)   the Company may sell Pledged Accounts Receivable
          pursuant to the Permitted Securitization Program in an aggregate
          amount not to exceed $75,000,000.

                6C.(6) LEASE RENTALS.  Except for oil, gas and mineral leases
or permits or similar agreements entered into in the ordinary course of
business, and except for leases for transportation equipment, including 
over-the-road trucks and tankers, data processing and other office equipment
used in the ordinary course of business, enter into or permit to remain in
effect, any agreements to rent or lease (as lessee) any real or personal
property for terms (including options to renew or extend any term, whether or
not exercised) of more than three years if after giving effect thereto the
aggregate amount of all sums payable in any fiscal year by the Company and all
Subsidiaries under all such leases would exceed $4,000,000.

                6C.(7) LIMITATION ON CREDIT EXTENSIONS.  Extend credit, make
advances or make loans other than (i) normal and prudent extensions of credit in
the ordinary course of business, which extensions shall not be for longer
periods than those extended by similar businesses operated in a normal and
prudent manner, (ii) loans from Wholly Owned Subsidiaries to the Company, and
loans from Wholly Owned Subsidiaries or the Company to any Subsidiary, in each
case made in the ordinary course of business and, in the case of loans from
Wholly Owned Subsidiaries that have not executed a Guaranty which are made to
the Company or to a Subsidiary that has executed a Guaranty, subordinated to the
principal of, interest on and Yield-Maintenance Amount, if any, with respect to
the Notes, and (iii) loans made by the Company to its employees pursuant to

                                      17
<PAGE>
 
the Stock Option Agreements; PROVIDED that the aggregate amount of all such
loans permitted by this clause (iii) outstanding at any time shall not exceed
$10,000,000.

                6C.(8) CONTRACTS; TAKE-OR-PAY AGREEMENTS.  Enter into any
"take-or-pay" contract or other contract which requires it to pay for oil, gas,
other hydrocarbons or other minerals prior to taking delivery thereof, PROVIDED
that the Company may enter into such contracts so long as the aggregate maximum
direct and contingent liability of the Company under such contracts does not
exceed $500,000 at any one time, and PROVIDED FURTHER that the Company may enter
into contracts with gas producers requiring the Company to make payments if the
Company has not connected the producer's well to the Company's gathering system
within a specified period of time, so long as the maximum direct or contingent
liability of the Company under such contract does not exceed $500,000. The
Company and its Subsidiaries may enter into: (a) Short Hedge Futures to sell
natural gas or liquid hydrocarbons or to offset a Long Hedge Future; and (b)
Long Hedge Futures to purchase natural gas or liquid hydrocarbons or to offset a
Short Hedge Future; PROVIDED, however, that at the time of entering into a Short
Hedge Future, the Company shall own and have available to it sufficient amounts
of natural gas or liquid hydrocarbons, as the case may be, or shall own pursuant
to firm contracts to deliver natural gas or liquid hydrocarbons, as the case may
be, pursuant to such Short Hedge Future; PROVIDED, further, that at the time of
entering into a Long Hedge Future, the Company shall have sufficient agreements
from Counterparties to purchase natural gas or liquid hydrocarbons, as the case
may be, from the Company so that the Company can resell natural gas or liquid
hydrocarbons, as the case may be, delivered pursuant to such Long Hedge Future.

                6C.(9) SALE OR DISCOUNT OF RECEIVABLES.  Sell with recourse,
or discount (other than to the extent of finance and interest charges included
therein) or otherwise sell for less than face value thereof, any of its notes or
accounts receivable EXCEPT (i) notes or accounts receivable the collection of
which is doubtful in accordance with generally accepted accounting principles
and (ii) pursuant to the Permitted Securitization Program; PROVIDED, however,
that the Company and its Subsidiaries may not have more than one Permitted
Securitization Program outstanding at any time.

                6C.(10)     GUARANTIES.  Enter into or be party to:

                (i)      any contract for the purchase of materials, supplies or
          other property or services if such contract (or any related document)
          requires that payment for such materials, supplies or other property
          or services shall be made regardless of whether or not delivery of
          such materials, supplies or other property or services is ever made or
          tendered, or

               (ii)      any contract to rent or lease (as lessee) any real or
          personal property if such contract (or any related document) provides
          that the obligation to make payments thereunder is absolute and
          unconditional under conditions not customarily found in commercial
          leases then in general use or requires that the lessee purchase or
          otherwise acquire securities or obligations of the lessor, or

                                      18
<PAGE>
 
                (iii)    any contract for the sale or use of materials, supplies
          or other property, or the rendering of services, if such contract (or
          any related document) requires that payment for such materials,
          supplies or other property, or the use thereof, or payment for such
          services, shall be subordinated to any indebtedness (of the purchaser
          or user of such materials, supplies or other property or the Person
          entitled to the benefit of such services) owed or to be owed to any
          Person, or

                (iv)     any other contract that is a guaranty, an endorsement
          or another form of contingent liability in respect of the obligations,
          stock or dividends of any Person or that, in economic effect, is
          substantially equivalent to a guaranty (other than the guaranties
          permitted by clause (v) of paragraph 6C(2)); provided, that the
                                                       --------          
          foregoing provisions shall not apply to endorsements of negotiable
          instruments for collection in the ordinary course of business;

PROVIDED, that, notwithstanding the foregoing, any contract of the type
specified in any of the provisions of this paragraph 6C(10) shall be permitted
if the obligations of the Company thereunder constitute Debt of the type
described in clause (iv) of the definition thereof and such Debt were permitted
by the Debt limitations contained in paragraph 6A(3).

                6C.(11)     TRANSACTIONS WITH AFFILIATES.  Directly or
indirectly, purchase, acquire or lease any property from, or sell, transfer or
lease any property to, or otherwise deal with, in the ordinary course of
business or otherwise (i) any Affiliate, (ii) any Person owning, beneficially or
of record, directly or indirectly, either individually or together with all
other Persons to whom such Person is related by blood, adoption or marriage,
stock of the Company (of any class having ordinary voting power for the election
of directors) aggregating 5% or more of such voting power or (iii) any Person
related by blood, adoption or marriage to any Person described or coming within
the provisions of clause (i) or (ii) of this paragraph 6C(11), PROVIDED that the
Company may sell to, or purchase (within the limitations of paragraph 6B) from,
any such Person shares of the Company's stock and except for transactions that
are otherwise permitted by this Agreement and that are in the ordinary course of
the Company's or a Subsidiary's business, and are also upon fair and reasonable
terms no less favorable to the Company or such Subsidiary than it would obtain
in a comparable arm's-length transaction with a Person not an Affiliate.

                6C.(12)     PANHANDLE JOINT VENTURE DEBT.  Permit the
Panhandle Joint Venture to create, incur, assume or suffer to exist any Debt.

          6D. ISSUANCE OF STOCK BY SUBSIDIARIES.  The Company covenants
that it will not permit any Subsidiary to issue, sell or dispose of any shares
of its stock of any class except to the Company or a Wholly Owned Subsidiary,
and except to the extent that holders of minority interests may be entitled to
purchase stock by reason of preemptive rights.

                                      19
<PAGE>
 
          6E.  OTHER AGREEMENTS.  Without the prior written consent of the
Required Holder(s), the Company will not amend, modify or waive (i) any
provision of the Term Loan Agreement which would shorten the maturity or average
life of any loan thereunder, (ii) any provision of the Revolving Loan Agreement
which would shorten any commitment thereunder, or (iii) any provision of the
Master Shelf Agreement or the 1993 Note Purchase Agreement which would shorten
the maturity or average life of any note issued thereunder.

PARAGRAPH 7.    EVENTS OF DEFAULT.

          7A. ACCELERATION.  If any of the following events shall occur for
any reason whatsoever and be continuing (and whether such occurrence shall be
voluntary or involuntary or come about or be effected by operation of law or
otherwise):

                (i)      the Company defaults in the payment of any principal of
          or Yield Maintenance Amount payable with respect to any Note when the
          same shall become due, either by the terms thereof or otherwise as
          herein provided; or

                (ii)     the Company defaults in the payment of any interest on
          any Note for more than 10 Business Days after the date due; or

                (iii)    the Company or any Subsidiary defaults (whether as
          primary obligor or as guarantor or other surety) in any payment of
          principal of or interest on any other Debt beyond any period of grace
          provided with respect thereto, or the Company or any Subsidiary fails
          to perform or observe any other agreement, term or condition contained
          in any agreement under which any such obligation is created (or if any
          other event thereunder or under any such agreement shall occur and be
          continuing) and the effect of such failure or other event is to cause,
          or to permit the holder or holders of such obligation (or a trustee on
          behalf of such holder or holders) to cause, such obligation to become
          due (or to be repurchased by the Company or any Subsidiary) prior to
          any stated maturity, PROVIDED that the aggregate amount of all
          obligations as to which such a payment default shall occur and be
          continuing or such a failure or other event causing or permitting
          acceleration (or resale to the Company or any Subsidiary) shall occur
          and be continuing exceeds $10,000,000; or

                (iv)     any representation or warranty made by the Company
          herein, by any Guarantor in a Guaranty or by the Company, any
          Guarantor or any of their respective officers in any writing furnished
          in connection with or pursuant to this Agreement shall be false in any
          material respect on the date as of which made; or

               (v)  the Company fails to perform or observe any term, covenant
          or agreement contained in paragraph 6; or

                                      20
<PAGE>
 
                (vi)     the Company fails to perform or observe any other
          agreement, covenant, term or condition contained herein and such
          failure shall not be remedied within 30 days after the Chief Executive
          Officer, President, Chief Financial Officer, Vice President-Finance,
          Treasurer or the Executive Vice President-General Counsel of the
          Company obtains actual knowledge thereof; or

               (vii)     the Company or any Subsidiary makes an assignment for
          the benefit of creditors or is generally not paying its debts as such
          debts become due; or

               (viii)    any decree or order for relief in respect of the
          Company or any Subsidiary is entered under any bankruptcy,
          reorganization, compromise, arrangement, insolvency, readjustment of
          debt, dissolution or liquidation or similar law, whether now or
          hereafter in effect (herein called the "BANKRUPTCY LAW"), of any
          jurisdiction; or

               (ix)      the Company or any Subsidiary petitions or applies to
          any tribunal for, or consents to, the appointment of, or taking
          possession by, a trustee, receiver, custodian, liquidator or similar
          official of the Company or any Subsidiary, or of any substantial part
          of the assets of the Company or any Subsidiary, or commences a
          voluntary case under the Bankruptcy Law of the United States of
          America or any proceedings (other than proceedings for the voluntary
          liquidation and dissolution of a Subsidiary) relating to the Company
          or any Subsidiary under the Bankruptcy Law of any other jurisdiction;
          or

                (x)      any such petition or application is filed, or any such
          proceedings are commenced, against the Company or any Subsidiary and
          the Company or such Subsidiary by any act indicates its approval
          thereof, consent thereto or acquiescence therein, or an order,
          judgment or decree is entered appointing any such trustee, receiver,
          custodian, liquidator or similar official, or approving the petition
          in any such proceedings, and such order, judgment or decree remains
          unstayed and in effect for more than 30 days; or

                (xi)     any order, judgment or decree is entered in any
          proceedings against the Company decreeing the dissolution of the
          Company and such order, judgment or decree remains unstayed and in
          effect for more than 60 days; or

                (xii)    any order, judgment or decree is entered in any
          proceedings against the Company or any Subsidiary decreeing a split-up
          of the Company or such Subsidiary which requires the divestiture of
          assets representing a substantial part, or the divestiture of the
          stock of a Subsidiary whose assets represent a substantial part, of
          the consolidated assets of the Company and its Subsidiaries
          (determined in accordance with generally accepted accounting
          principles) or which requires the divestiture of assets, or stock of a
          Subsidiary, which shall have contributed a

                                      21
<PAGE>
 
          substantial part of the Consolidated Net Earnings of the Company and
          its Subsidiaries (determined in accordance with generally accepted
          accounting principles) for any of the three fiscal years then most
          recently ended, and such order, judgment or decree remains unstayed
          and in effect for more than 60 days; or

                (xiii)   any judgment or order, or series of judgments or
          orders, for the payment of money in an amount in excess of $5,000,000
          is rendered against the Company or any Subsidiary and either (i)
          enforcement proceedings have been commenced by any creditor upon such
          judgment or order or (ii) within 30 days after entry thereof, such
          judgment is not discharged or execution thereof stayed pending appeal,
          or within 30 days after the expiration of any such stay, such judgment
          is not discharged; or

                (xiv)    (a) the Company or any other Person who is a member of
          the Company's "control group" (as such term is defined under ERISA)
          fails to make all or any portion of a required installment payment
          under 29 U.S.C. (S)1082(e) with respect to any Plan, (b) the aggregate
          unpaid balance of such installment together with the unpaid balance of
          all prior installments and other payments due under 29 U.S.C. (S)1082
          (including any accrued interest on such amounts) exceeds $1,000,000,
          and (c) such amounts remain unpaid for more than 30 days after the due
          date of the installment referred to in clause (a); or

                (xv)     the Company or any of its Affiliates as employer under
          a Multiemployer Plan shall have made a complete or partial withdrawal
          from such Multiemployer Plan and the plan sponsor of such
          Multiemployer Plan shall have notified such withdrawing employer that
          such employer has incurred a withdrawal liability in an annual amount
          exceeding $1,000,000; or

                (xvi)    the Company or any Affiliate breaches or defaults in
          the performance of any agreement or instrument creating or evidencing
          any Permitted Securitization Program or breaches or defaults in the
          performance of any prefunding facility associated therewith, and any
          such breach or default continues beyond any applicable period of grace
          provided therefor, or any early or accelerated amortization of any
          obligations or rights commences to occur under any such facility
          without a replacement facility (on terms consistent with those set
          forth in paragraph 6C(9)) being effective to provide for replacement
          funding therefor;

then (a) if such event is an Event of Default specified in clause (viii), (ix)
     ---                                                                      
or (x) of this paragraph 7A with respect to the Company, all of the Notes at the
time outstanding shall automatically become immediately due and payable together
with interest accrued thereon and, to the extent permitted by applicable law,
the Yield-Maintenance Amount, if any, with respect to each such Note, without
presentment, demand, protest or notice of any kind (including, without
limitation, notice of intent to accelerate and notice of acceleration of
maturity), all of which are hereby waived by the Company,

                                      22
<PAGE>
 
(b) if such event is an Event of Default specified in clause (i) or (ii) of this
- ---                                                                             
paragraph 7A, the holder of any Note (other than the Company or any of its
Subsidiaries or Affiliates) as to which such an Event of Default shall have
occurred may at its option during the continuance of such Event of Default, by
notice in writing to the Company, declare such Note to be, and such Note shall
thereupon be and become, immediately due and payable together with interest
accrued thereon and together with, to the extent permitted by applicable law,
the Yield-Maintenance Amount, if any, with respect to each such Note, without
presentment, demand, protest or notice of any kind (including, without
limitation, notice of intent to accelerate), all of which are hereby waived by
the Company, (c) if such event is any other Event of Default, the Required
             ---                                                          
Holder(s) may at its or their option during the continuance of such Event of
Default, by notice in writing to the Company, declare all of the Notes to be,
and all of the Notes shall thereupon be and become, immediately due and payable
together with interest accrued thereon and together with, to the extent
permitted by applicable law, the Yield-Maintenance Amount, if any, with respect
to each Note, without presentment, demand, protest or notice of any kind
(including, without limitation, notice of intent to accelerate), all of which
are hereby waived by the Company, and (d) if any Note shall have been declared
                                      ---                                     
to be due and payable pursuant to clause (b) above, any holder of any other Note
may at any time thereafter, so long as the Event of Default described in clause
(b) above shall at such time be continuing, by notice in writing to the Company,
declare all of the Notes held by such holder to be, and all of the Notes held by
such holder shall thereupon be and become, immediately due and payable together
with interest accrued thereon and together with, to the extent permitted by
applicable law, the Yield-Maintenance Amount, if any, with respect to each such
Note, without presentment, demand, protest or notice of any kind (including,
without limitation, notice of intent to accelerate), all of which are hereby
waived by the Company.  The Company acknowledges and the parties hereto agree,
that the holder of each Note has the right to maintain its investment in the
Notes free from repayment by the Company (except as herein specifically provided
for) and the provisions for payment of the Yield-Maintenance Amount by the
Company in the event that the Notes are prepaid or are accelerated as a result
of an Event of Default, are intended to provide compensation for the deprivation
of such right under such circumstances.

          7B. RESCISSION OF ACCELERATION.  At any time after any or all of the
Notes are declared immediately due and payable and have not been paid in full,
the Required Holder(s) may, by notice in writing to the Company, rescind and
annul such declaration and its consequences if (i) the Company has paid all
overdue interest on the Notes, the principal of and Yield-Maintenance Amount, if
any, payable with respect to any Notes which have become due otherwise than by
reason of such declaration, and interest on such overdue interest and overdue
principal and Yield-Maintenance Amount at the rate specified in the Notes, (ii)
all Events of Default and Defaults, other than non-payment of amounts which have
become due solely by reason of such declaration have been cured or waived
pursuant to paragraph 11C, and (iii) no judgment or decree has been entered for
the payment of any monies due pursuant to the Notes or this Agreement. No such
rescission or annulment shall extend to or affect any subsequent Event of
Default or Default or impair any right arising therefrom.

                                      23
<PAGE>
 
          7C.  NOTICE OF ACCELERATION OR RESCISSION.  Whenever any Note shall
be declared immediately due and payable pursuant to paragraph 7A or any such
declaration shall be rescinded and annulled pursuant to paragraph 7B, the
Company shall forthwith give written notice thereof to the holder of each Note
at the time outstanding.

          7D.  OTHER REMEDIES.  If any Event of Default or Default shall occur
and be continuing, the holder of any Note may proceed to protect and enforce its
rights under this Agreement and such Note by exercising such remedies as are
available to such holder in respect thereof under applicable law, either by suit
in equity or by action at law, or both, whether for specific performance of any
covenant or other agreement contained in this Agreement or in aid of the
exercise of any power granted in this Agreement. No remedy conferred in this
Agreement upon the holder of any Note is intended to be exclusive of any other
remedy, and each and every such remedy shall be cumulative and shall be in
addition to every other remedy conferred herein or now or hereafter existing at
law or in equity or by statute or otherwise.

PARAGRAPH 8.    REPRESENTATIONS, COVENANTS AND WARRANTIES.

          8.    REPRESENTATIONS, COVENANTS AND WARRANTIES.  The Company
represents, covenants and warrants as of the date hereof as follows:

          8A. ORGANIZATION.  The Company is a corporation duly organized and
existing in good standing under the laws of the State of Delaware, each
Subsidiary is duly organized and existing in good standing under the laws of the
jurisdiction in which it is incorporated, and the Company has and each
Subsidiary has the corporate power to own its respective property and to carry
on its respective business as now being conducted. The execution, delivery and
performance by the Company of this Agreement and the Notes are within the
Company's corporate powers and have been duly authorized by all necessary
corporate action, and the execution, delivery and performance by each Guarantor
of its respective Guaranty are within such Guarantor's corporate powers and have
been duly authorized by all necessary corporate action. SCHEDULE 8A attached
hereto sets forth the name and jurisdiction of incorporation of each Subsidiary
and the percentage of the Company's ownership interest in each such Subsidiary
and identifies each Subsidiary that is a Guarantor, all as of the Date of
Closing.

          8B. FINANCIAL STATEMENTS.  The Company has furnished each Purchaser
with the following financial statements, identified by a principal financial
officer of the Company: (i) a consolidated balance sheet of the Company and its
Subsidiaries as at December 31 in each of the four fiscal years of the Company
most recently completed and consolidated statements of operations and cash flows
of the Company and its Subsidiaries for each of the five fiscal years of the
Company most recently completed, all certified by Price Waterhouse L.L.P.; and
(ii) consolidated balance sheets of the Company and its Subsidiaries as at the
end of the quarterly period ended September 30, 1995 and the comparable
quarterly period in the preceding fiscal year and consolidated statements of
operations and cash flows for the periods from the beginning of the fiscal years
in which such quarterly periods are included to the end of such quarterly
periods, prepared by the Company. Such financial

                                      24
<PAGE>
 
statements (including any related schedules and/or notes) are true and correct
in all material respects (subject, as to interim statements, to changes
resulting from audits and year-end adjustments), have been prepared in
accordance with generally accepted accounting principles consistently followed
(except as set forth in the notes thereto if consistent with generally accepted
accounting principles and generally accepted auditing standards) throughout the
periods involved and show all liabilities, direct and contingent, of the Company
and its Subsidiaries required to be shown in accordance with such principles.
The balance sheets fairly present the consolidated financial condition of the
Company and its Subsidiaries as at the dates thereof, and the statements of
operations and cash flows fairly present the results of the consolidated
operations of the Company and its Subsidiaries for the periods indicated.  There
has been no material adverse change in the business, property or assets,
financial condition or results of operations (financial or otherwise) of the
Company and its Subsidiaries taken as a whole since December 31, 1994.

          8C. ACTIONS PENDING.  There is no action, suit, investigation or
proceeding pending or, to the knowledge of the Company, threatened against the
Company, any of its Subsidiaries, any of its Affiliates that is controlled by
the Company or any joint venture in which the Company or any of its Subsidiaries
has an investment, or any properties or rights of the Company, any of its
Subsidiaries, any of its Affiliates that is controlled by the Company or any
joint venture in which the Company or any of its Subsidiaries has an investment,
by or before any court, arbitrator or administrative or governmental body which
is reasonably likely to result in any material adverse change in the business,
property or assets, financial condition or results of operations of the Company
and its Subsidiaries taken as a whole. There is no action, suit, investigation
or proceeding pending or threatened against the Company or any of its
Subsidiaries, any of its Affiliates that is controlled by the Company or any
joint venture in which the Company or any of its Subsidiaries has an investment
which purports to affect the validity or enforceability of this Agreement, any
Note or any Guaranty.

          8D. OUTSTANDING DEBT.  Neither the Company nor any of its
Subsidiaries has outstanding any Debt except as permitted by paragraph 6C(2).
There exists no default (and no waiver of any default that is conditional or is
limited in duration) under the provisions of any instrument evidencing such
Debt, or any Debt of any joint venture in which the Company or any Subsidiary
has an investment, or of any agreement relating thereto.

          8E. ENVIRONMENTAL COMPLIANCE.  The Company, each of its
Subsidiaries, each of its Affiliates that is controlled by the Company and each
joint venture in which the Company or any of its Subsidiaries has an investment
and all of their respective properties and facilities have complied at all times
and in all respects with all federal, state, local and regional statutes, laws,
ordinances and judicial and administrative orders, judgments, rulings and
regulations relating to protection of the environment except, in any such case,
where failure to comply would not result in a material adverse effect on the
business, property or assets, financial condition or results of operations
(financial or otherwise) or operations of the Company and its Subsidiaries taken
as a whole.

                                      25
<PAGE>
 
          8F. TAXES.  The Company has and each of its Subsidiaries has filed
all Federal, State and other income tax returns which, to the best knowledge of
the officers of the Company and its Subsidiaries, are required to be filed, and
each has paid all taxes as shown on such returns and on all assessments received
by it to the extent that such taxes have become due, except such taxes as are
being contested in good faith by appropriate proceedings and for which adequate
reserves have been established in accordance with generally accepted accounting
principles.  The Federal income tax liabilities of the Company and its
Subsidiaries have been determined by the Internal Revenue Service (or the
applicable statute of limitations has run) and such liabilities have been paid
for all fiscal years up to and including the fiscal year ended December 31,
1989.

          8G. CONFLICTING AGREEMENTS AND OTHER MATTERS.  Neither the
Company nor any of its Subsidiaries is a party to any contract or agreement or
subject to any charter or other corporate restriction which materially and
adversely affects its business, property or assets, or financial condition.
Neither the execution nor delivery of this Agreement, the Notes or the
Guaranties, nor the offering, issuance and sale of the Notes, nor fulfillment of
nor compliance with the terms and provisions hereof and of the Notes will
conflict with, or result in a breach of the terms, conditions or provisions of,
or constitute a default under, or result in any violation of, or result in the
creation of any Lien upon any of the properties or assets of the Company or any
of its Subsidiaries pursuant to, the charter or by-laws of the Company or any of
its Subsidiaries, any award of any arbitrator or any agreement (including any
agreement with stockholders), instrument, order, judgment, decree, statute, law,
rule or regulation to which the Company or any of its Subsidiaries is subject.
Neither the Company nor any of its Subsidiaries is a party to, or otherwise
subject to any provision contained in, any instrument evidencing indebtedness of
the Company or such Subsidiary, any agreement relating thereto or any other
contract or agreement (including its charter) which limits the amount of, or
otherwise imposes restrictions on the incurring of, Debt of the Company of the
type to be evidenced by the Notes or the Guaranties except as set forth in the
agreements listed in EXHIBIT C attached hereto.

          8H. OFFERING OF NOTES.  Neither the Company nor any agent acting on
its behalf has, directly or indirectly, offered the Notes or any similar
security of the Company for sale to, or solicited any offers to buy the Notes or
any similar security of the Company from, or otherwise approached or negotiated
with respect thereto with, any Person other than the Purchasers and not more
than 80 other institutional investors, and neither the Company nor any agent
acting on its behalf has taken or will take any action which would subject the
issuance or sale of the Notes to the provisions of Section 5 of the Securities
Act or to the registration, prospectus delivery or similar provisions of any
securities or Blue Sky law of any applicable jurisdiction.

          8I. REGULATION G, ETC.  The proceeds of the sale of the Notes will
be used to refinance existing indebtedness under the Revolving Loan Agreement.
None of the proceeds of the sale of any Notes will be used, directly or
indirectly, for the purpose, whether immediate, incidental or ultimate, of
purchasing or carrying any "margin stock" as defined in Regulation G (12 C.F.R.
Part 207) of the Board of Governors of the Federal Reserve System (herein called
"margin stock") or for the purpose of maintaining, reducing or retiring any
indebtedness which was originally incurred to

                                      26
<PAGE>
 
purchase or carry any stock that is then currently a margin stock or for any
other purpose which might constitute the purchase of such Notes a "purpose
credit" within the meaning of such Regulation G.  After applying the proceeds of
the sale of the Notes, not more than 25% of the value of the assets subject to
the terms of paragraph 5C, 6C(l), 6C(4) or 6C(5) will be "margin stock." Neither
the Company nor any agent acting on its behalf has taken or will take any action
which might cause this Agreement or the Notes to violate Regulation G,
Regulation T, Regulation X or any other regulation of the Board of Governors of
the Federal Reserve System or to violate the Exchange Act, in each case as in
effect now or as the same may hereafter be in effect.

          8J. ERISA.  No accumulated funding deficiency (as defined in section
302 of ERISA and section 412 of the Code), whether or not waived, exists with
respect to any Plan (other than a Multiemployer Plan). No liability to the PBGC
has been or is expected by the Company to be incurred with respect to any Plan
(other than a Multiemployer Plan) by the Company or any of its Subsidiaries
which is or would be materially adverse to the business, property or assets,
financial condition or results of operations of the Company and its Subsidiaries
taken as a whole. Neither the Company nor any of its Subsidiaries has incurred
or presently expects to incur any withdrawal liability under Title IV of ERISA
with respect to any Multiemployer Plan which is or would be materially adverse
to the business, property or assets, financial condition or results of
operations of the Company and its Subsidiaries taken as a whole. No Plan
providing welfare benefits to retired former employees of the Company or any of
its Subsidiaries has been established or is maintained for which the present
value of future benefits payable, in excess of irrevocably designated funds for
such purpose, is materially adverse to the business, property or assets,
financial condition or results of operations of the Company and its Subsidiaries
taken as a whole. The purchase of Notes by the Purchasers will not constitute a
"prohibited transaction" (as such term is defined in section 406 of ERISA or
section 4975 of the Code). The representation by the Company in the next
preceding sentence is made in reliance upon and subject to the accuracy of the
representations of the Purchasers in paragraph 9B. Neither the Company or any
ERISA Affiliate, nor any "employee benefit plan" (as such term is defined in
section 3 of ERISA) of the Company or any ERISA Affiliate or any trust created
thereunder or any trustee or administrator thereof, has engaged in any
"prohibited transaction" that could subject any such Person, or any other party
dealing with such employee benefit plan or trust, to such penalty or tax.

          8K. GOVERNMENTAL CONSENT.  Neither the nature of the Company or of
any Subsidiary, nor any of their respective businesses or properties, nor any
relationship between the Company or any Subsidiary and any other Person, nor any
circumstance in connection with the offering, issuance, sale or delivery of the
Notes is such as to require any authorization, consent, approval, exemption or
other action by or notice to or filing with any court or administrative or
governmental or regulatory body (other than routine filings after the Date of
Closing with the Securities and Exchange Commission and/or state Blue Sky
authorities) in connection with the execution and delivery of this Agreement or
any Guaranty, the offering, issuance, sale or delivery of the Notes or
fulfillment of or compliance with the terms and provisions hereof, of any
Guaranty or of the Notes.

                                      27
<PAGE>
 
          8L. TITLE TO PROPERTIES.  The Company has and each of its
Subsidiaries has good and defensible title to its respective real properties
(other than properties which it leases) and good title to all of its other
respective properties and assets, including the properties and assets reflected
in the most recent audited balance sheet referred to in paragraph 8B (other than
properties and assets disposed of in the ordinary course of business), subject
to no Lien of any kind except Liens permitted by paragraph 6C(1) except that (i)
with respect to easements and rights of way associated with the Company's gas
gathering systems: (a) the Company has such title as is customary and
appropriate in accordance with applicable industry standards and (b) the costs
of curing defects in such title, if any, would not exceed $10,000,000 in the
aggregate, (ii) no representation or warranty is made with respect to any gas or
mineral property or interest to which no proved oil or gas reserves are properly
attributed and (iii) with respect to Western Gas Resources Storage, Inc.'s Katy
Hub and Gas Storage Facility:  (a) the condemnation process relating to certain
storage rights, rights-of-way and well easements has not been completed and
therefore, as of the Closing Date, Western Gas Resources Storage, Inc. has, with
respect to such storage rights, rights-of-way and well easements, only the right
to the possession thereof (such right to possession being sufficient to enable
Western Gas Resources Storage, Inc. to conduct its business and operations at
the Katy Hub and Gas Storage Facility as currently conducted and as proposed to
be conducted) and (b) when such condemnation process is completed and Western
Gas Storage, Inc. has paid all amounts determined to be due to the condemnee
with respect thereto, Western Gas Storage, Inc. will obtain good and defensible
title to said storage rights, rights-of-way and well easements.  All leases
necessary in any material respect for the conduct of the respective businesses
of the Company and its Subsidiaries are valid and subsisting and are in full
force and effect.

          8M. DISCLOSURE.  Neither this Agreement nor the Private Placement
Memorandum nor any other document, certificate or statement furnished to the
Purchasers by or on behalf of the Company or any Guarantor in connection
herewith contains any untrue statement of a material fact or omits to state a
material fact necessary in order to make the statements contained herein and
therein not misleading. There is no fact peculiar to the Company or any of its
Subsidiaries which materially adversely affects or in the future is reasonably
likely (so far as the Company can now foresee) to materially adversely affect
the business, property or assets, financial condition or results of operations
of the Company and its Subsidiaries taken as a whole and which has not been set
forth in this Agreement or in the Private Placement Memorandum. The financial
projections provided to the Purchasers prior to the Date of Closing are
reasonable based on the assumptions stated therein and the best information
available to the officers of the Company.

          8N. DELIVERY OF OTHER AGREEMENTS.  The Company has delivered to
each Purchaser prior to the date hereof a true, correct and complete copy of
each of the NationsBank Agreement, the Master Shelf Agreement, the 1993 Note
Purchase Agreement and the Receivables Purchase Agreement,  including all
amendments and waivers of any provision thereof.

          8O. PUBLIC UTILITY HOLDING COMPANY ACT; FEDERAL POWER ACT.
Neither the Company nor any Subsidiary is a "holding company" or a "subsidiary
company" of a "holding company" or a "public utility company" as such terms are
defined in the Public Utility Holding

                                      28
<PAGE>
 
Company Act of 1935, as amended, or, except for Western Gas Resources Power
Marketing, Inc., a "public utility" as such term is defined in the Federal Power
Act, as amended.

          8P. INVESTMENT COMPANY ACT.  Neither the Company nor any Subsidiary
is, or is directly or indirectly controlled by, or acting on behalf of any
Person that is, an "investment company" within the meaning of the Investment
Company Act of 1940, as amended.

          8Q. RANK OF NOTES.  The Notes rank at least pari passu in right of
payment with all other senior unsecured Debt of the Company, including without
limitation the Debt with respect to the NationsBank Agreement, the Master Shelf
Agreement and the 1993 Note Purchase Agreement.

PARAGRAPH 9.    REPRESENTATIONS OF THE PURCHASERS.

          9.    REPRESENTATIONS OF THE PURCHASERS.  Each Purchaser severally
represents to the Company as of the date hereof as follows:

          9A. NATURE OF PURCHASE.  Such Purchaser is not acquiring the
Notes to be purchased by it hereunder with a view to or for sale in connection
with any distribution thereof within the meaning of the Securities Act, provided
that the disposition of the property of such Purchaser shall at all times be and
remain within its control.

          9B. SOURCE OF FUNDS. Such Purchaser represents that at least one of
the following statements concerning each source of funds to be used by it to
purchase any Notes (respectively, the "SOURCE") is accurate as of the Date of
Closing with respect to such Notes:

                (i)      The Source is not an "employee benefit plan" as defined
          in Title 1, Section 3(3) of ERISA;

                (ii)     the Source is a "governmental plan" as defined in Title
          I, Section 3(32) of ERISA;

                (iii)    the Source is the general account of such Purchaser,
          and all requirements for an exemption under PTE 95-60 (issued July 12,
          1995) have been satisfied; provided, that in making such
          representation such Purchaser is relying on the Company's
          representations set forth in paragraph 8J;

                (iv)     the Source is either (a) an insurance company pooled
          separate account, and the purchase is exempt in accordance with PTE 
          90-1 (issued January 29, 1990), or (b) an insurance company
          "guaranteed contract separate account" entitled to the exemption
          granted by PTE 81-82 (issued September 18, 1981) and described in
          Department of Labor Advisory Opinion F2584A (issued September 21,
          1983);

                                      29
<PAGE>
 
                (v)      the Source is an "investment fund" managed by a
          "qualified professional asset manager" or "QPAM" (as defined in Part V
          of PTE 84-14, issued March 13, 1984), and the purchase is exempt under
          PTE 84-14; provided that no other party to the transactions described
          in this Agreement and no "affiliate" of such other party (as defined
          in Section V(c) of PTE 84-14) has at this time, and during the
          immediately preceding one year, exercised the authority to appoint or
          terminate said QPAM as manager of the assets of any plan identified to
          the Company in writing pursuant to this clause (v) or to negotiate the
          terms of said QPAM's management agreement on behalf of any such
          identified plans; or

                (vi)     the Source is a plan or a separate account comprised of
          plans identified in writing by such Purchaser to the Company pursuant
          to this clause (vi).

PARAGRAPH 10.   DEFINITIONS.

          10.   DEFINITIONS.  For the purpose of this Agreement, the terms
defined in the introductory sentence and in paragraphs 1 and 2 shall have the
respective meanings specified therein, and the following terms shall have the
meanings specified with respect thereto below (such meanings to be equally
applicable to both the singular and plural forms of the terms defined):

          10A.YIELD-MAINTENANCE TERMS.

          "CALLED PRINCIPAL" shall mean, with respect to any Note, the principal
of such Note that is to be prepaid pursuant to paragraph 4A or is declared to be
immediately due and payable pursuant to paragraph 7A, as the context requires.

          "DISCOUNTED VALUE" shall mean, with respect to the Called Principal of
any Note, the amount obtained by discounting all Remaining Scheduled Payments
with respect to such Called Principal from their respective scheduled due dates
to the Settlement Date with respect to such Called Principal, in accordance with
accepted financial practice and at a discount factor (applied on a quarterly
basis) equal to the Reinvestment Yield with respect to such Called Principal.

          "REINVESTMENT YIELD" shall mean, with respect to the Called Principal
of any Note, the yield to maturity implied by (a) the yields reported, as of
                                              ---                           
10:00 A.M. (New York City local time) on the Business Day next preceding the
Settlement Date with respect to such Called Principal, on the display designated
as "Page 500" on the Telerate Service (or such other display as may replace page
500 on the Telerate Service) for actively traded U.S. Treasury securities having
a maturity equal to the Remaining Average Life of such Called Principal as of
such Settlement Date, plus 0.50%, or if such yields shall not be reported as of
such time or the yields reported as of such time shall not be ascertainable, (b)
                                                                             ---
the Treasury Constant Maturity Series yields reported, for the latest day for
which such yields shall have been so reported as of the Business Day next
preceding the Settlement Date with respect to such Called Principal, in Federal
Reserve Statistical Release H.15 (519) (or any comparable successor publication)
for actively traded U.S. Treasury securities having a constant

                                      30
<PAGE>
 
maturity equal to the Remaining Average Life of such Called Principal as of such
Settlement Date, plus 0.50%.  All implied yields under either clause (a) or (b)
of this definition shall be determined, (i) if necessary, by (x) converting U.S.
                                                             ---                
Treasury bill quotations to bond-equivalent yields in accordance with accepted
financial practice and (y) interpolating linearly between yields reported for
                       ---                                                   
various maturities, and (ii) by converting all such implied yields to a
quarterly payment basis in accordance with accepted financial practice.

          "REMAINING AVERAGE LIFE" shall mean, with respect to the Called
Principal of any Note, the number of years (calculated to the nearest one-
twelfth year) obtained by dividing (i) such Called Principal into (ii) the sum
                                   ---                            ----        
of the products obtained by multiplying (a) each Remaining Scheduled Payment of
                                        ---                                    
such Called Principal (but not of interest thereon) by (b) the number of years
                                                       ---                    
(calculated to the nearest one-twelfth year) which will elapse between the
Settlement Date with respect to such Called Principal and the scheduled due date
of such Remaining Scheduled Payment.

          "REMAINING SCHEDULED PAYMENTS" shall mean, with respect to the Called
Principal of any Note, all payments of such Called Principal and interest that
would accrue thereon on or after the Settlement Date with respect to such Called
Principal if no payment of such Called Principal were made prior to its
scheduled due date.

          "SETTLEMENT DATE" shall mean, with respect to the Called Principal of
any Note, the date on which such Called Principal is to be prepaid pursuant to
paragraph 4A or is declared to be immediately due and payable pursuant to
paragraph 7A, as the context requires.

          "YIELD-MAINTENANCE AMOUNT" shall mean, with respect to any Note, an
amount equal to the excess, if any, of the Discounted Value of the Called
Principal of such Note over such Called Principal.  The Yield-Maintenance Amount
shall in no event be less than zero.

          10B. OTHER TERMS.

          "ADJUSTED CONSOLIDATED DEBT" shall mean Consolidated Debt (excluding
Debt in the amount of the Receivables Investment relating to the Permitted
Securitization Program) PLUS Excess Working Capital Deficit.

          "AFFILIATE" shall mean any Person directly or indirectly controlling,
controlled by, or under direct or indirect common control with, the Company,
except a Subsidiary.  A Person shall be deemed to control a corporation if such
Person possesses, directly or indirectly, the power to direct or cause the
direction of the management and policies of such corporation, whether through
the ownership of voting securities, by contract or otherwise.

          "AUTHORIZED OFFICER" shall mean, in the case of the Company, its Chief
Executive Officer, its Chief Financial Officer, its Treasurer, its President or
the Executive Vice President-General Counsel or the Vice President-Finance of
the Company.  Any action taken under this Agreement on behalf of the Company by
any individual who on or after the date of this Agreement

                                      31
<PAGE>
 
shall have been an Authorized Officer of the Company and whom any holder of a
Note in good faith believes to be an Authorized Officer of the Company at the
time of such action shall be binding on the Company even though such individual
shall have ceased to be an Authorized Officer of the Company.

          "BANKRUPTCY LAW" shall have the meaning specified in clause (viii) of
paragraph 7A.

          "BUSINESS DAY" shall mean any day other than a Saturday, a Sunday or a
day on which commercial banks in New York City are required or authorized to be
closed.

          "CAPITALIZED LEASE OBLIGATION" shall mean any rental obligation which,
under generally accepted accounting principles, is or will be required to be,
capitalized on the books of the Company or any Subsidiary, taken at the amount
thereof accounted for as indebtedness (net of interest expenses) in accordance
with such principles.

          "CLOSING" shall have the meaning specified in paragraph 2.

          "CODE" shall mean the Internal Revenue Code of 1986, as amended.

          "CONFIDENTIAL INFORMATION" shall mean any material non-public
information regarding the Company and its Subsidiaries that is provided to any
holder of any Note, any Person who purchases a participation in a Note and any
offeree of a Note or participation therein pursuant to this Agreement other than
information (i) which was publicly known or otherwise known to such holder, such
Person or such offeree at the time of disclosure, (ii) which subsequently
becomes publicly known through no act or omission of such holder, such Person or
such offeree or (iii) which otherwise becomes known to such holder, such Person
or such offeree, other than through disclosure by the Company or any Subsidiary.

          "CONSOLIDATED CURRENT ASSETS" shall mean the consolidated current
assets of the Company and its Subsidiaries, as determined in accordance with
generally accepted accounting principles.

          "CONSOLIDATED CURRENT LIABILITIES" shall mean the consolidated current
liabilities (including, without limitation, the Debt in respect of the Permitted
Securitization Program) of the Company and its Subsidiaries, as determined in
accordance with generally accepted accounting principles.

          "CONSOLIDATED DEBT" shall mean the consolidated Debt of the Company
and its Subsidiaries, determined in accordance with generally accepted
accounting principles.

                                      32
<PAGE>
 
          "CONSOLIDATED NET EARNINGS" shall mean consolidated gross revenues of
the Company and its Subsidiaries including any gains (net of expenses and taxes
applicable thereto) resulting from the sale, conversion or other disposition of
capital assets (i.e., assets other than current assets), LESS all operating and
non-operating expenses of the Company and its Subsidiaries including all losses
resulting from the sale, conversion or other disposition of capital assets (i.e.
assets other than current assets) and all charges of a proper character
(including current and deferred taxes on income, provision for taxes on
unremitted foreign earnings that are included in gross revenues, and current
additions to reserves), but not including in gross revenues any gains resulting
from the write-up of assets, any equity of the Company or any Subsidiary in the
unremitted earnings of any Person that is not a Subsidiary, any earnings of any
Person acquired by the Company or any Subsidiary through purchase, merger or
consolidation or otherwise for any period prior to the time of acquisition, or
any deferred credit representing the excess of equity in any Subsidiary at the
date of acquisition over the cost of the investment in such Subsidiary, all
determined in accordance with generally accepted accounting principles.

          "CONSOLIDATED NET EARNINGS AVAILABLE FOR RESTRICTED PAYMENTS" shall
mean an amount equal to (1) the sum of $50,000,000 PLUS (2) 50% (or minus 100%
in case of a deficit) of Consolidated Net Earnings for the period commencing on
July 1, 1995 and terminating at the end of the last fiscal quarter preceding the
date of any proposed Restricted Payment (taken as one accounting period), LESS
(3) the sum of all Restricted Payments made or declared after June 30, 1995,
plus (4) the aggregate amount received by the Company after June 30, 1995, as
the net cash proceeds of the sale of any shares of its stock.  There shall not
be included in Restricted Payments or in any computation of Consolidated Net
Earnings Available for Restricted Payments (x) dividends paid, or distributions
made, in stock of the Company; or (y) exchanges of stock of one or more classes
of the Company, except to the extent that cash or other value is involved in
such exchange.  The term "stock" as used in this definition and in the
definition of "Restricted Payments" shall include warrants or options to
purchase stock.

          "CONSOLIDATED NET TANGIBLE ASSETS" shall mean the consolidated assets
of the Company and its Subsidiaries, LESS, without duplication, (i) Consolidated
Current Liabilities MINUS  Excess Working Capital Deficit, (ii) asset,
liability, contingency and other reserves of the Company and its Subsidiaries,
including reserves for depreciation and for deferred income taxes, (iii) all
other liabilities of the Company and its Subsidiaries, except liabilities for
Funded Debt of the types described in clauses (i), (ii) and (iii) of the
definition of Debt, and (iv) treasury stock, unamortized debt discount and
expense, goodwill, trademarks, brand names, patents, organizational expenses and
any other intangible assets of the Company and its Subsidiaries, and any write-
up of the value of any assets after June 30, 1991, all as determined in
accordance with generally accepted accounting principles; PROVIDED, HOWEVER,
that the term "Consolidated Net Tangible Assets" shall include the book value of
long-term gas contracts with producers that the Company assumes in connection
with acquisitions and that are reflected on the books of the Company as assets.

                                      33
<PAGE>
 
          "CONSOLIDATED TANGIBLE NET WORTH" shall mean consolidated
stockholders' equity of the Company and its Subsidiaries, less goodwill,
trademarks, brand names, patents, organizational expenses and any other
intangible assets of the Company and its Subsidiaries, all as determined in
accordance with generally accepted accounting principles; PROVIDED, HOWEVER,
that the term "Consolidated Tangible Net Worth" shall include the book value of
long-term gas contracts with producers that the Company assumes in connection
with acquisitions and that are reflected on the books of the Company as assets.

          "COUNTERPARTY" shall mean (i) those Persons listed on SCHEDULE 6C(8)
attached hereto, (ii) any Person that is not an Affiliate of the Company and
that has senior debt securities rated at least A by Standard & Poor's or Moody's
or whose obligations in respect of agreements described in the final proviso to
paragraph 6C(8) or in the definition of Long Hedge Future or Short Hedge Future,
as the case may be, are fully guaranteed by an affiliate of such Person whose
senior debt securities are so rated, and (iii) any other Person that is not an
Affiliate of the Company and with whom the Company has agreements of the nature
described in the final proviso to paragraph 6C(8) or in the definition of Long
Hedge Future or Short Hedge Future, so long as (a) the aggregate amount of all
such agreements with such Person outstanding at any time shall not exceed
$1,000,000, and (b) the Company has such agreements outstanding with no more
than nine other such Persons at any time.

          "DATE OF CLOSING" shall have the meaning specified in paragraph 2.

          "DEBT" shall mean, without duplication:

                (i)      any obligation that, under generally accepted
          accounting principles, is shown on the balance sheet as a liability
          (including, without limitation, any obligation for borrowed money, any
          notes payable and drafts accepted representing extensions of credit,
          whether or not representing obligations for borrowed money, and
          Capitalized Lease Obligations but excluding accounts payable and
          accrued expenses in the ordinary course of business, reserves for
          deferred income taxes and other reserves to the extent that such
          reserves do not constitute an obligation),

                (ii)     any obligation secured by a Lien on, or payable out of
          the proceeds of production from, property, whether or not the
          obligation secured thereby shall have been assumed by the owner of
          such property,

                (iii)    liabilities in respect of unfunded vested benefits
          under Plans and liabilities in respect of postretirement benefits
          that, under generally accepted accounting principles in effect at the
          time in question, are shown on the balance sheet as a liability, and

                (iv)     any obligation described in paragraph 6C(10) for which
          a maximum amount is quantifiable.

                                      34
<PAGE>
 
          "ERISA" shall mean the Employee Retirement Income Security Act of
1974, as amended.

          "ERISA AFFILIATE" shall mean any corporation or trade or business
that:

                (i)      is a member of the same controlled group of
          corporations (within the meaning of Section 414(b) of the Code) as the
          Company, or

                (ii)     is under common control (within the meaning of Section
          414(c) of the Code) with the Company.

          "EVENT OF DEFAULT" shall mean any of the events specified in paragraph
7A, provided that there has been satisfied any requirement in connection with
such event for the giving of notice, or the lapse of time, or the happening of
any further condition, event or act, and "DEFAULT" shall mean any of such
events, whether or not any such requirement has been satisfied.

          "EXCESS WORKING CAPITAL DEFICIT" shall mean (i) if the Company's
Working Capital is greater than or equal to negative $10,000,000, zero, or (ii)
if the Company's Working Capital is less than negative $10,000,000, the product
of (A) the amount of such Working Capital PLUS $10,000,000 MULTIPLIED BY (B)
negative one (for example, if Working Capital equals negative $15,000,000, the
Excess Working Capital Deficit would equal $5,000,000).  For purposes of this
definition, "WORKING CAPITAL" means the remainder of the Company's Consolidated
Current Assets MINUS the Company's Consolidated Current Liabilities, excluding
current maturities of Funded Debt.

          "EXCHANGE ACT" shall mean the Securities Exchange Act of 1934, as
amended.

          "EXISTING GUARANTY" shall mean each guaranty of a Guarantor in favor
of the banks parties to the NationsBank Agreement or the purchasers parties to
the Master Shelf Agreement or the 1993 Note Purchase Agreement for which a
similar guaranty shall have been issued to each holder of Notes.

          "FAIR MARKET VALUE" shall mean, at any time with respect to any
property of any kind or character, the sale value of such property that would be
realized in an arm's length sale at such time between an informed and willing
buyer and an informed and willing seller, under no compulsion to buy or sell,
respectively.

          "FUNDED DEBT" shall mean any Debt payable more than one year from the
date of creation thereof.

          "GUARANTOR" shall mean each of Western Gas Resources Storage, Inc., a
Texas corporation; Western Gas Resources - Texas, Inc., a Texas corporation;
Western Gas Resources -Oklahoma, Inc., a Delaware corporation; Mountain Gas
Resources, Inc., a Delaware corporation,

                                      35
<PAGE>
 
MGTC, MIGC and each other Subsidiary of the Company that issues a Guaranty to
all of the holders of Notes.

          "GUARANTY" shall mean each guaranty of a Guarantor in substantially
the form of EXHIBIT E hereto.

          "INTERCREDITOR AGREEMENT" shall mean the Intercreditor Agreement
substantially in the form of EXHIBIT F hereto.

          "LIEN" shall mean any mortgage, pledge, priority, security interest,
encumbrance, deposit arrangement, lien (statutory or otherwise) or charge of any
kind (including any agreement to give any of the foregoing, any conditional sale
or other title retention agreement, any lease in the nature thereof, and the
filing of or agreement to give any financing statement under the Uniform
Commercial Code of any jurisdiction) or any other type of preferential
arrangement for the purpose, or having the effect, of protecting a creditor
against loss or securing the payment or performance of an obligation.

          "LONG HEDGE FUTURE" shall mean an agreement, purchased on a
commodities exchange or entered into with a Counterparty, that obligates the
Company to purchase natural gas or liquid hydrocarbons, as the case may be, at a
pre-determined price at a pre-determined time.

          "MGTC" shall mean MGTC, Inc., a Wyoming corporation.

          "MIGC" shall mean MIGC, Inc., a Delaware corporation.

          "MASTER SHELF AGREEMENT" shall mean that certain Amended and Restated
Master Shelf Agreement dated as of December 19, 1991, between the Company and
The Prudential Insurance Company of America, as the provisions thereof have
heretofore been amended or waived or may be from time to time amended or waived
in compliance with paragraph 6E.

          "MOODY'S" shall mean Moody's Investors Service, Inc.

          "MULTIEMPLOYER PLAN" shall mean any plan that is a "multiemployer
plan" (as such term is defined in section 4001(a)(3) of ERISA).

          "NATIONSBANK" shall mean NationsBank of Texas, N.A., and its
successors and assigns.

          "NATIONSBANK AGREEMENT" shall mean, collectively, the Revolving Loan
Agreement and the Term Loan Agreement, as the provisions thereof have been or
may be from time to time amended or waived in compliance with paragraph 6E.

                                      36
<PAGE>
 
          "NATURAL GAS INVENTORY" shall mean at the time in question, the
Company's and its Subsidiaries' inventory of natural gas in storage.

          "1993 NOTE PURCHASE AGREEMENT" shall mean, collectively, those certain
separate Note Purchase Agreements each dated as of April 1, 1993, between the
Company and each of the purchasers listed on Annex 1 thereto, respectively, as
the provisions thereof have heretofore been amended or waived or may be from
time to time amended or waived in compliance with paragraph 6E.

          "NOTES" shall have the meaning specified in paragraph 1.

          "OFFICER'S CERTIFICATE" shall mean a certificate signed in the name of
the Company by an Authorized Officer of the Company.

          "OVER-COLLATERALIZATION AMOUNT" shall have the meaning specified in
the definition of "Permitted Securitization Program."

          "PANHANDLE JOINT VENTURE" shall mean the joint venture formed between
the Company and Panhandle Eastern Pipe Line Company.

          "PBGC" shall mean the Pension Benefit Guaranty Corporation or any
successor entity serving a similar function.

          "PERMITTED SECURITIZATION PROGRAM" shall mean a transaction or series
of transactions executed pursuant to documentation that contemplates a
commitment which is for a period of not more than 364 days and which is not
extendible at the option of the Company or any of its Subsidiaries and pursuant
to which each of the following conditions is satisfied:

                (a)      the Company and the Subsidiaries sell, transfer or
          otherwise dispose of, at not less than face value, on a revolving
          basis, an undivided interest in a pool of the Company's and the
          Subsidiaries' accounts receivable to a special purpose entity (the
          "SPECIAL PURPOSE ENTITY"), in an amount not to exceed, at any time
          $75,000,000 and grants a security interest in connection therewith
          with respect to such accounts receivable which secures an amount not
          greater than 10% of the aforesaid amount sold or transferred at such
          time for the purpose of providing the purchaser with over-
          collateralization (the "OVER-COLLATERALIZATION AMOUNT"); and, as a
          part of such transaction,

                (b)      the Company and the Subsidiaries grant a security
          interest (the "SECURITY INTEREST") in all or a portion of their
          accounts receivable (the "PLEDGED ACCOUNTS RECEIVABLE") to the Special
          Purpose Entity for the purpose of providing the Special Purpose Entity
          with a basis of recourse for its investment (i.e., the

                                      37
<PAGE>
 
          aforesaid amount not to exceed $75,000,000) in the Pledged Accounts
          Receivable (the "RECEIVABLES INVESTMENT"), PROVIDED that:

                    (i)    the maximum recourse to the Pledged Accounts
               Receivable shall be equal to the purchase price of the
               Receivables Investment plus 10%, in an aggregate amount not to
               exceed Eighty-Two Million Five Hundred Thousand Dollars
               ($82,500,000) (the "RECOURSE AMOUNT");

                    (ii)   the Security Interest shall apply to each Pledged
               Account Receivable in an amount not to exceed the proportion that
               the Recourse Amount bears to the face value of the Pledged
               Accounts Receivable; and

                    (iii)  the Company and the Subsidiaries shall be entitled to
               share (with the Special Purpose Entity), on a pari passu and pro
               rata basis (based upon the Special Purpose Entity's share
               described in clause (ii)), all proceeds (if any) derived from
               each Pledged Account Receivable.

          "PERSON" shall mean and include an individual, a partnership, a joint
venture, a corporation, a trust, an unincorporated organization and a government
or any department or agency thereof.

          "PLAN" shall mean an "employee pension benefit plan" (as defined in
section 3 of ERISA) that is or has been established or maintained, or to which
contributions are or have been made, by the Company or by any trade or business,
whether or not incorporated, that, together with the Company, is under common
control, as described in section 414(b) or (c) of the Code.

          "PLEDGED ACCOUNTS RECEIVABLE" shall have the meaning specified in the
definition of "Permitted Securitization Program."

          "PRIVATE PLACEMENT MEMORANDUM" shall mean the Private Placement
Memorandum dated September 1995, relating to the offering of the Notes, prepared
by the Company and NationsBanc Capital Markets, Inc.

          "PURCHASERS" shall mean the purchasers of the Notes identified on the
signature pages hereof.

          "RECEIVABLES INVESTMENT" shall have the meaning specified in the
definition of "Permitted Securitization Program."

          "RECEIVABLES PURCHASE AGREEMENT" shall mean that certain Receivables
Purchase Agreement dated as of February 28, 1995, among the Company, Receivables
Capital Corporation and Bank of America National Trust and Savings Association,
as the provisions thereof have heretofore been amended or waived or may be from
time to time amended or waived.

                                      38
<PAGE>
 
          "REQUIRED HOLDER(S)" shall mean, with respect to the Notes, at any
time, the holder or holders of at least 66 2/3% of the aggregate principal
amount of the Notes outstanding at such time.

          "RESTRICTED PAYMENT" shall mean (a) any dividend paid or declared by
the Company or any Subsidiary on any class of the Company's stock (other than a
dividend payable in shares of stock of the Company), or any other distribution
made by the Company or any Subsidiary on account of any class of the Company's
stock, or (b) any cash or other consideration applied, directly or indirectly,
by the Company or any Subsidiary to the redemption, purchase or other
acquisition of any shares of the Company's capital stock or (c) any payment of
principal of, or retirement, redemption, purchase or other acquisition of any
subordinated debt.

          "REVOLVING LOAN AGREEMENT" shall mean that certain First Restated Loan
Agreement (Revolver) dated as of September 2, 1994, among the Company, its
Subsidiaries, NationsBank, as Agent, and the lenders parties thereto, as the
provisions thereof have heretofore been amended or waived or may be from time to
time amended or waived in compliance with paragraph 6E.

          "SECURITIES ACT" shall mean the Securities Act of 1933, as amended.

          "SHORT HEDGE FUTURE" shall mean an agreement, purchased on a
commodities exchange or entered into with a Counterparty, that obligates the
Company to sell natural gas or liquid hydrocarbons, as the case may be, at a
pre-determined price at a pre-determined time.

          "STANDARD & POOR'S"  shall mean Standard & Poor's Ratings Group.

          "STOCK OPTION AGREEMENTS" shall mean, collectively those certain
Agreements to Provide Loan(s) to exercise key employees' Stock Options by and
among the Company and certain key employees.

          "SUBSIDIARY" shall mean any corporation organized under the laws of
any state of the United States of America, Canada, or any province of Canada,
which conducts the major portion of its business in and makes the major portion
of its sales to Persons located in the United States of America or Canada, and
at least a majority of the combined voting power of all classes of Voting Stock
of which shall, at the time as of which any determination is being made, be
owned by the Company either directly or through Subsidiaries.  A "WHOLLY OWNED
SUBSIDIARY" shall be a Subsidiary all of the stock of every class of which,
except directors' qualifying shares shall, at the time at which any
determination is being made, be owned by the Company either directly or through
wholly owned subsidiaries.

          "TERMINATION EVENT" shall mean (i) a "reportable event" described in
Section 4043 of ERISA and the regulations issued thereunder (other than a
reportable event not subject to the provision for 30-day notice to the PBGC
under such regulations), or (ii) the withdrawal of the

                                      39
<PAGE>
 
Company or any of its ERISA Affiliates from a Plan during a plan year in which
it was a "substantial employer" as defined in Section 4001(a)(2) of ERISA, or
(iii) the filing of a notice of intent to terminate a Plan or the treatment of a
Plan amendment as a termination under Section 4041 of ERISA, or (iv) the
institution of proceedings to terminate a Plan by the PBGC, or (v) any other
event or condition that might constitute grounds under Section 4042 of ERISA for
the termination of, or the appointment of a trustee to administer, any Plan.

          "TERM LOAN AGREEMENT" shall mean that certain Third Restated Loan
Agreement (Term) dated as of August 31, 1993, among the Company, its
Subsidiaries, NationsBank, as Agent and the lenders parties thereto, as the
provisions thereof have heretofore been amended or waived or may be from time to
time amended or waived in compliance with paragraph 6E.

          "TRANSFEREE" shall mean any direct or indirect transferee of all or
any part of any Note purchased by any Purchaser under this Agreement.

          "VOTING STOCK" shall mean, with respect to any corporation, any shares
of stock of such corporation whose holders are entitled under ordinary
circumstances to vote for the election of directors of such corporation
(irrespective of whether at the time stock of any other class or classes shall
have or might have voting power by reason of the happening of any contingency).

          "WHOLLY OWNED SUBSIDIARY" shall have the meaning specified in the
definition of "Subsidiary."

          1.10C. ACCOUNTING TERMS AND DETERMINATIONS.  All references in this
Agreement to "generally accepted accounting principles" shall be deemed to refer
to generally accepted accounting principles in effect in the United States at
the time of application thereof, subject to the next sentence. Unless otherwise
specified herein, all accounting terms used herein shall be interpreted, all
determinations with respect to accounting matters hereunder shall be made, and
all financial statements and certificates and reports as to financial matters
required to be furnished hereunder shall be prepared, in accordance with
generally accepted accounting principles, applied on a basis consistent with the
audited consolidated financial statements of the Company and its Subsidiaries
delivered pursuant to clause (ii) of paragraph 5A or, if no such statements have
been delivered, the most recent audited financial statements referred to in
clause (i) of paragraph 8B.

PARAGRAPH 11.     MISCELLANEOUS.

          11A.  NOTE PAYMENTS.  The Company agrees that, so long as any
Purchaser shall hold any Note, it will make payments of principal of, interest
on and any Yield-Maintenance Amount payable with respect to such Note, which
comply with the terms of this Agreement, by wire transfer of immediately
available funds for credit (not later than 12:00 noon, New York City time, on
the date due) to each Purchaser's account or accounts, if any, as are specified
in the PURCHASER SCHEDULE attached hereto, or, in the case any Purchaser wishes
to change the account specified for such Purchaser in the PURCHASER SCHEDULE
such account or accounts in the United States as such

                                      40
<PAGE>
 
Purchaser may from time to time designate in writing, notwithstanding any
contrary provision herein or in any Note with respect to the place of payment.
Each Purchaser agrees that, before disposing of any Note, such Purchaser will
make a notation thereon (or on a schedule attached thereto) of all principal
payments previously made thereon and of the date to which interest thereon has
been paid. The Company agrees to afford the benefits of this paragraph 11A to
any Transferee which shall have made the same agreement as the Purchasers have
made in this paragraph 11A.

         11B. EXPENSES.

         (I)    GENERALLY.  Whether or not the transactions contemplated
     hereby shall be consummated, the Company will promptly (and in any event
     within thirty (30) days after receiving any statement or invoice therefor)
     pay, and save each Purchaser and any Transferee harmless against liability
     for the payment of, all reasonable fees, expenses and costs relating
     hereto, including, but not limited to:

               (a)  the cost of reproducing this Agreement and the Notes;

               (b)  the fees and disbursements of any special counsel engaged
          by the Purchasers;

               (c)  the cost of delivering to each Purchaser's home office or
          custodian bank, insured to such Purchaser's satisfaction, the Notes
          purchased by such Purchaser at the Closing;

               (d)  the fees, expenses and costs incurred complying with each
          of the conditions to closing set forth in paragraph 3 hereof
          (including, without limitation the fees, expenses and costs incurred
          obtaining a Private Placement Number for the Notes);

               (e)  the fees, expenses and costs of NationsBanc Capital
          Markets, Inc. and any other broker or investment banker, if any,
          incurred by the Company in connection with the offer, issuance, sale
          and delivery of the Notes or the transactions contemplated hereby;

               (f)  the fees, expenses and costs relating to the consideration,
          negotiation, preparation, duplication or execution of any amendments,
          waivers or consents pursuant to the provisions hereof (including,
          without limitation, fees and disbursements of any special counsel or
          other professional advisors engaged by such Purchaser and the
          allocated cost of each Purchaser's or Transferee's counsel who are
          such Purchaser's or such Transferee's employees or such Purchaser's or
          such Transferee's affiliates' employees), whether or not any such
          amendments, waivers or consents are executed; and

                                      41
<PAGE>
 
                (g)  the fees, expenses and costs incurred by any Purchaser or
          any Transferee in enforcing (or determining whether or how to enforce)
          any rights under this Agreement, the Notes or the Guaranties or in
          responding to any subpoena or other legal process or informal
          investigative demand issued in connection with this Agreement or the
          transactions contemplated hereby or by reason of any Purchaser's or
          any Transferee's having acquired any Note (other than costs and
          expenses incurred in acquiring or merely holding a Note or interest
          therein), including without limitation fees, expenses and costs
          incurred in any bankruptcy case.

          (II)  COUNSEL.  Without limiting the generality of the foregoing, it
     is agreed and understood that the Company will pay, at the time of the
     execution of this Agreement, the statement, rendered as set forth in
     paragraph 3H, for reasonable fees and disbursements of any special counsel
     engaged by the Purchasers incurred up to that time, and the Company will
     also pay, upon receipt of any statement thereof, each additional statement
     for reasonable fees and disbursements of any special counsel engaged by the
     Purchasers rendered at and after the Closing in connection with the
     issuance of the Notes or the matters referred to in paragraphs 11B(i)(f) or
     11B(i)(g) hereof.

          (III) SURVIVAL.  The obligations of the Company under this paragraph
     11B and under the final sentence of paragraph 5J shall survive the transfer
     of any Note or portion thereof or interest therein by any Purchaser or any
     Transferee, the payment or prepayment of the Notes and the termination
     hereof.

          11C. CONSENT TO AMENDMENTS.  This Agreement may be amended, and
the Company may take any action herein prohibited, or omit to perform any act
herein required to be performed by it, if the Company shall obtain the written
consent to such amendment, action or omission to act, of the Required Holder(s)
of the Notes except that, (i) with the written consent of the holders of all
Notes at the time outstanding (and not without such written consents), the Notes
may be amended or the provisions thereof waived to change the maturity thereof,
to change the principal thereof, or to change the rate or time of payment of
interest on or any Yield-Maintenance Amount payable with respect to the Notes,
and (ii) without the written consent of the holder or holders of all Notes at
the time outstanding, no amendment to or waiver of the provisions of this
Agreement shall change the provisions of paragraph 7A or this paragraph 11C
insofar as such provisions relate to proportions of the principal amount of the
Notes, or the rights of any individual holder of Notes, required with respect to
any declaration of Notes to be due and payable or with respect to any consent.
Each holder of any Note at the time or thereafter outstanding shall be bound by
any consent authorized by this paragraph 11C, whether or not such Note shall
have been marked to indicate such consent, but any Notes issued thereafter may
bear a notation referring to any such consent.  No course of dealing between the
Company and the holder of any Note nor any delay in exercising any rights
hereunder or under any Note shall operate as a waiver of any rights of any
holder of such Note.  As used herein and in the Notes, the term "THIS AGREEMENT"
and references thereto shall mean this Note Purchase Agreement as it may from
time to time be amended or supplemented.

                                      42
<PAGE>
 
         11D. SOLICITATION OF NOTEHOLDERS.

                (i)      SOLICITATION.  Neither the Company nor any Guarantor
     shall solicit, request or negotiate for or with respect to any proposed
     waiver or amendment of any of the provisions hereof or of the Notes or the
     Guaranties unless each holder of the Notes (irrespective of the amount of
     Notes then owned by it) shall be informed thereof by the Company with
     sufficient information to enable it to make an informed decision with
     respect thereto. Executed or true and correct copies of any waiver or
     consent effected pursuant to the provisions of this paragraph 11D shall be
     delivered by the Company to each holder of outstanding Notes forthwith
     following the date on which the same shall have been executed and delivered
     by all holders of outstanding Notes required to consent or agree to such
     waiver or consent.

                (ii)     PAYMENT.  Neither the Company nor any Guarantor shall,
     directly or indirectly, pay or cause to be paid any remuneration, whether
     by way of supplemental or additional interest, fee or otherwise, or grant
     any security, to any holder of Notes as consideration for or as an
     inducement to the entering into by any holder of Notes of any waiver or
     amendment of any of the terms and provisions hereof or of the Notes or the
     Guaranties unless such remuneration is concurrently paid, or security is
     concurrently granted, on the same terms, ratably to the holders of all
     Notes then outstanding.

                (iii)    SCOPE OF CONSENT.  Any consent made pursuant to this
     paragraph 11D by a holder of Notes that has transferred or has agreed to
     transfer its Notes to the Company, any Subsidiary or any Affiliate and has
     provided or has agreed to provide such written consent as a condition to
     such transfer shall be void and of no force and effect except solely as to
     such holder, and any amendments effected or waivers granted or to be
     effected or granted that would not have been or would not be so effected or
     granted but for such consent (and the consents of all other holders of
     Notes that were acquired under the same or similar conditions) shall be
     void and of no force and effect, retroactive to the date such amendment or
     waiver initially took or takes effect, except solely as to such holder.
 
          11E. FORM, REGISTRATION, TRANSFER AND EXCHANGE OF NOTES; LOST NOTES.
The Notes are issuable as registered notes without coupons in denominations of
at least $500,000, except as may be necessary to reflect any principal amount
not evenly divisible by $100,000. The Company shall keep at its principal office
a register in which the Company shall provide for the registration of Notes and
of transfers of Notes. Upon surrender for registration of transfer of any Note
at the principal office of the Company, the Company shall, at its expense,
execute and deliver one or more new Notes of like tenor and of an aggregate
principal amount, registered in the name of such transferee or transferees;
PROVIDED that the Company shall not be required to register any transfer that
was made in violation of the legend appearing on such Note. At the option of the
holder of any Note, such Note may be exchanged for other Notes of like tenor and
of any authorized denominations, of a like aggregate principal amount, upon
surrender of the Note to be exchanged at the principal office of the Company.
Whenever any Notes are so surrendered for exchange, the

                                      43
<PAGE>
 
Company shall, at its expense, execute and deliver the Notes which the holder
making the exchange is entitled to receive.  Each installment of principal
payable on each installment date upon each new Note issued upon any such
transfer or exchange shall be in the same proportion to the unpaid principal
amount of such new Note as the installment of principal payable on such date on
the Note surrendered for registration of transfer or exchange bore to the unpaid
principal amount of such Note. No reference need be made in any such new Note to
any installment or installments of principal previously due and paid upon the
Note surrendered for registration of transfer or exchange.  Every Note
surrendered for registration of transfer or exchange shall be duly endorsed, or
be accompanied by a written instrument of transfer duly executed, by the holder
of such Note or such holder's attorney duly authorized in writing.  Any Note or
Notes issued in exchange for any Note or upon transfer thereof shall carry the
rights to unpaid interest and interest to accrue which were carried by the Note
so exchanged or transferred, so that neither gain nor loss of interest shall
result from any such transfer or exchange.  Upon receipt of written notice from
the holder of any Note of the loss, theft, destruction or mutilation of such
Note and, in the case of any such loss, theft or destruction, upon receipt of
such holder's unsecured indemnity agreement, or in the case of any such
mutilation upon surrender and cancellation of such Note, the Company will make
and deliver a new Note, of like tenor, in lieu of the lost, stolen, destroyed or
mutilated Note.

          11F. PERSONS DEEMED OWNERS; PARTICIPATIONS.  Prior to due
presentment for registration of transfer, the Company may treat the Person in
whose name any Note is registered as the owner and holder of such Note for the
purpose of receiving payment of principal of and interest on and any Yield-
Maintenance Amount payable with respect to such Note and for all other purposes
whatsoever, whether or not such Note shall be overdue, and the Company shall not
be affected by notice to the contrary. Subject to the preceding sentence, the
holder of any Note may from time to time grant participations in all or any part
of such Note to any Person on such terms and conditions as may be determined by
such holder in its sole and absolute discretion.

          11G.    SURVIVAL OF REPRESENTATIONS AND WARRANTIES; ENTIRE
AGREEMENT. All representations and warranties contained herein or made in
writing by or on behalf of the Company in connection herewith shall survive the
execution and delivery of this Agreement and the Notes, the transfer by any
Purchaser of any Note or portion thereof or interest therein and the payment of
any Note, and may be relied upon by any Transferee, regardless of any
investigation made at any time by or on behalf of any Purchaser or any
Transferee.  Subject to the preceding sentence, this Agreement and the Notes
embody the entire agreement and understanding between the parties hereto with
respect to the subject matter hereof and supersede all prior agreements and
understandings relating to such subject matter.

          11H.    SUCCESSORS AND ASSIGNS.  All covenants and other agreements
in this Agreement contained by or on behalf of any of the parties hereto shall
bind and inure to the benefit of the respective successors and assigns of the
parties hereto (including, without limitation, any Transferee) whether so
expressed or not.

                                      44
<PAGE>
 
          11I.  DISCLOSURE TO OTHER PERSONS; CONFIDENTIALITY.  EXCEPT AS
PROVIDED IN THIS PARAGRAPH 11I, EACH HOLDER AND EACH PERSON WHO PURCHASES A
PARTICIPATION IN A NOTE OR ANY PART THEREOF AGREES THAT, PRIOR TO THE OCCURRENCE
OF A DEFAULT, IT WILL USE ITS BEST EFFORTS TO HOLD IN CONFIDENCE AND NOT TO
DISCLOSE THE CONFIDENTIAL INFORMATION.  The Company acknowledges that the holder
of any Note may deliver copies of any financial statements and other documents
delivered to such holder, and disclose any other information disclosed to such
holder, by or on behalf of the Company or any Subsidiary in connection with or
pursuant to this Agreement to (i) such holder's directors, officers, employees,
agents and professional consultants, (ii) any other holder of any Note, (iii)
any Person to which such holder offers to sell such Note or any part thereof,
(iv) any Person to which such holder sells or offers to sell a participation in
all or any part of such Note, (v) any federal or state regulatory authority
having jurisdiction over such holder, (vi) the National Association of Insurance
Commissioners or any similar organization or (vii) any other Person to which
such delivery or disclosure may be necessary or appropriate (a) in compliance
with any law, rule, regulation or order applicable to such holder, (b) in
response to any subpoena or other legal process or informal investigative
demand, (c) in connection with any litigation to which such holder is a party or
(d) in order to protect such holder's investment in such Note; PROVIDED THAT
                                                               --------     
PRIOR TO DISCLOSING CONFIDENTIAL INFORMATION TO ANY OFFEREE REFERRED TO IN
CLAUSES (III) AND (IV) ABOVE, SUCH HOLDER WILL USE ITS BEST EFFORTS TO HAVE SUCH
OFFEREE DELIVER TO THE COMPANY A CONFIDENTIALITY AGREEMENT SUBSTANTIALLY IN THE
FORM OF EXHIBIT D HERETO.

          11J. NOTICES.  All written communications provided for hereunder
shall be sent by first class mail or nationwide overnight delivery service (with
charges prepaid) and (i) if to any Purchaser, addressed to such Purchaser at the
address specified for such communications in the PURCHASER SCHEDULE, or at such
other address as such Purchaser shall have specified in writing to the Person
sending such communication, and (ii) if to any other holder of any Note,
addressed to it at such address as it shall have specified in writing to the
Person sending such communication or, if any such holder shall not have so
specified an address, then addressed to such holder in care of the last holder
of such Note which shall have so specified an address to the Person sending such
communication, and (iii) if to the Company, addressed to it at 12200 N. Pecos
Street, Denver, Colorado 80234, Attention: John C. Walter, Executive Vice
President-General Counsel, Telecopy No. (303) 252-3362 or at such other address
as the Company shall have specified to the holder of each Note in writing;
PROVIDED, however, that any such communication to the Company may also, at the
option of the Person sending such communication, be delivered by any other means
either to the Company at its address specified above or to any Authorized
Officer of the Company.

          11K.    PAYMENTS DUE ON NON-BUSINESS DAYS.  Anything in this
Agreement or the Notes to the contrary notwithstanding, any payment of principal
of or interest on any Note that is due on a date other than a Business Day shall
be made on the next succeeding Business Day.  If the date for any payment is
extended to the next succeeding Business Day by reason of the preceding
sentence, the period of such extension shall be included in the computation of
the interest payable on such Business Day.

                                      45
<PAGE>
 
          11L. SATISFACTION REQUIREMENT.  If any agreement, certificate or
other writing, or any action taken or to be taken, is by the terms of this
Agreement required to be satisfactory to any Purchaser, to any holder of Notes
or to the Required Holder(s), the determination of such satisfaction shall be
made by such Purchaser, such holder or the Required Holder(s), as the case may
be, in the sole and exclusive judgment (exercised in good faith) of the Person
or Persons making such determination.

          11M.    GOVERNING LAW.  THIS AGREEMENT SHALL BE CONSTRUED AND
                  -------------                                        
ENFORCED IN ACCORDANCE WITH, AND THE RIGHTS OF THE PARTIES SHALL BE GOVERNED BY,
THE LAW OF THE STATE OF NEW YORK.

          11N. LIMITATION ON INTEREST.  The Company and the Purchasers
specifically intend and agree to limit contractually the amount of interest
payable in connection with this Agreement and the Notes to the maximum amount of
interest lawfully permitted to be charged under applicable law. Therefore, none
of the terms of this Agreement or the Notes shall ever be construed to create a
contract to pay interest at a rate in excess of the maximum rate permitted to be
charged under applicable law, and neither the Company nor any Guarantor nor any
other party liable or to become liable hereunder or under the Notes shall ever
be liable for interest in excess of the amount determined at such maximum rate.

          11O.    SEVERABILITY.  Any provision of this Agreement which is
prohibited or unenforceable in any jurisdiction shall, as to such jurisdiction,
be ineffective to the extent of such prohibition or unenforceability without
invalidating the remaining provisions hereof, and any such prohibition or
unenforceability in any jurisdiction shall not invalidate or render
unenforceable such provision in any other jurisdiction.

          11P. DESCRIPTIVE HEADINGS.  The descriptive headings of the
several paragraphs of this Agreement are inserted for convenience only and do
not constitute a part of this Agreement.

          11Q.    COUNTERPARTS.  This Agreement may be executed
simultaneously in two or more counterparts, each of which shall be deemed an
original, and it shall not be necessary in making proof of this Agreement to
produce or account for more than one such counterpart.

          11R. BINDING AGREEMENT.  When this Agreement is executed and
delivered by the Company and each Purchaser, it shall become a binding agreement
between the Company and the Purchasers.

     [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK.  SIGNATURE PAGES FOLLOW.]

                                      46
<PAGE>
 
          If all of the Purchasers are in agreement with the foregoing, please
sign the form of acceptance on the enclosed counterparts of this letter and
return the same to the Company, whereupon this letter shall become a binding
agreement between the Company and the Purchasers effective as of November 29,
1995.

                                        Very truly yours,

                                        WESTERN GAS RESOURCES, INC.


                                        /s/ WILLIAM J. KRYSIAK
                                        ----------------------
                                        Vice President-Finance

The foregoing Agreement is
hereby accepted as of the
date first above written.

THE VARIABLE ANNUITY
LIFE INSURANCE COMPANY


By: /s/ THE VARIABLE ANNUITY LIFE INSURANCE COMPANY
    -----------------------------------------------
     [Title]


AMERICAN GENERAL LIFE
INSURANCE COMPANY


By: /s/ AMERICAN GENERAL LIFE INSURANCE COMPANY
    -------------------------------------------
     [Title]


GULF LIFE INSURANCE COMPANY


By: /s/ GULF LIFE INSURANCE COMPANY
    -------------------------------
     [Title]


                                      47
<PAGE>
 
FIRST ALLMERICA FINANCIAL 
LIFE INSURANCE COMPANY

By: /s/ FIRST ALLMERICA FINANCIAL
        LIFE INSURANCE COMPANY
    -----------------------------
     [Title]


ALLMERICA FINANCIAL LIFE
INSURANCE AND ANNUITY COMPANY

By: /s/ ALLMERICA FINANCIAL LIFE
        INSURANCE AND ANNUITY COMPANY
    ---------------------------------
     [Title]


THE MUTUAL LIFE INSURANCE 
COMPANY OF NEW YORK

By: /s/ THE MUTUAL LIFE INSURANCE
        COMPANY OF NEW YORK
    -----------------------------
     [Title]

                                      48

<PAGE>
 
                    FIFTH AMENDMENT TO FIRST RESTATED LOAN
                             AGREEMENT (REVOLVER)

     THIS FIFTH AMENDMENT TO FIRST RESTATED LOAN AGREEMENT (REVOLVER) (herein
called the "Amendment") made as of the 22nd day of March, 1996, by and among
Western Gas Resources, Inc., a Delaware corporation ("Borrower"), NationsBank of
Texas, N.A., a national banking association, as Agent ("Agent"), and NationsBank
of Texas, N.A., Bank of Montreal, CIBC Inc., Societe Generale, Southwest Agency,
The First National Bank of Boston, Colorado National Bank, Bank of America
National Trust and Savings Association and Credit Lyonnais Cayman Island Branch,
(herein, collectively referred to as "Lenders").

                             W I T N E S S E T H:

     WHEREAS, Borrower, Agent and Lenders have entered into that certain First
Restated Loan Agreement (Revolver) dated as of September 2, 1994, as amended by
that certain First Amendment to First Restated Loan Agreement (Revolver) dated
as of December 2, 1994, that certain Second Amendment to First Restated Loan
Agreement (Revolver) dated as of February 23, 1995, that certain Third Amendment
to First Restated Loan Agreement (Revolver) dated as of July 19, 1995, and that
certain Fourth Amendment to First Restated Loan Agreement (Revolver) dated as of
November 29, 1995 (as amended to the date hereof, the "Original Agreement") for
the purpose and consideration therein expressed, whereby Lenders became
obligated to make and made loans to Borrower as therein provided; and

     WHEREAS, Borrower, Agent and Lenders desire to amend the Original Agreement
as expressly set forth herein;

     NOW, THEREFORE, in consideration of the premises and the mutual covenants
and agreements contained herein and in the Original Agreement and in
consideration of the loans which may hereafter be made by Lenders to Borrower,
and for other good and valuable consideration, the receipt and sufficiency of
which are hereby acknowledged, the parties hereto do hereby agree as follows:

                                       1

                                                                   Exhibit 10.53
<PAGE>
 
                   ARTICLE I. -- Definitions and References
                                 --------------------------

     Section 1.1.  Terms Defined in the Original Agreement.  Unless the context
                   ---------------------------------------                     
otherwise requires or unless otherwise expressly defined herein, the terms
defined in the Original Agreement shall have the same meanings whenever used in
this Amendment.

     Section 1.2.  Other Defined Terms.  Unless the context otherwise requires,
                   -------------------                                         
the following terms when used in this Amendment shall have the meanings assigned
to them in this Section 1.2.

          "Amendment" means this Fifth Amendment to First Restated Loan
           ---------                                                   
     Agreement (Revolver).

          "Loan Agreement" shall mean the Original Agreement as amended hereby.
           --------------                                                      


                           ARTICLE II. -- Amendments
                                          ----------

     Section 2.1.  Definitions. (a)  The definition of "Commitment Period" in
                   -----------                                               
Section 1.1 of the Original Agreement is hereby amended in its entirety to read
as follows:

          "`Commitment Period' means the period from and including the Closing
            -----------------                                                 
     Date until and including the earlier of October 1, 1997 or the day on which
     the Notes become due and payable in full."



                                       2
<PAGE>
 
     (b)  The definition of "Preferred Stock" in Section 1.1 of the Original
Agreement is hereby amended in its entirety to read as follows:

          "`Preferred Stock' means all issued and outstanding preferred stock of
            ---------------                                                     
     Borrower, as the same may change from time to time, including but not
     limited to  (i) the 1,400,000 shares of $2.28 Cumulative Preferred Stock of
     Borrower and (ii) the 2,760,000 shares of $2.625 Cumulative Convertible
     Preferred Stock of Borrower."

     (c)  The definition of "Additional Preferred Stock" is hereby deleted from
Section 1.1 of the Original Agreement.



                                       3
<PAGE>
 
     Section 2.2.  Scheduled Payments.  Section 2.6 of the Original Agreement is
                   ------------------                                           
hereby amended in its entirety to read as follows:

          "Section 2.6.  Scheduled Payments.  The principal amount of the Notes
                         ------------------                                    
     shall be due and payable in twelve quarterly installments, each of which
     shall be equal to one-twelfth of the aggregate unpaid principal balance of
     the Loans at the end of the Commitment Period.  These prepayments shall be
     due and payable on the first day of each January, April, July and October,
     beginning on and including January 1, 1998, and continuing regularly
     thereafter until and including October 1, 2000, the date on which the Notes
     become due and payable in full.  Each principal payment made under this
     section shall be apportioned and applied to each Lender's Note in
     accordance with such Lender's Loan Share of such payment.  Any principal
     prepaid pursuant to this section shall be in addition to and not in lieu
     of, all payments otherwise required to be made under the Loan Documents at
     the time of such prepayment."

     Section 2.3.  Limitation on Dividends and Distributions.  Section 6.2(a) of
                   -----------------------------------------                    
the Original Agreement is hereby amended in its entirety to read as follows and
such amendment shall be effective as of December 31, 1995.

          "(a)  Limitation on Dividends and Distributions.  Except for payments
                -----------------------------------------                      
     by Borrower to its stockholders which are permitted under the following
     sentences of this subsection and do not otherwise violate any provisions of
     this Agreement and except for dividends paid to Borrower by its
     Subsidiaries or to MIGC by MGTC, none of Borrower and its Subsidiaries will
     declare or pay any dividends on, or make any other distribution in respect
     of, any class of its capital stock or any partnership or other interest in
     it, other than the distribution of common stock pursuant to the conversion
     or exchange of Preferred Stock, nor will any of Borrower and its
     Subsidiaries directly or indirectly make any capital contribution to or
     purchase, redeem, acquire or retire any shares of the capital stock of or
     partnership interest in any of Borrower and its Subsidiaries (whether such
     interests are now or hereafter issued, outstanding or created) or cause or
     permit any reduction or retirement of the capital stock of or partnership
     interest in any of Borrower and its Subsidiaries.  Borrower may make any of
     the payments, distributions, capital contributions or purchases described
     above in this Section 6.2(a), so long as (i) no Default or Event of Default
     has occurred and is

                                       4
<PAGE>
 
     continuing at the time such dividends are declared and paid and (ii) such
     repurchases and dividends declared or paid by Borrower since December 31,
     1995, together with all investments Borrower has made in accordance with
     the provisions of Section 6.2(f)(vi), do not, in the aggregate, exceed the
     sum of (A) $10,000,000; plus (B) fifty percent (50.0%) of Borrower's
                             ----                                        
     Consolidated cumulative net income earned after December 31, 1995 if such
     figure is positive (zero percent, if there is a Consolidated cumulative net
     loss); plus (C) fifty percent (50.0%) of the cumulative net proceeds
            ----                                                         
     received by Borrower and its Subsidiaries at any time after December 31,
     1995 from the sale of any equity securities issued by Borrower or any of
     its Subsidiaries.  All dividends declared in the fourth Fiscal Quarter of
     1995, payable in 1996 with respect to any class of stock of Borrower, shall
     be permitted and excluded from the preceding calculation."

     Section 2.4.  Limitation on Mergers, Issuances of Securities.  The
                   ----------------------------------------------      
reference to the term "Additional Preferred Stock" in section 6.2(d) of the
Original Agreement is hereby deleted.

     Section 2.5.  Limitation on Investments and New Businesses.  Section 6.2(f)
                   --------------------------------------------                 
of the Original Agreement is hereby amended in its entirety to read as follows
and such amendment shall be effective as of December 31, 1995.

          "(f)  Limitation on Investments and New Businesses.  No Related Person
                --------------------------------------------                    
     will:

               (i) make any expenditure or commitment or incur any obligation or
          enter into or engage in any transaction except in the ordinary course
          of business (which shall be deemed to include expenditures,
          commitments, obligations and transactions permitted by clause (iii),
          (iv), (v) or (vi) of this sentence);

               (ii) engage directly or indirectly in any business or conduct any
          operations except in connection with or incidental to its present
          businesses and operations (which shall be deemed to include
          expenditures, commitments, obligations and transactions permitted by
          clause (iii), (iv), (v) or (vi) of this sentence);

               (iii) make any acquisitions of or capital contributions to or
          other investments in any Persons other than (A) capital contributions
          to and investments in Williston Gas Company and Subsidiaries already
          wholly owned by such Related Person and the joint ventures described
          on Schedule 4 hereto, and (B) deposits with any Lender, investments in
          obligations of any Lender or any of such Lender's Affiliates, time
          deposits in other banking institutions which, at the time such deposit
          is made, are rated "C" by Thomson BankWatch, Inc. and investments
          maturing within one year from the date of acquisition in direct
          obligations of or obligations supported by, the full faith and credit
          of, the United States of America,

                                       5
<PAGE>
 
               (iv) make any significant acquisitions or investments in any
          properties other than gas processing, transmission, gathering and
          storage facilities and domestic oil and gas properties;

                (v) make capital expenditures and/or general and administrative
          expenditures relating to power generation and power marketing which
          exceed in the aggregate $1,000,000, or;

               (vi) make any other investments unless (1) no Default or Event of
                                               ------                           
          Default has occurred and is continuing at the time such investment is
          made and (2) such investments, together with all repurchases and
          dividends declared or paid by Borrower since December 31, 1995 in
          accordance with the provisions of Section 6.2(a) (except for all
          dividends declared in the fourth Fiscal Quarter of 1995, payable in
          1996 with respect to any class of stock of Borrower), do not, in the
          aggregate, exceed the sum of (I) $10,000,000; plus (II) fifty percent
                                                        ----                   
          (50.0%) of Borrower's Consolidated cumulative net income earned after
          December 31, 1995 if such figure is positive (zero percent, if there
          is a Consolidated cumulative net loss); plus (III) fifty percent
                                                  ----                    
          (50.0%) of the cumulative net proceeds received by Borrower and its
          Subsidiaries at any time after December 31, 1995 from the sale of any
          equity securities issued by Borrower or any of its Subsidiaries.

     Notwithstanding the foregoing, if any Related Person makes an acquisition
     of any Person or property in accordance with the provisions of this Section
     6.2(f), and if the historical cash earnings of the Person or property so
     acquired would have to be included in the calculation of the Mandatory
     Prepayment Ratio most recently delivered to Agent and Lenders hereunder to
     support the Indebtedness, if any, incurred by such Related Person in making
     the acquisition, Borrower shall promptly notify Agent and Lenders of such
     fact and Lenders shall have the right to require a recalculation of the
     Mandatory Prepayment Ratio in accordance with the provisions of Section
     2.7(b) which ratio shall become effective at the time of such acquisition."

     Section 2.6.  Events of Default and Remedies.  (a)  All references to the
                   ------------------------------                             
term "Additional Preferred Stock" in section 8.1(i) of the Original Agreement
are hereby deleted.

     (b)  Section 8.1(k) of the Original Agreement is hereby amended in its
entirety to read as follows:

          "(k)  Any event occurs which would require Borrower to redeem for cash
     the Preferred Stock or any subordinated notes which may have been issued in
     exchange for the Preferred Stock, or which gives the holders of the
     Preferred Stock  or any subordinated notes which may have been issued in
     exchange for the Preferred Stock the right to demand such redemption; or"

                  ARTICLE III. -- Conditions of Effectiveness
                                  ---------------------------

                                       6
<PAGE>
 
     Section 3.1.  Effective Date.  This Amendment shall become effective as of
                   --------------                                              
the date first above written, except as otherwise provided herein, when, and
only when, Agent shall have received, at Agent's office, all of the following:

          (a)  Amendment.  A counterpart of this Amendment executed and
               ---------                                               
     delivered by Borrower and all Lenders.

          (b)  Amendment Fee.  An amendment fee equal to one-tenth of one-
               -------------                                             
     percent (0.10%) of the Commitment (as of the date hereof) of each Lender,
     payable to Agent for the account of each Lender.

          (c)  Officer's Certificate.  A certificate of a duly authorized
               ---------------------
     officer of Borrower, dated the date of receipt thereof by Agent, duly
     authorized, executed and delivered, and in form and substance satisfactory
     to Agent, to the effect that all of the representations and warranties set
     forth in Article IV hereof are true and correct at and as of the time of
     such effectiveness.

          (d)  Secretary's Certificate.  A certificate of the Secretary or
               -----------------------                                    
     Assistant Secretary of Borrower, dated as of the date of this Amendment,
     duly authorized, executed and delivered, and in form and substance
     satisfactory to Agent, which shall contain the names and signatures of the
     officers of Borrower authorized to execute Loan Documents on behalf of
     Borrower and which shall certify to the truth, correctness and completeness
     of the following exhibits attached thereto:  (i) a copy of resolutions
     adopted by the Board of Directors of Borrower, in full force and effect on
     the date hereof, authorizing the execution, delivery and performance of the
     Loan Documents, including this Amendment, (ii) a copy of Borrower's
     charter, certified by the appropriate official of the State of Delaware,
     and (iii) a copy of the bylaws of Borrower, in full force and effect on the
     date hereof.

          (d)  Legal Opinion.  a favorable opinion from Messr. John Walter,
               -------------                                               
     Esq., counsel for Borrower in a form acceptable to Agent.

          (e)  Supporting Documents.  such supporting documents as Agent may
               --------------------                                         
     reasonably request.


                 ARTICLE IV. -- Representations and Warranties
                                ------------------------------

                                       7
<PAGE>
 
     Section 4.1.  Representations and Warranties of Borrower.  In order to
                   ------------------------------------------              
induce each Lender to enter into this Amendment, Borrower represents and
warrants to each Lender that:

          (a)  The representations and warranties contained in each subsection
     of Section 5.1 of the Original Agreement are true and correct at and as of
     the time of the effectiveness hereof.

          (b)  Borrower is duly authorized to execute and deliver this Amendment
     and is and will continue to be duly authorized to borrow monies and to
     perform its obligations under the Loan Agreement.  Borrower has duly taken
     all corporate action necessary to authorize the execution and delivery of
     this Amendment and to authorize the performance of the obligations of
     Borrower hereunder.

          (c)  The execution and delivery by Borrower of this Amendment, the
     performance by Borrower of its obligations hereunder and the consummation
     of the transactions contemplated hereby do not and will not conflict with
     any provision of law, statute, rule or regulation or of the certificate of
     incorporation and bylaws of Borrower, or of any material agreement,
     judgment, license, order or permit applicable to or binding upon Borrower,
     or result in the creation of any lien, charge or encumbrance upon any
     assets or properties of Borrower.  Except for those which have been
     obtained, no consent, approval, authorization or order of any court or
     governmental authority or third party is required in connection with the
     execution and delivery by Borrower of this Amendment or to consummate the
     transactions contemplated hereby.

          (d)  When duly executed and delivered, each of this Amendment and the
     Loan Agreement will be a legal and binding obligation of Borrower,
     enforceable in accordance with its terms, except as limited by bankruptcy,
     insolvency or similar laws of general application relating to the
     enforcement of creditors' rights and by equitable principles of general
     application.

          (e)  The unaudited quarterly Consolidated financial statements of
     Borrower dated as of September 30, 1995 fairly present Borrower's
     Consolidated financial position at such date and the Consolidated results
     of Borrower's operations and changes in Borrower's Consolidated cash flow
     for the period thereof.  Copies of such financial statements have
     heretofore been delivered to each Lender.  Since September 30, 1995, no
     material adverse change has occurred in the financial condition or

                                       8
<PAGE>
 
     businesses or in the Consolidated financial condition or businesses of
     Borrower.

                          ARTICLE V. -- Miscellaneous
                                        -------------

     Section 5.1.  Consent to Amendment to Shelf Agreement.  Each Lender
                   ---------------------------------------              
consents and agrees that the Shelf Agreement as modified by the First Amended
and Restated Master Shelf Agreement dated January 31, 1996 complies with the
provision of Section 6.2(b)(viii) of the Loan Agreement and each Lender further
consents to such modifications for purposes of Section 8.1(i) of the Loan
Agreement.

     Section 5.2.  Ratification of Agreements.  The Original Agreement as hereby
                   --------------------------                                   
amended and each other Loan Document affected hereby are ratified and confirmed
in all respects.  Any reference to the Loan Agreement in any Loan Document shall
be deemed to be a reference to the Original Agreement as hereby amended.  The
execution, delivery and effectiveness of this Amendment shall not, except as
expressly provided herein or therein, operate as a waiver of any right, power or
remedy of Agent or Lenders under the Loan Agreement, or any other Loan Document
nor constitute a waiver of any provision of the Loan Agreement, or any other
Loan Document.

     Section 5.3.  Survival of Agreements.  All representations, warranties,
                   ----------------------                                   
covenants and agreements of Borrower herein shall survive the execution and
delivery of this Amendment and the performance hereof, including without
limitation the making or granting of the Loans, and shall further survive until
all of the Obligations are paid in full.  All statements and agreements
contained in any certificate or instrument delivered by Borrower or any Related
Person hereunder or under the Loan Agreement to any Lender shall be deemed to
constitute representations and warranties by, and/or agreements and covenants
of, Borrower under this Amendment and under the Loan Agreement.

     Section 5.4.  Loan Documents.  This Amendment is a Loan Document, and all
                   --------------                                             
provisions in the Loan Agreement pertaining to Loan Documents apply hereto.

     Section 5.5.  Governing Law.  This Amendment shall be governed by and
                   -------------                                          
construed in accordance with the laws of the State of Texas and any applicable
laws of the United States of America in all respects, including construction,
validity and performance.

                                       9
<PAGE>
 
     Section 5.6.  Counterparts.  This Amendment may be separately executed in
                   ------------                                               
counterparts and by the different parties hereto in separate counterparts, each
of which when so executed shall be deemed to constitute one and the same
Amendment.

     IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
executed as of the date first written above by their duly authorized officers.


                                  WESTERN GAS RESOURCES, INC.


                                  By: /s/ John C. Walter
                                     -------------------------------------
                                      John C. Walter
                                      Executive Vice President


                                  NATIONSBANK OF TEXAS, N.A.,
                                   as Agent, Issuing Bank and Lender


                                  By: /s/ Michele L. Jones
                                     -------------------------------------
                                      Michele L. Jones
                                      Vice President


                                  BANK OF AMERICA NATIONAL
                                  TRUST AND SAVINGS ASSOCIATION


                                  By: /s/ Gary M. Tsuyuki
                                     -------------------------------------
                                      Gary M. Tsuyuki
                                      Vice President

                                       10
<PAGE>
 
                                  BANK OF MONTREAL


                                  By: /s/ Don Skipper
                                     -------------------------------------
                                      Don Skipper
                                      Director


                                  THE FIRST NATIONAL BANK
                                   OF BOSTON


                                  By: /s/ Carol E. Holley
                                     -------------------------------------
                                      Carol E. Holley
                                      Vice President


                                  CREDIT LYONNAIS CAYMAN
                                  ISLAND BRANCH


                                  By: /s/ Pascal Poupelle
                                     -------------------------------------
                                      Pascal Poupelle
                                      Senior Vice President


                                  CIBC INC.


                                  By: /s/ Gary C. Gaskill
                                     -------------------------------------
                                      Gary C. Gaskill
                                      Vice President


                                  COLORADO NATIONAL BANK


                                  By: /s/ Kathryn S. Gaiter
                                     -------------------------------------
                                      Kathryn S. Gaiter
                                      Vice President

                                  SOCIETE GENERALE, SOUTHWEST
                                   AGENCY


                                  By: /s/ Richard A. Erbert
                                     -------------------------------------
                                      Richard A. Erbert
                                      Vice President

                                       11
<PAGE>
 
            CONFIRMATION, ACKNOWLEDGEMENT AND CONSENT OF GUARANTORS


     Each of the undersigned (collectively "Guarantors") hereby (i) acknowledges
and consents to the foregoing Fifth Amendment to First Restated Loan Agreement
(Revolver) of even date herewith by and among Western Gas Resources, Inc.,
NationsBank of Texas, N.A., as Agent ("Agent"), Bank of Montreal, CIBC Inc.,
Societe Generale, Southwest Agency, The First National Bank of Boston, Colorado
National Bank, Bank of America National Trust and Savings Association and Credit
Lyonnais Cayman Island Branch; (ii) confirms the Restated Guaranty dated as of
September 2, 1994 executed by such Guarantor in favor of Agent and the Lenders
pursuant to the Original Agreement; and (iii) agrees that each of such
Guarantor's obligations and covenants with respect to such Restated Guaranty
shall remain in full force and effect after the execution of such Amendment.

     William J. Krysiak, Vice President-Finance of Western Gas Resources
Oklahoma, Inc., Western Gas Resources Texas, Inc., Western Gas Resources
Storage, Inc., Mountain Gas Resources, Inc., MGTC, Inc. and MIGC, Inc., is
executing this Confirmation, Acknowledgment and Consent of Guarantors in his
capacity of officer of each such corporation.

     Dated as of the 22nd day of March, 1996.

                             WESTERN GAS RESOURCES OKLAHOMA, INC.
                             WESTERN GAS RESOURCES TEXAS, INC.
                             WESTERN GAS RESOURCES STORAGE, INC.
                             MOUNTAIN GAS RESOURCES, INC.
                             MGTC, INC.
                             MIGC, INC.



                             By:  /s/ William J. Krysiak
                                ---------------------------------------------
                                  William J. Krysiak, Vice President-Finance

<PAGE>
 
                                                                 

              SEVENTH AMENDMENT TO THIRD RESTATED LOAN AGREEMENT
                                    (TERM)


     THIS SEVENTH AMENDMENT TO THIRD RESTATED LOAN AGREEMENT (TERM) (herein
called the "Amendment") made as of the 22nd day of March, 1996, by and among
Western Gas Resources, Inc., a Delaware corporation ("Borrower"), NationsBank of
Texas, N.A., a national banking association, as Agent ("Agent"), and NationsBank
of Texas, N.A., Bankers Trust Company, Bank of Montreal and CIBC Inc. (herein,
collectively referred to as "Lenders"),

                             W I T N E S S E T H:

     WHEREAS, Borrower, Agent and Lenders have entered into that certain Third
Restated Loan Agreement (Term) dated as of August 31, 1993, as amended by that
certain First Amendment to Third Restated Loan Agreement (Term) dated as of
December 31, 1993, that certain Second Amendment to Third Restated Loan
Agreement (Term) dated as of September 2, 1994, that certain Third Amendment to
Third Restated Loan Agreement (Term) dated as of December 2, 1994, that certain
Fourth Amendment to Third Restated Loan Agreement (Term) dated as of February
23, 1995, that certain Fifth Amendment to Third Restated Loan Agreement (Term)
dated as of July 19, 1995, among Borrower, Agent and Lenders, and that certain
Sixth Amendment to Third Restated Loan Agreement (Term) dated as of November 29,
1995, among Borrower, Agent and Lenders (as amended to the date hereof, the
"Original Agreement") for the purpose and consideration therein expressed,
whereby Lenders became obligated to make and made loans to Borrower as therein
provided; and

     WHEREAS, Borrower, Agent and Lenders desire to amend the Original Agreement
as expressly set forth herein;

     NOW, THEREFORE, in consideration of the premises and the mutual covenants
and agreements contained herein and in the Original Agreement and in
consideration of the loans which may hereafter be made by Lenders to Borrower,
and for other good and valuable consideration, the receipt and sufficiency of
which are hereby acknowledged, the parties hereto do hereby agree as follows:

                                      -1-

                                                                   Exhibit 10.54
<PAGE>
 
                   ARTICLE I. -- Definitions and References
                                 --------------------------

     Section 1.1.  Terms Defined in the Original Agreement.  Unless the context
                   ---------------------------------------                     
otherwise requires or unless otherwise expressly defined herein, the terms
defined in the Original Agreement shall have the same meanings whenever used in
this Amendment.

     Section 1.2.  Other Defined Terms.  Unless the context otherwise requires,
                   -------------------                                         
the following terms when used in this Amendment shall have the meanings assigned
to them in this Section 1.2.

          "Amendment" means this Seventh Amendment to Third Restated Loan
           ---------                                                     
     Agreement (Term).

          "Loan Agreement" shall mean the Original Agreement as amended hereby.
           --------------                                                      

                           ARTICLE II. -- Amendments
                                          ----------

     Section 2.1.  Definitions.  (a)  The definition of "Preferred Stock" in
                   -----------                                             
Section 1.1 of the Original Agreement is hereby amended in its entirety to read
as follows:

          "`Preferred Stock' means all issued and outstanding preferred stock of
            ---------------                                                     
     Borrower, as the same may change from time to time, including but not
     limited to  (i) the 1,400,000 shares of $2.28 Cumulative Preferred Stock of
     Borrower and (ii) the 2,760,000 shares of $2.625 Cumulative Convertible
     Preferred Stock of Borrower."

     (b)  The definition of "Additional Preferred Stock" is hereby deleted from
Section 1.1 of the Original Agreement.

     Section 2.2.  Limitation on Dividends and Distributions.  Section 5.2(a) of
                   -----------------------------------------                    
the Original Agreement is hereby amended in its entirety to read as follows and
such amendment shall be effective as of December 31, 1995.

          "(a)  Limitation on Dividends and Distributions.  Except for payments
                -----------------------------------------                      
     by Borrower to its stockholders which are permitted under the following
     sentences of this subsection and do not otherwise violate any provisions of
     this Agreement and except for dividends paid to Borrower by its
     Subsidiaries or to MIGC by MGTC, none of Borrower and its Subsidiaries will
     declare or pay any dividends on, or make any other distribution in respect
     of, any class of its capital stock or any partnership or other interest in
     it, other than the distribution of common stock pursuant to the conversion
     or exchange of Preferred Stock, nor will any of Borrower and its
     Subsidiaries directly

                                      -2-
<PAGE>
 
     or indirectly make any capital contribution to or purchase, redeem, acquire
     or retire any shares of the capital stock of or partnership interest in any
     of Borrower and its Subsidiaries (whether such interests are now or
     hereafter issued, outstanding or created) or cause or permit any reduction
     or retirement of the capital stock of or partnership interest in any of
     Borrower and its Subsidiaries.  Borrower may make any of the payments,
     distributions, capital contributions or purchases described above in this
     Section 5.2(a), so long as (i) no Default or Event of Default has occurred
     and is continuing at the time such dividends are declared and paid and (ii)
     such repurchases and dividends declared or paid by Borrower since December
     31, 1995, together with all investments Borrower has made in accordance
     with the provisions of Section 5.2(f)(vi), do not, in the aggregate, exceed
     the sum of (A) $10,000,000; plus (B) fifty percent (50.0%) of Borrower's
                                 ----                                        
     Consolidated cumulative net income earned after December 31, 1995 if such
     figure is positive (zero percent, if there is a Consolidated cumulative net
     loss); plus (C) fifty percent (50.0%) of the cumulative net proceeds
            ----                                                         
     received by Borrower and its Subsidiaries at any time after December 31,
     1995 from the sale of any equity securities issued by Borrower or any of
     its Subsidiaries.  All dividends declared in the fourth Fiscal Quarter of
     1995, payable in 1996 with respect to any class of stock of Borrower, shall
     be permitted and excluded from the preceding calculation."

     Section 2.3.  Limitation on Mergers, Issuances of Securities.  The
                   ----------------------------------------------      
reference to the term "Additional Preferred Stock" in section 5.2(d) of the
Original Agreement is hereby deleted.

     Section 2.4.  Limitation on Investments and New Businesses.  Section 5.2(f)
                   --------------------------------------------                 
of the Original Agreement is hereby amended in its entirety to read as follows
and such amendment shall be effective as of December 31, 1995.

          "(f)  Limitation on Investments and New Businesses.  No Related Person
                --------------------------------------------                    
     will:

                (i) make any expenditure or commitment or incur any obligation
          or enter into or engage in any transaction except in the ordinary
          course of business (which shall be deemed to include expenditures,
          commitments, obligations and transactions permitted by clause (iii),
          (iv), (v) or (vi) of this sentence);

               (ii) engage directly or indirectly in any business or conduct any
          operations except in connection with or incidental to its present
          businesses and operations (which shall be deemed to include
          expenditures, commitments, obligations and transactions permitted by
          clause (iii), (iv), (v) or (vi) of this sentence);

              (iii) make any acquisitions of or capital contributions to or
          other investments in any Persons other than (A) capital contributions
          to and investments in Williston Gas Company and Subsidiaries already
          wholly owned

                                      -3-
<PAGE>
 
          by such Related Person and the joint ventures described on Schedule 4
          hereto, and (B) deposits with any Lender, investments in obligations
          of any Lender or any of such Lender's Affiliates, time deposits in
          other banking institutions which, at the time such deposit is made,
          are rated "C" by Thomson BankWatch, Inc. and investments maturing
          within one year from the date of acquisition in direct obligations of
          or obligations supported by, the full faith and credit of, the United
          States of America,

               (iv) make any significant acquisitions or investments in any
          properties other than gas processing, transmission, gathering and
          storage facilities and domestic oil and gas properties;

                (v) make capital expenditures and/or general and administrative
          expenditures relating to power generation and power marketing which
          exceed in the aggregate $1,000,000, or;

               (vi) make any other investments unless (1) no Default or Event of
                                               ------                           
          Default has occurred and is continuing at the time such investment is
          made and (2) such investments, together with all repurchases and
          dividends declared or paid by Borrower since December 31, 1995 in
          accordance with the provisions of Section 5.2(a) (except for all
          dividends declared in the fourth Fiscal Quarter of 1995, payable in
          1996 with respect to any class of stock of Borrower), do not, in the
          aggregate, exceed the sum of (I) $10,000,000; plus (II) fifty percent
                                                        ----                   
          (50.0%) of Borrower's Consolidated cumulative net income earned after
          December 31, 1995 if such figure is positive (zero percent, if there
          is a Consolidated cumulative net loss); plus (III) fifty percent
                                                  ----                    
          (50.0%) of the cumulative net proceeds received by Borrower and its
          Subsidiaries at any time after December 31, 1995 from the sale of any
          equity securities issued by Borrower or any of its Subsidiaries.

     Notwithstanding the foregoing, if any Related Person makes an acquisition
     of any Person or property in accordance with the provisions of this Section
     5.2(f), and if the historical cash earnings of the Person or property so
     acquired would have to be included in the calculation of the Mandatory
     Prepayment Ratio most recently delivered to Agent and Lenders hereunder to
     support the Indebtedness, if any, incurred by such Related Person in making
     the acquisition, Borrower shall promptly notify Agent and Lenders of such
     fact and Lenders shall have the right to require a recalculation of the
     Mandatory Prepayment Ratio in accordance with the provisions of Section
     2.5(a) which ratio shall become effective at the time of such acquisition."

     Section 2.5.  Events of Default and Remedies.  (a)  All references to the
                   ------------------------------                             
term "Additional Preferred Stock" in section 7.1(i) of the Original Agreement
are hereby deleted.

     (b)  Section 7.1(k) of the Original Agreement is hereby amended in its
entirety to read as follows:

                                      -4-
<PAGE>
 
          "(k) Any event occurs which would require Borrower to redeem for cash
     the Preferred Stock or any subordinated notes which may have been issued in
     exchange for the Preferred Stock, or which gives the holders of the
     Preferred Stock or any subordinated notes which may have been issued in
     exchange for the Preferred Stock the right to demand such redemption; or"

                  ARTICLE III. -- Conditions of Effectiveness
                                  ---------------------------

     Section 3.1.  Effective Date.  This Amendment shall become effective as of
                   --------------                                              
the date first above written, except as otherwise provided herein, when, and
only when, Agent shall have received, at Agent's office, all of the following:

          (a)  Amendment.  A counterpart of this Amendment executed and
               ---------                                               
     delivered by Borrower and Majority Lenders.

          (b)  Amendment Fee.  An amendment fee equal to one-tenth of one-
               -------------                                             
     percent (0.10%) of the outstanding principal balance of the Loans (as of 
     the date hereof) of each Lender, payable to Agent for the account of each 
     Lender.

          (c) Officer's Certificate.  A certificate of a duly authorized officer
              ---------------------                                             
     of Borrower, dated the date of receipt thereof by Agent, duly authorized,
     executed and delivered, and in form and substance satisfactory to Agent, to
     the effect that all of the representations and warranties set forth in
     Article IV hereof are true and correct at and as of the time of such
     effectiveness.

          (d) Secretary's Certificate.  A certificate of the Secretary or
              -----------------------                                    
     Assistant Secretary of Borrower, dated as of the date of this Amendment,
     duly authorized, executed and delivered, and in form and substance
     satisfactory to Agent, which shall contain the names and signatures of the
     officers of Borrower authorized to execute Loan Documents on behalf of
     Borrower and which shall certify to the truth, correctness and completeness
     of the following exhibits attached thereto:  (i) a copy of resolutions
     adopted by the Board of Directors of Borrower, in full force and effect on
     the date hereof, authorizing the execution, delivery and performance of the
     Loan Documents, including this Amendment, (ii) a copy of Borrower's
     charter, certified by the appropriate official of the State of Delaware,
     and (iii) a copy of the bylaws of Borrower, in full force and effect on the
     date hereof.

          (d)  Legal Opinion.  a favorable opinion from Messr. John Walter,
               -------------                                               
     Esq., counsel for Borrower in a form acceptable to Agent.

                                      -5-
<PAGE>
 
          (e)  Supporting Documents.  such supporting documents as Agent may
               --------------------                                         
     reasonably request.


                 ARTICLE IV. -- Representations and Warranties
                                ------------------------------

     Section 4.1.  Representations and Warranties of Borrower.  In order to
                   ------------------------------------------              
induce each Lender to enter into this Amendment, Borrower represents and
warrants to each Lender that:

          (a) The representations and warranties contained in each subsection of
     Section 4.1 of the Original Agreement are true and correct at and as of the
     time of the effectiveness hereof.

          (b) Borrower is duly authorized to execute and deliver this Amendment
     and is and will continue to be duly authorized to borrow monies and to
     perform its obligations under the Loan Agreement.  Borrower has duly taken
     all corporate action necessary to authorize the execution and delivery of
     this Amendment and to authorize the performance of the obligations of
     Borrower hereunder.

          (c) The execution and delivery by Borrower of this Amendment, the
     performance by Borrower of its obligations hereunder and the consummation
     of the transactions contemplated hereby do not and will not conflict with
     any provision of law, statute, rule or regulation or of the certificate of
     incorporation and bylaws of Borrower, or of any material agreement,
     judgment, license, order or permit applicable to or binding upon Borrower,
     or result in the creation of any lien, charge or encumbrance upon any
     assets or properties of Borrower.  Except for those which have been
     obtained, no consent, approval, authorization or order of any court or
     governmental authority or third party is required in connection with the
     execution and delivery by Borrower of this Amendment or to consummate the
     transactions contemplated hereby.

          (d) When duly executed and delivered, each of this Amendment and the
     Loan Agreement will be a legal and binding obligation of Borrower,
     enforceable in accordance with its terms, except as limited by bankruptcy,
     insolvency or similar laws of general application relating to the
     enforcement of creditors' rights and by equitable principles of general
     application.

                                      -6-
<PAGE>
 
          (e) The unaudited quarterly Consolidated financial statements of
     Borrower dated as of September 30, 1995 fairly present Borrower's
     Consolidated financial position at such date and the Consolidated results
     of Borrower's operations and changes in Borrower's Consolidated cash flow
     for the period thereof.  Copies of such financial statements have
     heretofore been delivered to each Lender.  Since September 30, 1995, no
     material adverse change has occurred in the financial condition or
     businesses or in the Consolidated financial condition or businesses of
     Borrower.

                          ARTICLE V. -- Miscellaneous
                                        -------------

     Section 5.1.  Consent to Amendment to Shelf Agreement.  Each Lender
                   ---------------------------------------              
consents and agrees that the Shelf Agreement as modified by the Second Amended
and Restated Master Shelf Agreement dated January 31, 1996 complies with the
provision of Section 5.2(b)(viii) of the Loan Agreement and each Lender further
consents to such modifications for purposes of Section 7.1(i) of the Loan
Agreement.

     Section 5.2.  Ratification of Agreements.  The Original Agreement as hereby
                   --------------------------                                   
amended and each other Loan Document affected hereby are ratified and confirmed
in all respects.  Any reference to the Loan Agreement in any Loan Document shall
be deemed to be a reference to the Original Agreement as hereby amended.  The
execution, delivery and effectiveness of this Amendment shall not, except as
expressly provided herein or therein, operate as a waiver of any right, power or
remedy of Agent or Lenders under the Loan Agreement, or any other Loan Document
nor constitute a waiver of any provision of the Loan Agreement, or any other
Loan Document.

     Section 5.3.  Survival of Agreements.  All representations, warranties,
                   ----------------------                                   
covenants and agreements of Borrower herein shall survive the execution and
delivery of this Amendment and the performance hereof, including without
limitation the making or granting of the Loans, and shall further survive until
all of the Obligations are paid in full.  All statements and agreements
contained in any certificate or instrument delivered by Borrower or any Related
Person hereunder or under the Loan Agreement to any Lender shall be deemed to
constitute representations and warranties by, and/or agreements and covenants
of, Borrower under this Amendment and under the Loan Agreement.

                                      -7-
<PAGE>
 
     Section 5.4.  Loan Documents.  This Amendment is a Loan Document, and all
                   --------------                                             
provisions in the Loan Agreement pertaining to Loan Documents apply hereto.

     Section 5.5.  Governing Law.  This Amendment shall be governed by and
                   -------------                                          
construed in accordance with the laws of the State of Texas and any applicable
laws of the United States of America in all respects, including construction,
validity and performance.

     Section 5.6.  Counterparts.  This Amendment may be separately executed in
                   ------------                                               
counterparts and by the different parties hereto in separate counterparts, each
of which when so executed shall be deemed to constitute one and the same
Amendment.

     IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
executed as of the date first written above by their duly authorized officers.

                                   WESTERN GAS RESOURCES, INC.


                                   By:  /s/ John C. Walter
                                      ------------------------------------------
                                           John C. Walter
                                           Executive Vice President


                                   NATIONSBANK OF TEXAS, N.A.               
                                                                            
                                                                            
                                   By:  /s/ Michele L. Jones                
                                      ------------------------------------------
                                           Michele L. Jones                     
                                           Vice President                       
                                                                              
                                                                              
                                   BANKERS TRUST COMPANY          
                                   ----------------------         
                                                                              
                                                                              
                                   By:  /s/ Mary Jo Jolly         
                                      ------------------------------------------
                                           Mary Jo Jolly
                                           Assistant Vice President             

                                      -8-
<PAGE>
 
                                   BANK OF MONTREAL


                                   By:  /s/ Don Skipper
                                      ------------------------------------------
                                           Don Skipper
                                           Director


                                   CIBC INC.
                  

                                   By:  /s/ Gary C. Gaskill
                                      ------------------------------------------
                                           Gary C. Gaskill
                                           Vice President

                                      -9-
<PAGE>
 
           CONFIRMATION, ACKNOWLEDGEMENT AND CONSENT OF GUARANTORS


     Each of the undersigned (collectively "Guarantors") hereby (i) acknowledges
and consents to the foregoing Seventh Amendment to Third Restated Loan Agreement
(Term) of even date herewith by and among Western Gas Resources, Inc.,
NationsBank of Texas, N.A., as Agent ("Agent"), Bankers Trust Company, Bank of
Montreal, and CIBC Inc.; (ii) confirms the Restated Guaranty dated as of
September 2, 1994 executed by such Guarantor in favor of Agent and the Lenders
pursuant to the Original Agreement; and (iii) agrees that each of such
Guarantor's obligations and covenants with respect to such Restated Guaranty
shall remain in full force and effect after the execution of such Amendment.

     William J. Krysiak, Vice President-Finance of Western Gas Resources
Oklahoma, Inc., Western Gas Resources Texas, Inc., Western Gas Resources
Storage, Inc., Mountain Gas Resources, Inc., MGTC, Inc. and MIGC, Inc., is
executing this Confirmation, Acknowledgment and Consent of Guarantors in his
capacity of officer of each such corporation.

     Dated as of the 22nd day of March, 1996.

                            WESTERN GAS RESOURCES OKLAHOMA, INC.
                            WESTERN GAS RESOURCES TEXAS, INC.   
                            WESTERN GAS RESOURCES STORAGE, INC. 
                            MOUNTAIN GAS RESOURCES, INC.        
                            MGTC, INC.                          
                            MIGC, INC.                           



                            By:   /s/ William J. Krysiak
                               -------------------------------------------------
                                 William J. Krysiak, Vice President-Finance

                                      -11-

<PAGE>
 
                          WESTERN GAS RESOURCES, INC.
                       COMPUTATION OF PER SHARE EARNINGS
                               DECEMBER 31, 1995

<TABLE>
<CAPTION>
                                                               Weighted
                                                               Average
                                                              Shares Of                      Earnings
                                                                Common                       Per Share
                                                                Stock           Net          Of Common
                                                             Outstanding   Income (Loss)       Stock
                                                             -----------   -------------   -------------
<S>                                                        <C>             <C>             <C>     
Net Income (Loss).......................................                     $(6,108,000)

Weighted average shares of common stock outstanding.....      25,753,738

Less redemption premium and up-front costs associated 
  with the 7.25% cumulative senior perpetual 
  convertible preferred stock...........................                      (3,784,000)

Less preferred stock dividends:
  7.25% cumulative senior perpetual convertible 
    preferred stock.....................................                      (1,208,000)
  $2.28 cumulative preferred stock......................                      (3,194,000)
  $2.625 cumulative convertible preferred stock.........                      (7,245,000)
                                                             -----------    ------------  
                                                              25,753,738    $(21,539,000)
                                                             ===========    ============
Basic earnings per share of common stock................                                          $(0.84)
                                                                                                  ======
Assume exercise of common stock equivalents:
  Weighted average shares of common stock outstanding...      25,753,738

  (Anti-dilutive common stock equivalents are not used
  in this calculation)

$5.40 employee stock options............................          32,366
Director stock options..................................           2,851
                                                             -----------    ------------  
                                                              25,788,955    $(21,539,000)
                                                             ===========    ============ 
Primary earnings per share of common stock..............                                          $(0.84)
                                                                                                  ======
Assume no conversion of anti-dilutive convertible
preferred stock

Assume exercise of common stock equivalents:
  Weighted average shares of common stock outstanding...      25,753,738

  (Anti-dilutive common stock equivalents are not 
  used in this calculation)

$5.40 employee stock options............................          30,817
Director stock options..................................           1,620
                                                             -----------    ------------  
                                                              25,786,175    $(21,539,000)
                                                             ===========    ============               
Fully diluted earnings per share of common stock........                                          $(0.84) 
                                                                                                  ======
</TABLE>

                                                                    Exhibit 11.1

<PAGE>
 
                  SUBSIDIARIES OF WESTERN GAS RESOURCES, INC.

                                        
NAME OF SUBSIDIARY                               RELATIONSHIP
- ------------------                               ------------
<TABLE>
<CAPTION>
<S> <C>                                          <C>
1)  MIGC, Inc.                                   Wholly-owned subsidiary of Western Gas Resources, Inc.
    
2)  MGTC, Inc.                                   Wholly-owned subsidiary of MIGC, Inc.
    
3)  Western Gas Resources - Texas, Inc.          Wholly-owned subsidiary of Western Gas Resources, Inc.
    
4)  Williston Gas Company                        50%-owned joint venture of Western Gas Resources, Inc.
    
5)  Western Gas Resources Storage, Inc.          Wholly-owned subsidiary of Western Gas Resources, Inc.
    
6)  Centre Court Travel, Inc.                    Wholly-owned subsidiary of Western Gas Resources, Inc.
    
7)  Rising Star Pipeline Corporation             Wholly-owned subsidiary of Western Gas Resources, Inc.
    
8)  Setting Sun Pipeline Corporation             Wholly-owned subsidiary of Western Gas Resources, Inc.
    
9)  Western Gas Resources - Louisiana, Inc.      Wholly-owned subsidiary of Western Gas Resources, Inc.
    
10) Western Gas Resources - Oklahoma, Inc.       Wholly-owned subsidiary of Western Gas Resources, Inc.
    
11) Westana Gathering Company                    A general partnership with Western Gas Resources, Inc.
                                                 as general partner
    
12) Mountain Gas Resources, Inc.                 Wholly-owned subsidiary of Western Gas Resources, Inc.
    
13) Mountain Gas Transportation, Inc.            Wholly-owned subsidiary of Mountain Gas Resources, Inc.
    
14) Green River Gathering Company                A general partnership between Western Gas Resources, Inc.
                                                 and Mountain Gas Resources, Inc.
    
15) Western Power Services, Inc.                 Wholly-owned subsidiary of Western Gas Resources, Inc.
</TABLE>

                                                                    Exhibit 21.1

<PAGE>
 
                       Consent of Independent Accountants



We hereby consent to the incorporation by reference in the Prospectus
constituting part of the Registration Statements on Form S-3 (No.33-66516, No.
33-54741and No. 333-00903) and in the Registration Statement on Form S-8 (No.
33-67834) of Western Gas Resources, Inc. of our report dated February 23, 1996
appearing on page 27 of this Form 10-K.



PRICE WATERHOUSE LLP

Denver, Colorado
March 22, 1996

                                                                    Exhibit 23.1

<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 5
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1995
<PERIOD-END>                               DEC-31-1995
<CASH>                                           5,795
<SECURITIES>                                         0
<RECEIVABLES>                                  204,426
<ALLOWANCES>                                         0
<INVENTORY>                                     30,581
<CURRENT-ASSETS>                               242,326
<PP&E>                                       1,049,806
<DEPRECIATION>                               (200,203)
<TOTAL-ASSETS>                               1,193,997
<CURRENT-LIABILITIES>                          297,615
<BONDS>                                        454,500
                                0
                                        416
<COMMON>                                         2,580
<OTHER-SE>                                     368,913
<TOTAL-LIABILITY-AND-EQUITY>                 1,193,997
<SALES>                                      1,249,517
<TOTAL-REVENUES>                             1,256,984
<CGS>                                        1,040,265
<TOTAL-COSTS>                                1,040,265
<OTHER-EXPENSES>                               187,825
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              37,160
<INCOME-PRETAX>                                (8,266)
<INCOME-TAX>                                   (2,158)
<INCOME-CONTINUING>                            (6,108)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   (6,108)
<EPS-PRIMARY>                                    (.84)
<EPS-DILUTED>                                    (.84)
        

</TABLE>


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