ATP OIL & GAS CORP
S-1/A, EX-1.1, 2001-01-12
CRUDE PETROLEUM & NATURAL GAS
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                                                                     EXHIBIT 1.1

                                7,500,000 SHARES

                           ATP OIL & GAS CORPORATION

                                  COMMON STOCK

                             UNDERWRITING AGREEMENT
                             ----------------------



Lehman Brothers Inc.                                            __________, 2001
CIBC World Markets Corp.
Dain Rauscher Incorporated
Raymond James & Associates, Inc.
Fidelity Capital Markets,
  a division of National
  Financial Services LLC
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:

  ATP Oil & Gas Corporation, a Texas corporation (the "Company"), proposes to
sell 7,500,000 shares (the "Firm Shares") of the Company's common stock, par
value $.001 per share (the "Common Stock"), to the several Underwriters named in
Schedule 1 hereto (the "Underwriters").  In addition, certain shareholders of
the Company named in Schedule 2 hereto (the "Selling Shareholders") propose to
grant to the Underwriters an option to purchase up to an additional 1,125,000
shares of Common Stock on the terms and for the purposes set forth in Section 3
(the "Option Shares").  The Firm Shares and the Option Shares, if purchased, are
hereinafter collectively called the "Shares."  This is to confirm the agreement
concerning the purchase of the Shares from the Company by the Underwriters.

  1. Representations and Warranties of the Company. The Company represents and
warrants to, and agrees with, each Underwriter that:

(a)  A registration statement on Form S-1 (File No. 333-46034) with respect to
     the Shares (i) has been prepared by the Company in conformity with the
     requirements of the Securities Act of 1933, as amended (the "Securities
     Act"), and the rules and regulations (the "Rules and Regulations") of the
     Securities and Exchange Commission (the "Commission") thereunder, (ii) has
     been filed with the Commission under the Securities Act and (iii) either
     has become effective under the Securities Act and is not proposed to be
     amended or is proposed to be amended by amendment or post-effective
     amendment.  If the Company does not propose to
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     amend such registration statement and if any post-effective amendment to
     such registration statement has been filed with the Commission prior to the
     execution and delivery of this Agreement, the most recent such amendment
     has been declared effective by the Commission. Copies of such registration
     statement as amended to date have been delivered by the Company to you as
     the representatives (the "Representatives") of the Underwriters. As used in
     this Agreement, "Effective Time" means the date and the time as of which
     such 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; "Preliminary Prospectus" means each
     prospectus included in such registration statement, or amendments thereof,
     before it became effective under the Securities Act and any prospectus
     filed with the Commission by the Company with the consent of the
     Representatives pursuant to Rule 424(a) of the Rules and Regulations;
     "Registration Statement" means such registration statement, as amended at
     the Effective Time, including, if the Effective Date is on or before the
     date of this Agreement, all information contained in the final prospectus
     filed with the Commission pursuant to Rule 424(b) of the Rules and
     Regulations ("Rule 424(b)") in accordance with Section 6(a) hereof and
     deemed to be a part thereof as of the Effective Time pursuant to paragraph
     (b) of Rule 430A of the Rules and Regulations; and "Prospectus" means such
     final prospectus, as first filed with the Commission pursuant to paragraph
     (1) or (4) of Rule 424(b) or, if the Effective Date is after the date of
     this Agreement, the final prospectus in the form heretofore delivered by
     the Company to the Representatives, with any changes made thereto by the
     Company with the consent of the Representatives, as the case may be. If it
     is contemplated at the time this Agreement is executed that a registration
     statement or a post-effective amendment will be filed pursuant to Rule
     462(b) or 462(d) under the Securities Act before the offering of the Common
     Stock may commence, the term "Registration Statement" as used in this
     Agreement includes such registration statement or amendment.

(b)  If the Effective Date is on or before the date of this Agreement, (i) the
     Registration Statement conforms in all material respects, 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 or are first used to confirm sales of the Shares, as
     the case may be, conform in all material respects to the requirements of
     the Securities Act and the Rules and Regulations, (ii) the Registration
     Statement and any amendment thereto does not, and will not, as of the
     applicable effective date, contain any untrue statement of a material fact
     or omit to state any material fact required to be stated therein or
     necessary to make the statements therein not misleading and (iii) the
     Prospectus and any amendment or supplement thereto will not, as of the
     applicable filing date or as of the first date of its use to confirm sales
     of the Shares, contain any untrue statement of a material fact or omit to
     state any material fact required to be stated therein or necessary to make
     the statements therein, in the light of the circumstances under which they
     were made, not misleading.  If the Effective Date is after the date of this
     Agreement, (i) the Registration Statement and the Prospectus and any
     further amendments or supplements thereto will, when they become effective
     or are filed with the Commission or are first used to confirm sales of the
     Shares, as the case may be, conform in all material respects to the
     requirements of the Securities Act and the Rules and Regulations, (ii) the
     Registration Statement and any amendment thereto will not, as of the
     applicable Effective Date, contain any untrue statement of a material fact
     or omit to state any material fact required to be

                                       2
<PAGE>

     stated therein or necessary to make the statements therein not misleading
     and (iii) the Prospectus and any amendment or supplement thereto will not,
     as of the applicable filing date or as of the first date of their use to
     confirm sales of the Shares, contain any untrue statement of a material
     fact or omit to state any material fact required to be stated therein or
     necessary in order to make the statements therein, in the light of the
     circumstances under which they were made, not misleading. In addition, each
     of the statements made in such documents within the coverage of Rule 175(b)
     of the Rules and Regulations was made or will be made by the Company with a
     reasonable basis and in good faith. Notwithstanding the foregoing, no
     representation or warranty is made as to information contained in or
     omitted from the Registration Statement or the Prospectus or any amendment
     or supplement thereto 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. There is no
     contract or document required to be described in the Registration Statement
     or the Prospectus or to be filed as an exhibit to the Registration
     Statement which is not described or filed as required.

(c)  The Company is a corporation duly organized and validly existing in good
     standing under the laws of the State of Texas with full corporate power and
     authority to own, lease and operate its properties and conduct its business
     and is duly qualified or registered as a foreign corporation for the
     transaction of business and is in good standing as a foreign corporation
     under the laws of each jurisdiction in which the character of the business
     conducted by it or the location of the properties owned, leased or operated
     by it make such qualification or registration necessary, except where the
     failure to qualify or register or to be in good standing would not,
     individually or in the aggregate, have a material adverse effect on the
     condition (financial or other), results of operations, business or
     prospects of the Company and its Subsidiaries (as defined below) taken as a
     whole (a "Material Adverse Effect").

(d)  Each of ATP Energy, Inc. and ATP Oil & Gas (UK) Limited (each a
     "Subsidiary" and collectively, the "Subsidiaries") is duly organized and
     validly existing as a corporation in good standing under the laws of the
     jurisdiction of its incorporation, with full power and authority to own,
     lease and operate its properties and conduct its business and is duly
     qualified or registered for the transaction of business and is in good
     standing under the laws of each jurisdiction in which the character of the
     business conducted by it or the location of the properties owned, leased or
     operated by it make such qualification or registration necessary, except
     where the failure to qualify or register or to be in good standing would
     not, individually or in the aggregate, have a Material Adverse Effect.  All
     the outstanding shares of capital stock or other equity interests of each
     of the Subsidiaries have been duly authorized and validly issued, are fully
     paid and nonassessable and all of such shares of capital stock or other
     equity interests are owned by the Company directly, or indirectly through
     one of the Subsidiaries, free and clear of any lien, adverse claim,
     security interest or other encumbrance.  The Company does not own, directly
     or indirectly, any capital stock, membership interest, partnership
     interest, joint venture interest or other equity or ownership interest in
     any person or entity, other than the Subsidiaries.

(e)  The authorized and outstanding capital stock of the Company is as set forth
     in the Prospectus, and all of the issued and outstanding shares of capital
     stock of the Company have been duly authorized and validly issued and are
     fully paid and nonassessable.

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<PAGE>

     The Shares have been duly and validly authorized and, when issued and
     delivered against payment therefor as provided herein, will be duly and
     validly issued, fully paid and nonassessable. The Shares, when issued and
     delivered against payment therefor as provided herein, will conform to the
     description thereof contained under the caption "Description of Capital
     Stock" in the Prospectus.

(f)  Except as described in the Prospectus, there are no preemptive rights or
     other rights to subscribe for or to purchase, nor any restriction upon the
     voting or transfer of, any shares of Common Stock pursuant to the Company's
     articles of incorporation, bylaws or other governing documents or any
     agreement or other instrument to which the Company is a party or by which
     it may be bound, and, except as described in the Prospectus, there are no
     outstanding options, warrants or rights to purchase any shares of capital
     stock of the Company or any securities convertible into or exercisable or
     exchangeable for any shares of capital stock of the Company.

(g)  The Company has all requisite power and authority to execute and deliver
     this Agreement and to issue, sell and deliver the Shares in accordance with
     and upon the terms and conditions set forth in this Agreement and in the
     Registration Statement and Prospectus.  On or before each Delivery Date (as
     defined in Section 5 hereof), all action required to be taken by the
     Company for the authorization, issuance, sale and delivery of the Shares
     and the consummation of the transactions contemplated by this Agreement
     shall have been validly taken.  This Agreement has been duly and validly
     authorized, executed and delivered by the Company.

(h)  Neither the offering, issuance and sale by the Company of the Shares, the
     execution, delivery and performance of this Agreement by the Company nor
     the consummation of the transactions contemplated hereby (i) conflicts or
     will conflict with or constitutes or will constitute a breach or violation
     of, or a default (or an event which, with notice or lapse of time or both,
     would constitute such a default) under, any indenture, mortgage, deed of
     trust, loan agreement or other agreement or instrument to which the Company
     or any Subsidiary is a party or by which it is bound or to which any of its
     properties or assets is subject, unless such conflict, breach, violation or
     default has been validly waived, (ii) constitutes or will constitute a
     violation of the articles of incorporation, articles of organization,
     bylaws or other governing documents of the Company or any Subsidiary, (iii)
     violates or will violate any law, statute or regulation or any order, rule
     decree, judgment or injunction of any court or governmental agency or body
     directed to the Company or any Subsidiary or any of its properties in a
     proceeding to which it or its properties is a party or (iv) will result in
     the creation or imposition of any lien, charge, claim or encumbrance upon
     any property or asset of the Company or any Subsidiary, except, in the case
     of clauses (iii) and (iv) above, for such matters as would not,
     individually or in the aggregate, have a Material Adverse Effect.

(i)  Except for the registration of the Shares under the Securities Act and such
     consents, approvals, authorizations, registrations or qualifications as may
     be required under the Securities Exchange Act of 1934, as amended (the
     "Exchange Act"), and applicable state securities or "Blue Sky" laws in
     connection with the purchase and distribution of the Shares by the
     Underwriters, no consent, approval, authorization or order of, or filing or
     registration with,

                                       4
<PAGE>

     any 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.

(j)  Except as described in the Prospectus, there are no contracts, agreements
     or understandings between the Company and any person granting such person
     the right 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, other than any
     such rights that have been waived or satisfied.

(k)  Except as described in the Registration Statement, 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 Regulation D or S of, the Securities Act.

(l)  Neither the Company nor any Subsidiary has sustained, since the date of the
     latest audited financial statements included in the Prospectus, any
     material loss or interference with its business from fire, explosion,
     flood, accident or other calamity, whether or not covered by insurance, or
     from any labor dispute, or has become a party to or the subject of any
     material litigation, court or governmental action, investigation, order or
     decree, in any case otherwise than as set forth or contemplated in the
     Prospectus; and, since the respective dates as of which information is
     given in the Prospectus, there has not been any change in the capital stock
     or long-term debt, or any material change in short-term debt, of the
     Company and the Subsidiaries on a consolidated basis or any material
     adverse change, or any development involving a prospective material adverse
     change, in or affecting the general affairs, operations, business,
     prospects, management, capitalization, financial condition, results of
     operations or net worth of the Company and the Subsidiaries, taken as a
     whole, otherwise than as set forth or contemplated in the Prospectus.

(m)  KPMG LLP, who have certified certain financial statements included in the
     Registration Statement, any Preliminary Prospectus and the Prospectus (or
     any amendment or supplement thereto), are independent public accountants
     with respect to the Company as required by the Securities Act and the Rules
     and Regulations.

(n)  The financial statements (including the related notes) included in the
     Registration Statement, any Preliminary Prospectus and the Prospectus (or
     any amendment or supplement thereto) present fairly in all material
     respects the financial position, results of operations and cash flows of
     the entities purported to be shown thereby at the dates and for the periods
     indicated, all in conformity with generally accepted accounting principles
     applied on a consistent basis throughout the periods indicated.  The
     selected historical financial data included in the Prospectus under the
     caption "Selected Historical and Unaudited Pro Forma Financial Information"
     are fairly stated in relation to the historical financial statements from
     which they have been derived.  The pro forma financial statements set forth
     in the Registration Statement,

                                       5
<PAGE>

     any Preliminary Prospectus and the Prospectus (the "pro forma financial
     statements") have been prepared in accordance with the applicable
     accounting requirements of Rule 11-02 of Regulation S-X; the pro forma
     adjustments reflected in the pro forma financial statements have been
     properly applied to the historical amounts in compilation of such
     statements; and the assumptions used in the preparation of the pro forma
     financial statements are, in the opinion of the Company, reasonable.

(o)  Each of the Company and the Subsidiaries has (i) good and indefeasible
     title to all its interests in its natural gas and oil properties, and (ii)
     good and marketable title in fee simple to all other real property and good
     and marketable title to all personal property owned by it, in each case
     free and clear of all liens, claims, encumbrances and title defects except
     (a) as described in the Prospectus or (b) such as do not materially
     interfere with the use of such properties as they have been used in the
     past and are proposed to be used in the future as described in the
     Prospectus; and all real property and buildings held under lease by the
     Company and the Subsidiaries are held by it under valid, subsisting and
     enforceable leases, with such exceptions as are not material and do not
     interfere with the use made and proposed to be made of such property and
     buildings by the Company or any Subsidiary.

(p)  Neither the Company nor any Subsidiary is (i) in breach or violation of its
     charter, articles of organization, bylaws or other governing documents,
     (ii) in violation of any law, statute or regulation or order, decree,
     judgment or injunction of any court or governmental agency or body having
     jurisdiction over it or (iii) in default (and no event has occurred which,
     with notice or lapse of time or both, would constitute such a default),
     breach or violation in the due performance of any term, covenant or
     condition contained in any 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 are subject, except, in
     the case of clauses (ii) and (iii) above, for such matters as would not,
     individually or in the aggregate, have a Material Adverse Effect.  To the
     knowledge of the Company, no third party to any indenture, mortgage, deed
     of trust, loan agreement or other material agreement or instrument to which
     the Company is a party or by which it is bound or to which any of its
     properties are subject is in default under any such agreement except for a
     default or defaults which would not, individually or in the aggregate, have
     a Material Adverse Effect.

(q)  No action has been taken and no statute, rule or regulation or order has
     been enacted, adopted or issued by any governmental agency or body which
     prevents the issuance of the Shares or suspends the effectiveness of the
     Registration Statement, prevents or suspends the use of any Preliminary
     Prospectus or suspends the sale of the Shares in any jurisdiction in which
     the Shares are qualified pursuant to Section 6(h) hereof; no injunction,
     restraining order or order of any nature by a federal or state court of
     competent jurisdiction has been issued with respect to the Company which
     would prevent or suspend the issuance or sale of the Shares, the
     effectiveness of the Registration Statement or the use of any Preliminary
     Prospectus in any jurisdiction in which the Shares are qualified pursuant
     to Section 6(h) hereof; no action, suit or proceeding is pending against
     or, to the best knowledge of the Company, threatened against or affecting
     the Company or any Subsidiary before any court or arbitrator or any
     governmental body, agency or official, domestic or foreign, which, if
     adversely determined,

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     would materially interfere with or adversely affect the issuance of the
     Shares or the other transactions contemplated hereby, or the performance by
     the Company of its obligations hereunder.

(r)  Except as disclosed in the Prospectus, there is no action, suit or
     proceeding before or by any court or governmental agency or body, domestic
     or foreign, now pending or, to the knowledge of the Company, threatened
     against the Company or any Subsidiary or any of their respective properties
     which, if determined adversely to such person, would have, individually or
     in the aggregate, a Material Adverse Effect.

(s)  Except as described in the Prospectus and except as would not have a
     Material Adverse Effect, each of the Company and the Subsidiaries owns or
     possesses adequate rights to use all patents, patent applications,
     trademarks, trademark registrations, trade names, service marks, service
     mark registrations, copyrights, licenses inventions and trade secrets
     necessary for the conduct of its business, and the Company has no reason to
     believe that the conduct of the respective businesses of the Company and
     the Subsidiaries will conflict with, and have not received any notice of
     any claim of conflict with, any such rights of others.

(t)  Each of the Company and the Subsidiaries carries, or is covered by,
     insurance in such amounts and covering such risks as is adequate for the
     conduct of its business and the value of its properties and as is
     customarily obtained by businesses similarly situated.  In the Company's
     reasonable judgment, such insurance insures against such losses and risks
     as are adequate to protect the Company and the Subsidiaries and their
     respective businesses.  Neither the Company nor any Subsidiary has received
     notice from any insurer or agent of such insurer that substantial capital
     improvements or other expenditures will have to be made in order to
     continue such insurance; and all such insurance is outstanding and duly in
     force on the date hereof and will be outstanding and duly in force on each
     Delivery Date.

(u)  Neither the Company nor any Subsidiary is, or at either Delivery Date will
     be, (a) a "public utility company," a "holding company" or a "subsidiary
     company" of a "holding company" or an "affiliate" thereof, within the
     meaning of the Public Utility Holding Company Act of 1935, as amended, or
     (b) an "investment company" or a company "controlled by" an "investment
     company" within the meaning of the Investment Company Act of 1940, as
     amended (the "Investment Company Act"), and the rules and regulations
     thereunder.

(v)  Except as disclosed in the Prospectus, each of the Company and Subsidiaries
     has, or at each Delivery Date will have, such permits, consents, licenses,
     franchises and authorizations of governmental or regulatory authorities
     ("permits") as are necessary to conduct the business currently (or, as
     described or contemplated in the Prospectus, to be) operated by it, except
     for such permits which, if not obtained, would not have, individually or in
     the aggregate, a Material Adverse Effect; and neither the Company nor any
     Subsidiary has received any notice of proceedings relating to the
     revocation or modification of any such permit.

(w)  There has been no storage, disposal, generation, transportation, handling
     or treatment of hazardous wastes or hazardous substances by the Company or
     any Subsidiary at,

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     upon or from any of the property now or previously owned or leased by the
     Company or any Subsidiary 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, individually 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 hazardous wastes or hazardous substances due to or
     caused by the Company or any Subsidiary, except for any such spill,
     discharge, leak, emission, injection, escape, dumping or release which
     would not have, individually or in the aggregate, a Material Adverse
     Effect; and the terms "hazardous wastes" and "hazardous substances" shall
     have the meanings specified in any applicable local, state, federal and
     foreign laws or regulations with respect to environmental protection.

(x)  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) Section 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.

(y)  The Company has filed all federal, state and local foreign income and
     franchise tax returns required to be filed through the date hereof and has
     paid all taxes due thereon, and no tax deficiency has been determined
     adversely to the Company or any Subsidiary which has had (nor does the
     Company have any knowledge of any tax deficiency which, if determined
     adversely to the Company or any Subsidiary, would have) a Material Adverse
     Effect.

(z)  Neither the Company nor any Subsidiary (i) has taken, and none of such
     persons shall take, directly or indirectly, any action designed to cause or
     result in, or which has constituted or which might constitute, the
     stabilization or manipulation of the price of the Common Stock to
     facilitate the sale or resale of the Common Stock in violation of any law,
     rule or regulation or (ii) since the initial filing of the Registration
     Statement, except as contemplated by this Agreement, (A) has sold, bid for,
     purchased or paid anyone any compensation for soliciting purchases of the
     Common Stock or (B) has paid or, except as contemplated hereby, has agreed
     to pay to any person any compensation for soliciting another to purchase
     any other securities of the Company.

(aa) The Shares have been approved for inclusion on the Nasdaq National Market
     ("Nasdaq"), subject only to official notice of issuance.

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(bb) From 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 any securities or granted any
     options to purchase any securities, (ii) incurred any material liability or
     obligation, direct or contingent, other than liabilities and obligations
     which were incurred in the ordinary course of business, (iii) entered into
     any material transaction not in the ordinary course of business or (iv)
     declared or paid any dividend on its capital stock.

(cc) 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
     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 authorization and (D) the recorded accountability for its
     assets is compared with existing assets at reasonable intervals.

(dd) Neither the Company nor any Subsidiary, nor any director, officer, agent,
     employee or other person associated with or acting on behalf of the Company
     or any Subsidiary, 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.

(ee) No relationship, direct or indirect, exists between or among the Company or
     any Subsidiary, on the one hand, and any of the directors, officers,
     shareholders, customers or suppliers of the Company or any Subsidiary, on
     the other hand, which is required to be described in the Prospectus which
     is not so described.

(ff) No consent, approval, authorization or order of, or qualification with, any
     governmental body or agency, other than those obtained, is required in
     connection with the offering of up to 375,000 Firm Shares, which Lehman
     Brothers Inc. has agreed to reserve for sale to the Company's officers,
     directors, employees and their family members and persons having business
     relationships with the Company and the Subsidiaries.

(gg) None of the Directed Shares (as defined in Section 4) distributed in
     connection with the Directed Share Program (as defined in Section 4) will
     be offered or sold outside of the United States.

  2. Representations, Warranties and Agreements of the Selling Shareholders.
Each Selling Shareholder severally represents, warrants and agrees solely with
respect to itself that:

(a)  Such Selling Shareholder (together with such Selling Shareholder's spouse,
     if applicable) has, and immediately prior to the Second Delivery Date (as
     defined in Section 5 hereof), such Selling Shareholder (together with such
     Selling Shareholder's spouse, if applicable) will have, good and valid
     title to the Option Shares to be sold by such Selling

                                       9
<PAGE>

     Shareholder hereunder on such date, free and clear of all liens,
     encumbrances, equities or claims; and upon delivery of such Option Shares
     and payment therefor pursuant hereto, good and valid title to such Option
     Shares, free and clear of all liens, encumbrances, equities or claims, will
     pass to the several Underwriters.

(b)  Such Selling Shareholder has the full right, power and authority to enter
     into this Agreement and a Power of Attorney and Custody Agreement (the
     "Selling Shareholder Agreement" and, together with all other similar
     agreements executed by the other Selling Shareholders, the "Selling
     Shareholder Agreements") and to sell, transfer and deliver the Shares to be
     sold by such Selling Shareholder hereunder; the execution, delivery and
     performance of this Agreement and the Selling Shareholder Agreement by such
     Selling Shareholder and the consummation by such Selling Shareholder 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 such Selling
     Shareholder is a party or by which such Selling Shareholder is bound or to
     which any of the property or assets of such Selling Shareholder is subject,
     nor will such actions result in any violation of any law, statute, order,
     rule or regulation of any court or governmental agency or body having
     jurisdiction over such Selling Shareholder or the property or assets of
     such Selling Shareholder; and, except for the registration of the Option
     Shares under the Securities Act and such consents, approvals,
     authorizations, registrations or qualifications as may be required under
     the Exchange Act or applicable state securities or "Blue Sky" laws in
     connection with the purchase and distribution of the Shares 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 Selling Shareholder Agreement by such Selling Shareholder and the
     consummation by such Selling Shareholder of the transactions contemplated
     hereby and thereby.

(c)  The information with respect to such Selling Shareholder in the
     Registration Statement and the Prospectus, including any amendments or
     supplements thereto, 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)  Such Selling Shareholder has no actual knowledge that the representations
     and warranties of the Company contained in Section 1 hereof are not true
     and correct in all material respects, is familiar with the Registration
     Statement and the Prospectus (as amended or supplemented) and has no actual
     knowledge of any material fact, condition or information not disclosed in
     the Registration Statement, as of the date thereof, or the Prospectus (or
     any amendment or supplement thereto), as of the applicable filing date,
     which has had or would have a Material Adverse Effect and is not prompted
     to sell Option Shares by any materially adverse information concerning the
     Company or any Subsidiary which is not set forth in the Registration
     Statement and the Prospectus.

(e)  Such Selling Shareholder has not taken and will not take, directly or
     indirectly, any action which is designed to or which has constituted or
     which might reasonably

                                       10
<PAGE>

     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.

(f)  Such Selling Shareholder has duly executed and delivered, in the form
     heretofore furnished to the Representatives, the Selling Shareholder
     Agreement irrevocably appointing _________ and __________, or any of them,
     as attorneys-in-fact (the "Attorneys-in-Fact"), and [the Company's transfer
     agent], as custodian (the "Custodian"); the Custodian is authorized to
     deliver the Shares to be sold by such Selling Shareholder hereunder and to
     accept payment therefor; and each Attorney-in-Fact is authorized to execute
     and deliver this Agreement and the certificate referred to in Section 9(j),
     to sell, assign and transfer to the Underwriters the Shares to be sold by
     such Selling Shareholder hereunder, to determine the purchase price to be
     paid by the Underwriters to such Selling Shareholder, as provided in
     Section 3 hereof, to authorize the delivery of the Shares to be sold by
     such Selling Shareholder hereunder, to accept payment therefor and
     otherwise to act on behalf of such Selling Shareholder in connection with
     this Agreement.

(g)  Such Selling Shareholder has irrevocably placed in custody with the
     Custodian certificates, in suitable form for transfer by delivery or
     accompanied by duly executed instruments of transfer or assignment in blank
     with signatures guaranteed, for all of the Shares to be sold by such
     Selling Shareholder pursuant to this Agreement or, pursuant to the Custody
     Agreement, has irrevocably committed to do so prior to the First Delivery
     Date (as defined in Section 5), in each case with irrevocable conditional
     instructions to deliver such Shares to the Underwriter pursuant to this
     Agreement.

(h)  Neither such Selling Shareholder nor any of its affiliates directly, or
     indirectly through one or more 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 (ee) of the By-laws of the
     National Association of Securities Dealers, Inc. (the "NASD")), any member
     firm of the NASD.

  3. Purchase of the Shares by the Underwriters. On the basis of the
representations and warranties contained in, and subject to the terms and
conditions of, this Agreement, the Company agrees to sell 7,500,000 Firm Shares
to the several Underwriters, and each of the Underwriters, severally and not
jointly, agrees to purchase the number of Firm Shares set opposite that
Underwriter's name in Schedule 1 hereto. The respective purchase obligations of
the Underwriters with respect to the Firm Shares shall be rounded among the
Underwriters to avoid fractional shares, as the Representatives may determine.

  In addition, the Selling Shareholders grant to the Underwriters an option to
purchase up to 1,125,000 Option Shares. The maximum number of Shares to be sold
by each Selling Shareholder upon exercise of such option is set forth opposite
such Selling Shareholder's name in Schedule 2 hereto. Such option is granted
solely for the purpose of covering over-allotments in the sale of Firm Shares
and is exercisable as provided in Section 5 hereof. Option Shares shall be
purchased severally for the account of the Underwriters in proportion to the
number of Firm Shares set opposite the names of such Underwriters in Schedule 1
hereto. The

                                       11
<PAGE>

respective purchase obligations of each Underwriter with respect to the Option
Shares shall be adjusted by the Representatives so that no Underwriter shall be
obligated to purchase Option Shares other than in 100 Share amounts. The price
of both the Firm Shares and any Option Shares shall be $_____ per Share.

  Neither the Company nor the Selling Shareholders shall be obligated to
deliver any of the Shares to be delivered on the First Delivery Date or the
Second Delivery Date, as the case may be, except upon payment for all the Shares
to be purchased on such Delivery Date as provided herein.

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

  It is understood that approximately 375,000 Firm Shares (the "Directed
Shares") will initially be reserved by the Underwriters (the "Directed Share
Program") for offer and sale to the Company's officers, directors, employees and
their family members and persons having business relationships with the Company
and the Subsidiaries (the "Directed Share Participants") upon the terms and
conditions set forth in the Prospectus and in accordance with the rules and
regulations of the NASD.  Under no circumstances will Lehman Brothers Inc. or
any Underwriter be liable to the Company or to any Directed Share Participant
for any action taken or omitted to be taken in good faith in connection with
such Directed Share Program.  To the extent that any Directed Shares are not
affirmatively reconfirmed for purchase by any Directed Share Participant on or
immediately after the date of this Agreement, such Directed Shares may be
offered to the public as part of the public offering contemplated hereby.

  5. Delivery of and Payment for the Shares. Delivery of and payment for the
Firm Shares shall be made at such place as shall be determined by agreement
between the Representatives and the Company at 10:00 A.M., New York City time,
on the fourth full Business Day (as defined in Section 17 hereof) following the
date of this Agreement or at such other date as shall be determined by agreement
between the Representatives and the Company. This date and time are sometimes
referred to as the "First Delivery Date." On the First Delivery Date, the
Company shall deliver or cause to be delivered certificates representing the
Firm Shares to the Representatives for the account of each Underwriter against
payment to or upon the order of the Company of the purchase price by wire
transfer of immediately available funds. 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
Firm Shares 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 First Delivery Date. For the purpose of expediting the checking and
packaging of the certificates for the Firm Shares, the Company shall make the
certificates representing the Firm Shares available for inspection by the
Representatives in New York City, not later than 2:00 P.M., New York City time,
on the Business Day prior to the First Delivery Date.

                                       12
<PAGE>

  At any time on or before the thirtieth day after the date of this Agreement,
the option granted in Section 3 may be exercised by written notice being given
by the Representatives to the Selling Shareholders with a copy to the Company.
Such notice shall set forth the aggregate number of Option Shares as to which
the option is being exercised, the names in which the Option Shares are to be
registered, the denominations in which the Option Shares are to be issued and
the date and time, as determined by the Representatives, when the Option Shares
are to be delivered; provided, however, that this date and time shall not be
earlier than the First Delivery Date nor earlier than the second Business Day
after the date on which the option shall have been exercised nor later than the
fifth Business Day after the date on which the option shall have been exercised.
The date and time the Option Shares are delivered are sometimes referred to as
the "Second Delivery Date," and the First Delivery Date and the Second Delivery
Date are sometimes each referred to as a "Delivery Date."

  Delivery of and payment for the Option Shares shall be made at the place
specified in the first sentence of the first paragraph of this Section 5 (or at
such other place as shall be determined by agreement between the Representatives
and the Selling Shareholders) at 10:00 A.M., New York City time, on the Second
Delivery Date. On the Second Delivery Date, the Selling Shareholders shall
deliver or cause to be delivered the certificates representing the Option Shares
to the Representatives for the account of each Underwriter against payment to or
upon the order of the Selling Shareholders of the purchase price by wire
transfer of immediately available funds. 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
Option Shares shall be registered in such names and in such denominations as the
Representatives shall request in the aforesaid written notice. For the purpose
of expediting the checking and packaging of the certificates for the Option
Shares, the Custodian shall make the certificates representing the Option Shares
available for inspection by the Representatives in New York City, not later than
2:00 P.M., New York City time, on the Business Day prior to the Second Delivery
Date.

  6. Further Agreements of the Company.  The Company covenants and agrees with
each Underwriter:

(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 the 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) of the Rules and
     Regulations; to make no further amendment or any supplement to the
     Registration Statement or to the Prospectus 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 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 Shares for
     offering or sale in any jurisdiction, of the initiation or threatening of
     any proceeding

                                       13
<PAGE>

     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 of the Representatives and to counsel for the
     Underwriters an executed 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 the Representatives such number of the following
     documents as the Representatives 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) and
     (ii) each Preliminary Prospectus, the Prospectus and any amended or
     supplemented Prospectus; 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 Shares or any other securities relating thereto 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 shall be necessary to amend or supplement the Prospectus in
     order to comply with the Securities 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 the Representatives 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 reasonable judgment of the
     Representatives, be required by the Securities Act or requested by the
     Commission;

(e)  Prior to filing with the Commission any amendment to the Registration
     Statement or supplement to the Prospectus or any Prospectus pursuant to
     Rule 424 of the Rules and Regulations, to furnish a copy thereof to the
     Representatives and counsel for the Underwriters and obtain the consent of
     the Representatives to the filing, which consent shall not be unreasonably
     withheld;

(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 the 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);

                                       14
<PAGE>

(g)  For a period of five years following the Effective Date, to furnish to the
     Representatives upon request copies of all materials furnished by the
     Company to its security holders and all public reports and all reports and
     financial statements furnished by the Company to the principal national
     securities exchange or automated quotation system upon which the Shares 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 Shares 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 Shares; provided that in no event shall
     the Company be obligated in connection therewith to qualify as a foreign
     corporation, or to execute a general consent to service of process;

(i)  For a period of 180 days from the date of the Prospectus, not to, directly
     or indirectly, (1) 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 (other than shares issued upon the
     exercise of (i) currently outstanding options or (ii) options granted
     pursuant to the Company's 2000 Stock Option Plan) or securities convertible
     into or exchangeable for Common Stock, or sell or grant options, rights or
     warrants with respect to any shares of Common Stock (other than options
     granted pursuant to the Company's 2000 Stock Plan) or securities
     convertible into or exchangeable for Common Stock or (2) 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
     (1) or (2) 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)  To cause each shareholder, officer and director of the Company to furnish
     to the Representatives (other than the Selling Shareholders), prior to the
     First Delivery Date, a letter or letters, substantially in the form
     attached hereto as Exhibit A;

(k)  To take such action as shall be necessary to comply with the rules and
     regulations of the Nasdaq with respect to the Shares;

(l)  To apply the net proceeds from the sale of the Shares as set forth in the
     Prospectus;

(m)  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 and the rules and regulations
     of the Commission thereunder;

                                       15
<PAGE>

(n)  To timely complete all required filings and otherwise fully comply in a
     timely manner with all provisions of the Exchange Act, including the rules
     and regulations thereunder, in connection with the registration of the
     Shares thereunder; and

(o)  In connection with the Directed Share Program, to ensure that the Directed
     Shares will be restricted to the extent required by the NASD or the rules
     of such association from sale, transfer, assignment, pledge or
     hypothecation for a period of three months following the date of
     effectiveness of the Registration Statement, and Lehman Brothers Inc. will
     notify the Company as to which Directed Share Participants will need to be
     so restricted.  At the request of Lehman Brothers Inc., the Company will
     direct the transfer agent to place stop transfer restrictions upon such
     securities for such period of time.

  7.  Expenses.  The Company agrees to pay (a) the costs incident to the
authorization, issuance, sale and delivery of the Shares and any taxes payable
in that connection; (b) the costs incident to the preparation, printing, filing,
delivery and shipping 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), each Preliminary Prospectus, the
Prospectus and any amendment or supplement to the Prospectus, 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 Shares; (e) the filing fees incident to securing any required
review by the NASD of the terms of sale of the Shares; (f) any applicable
listing or other similar fees; (g) the fees and expenses of qualifying the
Shares under the securities laws of the several jurisdictions as provided in
Section 6(h) and of preparing, printing and distributing a Blue Sky Memorandum,
if the preparation of such Memorandum is requested by the Representatives
(including related fees and expenses of counsel to the Underwriters); (h) the
cost of printing certificates representing the Shares; (i) the costs and charges
of any transfer agent or registrar; (j) the fees and disbursements incurred by
the Underwriters in connection with the Directed Share Program, including
reasonable fees and expenses of counsel, and any stamp duties or other taxes
incurred by the Underwriters in connection with the Directed Share Program; (k)
the costs and expenses of the Company relating to investor presentations on any
"road show" undertaken in connection with the marketing of the offering of the
Shares, including, without limitation, expenses associated with the production
of road show slides and graphics, fees and expenses of any consultants engaged
in connection with the road show presentations with the prior approval of the
Company, travel and lodging expenses of the representatives and officers of the
Company and any such consultants, and the cost of any aircraft chartered in
connection with the road show and (l) all other costs and expenses incident to
the performance of the obligations of the Company; provided that, except as
provided in this Section 7 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 Shares which they may sell and the expenses of advertising
any offering of the Shares made by the Underwriters.

                                       16
<PAGE>

  8. Covenants of the Selling Shareholders.  Each Selling Shareholder severally
agrees:

(a)  Except as contemplated by this Agreement, for a period of 180 days from the
     date of the Prospectus, not to, directly or indirectly, (1) 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 or (2) 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 shares of Common Stock, whether any such transaction
     described in clause (1) or (2) 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.; provided that the foregoing
     restrictions shall not apply to any gift of Common Stock by such Selling
     Shareholder to a donee that agrees in writing for the benefit of the
     Underwriters to be bound by the same restrictions with respect to such
     shares of Common Stock;

(b)  That the Shares to be sold by such Selling Shareholder hereunder, which are
     represented by the certificates held in custody for such Selling
     Shareholder pursuant to the Selling Shareholder Agreement, is subject to
     the interest of the Underwriters, that the arrangements made by such
     Selling Shareholder for such custody are irrevocable and that the
     obligations of such Selling Shareholder hereunder and thereunder shall not
     be terminated by any act of such Selling Shareholder, by the death,
     disability, incompetence or incapacity of such Selling Shareholder, by
     operation of law or by any other event; and

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

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

(a)  The Prospectus shall have been timely filed with the Commission in
     accordance with Section 6(a) hereof, the Registration Statement and all
     post-effective amendments to the Registration Statement shall have become
     effective, all filings required by Rule 424 and Rule 430A of the Rules and
     Regulations shall have been made and no such filings shall have been made
     without the consent of the Representatives; no stop order suspending the
     effectiveness of the Registration Statement or any amendment or supplement
     thereto or suspending the qualification of the Shares for offering or sale
     in any jurisdiction shall have been issued; no proceedings for the issuance
     of any such order shall have been initiated or threatened by the
     Commission; and any request of the Commission for additional information
     (to be included in the Registration Statement or the Prospectus or
     otherwise) shall have been disclosed to the Representatives and complied
     with to their satisfaction.

                                       17
<PAGE>

(b)  No Underwriter shall have been advised by the Company or shall have
     discovered and disclosed to the Company that the Registration Statement or
     the Prospectus or any amendment or supplement thereto contains an untrue
     statement of fact which, in the opinion of the Representatives or in the
     opinion of counsel to the Underwriters, is material or omits to state a
     fact which, in the opinion of the Representatives or in the opinion of
     counsel to the Underwriters, 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 Selling Shareholder
     Agreements, the Shares, the Registration Statement and the Prospectus, and
     all other legal matters relating to this Agreement, the Selling Shareholder
     Agreements and the transactions contemplated hereby and thereby shall be
     reasonably satisfactory in all material respects to counsel for the
     Underwriters, and the Company and the Selling Shareholders shall have
     furnished to such counsel all documents and information that they may
     reasonably request to enable them to pass upon such matters.

(d)  Vinson & Elkins L.L.P. shall have furnished to the Representatives their
     written opinion, as counsel for the Company, addressed to the Underwriters
     and dated such Delivery Date, in form and substance satisfactory to the
     Representatives, with respect to the matters set forth in Exhibit B hereto.

(e)  Vinson & Elkins L.L.P. shall have furnished to the Representatives their
     written opinion, as counsel for the Selling Shareholders, addressed to the
     Underwriters and dated such Delivery Date, in form and substance
     satisfactory to the Representatives, with respect to the matters set forth
     in Exhibit C hereto.

(f)  The Representatives shall have received from Baker Botts L.L.P., counsel
     for the Underwriters, such opinion or opinions, dated such Delivery Date,
     with respect to the issuance and sale of the Shares, 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 may 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 KPMG 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 five 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.

                                       18
<PAGE>

(h)  With respect to the letter of KPMG 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 such 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 five
     days prior to the date of the bring-down letter), the conclusions and
     findings of such firm with respect to the financial information and 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 Representatives shall have received from the Company's independent
     natural gas and oil engineers, a letter or letters dated, respectively, the
     date of this Agreement and the Closing Date, in form and substance
     satisfactory to the Representatives, each stating, as of the date of such
     letter (or, with respect to matters involving changes or developments since
     the respective dates as of which information regarding the natural gas and
     oil reserves and future net cash flows is given in the Prospectus, as of
     the date not more than five days prior to the date of such letter), the
     conclusions and findings of such firm with respect to the natural gas and
     oil reserves of the Company and such other matters as the Representatives
     reasonably may request.

(j)  On each Delivery Date, there shall have been furnished to the
     Representatives a certificate, dated such Delivery Date and addressed to
     the Representatives, signed on behalf of the Company by its Chief Executive
     Officer or President and its Chief Financial Officer, to the effect that
     (i) the representations, warranties and agreements of the Company contained
     in this Agreement are true and correct, as if made at and as of such
     Delivery Date, and the Company has complied with all the agreements and
     satisfied all the conditions on its part to be complied with or satisfied
     at or prior to such Delivery Date; (ii) no stop order suspending the
     effectiveness of the Registration Statement has been issued, and no
     proceeding for that purpose has been initiated or threatened; (iii) the
     signers of said certificate have carefully examined the Registration
     Statement and the Prospectus and any amendments or supplements thereto, and
     such documents contain all statements and information required to be
     included therein, and do not include any untrue statement of a material
     fact or omit to state any material fact required to be stated therein or
     necessary to make the statements therein not misleading; (iv) since the
     Effective Date there has occurred no event required to be set forth in an
     amendment or supplement to the Registration Statement or the Prospectus
     which has not been so set forth; and (v) no event contemplated by
     subsection (l) of this Section 9 in respect of the Company or any
     Subsidiary shall have occurred.

(k)  Each Selling Shareholder (or one or more Attorneys-in-Fact on behalf of
     such Selling Shareholder) shall have furnished to the Representatives on
     the Second Delivery Date a certificate, dated the Second Delivery Date,
     signed by, or on behalf of, such Selling Shareholder stating that the
     representations, warranties and agreements of such Selling

                                       19
<PAGE>

     Shareholder contained herein are true and correct as of the Second Delivery
     Date and that such Selling Shareholder has complied with all agreements
     contained herein to be performed by such Selling Shareholder at or prior to
     the Second Delivery Date.

(l)  Since the Effective Date, neither the Company nor any Subsidiary shall have
     sustained any loss or interference with its business by fire, flood,
     explosion, accident or other calamity, whether or not covered by insurance,
     which is materially adverse to the Company and the Subsidiaries taken as a
     whole, or shall have become a party to or the subject of any litigation,
     court or governmental action, investigation, order or decree which is
     materially adverse to the Company and the Subsidiaries taken as a whole;
     nor shall there have been a change in the capital stock, a material change
     in the short-term debt or a material change in the long-term debt of any of
     the Company and the Subsidiaries taken as a whole or any material adverse
     change, or any development involving a prospective material adverse change,
     in or affecting the general affairs, operations, business, prospects,
     management, capitalization, financial condition, results of operations or
     net worth of the Company and the Subsidiaries taken as a whole, which loss,
     interference, litigation, action, investigation, order, decree, change or
     development, in the judgement of the Representatives, shall render it
     impractical or inadvisable to proceed with the payment for and delivery of
     the Shares.

(m)  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, the American Stock Exchange or Nasdaq 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, which makes it, in the
     judgment of the Representatives, impracticable or inadvisable to proceed
     with the public offering or delivery of the Shares being delivered on such
     Delivery Date on the terms and in the manner contemplated in the
     Prospectus; (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 which makes it, in the judgment of
     the Representatives, impracticable or inadvisable to proceed with the
     public offering or delivery of the Shares being delivered on such Delivery
     Date on the terms and in the manner contemplated in the Prospectus; 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 Shares being delivered on such Delivery Date on
     the terms and in the manner contemplated in the Prospectus.

(n)  The Nasdaq shall have approved the Shares for listing, subject only to
     official notice of issuance and evidence of satisfactory distribution.

                                       20
<PAGE>

(o)  The Representatives shall have been furnished by the Company and the
     Selling Shareholders such additional documents and certificates as the
     Representatives or counsel for the Underwriters may reasonably request.

  All such opinions, certificates, letters and documents shall be in compliance
with the provisions hereof only if they are satisfactory in form and substance
to the Representatives and to counsel for the Underwriters. The Company and the
Selling Shareholders shall furnish to the Representatives conformed copies of
such opinions, certificates, letters and other documents in such number as they
shall reasonably request. If any of the conditions specified in this Section 9
shall not have been fulfilled, when and as required by this Agreement, this
Agreement and all obligations of the Underwriters hereunder may be canceled at,
or at any time prior to, each Delivery Date, by the Representatives. Any such
cancellation shall be without liability of the Underwriters to the Company, the
Selling Shareholders or any of their respective affiliates. Notice of such
cancellation shall be given to the Company and the Selling Shareholders in
writing, or by telegraph or telephone and confirmed in writing.

  10. Indemnification and Contribution.

(a)  The Company 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 Shares), 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 Shares under the securities laws of
     any state or other jurisdiction (any such application, document or
     information being hereinafter called a "Blue Sky Application"), (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
     or (iii) any act or failure to act or any alleged act or failure to act by
     any Underwriter in connection with, or relating in any manner to, the
     Shares or the offering contemplated hereby, and which is included as part
     of or referred to in any loss, claim, damage, liability or action arising
     out of or based upon matters covered by clause (i) or (ii) above (provided
     that the Company shall not be liable under this clause (iii) to the extent
     that it is determined in a final judgment by a court of competent
     jurisdiction that such loss, claim, damage, liability or action resulted
     directly from any such acts or failures to act undertaken or omitted to be
     taken by such Underwriter through its gross negligence or willful
     misconduct), and shall reimburse each Underwriter and each such officer,
     employee or controlling person promptly upon demand for any legal or other
     expenses reasonably incurred by that Underwriter, officer, employee or
     controlling person in connection with investigating or defending or

                                       21
<PAGE>

     preparing to defend against any such loss, claim, damage, liability or
     action as such expenses are incurred; provided, however, that the Company
     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
     furnished to the Company through the Representatives by or on behalf of any
     Underwriter specifically for inclusion therein; provided further that with
     respect to any untrue statement or omission or alleged untrue statement or
     omission made in any Preliminary Prospectus, which untrue statement or
     omission or alleged untrue statement or omission in such Preliminary
     Prospectus was corrected in the Prospectus, the indemnity agreement
     contained in this paragraph 9(a) shall not inure to the benefit of any
     Underwriter, officer, employee or controlling person to the extent that any
     such loss, claim, damage, liability or action results from the fact that a
     copy of the Prospectus was not sent or given to the person asserting any
     such losses, claims, damages, liabilities or actions at or prior to the
     written confirmation of the sale of the applicable Shares to such person by
     such Underwriter (provided that the Company shall have complied with the
     provisions of Section 6(a) and (c) hereof and such Underwriter shall have
     been provided with the number of copies of such Prospectus requested by
     such Underwriter in a timely manner) and it is judicially determined that
     such delivery was required under the Securities Act and was not so made.
     The foregoing indemnity agreement is in addition to any liability which the
     Company may otherwise have to any Underwriter or to any officer, employee
     or controlling person of that Underwriter.

  The Company agrees to indemnify and hold harmless Lehman Brothers Inc., its
officers and employees and each person, if any, who controls Lehman Brothers
Inc. within the meaning of the Securities Act (collectively, the "Lehman
Brothers Entities"), from and against any loss, claim, damage or liability or
any action in respect thereof to which any of the Lehman Brothers Entities 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
material prepared by or with the approval of the Company for distribution to
Directed Share Participants in connection with the Directed Share Program or any
omission or alleged omission to state therein a material fact required to be
stated therein or necessary to make the statements therein not misleading, (ii)
the failure of any Directed Share Participant to pay for and accept delivery of
the Directed Shares sold pursuant to the Directed Share Program which,
immediately following the effectiveness of the Registration Statement, were
subject to a properly confirmed agreement to purchase or (iii) the Directed
Share Program, provided that the Company shall not be responsible under this
subparagraph (iii) for any loss, claim, damage, liability or action that is
finally judicially determined to have resulted directly from the gross
negligence or willful misconduct of the Lehman Brothers Entities. The Company
shall reimburse the Lehman Brothers Entities promptly upon demand for any legal
or other expenses reasonably incurred by them in connection with investigating
or defending or preparing to defend against any such loss, claim, damage,
liability or action as such expenses are incurred.

                                       22
<PAGE>

(b)  The Selling Shareholders, severally in proportion to the number of Shares
     to be sold by each of them hereunder, 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 Option
     Shares), to which such 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 breach of a representation, warranty, covenant or agreement made by the
     Selling Shareholders in this Agreement, (ii) 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 (iii) the omission or alleged omission
     to state in any Preliminary Prospectus, the Registration Statement or the
     Prospectus, or any such amendment or supplement, a material fact required
     to be stated therein or necessary to make the statements therein not
     misleading; and shall reimburse each Underwriter and each such officer,
     employee or controlling person promptly upon demand for any legal or other
     expenses reasonably incurred by that Underwriter, 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; provided, however, that no Selling
     Shareholder shall be liable under this paragraph 10(b) or otherwise for any
     amount in excess of the net proceeds received by it (computed without
     deduction for any taxes on such amount) in connection with the sale of the
     Shares; provided further, that with respect to any such loss, claim,
     damage, liability or action that arises out of or is based upon an untrue
     statement or alleged untrue statement or omission or alleged omission in
     any preliminary Prospectus, the Registration Statement or the Prospectus,
     or in any amendment or supplement thereto, a Selling Shareholder shall be
     liable to the extent, but only to the extent, that such statement or
     omission is made in reliance upon and in conformity with written
     information about such Selling Stockholder furnished to the Company by such
     Selling Shareholder expressly for use in the preparation of any Preliminary
     Prospectus, the Registration Statement or the Prospectus, or in any
     amendment or supplement thereto; provided, further that with respect to any
     untrue statement or omission or alleged untrue statement or omission made
     in any Preliminary Prospectus, which untrue statement or omission or
     alleged untrue statement or omission in such Preliminary Prospectus was
     corrected in the Prospectus, the indemnity agreement contained in this
     paragraph 10(b) shall not inure to the benefit of any Underwriter, officer,
     employee or controlling person to the extent that any such loss, claim,
     damage, liability or action results from the fact that a copy of the
     Prospectus was not sent or given to the person asserting any such losses,
     claims, damages, liabilities or actions at or prior to the written
     confirmation of the sale of the applicable Shares to such person by such
     Underwriter (provided that the Company shall have complied with the
     provisions of Section 6(a) and (c) hereof and such Underwriter shall have
     been provided with the number of copies of such Prospectus requested by
     such Underwriter in a timely manner) and it is judicially determined that
     such delivery was required under the Securities Act and was not so made.

(c)  Each Underwriter, severally but not jointly, shall indemnify and hold
     harmless the Company, and its officers, employees and directors (including
     any person who,

                                       23
<PAGE>

     with his or her consent, is named in the Registration Statement as about to
     become a director of the Company), and each other person, if any, who
     controls the Company within the meaning of the Securities Act, and each
     Selling Shareholder 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 or controlling person or Selling Shareholder 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 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 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 or controlling person
     and Selling Shareholder for any legal or other expenses reasonably incurred
     by the Company or any such director, officer or controlling person or
     Selling Shareholder 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
     or Selling Shareholder.

(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 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 Representatives shall have the right to employ counsel to
     represent jointly the Representatives and those other Underwriters and
     their respective officers, employees and controlling persons who may be
     subject to liability arising out of any claim in respect of which indemnity
     may be sought by the Underwriters against the Company or the Selling
     Shareholders under this Section 10 if, in the reasonable judgment of the
     Representatives, it is advisable for the Representatives and those
     Underwriters, officers,

                                       24
<PAGE>

     employees and controlling persons to be jointly represented by separate
     counsel, and in that event the fees and expenses of such separate counsel
     shall be paid by the Company. Notwithstanding anything contained herein to
     the contrary, if indemnity may be sought pursuant to Section 10(a) hereof
     in respect of such claim or action, then in addition to such separate firm
     for the indemnified parties, the indemnifying party shall be liable for the
     fees and expenses of not more than one separate firm (in addition to any
     local counsel) for the Lehman Brothers Entities for the defense of any
     loss, claim, damage, liability or action arising out of the Directed Share
     Program. 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 or the Selling Shareholders, on
     the one hand, and the Underwriters, on the other hand, from the offering of
     the Shares 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 or the Selling Shareholders, on the
     one hand, and the Underwriters, on the other hand, 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.  The relative benefits received by the Company or
     the Selling Shareholders, on the one hand, and the Underwriters, on the
     other hand, with respect to such offering shall be deemed to be in the same
     proportion as the total net proceeds from the offering of the Shares
     purchased under this Agreement (before deducting expenses) received by the
     Company or the Selling Shareholders, on the one hand, and the total
     underwriting discounts and commissions received by the Underwriters with
     respect to the Shares purchased under this Agreement, on the other hand,
     bear to the total gross proceeds from the offering of the Shares 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 Selling Shareholders or the Underwriters, the intent of
     the parties and their relative knowledge, access to information and
     opportunity to correct or

                                       25
<PAGE>

     prevent such statement or omission. The Company, the Selling Shareholders
     and the Underwriters agree that it would not be just and equitable if
     contributions pursuant to this Section 10 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
     10 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), (i) no Underwriter
     shall be required to contribute any amount in excess of the amount by which
     the total price at which the Shares 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 becomes liable to pay by
     reason of any untrue or alleged untrue statement or omission or alleged
     omission and (ii) no Selling Shareholder shall be required to contribute
     any amount in excess of the amount by which the total net proceeds received
     by it (computed without deduction for any taxes on such amount) from the
     sale of the Option Shares owned by such Selling Shareholder exceeds the
     amount of any damages which such Selling Shareholder has otherwise paid or
     becomes 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 each of the Company and the Selling
     Shareholders acknowledges that the statements with respect to (i) the
     delivery of the Shares by the Underwriters set forth on the cover page of
     the Prospectus and (ii) under the caption "Underwriting" in the Prospectus,
     the number of Shares purchased by each of the Underwriters and the
     statements set forth in the 4th, 12th, 13th and 17th paragraphs are correct
     and constitute the only information furnished in writing to the Company by
     or on behalf of the Underwriters specifically for inclusion in any
     Preliminary Prospectus, the Registration Statement and the Prospectus and
     in any Blue Sky Application.

  11.  Defaulting Underwriters.

  If, on either 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 Shares which the
defaulting Underwriter agreed but failed to purchase on such Delivery Date in
the respective proportions which the number of Firm Shares set opposite the name
of each remaining non-defaulting Underwriter in Schedule 1 hereto bears to the
total number of Firm Shares 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 Shares on such Delivery Date if the total number of Shares which the
defaulting Underwriter or defaulting Underwriters agreed but failed to purchase
on such date exceeds 9.09% of the total number of Shares to be purchased on such
Delivery

                                       26
<PAGE>

Date, and any remaining non-defaulting Underwriter shall not be obligated to
purchase more than 110% of the number of the Shares which it agreed to purchase
on such 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 Shares to be purchased on such 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 such Delivery Date,
this Agreement (or, with respect to the Second Delivery Date, the obligation of
the Underwriters to purchase, and of the Selling Shareholders to sell, the
Option Shares) shall terminate without liability on the part of any non-
defaulting Underwriter, the Company or the Selling Shareholders, except that the
Company will continue to be liable for the payment of expenses to the extent set
forth in Section 7. 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 Firm Shares 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 for damages, including expenses paid by the
Company pursuant to Section 7, caused by its default.  If other Underwriters are
obligated or agree to purchase the Shares 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
prior to delivery of and payment for the Firm Shares if, prior to that time, any
of the events described in Section 9(k) or 9(l) shall have occurred or if the
Underwriters shall decline to purchase the Shares for any reason permitted under
this Agreement.

  13. Reimbursement of Underwriters' Expenses. If the Company or any Selling
Shareholder shall fail to tender the Shares for delivery to the Underwriters by
reason of any failure, refusal or inability on the part of the Company or such
Selling Shareholder to perform any agreement to be performed by it, or because
any other condition of the Underwriters' obligations hereunder required to be
fulfilled by the Company or the Selling Shareholders is not fulfilled, the
Company will reimburse the Underwriters for all reasonable out-of-pocket
expenses (including reasonable fees and disbursements of counsel) incurred by
the Underwriters in connection with this Agreement and the proposed purchase of
the Shares, and upon demand the Company shall collectively pay the full amount
thereof to the Representatives.

  14. Notices. Any notice, consent, request, instruction, approval and other
communication provided for herein shall be in writing, shall be delivered or
sent by mail, telex or facsimile transmission and shall be deemed validly given,
made or served (i) on the date on which it is delivered personally with receipt
acknowledged, (ii) five Business Days after it is sent

                                       27
<PAGE>

by registered or certified mail (receipt requested and postage prepaid), (iii)
one Business Day after it is sent by overnight courier (charges prepaid) or (iv)
on the same Business Day when sent before 5:00 P.M., recipient's time (and on
the next Business Day when sent after 5:00 P.M., recipient's time) by telex or
telecopier, transmission confirmed and charges prepaid. Such notices shall be in
writing, and:

(a)  if to the Company, such notice shall be addressed to the Company at 4600
     Post Oak Place, Suite 200, Houston, Texas  77027, Attention: Mr. Albert L.
     Reese, Jr. (Fax: 713/622-5101);

(b)  if to the Underwriters, such notice shall be addressed to the
     Representatives in care of Lehman Brothers Inc., 3 World Financial Center,
     11th Floor, New York, New York 10285-1100, Attention: Syndicate Department
     (Fax: 212/526-6588), with a copy, in the case of any notice pursuant to
     Section 10(c), to the Director of Litigation, Office of the General
     Counsel, Lehman Brothers Inc., 3 World Financial Center, 10th Floor, New
     York, New York 10285; and

(c)  if to any Selling Shareholder, such notice shall be addressed to such
     Selling Shareholder in care of the Company at 4600 Post Oak Place, Suite
     200, Houston, Texas  77027, Attention: Mr. Albert L. Reese, Jr. (Fax:
     713/622-5101);

provided, however, that any notice to a Underwriter pursuant to Section 10(c)
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 Shareholders 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. on behalf of the Representatives.

  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
Shareholders and their respective successors. This Agreement and the terms and
provisions hereof are for the sole benefit of those persons, except that (a) the
representations, warranties, indemnities and agreements of the Company and the
Selling Shareholders contained in this Agreement shall also be deemed to be for
the benefit of the officers and employees of each Underwriter, the person or
persons, if any, who control each Underwriter within the meaning of Section 15
of the Securities Act and the Lehman Brothers Entities and (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, officers and employees of the
Company and any person controlling the Company within the 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.

                                       28
<PAGE>

  16. Survival. The respective indemnities, representations, warranties and
agreements of the Company, the Selling Shareholders 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
Shares 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 Term "Business Day." For purposes of this Agreement,
"business day" means any day on which the New York Stock Exchange, Inc. is open
for trading.

  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.

                                       29
<PAGE>

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

                                    Very truly yours,

                                    ATP OIL & GAS CORPORATION


                                    By:
                                       -----------------------------------
                                        T. Paul Bulmahn
                                        Chairman and President


                                    SELLING SHAREHOLDERS


                                    By:
                                       ------------------------------------
                                       As Attorney-in-Fact acting on behalf
                                       of the Selling Shareholders Named in
                                       Schedule 2 hereto
Accepted:

Lehman Brothers Inc.
CIBC World Markets Corp.
Dain Rauscher Incorporated
Raymond James & Associates, Inc.
Fidelity Capital Markets,
  a division of National
  Financial Services LLC

For themselves and as Representatives
of the several Underwriters named
in Schedule 1 hereto

By:  Lehman Brothers Inc.


By:
   -----------------------------------
  Authorized Representative

                                       30
<PAGE>

                                                                      SCHEDULE 1

                              LIST OF UNDERWRITERS

                                                       NUMBER OF
UNDERWRITERS                                            SHARES
------------                                         ------------

Lehman Brothers Inc. .............................
CIBC World Markets Corp. .........................
Dain Rauscher Incorporated........................
Raymond James & Associates, Inc. .................
Fidelity Capital Markets, a division of
  National Financial Services LLC.................
                                                      ----------
          Total...................................     7,500,000
                                                      ==========



                                     S-1-1
<PAGE>

                                                                      SCHEDULE 2

                              SELLING SHAREHOLDERS

                                      NUMBER OF
NAME OF SELLING SHAREHOLDER         OPTION SHARES
------------------------------      -------------
T. Paul Bulmahn...............          709,852
Gerald W. Schlief.............          275,153
Carol E. Overbey..............           91,721
Albert L. Reese, Jr...........           48,274
                                      ---------
          Total...............        1,125,000
                                      =========



                                     S-2-1
<PAGE>

                                                                       EXHIBIT A

                            LOCK-UP LETTER AGREEMENT





Lehman Brothers Inc.                                      ________________, 2001
CIBC World Markets Corp.
Dain Rauscher Incorporated
Raymond James & Associates
Fidelity Capital Markets,
  a division of National
  Financial Services LLC
c/o Lehman Brothers Inc.
Three World Financial Center
New York, New York 10285

Dear Sirs:

This letter is being delivered to you in connection with the proposed
Underwriting Agreement (the "Underwriting Agreement") among ATP Oil & Gas
Corporation, a Texas corporation (the "Company"), the selling shareholders of
the Company named therein and Lehman Brothers Inc., CIBC World Markets Corp.,
Dain Rauscher Incorporated, Raymond James & Associates, Inc., and Fidelity
Capital Markets, a division of National Financial Services LLC, as
representatives of the several underwriters named therein, relating to an
underwritten public offering of common stock, par value $.001 per share (the
"Common Stock"), of the Company.

To induce you to enter into the Underwriting Agreement, the undersigned agrees
that he/she will not, directly or indirectly, (1) 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 or (2) 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 shares of Common Stock, whether
any such transaction described in clause (1) or (2) above is to be settled by
delivery of Common Stock or other securities, in cash or otherwise, in each case
for a period of 180 days from the date of the Prospectus (as defined in the
Underwriting Agreement), without the prior written consent of Lehman Brothers
Inc.; provided that the foregoing restrictions shall not apply to any gift of
Common Stock by the undersigned to a donee that agrees in writing for the
benefit of the Underwriters to be bound by the same restrictions with respect to
such shares of Common Stock.

                                      A-1
<PAGE>

If for any reason the Underwriting Agreement is terminated before the First
Delivery Date (as defined in the Underwriting Agreement), the agreement set
forth above shall likewise be terminated.

Yours very truly,



------------------------------
Name:

                                      A-2


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