HS RESOURCES INC
POS EX, 1997-10-10
CRUDE PETROLEUM & NATURAL GAS
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<PAGE>   1

   
    AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON OCTOBER 10, 1997
    
                                                      REGISTRATION NO. 333-28825
================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549 

                           ------------------------

   
                         POST-EFFECTIVE AMENDMENT NO. 1
    
                                       TO
                                    FORM S-3
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933

                           ------------------------

                               HS RESOURCES, INC.
             (Exact name of registrant as specified in its charter)

              Delaware                                 94-3036864
   (State or other jurisdiction of                  (I.R.S. Employer
   incorporation or organization)                Identification Number)

                               ONE MARITIME PLAZA
                                   15TH FLOOR
                        SAN FRANCISCO, CALIFORNIA 94111
                                 (415) 433-5795
  (Address, including zip code, and telephone number, including area code, of
                   registrant's principal executive office)
                             JAMES M. PICCONE, ESQ.
                                GENERAL COUNSEL
                               HS RESOURCES, INC.
                           1999 BROADWAY, SUITE 3600
                            DENVER, COLORADO  80202
                                 (303) 296-3600
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)

                           ------------------------


           It is requested that copies of communications be sent to:

                           RONALD R. LEVINE, II, ESQ.
                           DAVIS, GRAHAM & STUBBS LLP
                       370 SEVENTEENTH STREET, SUITE 4700
                            DENVER, COLORADO  80202
                                 (303) 892-9400   

                           ------------------------

          APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO PUBLIC:
   From time to time after the effective date of this Registration Statement.

     If the only securities being registered on this Form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box.  [ ]

     If any of the securities being registered on this Form are to be offered
on a delayed or continuous basis pursuant to Rule 415 under the Securities Act
of 1933, check the following box.   [X]

     If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following
box and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering.   [ ]

     If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering.   [ ]

     If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box.   [ ]


                           ------------------------





<PAGE>   2
                        CALCULATION OF REGISTRATION FEE
<TABLE>
<CAPTION>
                                                                                                                         
=========================================================================================================================
                                                              Proposed         Proposed
                                                Amount         maximum          maximum
      Title of each class of                     to be     offering price      aggregate           Amount of
   securities to be registered                registered     per unit(1)   offering price(1)   registration fee(1)
- -------------------------------------------------------------------------------------------------------------------------
<S>                                           <C>               <C>           <C>                   <C>
Common Stock, par value $.001 per share       2,864,225         $14.50        $41.531,263           $12,586
=========================================================================================================================
</TABLE>

(1)  Estimated solely for the purpose of calculating the registration fee
     pursuant to Rule 457(c). Based upon the average of the high and low prices
     reported by The New York Stock Exchange on June 5, 1997. This fee was
     previously paid by the Registrant.

                           ------------------------




<PAGE>   3
                                    PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS


ITEM 16.  EXHIBITS


Exhibit
Number                     Description of Exhibits

   
1.1*                       Underwriting Agreement dated October 9, 1997 by and 
                           among HS Resources, Inc., Orion Acquisition, Inc.,
                           HSRTW, Inc., HS Energy Services, Inc., Natural Gas
                           Partners, L.P., Lehman Brothers Inc., Merrill Lynch &
                           Co. and Petrie Parkman & Co.
    

3.1                        Amended and Restated Certificate of Incorporation of
                           the Company.  (Incorporated herein by reference to
                           Exhibit 3.1 to the Company's Registration Statement
                           on Form S-1, No. 33-52774, filed October 2, 1992.)

3.2                        Third Amended and Restated Bylaws of the Company
                           adopted December 16, 1996. (Incorporated herein by
                           reference to Exhibit 3.2 to the Company's
                           Registration Statement on Form S-4, No.  333-19433,
                           filed January 8, 1997.)

4.1                        Form of Indenture dated December 1, 1993, entered
                           into between the Company and the Trustee.
                           (Incorporated by reference to Exhibit 4.7 to
                           Amendment No. 3 to the Company's Registration
                           Statement on Form S-3, No. 33-70354, filed November
                           23, 1993.)

4.2                        Indenture dated November 27, 1996, among the
                           Company, Orion Acquisition, Inc., HSRTW, Inc., and
                           Harris Trust and Savings Bank as Trustee.
                           (Incorporated herein by reference to Exhibit 4.2 to
                           the Company's Registration Statement on Form S-4,
                           No. 333-19433, filed January 8, 1997.)

4.3                        First Supplemental Indenture dated November 25, 1996
                           among the Company, Orion Acquisition, Inc., HSRTW,
                           Inc., and Harris Trust and Savings Bank as Trustee.
                           (Incorporated herein by reference to Exhibit 4.3 to
                           the Company's Registration Statement on Form S-4,
                           No. 333-19433, filed January 8, 1997.)

4.4+                       Registration Rights Agreement between the Company
                           and Natural Gas Partners, L.P. dated June 17, 1996.

   
5.1+                       Opinion of Davis, Graham & Stubbs LLP
    

10.1                       Amended Note and Warrant Purchase Agreement dated
                           January 15, 1991, among NGP, Resolute Resources,
                           Inc., and the Company.  (Incorporated by reference
                           to Exhibit 4.4.1 to the Company's Quarterly Report
                           on Form 10-Q for the quarter ended December 31,
                           1990, filed February 14, 1991.)

10.1.1                     Amendment No. 1 to Note and Warrant Purchase
                           Agreement dated June 28, 1991, between the Company
                           and NGP.  (Incorporated by reference to Exhibit
                           4.4.2 to the Company's Annual Report on Form 10-K
                           for the fiscal year ended June 30, 1991, filed
                           September 30, 1991.)

10.1.2                     Second Amendment to Note and Warrant Purchase
                           Agreement dated August 17, 1992, between the Company
                           and NGP.  (Incorporated by reference to Exhibit
                           4.2.2 to Amendment No. 2 to the Company's
                           Registration Statement on Form S-1, No. 33-52774,
                           filed November 19, 1992.)

10.1.3                     Third Amendment to Note and Warrant Purchase
                           Agreement dated October 21, 1993, between the
                           Company and NGP.  (Incorporated by reference to
                           Exhibit 4.1.3 to Amendment





                                      II-1
<PAGE>   4
                           No. 2 to the Company's Registration Statement on
                           Form S-3, No. 33-70354, filed November 23, 1993.)

10.2                       Amended and Restated Warrant Agreement dated January
                           15, 1991, between NGP and the Company.
                           (Incorporated by reference to Exhibit 4.5.1 to the
                           Company's Quarterly Report on Form 10-Q for the
                           quarter ended December 31, 1990, filed February 14,
                           1991.)

10.3                       Amended Warrant No. W-1, dated January 15, 1991, and
                           issued by the Company to NGP.  (Incorporated by
                           reference to Exhibit 4.6.1 to the Form 8, Second
                           Amendment to Form 10, filed April 8, 1991.)

10.3.1                     Amendment No. 1 to Amended Warrant No. W-1, dated
                           December 30, 1991, and issued by the Company to NGP.
                           (Incorporated by reference to Exhibit 4.6.2 to the
                           Company's Quarterly Report on Form 10-Q for the
                           quarter ended December 31, 1991, filed on February
                           14, 1991.)

10.4                       Form of Warrant No. W-10, dated January 28, 1992,
                           and issued by the Company to NGP.  (Incorporated by
                           reference to Exhibit 4.16 to Amendment No. 1 to the
                           Company's Registration Statement on Form S-1, No.
                           33-52774, filed November 9, 1992.)

10.5                       1987 Stock Incentive Plan, as amended December 2,
                           1996.  (Incorporated by reference to Exhibit 10.5 to
                           the Company's Annual Report on Form 10-K for the
                           fiscal year ended December 31, 1996, filed March 19,
                           1997.)

10.6                       Common Stock Purchase Warrant dated July 12, 1990 by
                           the Company to James E. Duffy.  (Incorporated by
                           reference to Exhibit 10.5 to the Form 8, Second
                           Amendment to Form 10, filed April 8, 1991.)

10.7                       HS Resources, Inc. Rule 701 Compensatory Benefit
                           Plan. (Incorporated by reference to Exhibit 10.5.2
                           to the Form 8, Second Amendment to Form 10 filed
                           April 8, 1991.)

10.8                       1992 Directors' Stock Option Plan.  (Incorporated by
                           reference to Exhibit 10.10 to Amendment No. 1 to the
                           Company's Registration Statement on Form S-1, No.
                           33-52774, filed November 9, 1992.)

10.8.1                     1993 Directors' Stock Option Plan.  (Incorporated by
                           reference to Exhibit 10.8.1 to the Company's Annual
                           Report on Form 10-K for the fiscal year ended
                           December 31, 1993, filed March 31, 1994 (as amended
                           by Form 10-K/A-1 on April 8, 1994.))

10.9                       Form of Indemnification Agreement for Directors of
                           the Company.  (Incorporated by reference to Exhibit
                           10.16 to the Company's Annual Report on Form 10-K
                           for the fiscal year ended December 31, 1995, filed
                           March 25, 1996.)

10.10                      Lease Agreement dated October 6, 1993, between the
                           Company and JMB Group Trust IV and Endowment and
                           Foundation Realty, Ltd.--JMB III for the premises at
                           One Maritime Plaza, San Francisco, California.
                           (Incorporated by reference to Exhibit 10.13 to the
                           Company's Annual Report on Form 10-K for the fiscal
                           year ended December 31, 1993, filed March 31, 1994
                           (as amended by Form 10-K/A-1 on April 8, 1994.))

10.11                      Lease Agreement dated March 28, 1994, between the
                           Company and 1999 Broadway Partnership for the
                           premises at 1999 Broadway, Denver, Colorado.
                           (Incorporated by reference to Exhibit 10.15 to the
                           Company's Quarterly Report on Form 10-Q for the
                           quarter ended June 30, 1994, filed August 12, 1994.)





                                      II-2
<PAGE>   5
10.12                      Interest exchange agreement between The Chase
                           Manhattan Bank, N.A. and the Company dated May 9,
                           1995.  (Incorporated by reference to Exhibit 10.19
                           to the Company's Quarterly Report on Form 10-Q for
                           the quarter ended June 30, 1995, filed August 14,
                           1995.)

10.13                      Amended and Restated Agreement and Plan of Merger,
                           dated as of April 29, 1996, among the Company, HSR
                           Acquisition, Inc. and Tide West Oil Co.
                           (Incorporated by reference as Annex A to Amendment
                           No. 2 to the Company's Registration Statement on
                           Form S-4, No. 333-01991, filed on May 2, 1996.)

10.14                      Agreement for Purchase and Sale of Assets
                           [Monetization], dated as of February 24, 1996, among
                           the Company, Basin Exploration, Inc. ("Basin") and
                           Orion Acquisition, Inc.  (Incorporated by reference 
                           to Exhibit 2.3 to the Company's Form 8-K, filed 
                           March 12, 1996.)

10.15                      Agreement for Purchase and Sale of Assets
                           [Wattenberg], dated as of February 24, 1996, among
                           the Company, Orion Acquisition, Inc. and Basin.  
                           (Incorporated by reference to Exhibit A to the 
                           Company's Schedule 13D relating to Basin 
                           Exploration, Inc. filed on March 6, 1996.)

10.16                      Purchase and Sale Agreement, dated December 1, 1995,
                           between the Company and Wattenberg Gas Investments,
                           LLC.  (Incorporated by reference to Exhibit 10.26 to
                           the Company's Annual Report on Form 10-K for the
                           fiscal year ended December 31, 1995, filed March 25,
                           1996.)

10.17                      Rights Agreement, dated as of February 28, 1996,
                           between the Company and Harris Trust Company of
                           California as Rights Agent.  (Incorporated by
                           reference to Exhibit 1 to the Company's Form 8-A,
                           filed March 11, 1996.)

10.18                      Purchase and Sale Agreement dated March 25, 1996
                           between Orion Acquisition, Inc., the Company and
                           Wattenberg Resources Land, L.L.C.  (Incorporated by
                           reference to Exhibit 10.28 to the Company's
                           Quarterly Report on Form 10-Q for the quarter ended
                           March 31, 1996, filed May 15, 1996.)

10.19                      Credit Agreement, dated as of June 7, 1996, among
                           the Company and The Chase Manhattan Bank, N.A.
                           ("Chase"), as agent of the Banks signatory thereto.
                           (Incorporated by reference to the Company's
                           Quarterly Report on Form 10-Q for the quarter ended
                           June 30, 1996, filed August 14, 1996.)

10.20                      Amended and Restated Credit Agreement dated as of
                           June 14, 1996, among the Company, Chase as agent,
                           and the Banks signatory thereto.  (Incorporated by
                           reference to the Company's Quarterly Report on Form
                           10-Q for the quarter ended June 30, 1996, filed
                           August 14, 1996.)

10.21                      First Amendment to Amended and Restated Credit
                           Agreement dated as of June 17, 1996, by and among
                           the Company and Chase in its individual capacity and
                           as agent for the Lenders.  (Incorporated by
                           reference to the Company's Quarterly Report on Form
                           10-Q for the quarter ended June 30, 1996, filed
                           August 14, 1996.)

10.22                      Second Amendment to Amended and Restated Credit
                           Agreement dated as of November 27, 1996 among the
                           Company and Chase in its individual capacity and as
                           agent for the Lenders.  (Incorporated herein by
                           reference to Exhibit 10.22 to the Company's
                           Registration Statement on Form S-4, No.  333-19433,
                           filed January 8, 1997.)

10.23                      Assignment of Liens and Amendment of Amended,
                           Restated and Consolidated Mortgage, Assignment of
                           Production, Security Agreement and Financing
                           Statement, dated June 14,





                                      II-3
<PAGE>   6
                           1996, among Chase (Assignor), Chase (Assignee) and
                           the Company.  (Incorporated by reference to the
                           Company's Quarterly Report on Form 10-Q for the
                           quarter ended June 30, 1996, filed August 14, 1996.)

10.24                      Guaranty Agreement by HSR Acquisition, Inc. in favor
                           of Chase, as Agent, dated June 14, 1996.
                           (Incorporated by reference to the Company's
                           Quarterly Report on Form 10-Q for the quarter ended
                           June 30, 1996, filed August 14, 1996.)

10.25                      Guaranty Agreement by Orion Acquisition, Inc. in
                           favor of Chase, as Agent, dated June 14, 1996.
                           (Incorporated by reference to the Company's
                           Quarterly Report on Form 10-Q for the quarter ended
                           June 30, 1996, filed August 14, 1996.)

10.26                      First Amendment to Guaranty Agreement dated as of
                           June 17, 1996, by and among Orion Acquisition, Inc.
                           and Chase, in its individual capacity and as agent
                           for the Lenders.  (Incorporated by reference to the
                           Company's Quarterly Report on Form 10-Q for the
                           quarter ended June 30, 1996, filed August 14, 1996.)

10.27                      First Amendment to Guaranty Agreement dated as of
                           June 17, 1996, by and among HSRTW, Inc.  (formerly
                           HSR Acquisition, Inc.) and Chase, in its individual
                           capacity and as agent for the Lenders.
                           (Incorporated by reference to the Company's
                           Quarterly Report on Form 10-Q for the quarter ended
                           June 30, 1996, filed August 14, 1996.)

10.28                      Third Amendment and Supplement to Amended, Restated
                           and Consolidated Mortgage, Assignment of Production,
                           Security Agreement and Financing Statement, dated as
                           of July 15, 1996, by and between the Company and
                           Chase.  (Incorporated by reference to the Company's
                           Quarterly Report on Form 10-Q for the quarter ended
                           June 30, 1996, filed August 14, 1996.)

10.29                      Hedging Agreement between Chase and the Company
                           dated May 1, 1996.  (Incorporated by reference to
                           the Company's Quarterly Report on Form 10-Q for the
                           quarter ended June 30, 1996, filed August 14, 1996.)

10.30                      Hedging Agreement between Chase and the Company
                           dated May 1, 1996.  (Incorporated by reference to
                           the Company's Quarterly Report on Form 10-Q for the
                           quarter ended June 30, 1996, filed August 14, 1996.)

10.31                      Hedging Agreement between Chase and the Company
                           dated June 1, 1996.  (Incorporated by reference to
                           the Company's Quarterly Report on Form 10-Q for the
                           quarter ended June 30, 1996, filed August 14, 1996.)

10.32                      Purchase and Sale Agreement between the Company and
                           Wattenberg Gas Investments, LLC dated April 25,
                           1996.  (Incorporated by reference to the Company's
                           Quarterly Report on Form 10-Q for the quarter ended
                           June 30, 1996, filed August 14, 1996.)

10.33                      Purchase and Sale Agreement between Wattenberg
                           Resources Land L.L.C. and Wattenberg Gas
                           Investments, LLC dated May 21, 1996.  (Incorporated
                           by reference to the Company's Quarterly Report on
                           Form 10-Q for the quarter ended June 30, 1996, filed
                           August 14, 1996.)

10.34                      Purchase and Sale Agreement between Orion
                           Acquisition, Inc. and Wattenberg Gas Investments,
                           LLC dated June 14, 1996.  (Incorporated by reference
                           to the Company's Quarterly Report on Form 10-Q for
                           the quarter ended June 30, 1996, filed August 14,
                           1996.)





                                      II-4
<PAGE>   7
10.35                      Purchase and Sale Agreement between Wattenberg
                           Resources Land L.L.C. and Wattenberg Gas
                           Investments, LLC dated June 14, 1996.  (Incorporated
                           by reference to the Company's Quarterly Report on
                           Form 10-Q for the quarter ended June 30, 1996, filed
                           August 14, 1996.)

10.36                      Purchase and Sale Agreement between Orion
                           Acquisition, Inc. and Wattenberg Gas Investments,
                           LLC dated June 14, 1996.  (Incorporated by reference
                           to the Company's Quarterly Report on Form 10-Q for
                           the quarter ended June 30, 1996, filed August 14,
                           1996.)

10.37                      Purchase and Sale Agreement between the Company and
                           Wattenberg Gas Investments, LLC dated June 28, 1996.
                           (Incorporated by reference to the Company's
                           Quarterly Report on Form 10-Q for the quarter ended
                           June 30, 1996, filed August 14, 1996.)

10.38                      Purchase and Sale Agreement between HSRTW, Inc. and
                           Westtide Investments, LLC dated August 9, 1996.
                           (Incorporated by reference to the Company's
                           Quarterly Report on Form 10-Q for the quarter ended
                           September 30, 1996, filed November 7, 1996.)

10.39                      Acquisition Agreement between the Company and TCW
                           Portfolio No. 1555 DR V Sub-Custody Partnership,
                           L.P. dated August 30, 1996.  (Incorporated by
                           reference to the Company's Quarterly Report on Form
                           10-Q for the quarter ended September 30, 1996, filed
                           November 7, 1996.)

10.40                      Purchase Agreement dated November 27, 1996 among the
                           Company, Orion Acquisition, Inc., HSRTW, Inc.,
                           Salomon Brothers Inc., Chase Securities Inc., Lehman
                           Brothers Inc., and Prudential Securities
                           Incorporated.  (Incorporated by reference to Exhibit
                           10.40 to the Company's Registration Statement on
                           Form S-4, No. 333-19433, filed January 8, 1997.)

10.41                      Registration Agreement dated November 27, 1996 among
                           the Company,  Orion Acquisition, Inc., HSRTW, Inc.,
                           and Salomon Brothers Inc. in its individual capacity
                           and as agent for  Chase Securities Inc., Lehman
                           Brothers Inc., and Prudential Securities
                           Incorporated.  (Incorporated by reference to Exhibit
                           10.41 to the Company's Registration Statement on
                           Form S-4, No. 333- 19433, filed January 8, 1997.)

10.42                      Employment Agreement between James Piccone and the
                           Company, dated April 21, 1995.  (Incorporated by
                           reference to Exhibit 10.42 to the Company's Annual 
                           Report on Form 10-K for the fiscal year ended
                           December 31, 1996, filed March 19, 1997.)

10.43                      1997 Performance and Equity Incentive Plan.
                           (Incorporated by reference to Exhibit A to the
                           Company's Definitive Proxy Statement for its Annual
                           Meeting of Stockholders held on May 22, 1997, filed
                           April 24, 1997.)

   
23.1+                      Consent of Arthur Andersen LLP.

23.2+                      Consent of Williamson Petroleum Consultants, Inc.

23.3+                      Consent of Netherland, Sewell & Associates, Inc.

23.4+                      Consent of Davis, Graham & Stubbs LLP (contained in
                           Exhibit 5.1).
    

*                Filed herewith
+                Previously filed


ITEM 17.  UNDERTAKINGS

         The Registrant hereby undertakes that, for the purposes of determining
any liability under the Securities Act of 1933, each filing of the Registrant's
annual report pursuant to section 13(a) or section 15(d) of the Securities
Exchange Act of 1934 (and, where applicable, each filing of an employee benefit
plan's annual report pursuant to section 15(d) of





                                      II-5
<PAGE>   8
the Securities Exchange Act of 1934) that is incorporated by reference in this
Registration Statement shall be deemed to be a new Registration Statement
relating to the securities offered herein, and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.

                 The undersigned Registrant hereby undertakes:

                 (a)    To file, during any period in which offers or
                        sales are being made, a post-effective
                        amendment to this Registration Statement:
                        
                        (i)    to include any prospectus required by Section 
                               10(a)(3) of the Securities Act of 1933;
                        
                        (ii)   to reflect in the prospectus any facts or events
                               arising after the effective date of the
                               Registration Statement (or the most recent
                               post-effective amendment thereof) which,
                               individually or in the aggregate, represent a
                               fundamental change in the information set forth
                               in the Registration Statement; notwithstanding
                               the foregoing, any increase or decrease in volume
                               of securities offered (if the total dollar of
                               securities offered would not exceed that which
                               was registered) and any deviation from the low or
                               high end of the estimated maximum offering range
                               may be reflected in the form of prospectus filed
                               with the Commission pursuant to Rule 424(b) if,
                               in the aggregate, the changes in volume and price
                               represent no more than a 20% change in the
                               maximum aggregate offering price set forth in the
                               "Calculation of Registration Fee" table in the
                               effective registration statement; and
                        
                        (iii)  to include any material information with respect
                               to the plan of distribution not previously
                               disclosed in the Registration Statement or any
                               material change to such information in the
                               Registration Statement,
                        
                        provided, however, that paragraphs (a)(i) and (a)(ii) do
                        not apply if the information required to be included in
                        a post-effective amendment by those paragraphs is
                        contained in periodic reports filed by the Registrant
                        pursuant to Section 13 or Section 15(d) of the
                        Securities Exchange Act of 1934, that are incorporated
                        by reference in the Registration Statement;

                 (b)    That for the purpose of determining any liability under
                        the Securities Act of 1933, each such post-effective
                        amendment shall be deemed to be a new Registration
                        Statement relating to the securities offered therein,
                        and the offering of such securities at that time shall
                        be deemed to be the initial bona fide offering thereof.
                        
                 (c)    To remove from registration by means of a post-effective
                        amendment any of the securities being registered which
                        remain unsold at the termination of the offering.

                 Insofar as indemnification for liabilities arising under the
Securities Act of 1933 may be permitted to directors, officers and controlling
persons of the Registrant pursuant to the foregoing provisions or otherwise,
the Registrant has been advised that in the opinion of the Securities and
Exchange Commission such indemnification is against public policy as expressed
in the Securities Act of 1933 and is, therefore, unenforceable.  In the event
that a claim for indemnification against such liabilities (other than the
payment by the Registrant of expenses is incurred or paid by a director,
officer or controlling person of the Registrant in the successful defense of
any action, suit or proceeding) is asserted by such director, officer or
controlling person in connection with the securities being registered, the
Registrant will, unless in the opinion of its counsel the matter has been
settled by controlling precedent, submit to a court of appropriate jurisdiction
the question whether such indemnification by it is against public policy as
expressed in the Securities Act of 1933 and will be governed by the final
adjudication of such issue.






                                      II-6
<PAGE>   9
                                   SIGNATURES

   
         Pursuant to the requirements of the Securities Act of 1933, the
Registrant certifies that it has reasonable grounds to believe that it meets
all of the requirements for filing on Form S-3 and has duly caused this
Registration Statement to be signed on its behalf by the undersigned, thereunto
duly authorized, in Denver, Colorado on the tenth day of October, 1997.
    

                                     HS Resources, Inc.
                                     a Delaware corporation

                                     By: /s/ Nicholas J. Sutton*               
                                        --------------------------------------
                                              Nicholas J. Sutton
                                              Chairman of the Board and Chief 
                                              Executive Officer


         Pursuant to the requirements of the Securities Act, this Registration
Statement on Form S-3 has been signed by the following persons in the
capacities and on the date indicated.



   
October 10, 1997                    By: /s/ Nicholas J. Sutton*              
Date                                   ----------------------------------------
                                             Nicholas J. Sutton                
                                             Chairman of the Board and Chief   
                                             Executive Officer (Principal      
                                             Executive Officer)                
                                                                               
                                                                               
                                                                               
                                                                               
October 10, 1997                    By: /s/ P. Michael Highum*                  
Date                                   ----------------------------------------
                                             P. Michael Highum                 
                                             President and Director (Principal 
                                             Executive Officer)                
                                                                               
                                                                               
                                                                               
October 10, 1997                    By: /s/ James E. Duffy                     
Date                                   ----------------------------------------
                                             James E. Duffy                    
                                             Vice President - Finance and Chief
                                             Financial Officer and             
                                             Director (Principal Financial     
                                             Officer)                          
    
                                                                               
                                                                               
                                                                               
                                                                               
                                                                               
                                     II-7                                      
<PAGE>   10
   
October 10, 1997                    By: /s/ Annette M. Montoya*                 
Date                                   ----------------------------------------
                                             Annette M. Montoya                
                                             Vice President - Accounting/HR/OM 
                                                                               
                                                                               
                                                                               
                                                                               
October 10, 1997                    By: /s/ Kenneth A. Hersh*                   
Date                                   ----------------------------------------
                                             Kenneth A. Hersh                  
                                             Director                          
                                                                               
                                                                               
                                                                               
                                                                               
October 10, 1997                    By: /s/ Michael J. Savage*                  
Date                                   ----------------------------------------
                                             Michael J. Savage                 
                                             Director                          
                                                                               
                                                                               
                                                                               
                                                                               
October 10, 1997                    By: /s/ Philip B. Smith*                   
Date                                   ----------------------------------------
                                             Philip B. Smith                   
                                             Director
    


                                   *By: /s/ James E. Duffy
                                       ---------------------------------------
                                         Attorney-in-fact
                




                                     II-8
<PAGE>   11
                                 EXHIBIT INDEX


   
<TABLE>
<CAPTION>
       EXHIBIT                                                                      PAGE
       NUMBER                         DESCRIPTION                                  NUMBER
       <S>          <C>                                                            <C>
        1.1         Underwriting Agreement dated October 9, 1997 by and 
                    among HS Resources, Inc., Orion Acquisition, Inc.,
                    HSRTW, Inc., HS Energy Services, Inc., Natural Gas
                    Partners, L.P., Lehman Brothers Inc., Merrill Lynch &
                    Co. and Petrie Parkman & Co.
</TABLE>
    








<PAGE>   1
                                1,850,010 SHARES

                               HS RESOURCES, INC.

                                  COMMON STOCK

                             UNDERWRITING AGREEMENT

                                                                October 9, 1997

LEHMAN BROTHERS INC.
MERRILL LYNCH & CO.
PETRIE PARKMAN & CO.
As Representatives of the several
  Underwriters named in Schedule 1,
c/o Lehman Brothers Inc.
Three World Financial Center
New York, New York 10285

Dear Sirs:

                  Natural Gas Partners, L.P., a Delaware limited partnership
(the "Selling Stockholder"), proposes to sell an aggregate of 1,850,010 shares
(the "Stock") of the common stock, par value $0.001 per share (the "Common
Stock"), of HS Resources, Inc., a Delaware corporation (the "Company"). This is
to confirm the agreement concerning the purchase of the Stock from the Selling
Stockholder by the Underwriters named in Schedule 1 hereto (the
"Underwriters").

                  1. Representations, Warranties and Agreements of the Company.
The Company represents, warrants and agrees that:

                           (a) A registration statement on Form S-3 (No.
                  333-28825) with respect to the Stock has (i) been prepared by
                  the Company in conformity with the requirements of the United
                  States Securities Act of 1933 (the "Securities Act") and the
                  rules and regulations (the "Rule and Regulations") of the
                  United States Securities and Exchange Commission (the
                  "Commission") thereunder, (ii) been filed with the Commission
                  under the Securities Act and (iii) become effective under the
                  Securities Act. Copies of such registration statement and the
                  amendment thereto have been delivered by the Company to you
                  as the Representatives (the "Representatives") of the
                  Underwriters. As used in this Agreement, "Registration
                  Statement" means such registration statement, as amended to
                  the date of this Agreement, including the exhibits and
                  schedules thereto, if any, and all documents incorporated by
                  reference or deemed to be incorporated by reference therein
                  and the exhibits and schedules thereto and all information
                  contained in the final Prospectus (as defined herein) filed
                  with the Commission pursuant to Rule 424(b) of the Rules and
                  Regulations and deemed to be a part of the registration
                  statement as of the Effective Time pursuant to paragraph (b)
                  of Rule 430A of the Rules and Regulations; "Effective Time"
                  means the date and the time as of which the Registration
                  Statement, or the most recent post-effective amendment
                  thereto, if any, was declared effective by the Commission;
                  "Effective Date" means the date of the Effective Time; "Basic
                  Prospectus" means the prospectus included in the Registration
                  Statement; "Preliminary Prospectus" means any preliminary
                  form of Prospectus 


<PAGE>   2

                  specifically relating to the Stock, in the form first filed
                  with, or transmitted for filing to, the Commission pursuant
                  to Rule 424 of the Rules and Regulations; "Prospectus
                  Supplement" means any prospectus supplement specifically
                  relating to the Stock, in the form first filed with, or
                  transmitted for filing to, the Commission pursuant to Rule
                  424 of the Rules and Regulations; and "Prospectus" means the
                  Basic Prospectus, together with the Prospectus Supplement,
                  except that if such Basic Prospectus is amended or
                  supplemented on or prior to the date on which the Prospectus
                  Supplement was first filed with the Commission pursuant to
                  Rule 424 of the Rules and Regulations, the term "Prospectus"
                  shall refer to the Basic Prospectus as so amended or
                  supplemented and as supplemented by the Prospectus
                  Supplement. Reference made herein to any Preliminary
                  Prospectus or to the Prospectus shall be deemed to refer to
                  and include any documents incorporated by reference therein
                  pursuant to Item 12 of Form S-3 under the Securities Act, as
                  of the date of such Preliminary Prospectus or the Prospectus,
                  as the case may be, and any reference to any amendment or
                  supplement to any Preliminary Prospectus or the Prospectus
                  shall be deemed to refer to and include any document filed
                  under the United States Securities Exchange Act of 1934 (the
                  "Exchange Act") after the date of such Preliminary Prospectus
                  or the Prospectus, as the case may be, and incorporated by
                  reference in such Preliminary Prospectus or the Prospectus,
                  as the case may be, and any reference to any amendment to the
                  Registration Statement shall be deemed to include any annual
                  report of the Company filed with the Commission pursuant to
                  Section 13(a) or 15(d) of the Exchange Act after the
                  Effective Time that is incorporated by reference in the
                  Registration Statement. The Commission has not issued any
                  order preventing or suspending the use of the Prospectus or
                  the effectiveness of the Registration Statement.

                           (b) The Registration Statement conforms, and the
                  Prospectus and any further amendments or supplements to the
                  Registration Statement or the Prospectus will, when they
                  become effective or are filed with the Commission, as the
                  case may be, conform in all respects to the requirements of
                  the Securities Act and the Rules and Regulations and do not
                  and will not, as of the applicable effective date (as to the
                  Registration Statement and any amendment thereto) and as of
                  the applicable filing date (as to the Prospectus and any
                  amendment or supplement thereto) contain an untrue statement
                  of a material fact or omit to state a material fact required
                  to be stated therein or necessary to make the statements
                  therein (in the case of the Prospectus, the light of the
                  circumstances in which they were made) not misleading;
                  provided that no representation or warranty is made as to
                  information contained in or omitted from the Registration
                  Statement or the Prospectus in reliance upon and in
                  conformity with written information furnished to the Company
                  through the Representatives by or on behalf of any
                  Underwriter specifically for inclusion therein.

                           (c) The documents incorporated or deemed to be
                  incorporated by reference in the Prospectus, when they became
                  effective or were filed with the Commission, as the case may
                  be, conformed in all material respects to the requirements of
                  the Securities Act or the Exchange Act, as applicable, and
                  the rules and regulations of the Commission thereunder, and
                  none of such documents contained an untrue statement of 


                                       2
<PAGE>   3

                  a material fact or omitted to state a material fact required
                  to be stated therein or necessary to make the statements
                  therein not misleading; and any further documents so filed
                  and incorporated by reference in the Prospectus, when such
                  documents become effective or are filed with Commission, as
                  the case may be, will conform in all material respects to the
                  requirements of the Securities Act or the Exchange Act, as
                  applicable, and the rules and regulations of the Commission
                  thereunder and will not contain an untrue statement of a
                  material fact or omit to state a material fact required to be
                  stated therein or necessary to make the statements therein
                  not misleading.

                           (d) The Company and each of its subsidiaries (as
                  defined in Section 17) have been duly incorporated or formed
                  and are validly existing as corporations or partnerships in
                  good standing under the laws of their respective
                  jurisdictions of incorporation or formation, are duly
                  qualified to do business and are in good standing as foreign
                  corporations or partnerships in each jurisdiction in which
                  their respective ownership or lease of property or the
                  conduct of their respective businesses requires such
                  qualification (except where the failure to so qualify would
                  not result in a material adverse effect on the condition,
                  financial or otherwise, results of operations or business
                  prospects of the Company and its subsidiaries, taken as a
                  whole (a "Material Adverse Effect"), and have all power
                  (corporate and other) and authority necessary to own or hold
                  their respective properties and to conduct the businesses in
                  which they are engaged as described in the Prospectus; and
                  none of the subsidiaries of the Company (other than Orion
                  Acquisition, Inc., HSRTW, Inc., HS Energy Services, Inc. and
                  Resources Gathering Systems, Inc. (collectively, the
                  "Significant Subsidiaries")) is a "significant subsidiary" as
                  such term is defined in Rule 405 of the Rules and
                  Regulations.

                           (e) The Company has an authorized capitalization as
                  set forth in the Prospectus, and all of the issued shares of
                  capital stock of the Company have been duly and validly
                  authorized and issued, are fully paid and non-assessable and
                  conform to the description thereof contained or incorporated
                  by reference in the Prospectus; and all of the issued shares
                  of capital stock of each subsidiary of the Company have been
                  duly and validly authorized and issued and are fully paid and
                  non-assessable and (except for directors' qualifying shares)
                  are owned directly or indirectly by the Company, free and
                  clear of all liens, encumbrances, equities or claims.

                           (f) The shares of the Stock to be sold by the
                  Selling Stockholder to the Underwriters hereunder have been
                  duly and validly authorized and issued and are fully paid and
                  non-assessable.

                           (g) This Agreement has been duly authorized,
                  executed and delivered by the Company.

                           (h) The execution, delivery and performance of this
                  Agreement by the Company and the consummation of the
                  transactions contemplated hereby will not conflict with or
                  result in a breach or violation of any of the terms or
                  provisions of, or 


                                       3
<PAGE>   4

                  constitute a default under, any indenture, mortgage, deed of
                  trust, loan agreement or other agreement or instrument to
                  which the Company or any of its subsidiaries is a party or by
                  which the Company or any of its subsidiaries is bound or to
                  which any of the property or assets of the Company or any of
                  its subsidiaries is subject, nor will such actions result in
                  any violation of the provisions of the charter or by-laws of
                  the Company or any of its subsidiaries or any statute or any
                  order, rule or regulation of any court or governmental agency
                  or body having jurisdiction over the Company or any of its
                  subsidiaries or any of their properties or assets; and except
                  for the registration of the Stock under the Securities Act
                  and such consents, approvals, authorizations, registrations
                  or qualifications as may be required under the Exchange Act
                  and applicable state securities laws in connection with the
                  purchase and distribution of the Stock by the Underwriters,
                  no consent, approval, authorization or order of, or filing or
                  registration with, any such court or governmental agency or
                  body is required for the execution, delivery and performance
                  of this Agreement by the Company and the consummation of the
                  transactions contemplated hereby.

                           (i) There are no contracts, agreements or
                  understandings between the Company and any person granting
                  such person the right (other than rights which have been
                  waived, satisfied or not exercised) to require the Company to
                  file a registration statement under the Securities Act with
                  respect to any securities of the Company owned or to be owned
                  by such person or to require the Company to include such
                  securities in the securities registered pursuant to the
                  Registration Statement or in any securities being registered
                  pursuant to any other registration statement filed by the
                  Company under the Securities Act.

                           (j) Except as described in the Prospectus, the
                  Company has not sold or issued any shares of Common Stock
                  during the six-month period preceding the date of the
                  Prospectus, including any sales pursuant to Rule 144A under,
                  or Regulations D or S of, the Securities Act, other than
                  shares issued pursuant to outstanding options, rights or
                  warrants or under Company equity incentive plans.

                           (k) Neither the Company nor any of its subsidiaries
                  has sustained, since the date of the latest audited financial
                  statements incorporated by reference in the Prospectus, any
                  loss or interference with its business from fire, explosion,
                  flood or other calamity, whether or not covered by insurance,
                  or from any labor dispute or court or governmental action,
                  order or decree, otherwise than as set forth or incorporated
                  by reference in the Prospectus, except for such losses,
                  interferences, disputes, actions, orders or decrees that do
                  not have individually or in the aggregate a Material Adverse
                  Effect; and, since the respective dates as of which
                  information is given in the Registration Statement and the
                  Prospectus, there has not been any material change in the
                  capital stock or long-term debt of the Company or any of its
                  subsidiaries or any material adverse change, or any
                  development involving a prospective material adverse change,
                  in or affecting the general affairs, management, financial
                  position, stockholders' equity or results of operations of
                  the Company and its subsidiaries, otherwise than as set forth
                  or incorporated by reference in the Prospectus.



                                       4
<PAGE>   5

                           (l) The financial statements (including the related
                  notes and supporting schedules) filed as part of the
                  Registration Statement or incorporated by reference in the
                  Prospectus present fairly the financial condition and results
                  of operations of the entities purported to be shown thereby,
                  at the dates and for the periods indicated, and have been
                  prepared in conformity with generally accepted accounting
                  principles applied on a consistent basis throughout the
                  periods involved, except as otherwise stated therein.

                           (m) Arthur Anderson L.L.P., who have certified
                  certain financial statements of the Company, whose report is
                  incorporated by reference in the Prospectus and who have
                  delivered the initial letter referred to in Section 9(g)
                  hereof, are independent public accountants as required by the
                  Securities Act and the Rules and Regulations

                           (n) Williamson Petroleum Consultants, Inc. and
                  Netherland Sewell & Associates, Inc., whose reports are
                  incorporated by reference in the Prospectus, as of the date
                  of such report, and are, as of the date hereof, independent
                  petroleum engineers with respect to the Company.

                           (o) The Company and each of its subsidiaries have
                  good and indefeasible title to all items of real property and
                  good title to all personal property owned by them, in each
                  case free and clear of all security interests, liens,
                  encumbrances, equities, claims and other defects except such
                  as are described in the Prospectus or such as do not
                  materially and adversely affect the value of such property
                  and do not interfere with the use made and proposed to be
                  made of such property by the Company and its subsidiaries;
                  and the Company and its subsidiaries have valid, subsisting
                  and enforceable leases for the properties described in the
                  Prospectus as leased by them, with such exceptions as are not
                  material and do not interfere with the business of the
                  Company and its subsidiaries, taken as a whole, in each case
                  except as described in or contemplated in the Prospectus.

                           (p) The Company and each of its subsidiaries carry,
                  or are covered by, insurance in such amounts and covering
                  such risks as is adequate for the conduct of their respective
                  businesses and the value of their respective properties and
                  as is customary for companies of similar size and engaged in
                  similar businesses in similar industries.

                           (q) The Company and each of its subsidiaries own or
                  possess adequate rights to use all material patents, patent
                  applications, trademarks, service marks, trade names,
                  trademark registrations, service mark registrations,
                  copyrights and intellectual property licenses necessary for
                  the conduct of their respective businesses and have no reason
                  to believe that the conduct of their respective businesses
                  will conflict with, and have not received any notice of any
                  claim of conflict with, any such rights of others.



                                       5
<PAGE>   6

                           (r) Except as set forth in the Registration
                  Statement, the Prospectus or in the documents incorporated by
                  reference, there are no legal or governmental proceedings
                  pending to which the Company or any of its subsidiaries is a
                  party or of which any property or assets of the Company or
                  any of its subsidiaries is the subject which, if determined
                  adversely to the Company or any of its subsidiaries, might
                  have a Material Adverse Effect; and to the Company's
                  knowledge, no such proceedings are threatened or contemplated
                  by governmental authorities or threatened by others.

                           (s) The conditions for use of Form S-3, as set forth
                  in the General Instructions thereto, have been satisfied by
                  the Company.

                           (t) There are no contracts or other documents which
                  are required to be described in the Prospectus or filed as
                  exhibits to the Registration Statement by the Securities Act
                  or by the Rules and Regulations which have not been described
                  in the Prospectus or filed as exhibits to the Registration
                  Statement or incorporated therein by reference as permitted
                  by the Rules and Regulations.

                           (u) No relationship, direct or indirect, exists
                  between or among the Company on the one hand, and the
                  directors, officers, stockholders, customers or suppliers of
                  the Company on the other hand, which is required to be
                  described in the Prospectus which is not so described in the
                  Prospectus or incorporated therein by reference as permitted
                  by the Rules and Regulations.

                           (v) No labor disturbance by the employees of the
                  Company exists or, to the knowledge of the Company, is
                  imminent which reasonably could be expected to have a
                  Material Adverse Effect.

                           (w) The Company is in compliance in all material
                  respects with all presently applicable provisions of the
                  Employee Retirement Income Security Act of 1974, as amended,
                  including the regulations and published interpretations
                  thereunder ("ERISA"); no "reportable event" (as defined in
                  ERISA) has occurred with respect to any "pension plan" (as
                  defined in ERISA) for which the Company would have any
                  liability; the Company has not incurred and does not expect
                  to incur liability under (i) Title IV of ERISA with respect
                  to termination of, or withdrawal from, any "pension plan" or
                  (ii) Sections 412 or 4971 of the Internal Revenue Code of
                  1986, as amended, including the regulations and published
                  interpretations thereunder (the "Code"); and each "pension
                  plan" for which the Company would have any liability that is
                  intended to be qualified under Section 401(a) of the Code is
                  so qualified in all material respects and nothing has
                  occurred, whether by action or by failure to act, which would
                  cause the loss of such qualification.

                           (x) The Company has filed all federal, state and
                  local income and franchise tax returns required to be filed
                  through the date hereof or has timely requested extensions
                  thereof and has paid all taxes due thereon, and no tax
                  deficiency has been determined adversely to the Company or
                  any of its subsidiaries which has had (nor does the 


                                       6
<PAGE>   7

                  Company have any knowledge of any tax deficiency which, if
                  determined adversely to the Company or any of its
                  subsidiaries, might have) a Material Adverse Effect.

                           (y) Since the date as of which information is given
                  in the Prospectus through the date hereof, and except as may
                  otherwise be disclosed in the Prospectus, the Company has not
                  (i) issued or granted any securities (except pursuant to
                  Company equity incentive plans), (ii) incurred any liability
                  or obligation, direct or contingent, other than liabilities
                  and obligations which were incurred in the ordinary course of
                  business, (iii) entered into any transaction not in the
                  ordinary course of business or (iv) declared or paid any
                  dividend on its capital stock.

                           (z) The Company (i) makes and keeps accurate books
                  and records and (ii) maintains internal accounting controls
                  which provide reasonable assurance that (A) transactions are
                  executed in accordance with management's general or specific
                  authorization, (B) transactions are recorded as necessary to
                  permit preparation of its financial statements and to
                  maintain accountability for its assets, (C) access to its
                  assets is permitted only in accordance with management's
                  general or specific authorization and (D) the reported
                  accountability for its assets is compared with existing
                  assets at reasonable intervals.

                           (aa) Neither the Company nor any of its subsidiaries
                  (i) is in violation of its charter or by-laws, (ii) is in
                  default in any material respect, and no event has occurred
                  which, with notice or lapse of time or both, would constitute
                  such a default, in the due performance or observance of any
                  term, covenant or condition contained in any material
                  indenture, mortgage, deed of trust, loan agreement or other
                  agreement or instrument to which it is a party or by which it
                  is bound or to which any of its properties or assets is
                  subject or (iii) is in violation in any material respect of
                  any law, ordinance, governmental rule, regulation or court
                  decree to which it or its property or assets may be subject
                  or has failed to obtain any material license, permit,
                  certificate, franchise or other governmental authorization or
                  permit necessary to the ownership of its property or to the
                  conduct of its business, except, in the case of (ii) or (iii)
                  above, for such defaults and violations that would not have a
                  Material Adverse Effect.

                           (ab) Neither the Company nor any of its
                  subsidiaries, nor any director, officer, agent, employee or
                  other person associated with or acting on behalf of the
                  Company or any of its subsidiaries, has used any corporate
                  funds for any unlawful contribution, gift, entertainment or
                  other unlawful expense relating to political activity; made
                  any direct or indirect unlawful payment to any foreign or
                  domestic government official or employee from corporate
                  funds; violated or is in violation of any provision of the
                  Foreign Corrupt Practices Act of 1977; or made any bribe,
                  rebate, payoff, influence payment, kickback or other unlawful
                  payment.

                           (ac) Except as disclosed or incorporated by
                  reference in the Prospectus, there has been no storage,
                  disposal, generation, manufacture, refinement,
                  transportation, handling or treatment of toxic wastes,
                  medical wastes, hazardous wastes or hazardous 


                                       7
<PAGE>   8

                  substances by the Company or any of its subsidiaries (or, to
                  the knowledge of the Company, any of their predecessors in
                  interest) at, upon or from any of the property now or
                  previously owned or leased by the Company or its subsidiaries
                  in violation of any applicable law, ordinance, rule,
                  regulation, order, judgment, decree or permit or which would
                  require remedial action under any applicable law, ordinance,
                  rule, regulation, order, judgment, decree or permit, except
                  for any violation or remedial action which would not have, or
                  could not be reasonably likely to have, singularly or in the
                  aggregate with all such violations and remedial actions, a
                  Material Adverse Effect; there has been no material spill,
                  discharge, leak, emission, injection, escape, dumping or
                  release of any kind onto such property or into the
                  environment surrounding such property of any toxic wastes,
                  medical wastes, solid wastes, hazardous wastes or hazardous
                  substances due to or caused by the Company or any of its
                  subsidiaries or with respect to which the Company or any of
                  its subsidiaries have knowledge, except for any such spill,
                  discharge, leak, emission, injection, escape, dumping or
                  release which would not have or would not be reasonably
                  likely to have, singularly or in the aggregate with all such
                  spills, discharges, leaks, emissions, injections, escapes,
                  dumpings and releases, a Material Adverse Effect; and the
                  terms "hazardous wastes", "toxic wastes", "hazardous
                  substances" and "medical wastes" shall have the meanings
                  specified in any applicable local, state, federal and foreign
                  laws or regulations with respect to environmental protection.

                           (ad) Neither the Company nor any subsidiary is an
                  "investment company" within the meaning of such term under
                  the Investment Company Act of 1940, as amended, and the rules
                  and regulations of the Commission thereunder.

                           (ae) Any certificate signed by any officer of the
                  Company and delivered to the Underwriters or to counsel for
                  the Underwriters shall be deemed a representation and
                  warranty by the Company to each Underwriter as to the matters
                  covered thereby.

                  2. Representations, Warranties and Agreements of the Selling
Stockholder. The Selling Stockholder represents, warrants and agrees that:

                           (a) The Selling Stockholder has, and immediately
                  prior to the Delivery Date (as defined in Section 5 hereof)
                  the Selling Stockholder will have, valid and marketable title
                  to the shares of Stock to be sold by the Selling Stockholder
                  hereunder on such date, free and clear of all liens,
                  encumbrances, equities or claims; and upon delivery of such
                  shares and payment therefor pursuant hereto, valid and
                  marketable title to such shares, free and clear of all liens,
                  encumbrances, equities or claims, will pass to the several
                  Underwriters.

                           (b) The Selling Stockholder has full right, power
                  and authority to enter into this Agreement, and any escrow
                  agreement, custody agreement or other similar instrument that
                  may be required in connection with the delivery of the shares
                  of Stock to the Underwriters (the "Ancillary Documents"); the
                  execution, delivery and performance of this Agreement and the
                  Ancillary Documents, if any, by the Selling 


                                       8
<PAGE>   9

                  Stockholder and the consummation by the Selling Stockholder
                  of the transactions contemplated hereby and thereby will not
                  conflict with or result in a breach or violation of any of
                  the terms or provisions of, or constitute a default under,
                  any indenture, mortgage, deed of trust, loan agreement or
                  other agreement or instrument to which the Selling
                  Stockholder is a party or by which the Selling Stockholder is
                  bound or to which any of the property or assets of the
                  Selling Stockholder is subject, nor will such actions result
                  in any violation of the provisions of the partnership
                  agreement of the Selling Stockholder or any statute or any
                  order, rule or regulation of any court or governmental agency
                  or body having jurisdiction over the Selling Stockholder or
                  the property or assets of the Selling Stockholder; and,
                  except for the registration of the Stock under the Securities
                  Act and such consents, approvals, authorizations,
                  registrations or qualifications as may be required under the
                  Exchange Act and applicable state securities laws in
                  connection with the purchase and distribution of the Stock by
                  the Underwriters, no consent, approval, authorization or
                  order of, or filing or registration with, any such court or
                  governmental agency or body is required for the execution,
                  delivery and performance of this Agreement and the Ancillary
                  Documents, if any, by the Selling Stockholder and the
                  consummation by the Selling Stockholder of the transactions
                  contemplated hereby and thereby.

                           (c) The Selling Stockholder Information (as defined
                  in Section 10(b)) furnished by the Selling Stockholder does
                  not contain an untrue statement of a material fact or omit to
                  state a material fact required to be stated therein or
                  necessary to make the statements therein not misleading.

                           (d) The Selling Stockholder, without having
                  conducted any independent investigation into the affairs of
                  the Company, has no knowledge that the representations and
                  warranties of the Company contained in Section 1 hereof are
                  not materially true and correct, is familiar with the
                  Registration Statement and the Prospectus (as amended or
                  supplemented) and has no knowledge of any material fact,
                  condition or information not disclosed in the Prospectus (or
                  any amendment or supplement thereto), as of the applicable
                  filing date, which has adversely affected or may adversely
                  affect the business of the Company and is not prompted to
                  sell shares of Common Stock by any information concerning the
                  Company which is not set forth in the Prospectus.

                           (e) The Selling Stockholder has not taken and will
                  not take, directly or indirectly, any action which is
                  designed to or which has constituted or which might
                  reasonably be expected to cause or result in the
                  stabilization or manipulation of the price of any security of
                  the Company to facilitate the sale or resale of the shares of
                  the Stock.

                           (f) The Selling Stockholder has advised the
                  Representatives if either it or any of its affiliates
                  directly, or indirectly through one or more of its
                  intermediaries, controls, or is controlled by, or is under
                  common control with, or has any other association with
                  (within the meaning of Article I, Section 1(q) of the By-laws
                  of the National 


                                       9
<PAGE>   10

                  Association of Securities Dealers, Inc.), any member firm of
                  the National Association of Securities Dealers, Inc.

                  3. Purchase of the Stock by the Underwriters. On the basis of
the representations and warranties contained in, and subject to the terms and
conditions of, this Agreement, the Selling Stockholder hereby agrees to sell
the Stock to the several Underwriters, and each of the Underwriters, severally
and not jointly, agrees to purchase the number of shares of the Stock set
opposite that Underwriter's name in Schedule 1 hereto. The respective purchase
obligations of the Underwriters with respect to the Stock shall be rounded
among the Underwriters to avoid fractional shares, as the Representatives may
determine.

                  The price of the Stock shall be $16.87 per share.

                  The Selling Stockholder shall not be obligated to deliver any
of the Stock to be delivered on the Delivery Date, except upon payment for all
the Stock to be purchased on the Delivery Date as provided herein.

                  4. Offering of Stock by the Underwriters. Upon authorization
by the Representatives of the release of the Stock, the several Underwriters
shall offer the Stock for sale upon the terms and conditions set forth in the
Prospectus.

                  5. Delivery of and Payment for the Stock. Delivery of and
payment for the Stock shall be made at the office of Davis, Graham & Stubbs
LLP, 370 Seventeenth Street, Suite 4700, Denver, CO 80201, at 9:00 A.M., Denver
time, on the third full business day following the date of this Agreement or at
such other date or place as shall be determined by agreement between the
Representatives and the Selling Stockholder. This date and time are sometimes
referred to as the "Delivery Date." On the Delivery Date, the Selling
Stockholder shall deliver or cause to be delivered certificates representing
the Stock to the Representatives for the account of each Underwriter against
payment to or upon the order of the Selling Stockholder of the purchase price
by wire transfer in immediately available funds to a bank account designated by
the Selling Stockholder in writing to the Representatives. Time shall be of the
essence, and delivery at the time and place specified pursuant to this
Agreement is a further condition of the obligation of each Underwriter
hereunder. Upon delivery, the Stock shall be registered in such names and in
such denominations as the Representatives shall request in writing not less
than two full business days prior to the Delivery Date. For the purpose of
expediting the checking and packaging of the certificates for the Stock, the
Selling Stockholder shall make the certificates representing the Stock
available for inspection by the Representatives in New York, New York, not
later than 2:00 P.M., New York City time, on the business day prior to the
Delivery Date.

                  On the Delivery Date, the Selling Stockholder will pay, or
cause to be paid, the commission payable on the Delivery Date to the
Underwriters under the last paragraph of Section 3 by certified or official
bank check or checks payable in New York Clearing House (next-day) funds.

                  6. Further Agreements of the Company. The Company agrees:



                                      10
<PAGE>   11

                           (a) To prepare the Prospectus in a form approved by
                  the Representatives and to file such Prospectus pursuant to
                  Rule 424(b) under the Securities Act not later than
                  Commission's close of business on the second business day
                  following the execution and delivery of this Agreement or, if
                  applicable, such earlier time as may be required by Rule
                  430A(a)(3) under the Securities Act; except for such
                  post-effective amendment made under Rule 462(d) under the
                  Securities Act, which amendment shall be approved by the
                  Representatives, to make no further amendment or any
                  supplement to the Registration Statement or to the Prospectus
                  prior to the Delivery Date except as permitted herein; to
                  advise the Representatives, promptly after it receives notice
                  thereof, of the time when any amendment to the Registration
                  Statement has been filed or becomes effective or any
                  supplement to the Prospectus or any amended Prospectus has
                  been filed and to furnish the Representatives with copies
                  thereof; to file promptly all reports and any definitive
                  proxy or information statements required to be filed by the
                  Company with the Commission pursuant to Section 13(a), 13(c),
                  14 or 15(d) of the Exchange Act subsequent to the date of the
                  Prospectus and for so long as the delivery of a prospectus is
                  required in connection with the offering or sale of the
                  Stock; to advise the Representatives, promptly after it
                  receives notice thereof, of the issuance by the Commission of
                  any stop order or of any order preventing or suspending the
                  use of any Preliminary Prospectus or the Prospectus, of the
                  suspension of the qualification of the Stock for offering or
                  sale in any jurisdiction, of the initiation or threatening of
                  any proceeding for any such purpose, or of any request by the
                  Commission for the amending or supplementing of the
                  Registration Statement or the Prospectus or for additional
                  information; and, in the event of the issuance of any stop
                  order or of any order preventing or suspending the use of any
                  Preliminary Prospectus or the Prospectus or suspending any
                  such qualification, to use promptly its best efforts to
                  obtain its withdrawal;

                           (b) To furnish promptly to each Representative and
                  to counsel for the Underwriters a signed copy of the
                  Registration Statement as originally filed with the
                  Commission, and each amendment thereto filed with the
                  Commission, including all consents and exhibits filed
                  therewith;

                           (c) To deliver promptly to each Representative such
                  number of the following documents as such Representative
                  shall reasonably request: (i) conformed copies of the
                  Registration Statement as originally filed with the
                  Commission and each amendment thereto (in each case excluding
                  exhibits other than this Agreement and the computation of per
                  share earnings), (ii) each Preliminary Prospectus, the
                  Prospectus and any amended or supplemented Prospectus and
                  (iii) any document incorporated by reference in the
                  Prospectus (excluding exhibits thereto); and, if the delivery
                  of a prospectus is required at any time after the Effective
                  Time in connection with the offering or sale of the Stock and
                  if at such time any events shall have occurred as a result of
                  which the Prospectus as then amended or supplemented would
                  include an untrue statement of a material fact or omit to
                  state any material fact necessary in order to make the
                  statements therein, in the light of the circumstances under
                  which they were made when such Prospectus is delivered, not
                  misleading, or, if for any other reason it 


                                      11
<PAGE>   12

                  shall be necessary to amend or supplement the Prospectus or
                  to file under the Exchange Act any document incorporated by
                  reference in the Prospectus in order to comply with the
                  Securities Act or the Exchange Act, to notify the
                  Representatives and, upon their request, to file such
                  document and to prepare and furnish without charge to each
                  Underwriter and to any dealer in securities as many copies as
                  each Representative may from time to time reasonably request
                  of an amended or supplemented Prospectus which will correct
                  such statement or omission or effect such compliance;

                           (d) To file promptly with the Commission any
                  amendment to the Registration Statement or the Prospectus or
                  any supplement to the Prospectus that may, in the judgment of
                  the Company or the Representatives, be required by the
                  Securities Act or requested by the Commission;

                           (e) During the period when a prospectus is required
                  to be delivered in connection with the offering or sale of
                  the Stock, prior to filing with the Commission any amendment
                  to the Registration Statement or supplement to the
                  Prospectus, any document incorporated by reference in the
                  Prospectus or any Prospectus pursuant to Rule 424 of the
                  Rules and Regulations, to furnish a copy thereof to each
                  Representative and counsel for the Underwriters and obtain
                  the consent of the Representatives to the filing;

                           (f) As soon as practicable after the Effective Date,
                  to make generally available to the Company's security holders
                  and to deliver to the Representatives an earnings statement
                  of the Company and its subsidiaries (which need not be
                  audited) complying with Section 11(a) of the Securities Act
                  and the Rules and Regulations (including, at the option of
                  the Company, Rule 158);

                           (g) For a period of five years following the
                  Effective Date, to furnish to the Representatives copies of
                  all materials furnished by the Company to its stockholders
                  and all public reports and all reports and financial
                  statements furnished by the Company to the principal national
                  securities exchange upon which the Common Stock may be listed
                  pursuant to requirements of or agreements with such exchange
                  or to the Commission pursuant to the Exchange Act or any rule
                  or regulation of the Commission thereunder;

                           (h) Promptly from time to time to take such action
                  as the Representatives may reasonably request to qualify the
                  Stock for offering and sale under the securities laws of such
                  jurisdictions as the Representatives may request and to
                  comply with such laws so as to permit the continuance of
                  sales and dealings therein in such jurisdictions for as long
                  as may be necessary to complete the distribution of the
                  Stock;

                           (i) For a period of 45 days from the Delivery Date,
                  not to, directly or indirectly, (i) offer for sale, sell,
                  pledge or otherwise dispose of (or enter into any transaction
                  or device which is designed to, or could be expected to,
                  result in the disposition by any person at any time in the
                  future of) any shares of Common Stock or 


                                      12
<PAGE>   13

                  securities convertible into or exchangeable for Common Stock
                  (other than the Stock), or sell or grant options, rights or
                  warrants with respect to any shares of Common Stock or
                  securities convertible into or exchangeable for Common Stock,
                  other than grants of options pursuant to the Company's
                  employee or director option plans existing on the date
                  hereof, or (ii) enter into any swap or other derivatives
                  transaction that transfers to another, in whole or in part,
                  any of the economic benefits or risks of ownership of such
                  shares of Common Stock, whether any such transaction
                  described in clause (i) or (ii) above is to be settled by
                  delivery of Common Stock or other securities, in cash or
                  otherwise, in each case without the prior written consent of
                  Lehman Brothers Inc.;

                           (j) Prior to the Effective Date, to apply for the
                  listing of the Stock on the New York Stock Exchange, Inc. and
                  to use its best efforts to complete that listing, subject
                  only to official notice of issuance, prior to the Delivery
                  Date; and

                           (k) To take such steps as shall be necessary to
                  ensure that neither the Company nor any subsidiary shall
                  become an "investment company" within the meaning of such
                  term under the Investment Company Act of 1940, as amended,
                  and the rules and regulations of the Commission thereunder.

                  7. Further Agreements of the Selling Stockholder. The Selling
Stockholder agrees:

                           (a) Except for Permitted Dispositions (as defined
                  below), for a period of 90 days from the Delivery Date, not
                  to, directly or indirectly, (i) offer for sale, sell, pledge
                  or otherwise dispose of (or enter into any transaction or
                  device which is designed to, or could be expected to, result
                  in the disposition by any person at any time in the future
                  of) any shares of Common Stock or securities convertible into
                  or exchangeable for Common Stock (other than the Stock) or
                  (ii) enter into any swap or other derivatives transaction
                  that transfers to another, in whole or in part, any of the
                  economic benefits or risks of ownership of such shares of
                  Common Stock, whether any such transaction described in
                  clause (i) or (ii) above is to be settled by delivery of
                  Common Stock or other securities, in cash or otherwise, in
                  each case without the prior written consent of Lehman
                  Brothers Inc. The foregoing sentence shall not apply to the
                  shares of Common Stock to be sold hereunder. "Permitted
                  Dispositions" mean (i) a bona fide gift, provided that the
                  donee thereof agrees in writing to be bound by the
                  restrictions imposed by this Section 7(a), (ii) a
                  distribution to partners of the Selling Stockholder and its
                  general partner, provided that such distributees agree in
                  writing to be bound by the restrictions imposed by this
                  Section 7(a), or (iii) a transfer to an affiliate of the
                  Selling Stockholder, provided that the affiliate agrees in
                  writing to be bound by the restrictions imposed by this
                  Section 7(a).

                           (b) That the Stock to be sold by the Selling
                  Stockholder hereunder is subject to the interest of the
                  Underwriters and that the obligations of the Selling
                  Stockholder hereunder shall not be terminated by any act of
                  the Selling Stockholder, by operation of law or the
                  occurrence of any other event.



                                      13
<PAGE>   14

                           (c) To deliver to the Representatives prior to the
                  Delivery Date a properly completed and executed United States
                  Treasury Department Form W-9.

                  8. Expenses. The Company agrees to pay: (a) the costs
incident to the authorization, issuance, sale and delivery of the Stock and any
taxes payable in that connection; (b) the costs incident to the preparation,
printing and filing under the Securities Act of the Registration Statement and
any amendments and exhibits thereto; (c) the costs of distributing the
Registration Statement as originally filed and each amendment thereto and any
post-effective amendments thereof (including, in each case, exhibits), any
Preliminary Prospectus, the Prospectus and any amendment or supplement to the
Prospectus or any document incorporated by reference therein, all as provided
in this Agreement; (d) the costs of producing and distributing this Agreement
and any other related documents in connection with the offering, purchase, sale
and delivery of the Stock; (e) the filing fees incident to securing any
required review by the National Association of Securities Dealers, Inc. of the
terms of sale of the Stock; (f) any applicable listing or other fees; (g) the
fees and expenses of qualifying the Stock under the securities laws of the
several jurisdictions as provided in Section 6(h) and of preparing, printing
and distributing a Blue Sky Memorandum (including related fees and expenses of
counsel to the Underwriters); and (h) all other costs and expenses incident to
the performance of the obligations of the Company and the Selling Stockholder
under this Agreement; provided that, except as provided in this Section 8 and
in Section 13, the Underwriters shall pay their own costs and expenses,
including the costs and expenses of their counsel, any transfer taxes on the
Stock which they may sell, the expenses of advertising any offering of the
Stock made by the Underwriters and the expenses of the roadshow (excluding the
Company's air and rail transportation and lodging expenses), and the Selling
Stockholder shall pay the fees and expenses of its counsel, the costs of
delivering and distributing the Ancillary Documents, if any, and any transfer
taxes payable in connection with its sale of Stock to the Underwriters. The
provisions of this Section 8 shall not affect any agreement that the Company
and the Selling Stockholder have or may make for the sharing of the foregoing
costs and expenses.

                  9. Conditions of Underwriters' Obligations. The respective
obligations of the Underwriters hereunder are subject to the accuracy, when
made and on the Delivery Date, of the representations and warranties of the
Company and the Selling Stockholder contained herein, to the performance by the
Company and the Selling Stockholder of their obligations hereunder, and to each
of the following additional terms and conditions:

                           (a) The Prospectus shall have been timely filed with
                  the Commission in accordance with Section 6(a); no stop order
                  suspending the effectiveness of the Registration Statement or
                  any part thereof shall have been issued and no proceeding for
                  that purpose shall have been initiated or threatened by the
                  Commission; and any request of the Commission for inclusion
                  of additional information in the Registration Statement or
                  the Prospectus or otherwise shall have been complied with.

                           (b) No Underwriter shall have discovered and
                  disclosed to the Company on or prior to the Delivery Date
                  that the Registration Statement or the Prospectus or any
                  amendment or supplement thereto contains an untrue statement
                  of a fact which, in the opinion of Akin, Gump, Strauss, Hauer
                  & Feld, L.L.P., counsel for the Underwriters, is 


                                      14
<PAGE>   15

                  material or omits to state a fact which, in the opinion of
                  such counsel, is material and is required to be stated
                  therein or is necessary to make the statements therein not
                  misleading.

                           (c) All corporate proceedings and other legal
                  matters incident to the authorization, form and validity of
                  this Agreement, the Ancillary Documents, if any, the Stock,
                  the Registration Statement and the Prospectus, and all other
                  legal matters relating to this Agreement and the transactions
                  contemplated hereby shall be reasonably satisfactory in all
                  material respects to counsel for the Underwriters, and the
                  Company and the Selling Stockholder shall have furnished to
                  such counsel all documents and information that they may
                  reasonably request to enable them to pass upon such matters.

                           (d) Davis, Graham & Stubbs LLP shall have furnished
                  to the Representatives their written opinion, as counsel to
                  the Company, addressed to the Underwriters and dated the
                  Delivery Date, in form and substance reasonably satisfactory
                  to the Representatives, to the effect that:

                                    (i) The Company and each of the Significant
                           Subsidiaries have been duly incorporated and are
                           validly existing as corporations in good standing
                           under the laws of their respective jurisdictions of
                           incorporation, are duly qualified to do business and
                           are in good standing as foreign corporations in each
                           jurisdiction in which their respective ownership or
                           lease of property or the conduct of their respective
                           businesses requires such qualification (except where
                           the failure to so qualify or be in good standing
                           would not reasonably be expected to have a Material
                           Adverse Effect) and have all corporate power and
                           authority necessary to own or hold their respective
                           properties and conduct the businesses in which they
                           are engaged;

                                   (ii) The Company has an authorized
                           capitalization as set forth in the Prospectus, and
                           all of the issued shares of capital stock of the
                           Company (including the shares of Stock being
                           delivered on the Delivery Date) have been duly and
                           validly authorized and issued, are fully paid and
                           non-assessable and conform to the description
                           thereof contained or incorporated by reference in
                           the Prospectus and all of the issued shares of
                           capital stock of each subsidiary of the Company have
                           been duly and validly authorized and issued and are
                           fully paid, non-assessable and (except as disclosed
                           or incorporated by reference in the Prospectus and
                           for directors' qualifying shares) are owned directly
                           or indirectly by the Company, free and clear of all
                           perfected security interests and, to the knowledge
                           of such counsel, any other liens, encumbrances or
                           claims;

                                  (iii) There are no preemptive or other rights
                           to subscribe for or to purchase, nor any restriction
                           upon the voting or transfer of, any shares of the
                           Stock pursuant to the Company's charter or by-laws
                           or any agreement or other instrument of the Company
                           known to such counsel;



                                      15
<PAGE>   16

                                   (iv) To such counsel's knowledge, there are
                           no legal or governmental proceedings pending to
                           which the Company or any of its subsidiaries is a
                           party or of which any property or assets of the
                           Company or any of its subsidiaries is the subject
                           which, if determined adversely to the Company or any
                           of its subsidiaries, would likely have a Material
                           Adverse Effect; and, to such counsel's knowledge, no
                           such proceedings are threatened by governmental
                           authorities or threatened by others;

                                    (v) The Registration Statement was declared
                           effective under the Securities Act as of the date
                           and time specified in such opinion, the Prospectus
                           was filed with the Commission pursuant to the
                           subparagraph of Rule 424(b) of the Rules and
                           Regulations specified in such opinion on the date
                           specified therein and no stop order suspending the
                           effectiveness of the Registration Statement has been
                           issued and, to the knowledge of such counsel, no
                           proceeding for that purpose is pending or threatened
                           by the Commission;

                                   (vi) The Registration Statement and the
                           Prospectus and any further amendments or supplements
                           thereto made by the Company prior to the Delivery
                           Date (other than the financial statements and
                           related schedules therein, as to which such counsel
                           need express no opinion) comply as to form in all
                           material respects with the requirements of the
                           Securities Act and the Rules and Regulations; and
                           the documents incorporated by reference in the
                           Prospectus and any further amendment or supplement
                           to any such incorporated document made by the
                           Company prior to the Delivery Date (other than the
                           financial statements and related schedules therein,
                           as to which such counsel need express no opinion),
                           when they became effective or were filed with the
                           Commission, as the case may be, complied as to form
                           in all material respects with the requirements of
                           the Exchange Act and the rules and regulations of
                           the Commission thereunder;

                                  (vii) To such counsel's knowledge, there are
                           no contracts or other documents which are required
                           to be described in the Prospectus or filed as
                           exhibits to the Registration Statement by the
                           Securities Act or by the Rules and Regulations which
                           have not been described or filed as exhibits to the
                           Registration Statement or incorporated therein by
                           reference as permitted by the Rules and Regulations;

                                 (viii) This Agreement has been duly 
                           authorized,  executed and delivered by the Company;

                                   (ix) Neither the Company nor any subsidiary
                           is an "investment company" within the meaning of
                           such term under the Investment Company Act of 1940,
                           as amended, and the rules and regulations of the
                           Commission thereunder;



                                      16
<PAGE>   17

                                    (x)  The sale of the shares of Stock being
                           delivered on the Delivery Date by the Selling
                           Stockholder and the compliance by the Company with
                           its obligations under this Agreement and the
                           consummation of the transactions contemplated hereby
                           will not conflict with or result in a breach or
                           violation of any of the terms or provisions of, or
                           constitute a default under, any material indenture,
                           mortgage, deed of trust, loan agreement or other
                           agreement or instrument known to such counsel to
                           which the Company or any of its subsidiaries is a
                           party or by which the Company or any of its
                           subsidiaries is bound or to which any of the
                           property or assets of the Company or any of its
                           subsidiaries is subject, nor will such actions
                           result in any violation of the provisions of the
                           charter or by-laws of the Company or any of its
                           subsidiaries or any statute or any order, rule or
                           regulation known to such counsel of any court or
                           governmental agency or body having jurisdiction over
                           the Company or any of its subsidiaries or any of
                           their properties or assets; and, except for the
                           registration of the Stock under the Securities Act
                           and such consents, approvals, authorizations,
                           registrations or qualifications as may be required
                           under the Exchange Act and applicable state
                           securities laws in connection with the purchase and
                           distribution of the Stock by the Underwriters, no
                           consent, approval, authorization or order of, or
                           filing or registration with, any such court or
                           governmental agency or body is required for the
                           execution, delivery and performance of this
                           Agreement by the Company; and

                                   (xi) To such counsel's knowledge, there are
                           no contracts, agreements or understandings between
                           the Company and any person granting such person the
                           right (other than rights which have been waived,
                           satisfied or not exercised) to require the Company
                           to file a registration statement under the
                           Securities Act with respect to any securities of the
                           Company owned or to be owned by such person or to
                           require the Company to include such securities in
                           the securities registered pursuant to the
                           Registration Statement or in any securities being
                           registered pursuant to any other registration
                           statement filed by the Company under the Securities
                           Act.

                  In rendering such opinion, such counsel may (i) state that
                  their opinion is limited to matters governed by the Federal
                  laws of the United States of America, the laws of the State
                  of New York and the General Corporation Law of the State of
                  Delaware and that such counsel is not admitted in the State
                  of Delaware and (ii) rely as to matters of fact (but not
                  legal conclusions), to the extent they deem proper, on
                  certificates of responsible officers of the Company and
                  public officials. Such counsel shall also have furnished to
                  the Representatives a written statement, addressed to the
                  Underwriters and dated the Delivery Date, in form and
                  substance satisfactory to the Representatives, to the effect
                  that (i) such counsel has acted as counsel to the Company on
                  a regular basis (although the Company is also represented by
                  its General Counsel and, with respect to certain other
                  matters, by other outside counsel), has acted as counsel to
                  the Company in connection with previous financing
                  transactions and has acted as counsel 


                                      17
<PAGE>   18

                  to the Company in connection with the preparation of the
                  Registration Statement, and (ii) based on the foregoing, no
                  facts have come to the attention of such counsel which lead
                  them to believe that (A) the Registration Statement, as of
                  the Effective Date, contained any untrue statement of a
                  material fact or omitted to state a material fact required to
                  be stated therein or necessary in order to make the
                  statements therein not misleading, or that the Prospectus
                  contains any untrue statement of a material fact or omits to
                  state a material fact required to be stated therein or
                  necessary in order to make the statements therein, in light
                  of the circumstances under which they were made, not
                  misleading or (B) any document incorporated by reference in
                  the Prospectus or any further amendment or supplement to any
                  such incorporated document made by the Company prior to the
                  Delivery Date, when they became effective or were filed with
                  the Commission as the case may be, contained in the case of a
                  registration statement which became effective under the
                  Securities Act, any untrue statement of a material fact or
                  omitted to state a material fact required to be stated
                  therein or necessary in order to make the statements therein
                  not misleading, or, in the case of other documents which were
                  filed under the Exchange Act with the Commission, an untrue
                  statement of a material fact or omitted to state a material
                  fact necessary in order to make the statements therein, in
                  light of the circumstances under which they were made, not
                  misleading. Notwithstanding the foregoing, such counsel need
                  express no belief with respect to the financial statements,
                  financial schedules, other financial or statistical data
                  (including any reserve, production and cost data) and any
                  geologic information included in or incorporated by reference
                  in the Prospectus and any amendment or supplement thereto.

                           (e) The counsel for the Selling Stockholder shall
                  have furnished to the Representatives his written opinion, as
                  counsel to the Selling Stockholder, addressed to the
                  Underwriters and dated the Delivery Date, in form and
                  substance reasonably satisfactory to the Representatives, to
                  the effect that:

                                    (i) The Selling Stockholder has full right,
                           power and authority to enter into this Agreement and
                           the Ancillary Documents, if any; the execution,
                           delivery and performance of this Agreement and the
                           Ancillary Documents, if any, by the Selling
                           Stockholder and the consummation by the Selling
                           Stockholder of the transactions contemplated hereby
                           and thereby will not conflict with or result in a
                           breach or violation of any of the terms or
                           provisions of, or constitute a default under, any
                           statute, any indenture, mortgage, deed of trust,
                           loan agreement or other agreement or instrument
                           known to such counsel to which the Selling
                           Stockholder is a party or by which the Selling
                           Stockholder is bound or to which any of the property
                           or assets of the Selling Stockholder is subject, nor
                           will such actions result in any violation of the
                           provisions of the limited partnership agreement of
                           the Selling Stockholder or any statute or any order,
                           rule or regulation known to such counsel of any
                           court or governmental agency or body having
                           jurisdiction over the Selling Stockholder or the
                           property or assets of the Selling Stockholder; and,
                           except for the registration of the Stock under the
                           Securities Act and such consents, approvals,
                           authorizations, 


                                      18
<PAGE>   19

                           registrations or qualifications as may be required
                           under the Exchange Act and applicable state
                           securities laws in connection with the purchase and
                           distribution of the Stock by the Underwriters, no
                           consent, approval, authorization or order of, or
                           filing or registration with, any such court or
                           governmental agency or body is required for the
                           execution, delivery and performance of this
                           Agreement and the Ancillary Documents, if any, by
                           the Selling Stockholder and the consummation by the
                           Selling Stockholder of the transactions contemplated
                           hereby and thereby;

                                   (ii) This  Agreement  has been duly executed
                           and delivered by or on behalf of the Selling
                           Stockholder;

                                  (iii) The Ancillary Documents, if any, have
                           been duly executed and delivered by the Selling
                           Stockholder and constitute valid and binding
                           agreements of the Selling Stockholder, enforceable
                           in accordance with their respective terms;

                                   (iv) Immediately prior to the Delivery Date,
                           the Selling Stockholder had valid and marketable
                           title to the shares of Stock to be sold by the
                           Selling Stockholder under this Agreement, free and
                           clear of all liens, encumbrances, equities or
                           claims, and full right, power and authority to sell,
                           assign, transfer and deliver such shares to be sold
                           by the Selling Stockholder hereunder; and

                                    (v) Valid and marketable title to the
                           shares of Stock to be sold by the Selling
                           Stockholder under this Agreement, free and clear of
                           all liens, encumbrances, equities or claims, has
                           been transferred to each of the several Underwriters
                           who have purchased such Stock pursuant to the
                           provisions of this Agreement.

                  In rendering such opinion, such counsel may (i) state that
                  his opinion is limited to matters governed by the Federal
                  laws of the United States of America, the laws of the State
                  of Texas and the Delaware Revised Uniform Limited Partnership
                  Act and that such counsel is not admitted in the State of
                  Delaware and (ii) in rendering the opinion in Section
                  9(e)(iv) above, rely upon a certificate of the Selling
                  Stockholder in respect of matters of fact as to ownership of
                  and liens, encumbrances, equities or claims on the shares of
                  Stock sold by the Selling Stockholder, provided that such
                  counsel shall furnish copies thereof to the Representatives
                  and state that he believes that both he and the Underwriters
                  are justified in relying upon such certificate. Such counsel
                  shall also have furnished to the Representatives a written
                  statement, addressed to the Underwriters and dated the
                  Delivery Date, in form and substance satisfactory to the
                  Representatives, to the effect that (A) such counsel has
                  acted as counsel to the Selling Stockholder on a regular
                  basis and has acted as counsel to the Selling Stockholder in
                  connection with the preparation of the Registration
                  Statement, and (B) based on the foregoing, no facts have come
                  to the attention of such counsel which lead him to believe
                  that the Registration Statement, as of the Effective Date,
                  contained any untrue 


                                      19
<PAGE>   20

                  statement of a material fact relating to the Selling
                  Stockholder or omitted to state such a material fact required
                  to be stated therein or necessary in order to make the
                  statements therein relating to the Selling Stockholder not
                  misleading, or that the Prospectus contains any untrue
                  statement of a material fact relating to the Selling
                  Stockholder or omits to state such a material fact required
                  to be stated therein or necessary in order to make the
                  statements therein relating to the Selling Stockholder, in
                  light of the circumstances under which they were made, not
                  misleading. The foregoing opinion and statement may be
                  qualified by a statement to the effect that such counsel does
                  not assume any responsibility for the accuracy or
                  completeness of the statements contained in the Registration
                  Statement or the Prospectus.

                           (f) The Representatives shall have received from
                  Akin, Gump, Strauss, Hauer & Feld, LLP, counsel for the
                  Underwriters, such opinion or opinions, dated the Delivery
                  Date, with respect to the issuance and sale of the Stock, the
                  Registration Statement, the Prospectus and other related
                  matters as the Representatives may reasonably require, and
                  the Company shall have furnished to such counsel such
                  documents as they reasonably request for the purpose of
                  enabling them to pass upon such matters.

                           (g) At the time of execution of this Agreement, the
                  Representatives shall have received from Arthur Andersen LLP
                  a letter, in form and substance satisfactory to the
                  Representatives, addressed to the Underwriters and dated the
                  date hereof (i) confirming that they are independent public
                  accountants within the meaning of the Securities Act and are
                  in compliance with the applicable requirements relating to
                  the qualification of accountants under Rule 2-01 of
                  Regulation S-X of the Commission, (ii) stating, as of the
                  date hereof (or, with respect to matters involving changes or
                  developments since the respective dates as of which specified
                  financial information is given in the Prospectus, as of a
                  date not more than three days prior to the date hereof), the
                  conclusions and findings of such firm with respect to the
                  financial information and other matters ordinarily covered by
                  accountants' "comfort letters" to underwriters in connection
                  with registered public offerings.

                           (h) With respect to the letter of Arthur Andersen
                  LLP referred to in the preceding paragraph and delivered to
                  the Representatives concurrently with the execution of this
                  Agreement (the "initial letter"), the Company shall have
                  furnished to the Representatives a letter (the "bring-down
                  letter") of such accountants, addressed to the Underwriters
                  and dated the Delivery Date (i) confirming that they are
                  independent public accountants within the meaning of the
                  Securities Act and are in compliance with the applicable
                  requirements relating to the qualification of accountants
                  under Rule 2-01 of Regulation S-X of the Commission, (ii)
                  stating, as of the date of the bring-down letter (or, with
                  respect to matters involving changes or developments since
                  the respective dates as of which specified financial
                  information is given in the Prospectus, as of a date not more
                  than three days prior to the date of the bring-down letter),
                  the conclusions and findings of such firm with respect to the
                  financial information and 


                                      20
<PAGE>   21

                  other matters covered by the initial letter and (iii)
                  confirming in all material respects the conclusions and
                  findings set forth in the initial letter.

                           (i) The Company shall have furnished to the
                  Representatives a certificate, dated the Delivery Date, of
                  its Chairman of the Board, its President or a Vice President
                  and its chief financial officer stating that:

                                    (i) The representations, warranties and
                           agreements of the Company in Section 1 are true and
                           correct as of the Delivery Date; the Company has
                           complied with all its agreements contained herein;
                           and the conditions set forth in Sections 9(a) and
                           9(k) have been fulfilled; and

                                   (ii) They have carefully examined the
                           Registration Statement and the Prospectus and, in
                           their opinion (A) as of the Effective Date, the
                           Registration Statement and Prospectus did not
                           include any untrue statement of a material fact and
                           did not omit to state a material fact required to be
                           stated therein or necessary to make the statements
                           therein not misleading, and (B) since the Effective
                           Date no event has occurred which is required under
                           the Securities Act to be set forth in a supplement
                           or amendment to the Registration Statement or the
                           Prospectus.

                           (j) The Selling Stockholder shall have furnished to
                  the Representatives on the Delivery Date a certificate, dated
                  the Delivery Date, signed by, or on behalf of, the Selling
                  Stockholder stating that the representations, warranties and
                  agreements of the Selling Stockholder contained herein are
                  true and correct as of the Delivery Date and that the Selling
                  Stockholder has complied with all agreements contained herein
                  to be performed by the Selling Stockholder at or prior to the
                  Delivery Date.

                           (k) (i) Neither the Company nor any of its
                  subsidiaries shall have sustained since the date hereof or
                  the respective dates as of which information is given in the
                  Prospectus any loss or interference with its business from
                  fire, explosion, flood or other calamity, whether or not
                  covered by insurance, or from any labor dispute or court or
                  governmental action, order or decree, otherwise than as set
                  forth or incorporated by reference in the Prospectus, except
                  such losses, interferences, disputes, actions, orders or
                  decrees that do not individually or in the aggregate have a
                  Material Adverse Effect or (ii) since such dates there shall
                  not have been any material change in the capital stock or
                  long-term debt of the Company or any of its subsidiaries or
                  any change, or any development involving a prospective
                  change, in or affecting the general affairs, management,
                  financial position, stockholders' equity or results of
                  operations of the Company and its subsidiaries, otherwise
                  than as set forth or incorporated by reference in the
                  Prospectus, the effect of which, in any such case described
                  in clause (i) or (ii), is, in the judgment of the
                  Representatives, so material and adverse as to make it
                  impracticable or inadvisable to proceed with the public
                  offering or the delivery of the Stock being delivered on the
                  Delivery Date on the terms and in the manner contemplated in
                  the Prospectus.



                                      21
<PAGE>   22

                           (l) Subsequent to the execution and delivery of this
                  Agreement there shall not have occurred any of the following:
                  (i) trading in securities generally on the New York Stock
                  Exchange or the American Stock Exchange or in the
                  over-the-counter market, or trading in any securities of the
                  Company on any exchange or in the over-the-counter market,
                  shall have been suspended or minimum prices shall have been
                  established on any such exchange or such market by the
                  Commission, by such exchange or by any other regulatory body
                  or governmental authority having jurisdiction, (ii) a banking
                  moratorium shall have been declared by Federal or state
                  authorities, (iii) the United States shall have become
                  engaged in hostilities, there shall have been an escalation
                  in hostilities involving the United States or there shall
                  have been a declaration of a national emergency or war by the
                  United States or (iv) there shall have occurred such a
                  material adverse change in general economic, political or
                  financial conditions (or the effect of international
                  conditions on the financial markets in the United States
                  shall be such) as to make it, in the judgment of a majority
                  in interest of the several Underwriters, impracticable or
                  inadvisable to proceed with the public offering or delivery
                  of the Stock being delivered on the Delivery Date on the
                  terms and in the manner contemplated in the Prospectus.

                           (m) The New York Stock Exchange, Inc. shall have
                  approved the Stock for listing, subject only to official
                  notice of issuance.

                  All opinions, letters, evidence and certificates mentioned
above or elsewhere in this Agreement shall be deemed to be in compliance with
the provisions hereof only if they are in form and substance reasonably
satisfactory to counsel for the Underwriters.

                  10. Indemnification and Contribution.

                           (a) The Company and Orion Acquisition, Inc., HSRTW,
                  Inc. and HS Energy Services, Inc., its principal operating
                  subsidiaries (the "Principal Subsidiaries") jointly and
                  severally, shall indemnify and hold harmless each
                  Underwriter, its officers and employees and each person, if
                  any, who controls any Underwriter within the meaning of the
                  Securities Act, from and against any loss, claim, damage or
                  liability, joint or several, or any action in respect thereof
                  (including, but not limited to, any loss, claim, damage,
                  liability or action relating to purchases and sales of
                  Stock), to which that Underwriter, officer, employee or
                  controlling person may become subject, under the Securities
                  Act or otherwise, insofar as such loss, claim, damage,
                  liability or action arises out of, or is based upon, (i) any
                  untrue statement or alleged untrue statement of a material
                  fact contained (A) in any Preliminary Prospectus, the
                  Registration Statement or the Prospectus or in any amendment
                  or supplement thereto or (B) in any blue sky application or
                  other document prepared or executed by the Company (or based
                  upon any written information furnished by the Company)
                  specifically for the purpose of qualifying any or all of the
                  Stock under the securities laws of any state or other
                  jurisdiction (any such application, document or information
                  being hereinafter called a "Blue Sky Application"), or (ii)
                  the omission or alleged omission to state in any 


                                      22
<PAGE>   23

                  Preliminary Prospectus, the Registration Statement or the
                  Prospectus, or in any amendment or supplement thereto, or in
                  any Blue Sky Application any material fact required to be
                  stated therein or necessary to make the statements therein
                  not misleading; provided, however, that the Company and the
                  Principal Subsidiaries shall not be liable in any such case
                  to the extent that any such loss, claim, damage, liability or
                  action arises out of, or is based upon, any untrue statement
                  or alleged untrue statement or omission or alleged omission
                  made in any Preliminary Prospectus, the Registration
                  Statement or the Prospectus, or in any such amendment or
                  supplement, or in any Blue Sky Application, in reliance upon
                  and in conformity with written information concerning such
                  Underwriter furnished to the Company through the
                  Representatives by or on behalf of any Underwriter
                  specifically for inclusion therein. The foregoing indemnity
                  agreement is in addition to any liability which the Company
                  or the Principal Subsidiaries may otherwise have to any
                  Underwriter or to any officer, employee or controlling person
                  of that Underwriter.

                           (b) The Selling Stockholder shall indemnify and hold
                  harmless each Underwriter, its officers and employees, and
                  each person, if any, who controls any Underwriter within the
                  meaning of the Securities Act, from and against any loss,
                  claim, damage or liability, joint or several, or any action
                  in respect thereof (including, but not limited to, any loss,
                  claim, damage, liability or action relating to purchases and
                  sales of Stock), to which that Underwriter, officer, employee
                  or controlling person may become subject, under the
                  Securities Act or otherwise, insofar as such loss, claim,
                  damage, liability or action arises out of, or is based upon,
                  (i) any untrue statement or alleged untrue statement of a
                  material fact contained in any Preliminary Prospectus, the
                  Registration Statement or the Prospectus or in any amendment
                  or supplement thereto or (ii) the omission or alleged
                  omission to state in any Preliminary Prospectus, Registration
                  Statement or the Prospectus, or in any amendment or
                  supplement thereto, any material fact required to be stated
                  therein or necessary to make the statements therein not
                  misleading, and shall reimburse each Underwriter, its
                  officers and employees and each such controlling person for
                  any legal or other expenses reasonably incurred by that
                  Underwriter, its officers and employees or controlling person
                  in connection with investigating or defending or preparing to
                  defend against any such loss, claim, damage, liability or
                  action as such expenses are incurred; provided, however, that
                  the Selling Stockholder shall be obligated under this Section
                  10(b) to indemnify and hold harmless and reimburse the
                  expenses of each Underwriter, its officers and employees and
                  each person, if any, who controls any Underwriter within the
                  meaning of the Securities Act, only to the extent that such
                  loss, claim, damage or action arises out of, or is based
                  upon, any untrue statement or omission or alleged untrue
                  statement or omission of a material fact made in reliance
                  upon and in conformity with written information furnished to
                  the Company by such Selling Stockholder ("Selling Stockholder
                  Information") expressly for use in any Preliminary
                  Prospectus, the Registration Statement, or the Prospectus or
                  in any such amendment or supplement; provided, further, that
                  the Selling Stockholder shall not be liable in any such case
                  to the extent that any such loss, claim, damage, liability or
                  action arises out of, or is based upon, any untrue statement
                  or alleged untrue statement or omission or 


                                      23
<PAGE>   24

                  alleged omission made in any Preliminary Prospectus, the
                  Registration Statement or the Prospectus or in any such
                  amendment or supplement in reliance upon and in conformity
                  with written information concerning such Underwriter
                  furnished to the Company through the Representatives by or on
                  behalf of any Underwriter specifically for inclusion therein.
                  The foregoing indemnity agreement is in addition to any
                  liability which the Selling Stockholder may otherwise have to
                  any Underwriter or any officer, employee or controlling
                  person of that Underwriter.

                           (c) Each Underwriter, severally and not jointly,
                  shall indemnify and hold harmless the Company, its officers
                  and employees, each of its directors, and each person, if
                  any, who controls the Company within the meaning of the
                  Securities Act, from and against any loss, claim, damage or
                  liability, joint or several, or any action in respect
                  thereof, to which the Company or any such director, officer,
                  employee or controlling person may become subject, under the
                  Securities Act or otherwise, insofar as such loss, claim,
                  damage, liability or action arises out of, or is based upon,
                  (i) any untrue statement or alleged untrue statement of a
                  material fact contained (A) in any Preliminary Prospectus,
                  the Registration Statement or the Prospectus or in any
                  amendment or supplement thereto, or (B) in any Blue Sky
                  Application or (ii) the omission or alleged omission to state
                  in any Preliminary Prospectus, the Registration Statement or
                  the Prospectus, or in any amendment or supplement thereto, or
                  in any Blue Sky Application any material fact required to be
                  stated therein or necessary to make the statements therein
                  not misleading, but in each case only to the extent that the
                  untrue statement or alleged untrue statement or omission or
                  alleged omission was made in reliance upon and in conformity
                  with written information concerning such Underwriter
                  furnished to the Company through the Representatives by or on
                  behalf of that Underwriter specifically for inclusion
                  therein, and shall reimburse the Company and any such
                  director, officer, employee or controlling person for any
                  legal or other expenses reasonably incurred by the Company or
                  any such director, officer, employee or controlling person in
                  connection with investigating or defending or preparing to
                  defend against any such loss, claim, damage, liability or
                  action as such expenses are incurred. The foregoing indemnity
                  agreement is in addition to any liability which any
                  Underwriter may otherwise have to the Company or any such
                  director, officer, employee or controlling person.

                           (d) Promptly after receipt by an indemnified party
                  under this Section 10 of notice of any claim or the
                  commencement of any action, the indemnified party shall, if a
                  claim in respect thereof is to be made against the
                  indemnifying party under this Section 10, notify the
                  indemnifying party in writing of the claim or the
                  commencement of that action; provided, however, that the
                  failure to notify the indemnifying party shall not relieve it
                  from any liability which it may have under this Section 10
                  except to the extent it has been materially prejudiced by
                  such failure and, provided further, that the failure to
                  notify the indemnifying party shall not relieve it from any
                  liability which it may have to an indemnified party otherwise
                  than under this Section 10. If any such claim or action shall
                  be brought against an indemnified party, and it shall notify
                  the indemnifying party thereof, the indemnifying party shall
                  be entitled to participate therein and, to the 


                                      24
<PAGE>   25

                  extent that it wishes, jointly with any other similarly
                  notified indemnifying party, to assume the defense thereof
                  with counsel reasonably satisfactory to the indemnified
                  party. After notice from the indemnifying party to the
                  indemnified party of its election to assume the defense of
                  such claim or action, the indemnifying party shall not be
                  liable to the indemnified party under this Section 10 for any
                  legal or other expenses subsequently incurred by the
                  indemnified party in connection with the defense thereof
                  other than reasonable costs of investigation; provided,
                  however, that the indemnified party shall have the right to
                  employ counsel to represent such indemnified party if the
                  indemnified party shall have been advised by counsel that
                  there may be legal defenses available to it which are
                  different from or in addition to those available to such
                  indemnifying party, and in that event the fees and expenses
                  of such separate counsel shall be paid by the indemnifying
                  party. No indemnifying party shall (i) without the prior
                  written consent of the indemnified parties (which consent
                  shall not be unreasonably withheld), settle or compromise or
                  consent to the entry of any judgment with respect to any
                  pending or threatened claim, action, suit or proceeding in
                  respect of which indemnification or contribution may be
                  sought hereunder (whether or not the indemnified parties are
                  actual or potential parties to such claim or action) unless
                  such settlement, compromise or consent includes an
                  unconditional release of each indemnified party from all
                  liability arising out of such claim, action, suit or
                  proceeding, or (ii) be liable for any settlement of any such
                  action effected without its written consent (which consent
                  shall not be unreasonably withheld), but if settled with the
                  consent of the indemnifying party or if there be a final
                  judgment of the plaintiff in any such action, the
                  indemnifying party agrees to indemnify and hold harmless any
                  indemnified party from and against any loss or liability by
                  reason of such settlement or judgment.

                           (e) If the indemnification provided for in this
                  Section 10 shall for any reason be unavailable to or
                  insufficient to hold harmless an indemnified party under
                  Section 10(a), 10(b) or 10(c) in respect of any loss, claim,
                  damage or liability, or any action in respect thereof,
                  referred to therein, then each indemnifying party shall, in
                  lieu of indemnifying such indemnified party, contribute to
                  the amount paid or payable by such indemnified party as a
                  result of such loss, claim, damage or liability, or action in
                  respect thereof, (i) in such proportion as shall be
                  appropriate to reflect the relative benefits received by the
                  Company, the Principal Subsidiaries and the Selling
                  Stockholder on the one hand and the Underwriters on the other
                  from the offering of the Stock or (ii) if the allocation
                  provided by clause (i) above is not permitted by applicable
                  law, in such proportion as is appropriate to reflect not only
                  the relative benefits referred to in clause (i) above but
                  also the relative fault of the Company, the Principal
                  Subsidiaries, and the Selling Stockholder on the one hand and
                  the Underwriters on the other with respect to the statements
                  or omissions which resulted in such loss, claim, damage or
                  liability, or action in respect thereof, as well as any other
                  relevant equitable considerations; provided, however, that
                  the Selling Stockholder shall have an obligation to
                  contribute under this Section 10(e) only with respect to
                  losses, liabilities, claims, damages or expenses arising out
                  of an untrue statement or omission or alleged untrue
                  statement or omission of a material fact made in reliance
                  upon and in conformity with Selling 


                                      25
<PAGE>   26

                  Stockholder Information. The relative benefits received by
                  the Company, the Principal Subsidiaries, and the Selling
                  Stockholder on the one hand and the Underwriters on the other
                  with respect to such offering shall be deemed to be in the
                  same proportion as the total net proceeds from the offering
                  of the Stock purchased under this Agreement (before deducting
                  expenses) received by the Company, the Principal
                  Subsidiaries, and the Selling Stockholder, on the one hand,
                  and the total underwriting discounts and commissions received
                  by the Underwriters with respect to the shares of the Stock
                  purchased under this Agreement, on the other hand, bear to
                  the total gross proceeds from the offering of the shares of
                  the Stock under this Agreement, in each case as set forth in
                  the table on the cover page of the Prospectus. The relative
                  fault shall be determined by reference to whether the untrue
                  or alleged untrue statement of a material fact or omission or
                  alleged omission to state a material fact relates to
                  information supplied by the Company, the Principal
                  Subsidiaries, the Selling Stockholder or the Underwriters,
                  the intent of the parties and their relative knowledge,
                  access to information and opportunity to correct or prevent
                  such statement or omission. For purposes of the preceding two
                  sentences, the net proceeds deemed to be received by the
                  Company shall be deemed to be also for the benefit of the
                  Principal Subsidiaries and information supplied by the
                  Company shall also be deemed to have been supplied by the
                  Principal Subsidiaries. The Company, the Principal
                  Subsidiaries, the Selling Stockholder and the Underwriters
                  agree that it would not be just and equitable if
                  contributions pursuant to this Section 10(e) were to be
                  determined by pro rata allocation (even if the Underwriters
                  were treated as one entity for such purpose) or by any other
                  method of allocation which does not take into account the
                  equitable considerations referred to herein. The amount paid
                  or payable by an indemnified party as a result of the loss,
                  claim, damage or liability, or action in respect thereof,
                  referred to above in this Section shall be deemed to include,
                  for purposes of this Section 10(e), any legal or other
                  expenses reasonably incurred by such indemnified party in
                  connection with investigating or defending any such action or
                  claim. Notwithstanding the provisions of this Section 10(e),
                  no Underwriter shall be required to contribute any amount in
                  excess of the amount by which the total price at which the
                  Stock underwritten by it and distributed to the public was
                  offered to the public exceeds the amount of any damages which
                  such Underwriter has otherwise paid or become liable to pay
                  by reason of any untrue or alleged untrue statement or
                  omission or alleged omission. No person guilty of fraudulent
                  misrepresentation (within the meaning of Section 11(f) of the
                  Securities Act) shall be entitled to contribution from any
                  person who was not guilty of such fraudulent
                  misrepresentation. The Underwriters' obligations to
                  contribute as provided in this Section 10(e) are several in
                  proportion to their respective underwriting obligations and
                  not joint.

                           (f) The Underwriters severally confirm and the
                  Company acknowledges that the statements with respect to the
                  public offering of the Stock by the Underwriters set forth on
                  the cover page of, the legend concerning stabilization on the
                  inside front cover page of and the information under the
                  caption "Underwriting" in, the Prospectus are correct and
                  constitute the only information concerning such Underwriters
                  furnished in 


                                      26
<PAGE>   27

                  writing to the Company by or on behalf of the Underwriters
                  specifically for inclusion in the Registration Statement and
                  the Prospectus.

                  11. Defaulting Underwriters. If, on the Delivery Date, any
Underwriter defaults in the performance of its obligations under this
Agreement, the remaining non-defaulting Underwriters shall be obligated to
purchase the Stock which the defaulting Underwriter agreed but failed to
purchase on the Delivery Date in the respective proportions which the number of
shares of the Stock set opposite the name of each remaining non-defaulting
Underwriter in Schedule 1 hereto bears to the total number of shares of the
Stock set opposite the names of all the remaining non-defaulting Underwriters
in Schedule 1 hereto; provided, however, that the remaining non-defaulting
Underwriters shall not be obligated to purchase any of the Stock on the
Delivery Date if the total number of shares of the Stock which the defaulting
Underwriter or Underwriters agreed but failed to purchase on such date exceeds
10% of the total number of shares of the Stock to be purchased on the Delivery
Date, and any remaining non-defaulting Underwriter shall not be obligated to
purchase more than 110% of the number of shares of the Stock which it agreed to
purchase on the Delivery Date pursuant to the terms of Section 3. If the
foregoing maximums are exceeded, the remaining non-defaulting Underwriters, or
those other underwriters satisfactory to the Representatives who so agree,
shall have the right, but shall not be obligated, to purchase, in such
proportion as may be agreed upon among them, all the Stock to be purchased on
the Delivery Date. If the remaining Underwriters or other underwriters
satisfactory to the Representatives do not elect to purchase the shares which
the defaulting Underwriter or Underwriters agreed but failed to purchase on the
Delivery Date, this Agreement shall terminate without liability on the part of
any non-defaulting Underwriter or the Company or the Selling Stockholder,
except that the Company will continue to be liable for the payment of expenses
to the extent set forth in Sections 8 and 13. As used in this Agreement, the
term "Underwriter" includes, for all purposes of this Agreement unless the
context requires otherwise, any party not listed in Schedule 1 hereto who,
pursuant to this Section 11, purchases Stock which a defaulting Underwriter
agreed but failed to purchase.

                  Nothing contained herein shall relieve a defaulting
Underwriter of any liability it may have to the Company and the Selling
Stockholder for damages caused by its default. If other underwriters are
obligated or agree to purchase the Stock of a defaulting or withdrawing
Underwriter, either the Representatives or the Company may postpone the
Delivery Date for up to seven full business days in order to effect any changes
that in the opinion of counsel for the Company or counsel for the Underwriters
may be necessary in the Registration Statement, the Prospectus or in any other
document or arrangement.

                  12. Termination. The obligations of the Underwriters
hereunder may be terminated by the Representatives by notice given to and
received by the Company and the Selling Stockholder prior to delivery of and
payment for the Stock if, prior to that time, any of the events described in
Sections 9(k) or 9(l), shall have occurred or if the Underwriters shall decline
to purchase the Stock for any reason permitted under this Agreement.

                  13. Reimbursement of Underwriters' Expenses. If the Selling
Stockholder shall fail to tender the Stock for delivery to the Underwriters by
reason of any failure, refusal or inability on the part of the Company or the
Selling Stockholder to perform any agreement on its part to be 


                                      27
<PAGE>   28

performed, or because any other condition of the Underwriters' obligations
hereunder required to be fulfilled by the Company or the Selling Stockholder is
not fulfilled, the Company and the Selling Stockholder will reimburse the
Underwriters for all reasonable out-of-pocket expenses (including fees and
disbursements of counsel) incurred by the Underwriters in connection with this
Agreement and the proposed purchase of the Stock, and upon demand the Company
and the Selling Stockholder shall pay the full amount thereof to the
Representatives. If this Agreement is terminated pursuant to Section 11 by
reason of the default of one or more Underwriters, neither the Company nor the
Selling Stockholder shall be obligated to reimburse any defaulting Underwriter
on account of those expenses.

                  14. Notices, etc. All statements, requests, notices and
agreements hereunder shall be in writing, and:

                           (a) if to the Underwriters, shall be delivered or
                  sent by mail, telex or facsimile transmission to Lehman
                  Brothers Inc., Three World Financial Center, New York, New
                  York 10285, Attention: Syndicate Department (Fax:
                  212-526-6588), with a copy, in the case of any notice
                  pursuant to Section 10(d), to the Director of Litigation,
                  Office of the General Counsel, Lehman Brothers Inc., 3 World
                  Financial Center, 10th Floor, New York, NY 10285;

                           (b) if to the Company or to the Principal
                  Subsidiaries, shall be delivered or sent by mail, telex or
                  facsimile transmission to the address of the Company set
                  forth in the Registration Statement, Attention: James M.
                  Piccone, Esq. (Fax: (303) 296-3601); and

                           (c) if to the Selling Stockholder, shall be
                  delivered or sent by mail, telex or facsimile transmission to
                  the Selling Stockholder at the address set forth on Schedule
                  2 hereto;

provided, however, that any notice to an Underwriter pursuant to Section 10(d)
shall be delivered or sent by mail, telex or facsimile transmission to such
Underwriter at its address set forth in its acceptance telex to the
Representatives, which address will be supplied to any other party hereto by
the Representatives upon request. Any such statements, requests, notices or
agreements shall take effect at the time of receipt thereof. The Company and
the Selling Stockholder shall be entitled to act and rely upon any request,
consent, notice or agreement given or made on behalf of the Underwriters by
Lehman Brothers Inc.

                  15. Persons Entitled to Benefit of Agreement. This Agreement
shall inure to the benefit of and be binding upon the Underwriters, the
Company, the Selling Stockholder and their respective successors. This
Agreement and the terms and provisions hereof are for the sole benefit of only
those persons, except that (a) the representations, warranties, indemnities and
agreements of the Company and the Selling Stockholder contained in this
Agreement shall also be deemed to be for the benefit of the person or persons,
if any, who control any Underwriter within the meaning of Section 15 of the
Securities Act (b) the indemnity agreement of the Underwriters contained in
Section 10(c) of this Agreement shall be deemed to be for the benefit of
directors of the Company, officers of the Company who have signed the
Registration Statement and any person controlling the Company within the


                                      28
<PAGE>   29

meaning of Section 15 of the Securities Act. Nothing in this Agreement is
intended or shall be construed to give any person, other than the persons
referred to in this Section 15, any legal or equitable right, remedy or claim
under or in respect of this Agreement or any provision contained herein.

                  16. Survival. The respective indemnities, representations,
warranties and agreements of the Company, the Principal Subsidiaries, the
Selling Stockholder and the Underwriters contained in this Agreement or made by
or on behalf on them, respectively, pursuant to this Agreement, shall survive
the delivery of and payment for the Stock and shall remain in full force and
effect, regardless of any investigation made by or on behalf of any of them or
any person controlling any of them.

                  17. Definition of the Terms "Business Day" and "Subsidiary".
For purposes of this Agreement, (a) "business day" means any day on which the
New York Stock Exchange, Inc. is open for trading and (b) "subsidiary" has the
meaning set forth in Rule 405 of the Rules and Regulations.

                  18. Governing Law. This Agreement shall be governed by and
construed in accordance with the laws of New York.

                  19. Counterparts. This Agreement may be executed in one or
more counterparts and, if executed in more than one counterpart, the executed
counterparts shall each be deemed to be an original but all such counterparts
shall together constitute one and the same instrument.

                  20. Headings. The headings herein are inserted for
convenience of reference only and are not intended to be part of, or to affect
the meaning or interpretation of, this Agreement.


           [The remainder of this page is intentionally left blank.]


                                      29
<PAGE>   30

                  If the foregoing correctly sets forth the agreement among the
Company, the Principal Subsidiaries, the Selling Stockholder and the
Underwriters, please indicate your acceptance in the space provided for that
purpose below.

                                       Very truly yours,

                                       HS RESOURCES, INC.


   
                                       By: /s/ Nicholas J. Sutton
                                           -----------------------------------
                                           Nicholas J. Sutton
                                           Chief Executive Officer


                                       ORION ACQUISITION, INC., a Principal 
                                       Subsidiary


                                       By: /s/ Nicholas J. Sutton
                                           -----------------------------------
                                           Nicholas J. Sutton
                                           Chief Executive Officer


                                       HSRTW, INC., a Principal Subsidiary


                                       By: /s/ Nicholas J. Sutton
                                           -----------------------------------
                                           Nicholas J. Sutton
                                           Chief Executive Officer


                                       HS ENERGY SERVICES, INC., a Principal 
                                       Subsidiary


                                       By: /s/ Nicholas J. Sutton
                                           -----------------------------------
                                           Nicholas J. Sutton
                                           Chief Executive Officer
    


                                      S-1
<PAGE>   31

                                       The Selling Stockholder:

                                       NATURAL GAS PARTNERS, L.P.

                                       By:  G.F.W. Energy, L.P.
                                            Its: General Partner


   
                                            By: /s/ David R. Albin
                                                ------------------------------
                                                David R. Albin
                                                Authorized Signatory
    


Accepted:

Lehman Brothers Inc.

   
By /s/ Glen C. Warren
   -------------------------
   Authorized Representative
    

For itself and as Representative
of the several Underwriters named
in Schedule 1 hereto


                                      S-2
<PAGE>   32

                                   SCHEDULE 1


<TABLE>
<CAPTION>
                                                               Number of
Underwriters                                                    Shares
- ------------                                                   ---------
<S>                                                            <C>    
Lehman Brothers Inc. .......................................     616,670
Merrill Lynch, Pierce, Fenner & Smith Incorporated .........     616,670
Petrie Parkman & Co. .......................................     616,670
                                                               ---------

         Total .............................................   1,850,010
                                                               =========
</TABLE>


<PAGE>   33

                                   SCHEDULE 2


<TABLE>
<CAPTION>
                                                            Number of Shares
Name and address of Selling Stockholder                        of Stock
- ---------------------------------------                     ----------------
<S>                                                         <C>      
Natural Gas Partners, L.P. .................................   1,850,010
777 Main Street, Suite 2700
Ft. Worth, TX 76102-5304

         Total .............................................   1,850,010
</TABLE>


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