MARKWEST HYDROCARBON INC
10-Q, 1997-11-13
NATURAL GAS DISTRIBUTION
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                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                   FORM 10-Q

[X]    QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d)
            OF THE SECURITIES EXCHANGE ACT OF 1934
                                        
               FOR THE QUARTERLY PERIOD ENDED SEPTEMBER 30, 1997
                                        
                                       OR

[ ]    TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
                        SECURITIES EXCHANGE ACT OF 1934
                                        
           FOR THE TRANSITION PERIOD FROM ___________  TO ___________

                         COMMISSION FILE NUMBER 1-11566

                           MARKWEST HYDROCARBON, INC. 
            (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

          DELAWARE                                     84-1352233
(State or other jurisdiction of                     (I.R.S. Employer
incorporation or organization)                     Identification No.)

                                        
         155 INVERNESS DRIVE WEST, SUITE 200, ENGLEWOOD, CO  80112-5004
                    (Address of principal executive offices)

       REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE:  303-290-8700

                                        

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 registrant had 8,479,101 shares of common stock, $.01 per share par value,
outstanding as of November 10, 1997.

================================================================================
<PAGE>
=============================================================================== 
<TABLE> 
<CAPTION> 
 
 
 
 
 
PART I - FINANCIAL INFORMATION                                                          Page
                                                                                -------------------
<S>                                                                               <C> 
Item 1.  Consolidated Financial Statements

            Consolidated Balance Sheet at September 30, 1997 and 
             December 31, 1996.............................................              1
 
            Consolidated Statement of Operations for the Three and
             Nine Months Ended September 30, 1997 and 1996.................              2
 
            Consolidated Statement of Cash Flows for the Three and Nine 
             Months Ended September 30, 1997 and 1996......................              3
 
            Notes to the Consolidated Financial Statements.................              4
 
Item 2.  Management's Discussion and Analysis of Financial Condition and
            Results of Operations..........................................              6
 
 
PART II - OTHER INFORMATION
 
Item 1.  Legal Proceedings.................................................             13
Item 6.  Exhibits and Reports on Form 8-K..................................             13
 
SIGNATURES.................................................................             14
</TABLE>
<PAGE>
 
PART I - FINANCIAL INFORMATION
Item 1.  Consolidated Financial Statements

                           MARKWEST HYDROCARBON, INC.
                           CONSOLIDATED BALANCE SHEET
                           (000S, EXCEPT SHARE DATA)
<TABLE>
<CAPTION>
                                                                             September 30,
                                                                                  1997         December 31,
                                  ASSETS                                      (Unaudited)          1996
                                                                           --------------------------------
Current assets:
<S>                                                                          <C>               <C>
    Cash and cash equivalents..............................................      $      --         $  4,401
    Receivables............................................................          8,749            9,755
    Inventories............................................................          7,419            5,632
    Prepaid feedstock......................................................          3,098            1,831
    Other assets...........................................................            498              458
                                                                               -----------       ----------
       Total current assets................................................         19,764           22,077
 
Property and equipment:
    Gas processing, gathering, storage and marketing equipment.............         48,027           46,416
    Oil and gas properties and equipment...................................          7,205            3,731
    Land, buildings and other equipment....................................          9,250            4,478
    Construction in progress...............................................         13,044            5,831
                                                                               -----------       ----------
                                                                                    77,526           60,456
    Less: accumulated depreciation, depletion and amortization.............        (14,619)         (12,316)
                                                                               -----------       ----------
       Total property and equipment, net...................................         62,907           48,140
 
Intangible assets, net of accumulated amortization of $276
    and $315 respectively..................................................            500              380
Note receivable and other assets...........................................          9,938            7,657
                                                                               -----------       ----------
Total assets...............................................................       $ 93,109         $ 78,254
                                                                               ===========       ==========
                   LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
    Trade accounts payable.................................................       $  1,937         $  5,382
    Accrued liabilities....................................................          4,625            4,643
    Current portion of long-term debt......................................            156              156
                                                                               -----------       ----------
       Total current liabilities...........................................          6,718           10,181
 
Long-term debt.............................................................         22,969           11,257
Deferred income taxes......................................................          5,175            3,977
 
Minority interest..........................................................          9,113            9,175
 
Stockholders' equity:
    Preferred stock, par value $0.01, 5,000,000 shares authorized, 0
     shares issued and outstanding.........................................             --               --
    Common stock, par value $0.01, 20,000,000 shares authorized, 8,510,173
     shares issued, 8,485,268 shares outstanding...........................             85               85
    Additional paid-in capital.............................................         42,582           42,237
    Retained earnings......................................................          6,792            1,342
    Treasury stock.........................................................           (325)              --
                                                                               -----------       ----------
               Total stockholders' equity..................................         49,134           43,664
                                                                               -----------       ----------
Total liabilities and stockholders' equity.................................       $ 93,109         $ 78,254
                                                                               ===========       ==========
</TABLE>

  The accompanying notes are an integral part of these financial statements.


                                       1
<PAGE>
 
                           MARKWEST HYDROCARBON, INC.
                      CONSOLIDATED STATEMENT OF OPERATIONS
                                  (UNAUDITED)
                         (000S, EXCEPT PER SHARE DATA)

<TABLE>
<CAPTION>
                                                           For the three months ended                   For the nine months ended
                                                                 September 30,                                September 30,
                                                              1997                 1996                 1997                 1996
                                                       ---------------      ----------------     ----------------     --------------
<S>                                                    <C>                  <C>                  <C>                  <C>
Revenues:
    Appalachia plant revenue......................          $ 9,560               $10,543              $39,847              $28,876
    Terminal and marketing revenue................            2,650                 3,976               10,930               13,798
    Michigan transportation and treating revenue..            2,103                    --                3,344                   --
    Oil and gas revenue...........................              425                    74                  695                  237
    Interest income...............................               65                    26                  406                   69
    Other income..................................              210                   342                  508                  643
                                                       ---------------      ----------------     ----------------     --------------
 
          Total revenue...........................           15,013                14,961               55,730               43,623
                                                       ---------------      ----------------     ----------------     --------------
 
Costs and expenses:
    Appalachia feedstock purchases................            4,664                 5,882               19,225               14,420
    Terminal and marketing purchases..............            2,393                 3,372               10,879               12,055
    Michigan feedstock purchases..................            1,036                    --                1,036                   --
    Operating expenses............................            2,849                 1,365                7,605                4,216
    General and administrative expenses...........            1,636                 1,238                5,467                3,507
    Depreciation, depletion and amortization......              825                   783                2,408                2,111
    Interest expense, net of capitalized interest.              395                   378                  726                  887
                                                       ---------------      ----------------     ----------------     --------------
 
          Total costs and expenses................           13,798                13,018               47,346               37,196
                                                       ---------------      ----------------     ----------------     --------------
 
Income before minority interest and income taxes..            1,215                 1,943                8,384                6,427
 
Minority interest in net loss of subsidiary.......               30                    --                  252                   --
                                                       ---------------      ----------------     ----------------     --------------
 
Income before income taxes........................            1,245                 1,943                8,636                6,427
 
Provision for income taxes:
    Current.......................................             (544)                   --                2,001                   --
    Deferred......................................              922                    --                1,185                   --
                                                       ---------------      ----------------     ----------------     --------------
                                                                378                    --                3,186                   --
                                                       ---------------      ----------------     ----------------     --------------
 
Net income........................................          $   867               $ 1,943              $ 5,450              $ 6,427
                                                       ===============      ================     ================     ==============
 
Earnings per share of common stock (A)............            $0.10                 $0.15                $0.64                $0.50
                                                       ===============      ================     ================     ==============
Weighted average number of outstanding shares of
 common stock (A).................................            8,485                 7,908                8,485                7,908
                                                       ===============      ================     ================     ==============
 
Pro forma net income (Note 4)
    Historical income before income taxes.........             N/A                $ 1,943                 N/A               $ 6,427
    Provision for income taxes....................             N/A                    738                 N/A                 2,442
                                                                             ---------------                          --------------

    Net income....................................             N/A                $ 1,205                N/A                $ 3,985
                                                                            ================                          ==============
</TABLE>
(A)  Pro forma for 1996 (see Note 4).

  The accompanying notes are an integral part of these financial statements.

                                       2
<PAGE>
 
                           MARKWEST HYDROCARBON, INC.
                      CONSOLIDATED STATEMENT OF CASH FLOWS
                                  (UNAUDITED)
                                     (000S)
<TABLE>
<CAPTION>
                                                                       For the three months                 For the nine months
                                                                        ended September 30,                  ended September 30,
                                                                   1997                1996                1997             1996
                                                               --------------      --------------      --------------   -----------
<S>                                                              <C>                 <C>                 <C>               <C>
Reconciliation of net income to net cash provided by
 operating activities:
     Net income............................................        $   867             $ 1,943            $  5,450         $  6,427
     Add income items that do not affect working capital:
        Depreciation, depletion and amortization...........            825                 783               2,408            2,111
        Deferred income taxes..............................            922                  --               1,185               --
        Gain on sale of assets.............................             --                  --                 (75)              --
                                                               --------------      --------------      --------------      ---------
 
                                                                     2,614               2,726               8,968            8,538
                                                               --------------      --------------      --------------      ---------
     Adjustments to working capital:
         (Increase) decrease in accounts receivable........           (187)             (1,432)              1,006            3,686
         (Increase) in inventories.........................         (4,499)             (3,443)             (1,787)          (4,174)
         (Increase) in prepaid feedstock and other assets..         (1,447)             (1,323)             (1,307)          (1,735)
         (Decrease) increase in accounts payable and
          accrued liabilities..............................           (958)                205              (4,523)           1,128
                                                               --------------      --------------      --------------      ---------

                                                                    (7,091)             (5,993)             (6,611)          (1,095)
                                                               --------------      --------------      --------------      ---------
 
            Net cash (used in) provided by operating
             activities....................................         (4,477)             (3,267)              2,357            7,443
 
Cash flows from investing activities:
         Capital expenditures..............................         (8,450)               (960)            (16,170)          (2,902)
         Increase in intangible assets,  note receivable
          and other assets.................................           (513)             (1,748)             (2,401)          (2,336)
 
         Other.............................................            206                  --                  62               --
                                                               --------------      --------------      --------------      ---------

             Net cash used in investing activities.........         (8,757)             (2,708)            (18,509)          (5,238)
 
Cash flows from financing activities:
         Proceeds from long-term debt......................         13,000               8,790              22,920           13,640
         Repayment of long-term debt.......................            (57)                 --             (11,207)         (10,000)
         Partners' distributions...........................             --                (973)                 --           (4,192)
         Other.............................................            105                (158)                 38             (158)
                                                               --------------      --------------      --------------      ---------
 
             Net cash provided by (used in) financing
              activities...................................         13,048               7,659              11,751             (710)
                                                               --------------      --------------      --------------      ---------

Net (decrease) increase in cash and cash equivalents.......           (186)              1,684              (4,401)           1,495
 
Cash and cash equivalents at beginning of period...........            186                 572               4,401              761
                                                               --------------      --------------      --------------      ---------

Cash and cash equivalents at end of period.................    $        --             $ 2,256           $      --          $ 2,256
                                                               ==============      ==============      ==============      =========
</TABLE>

  The accompanying notes are an integral part of these financial statements.


                                       3
<PAGE>
 
NOTE 1.  GENERAL

The consolidated financial statements include the accounts of MarkWest
Hydrocarbon, Inc. ("MarkWest" or the "Company") and its wholly-owned
subsidiaries, MarkWest Resources, Inc. ("Resources") and MarkWest Michigan, Inc.
("Michigan").  All significant intercompany accounts and transactions have been
eliminated in consolidation.

The unaudited financial statements presented herein have been prepared in
accordance with the instructions to Form 10-Q and do not include all the
information and note disclosures required by generally accepted accounting
principles for complete financial statements. The interim consolidated financial
statements should be read in conjunction with the Consolidated Financial
Statements and Notes thereto for the year ended December 31, 1996 included in
the Company's Form 10-K, as filed with the Securities and Exchange Commission.
In the opinion of management, all adjustments necessary for a fair statement of
the results for the unaudited interim periods have been made.  These adjustments
consist only of normal recurring adjustments.

The effective corporate tax rate for interim periods is based on the estimated
annual effective corporate tax rate, excluding certain nonrecurring or unusual
events.  The effective tax rate varies from statutory rates due primarily to tax
credits and intangible development costs.

Certain prior year amounts have been reclassified to conform to the 1997
presentation.

NOTE 2.  REORGANIZATION

The Company was incorporated in June 1996 to act as the successor to MarkWest
Hydrocarbon Partners, Ltd. (the "Partnership").  Effective October 7, 1996, the
Partnership reorganized (the "Reorganization") and the existing general and
limited partners exchanged 100% of their interests in the Partnership for
5,725,000 common shares of the Company.  An additional 2,400,000 shares of
common stock were offered for public sale, totaling 8,125,000 shares outstanding
as of October 15, 1996.  The over-allotment of 360,000 shares was also exercised
during October, resulting in a total of 8,485,000 shares outstanding at October
31, 1996.  This transaction was a reorganization of entities under common
control, and accordingly, it was accounted for at historical cost.

NOTE 3.  SIGNIFICANT BUSINESS ACQUISITIONS

Prior to July 1, 1996, the Partnership owned 49% of MarkWest Coalseam
Development Company LLC (formerly MarkWest Coalseam Joint Venture) ("Coalseam"),
a natural gas development venture, and MW Gathering LLC ("Gathering"), a natural
gas gathering venture.  Effective July 1, 1996, Gathering was merged into
Coalseam.  Simultaneously, the Partnership formed MarkWest Resources Inc.
("Resources"), and Coalseam distributed 49% of its assets to Resources and 51%
to MAK-J Energy Partners, Ltd. (formerly MarkWest Energy Partners, Ltd.), a
partnership whose general partner is a corporation owned and controlled by the
President of the Company.  The consolidated financial statements reflect
Resources' 49% proportionate share of the underlying oil and gas assets,
liabilities, revenues and expenses.

Effective May 6, 1996, the Partnership acquired the right to earn up to a 60%
interest for $16.8 million in a newly formed venture, West Shore Processing, LLC
("West Shore").  The most significant asset of West Shore is Basin Pipeline LLC,
which was contributed by the Partnership's venture partner, Michigan Energy
Company, LLC.  The West Shore agreement is structured so that the Company's
ownership interest increases as capital expenditures for the benefit of West
Shore are made by the Company.  The Company completed its earn-in of a 60%
interest in the venture in the second quarter of 1997, through the funding of
capital expenditures totaling approximately $16.8 million.

NOTE 4.  PRO FORMA INFORMATION

Prior to the Reorganization, the Company was organized as a partnership and
consequently, was not subject to income tax.   A pro forma provision for income
taxes and pro forma net income for the three and nine months ended 

                                       4

<PAGE>
 
September 30, 1996 have been presented for purposes of comparability as if the
Company had been a taxable entity. In addition, the Company's historical capital
structure is not indicative of its current structure and, accordingly,
historical net income per common share has not been presented. Pro forma net
income per common share for the three and nine months ended September 30, 1996
has been computed using the weighted average number of common and common
equivalent shares outstanding for the fourth quarter of 1996 following the
Company's initial public offering.

NOTE 5.  LONG TERM DEBT

Effective June 20, 1997, the Company replaced its existing financing agreements
with a new credit facility (the "credit facility") with the Bank of Montreal, as
agent, NationsBank and Colorado National Bank.  The credit facility allows the
Company to borrow up to $55 million pursuant to a  revolving loan commitment.
The revolving loan commitment converts to a reducing loan commitment on May 31,
1999.  The reducing loan commitment reduces ratably on a quarterly basis to zero
by May 31, 2003.

Interest rates are based on either the agent bank's prime rate plus 1% or the
London Interbank Offered Rate (LIBOR), plus an applicable margin of between 50
and 150 basis points, based upon the Company's debt to capitalization ratio.  As
of September 30, 1997, approximately $22.9 million was outstanding.  Of the
total debt outstanding, $18.9 million bears interest at 6.125% and $4.0 million
bears interest at 6.185%.

The debt is secured by a first mortgage on the Company's major assets.  The loan
agreement restricts certain activities and requires the maintenance of certain
financial ratios and other conditions.

As a direct result of entering into a new credit facility, the Company wrote off
previously deferred financing costs associated with the previous credit facility
of approximately $235,000 in the second quarter of 1997.

NOTE 6.  RECENT ACCOUNTING PRONOUNCEMENTS

In February 1997, the Financial Accounting Standards Board issued Statement No.
128 ("SFAS 128"), "Earnings Per Share".  This Statement is effective for
financial statements issued for periods ending after December 15, 1997.  Earlier
adoption is not permitted.  SFAS 128 requires dual presentation of basic and
diluted EPS for entities with complex capital structures.  The impact of
adopting SFAS 128 will not have a material effect on the Company's earnings per
share calculation.

                                       5
<PAGE>
 
ITEM 2.   MANAGEMENT'S DISCUSSION AND ANALYSIS OF  FINANCIAL CONDITION AND
RESULTS OF OPERATIONS

Management's Discussion and Analysis of Financial Condition and Results of
Operations includes forward-looking statements (within the meaning of Section
21E of the Securities Exchange Act of 1934) reflecting the expectations, plans
and objectives of management for operations of the Company.  Such statements are
based on current expectations that involve numerous risks and uncertainties.
Assumptions relating to these expectations involve judgments with respect to,
among other things, future drilling success in the vicinity of the company's
Michigan operations and future economic, competitive and market conditions,
including the price of propane, other natural gas liquids and natural gas, all
of which are difficult or impossible to predict accurately and many of which are
beyond the control of the Company.  Accordingly, there can be no assurance that
the forward-looking statements included in the Form 10-Q will prove to be
accurate.  Inclusion of such information should not be regarded as a
representation by the Company or any other person that the expectations, plans
and objectives of the Company will be realized.

GENERAL

MarkWest Hydrocarbon, Inc. ("MarkWest" or the "Company") provides compression,
gathering, treatment, processing and natural gas liquids ("NGL") extraction
services to natural gas producers and pipeline companies and fractionates NGLs
into marketable products for sale to third parties.  The Company also purchases,
stores and markets natural gas and NGLs.  Historically, the majority of the
Company's operating income has been derived from gas processing, NGL
fractionation and NGL sales in its Appalachia core area.  In the near future, an
increasing portion of the Company's revenues is expected to be derived from
transportation and treating revenues from the Company's Michigan operations, as
production volumes and throughput in Michigan are expected to grow significantly
beginning in the second half of 1998 (see further discussion below under
"Michigan").  In its Appalachia core area, NGL prices and the volume of liquids
extracted, fractionated, and sold are the primary determinants of revenues.
Prices of NGLs typically do not vary directly with natural gas prices, but more
closely follow the prices of crude oil.  In addition to sales of NGLs processed
by the Company, the Company generates income from the purchase and resale of
NGLs as part of its terminal and marketing activities, and provides marketing
activities in support of its company-owned facilities and production.  The
Company also currently operates two propane terminals.

A significant portion of the Company's revenues are derived from the sale of
natural gas liquids, particularly propane.  The strongest demand for propane and
the highest propane sales margins generally occur during the winter heating
season.  As a result, the Company realizes the greatest proportion of its annual
income during the first and fourth quarters of the year.

APPALACHIA

As previously announced, in April 1997, the Federal Energy Regulatory Commission
approved Columbia Gas Transmission Corporation's rate case.  As part of this
rate case, MarkWest and Columbia signed a letter agreement ("the Agreement")
which will allow the Company to acquire and operate two additional facilities
from Columbia, the Boldman and Cobb NGL Extraction plants.  Boldman is currently
owned by MarkWest and leased to and operated by Columbia. Cobb will be acquired
and operated by MarkWest.  Implementation of the Agreement began during the
second quarter.  Definitive agreements are in progress, and MarkWest began
contracting for processing services directly with producers in June 1997.

Upon completion, the financial impact of this transaction for MarkWest will be
that the term of NGLs committed to Siloam from these facilities will be extended
from 2003 to 2009, and the arrangement will provide the opportunity to target
potential NGL production increases at these facilities.  Studies have begun to
evaluate either upgrading or replacing the Cobb facility.

NGL production at MarkWest's Siloam Plant in Kentucky remained about constant at
26.4 million gallons for the third quarter, compared to the same quarter in
1996.   Sales volumes of  NGLs for the third quarter decreased 12 percent to
20.9 million gallons, compared to the same period in 1996.  In 1996, a cold
winter started early in the 

                                       6

<PAGE>
 
heating season, increasing demand and prices for propane. Several other factors
influenced third quarter 1997 results. Lower sales volumes were offset by
increased processing fee revenue. The impact of lower propane prices was more
than offset by favorably priced advanced purchases of natural gas. Third quarter
results also reflect lower terminal sales volumes.

MICHIGAN

Gas volumes through MarkWest's 60-percent-owned sour gas pipeline and plant in
western Michigan more than tripled to 12.8 million cubic feet per day (mmcfd) in
the third quarter. This volume, increased through another company's gas well
completed late in the second quarter of 1997, is up from the 3.9 mmcfd reported
in 1996.  A third company announced two new discoveries in the third quarter of
1997, with a combined flow rate of 15 mmcfd, and announced plans to drill four
more prospects in 1998.  These well results, combined with a pending application
with the Michigan Public Service Commission to extend the pipeline, are causing
increased drilling activity and acreage acquisitions in the area.  The Company's
new natural gas liquids plant is expected to start up operations in the fourth
quarter of 1997, and will allow the Company to sell propane and other liquids
directly into higher-priced markets.

In addition, two 3-D seismic programs were completed this year with drilling
expected to begin in the fourth quarter.  MarkWest has a 17.5 percent working
interest in the first program, which covers 27 square miles.  The second program
covers 50 square miles.  Drilling success resulting from these programs could
add significantly to pipeline and NGL throughput in 1998.

MarkWest plans to extend the pipeline and connect it to these wells, other shut-
in wells and future wells to be drilled in 1998.  Pipeline route selection and
permitting activities for this extension are underway.  As a result of these
developments, the Company commenced detailed studies to expand the capacity in
the pipeline and NGL plant to 50 mmcfd from 35 mmcfd.

OUTLOOK

It is expected that the results from the fourth quarter of 1997 and the first
quarter of 1998 will reflect more normal price levels when compared to the near
record-high price levels experienced in the fourth quarter of 1996 and the first
quarter of 1997.  Propane prices rose dramatically in the fourth quarter of 1996
due to an early cold start to the winter and a Mexican plant explosion, which
had a detrimental impact on imported propane volumes into the United States.
The Company was able to extend the benefit from these high price levels by
entering into various hedge contracts which positively affected the Company's
results in the first quarter of 1997.

As of the end of the third quarter of 1997, the Company has entered into various
hedge contracts for the upcoming fourth quarter which lock in natural gas prices
in Appalachia on 65% of the Company's expected purchases.  These hedge contracts
are expected to limit the Company's risk of price fluctuations for its natural
gas purchases throughout the fourth quarter of 1997.   However, a significant
portion of the Company's revenues, and as a result, its gross margins, remain
dependent upon the sales price of propane, which fluctuates with the winter
weather conditions and other supply and demand determinants.   Currently,
MarkWest has an annual sensitivity to NGL prices equal to $1.0 million in pretax
income for every $0.01/gallon change in NGL prices and an annual sensitivity to
natural gas prices equal to $1.0  million in pretax income for every $0.10/mmbtu
change in natural gas prices.  As of the end of the third quarter, the Company
has not entered into significant hedge contracts for its expected natural gas
purchases in the first quarter of 1998 and beyond.  As a result, the Company
will be subject to price risk on both natural gas and propane prices in the
first quarter of 1998 and beyond.

The Company's future results are expected to be positively affected by volumes
through MarkWest's 60-percent-owned sour gas pipeline and plant in Western
Michigan which more than tripled to 12.8 mmcfd in the third quarter of 1997.
This increase in volumes due to significant drilling success in the area,
together with the start up of the Company's new natural gas liquids plant
expected in the fourth quarter of 1997, is expected to add substantial
production volumes and related revenues as described above.

                                       7
<PAGE>
 
<TABLE>
<CAPTION>
                                                 THREE MONTHS ENDED                     NINE MONTHS ENDED
                                                    SEPTEMBER 30,                         SEPTEMBER 30,
OPERATING STATISTICS                               1997        1996      % CHANGE      1997        1996      % CHANGE
                                              ----------------------------------------------------------------------
 
<S>                                             <C>         <C>         <C>         <C>         <C>         <C>
Fee gas processed (mmbtu)                       13,667,349   8,663,134        58%   41,039,676  22,485,510        83%
NGL production - Siloam plant (gallons)         26,440,651  26,265,662         1%   76,318,338  69,359,365        10%
NGLs marketed - Siloam plant (gallons)          20,851,267  23,648,355       (12%)  70,721,011  64,250,073        10%
Terminal throughput (gallons)                    5,842,224   6,257,409        (6%)  19,127,090  24,694,593       (22%)
Michigan pipeline throughput (mcf)               1,175,060     359,343       227%    2,018,408     780,841       158%
Gas production (mcf)                               133,253      26,950       394%      309,887      77,376       300%
</TABLE>

  THREE MONTHS ENDED SEPTEMBER 30, 1997 COMPARED TO THE THREE MONTHS ENDED
  SEPTEMBER 30, 1996

  The Company reported net income of $867,000 or $0.10 per share on revenues of
  $15.0 million for the third quarter of 1997. This compares to pro forma net
  income of $1.2 million or $0.15 per share on revenues of $15.0 million for the
  same period in 1996. Net income for the three months ended September 30, 1997
  decreased primarily due to reduced gross margins from the Company's Appalachia
  terminals, as a result of warmer weather during the third quarter of 1997
  compared to the third quarter of 1996, reducing volumes sold.

  GROSS MARGIN ANALYSIS (IN MILLIONS)

<TABLE>
<CAPTION>
  APPALACHIA PLANTS                            1997           1996          Variance         Volume          Price
                                         -----------------------------------------------------------------------------
 
<S>                                        <C>            <C>            <C>             <C>             <C>
     Plant revenue                              $ 9.6          $10.5          $(0.9)          $(0.6)          $(0.3)
     Feedstock costs                              4.7            5.9            1.2             0.7             0.5
                                         -----------------------------------------------------------------------------
     Gross margin                               $ 4.9          $ 4.6          $ 0.3           $ 0.1           $ 0.2
                                         =============================================================================
</TABLE>

  The Company's third quarter 1997 Appalachia plant revenues decreased from the
  third quarter of 1996, primarily due to a 12% decrease in sales volumes during
  the quarter. The decrease in volumes can be attributed to the Company's
  efforts to build the necessary inventory levels for the upcoming winter
  heating season. The remaining decrease is due to more normal propane price
  levels in 1997 compared to above average price levels in the previous year.

  Appalachia plant feedstock costs decreased in the third quarter of 1997 as
  compared to the third quarter of 1996, primarily due to lower NGL sales
  volumes. The remaining variance was due to a decrease in unit prices in the
  third quarter of 1997 from the same quarter in 1996, primarily as a result of
  favorably priced advance purchases of natural gas in 1997.

<TABLE>
<CAPTION>
  APPALACHIA TERMINALS                         1997           1996          Variance         Volume          Price
                                         -----------------------------------------------------------------------------
 
<S>                                        <C>            <C>            <C>             <C>             <C>
     Terminal and marketing revenue             $ 2.7          $ 4.0          $(1.3)          $(1.2)          $(0.1)
     Terminal and marketing purchases             2.4            3.4            1.0             1.0              --
                                         -----------------------------------------------------------------------------
     Gross margin                               $ 0.3          $ 0.6          $(0.3)          $(0.2)          $(0.1)
                                         =============================================================================
</TABLE>

  Terminal and marketing revenue for the third quarter of 1997 decreased
  primarily as a result of a 6% volume decrease caused by the warm weather
  experienced in the third quarter of 1997, compared to the cold early start to
  winter experienced in the same quarter in 1996, and due to the lack of non-
  terminal sales in 1997.

  The Company's third quarter 1997 terminal and marketing purchases decreased
  from the same quarter in 1996 as a result of the volume decrease.

                                       8
<PAGE>
 
<TABLE>
<CAPTION>
MICHIGAN                                       1997           1996         Variance
                                         ---------------------------------------------
<S>                                        <C>            <C>            <C>
     Transportation and treatment revenue       $2.1             $ --          $2.1
     Feedstock purchases                         1.0               --           1.0
                                         ---------------------------------------------
     Gross margin                               $1.1             $ --          $1.1
                                         =============================================
</TABLE>

At September 30, 1996, the Company had earned an 11.3% interest in the Michigan
project, which was accounted for under the equity method of accounting.
Accordingly, the Company's respective share of income in the Michigan project,
which was approximately $169,000 for the third quarter of 1996, was reflected in
other income during 1996.   Michigan transportation and treatment revenue and
feedstock purchases increased for the third quarter of 1997, reflecting higher
1997 volumes as described above. The Company incurs operating expenses, general
and administrative costs and interest expense on debt funding the capital
program, all as described below.

OIL AND GAS REVENUE

Oil and gas revenue increased to $425,000 for the third quarter of 1997 as
compared to $74,000 for the third quarter of 1996, an increase of $351,000. Gas
production from all of the Company's properties during the three months ended
September 30, 1997  increased 400% from the three months ended September 30,
1996, reflecting new production from the Company's capital program.

COSTS AND EXPENSES

Operating expenses increased $1.4 million to $2.8 million for the third quarter
of 1997, as compared to the third quarter of 1996. The increase was principally
driven by the Company's new operations in Michigan, which commenced in May 1996.
 
General and administrative expenses increased $400,000 to $1.6 million for the
third quarter of 1997 from $1.2 million for the third quarter of 1996.   The
increase was attributable to administrative support activities related to the
new operations in Michigan and to costs incurred in connection with being a
public company in 1997.

NINE MONTHS ENDED SEPTEMBER 30, 1997 COMPARED TO THE NINE MONTHS ENDED SEPTEMBER
30, 1996

The Company reported net income of $5.5 million or $0.64 per share on revenues
of $55.7 million for the nine months ended September 30, 1997.  This compares to
pro forma net income of $4.0 million or $0.50 per share on revenues of $43.6
million for the same period in 1996.  Net income for the nine months ended
September 30, 1997 increased primarily due to increased sales margins and
volumes at the Company's Siloam plant during the first two quarters of 1997.
This was partially offset by a decrease in sales margins and volumes at the
Company's Appalachia terminals for the nine months ended September 30, 1997, as
compared to the nine months ended September 30, 1996.

GROSS MARGIN ANALYSIS (IN MILLIONS)

<TABLE> 
<CAPTION>
APPALACHIA PLANTS                              1997           1996          Variance         Volume          Price
                                         -----------------------------------------------------------------------------
 
<S>                                           <C>            <C>            <C>             <C>             <C>
     Plant revenue                                 $39.8          $28.9          $10.9           $ 3.1           $ 7.8
     Feedstock costs                                19.2           14.4           (4.8)           (1.4)           (3.4)
                                         -----------------------------------------------------------------------------
     Gross margin                                  $20.6          $14.5          $ 6.1           $ 1.7           $ 4.4
                                         =============================================================================
</TABLE>

The Company's Appalachia plant revenues for the nine months ended September 30,
1997 increased primarily as a result of higher sales prices for NGLs compared
with the same period in 1996, as a result of the factors described in "Outlook"
above.   The remaining increase was caused by a 10% increase in NGL sales
volumes during the first nine months of 1997 compared to the first nine months
of 1996.

                                       9
<PAGE>
 
Appalachia plant feedstock costs increased for the nine months ended September
30, 1997, compared to plant feedstock for the same period in 1996 primarily as a
result of higher natural gas prices during the first nine months of
1997.  The remaining increase in feedstock costs was related to higher NGL
production and sales volumes in the first nine months of 1997, compared to the
first nine months of 1996.

<TABLE>
<CAPTION>
APPALACHIA TERMINALS                           1997           1996          Variance         Volume          Price
                                         -----------------------------------------------------------------------------
 
<S>                                           <C>            <C>            <C>             <C>             <C>
     Terminal and marketing revenue                $10.9          $13.8          $(2.9)          $(2.7)          $(0.2)
     Terminal and marketing purchases               10.9           12.1            1.2             2.3            (1.1)
                                         -----------------------------------------------------------------------------
     Gross margin                                  $  --          $ 1.7          $(1.7)          $(0.4)          $(1.3)
                                         =============================================================================
</TABLE>

Terminal results in 1997 have been adversely affected by two factors.  First,
beginning in the fourth quarter of 1996, there was a significant appreciation in
propane prices as described above in "Outlook".   As a result, the Company
entered 1997 with higher-than-normally priced propane inventories.  The first
quarter of 1997 saw sales prices decline rapidly as the supply and demand
characteristics returned to normal levels.  Second, weather has been warmer in
1997, resulting lower sales volumes during the nine months ended September 30,
1997.

<TABLE>
<CAPTION>
MICHIGAN                                       1997            1996         Variance
                                         ----------------------------------------------
 
<S>                                        <C>            <C>             <C>
     Transportation and treatment revenue          $ 3.3           $  --           $3.3
     Feedstock purchases                             1.0              --            1.0
                                         ----------------------------------------------
     Gross margin                                  $ 2.3           $  --           $2.3
                                         ==============================================
</TABLE>

At September 30, 1996, the Company had earned an 11.3% interest in the Michigan
project, which was accounted for under the equity method of accounting.
Accordingly, the Company's respective share of income in the Michigan project,
which was approximately $169,000 for the nine months ended September 30, 1996,
was reflected in other income during 1996.  Michigan transportation and treating
revenue and feedstock purchases increased for the nine months ended September
30, 1997,  reflecting higher 1997 volumes as described above.  The Company
incurs operating expenses, general and administrative costs and interest expense
on debt funding the capital program, all as described below.

OIL AND GAS REVENUE

Oil and gas revenue increased to $695,000 for the nine months ended September
30, 1997 compared to $237,000 for the nine months ended September 30, 1996, an
increase of $458,000.  Gas production from all of the Company's properties
during the nine months ended September 30, 1997 increased 300% from the previous
year, reflecting new production from the Company's capital program.

INTEREST INCOME

Interest income increased $337,000, to $406,000 for the nine months ended
September 30, 1997, compared to interest income of $69,000 for the nine months
ended September 30, 1996.  This increase resulted primarily from interest income
earned in the first six months of 1997 on the long-term note receivable, which
earned interest at a rate of 5.98%.

COSTS AND EXPENSES

Operating expenses increased $3.4 million, or 81%, to $7.6 million for the nine
months ended September 30, 1997 as compared to operating expenses of $4.2
million for the nine months ended September 30, 1996.  The increase was
principally driven by the Company's operations in Michigan, which commenced in
May 1996.

                                       10
<PAGE>
 
General and administrative expenses increased $2.0 million to $5.5 million for
the nine months ended September 30, 1997, compared to general and administrative
expenses of $3.5 million for the nine months ended September 30, 1996.  This
increase was attributable to administrative support activities related to the
new operations in Michigan and to costs incurred in connection with being a
public company in 1997.

Depreciation and amortization increased approximately $300,000, or 14%, to $2.4
million for the nine months ended September 30, 1997, compared to depreciation
and amortization expense of $2.1 million for the same period in 1996.  This
increase was principally due to increased depreciation attributable to the
Company's new Michigan operations.

INTEREST EXPENSE

Interest expense decreased $161,000 to $726,000 for the nine months ended
September 30, 1997, compared to interest expense of $887,000 for the same period
in 1996, primarily as a result of the lower cost of the Company's new credit
facility (see further discussion below under "Liquidity and Capital Resources").

LIQUIDITY AND CAPITAL RESOURCES

The Company's sources of liquidity and capital resources historically have been
net cash provided by operating activities; proceeds from issuance of long-term
debt; and in 1996, an initial public offering of equity.  The Company's
principal uses of cash have been to fund operations, capital expenditures and
acquisitions.

For the nine months ended September 30, 1997,  net cash flow provided from
operations, before adjustments for working capital, increased to $9.0 million
from $8.5 million for the nine months ended September 30, 1996.    The Company
invested $6.6 million in working capital in the nine months ended September 30,
1997, compared to $1.1 million invested in the nine months ended September 30,
1996.  This  was primarily caused by a higher accounts receivable balance at
September 30, 1997 related to the Company's Michigan operations and a decrease
in 1997 in accounts payable and accrued liabilities, primarily related to tax
payments made in 1997, offset by a smaller build in inventories for the nine
months ended September 30, 1997 when compared to the same time period in 1996.

Cash used in investing activities increased $13.3 million for the nine months
ended September 30, 1997  to $18.5 million, as compared to cash used in
investing activities of $5.2 million for the nine months ended September 30,
1996, mainly due to $16.2 million of capital expenditures funded by the Company
during the first three quarters of 1997.    The Company's 1997 capital program
is discussed further below.

Financing activities during the third quarter of both 1997 and 1996 principally
consisted of borrowings and repayments on long-term debt.

Financing Facilities

New Credit Facility  Effective June 20, 1997, the Company replaced its existing
financing agreement with a new credit facility (the "credit facility") with the
Bank of Montreal, as agent, NationsBank and Colorado National Bank.  The credit
facility allows the Company to borrow up to $55 million, subject to borrowing
base calculations, pursuant to a revolving loan commitment.   The revolving loan
commitment converts to a reducing loan commitment on May 31, 1999.  The reducing
loan commitment reduces ratably on a quarterly basis to zero by May 21, 2003.

Interest rates are based on either the agent bank's prime rate plus 1% or the
London Interbank Offered Rate (LIBOR), plus an applicable margin of between 50
and 150 basis points, based upon the Company's debt to capitalization ratio.  As
of September 30, 1997, approximately $22.9 million was outstanding. Of the total
debt outstanding, $18.9 million bears interest at 6.125% and $4.0 million bears
interest at 6.185%.

                                       11
<PAGE>
 
The loan agreement contains affirmative and negative covenants customary in
commercial lending transactions, including maintenance of a specified tangible
net worth, ratio of total funded debt to capitalization, total funded debt to
trailing twelve month EBITDA and current ratio.

Resources Revolver Loan  The Company had a revolving facility with Colorado
National Bank with a maximum borrowing base of $5.8 million as of March 31,
1997.  This facility was canceled by the Company, effective April 25, 1997.

At September 30, 1997, the Company had $32.1 million of available credit and
working capital of $13.0 million.  The Company believes that cash flows
generated by its operations and existing credit facilities will be sufficient to
meet its anticipated cash needs for working capital and capital expenditures,
other than acquisitions, if any, for the next 12 months.

Capital Investment Program

On July 1, 1997, the Company closed on the purchase of a 44,000 square-foot
office building in Englewood, Colorado, with the objective of reducing the
Company's effective office costs.  The four year old building will serve as
MarkWest's corporate headquarters.  MarkWest will occupy approximately half of
the building and lease out the remainder. The cost of the building and tenant
improvements will total approximately $5.6 million, to be financed initially
from the Company's line of credit, and to be converted to long-term financing
later in 1997.  Of the total cost, $4.6 million has been expended in the nine
months ended September 30, 1997.

In addition, the Company expects to spend approximately $17.0 million during
1997, including approximately $10.0 million in the Michigan Core Area in order
to complete construction of a pipeline and a new liquids facility, with the
balance being allocated for projects in the Appalachian Core Area and
exploration projects. For the nine months ended September 30, 1997, the Company
made capital expenditures totaling approximately $11.6 million.

RISK MANAGEMENT ACTIVITIES

The Company's primary hedging objectives are to meet or exceed budgeted gross
margins by locking in budgeted or above-budgeted prices in the financial
derivatives markets and to protect margins from precipitous declines. The
Company maintains a three-person committee of senior management that oversees
all hedging activity.

MarkWest employs three general risk management strategies.  First, the Company
contracts for future purchases of natural gas at a predetermined BTU
differential based upon a basket of Gulf Coast NGL prices (or a substitute for
propane such as crude oil).  Second, MarkWest protects margins by purchasing
natural gas contracts while simultaneously selling propane contracts of
approximately the same BTU value.  Third, the Company purchases propane futures
contracts to hedge future sales of propane at the Company's terminals or gas
plants.

MarkWest enters into futures transactions in two ways:  (1) on the New York
Mercantile Exchange ("NYMEX"); and (2) future gas purchases are negotiated with
natural gas suppliers and are structured to provide similar risk protections as
NYMEX futures.

Gains and loss related to qualifying hedges, as defined by Statement of
Financial Accounting Standards No. 80, "Accounting for Futures Contracts", of
firm commitments or anticipated transactions are recognized in plant revenue and
feedstock purchases upon execution of the hedged physical transaction.  Under
internal guidelines, speculative transactions are prohibited.

In addition to these risk management tools, MarkWest is able to use its liquids
storage facilities to inventory product during lower-priced periods for resale
during higher-priced periods.  Also, MarkWest has contractual arrangements to
purchase certain quantities of its natural gas feedstock in advance of physical
needs.

During the three and nine months ended September 30, 1997, a $0 and $1.0 million
gain, respectively, were recognized in operating income on the settlement of
propane and natural gas futures, compared to gains of $36,000 

                                       12

<PAGE>
 
and $107,000 recognized during the three and nine months ended September 30,
1996, respectively. Financial instrument gains and losses on hedging activities
were generally offset by amounts realized from the sale of the underlying
products in the physical market.

RECENT ACCOUNTING PRONOUNCEMENTS

In February 1997, the Financial Accounting Standards Board issued Statement No.
128 ("SFAS 128"), "Earnings Per Share".  This Statement is effective for
financial statements issued for periods ending after December 15, 1997.  Earlier
adoption is not permitted.  SFAS 128 requires dual presentation of basic and
diluted EPS for entities with
complex capital structures.  The impact of adopting SFAS 128 will not have a
material effect on the Company's earnings per share calculation.

PART II.   OTHER INFORMATION

ITEM 1.  LEGAL PROCEEDINGS

In April 1997, Domain Energy Corporation and EnCap Investments, L.C. informed
the Company that they had purported to transfer their interests in Michigan
Energy Company, LLC ("MEC") and Michigan Production Company to Energy
Acquisition Corp.  MEC holds a minority interest in West Shore. In April 1997,
the Company commenced arbitration proceedings pursuant to the Participation,
Ownership and Operating Agreement for West Shore, to challenge the transfer of
the interest in MEC.

The arbitration demand also asserted claims involving certain West Shore
operating issues generated by MEC's actions subsequent to the challenged
transfer.  Domain Energy Corporation, EnCap Investments, L.C. and other entities
participating in the transfer transaction, named as Respondents in the
arbitration, subsequently filed an action in Harris County, Texas seeking a
declaration that the transfer transaction was proper and challenging the
arbitrability of the Company's claims concerning the transfer. The Texas State
Court action also sought an issuance of an injunction against the arbitration
proceeding during the pendency of the declaratory judgment action.

To facilitate prompt resolution of the West Shore operating issue claims
initially asserted in the arbitration and additional issues which have arisen
since April, the Company amended the arbitration demand in July 1997 to
withdraw, without prejudice, its challenge to the transfer transaction. The
Company believes the transfer issue will be resolved by alternative means.

On October 16, 1997, the Harris County Texas Court entered a notice of intent to
dismiss the Domain action, discussed above, for want of prosecution.

ITEM 6.  EXHIBITS AND REPORTS ON FORM 8-K

(a)   Exhibits

         10.1  MarkWest Hydrocarbon, Inc. 1997 Severance Plan

         27 -  Financial Data Schedule
 
(b)   Reports on Form 8-K

         No reports on Form 8-K were filed during the quarter ended September
30, 1997.

                                       13
<PAGE>
 
                                   SIGNATURES
                                        
Pursuant to the requirements 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.


                                        MarkWest Hydrocarbon, Inc.
                                               (Registrant)



 
Date:   November 12, 1997          By: /s/ Gerald A. Tywoniuk
                                       --------------------------------
                                             Gerald A. Tywoniuk
                                       Chief Financial Officer and Vice
                                            President of Finance
                                      (On Behalf of the Registrant and
                                        as Principal Financial and
                                            Accounting Officer)

                                       14

<PAGE>
                                                                    EXHIBIT 10.1

                           MARKWEST HYDROCARBON, INC.
                              1997 SEVERANCE PLAN



          Section 1.  Purpose.
                      ------- 

          MarkWest Hydrocarbon, Inc. has adopted this 1997 Severance Plan (the
"Plan") for the purpose of providing a financial incentive for certain employees
of MarkWest Hydrocarbon, Inc. and its subsidiaries (collectively the "Company")
and to enable the Company to retain such employees and to attract other well-
qualified candidates.

          Section 2.  Effective Date.
                      -------------- 

          The Plan shall be effective as of July 2, 1997.

          Section 3.  Definitions.
                      ----------- 

          As used in the Plan, the following terms shall have the meanings set
forth below:

          (a) "Base Salary" shall mean the Covered Employee's annualized base
salary at the time that such employee's employment with the Company terminates.

          (b) "Board of Directors" shall mean the Board of Directors of MarkWest
Hydrocarbon, Inc.

          (c) "Cause" shall mean (1) the conviction of a Covered Employee of any
act constituting a felony under the laws of any state or of the United States,
or a crime involving moral turpitude that causes harm to the Company, (2)
willful misconduct by a Covered Employee causing material harm to the Company,
(3) substantial and material failure to perform required duties which is not
cured within 30 days after receiving written notice from the Company describing
the failure to perform and stating that the Company will consider the
continuation of such failure to perform as cause for termination, or (4) any of
the reasons for termination of employment by the Company set forth in the
Company's employee handbook, as may be amended from time to time.

          (d) "COBRA" shall mean the Consolidated Omnibus Budget Reconciliation
Act of 1985, as amended.

          (e) "COBRA Benefits" shall mean the payment by the Company on behalf
of an Eligible Employee of insurance premiums necessary to continue such

<PAGE>
 
employee's health insurance coverage under the Company's insurance plan
following the termination of his or her employment with the Company pursuant to
COBRA; provided, however, that the term "COBRA Benefits" shall not include any
payments resulting from an increase in insurance premiums due to the provision
of health insurance to the spouse or any dependents of the Eligible Employee to
the extent that such dependents were not covered by the Company's health
insurance policy on the date that such employee's employment with the Company
terminated. In addition, the term COBRA Benefits shall include the payment by
the Company on behalf of any Three Year Eligible Employee who is an Executive
Officer and a Director, pursuant to Section 4(b)(1) of the Plan, of insurance
premiums necessary to continue such employee's health insurance coverage under
the Company's insurance plan following the termination of his or her employment
with the Company beyond the term required by COBRA.

          (f) "Company" shall mean MarkWest Hydrocarbon, Inc., a Delaware
corporation, and all of its subsidiaries.  For this purpose, a subsidiary shall
mean any entity in an unbroken chain of entities beginning with MarkWest
Hydrocarbon, Inc. if each of the entities other than the last entity in the
unbroken chain holds an ownership interest representing 50 percent or more of
the total combined voting power of all classes of ownership interest in one of
the other entities in such chain.

          (g) "Covered Employee" shall mean any executive officer of the Company
or any other key employee of the Company designated by the Chief Executive
Officer and the Chief Operating Officer of MarkWest Hydrocarbon, Inc., in their
sole discretion, as being covered by the Plan.

          (h) "Director" shall mean a Covered Employee that is a member of the
Board of Directors of MarkWest Hydrocarbon, Inc.

          (i) "Disability" shall mean the termination of the Covered Employee's
employment due to mental or physical disability, such disability being
determined by a competent medical authority acceptable to the Company.

          (j) "Eligible Employee" shall mean a Covered Employee that is either a
One Year Eligible Employee or a Three Year Eligible Employee.

          (k) "Executive Officer" shall mean a Covered Employee that the Board
of Directors determines to be an executive officer of the Company.

          (l) "Good Reason" shall mean (1) a material reduction in a Covered
Employee's duties or functions from those that such an officer or key employee
would normally perform or that the Covered Employee had been performing or (2) a
change in control of the Company of a nature that would be required to be

                                      -2-
<PAGE>
 
reported in response to Item 6(e) of Schedule 14A of Regulation 14A promulgated
under the Securities Exchange Act of 1934, as amended, whether or not the
Company is then subject to such reporting requirements; provided, however, that,
in either case, the Company has not cured the events constituting Good Reason
within 10 days after receiving written notice from the Covered Employee
describing such Good Reason.

          (m) "Incentive Compensation Plan" shall mean the MarkWest Hydrocarbon,
Inc. 1996 Incentive Compensation Plan, as amended.

          (n) "Minimum Covenant Period" shall mean the greater of (i) eighteen
(18) months or (ii) the Severance Period.

          (o) "One Year Eligible Employee" shall mean a Covered Employee that
has been employed by the Company for a consecutive period of at least one (1)
year but less than three (3) years.

          (p) "Plan" shall mean the MarkWest Hydrocarbon, Inc. 1997 Severance
Plan as set forth herein.

          (q) "Severance Payments" shall mean any payments made pursuant to
Section 4 of the Plan.

          (r) "Severance Period" shall mean the time period during which an
Eligible Employee receives Severance Payments.

          (s) "Stock Incentive Plan" shall mean the MarkWest Hydrocarbon, Inc.
1996 Stock Incentive Plan, as amended.

          (t) "Three Year Eligible Employee" shall mean a Covered Employee that
has been employed by the Company for a consecutive period of at least three (3)
years.

          Section 4.  Severance Payments.
                      ------------------ 

          (a) Eligibility.  No person shall be eligible to receive any Severance
Payments under the Plan unless such person is an Eligible Employee at the time
of termination of his or her employment with the Company.  No employee shall be
considered a participant under the Plan until such time as their employment
terminates under circumstances that  entitle him or her to Severance Payments
under Plan, and such participation shall end when all Severance Payments such
employee may be entitled to receive have been paid.

                                      -3-
<PAGE>
 
          (b) Termination Without Cause or Resignation for Good Reason.  If an
Eligible Employee resigns for Good Reason or such employee's employment with the
Company is terminated without Cause, the Eligible Employee shall be entitled to
receive Severance Payments from the Company in accordance with the following
schedule:

              (i)   any Three Year Eligible Employee that is both an Executive
Officer and a Director shall be entitled to receive Base Salary and COBRA
Benefits for a period of twenty-four (24) months; provided, however, that the
payment by the Company of COBRA Benefits beyond the period during which the
Company is required to provide insurance coverage to such employee pursuant to
COBRA shall be subject to approval by the Company's insurance carrier.

              (ii)  any One Year Eligible Employee that is both an Executive
Officer and a Director shall be entitled to receive Base Salary and COBRA
Benefits for a period of twelve (12) months;

              (iii) any Three Year Eligible Employee that is an Executive
Officer, but not a Director, shall be entitled to receive Base Salary and COBRA
Benefits for a period of eighteen (18) months;

              (iv)  any One Year Eligible Employee that is an Executive Officer,
but not a Director, shall be entitled to receive Base Salary and COBRA Benefits
for a period of nine (9) months;

              (v)   any Three Year Eligible Employee that is neither an
Executive Officer nor a Director shall be entitled to receive Base Salary and
COBRA Benefits for a period of twelve (12) months; and

              (vi)  any One Year Eligible Employee that is neither an Executive
Officer nor a Director shall be entitled to receive Base Salary and COBRA
Benefits for a period of six (6) months.

          (c) Disability.  If an Eligible Employee's employment with the Company
is terminated by reason of such employee's death or Disability, the Eligible
Employee (or his or her representative) shall be entitled to receive the same
Severance Payments that such employee would have been entitled to receive if the
Eligible Employee resigned for Good Reason or such employee's employment with
the Company was terminated without Cause.

          (d) Voluntary Resignation.  If an Eligible Employee voluntarily
resigns, the Eligible Employee shall be entitled to receive Severance Payments
from the Company in accordance with the following schedule:

                                      -4-
<PAGE>
 
              (i)    any Three Year Eligible Employee that is both an Executive
Officer and a Director shall be entitled to receive Base Salary and COBRA
Benefits for a period of six (6) months;

              (ii)   any One Year Eligible Employee that is both an Executive
Officer and a Director shall be entitled to receive Base Salary and COBRA
Benefits for a period of three (3) months;

              (iii)  any Three Year Eligible Employee that is an Executive
Officer, but not a Director, shall be entitled to receive Base Salary and COBRA
Benefits for a period of four (4) months and two (2) weeks;

              (iv)   any One Year Eligible Employee that is an Executive
Officer, but not a Director, shall be entitled to receive Base Salary and COBRA
Benefits for a period of two (2) months and one (1) week;

              (v)    any Three Year Eligible Employee that is neither an
Executive Officer nor a Director shall be entitled to receive Base Salary and
COBRA Benefits for a period of three (3) months; and

              (vi)   any One Year Eligible Employee that is neither an Executive
Officer nor a Director shall be entitled to receive Base Salary and COBRA
Benefits for a period of one (1) month and two (2) weeks.

          (e) Termination for Cause.  If the Company terminates the employment
of an Eligible Employee for Cause, such employee shall not be entitled to
receive any Severance Payments.

          (f) Limitations on Amount of Severance Payments. Notwithstanding any
provision to the contrary in any other portion of the Plan, the aggregate amount
of Severance Payments to be paid to an Eligible Employee shall in no event
exceed twice such employee's annual compensation during the year immediately
preceding the termination of his or her employment with the Company.  Annual
compensation for purposes of determining the foregoing limitation means the
total compensation, including wages, salary, bonus and any other benefit of
monetary value, whether paid in the form of cash or otherwise, which was paid as
consideration for the Eligible Employee's services during the year, or which
should have been so paid at such employee's usual rate and compensation if such
employee had been employed by the Company for the entire year.  To the extent
that a Severance Payment would exceed the foregoing limitation, payment under
the Plan shall be modified.

          (g) Limitations on COBRA Benefits.  The payment by the Company of
COBRA Benefits to an Eligible Employee pursuant to this Section 4 shall only

                                      -5-
<PAGE>
 
commence upon a proper election by such employee to receive insurance coverage
pursuant to COBRA and shall cease immediately if, at any time thereafter, such
employee becomes covered by another health insurance plan or otherwise becomes
ineligible to receive coverage pursuant to COBRA.  Such payments shall in no
event extend the period of time during which such employee is eligible to
receive coverage under the Company's health insurance plan pursuant to COBRA.
Notwithstanding the foregoing, the Company will pay COBRA Benefits beyond the
period during which the Company is required to provide insurance coverage
pursuant to COBRA to a Three Year Eligible Employee who is an Executive Officer
and a Director in accordance with Section 4(b)(1) of the Plan, subject to the
approval of the Company's insurance carrier.

          (h) Termination of Service Period.  Regardless of whether an Eligible
Employee receives Severance Payments pursuant to the Plan following the
termination of his or her employment with the Company, such person shall not be
considered an employee of the Company for any purpose following such
termination.  The receipt of Severance Payments following the termination of
employment shall in no event extend the vesting period of any awards granted to
an Eligible Employee pursuant to the Stock Incentive Plan or make such person
eligible to receive bonus payments from the Company pursuant to the Incentive
Compensation Plan, or otherwise, for any period after the termination of such
person's employment with the Company.

          (i) Method of Payment.  All Severance Payments shall be paid in
accordance with the Company's normal payroll policies over the course of the
Severance Period.  All Severance Payments are subject to any required
withholding. In no event shall Severance Payments be made beyond twenty-four
(24) months after the termination of the Eligible Employee's employment with the
Company.  To the extent that Severance Payments are to be made after the death
of the Eligible Employee, payment will be made to the personal representative of
such employee's estate or, if there is no estate, in accordance with applicable
law.

          Section 5.  Non-Competition, Non-Solicitation and Confidentiality
                      -----------------------------------------------------
Agreement.
- --------- 

          Notwithstanding any provision to the contrary in any other portion of
the Plan, no Eligible Employee shall be entitled to receive any Severance
Payments pursuant to the Plan unless such employee is party to an effective and
legally enforceable agreement with the Company pursuant to which he or she is
bound to covenants of non-competition, non-solicitation and confidentiality for
the time period commencing on the termination of his or her employment with the
Company and continuing for a period of time no less than the Minimum Covenant
Period.  Such covenants shall be upon such terms and provisions as the Company
may determine in its sole discretion, provided that the covenant of non-

                                      -6-
<PAGE>
 
competition shall be limited to the geographic regions in which the Company
conducts its business at the time that the Eligible Employee's employment with
the Company is terminated.  In addition, no Covered Employee shall be eligible
for any further awards under the Stock Incentive Plan unless such employee is
party to an effective and legally enforceable agreement containing the terms and
provisions described above.

          Section 6.  Waiver and Release.
                      ------------------ 

          Notwithstanding any provision to the contrary in any other portion of
the Plan, no Eligible Employee shall be entitled to receive any Severance
Payments pursuant to the Plan until such employee has executed and delivered (i)
an agreement with the Company prospectively waiving any employment-related
claims that he or she may have against the Company and (ii) a release, releasing
the Company from any such claims.

          Section 7.  Claims Procedure.
                      ---------------- 

          (a) General.  If a Covered Employee believes that he or she may be
entitled to benefits, or the Covered Employee is in disagreement with any
determination that has been made with respect to the Plan, the Covered Employee
may present a claim to the Company.

          (b) Making a Claim.  A Covered Employee's claim must be written and
must be delivered to the Company.  Within ninety (90) days after delivery of
such claim, the Covered Employee shall receive either:  (i) a decision; or (ii)
a notice describing special circumstances requiring a specified amount of
additional time (but no more than one hundred and eighty (180) days from the
date of delivery of such claim) to reach a decision.  If such claim is wholly or
partially denied, the Covered Employee shall receive a written notice
specifying:  (i) the reasons for denial; (ii) the Plan provisions on which such
denial is based; and (iii) any additional information needed from the Covered
Employee in connection with the claim and the reason such information is needed.
The Covered Employee shall also receive a written statement providing the
information contained in Section 7(c) below concerning the Covered Employee's
right to request a review.

          (c) Requesting Review of a Denied Claim.  A Covered Employee may
request that a denied claim be reviewed.  Such request for review must be
written and must be delivered to the Company within sixty (60) days after the
Covered Employee receives the written notice that the Covered Employee's claim
was denied.  Such request for review may (but is not required to) include issues
and comments that the Covered Employee wants considered in the review.  The
Covered Employee may examine pertinent Plan documents by making a request to the
Company.  Within sixty (60) days after delivery by the Covered Employee of the

                                      -7-
<PAGE>
 
Covered Employee's request for review, the Company shall receive either:  (i) a
decision; or (ii) a notice describing special circumstances requiring a
specified amount of additional time (but no more than one hundred and twenty
(120) days from the date of delivery of such request for review) to reach a
decision.  The decision shall be in writing and shall specify the Plan
provisions on which it is based.

          (d) Decisions.  All decisions on claims and on reviews of denied
claims will be made by the Company.  The Company may, in its sole discretion,
hold one or more hearings.  If a Covered Employee does not receive a decision
within the specified time, the Covered Employee should assume that the claim was
denied or re-denied on the date the specified time expired.  The Company
reserves the right to delegate, in whole or in part, its authority to make
decisions under the Plan.

          Section 8.  Miscellaneous.
                      ------------- 

          (a) Amendment, Suspension or Termination.  The Board of Directors may,
from time to time and at any time, amend, suspend or terminate, in whole or in
part, any or all of the provisions of the Plan; provided, however, that no such
action shall adversely affect the right of any Eligible Employee with respect to
any Severance Payment he or she may have become entitled to hereunder prior to
the effective date of such amendment, suspension, or termination.

          (b) Determinations.  The Company shall make such determinations as may
be required from time to time in the administration of the Plan.  The Company
shall have the sole discretion, authority and responsibility to interpret and
construe the Plan and to determine all factual and legal questions under the
Plan, including, without limitation, all questions regarding the entitlement of
employees of the Company to participate in the Plan and the amount of any
benefits they may be eligible to receive thereunder.

          (c) Limitations.  This Plan is not to be construed as constituting a
contract of employment.  Nothing contained herein shall affect or impair the
Company's right to terminate the employment of a Covered Employee.  All
Severance Payments shall be paid out of the general funds of the Company.  An
Eligible Employee shall not have any secured or preferred interest by way of a
trust, escrow, lien or otherwise in any specific asset of the Company for any
unpaid Severance Payments.  The Company will not make any contributions to fund
the Plan.

          (d) Indemnification.  No member of the Board of Directors or employee
of the Company shall have any liability for any decision or action if made or
done in good faith, nor for any error or miscalculation unless such error or
miscalculation is a result of fraud, deliberate disregard of the terms of the
Plan, or 

                                      -8-
<PAGE>
 
gross neglect. The Company shall indemnify each such director or employee acting
in good faith, pursuant to the terms of the Plan, against any loss or expense
arising therefrom.

          (e) Spendthrift Provisions.  No Covered Employee shall have any
transmissible interest in the Plan nor shall any Covered Employee have any power
to anticipate, alienate, dispose of, pledge or encumber any rights under the
Plan, nor shall the Company recognize any assignment thereof, either in whole or
in part, nor shall the Plan or any Severance Payments be subject to attachment,
garnishment, execution following judgment or other legal process.

          (f) Plan Administrator.  The Company shall be the  administrator of
the Plan.

          (g) Service of Legal Process.  The Secretary of the Company is
designated as the appropriate and exclusive agent for the receipt of service of
process directed to the Plan in any legal proceeding involving the Plan.

          (h) Type of Plan.  The Plan is a severance pay employee welfare
benefit plan.  The Plan is not an employee pension benefit plan.

          (i) Governing law.  The terms of this Plan shall, except to the extent
that federal law controls, be governed by and construed in accordance with the
laws of the State of Colorado.

                                      -9-

<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONSOLIDATED BALANCE SHEET AND CONSOLIDATED STATEMENTS OF OPERATIONS ON PAGES 1
AND 2OF THE COMPANY'S 1997 FORM 10-Q FOR THE THREE MONTHS ENDED SEPTEMBER 30,
1997, AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL
STATEMENTS.
</LEGEND>
       
<S>                                        <C>
<PERIOD-TYPE>                                    9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-END>                               SEP-30-1997
<CASH>                                               0 
<SECURITIES>                                         0
<RECEIVABLES>                                    8,749
<ALLOWANCES>                                         0 
<INVENTORY>                                      7,419
<CURRENT-ASSETS>                                19,764
<PP&E>                                          77,526
<DEPRECIATION>                                (14,619)
<TOTAL-ASSETS>                                  93,109
<CURRENT-LIABILITIES>                            6,718
<BONDS>                                         23,125
                                0
                                          0
<COMMON>                                            85
<OTHER-SE>                                      49,049
<TOTAL-LIABILITY-AND-EQUITY>                    93,109
<SALES>                                         54,121
<TOTAL-REVENUES>                                55,730
<CGS>                                           31,140
<TOTAL-COSTS>                                   31,140
<OTHER-EXPENSES>                                16,206
<LOSS-PROVISION>                                     0  
<INTEREST-EXPENSE>                                 726
<INCOME-PRETAX>                                  8,636
<INCOME-TAX>                                     3,186
<INCOME-CONTINUING>                              5,450
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     5,450
<EPS-PRIMARY>                                     0.64
<EPS-DILUTED>                                        0
        

</TABLE>


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