Document:

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                                                                     EXHIBIT 4.4

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                          REGISTRATION RIGHTS AGREEMENT

                                      among

                            BILL BARRETT CORPORATION

                          BILL BARRETT PROPERTIES INC.
                         BILL BARRETT PRODUCTION COMPANY

                                       and

                       GOLDMAN SACHS CREDIT PARTNERS L.P.

                          Dated as of September 1, 2004

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         THIS REGISTRATION RIGHTS AGREEMENT (this "AGREEMENT") is made and
entered into as of September 1, 2004, among Bill Barrett Corporation, a Delaware
corporation (the "COMPANY"), Bill Barrett Properties Inc., a Delaware
corporation, and Bill Barrett Production Company, a Delaware corporation (each,
a "GUARANTOR"), and Goldman Sachs Credit Partners L.P. as Sole Lead Arranger
(the "ARRANGER").

                                    RECITALS

         This Agreement is made pursuant to the Credit and Guaranty Agreement,
dated as of the date hereof (the "CREDIT AGREEMENT"), among the Company, the
Guarantors, the Lenders referred to therein (the "LENDERS"), Goldman Sachs
Credit Partners L.P., as administrative agent (the "ADMINISTRATIVE AGENT") and
the Arranger. In order to induce the Arranger, the Administrative Agent and the
Lenders to enter into the Credit Agreement and related arrangements, the Company
has agreed to provide the registration rights set forth in this Agreement. The
execution and delivery of this Agreement is a condition to the funding of any
Loans (as defined below) under the Credit Agreement.

                                   AGREEMENT

         The parties agree as follows:

1. CERTAIN DEFINITIONS. For purposes of this Agreement, the following terms
shall have the following respective meanings:

         "BASE INTEREST" means the interest that would otherwise accrue on the
   Registrable Securities or the Loans, as the case may be, under the terms
   thereof and the Exchange Note Indenture or the Credit Agreement, as
   applicable, without giving effect to the provisions of this Agreement.

         "BRIDGE LOAN MATURITY DATE" has the meaning assigned thereto in the
   Credit Agreement.

         "COMMISSION" means the United States Securities and Exchange
   Commission, or any other federal agency at the time administering the
   Exchange Act or the Securities Act, whichever is the relevant statute for the
   particular purpose.

         "EFFECTIVE TIME" means the time and date as of which the Commission
   declares the Shelf Registration Statement effective or as of which the Shelf
   Registration Statement otherwise becomes effective.

         "EFFECTIVENESS PERIOD" has the meaning assigned thereto in Section 2(a)
   hereof.

         "EFFECTIVENESS FAILURE" has the meaning assigned thereto in Section
   2(b) hereof.

         "ELECTING HOLDER" means any holder of Registrable Securities that has
   returned a completed and signed Notice and Questionnaire to the Company in
   accordance with Section 3(c)(ii) or (iii) hereof.

         "EXCHANGE ACT" means the Securities Exchange Act of 1934, or any
   successor thereto, as the same shall be amended from time to time.

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         "EXCHANGE NOTE INDENTURE" means the Exchange Note Indenture, dated as
   of September 1, 2004, among the Company, the Guarantors and Wells Fargo Bank,
   National Association, as Trustee, as the same shall be amended from time to
   time.

         "GUARANTOR" has the meaning assigned thereto in the Credit Agreement
   and the Exchange Note Indenture.

         The term "HOLDER" means each of the Lenders and other persons who
   acquire Registrable Securities from time to time (including any successors or
   assigns), in each case for so long as such person owns any Registrable
   Securities.

         "LOANS" has the meaning assigned thereto in the Credit Agreement.

         "NOTICE AND QUESTIONNAIRE" means a Notice of Registration Statement and
   Selling Securityholder Questionnaire substantially in the form of Exhibit A
   hereto.

         The term "PERSON" means a corporation, association, partnership,
   organization, business, individual, government or political subdivision
   thereof or governmental agency.

         "REGISTRABLE SECURITIES" means the Securities; provided, however, that
   a Security shall cease to be a Registrable Security when (i) a Shelf
   Registration Statement registering such Security under the Securities Act has
   been declared or becomes effective and such Security has been sold or
   otherwise transferred by the holder thereof pursuant to and in a manner
   contemplated by such effective Shelf Registration Statement; (ii) such
   Security is sold pursuant to Rule 144 under circumstances in which any legend
   borne by such Security relating to restrictions on transferability thereof,
   under the Securities Act or otherwise, is removed by the Company or pursuant
   to the Exchange Note Indenture; (iii) such Security is eligible to be sold
   pursuant to paragraph (k) of Rule 144; or (iv) such Security shall cease to
   be outstanding.

         "REGISTRATION DEFAULT" has the meaning assigned thereto in Section 2(b)
   hereof.

         "REGISTRATION EXPENSES" has the meaning assigned thereto in Section 4
   hereof.

         "RULE 144" and "RULE 415", in each case, means such rule promulgated
   under the Securities Act (or any successor provision), as the same shall be
   amended from time to time.

         "SECURITIES" means, collectively, the Senior Subordinated Exchange
   Notes due 2014 of the Company issued on the date hereof under the Exchange
   Note Indenture for delivery to the Lenders under the Credit Agreement upon
   exchange of Loans in an equal principal amount therefor. Each Security is
   entitled to the benefit of the guarantee provided for in the Exchange Note
   Indenture (the "GUARANTEE") and, unless the context otherwise requires, any
   reference herein to a "Security" or a "Registrable Security" shall include a
   reference to the related Guarantee.

         "SECURITIES ACT" means the Securities Act of 1933, or any successor
   thereto, as the same shall be amended from time to time.

         "SHELF REGISTRATION" has the meaning assigned thereto in Section 2(a)
   hereof.

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         "SHELF REGISTRATION STATEMENT" has the meaning assigned thereto in
   Section 2(a) hereof.

         "SPECIAL INTEREST" has the meaning assigned thereto in Section 2(b)
   hereof.

         "TRUST INDENTURE ACT" means the Trust Indenture Act of 1939, or any
   successor thereto, and the rules, regulations and forms promulgated
   thereunder, all as the same shall be amended from time to time.

         Unless the context otherwise requires, any reference herein to a
"Section" or "clause" refers to a Section or clause, as the case may be, of this
Agreement, and the words "herein," "hereof" and "hereunder" and other words of
similar import refer to this Agreement as a whole and not to any particular
Section or other subdivision.

2. REGISTRATION UNDER THE SECURITIES ACT.

         (a) The Company shall file under the Securities Act no later than 30
   days after the Bridge Loan Maturity Date a "shelf" registration statement
   providing for the registration of, and the sale on a continuous or delayed
   basis by the holders of, all of the Registrable Securities, pursuant to Rule
   415 or any similar rule that may be adopted by the Commission (such filing,
   the "SHELF REGISTRATION" and such registration statement, the "SHELF
   REGISTRATION STATEMENT"). The Company agrees to use all commercially
   reasonable efforts (x) to cause the Shelf Registration Statement to become or
   be declared effective no later than 120 days after such Shelf Registration
   Statement is filed and to keep such Shelf Registration Statement continuously
   effective for a period ending on the earlier of the second anniversary of the
   Effective Time or such time as there are no longer any Registrable Securities
   outstanding (such period being referred to herein as the "EFFECTIVENESS
   PERIOD"), provided, however, that no holder shall be entitled to be named as
   a selling securityholder in the Shelf Registration Statement or to use the
   prospectus forming a part thereof for resales of Registrable Securities
   unless such holder is an Electing Holder, and (y) after the Effective Time of
   the Shelf Registration Statement, promptly upon the request of any holder of
   Registrable Securities that is not then an Electing Holder, to take any
   action reasonably necessary to enable such holder to use the prospectus
   forming a part thereof for resales of Registrable Securities, including,
   without limitation, any action necessary to identify such holder as a selling
   securityholder in the Shelf Registration Statement, provided, however, that
   nothing in this clause (y) shall relieve any such holder of the obligation to
   return a completed and signed Notice and Questionnaire to the Company in
   accordance with Section 3(c)(iii) hereof. The Company further agrees to
   supplement or make amendments to the Shelf Registration Statement, as and
   when required by the rules, regulations or instructions applicable to the
   registration form used by the Company for such Shelf Registration Statement
   or by the Securities Act or rules and regulations thereunder for shelf
   registration, and the Company agrees to furnish to each Electing Holder
   copies of any such supplement or amendment prior to its being used or
   promptly following its filing with the Commission.

         (b) In the event that (i) the Company has not filed the Shelf
   Registration Statement on or before the date on which such registration
   statement is required to be filed pursuant to Section 2(a), or (ii) such
   Shelf Registration Statement has not become effective or been declared
   effective by the Commission on or before the date on which such registration
   statement is required to become or be declared effective pursuant to Section
   2(a), or (iii) any Shelf Registration Statement required by Section 2(a)
   hereof is filed and declared effective

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   but shall thereafter either be withdrawn by the Company or shall become
   subject to an effective stop order issued pursuant to Section 8(d) of the
   Securities Act suspending the effectiveness of such registration statement
   (except as specifically permitted herein) without being succeeded immediately
   by an additional registration statement filed and declared effective (each
   such event referred to in clauses (i) through (iii), a "REGISTRATION DEFAULT"
   and each period during which a Registration Default has occurred and is
   continuing, a "REGISTRATION DEFAULT PERIOD"), then, as liquidated damages for
   such Registration Default, subject to the provisions of Section 9(b), special
   interest ("SPECIAL INTEREST"), in addition to the Base Interest, shall accrue
   on the Securities and Loans, as the case may be, then outstanding at a per
   annum rate of 0.50% for the first 90 days of the Registration Default Period,
   at a per annum rate of 1.00% for the second 90 days of the Registration
   Default Period, at a per annum rate of 1.50% for the third 90 days of the
   Registration Default Period and at a per annum rate of 2.00% thereafter for
   the remaining portion of the Registration Default Period. In addition, in the
   event that during the Effectiveness Period (i) the Shelf Registration
   Statement ceases to be effective, (ii) the Company suspends the use of the
   Prospectus pursuant to Section 3(c)(viii)(F) and Section 3(d) hereof or (iii)
   the Holders are otherwise prevented or restricted by the Company from
   effecting sales pursuant to the Shelf Registration Statement (an
   "EFFECTIVENESS FAILURE") for more than 30 days, whether or not consecutive,
   in any 90-day period, or for more than 90 days, whether or not consecutive,
   during any 12-month period, then Special Interest in addition to the Base
   Interest shall accrue on the Registrable Securities then outstanding, at a
   per annum rate of 0.50% from the 31st day of the applicable 90-day period or
   the 91st day of the applicable 12-month period, as the case may be, that any
   such Effectiveness Failure has existed until the earlier of (1) the time that
   Electing Holders are again able resell Registrable Securities sales under the
   Shelf Registration Statement or (2) the expiration of the Effectiveness
   Period. Subject to section 2(c), accrued Special Interest shall be payable in
   cash on each day on which interest is otherwise payable with respect to the
   Loans or Securities, as the case may be.

         (c) To the extent that any Special Interest, together with the Base
   Interest, would cause the per annum rate of interest on any Security or Loan
   to exceed 18.0%, then the Company shall have the option to (i) capitalize
   that portion of the interest payment representing interest (including Special
   Interest) in excess of 18.0% and adding it to the aggregate principal amount
   of outstanding Loans in accordance with Section 2.7(b) of the Credit
   Agreement or (ii) issue additional Securities to the holder of such
   Securities in an amount equal to the portion of the interest payment
   representing interest (including Special Interest) in excess of 18.0% in
   accordance with Section 4.01 of the Exchange Note Indenture, as the case may
   be. Notwithstanding anything to the contrary in this Section 2, in no event
   will the Special Interest, together with the Base Interest, exceed 20.0%.

         (d) The Company shall take, and shall cause the Guarantors to take, all
   actions necessary or advisable to be taken by it to ensure that the
   transactions contemplated herein are effected as so contemplated, including
   all actions necessary or desirable to register the Guarantees under the
   registration statement contemplated in Section 2(a) hereof.

         (e) Any reference herein to a registration statement as of any time
   shall be deemed to include any document incorporated, or deemed to be
   incorporated, therein by reference as of such time and any reference herein
   to any post-effective amendment to a registration

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   statement as of any time shall be deemed to include any document
   incorporated, or deemed to be incorporated, therein by reference as of such
   time.

      3. REGISTRATION PROCEDURES.

         If the Company files a registration statement pursuant to Section 2(a),
the following provisions shall apply:

      (a) At or before the Effective Time of the Shelf Registration, as the case
   may be, the Company shall qualify the Exchange Note Indenture under the Trust
   Indenture Act of 1939.

      (b) In the event that such qualification would require the appointment of
   a new trustee under the Exchange Note Indenture, the Company shall appoint a
   new trustee thereunder pursuant to the applicable provisions of the Exchange
   Note Indenture.

      (c) In connection with the Company's obligations with respect to the Shelf
   Registration, the Company shall, as soon as practicable (or as otherwise
   specified):

            (i) prepare and file with the Commission, as soon as practicable but
         in any case within the time periods specified in Section 2(a), a Shelf
         Registration Statement on any form which may be utilized by the Company
         and which shall register all of the Registrable Securities for resale
         by the holders thereof in accordance with such method or methods of
         disposition as may be specified by such of the holders as, from time to
         time, may be Electing Holders and use all commercially reasonable
         efforts to cause such Shelf Registration Statement to become effective
         as soon as practicable but in any case within the time periods
         specified in Section 2(a);

            (ii) not less than 30 calendar days prior to the Effective Time of
         the Shelf Registration Statement, mail the Notice and Questionnaire to
         the holders of Registrable Securities; no holder shall be entitled to
         be named as a selling securityholder in the Shelf Registration
         Statement as of the Effective Time, and no holder shall be entitled to
         use the prospectus forming a part thereof for resales of Registrable
         Securities at any time, unless such holder has returned a completed and
         signed Notice and Questionnaire to the Company by the deadline for
         response set forth therein; provided, however, holders of Registrable
         Securities shall have at least 28 calendar days from the date on which
         the Notice and Questionnaire is first mailed to such holders to return
         a completed and signed Notice and Questionnaire to the Company;

            (iii) after the Effective Time of the Shelf Registration Statement,
         upon the request of any holder of Registrable Securities that is not
         then an Electing Holder, promptly send a Notice and Questionnaire to
         such holder; provided that the Company shall not be required to take
         any action to name such holder as a selling securityholder in the Shelf
         Registration Statement or to enable such holder to use the prospectus
         forming a part thereof for resales of Registrable Securities until such
         holder has returned a completed and signed Notice and Questionnaire to
         the Company;

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            (iv) as soon as practicable prepare and file with the Commission
         such amendments and supplements to such Shelf Registration Statement
         and the prospectus included therein as may be necessary to effect and
         maintain the effectiveness of such Shelf Registration Statement for the
         period specified in Section 2(a) hereof and as may be required by the
         applicable rules and regulations of the Commission and the instructions
         applicable to the form of such Shelf Registration Statement, and
         furnish to the Electing Holders copies of any such supplement or
         amendment simultaneously with or prior to its being used or filed with
         the Commission;

            (v) comply with the provisions of the Securities Act with respect to
         the disposition of all of the Registrable Securities covered by such
         Shelf Registration Statement in accordance with the intended methods of
         disposition by the Electing Holders provided for in such Shelf
         Registration Statement;

            (vi) provide (A) the Electing Holders, (B) the underwriters (which
         term, for purposes of this Agreement, shall include a person deemed to
         be an underwriter within the meaning of Section 2(a)(11) of the
         Securities Act), if any, thereof, (C) any sales or placement agent
         therefor, (D) counsel for any such underwriter or agent and (E) not
         more than one counsel for all the Electing Holders the opportunity to
         participate in the preparation of such Shelf Registration Statement,
         each prospectus included therein or filed with the Commission and each
         amendment or supplement thereto;

            (vii) for a reasonable period prior to the filing of such Shelf
         Registration Statement, and throughout the period specified in Section
         2(a), make available at reasonable times at the Company's principal
         place of business or such other reasonable place for inspection by the
         persons referred to in Section 3(c)(vi) who shall certify to the
         Company that they have a current intention to sell the Registrable
         Securities pursuant to the Shelf Registration such financial and other
         information and books and records of the Company, and cause the
         officers, employees, counsel and independent certified public
         accountants of the Company to respond to such inquiries, as shall be
         reasonably necessary, in the judgment of the respective counsel
         referred to in such Section, to conduct a reasonable investigation
         within the meaning of Section 11 of the Securities Act; provided,
         however, that each such party shall be required to maintain in
         confidence and not to disclose to any other person any information or
         records reasonably designated by the Company as being confidential,
         until such time as (A) such information becomes a matter of public
         record (whether by virtue of its inclusion in such registration
         statement or otherwise) except as a result of the disclosure by the
         receiving part in violation of this provision, or (B) such person shall
         be required so to disclose such information pursuant to a subpoena or
         order of any court or other governmental agency or body having
         jurisdiction over the matter (subject to the requirements of such
         order, and only after such person shall have given the Company prompt
         prior written notice of such requirement), or (C) such information is
         required to be set forth in such Shelf Registration Statement or the
         prospectus included therein or in an amendment to such Shelf
         Registration Statement or an amendment or supplement to such prospectus
         in order that such Shelf Registration Statement, prospectus, amendment
         or supplement, as the case may be,

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         complies with applicable requirements of the federal securities laws
         and the rules and regulations of the Commission and does not contain an
         untrue statement of a material fact or omit to state therein a material
         fact required to be stated therein or necessary to make the statements
         therein not misleading in light of the circumstances then existing;

            (viii) promptly notify each of the Electing Holders, any sales or
         placement agent therefor and any underwriter thereof (which
         notification may be made through any managing underwriter that is a
         representative of such underwriter for such purpose) and confirm such
         advice in writing, (A) when such Shelf Registration Statement or the
         prospectus included therein or any prospectus amendment or supplement
         or post-effective amendment has been filed, and, with respect to such
         Shelf Registration Statement or any post-effective amendment, when the
         same has become effective, (B) of any comments by the Commission and by
         the blue sky or securities commissioner or regulator of any state with
         respect thereto or any request by the Commission for amendments or
         supplements to such Shelf Registration Statement or prospectus or for
         additional information, (C) of the issuance by the Commission of any
         stop order suspending the effectiveness of such Shelf Registration
         Statement or the initiation or threatening of any proceedings for that
         purpose, (D) if at any time the representations and warranties of the
         Company contemplated by Section 3(c)(xvii) or Section 5 cease to be
         true and correct in all material respects, (E) of the receipt by the
         Company of any notification with respect to the suspension of the
         qualification of the Registrable Securities for sale in any
         jurisdiction or the initiation or threatening of any proceeding for
         such purpose, or (F) if at any time when a prospectus is required to be
         delivered under the Securities Act, that such Shelf Registration
         Statement, prospectus, prospectus amendment or supplement or
         post-effective amendment does not conform in all material respects to
         the applicable requirements of the Securities Act and the Trust
         Indenture Act and the rules and regulations of the Commission
         thereunder or contains an untrue statement of a material fact or omits
         to state any material fact required to be stated therein or necessary
         to make the statements therein not misleading in light of the
         circumstances then existing;

            (ix) use all commercially reasonable efforts to obtain the
         withdrawal of any order suspending the effectiveness of such
         registration statement or any post-effective amendment thereto at the
         earliest practicable date;

            (x) if requested by any managing underwriter or underwriters, any
         placement or sales agent or any Electing Holder, promptly incorporate
         in a prospectus supplement or post-effective amendment such information
         as is required by the applicable rules and regulations of the
         Commission and as such managing underwriter or underwriters, such agent
         or such Electing Holder specifies should be included therein relating
         to the terms of the sale of such Registrable Securities, including
         information with respect to the principal amount of Registrable
         Securities being sold by such Electing Holder or agent or to any
         underwriters, the name and description of such Electing Holder, agent
         or underwriter, the offering price of such Registrable Securities and
         any discount, commission or other compensation payable in respect
         thereof, the purchase price being paid therefor by such underwriters
         and with respect to any other terms of the offering of the Registrable
         Securities to be sold by such

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         Electing Holder or agent or to such underwriters; and make all required
         filings of such prospectus supplement or post-effective amendment
         promptly after notification of the matters to be incorporated in such
         prospectus supplement or post-effective amendment;

            (xi) furnish to each Electing Holder, each placement or sales agent,
         if any, therefor, each underwriter, if any, thereof and the respective
         counsel referred to in Section 3(c)(vi) an executed copy (or, in the
         case of an Electing Holder, a conformed copy) of such Shelf
         Registration Statement, each such amendment and supplement thereto (in
         each case including all exhibits thereto (in the case of an Electing
         Holder of Registrable Securities, upon request) and documents
         incorporated by reference therein) and such number of copies of such
         Shelf Registration Statement (excluding exhibits thereto and documents
         incorporated by reference therein unless specifically so requested by
         such Electing Holder, agent or underwriter, as the case may be) and of
         the prospectus included in such Shelf Registration Statement (including
         each preliminary prospectus and any summary prospectus), in conformity
         in all material respects with the applicable requirements of the
         Securities Act and the Trust Indenture Act and the rules and
         regulations of the Commission thereunder, and such other documents, as
         such Electing Holder, agent, if any, and underwriter, if any, may
         reasonably request in order to facilitate the offering and disposition
         of the Registrable Securities owned by such Electing Holder, offered or
         sold by such agent or underwritten by such underwriter and to permit
         such Electing Holder, agent and underwriter to satisfy the prospectus
         delivery requirements of the Securities Act; and, subject to Section
         3(d), the Company hereby consents to the use of such prospectus
         (including such preliminary and summary prospectus) and any amendment
         or supplement thereto by each such Electing Holder and by any such
         agent and underwriter, in each case in the form most recently provided
         to such person by the Company, in connection with the offering and sale
         of the Registrable Securities covered by the prospectus (including such
         preliminary and summary prospectus) or any supplement or amendment
         thereto;

            (xii) use all commercially reasonable efforts to (A) register or
         qualify the Registrable Securities to be included in such Shelf
         Registration Statement under such securities laws or blue sky laws of
         such jurisdictions as any Electing Holder and each placement or sales
         agent, if any, therefor and underwriter, if any, thereof shall
         reasonably request, (B) keep such registrations or qualifications in
         effect and comply with such laws so as to permit the continuance of
         offers, sales and dealings therein in such jurisdictions during the
         period the Shelf Registration is required to remain effective under
         Section 2(a) above and for so long as may be necessary to enable any
         such Electing Holder, agent or underwriter to complete its distribution
         of Securities pursuant to such Shelf Registration Statement and (C)
         take any and all other actions as may be reasonably necessary or
         advisable to enable each such Electing Holder, agent, if any, and
         underwriter, if any, to consummate the disposition in such
         jurisdictions of such Registrable Securities; provided, however, that
         neither the Company nor the Guarantor shall be required for any such
         purpose to (1) qualify as a foreign corporation in any jurisdiction
         wherein it would not otherwise be required to qualify but for the
         requirements of this Section 3(c)(xii), (2) consent to general

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         service of process in any such jurisdiction or (3) make any changes to
         its certificate of incorporation or by-laws or any agreement between it
         and its stockholders;

            (xiii) use all commercially reasonable efforts to obtain the consent
         or approval of each governmental agency or authority, whether federal,
         state or local, which may be required to effect the Shelf Registration
         or the offering or sale in connection therewith or to enable the
         selling holder or holders to offer, or to consummate the disposition
         of, their Registrable Securities in the jurisdictions specified by the
         Electing Holders pursuant to Section 3(c)(xii);

            (xiv) unless any Registrable Securities shall be in book-entry only
         form, cooperate with the Electing Holders and the managing
         underwriters, if any, to facilitate the timely preparation and delivery
         of certificates representing Registrable Securities to be sold, which
         certificates, if so required by any securities exchange upon which any
         Registrable Securities are listed, shall be penned, lithographed or
         engraved, or produced by any combination of such methods, on steel
         engraved borders, and which certificates shall not bear any restrictive
         legends; and, in the case of an underwritten offering, enable such
         Registrable Securities to be in such denominations and registered in
         such names as the managing underwriters may request at least two
         business days prior to any sale of the Registrable Securities;

            (xv) provide a CUSIP number for all Registrable Securities, not
         later than the applicable Effective Time;

            (xvi) enter into one or more underwriting agreements, engagement
         letters, agency agreements, "best efforts" underwriting agreements or
         similar agreements, as appropriate, including customary provisions
         relating to indemnification and contribution, and take such other
         actions in connection therewith as any Electing Holders aggregating at
         least 20% in aggregate principal amount of the Registrable Securities
         at the time outstanding shall request in order to expedite or
         facilitate the disposition of such Registrable Securities;

            (xvii) whether or not an agreement of the type referred to in
         Section 3(c)(xvi) hereof is entered into and whether or not any portion
         of the offering contemplated by the Shelf Registration is an
         underwritten offering or is made through a placement or sales agent or
         any other entity, (A) make such representations and warranties to the
         Electing Holders and the placement or sales agent, if any, therefor and
         the underwriters, if any, thereof in form, substance and scope as are
         customarily made in connection with an offering of debt securities
         pursuant to any appropriate agreement or to a registration statement
         filed on the form applicable to the Shelf Registration; (B) obtain an
         opinion of counsel to the Company in customary form (including as to
         limitations on that opinion and with respect to assumptions on which
         such opinion is based) and covering such matters, of the type
         customarily covered by such an opinion, as the managing underwriters,
         if any, or as any Electing Holders of at least 20% in aggregate
         principal amount of the Registrable Securities at the time outstanding
         may reasonably request, addressed to such Electing Holder or Electing
         Holders and the placement or sales agent, if any, therefor and the
         underwriters, if any, thereof and dated the effective date of such
         Shelf Registration Statement (and if such

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         Shelf Registration Statement contemplates an underwritten offering of a
         part or all of the Registrable Securities, dated the date of the
         closing under the underwriting agreement relating thereto) (it being
         agreed that the matters to be covered by such opinion shall include the
         due incorporation and good standing of the Company and its
         subsidiaries; the qualification of the Company and its subsidiaries to
         transact business as foreign corporations; the due authorization,
         execution and delivery of the relevant agreement of the type referred
         to in Section 3(c)(xvi) hereof; the due authorization, execution,
         authentication and issuance, and the validity and enforceability, of
         the Securities; the absence of material legal or governmental
         proceedings involving the Company; the absence of a breach by the
         Company or any of its subsidiaries of, or a default under, material
         agreements binding upon the Company or any subsidiary of the Company;
         the absence of governmental approvals required to be obtained in
         connection with the Shelf Registration, the offering and sale of the
         Registrable Securities, this Agreement or any agreement of the type
         referred to in Section 3(c)(xvi) hereof, except such approvals as may
         be required under state securities or blue sky laws; the material
         compliance as to form of such Shelf Registration Statement and any
         documents incorporated by reference therein and of the Exchange Note
         Indenture with the requirements of the Securities Act and the Trust
         Indenture Act and the rules and regulations of the Commission
         thereunder, respectively; and, as of the date of the opinion and of the
         Shelf Registration Statement or most recent post-effective amendment
         thereto, as the case may be, the absence from such Shelf Registration
         Statement and the prospectus included therein, as then amended or
         supplemented, and from the documents incorporated by reference therein
         (in each case other than the financial statements and other financial
         information contained therein) of an untrue statement of a material
         fact or the omission to state therein a material fact necessary to make
         the statements therein not misleading (in the case of such documents,
         in the light of the circumstances existing at the time that such
         documents were filed with the Commission under the Exchange Act)); (C)
         obtain a "cold comfort" letter or letters from the independent
         certified public accountants of the Company addressed to the selling
         Electing Holders, the placement or sales agent, if any, therefor or the
         underwriters, if any, thereof, dated (i) the effective date of such
         Shelf Registration Statement and (ii) the effective date of any
         prospectus supplement to the prospectus included in such Shelf
         Registration Statement or post-effective amendment to such Shelf
         Registration Statement which includes unaudited or audited financial
         statements as of a date or for a period subsequent to that of the
         latest such statements included in such prospectus (and, if such Shelf
         Registration Statement contemplates an underwritten offering pursuant
         to any prospectus supplement to the prospectus included in such Shelf
         Registration Statement or post-effective amendment to such Shelf
         Registration Statement which includes unaudited or audited financial
         statements as of a date or for a period subsequent to that of the
         latest such statements included in such prospectus, dated the date of
         the closing under the underwriting agreement relating thereto), such
         letter or letters to be in customary form (including as to limitations
         and assumptions) and covering such matters of the type customarily
         covered by letters of such type; (D) deliver such documents and
         certificates, including officers' certificates, as may be reasonably
         requested by any Electing Holders of at least 20% in aggregate
         principal amount of the Registrable Securities at the time outstanding
         or the placement or sales agent, if any, therefor and

                                      B-10
<PAGE>

         the managing underwriters, if any, thereof to evidence the accuracy of
         the representations and warranties made pursuant to clause (A) above or
         those contained in Section 5(a) hereof and the compliance with or
         satisfaction of any agreements or conditions contained in the
         underwriting agreement or other agreement entered into by the Company
         or the Guarantor; and (E) undertake such obligations relating to
         expense reimbursement, indemnification and contribution as are provided
         in Section 6 hereof;

            (xviii) notify in writing each holder of Registrable Securities of
         any proposal by the Company to amend or waive any provision of this
         Agreement pursuant to Section 9(h) hereof and of any amendment or
         waiver effected pursuant thereto, each of which notices shall contain
         the text of the amendment or waiver proposed or effected, as the case
         may be;

            (xix) in the event that any broker-dealer registered under the
         Exchange Act shall underwrite any Registrable Securities or participate
         as a member of an underwriting syndicate or selling group or "assist in
         the distribution" (within the meaning of the Conduct Rules (the
         "CONDUCT RULES") of the National Association of Securities Dealers,
         Inc. ("NASD") or any successor thereto, as amended from time to time)
         thereof, whether as a holder of such Registrable Securities or as an
         underwriter, a placement or sales agent or a broker or dealer in
         respect thereof, or otherwise, assist such broker-dealer in complying
         with the requirements of such Conduct Rules, including by (A) if such
         Conduct Rules shall so require, engaging a "qualified independent
         underwriter" (as defined in such Conduct Rules) to participate in the
         preparation of the Shelf Registration Statement relating to such
         Registrable Securities, to exercise usual standards of due diligence in
         respect thereto and, if any portion of the offering contemplated by
         such Shelf Registration Statement is an underwritten offering or is
         made through a placement or sales agent, to recommend the yield of such
         Registrable Securities, (B) indemnifying any such qualified independent
         underwriter to the extent of the indemnification of underwriters
         provided in Section 6 hereof (or to such other customary extent as may
         be requested by such underwriter), and (C) providing such information
         to such broker-dealer as may be required in order for such
         broker-dealer to comply with the requirements of the Conduct Rules; and

            (xx) comply with all applicable rules and regulations of the
         Commission, and make generally available to its securityholders as soon
         as practicable but in any event not later than eighteen months after
         the effective date of such Shelf Registration Statement, an earning
         statement of the Company and its subsidiaries complying with Section
         11(a) of the Securities Act (including, at the option of the Company,
         Rule 158 thereunder).

      (d) In the event that the Company would be required, pursuant to Section
   3(c)(viii)(F) above, to notify the Electing Holders, the placement or sales
   agent, if any, therefor and the managing underwriters, if any, thereof, the
   Company shall without delay prepare and furnish to each of the Electing
   Holders, to each placement or sales agent, if any, and to each such
   underwriter, if any, a reasonable number of copies of a prospectus
   supplemented or amended so that, as thereafter delivered to purchasers of
   Registrable Securities, such prospectus shall

                                      B-11
<PAGE>

   conform in all material respects to the applicable requirements of the
   Securities Act and the Trust Indenture Act and the rules and regulations of
   the Commission thereunder and shall 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 in light of the
   circumstances then existing. Each Electing Holder agrees that upon receipt of
   any notice from the Company pursuant to Section 3(c)(viii)(F) hereof, such
   Electing Holder shall forthwith discontinue the disposition of Registrable
   Securities pursuant to the Shelf Registration Statement applicable to such
   Registrable Securities until such Electing Holder shall have received copies
   of such amended or supplemented prospectus, and if so directed by the
   Company, such Electing Holder shall deliver to the Company (at the Company's
   expense) all copies, other than permanent file copies, then in such Electing
   Holder's possession of the prospectus covering such Registrable Securities at
   the time of receipt of such notice.

      (e) In the event of a Shelf Registration, in addition to the information
   required to be provided by each Electing Holder in its Notice Questionnaire,
   the Company may require such Electing Holder to furnish to the Company such
   additional information regarding such Electing Holder and such Electing
   Holder's intended method of distribution of Registrable Securities as may be
   required in order to comply with the Securities Act. Each such Electing
   Holder agrees to notify the Company as promptly as practicable of any
   inaccuracy or change in information previously furnished by such Electing
   Holder to the Company or of the occurrence of any event in either case as a
   result of which any prospectus relating to such Shelf Registration contains
   or would contain an untrue statement of a material fact regarding such
   Electing Holder or such Electing Holder's intended method of disposition of
   such Registrable Securities or omits to state any material fact regarding
   such Electing Holder or such Electing Holder's intended method of disposition
   of such Registrable Securities required to be stated therein or necessary to
   make the statements therein not misleading in light of the circumstances then
   existing, and promptly to furnish to the Company any additional information
   required to correct and update any previously furnished information or
   required so that such prospectus shall not contain, with respect to such
   Electing Holder or the disposition of such Registrable Securities, 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 in
   light of the circumstances then existing.

      (f) Until the expiration of two years after the Closing Date, the Company
   will not, and will not permit any of its "affiliates" (as defined in Rule
   144) to, resell any of the Securities that have been resold pursuant to an
   effective registration statement but subsequently reacquired by any of them
   except pursuant to an effective registration statement under the Securities
   Act.

       4. REGISTRATION EXPENSES. The Company agrees to bear and to pay or cause
to be paid promptly all expenses incident to the Company's performance of or
compliance with this Agreement, including (a) all Commission and any NASD
registration, filing and review fees and expenses including fees and
disbursements of one counsel for the placement or sales agent or underwriters in
connection with such registration, filing and review, (b) all fees and expenses
in connection with the qualification of the Securities for offering and sale
under the State securities and blue sky laws referred to in Section 3(c)(xii)
hereof and determination of their eligibility for investment under the laws of
such jurisdictions in the United States as any managing

                                      B-12
<PAGE>

underwriters or the Electing Holders may designate, including any fees and
disbursements of one counsel for the Electing Holders (selected by the majority
of Electing Holders) or underwriters in connection with such qualification and
determination, (c) all expenses relating to the preparation, printing,
production, distribution and reproduction of each registration statement
required to be filed hereunder, each prospectus included therein or prepared for
distribution pursuant hereto, each amendment or supplement to the foregoing, the
expenses of preparing the Securities for delivery and the expenses of printing
or producing any underwriting agreements, agreements among underwriters, selling
agreements and blue sky or legal investment memoranda and all other documents in
connection with the offering, sale or delivery of Securities to be disposed of
(including certificates representing the Securities), (d) messenger, telephone
and delivery expenses relating to the offering, sale or delivery of Securities
and the preparation of documents referred in clause (c) above, (e) fees and
expenses of the Trustee under the Exchange Note Indenture, any agent of the
Trustee and any counsel for the Trustee and of any collateral agent or
custodian, (f) internal expenses (including all salaries and expenses of the
Company's officers and employees performing legal or accounting duties), (g)
fees, disbursements and expenses of counsel and independent certified public
accountants of the Company (including the expenses of any opinions or "cold
comfort" letters required by or incident to such performance and compliance),
(h) fees, disbursements and expenses of any "qualified independent underwriter"
engaged pursuant to Section 3(c)(xix) hereof, (i) fees, disbursements and
expenses of one counsel for the Electing Holders retained in connection with a
Shelf Registration, as selected by the Electing Holders of at least a majority
in aggregate principal amount of the Registrable Securities held by Electing
Holders (which counsel shall be reasonably satisfactory to the Company), (j) any
fees charged by securities rating services for rating the Securities, and (k)
fees, expenses and disbursements of any other persons, including special
experts, retained by the Company in connection with such registration
(collectively, the "REGISTRATION EXPENSES"). To the extent that any Registration
Expenses are incurred, assumed or paid by any holder of Registrable Securities
or any placement or sales agent therefor or underwriter thereof, the Company
shall reimburse such person for the full amount of the Registration Expenses so
incurred, assumed or paid promptly after receipt of a request therefor.
Notwithstanding the foregoing, the holders of the Registrable Securities being
registered shall pay all agency fees and commissions and underwriting discounts
and commissions attributable to the sale of such Registrable Securities and the
fees and disbursements of any counsel or other advisors or experts retained by
such holders (severally or jointly), other than the counsel and experts
specifically referred to above.

      5. REPRESENTATIONS AND WARRANTIES. The Company and the Guarantors
represent and warrant to, and agree with, the Arranger, the Administrative Agent
and each Lender and each of the holders from time to time of Registrable
Securities that:

      (a) Each registration statement covering Registrable Securities and each
   prospectus (including any preliminary or summary prospectus) contained
   therein or furnished pursuant to Section 3(c) or Section 3(d) hereof and any
   further amendments or supplements to any such registration statement or
   prospectus, when it becomes effective or is filed with the Commission, as the
   case may be, and, in the case of an underwritten offering of Registrable
   Securities, at the time of the closing under the underwriting agreement
   relating thereto, will conform in all material respects to the requirements
   of the Securities Act and the Trust Indenture Act and the rules and
   regulations of the Commission thereunder and will not contain an untrue
   statement of a material fact or omit to state a material fact required to be

                                      B-13
<PAGE>

   stated therein or necessary to make the statements therein not misleading;
   and at all times subsequent to the Effective Time when a prospectus would be
   required to be delivered under the Securities Act, other than from (i) such
   time as a notice has been given to holders of Registrable Securities pursuant
   to Section 3(c)(viii)(F) hereof until (ii) such time as the Company furnishes
   an amended or supplemented prospectus pursuant to Section 3(d) or Section
   hereof, each such registration statement, and each prospectus (including any
   summary prospectus) contained therein or furnished pursuant to Section 3(c)
   hereof, as then amended or supplemented, will conform in all material
   respects to the requirements of the Securities Act and the Trust Indenture
   Act and the rules and regulations of the Commission thereunder and will not
   contain an untrue statement of a material fact or omit to state a material
   fact required to be stated therein or necessary to make the statements
   therein not misleading in the light of the circumstances then existing;
   provided, however, that this representation and warranty shall not apply to
   any statements or omissions made in reliance upon and in conformity with
   information furnished in writing to the Company by a holder of Registrable
   Securities expressly for use therein.

      (b) Any documents incorporated by reference in any prospectus referred to
   in Section 5(a) hereof, when they become or became effective or are or were
   filed with the Commission, as the case may be, will conform or conformed in
   all material respects to the requirements of the Securities Act or the
   Exchange Act, as applicable, and none of such documents will contain or
   contained an untrue statement of a material fact or will omit or omitted to
   state a material fact required to be stated therein or necessary to make the
   statements therein not misleading; provided, however, that this
   representation and warranty shall not apply to any statements or omissions
   made in reliance upon and in conformity with information furnished in writing
   to the Company by a holder of Registrable Securities expressly for use
   therein.

      (c) The compliance by the Company with all of the provisions of this
   Agreement and the consummation of the transactions herein contemplated will
   not conflict with or result in a breach of any of the terms or provisions of,
   or constitute a default under, any indenture, mortgage, deed of trust, loan
   agreement or other agreement or instrument to which the Company or any
   subsidiary of the Company is a party or by which the Company or any
   subsidiary of the Company is bound or to which any of the property or assets
   of the Company or any subsidiary of the Company is subject, nor will such
   action result in any violation of the provisions of the certificate of
   incorporation, as amended, or the by-laws of the Company or the Guarantors or
   any statute or any order, rule or regulation of any court or governmental
   agency or body having jurisdiction over the Company or any subsidiary of the
   Company or any of their properties; and no consent, approval, authorization,
   order, registration or qualification of or with any such court or
   governmental agency or body is required for the consummation by the Company
   and the Guarantors of the transactions contemplated by this Agreement, except
   the registration under the Securities Act of the Securities, qualification of
   the Exchange Note Indenture under the Trust Indenture Act and such consents,
   approvals, authorizations, registrations or qualifications as may be required
   under State securities or blue sky laws in connection with the offering and
   distribution of the Securities.

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

      6. INDEMNIFICATION.

                                      B-14
<PAGE>

      (a) Indemnification by the Company and the Guarantors. The Company and
   each of the Guarantors, jointly and severally, will indemnify and hold
   harmless each of the holders of Registrable Securities included in an
   Exchange Registration Statement, each of the Electing Holders of Registrable
   Securities included in a Shelf Registration Statement and each person who
   participates as a placement or sales agent or as an underwriter in any
   offering or sale of such Registrable Securities against any losses, claims,
   damages or liabilities, joint or several, to which such holder, agent or
   underwriter may become subject under the Securities Act or otherwise, insofar
   as such losses, claims, damages or liabilities (or actions in respect
   thereof) arise out of or are based upon an untrue statement or alleged untrue
   statement of a material fact contained in any Exchange Registration Statement
   or Shelf Registration Statement, as the case may be, under which such
   Registrable Securities were registered under the Securities Act, or any
   preliminary, final or summary prospectus contained therein or furnished by
   the Company to any such holder, Electing Holder, agent or underwriter, or any
   amendment or supplement thereto, or arise out of or are based upon the
   omission or alleged omission to state therein a material fact required to be
   stated therein or necessary to make the statements therein not misleading,
   and will reimburse such holder, such Electing Holder, such agent and such
   underwriter for any legal or other expenses reasonably incurred by them in
   connection with investigating or defending any such action or claim as such
   expenses are incurred; provided, however, that none of the Company or any
   Guarantor shall be liable to any such person in any such case to the extent
   that any such loss, claim, damage or liability arises out of or is based upon
   an untrue statement or alleged untrue statement or omission or alleged
   omission made in such registration statement, or preliminary, final or
   summary prospectus, or amendment or supplement thereto, in reliance upon and
   in conformity with written information furnished to the Company by such
   person expressly for use therein.

      (b) Indemnification by the Holders and any Agents and Underwriters. The
   Company may require, as a condition to including any Registrable Securities
   in any registration statement filed pursuant to Section 2(a) hereof and to
   entering into any underwriting agreement with respect thereto, that the
   Company shall have received an undertaking reasonably satisfactory to it from
   the Electing Holder of such Registrable Securities and from each underwriter
   named in any such underwriting agreement, severally and not jointly, to (i)
   indemnify and hold harmless the Company, each Guarantor, and all other
   holders of Registrable Securities, against any losses, claims, damages or
   liabilities to which the Company, the Guarantors or such other holders of
   Registrable Securities may become subject, under the Securities Act or
   otherwise, insofar as such losses, claims, damages or liabilities (or actions
   in respect thereof) arise out of or are based upon an untrue statement or
   alleged untrue statement of a material fact contained in such registration
   statement, or any preliminary, final or summary prospectus contained therein
   or furnished by the Company to any such Electing Holder, agent or
   underwriter, or any amendment or supplement thereto, or arise out of or are
   based upon the omission or alleged omission to state therein a material fact
   required to be stated therein or necessary to make the statements therein not
   misleading, in each case to the extent, but only to the extent, that such
   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 by such Electing Holder or underwriter expressly for
   use therein, and (ii) reimburse the Company and the Guarantors for any legal
   or other expenses reasonably incurred by the Company and the Guarantors in
   connection with investigating or defending any such action or claim as such
   expenses are incurred; provided, however, that no such Electing Holder shall
   be required to undertake liability to any person

                                      B-15
<PAGE>

   under this Section 6(b) for any amounts in excess of the dollar amount of the
   proceeds to be received by such Electing Holder from the sale of such
   Electing Holder's Registrable Securities pursuant to such registration.

      (c) Notices of Claims, Etc. Promptly after receipt by an indemnified party
   under subsection (a) or (b) above of written notice of the commencement of
   any action, such indemnified party shall, if a claim in respect thereof is to
   be made against an indemnifying party pursuant to the indemnification
   provisions of or contemplated by this Section 6, notify such indemnifying
   party in writing of the commencement of such action; but the omission so to
   notify the indemnifying party shall not relieve it from any liability which
   it may have to any indemnified party otherwise than under the indemnification
   provisions of or contemplated by Section 6(a) or 6(b) hereof. In case any
   such action shall be brought against any indemnified party and it shall
   notify an indemnifying party of the commencement thereof, such indemnifying
   party shall be entitled to participate therein and, to the extent that it
   shall wish, jointly with any other indemnifying party similarly notified, to
   assume the defense thereof, with counsel reasonably satisfactory to such
   indemnified party (who shall not, except with the consent of the indemnified
   party, be counsel to the indemnifying party), and, after notice from the
   indemnifying party to such indemnified party of its election so to assume the
   defense thereof, such indemnifying party shall not be liable to such
   indemnified party for any legal expenses of other counsel or any other
   expenses, in each case subsequently incurred by such indemnified party, in
   connection with the defense thereof other than reasonable costs of
   investigation. No indemnifying party shall, without the written consent of
   the indemnified party, effect the settlement or compromise of, or consent to
   the entry of any judgment with respect to, any pending or threatened action
   or claim in respect of which indemnification or contribution may be sought
   hereunder (whether or not the indemnified party is an actual or potential
   party to such action or claim) unless such settlement, compromise or judgment
   (i) includes an unconditional release of the indemnified party from all
   liability arising out of such action or claim and (ii) does not include a
   statement as to or an admission of fault, culpability or a failure to act by
   or on behalf of any indemnified party.

      (d) Contribution. If for any reason the indemnification provisions
   contemplated by Section 6(a) or Section 6(b) are unavailable to or
   insufficient to hold harmless an indemnified party in respect of any losses,
   claims, damages or liabilities (or actions in respect thereof) referred to
   therein, then each indemnifying party shall contribute to the amount paid or
   payable by such indemnified party as a result of such losses, claims, damages
   or liabilities (or actions in respect thereof) in such proportion as is
   appropriate to reflect the relative fault of the indemnifying party and the
   indemnified party in connection with the statements or omissions which
   resulted in such losses, claims, damages or liabilities (or actions in
   respect thereof), as well as any other relevant equitable considerations. The
   relative fault of such indemnifying party and indemnified party shall be
   determined by reference to, among other things, 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 such indemnifying party or
   by such indemnified party, and the parties' relative intent, knowledge,
   access to information and opportunity to correct or prevent such statement or
   omission. The parties hereto agree that it would not be just and equitable if
   contributions pursuant to this Section 6(d) were determined by pro rata
   allocation (even if the holders or any agents or underwriters or all of them
   were treated as one entity for such purpose) or by any other method of

                                      B-16
<PAGE>

   allocation which does not take account of the equitable considerations
   referred to in this Section 6(d). The amount paid or payable by an
   indemnified party as a result of the losses, claims, damages, or liabilities
   (or actions in respect thereof) referred to above shall be deemed to include
   any legal or other fees or expenses reasonably incurred by such indemnified
   party in connection with investigating or defending any such action or claim.
   Notwithstanding the provisions of this Section 6(d), no holder shall be
   required to contribute any amount in excess of the amount by which the dollar
   amount of the proceeds received by such holder from the sale of any
   Registrable Securities (after deducting any fees, discounts and commissions
   applicable thereto) exceeds the amount of any damages which such holder has
   otherwise been required to pay by reason of such untrue or alleged untrue
   statement or omission or alleged omission, and no underwriter shall be
   required to contribute any amount in excess of the amount by which the total
   price at which the Registrable Securities underwritten by it and distributed
   to the public were offered to the public exceeds the amount of any damages
   which such underwriter has otherwise been required to pay by reason of such
   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 holders' and any
   underwriters' obligations in this Section 6(d) to contribute shall be several
   in proportion to the principal amount of Registrable Securities registered or
   underwritten, as the case may be, by them and not joint.

      (e) The obligations of the Company and the Guarantors under this Section 6
   shall be in addition to any liability which the Company or any Guarantor may
   otherwise have and shall extend, upon the same terms and conditions, to each
   officer, director and partner of each holder, agent and underwriter and each
   person, if any, who controls any holder, agent or underwriter within the
   meaning of the Securities Act; and the obligations of the holders and any
   agents or underwriters contemplated by this Section 6 shall be in addition to
   any liability which the respective holder, agent or underwriter may otherwise
   have and shall extend, upon the same terms and conditions, to each officer
   and director of the Company and each Guarantor (including any person who,
   with his consent, is named in any registration statement as about to become a
   director of the Company or the Guarantor) and to each person, if any, who
   controls the Company within the meaning of the Securities Act.

      7. UNDERWRITTEN OFFERINGS.

      (a) Selection of Underwriters. If any of the Registrable Securities
   covered by the Shelf Registration are to be sold pursuant to an underwritten
   offering, the managing underwriter or underwriters thereof shall be
   designated by Electing Holders holding at least a majority in aggregate
   principal amount of the Registrable Securities to be included in such
   offering, provided that such designated managing underwriter or underwriters
   is or are reasonably acceptable to the Company.

      (b) Participation by Holders. Each holder of Registrable Securities hereby
   agrees with each other such holder that no such holder may participate in any
   underwritten offering hereunder unless such holder (i) agrees to sell such
   holder's Registrable Securities on the basis provided in any underwriting
   arrangements approved by the persons entitled hereunder to approve such
   arrangements and (ii) completes and executes all questionnaires, powers of

                                      B-17
<PAGE>

   attorney, indemnities, underwriting agreements and other documents reasonably
   required under the terms of such underwriting arrangements.

      8. RULE 144.

         The Company covenants to the holders of Registrable Securities that to
the extent it shall be required to do so under the Exchange Act, the Company
shall timely file the reports required to be filed by it under the Exchange Act
or the Securities Act (including the reports under Section 13 and 15(d) of the
Exchange Act referred to in subparagraph (c)(1) of Rule 144 adopted by the
Commission under the Securities Act) and the rules and regulations adopted by
the Commission thereunder, and shall take such further action as any holder of
Registrable Securities may reasonably request, all to the extent required from
time to time to enable such holder to sell Registrable Securities without
registration under the Securities Act within the limitations of the exemption
provided by Rule 144 under the Securities Act, as such Rule may be amended from
time to time, or any similar or successor rule or regulation hereafter adopted
by the Commission. Upon the request of any holder of Registrable Securities in
connection with that holder's sale pursuant to Rule 144, the Company shall
deliver to such holder a written statement as to whether it has complied with
such requirements.

      9. MISCELLANEOUS.

      (a) No Inconsistent Agreements. The Company represents, warrants,
   covenants and agrees that it has not granted, and shall not grant,
   registration rights with respect to Registrable Securities or any other
   securities which would be inconsistent with the terms contained in this
   Agreement.

      (b) Specific Performance. The parties hereto acknowledge that there would
   be no adequate remedy at law if the Company or any Guarantor fails to perform
   any of its obligations hereunder and that the Lenders and the holders from
   time to time of the Registrable Securities may be irreparably harmed by any
   such failure, and accordingly agree that the Lenders and such holders, in
   addition to any other remedy to which they may be entitled at law or in
   equity, shall be entitled to compel specific performance of the obligations
   of the Company under this Agreement in accordance with the terms and
   conditions of this Agreement, in any court of the United States or any State
   thereof having jurisdiction.

      (c) Notices. All notices, requests, claims, demands, waivers and other
   communications hereunder shall be in writing and shall be deemed to have been
   duly given when delivered by hand, if delivered personally or by courier, or
   three days after being deposited in the mail (registered or certified mail,
   postage prepaid, return receipt requested) as follows:

                 (i) if to a holder of Registrable Securities, at the most
            current address set forth in the security register or other records
            of the Company, or to such other address as the Company or any such
            holder may have furnished to the other in writing in accordance
            herewith (except that notices of change of address shall be
            effective only upon receipt), which address initially is, with
            respect to the Arranger to it at the address set forth in the Credit
            Agreement, with a copy to Latham & Watkins LLP, 885 Third Avenue,
            Suite 1000, New York, New York 10022, Attention: Hendrik de Jong;
            and

                                      B-18
<PAGE>

                 (ii) if to Company, initially to them at the address set forth
            in the Credit Agreement and thereafter at such other address, notice
            of which is given in accordance with the provisions of this Section,
            with a copy to Patton Boggs LLP, 1660 Lincoln Street, Suite 1900,
            Denver, Colorado 80264 Attn.: Alan Talesnick.

      (d) Parties in Interest. All the terms and provisions of this Agreement
   shall be binding upon, shall inure to the benefit of and shall be enforceable
   by the parties hereto and the holders from time to time of the Registrable
   Securities and the respective successors and assigns of the parties hereto
   and such holders. In the event that any transferee of any holder of
   Registrable Securities shall acquire Registrable Securities, in any manner,
   whether by gift, bequest, purchase, operation of law or otherwise, such
   transferee shall, without any further writing or action of any kind, be
   deemed a beneficiary hereof for all purposes and such Registrable Securities
   shall be held subject to all of the terms of this Agreement, and by taking
   and holding such Registrable Securities such transferee shall be entitled to
   receive the benefits of, and be conclusively deemed to have agreed to be
   bound by all of the applicable terms and provisions of this Agreement. If the
   Company shall so request, any such successor, assign or transferee shall
   agree in writing to acquire and hold the Registrable Securities subject to
   all of the applicable terms hereof.

      (e) Survival. The respective indemnities, agreements, representations,
   warranties and each other provision set forth in this Agreement or made
   pursuant hereto shall remain in full force and effect regardless of any
   investigation (or statement as to the results thereof) made by or on behalf
   of any holder of Registrable Securities, any director, officer or partner of
   such holder, any agent or underwriter or any director, officer or partner
   thereof, or any controlling person of any of the foregoing, and shall survive
   delivery of and payment for the Registrable Securities pursuant to the
   Purchase Agreement and the transfer and registration of Registrable
   Securities by such holder and the consummation of an Exchange Offer.

      (F) GOVERNING LAW. THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN
   ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.

      (g) Headings. The descriptive headings of the several Sections and
   paragraphs of this Agreement are inserted for convenience only, do not
   constitute a part of this Agreement and shall not affect in any way the
   meaning or interpretation of this Agreement.

      (h) Entire Agreement; Amendments. This Agreement and the other writings
   referred to herein (including the Exchange Note Indenture and the form of
   Securities) or delivered pursuant hereto which form a part hereof contain the
   entire understanding of the parties with respect to its subject matter. This
   Agreement supersedes all prior agreements and understandings between the
   parties with respect to its subject matter. This Agreement may be amended and
   the observance of any term of this Agreement may be waived (either generally
   or in a particular instance and either retroactively or prospectively) only
   by a written instrument duly executed by the Company and the holders of at
   least a majority in aggregate principal amount of the Registrable Securities
   at the time outstanding. Each holder of any Registrable Securities at the
   time or thereafter outstanding shall be bound by any amendment or waiver
   effected pursuant to this Section 9(h), whether or not any notice, writing or
   marking indicating such amendment or waiver appears on such Registrable
   Securities or is delivered to such holder.

                                      B-19
<PAGE>

      (i) Inspection. For so long as this Agreement shall be in effect, this
   Agreement and a complete list of the names and addresses of all the holders
   of Registrable Securities shall be made available for inspection and copying
   on any business day by any holder of Registrable Securities for proper
   purposes only (which shall include any purpose related to the rights of the
   holders of Registrable Securities under the Securities, the Exchange Note
   Indenture and this Agreement) at the offices of the Company at the address
   thereof set forth in Section 9(c) above and at the office of the Trustee
   under the Exchange Note Indenture.

      (j) Counterparts. This agreement may be executed by the parties in
   counterparts, each of which shall be deemed to be an original, but all such
   respective counterparts shall together constitute one and the same
   instrument.

                                      B-20
<PAGE>

      If the foregoing is in accordance with your understanding, please sign and
return to us six counterparts hereof, and upon the acceptance hereof by the
Arranger, on behalf of each of the Lenders, this letter and such acceptance
hereof shall constitute a binding agreement among the Company, the Guarantors,
the Arranger and each Lender under the Credit Agreement.

                                        Very truly yours,

                                        BILL BARRETT CORPORATION

                                        By: /s/ THOMAS B. TYREE, JR.
                                           -------------------------------------
                                           Thomas B. Tyree, Jr., Chief Financial
                                           Officer

                                        BILL BARRETT PROPERTIES INC.

                                        By: /s/ THOMAS B. TYREE, JR.
                                           -------------------------------------
                                           Thomas B. Tyree, Jr., Chief Financial
                                           Officer

                                        BILL BARRETT PRODUCTION COMPANY

                                        By: /s/ THOMAS B. TYREE, JR.
                                           -------------------------------------
                                           Thomas B. Tyree, Jr., Chief Financial
                                           Officer

GOLDMAN SACHS CREDIT PARTNERS L.P.

By: /s/ ROBERT T. WAGNER
   --------------------------------
   Robert T. Wagner, Managing Director

                                      B-21<PAGE>

                                                                 EXHIBIT 10.1(b)

                                 FIRST AMENDMENT

                                       TO

                              AMENDED AND RESTATED

                                CREDIT AGREEMENT

                          DATED AS OF SEPTEMBER 1, 2004

                                      AMONG

                            BILL BARRETT CORPORATION,

                                  AS BORROWER,

                                 THE GUARANTORS,

                              JPMORGAN CHASE BANK,

                            AS ADMINISTRATIVE AGENT,

                              FLEET NATIONAL BANK,
                                       AND
                         U.S. BANK NATIONAL ASSOCIATION,
                           AS CO- SYNDICATION AGENTS,

                         HARRIS NESBITT FINANCING, INC.,
                              ROYAL BANK OF CANADA,
                                 COMERICA BANK,
                                       AND
                      DEUTSCHE BANK TRUST COMPANY AMERICAS,
                           AS CO-DOCUMENTATION AGENTS,

                                       AND

                            THE LENDERS PARTY HERETO

<PAGE>

            FIRST AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT

      THIS FIRST AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT (this "First
Amendment") dated as of September 1, 2004, is among BILL BARRETT CORPORATION, a
Delaware corporation (the "Borrower"); each of the undersigned guarantors (the
"Guarantors", and together with the Borrower, the "Obligors"); each of the
lenders party to the Credit Agreement referred to below (collectively, the
"Lenders"); JPMorgan Chase Bank, as administrative agent for the Lenders (in
such capacity, together with its successors in such capacity, the
"Administrative Agent"); Fleet National Bank and U.S. Bank National Association,
as Co-Syndication Agents for the Lenders; and Harris Nesbitt Financing, Inc.,
Royal Bank of Canada, Comerica Bank and Deutsche Bank Trust Company Americas, as
Co-Documentation Agents for the Lenders.

                                 R E C I T A L S

      A. The Borrower, the Agents and the Lenders are parties to that certain
Amended and Restated Credit Agreement dated as of February 4, 2004 (the "Credit
Agreement"), pursuant to which the Lenders have made certain credit available to
and on behalf of the Borrower.

      B. The Borrower has proposed to acquire certain Properties pursuant to
that certain Purchase and Sale Agreement, dated as of August 17, 2004, by and
among Calpine Corporation, a Delaware corporation, and Calpine Natural Gas L.P.,
a Delaware limited partnership (the "Sellers"), and the Borrower (together with
the other documents and agreements relating thereto, the "Purchase Agreement";
the transactions contemplated thereby are herein referred to as the
"Acquisition"; and the Properties to be acquired by the Borrower pursuant to the
Acquisition are referred to herein as the "Acquisition Properties").

      C. To finance a portion of the purchase price for the Acquisition and
related fees and expenses, the Borrower will enter into that certain
$150,000,000 Senior Subordinated Credit and Guaranty Agreement dated of even
date herewith (the "Bridge Credit Agreement") among the Borrower, the
Guarantors, as subsidiary guarantors, the several lenders from time to time
parties thereto, and Goldman Sachs Credit Partners L.P., as administrative agent
for the bridge lenders, as an unsecured senior subordinated bridge financing to
the Borrower's proposed public offering of common stock or other securities of
the Borrower.

      D. The Credit Agreement restricts the Borrower from incurring indebtedness
under the Bridge Credit Agreement and from incurring indebtedness into which the
Bridge Credit Agreement Indebtedness may be converted (such indebtedness, upon
conversion being "Term Loans") or for which it may be exchanged (any such
indebtedness, upon exchange being "Exchange Notes") or other indebtedness
incurred by the Borrower to repay, in whole or in part, the aggregate amount
then outstanding under Bridge Credit Agreement, the Term Loans or the Exchange
Notes (such other indebtedness being the "Permanent Debt Securities").

      E. The Borrower has requested and the Administrative Agent and the Lenders
have agreed to certain modifications as set forth herein in order to facilitate
the financing transactions contemplated above and to make certain other changes
to the Credit Agreement.

<PAGE>

      F. NOW, THEREFORE, to induce the Agents and the Lenders to enter into this
First Amendment and in consideration of the premises and the mutual covenants
herein contained, for good and valuable consideration, the receipt and
sufficiency of which are hereby acknowledged, the parties hereto agree as
follows:

      Section 1. Defined Terms. Each capitalized term used herein but not
otherwise defined herein has the meaning given such term in the Credit
Agreement, as amended by this First Amendment. Unless otherwise indicated, all
section references in this First Amendment refer to sections of the Credit
Agreement.

      Section 2. Amendments to Credit Agreement.

      2.1 Amendments to Section 1.02.

            (a) The following definitions are hereby added where alphabetically
appropriate to read as follows:

            "Bridge Credit Agreement" means that certain Senior Subordinated
      Credit and Guaranty Agreement, dated as of September 1, 2004, by and among
      the Borrower, the Guarantors, the several lenders from time to time
      parties thereto, and Goldman Sachs Credit Partners L.P., as administrative
      agent for the lenders, as the same shall be amended, supplemented or
      otherwise modified from time to time in accordance with Section 9.04(b).

            "Equity Offering" means any issuance and sale by the Borrower,
      whether public or private, of any Equity Interests (other than
      Disqualified Capital Stock) of the Borrower or any other capital
      contribution from shareholders of the Borrower; provided that issuances of
      securities pursuant to employee benefit plans shall not be considered to
      be "Equity Offerings".

            "Exchange Indenture" means the indenture dated as of September 1,
      2004 among the Borrower, certain subsidiaries of the Borrower and Wells
      Fargo Bank, N.A., as trustee.

            "Exchange Notes" means the senior subordinated notes issued under
      the Exchange Indenture.

            "First Amendment" means that certain First Amendment to Amended and
      Restated Credit Agreement, dated as of September 1, 2004, among the
      Borrower, the Guarantors, the Agents, and the Lenders party thereto.

            "Permanent Debt Securities" means any subordinated Indebtedness
      constituting Permitted Refinancing Debt incurred in respect of the Bridge
      Credit Agreement, the Term Loans or the Exchange Notes.

            "Permitted Refinancing Debt" means Debt (for purposes of this
      definition, "new Debt") incurred in exchange for, or proceeds of which are
      used to refinance, in whole or

                                       2
<PAGE>

      in part, any other Debt (the "Refinanced Debt"); provided that (a) such
      new Debt is in an aggregate principal amount not in excess of the sum of
      (i) the aggregate principal amount then outstanding of the Refinanced Debt
      (or, if the Refinanced Debt is exchanged or acquired for an amount less
      than the principal amount thereof to be due and payable upon a declaration
      of acceleration thereof, such lesser amount) and (ii) an amount (rounded
      up to the next higher integral multiple of $5,000,000) necessary to pay
      all accrued and unpaid interest, including any interest paid in kind, any
      fees and expenses, including premiums, underwriting discounts and other
      issuance costs, related to such exchange or refinancing; (b) such new Debt
      has a stated maturity no earlier than September 1, 2010 and requires no
      scheduled amortization of principal prior to September 1, 2010; (c) such
      new Debt does not require the payment of interest in cash (excluding
      interest paid in kind, added to principal or paid as "Permitted Junior
      Securities" as defined in the Exchange Indenture) at any time prior to
      September 1, 2010 at a rate per annum in excess of 18% and a total stated
      rate per annum in excess of 20% (and for purposes of this clause original
      issue discount and Equity Interests issued to the holders of such Debt as
      consideration for the acceptance of such Debt shall not be considered
      interest) plus an additional default rate not to exceed 2% per annum; (d)
      such new Debt does not contain any covenants or defaults which are more
      onerous to the Borrower and its Subsidiaries than those imposed by the
      Refinanced Debt unless the Borrower and Guarantors shall have executed and
      delivered a contemporaneous amendment to this Agreement and the other Loan
      Documents to make comparable changes; and (e) such new Debt (and any
      guarantees thereof) is subordinated in right of payment to the
      Indebtedness (or, if applicable, the Guaranty Agreement) to at least the
      same extent as the Refinanced Debt on terms that either (i) are not in any
      respect less favorable to any of the Agents or Lenders than the provisions
      set forth in Section 9 of the Bridge Credit Agreement or Article 10 of the
      Exchange Indenture and the definitions of defined terms used therein (in
      each case as in effect on the date on which the First Amendment became
      effective) or (ii) are reasonably satisfactory to the Administrative
      Agent.

            "Subordinated Debt" means any Debt issued pursuant to Section
      9.02(i) or any Debt evidenced by the Bridge Credit Agreement, the Term
      Loans and/or the Exchange Notes and, in each case, any Permitted
      Refinancing Debt in respect thereof.

            "Subordinated Debt Documents" means: (i) in respect of the Bridge
      Credit Agreement, the Bridge Credit Agreement and the other Transaction
      Documents (as defined in the Bridge Credit Agreement), (ii) in respect of
      the Exchange Notes, the Exchange Indenture, (iii) in respect of Debt
      issued pursuant to Section 9.02(i), any document pursuant to which such
      Debt is issued, and (iv) in respect of any Permanent Debt Securities
      constituting Permitted Refinancing Debt, such other agreements and
      documents as may be executed to evidence such Indebtedness, as the same
      shall be amended, supplemented or otherwise modified from time to time in
      accordance with Section 9.04(b).

            "Term Loans" means the "Term Loans" referred to (and as defined in)
      the Bridge Credit Agreement, as in effect on the date the First Amendment
      became effective.

                                       3
<PAGE>

      (b)   The following terms are amended in their entirety:

            "Control" means the possession, directly or indirectly, of the power
      to direct or cause the direction of the management or policies of a
      Person, whether through the ability to exercise voting power, by contract
      or otherwise. For the purposes of this definition, no Person that owns
      directly or indirectly any of the Equity Interests having ordinary voting
      power for the election of the directors or other governing body of a
      Person (other than as a limited partner of such other Person) will be
      deemed to "control" merely by virtue of its ownership of such Equity
      Interests. "Controlling" and "Controlled" have meanings correlative
      thereto.

            "Commitment" means, with respect to each Lender, the commitment of
      such Lender to make Loans and to acquire participations in Letters of
      Credit hereunder, expressed as an amount representing the maximum
      aggregate amount of such Lender's Revolving Credit Exposure hereunder, as
      such commitment may be (a) modified from time to time pursuant to Section
      2.06 and (b) modified from time to time pursuant to assignments by or to
      such Lender pursuant to Section 12.04(b); and "Commitments" means the
      aggregate amount of the Commitments of all the Lenders. The amount
      representing each Lender's Commitment shall at any time be the lesser of
      (i) such Lender's Maximum Credit Amount, and (ii) such Lender's Applicable
      Percentage of the then effective Tranche A Portion and Tranche B Portion,
      as the case may be, of the Borrowing Base.

            "Reserve Report" means the Initial Reserve Report and a report, in
      form and substance reasonably satisfactory to the Administrative Agent,
      setting forth, as of each December 31st or June 30th (or such other date
      in the event of an Interim Redetermination) the oil and gas reserves
      attributable to the Oil and Gas Properties of the Borrower and the
      Subsidiaries, together with a projection of the rate of production and
      future net income, taxes, operating expenses and capital expenditures with
      respect thereto as of such date, consistent with SEC reporting
      requirements at the time, together with a supplement indicating future net
      income based upon the Administrative Agent's usual and customary pricing
      assumptions for oil and gas loans then in effect, in each case reflecting
      Swap Agreements in place with respect to such production.

            "Tranche B Portion" means that portion of the Borrowing Base equal
      to, prior to Tranche B Termination Date, $45,000,000 less (i) any optional
      reductions to such amount under Section 2.07(e) and (ii) any reductions
      resulting from the conversion or reclassification of existing Oil and Gas
      Properties owned by the Borrower or any Subsidiary to "proved, developed
      producing" with a corresponding increase in the Tranche A Portion; and,
      from and after the Tranche B Termination Date, $0.

            "Tranche B Termination Date" means the earlier to occur of (i) the
      date on which the Borrower permanently terminates all of the Tranche B
      Portion pursuant to Section 2.07(e) and pays in full all outstanding
      Tranche B Loans and (ii) November 30, 2005.

      (c) The term "Facility Amount" is hereby deleted.

                                       4
<PAGE>

      2.2 Amendment to Section 3.04(c). Section 3.04(c) is hereby amended by
inserting the following new clause (vi):

            (vi) If, at any time, after the receipt by the Borrower or any
      Subsidiary of net cash proceeds from any disposition of property which
      disposition would require (whether or not such requirement is waived) the
      Borrower or such Subsidiary to make a mandatory prepayment or an offer to
      repurchase or redeem in respect of any Subordinated Debt, then, on the
      Business Day immediately prior to the date on which such mandatory
      prepayment or offer in respect of the Subordinated Debt would otherwise
      become due and payable, the Borrower or such Subsidiary shall make a
      prepayment (and the Aggregate Maximum Credit Amounts of the Lenders shall
      automatically and permanently reduce) in an amount equal to such excess
      cash proceeds.

      2.3 Amendment to Section 8.01. Section 8.01 is hereby amended by inserting
the following Section 8.01(q).

            (q) Acquisition Notices. In the event that after the effective date
      of the First Amendment: (i) the Borrower is required or decides to
      purchase any of the Properties which had previously been excluded from the
      Acquisition Properties (as defined in the First Amendment) in accordance
      with the terms of the Purchase Agreement (as defined in the First
      Amendment), (ii) the Borrower is required to honor any preferential
      purchase right in respect of any Acquisition Property which has not been
      waived, (iii) any matter is disputed in accordance with the terms of the
      Purchase Agreement or any such disputed matter is resolved, (iv) the
      discovery of any "interest additions", (v) any material notices are
      received or delivered by the Borrower pursuant to the Purchase Agreement,
      or (vi) the Borrower and the Sellers (as defined in the First Amendment)
      calculate and agree upon the "final recapitulation statement" and "final
      recap amount" as contemplated by the Purchase Agreement, then, in each
      such case, the Borrower shall promptly give the Administrative Agent
      notice in reasonable detail of such circumstances.

      2.4 Amendment to Section 8.12. Section 8.12 is hereby amended by (i)
deleting therefrom each reference to "January 1" and substituting therefor
"December 31" and (ii) deleting therefrom the reference to "January 1st" and
substituting therefor "December 31st".

      2.5 Addition of Section 8.16. Section 8.16 is hereby added, which reads in
its entirety as follows:

            Section 8.16 Swap Agreements. On or prior to September 30, 2004, the
      Borrower shall furnish evidence to the Administrative Agent that the
      Borrower has purchased one or more Swap Agreements (i) with one or more
      Approved Counterparties, (ii) which have, if such Swap Agreements are
      floors or collars, a floor strike price and if such Swap Agreements are
      price swaps, a fixed price of not less than $4.75/MMBTU (Colorado
      Interstate Gas Rockies), and (iii) which have aggregate notional volumes
      of not less than (x) during 2005, an average of 20,000MMBTU per day, and
      (y) during 2006, an average of 25,000MMBTU per day.

                                       5
<PAGE>

      2.6 Amendment to Section 9.01. Sections 9.01(b) and 9.01(c) are hereby
deleted and the following inserted in lieu thereof:

            (b) Ratio of Total Debt to EBITDAX. The Borrower will not, as of any
      date of determination, permit its ratio of Total Debt as of such day to
      EBITDAX for the four fiscal quarters ending on the last day of the fiscal
      quarter immediately preceding such date of determination for which
      financial statements are available to be greater than (i) prior to
      November 30, 2005, 4.0 to 1.0, and (ii) thereafter, 3.5 to 1.0.

            (c) Current Ratio. The Borrower will not permit, as of the last day
      of any fiscal quarter, its ratio of (i) consolidated current assets
      (including the unused amount of the total Commitments, but excluding
      non-cash assets under FAS 133) to (ii) consolidated current liabilities
      (excluding (A) non-cash obligations under FAS 133 and (B) any amounts
      under the Bridge Credit Agreement that may be classified as current
      liabilities) to be less than 1.0 to 1.0.

      2.7 Amendment to Section 9.02(k). Section 9.02 is hereby amended by
inserting the following Section 9.02(k):

            (k) Debt under the Bridge Credit Agreement, the Term Loans, the
      Exchange Notes and Permitted Refinancing Debt in respect thereof.

      2.8 Amendment to Section 9.04(b). Section 9.04 is hereby deleted and the
following is inserted in lieu thereof:

            (b) Redemption or Repayment of Subordinated Debt. The Borrower will
      not, and will not permit any Subsidiary to, prior to the date that is one
      year after the Maturity Date: (i) call, make or offer to make any
      voluntary or optional Redemption of or otherwise voluntarily or optionally
      Redeem (whether in whole or in part) any Subordinated Debt except with the
      cash proceeds of (A) an Equity Offering (provided, that if the Borrower
      receives cash proceeds from an Equity Offering to Permitted Holders at any
      time when any prepayment is due under Section 3.04(c)(ii) or 3.04(c)(iii),
      then a portion of such cash proceeds, in an amount equal to the least of
      (x) 50% of such cash proceeds, (y) the amount due in respect of such
      required prepayment and (z) $5,000,000, shall be applied to such
      prepayment), (B) Permitted Refinancing Debt (including without limitation
      the repayment of any Debt under the Bridge Credit Agreement with the
      proceeds of the Term Loans or the Exchange Notes or any Permanent Debt
      Securities constituting Permitted Refinancing Debt) or (C) any asset sale
      to the extent not required by this Agreement to be applied to repayment of
      Indebtedness and a concurrent reduction in the Commitments; (ii) amend,
      modify, waive or otherwise change, consent or agree to any amendment,
      modification, waiver or other change to, any of the terms of any notes
      evidencing any Subordinated Debt or any indenture, agreement, instrument,
      certificate or other document (including the Bridge Credit Agreement, the
      Indenture, any other Subordinated Debt Document and any other document or
      agreement relating thereto) relating to any Subordinated Debt if (A) the
      effect of such amendment, modification or waiver is (1) to shorten the
      final maturity to a date earlier than September

                                       6
<PAGE>

      1, 2010, (2) to require any payment of principal thereof (except payments
      permitted by Section 9.04(b)(i)) on any date earlier than September 1,
      2010, or (3) to increase the rate of interest payable in cash at any time
      prior to September 1, 2010 so that the aggregate of all such interest
      payable in cash (excluding interest paid in kind, added to principal or
      paid as "Permitted Junior Securities" as defined in the Exchange
      Indenture) exceeds 18% per annum and the aggregate of all interest at any
      time prior to September 1, 2010 exceeds a 20% per annum (and for purposes
      of this clause original issue discount and Equity Interests issued to the
      holders of such Debt as consideration for the acceptance of such Debt
      shall not constitute interest) plus an additional default rate not to
      exceed 2% per annum or shorten any period for payment of any such cash
      interest or modify the method of calculating the interest rate, (B) such
      action requires the payment of a consent, amendment, waiver or other
      similar fee in excess of 2.5% in any 12-month period, (C) such action adds
      covenants or defaults to the extent more restrictive than those contained
      in the Bridge Credit Agreement or this Agreement and the other Loan
      Documents unless the Borrower and Guarantors shall have executed and
      delivered a contemporaneous amendment to this Agreement and the other Loan
      Documents to make comparable changes to this Agreement or the other Loan
      Documents, or (D) such action secures any such Debt, provided that the
      foregoing clauses (A) through (D) shall not prohibit the execution of
      agreements in connection with the issuance of Permitted Refinancing Debt
      or the addition of guarantors if required by the terms thereof; or (iii)
      designate any Debt (other than obligations of the Borrower and the
      Subsidiaries pursuant to the Loan Documents) as "Specified Senior
      Indebtedness" or "Specified Guarantor Senior Indebtedness" or give any
      such other Debt any other similar designation for the purposes of any
      indentures or other documents relating to any subordinated Debt permitted
      hereunder..

      2.9 Amendment to Section 9.16. Section 9.16 is hereby amended by deleting
the "or" prior to the beginning of subsection 9.16(e) and inserting the
following at the end thereof:

            or (f) the Bridge Credit Agreement or the Term Loans or any
      Permanent Debt Security to the extent such a limitation does not prevent
      the granting of Liens to secure the Indebtedness in an aggregate principal
      amount of less than $250,000,000 (plus interests, cost and the other
      obligations contemplated by the definition thereof), as such amount may be
      reduced after giving effect to permanent reductions in the Commitment
      resulting from asset sale repayments.

      2.10 Addition of Section 9.19. Section 9.19 is hereby added as follows:

            Section 9.19 Swap Agreement Termination. The Borrower shall maintain
      the hedged position established pursuant to Section 8.16 during the period
      specified therein and shall neither assign, terminate or unwind any such
      Swap Agreements nor sell any Swap Agreements if the effect of such action
      (when taken together with any other Swap Agreements executed
      contemporaneously with the taking of such action) would have the effect of
      canceling its positions under such Swap Agreements required by Section
      8.16; provided, however, that the foregoing shall not prevent the Borrower
      from in effect canceling its position under any specific Swap Agreement if
      the remaining Swap

                                       7
<PAGE>

      Agreements hedge, in the aggregate, notional volumes of not less than the
      amount required by this Agreement.

      2.11 Amendment to Section 11.10. Section 11.10 is hereby deleted in its
entirety and the following is inserted in lieu thereof:

            Section 11.10 The Arranger, the Syndication Agents and the
      Documentation Agents. The Arranger, the Syndication Agents and the
      Documentation Agents shall have no duties, responsibilities or liabilities
      under this Agreement and the other Loan Documents other than their duties,
      responsibilities and liabilities in their capacity as Lenders hereunder.

      2.12 Amendment to Section 12.02(b). Section 12.02(b)(iii) is hereby
amended by adding the following phrase at the end thereof:

            or amend, without the consent of the Super-Majority Lenders, Section
      9.02 to the extent the effect thereof would be to increase the amount of
      Debt the Borrower and its Subsidiaries can incur without a redetermination
      of the Borrowing Base

      2.13 Assignments of Maximum Credit Amounts; Resignation of Agent. Pursuant
to Section 12.04(b) and in lieu of the delivery of any Assignment and
Assumption, each of the following: Bank One, NA (Main Office Chicago) and
Wachovia Bank National Association (each a "Selling Lender") hereby severally
assigns and sells, as contemplated by Section 12.04(b), and each of the Lenders
on Annex I to this First Amendment (each a "Purchasing Lender") hereby severally
assumes and purchases, as contemplated by Section 12.04(b), undivided interests
in all of the Maximum Credit Amounts, Loans and L/C Exposure of each of the
Selling Lenders so that, after giving effect to all such assignments and
assumptions, the Maximum Credit Amount of each Lender will be as set forth on
Annex I to this First Amendment. The Administrative Agent waives the fee payable
to the Administrative Agent pursuant to Section 12.04(c)(ii)(C). Bank One, NA
(Main Office Chicago) hereby resigns as Co-Documentation Agent pursuant to
Section 11.06. The Borrower and the Lenders hereby waive all notice and other
conditions to such resignation set forth in Section 11.06.

      2.14 Appointment of New Agents. Each of the Lenders and each Issuing Bank
hereby irrevocably (subject to Section 11.06) appoints Harris Nesbitt Financing,
Inc., Royal Bank of Canada, Comerica Bank and Deutsche Bank Trust Company
Americas, as Co-Documentation Agents for the Lenders, and Fleet National Bank
and U.S. Bank National Association, as Co- Syndication Agents for the Lenders
and authorizes each to take such actions on its behalf and to exercise such
powers as are delegated to it by the terms of the Credit Agreement and the other
Loan Documents, if any, together with such actions and powers as are reasonably
incidental thereto. Each of the foregoing hereby accept such appointments.

      Section 3. Redetermination of Borrowing Base; Tranche A/B Portion and PV.
Subject to adjustments pursuant to Section 4.13 of this First Amendment, the
parties hereto hereby agree that (i) the amount of the Borrowing Base shall be
$200,000,000, (ii) the Tranche A Portion shall be $155,000,000, (iii) the
Tranche B Portion shall be $45,000,000, and (iv) the

                                       8
<PAGE>

Present Value for purposes of Section 9.01(d) shall be $525,000,000. Each of the
foregoing amounts shall be the new Borrowing Base effective and applicable to
the Borrower, the Agents, and the Lenders until the next redetermination or
adjustment to the Borrowing Base pursuant to and in accordance with the terms of
the Credit Agreement.

      Section 4. Conditions Precedent. This First Amendment shall not become
effective until the date on which each of the following conditions is satisfied
(or waived in accordance with Section 12.02 of the Credit Agreement) (the
"Effective Date"):

      4.1 The Administrative Agent shall have received from all of the Agents,
Lenders, and Obligors, counterparts (in such number as may be requested by the
Administrative Agent) of this First Amendment signed on behalf of such Person.

      4.2 The Administrative Agent, the Agents and the Lenders shall have
received all fees and other amounts due and payable on or prior to the date
hereof.

      4.3 The Administrative Agent shall have received duly executed Notes
payable to the order of each Lender in an amount equal to its Maximum Credit
Amount after giving effect of this First Amendment in a principal amount equal
to its Maximum Credit Amount dated as of the date hereof. Each Lender hereby
agrees to promptly deliver to the Borrower after the Effective Date the original
Note issued by such Lender as of February 4, 2004.

      4.4 The Administrative Agent shall have received from each party thereto
duly executed counterparts (in such number as may be requested by the
Administrative Agent) of the Security Instruments described in Exhibit A hereto.
In connection with the execution and delivery of such Security Instruments, the
Administrative Agent shall be reasonably satisfied that the Security Instruments
create first priority, perfected Liens (subject only to Excepted Liens
identified in clauses (e), (g) and (h) of the definition thereof, but subject to
the provisos at the end of such definition) on at least 85% of the total value
of the Oil and Gas Properties evaluated in the most recently delivered Reserve
Report and the reserve report with respect to the Acquisition Properties.

      4.5 The Administrative Agent shall have received title information as they
may reasonably require setting forth the status of title to at least 85% of the
total value of the Acquisition Properties, including copies of the releases of
Liens of the Seller on the Acquisition Properties and UCC and other Lien
searches related to the Sellers and the Acquisition Properties.

      4.6 The Administrative Agent shall be reasonably satisfied with the
environmental condition of the Acquisition Properties.

      4.7 The Agents and the Lenders shall have received the following
Engineering Reports: (i) regarding the Acquisition Properties, that certain
Reserve Report dated as of August 17, 2004 prepared by the Borrower and
evaluating the Acquisition Properties as of July 1, 2004, and (ii) regarding the
Oil and Gas Properties of the Company and its Subsidiaries, that certain Reserve
Report dated as of August 17, 2004 prepared by the Borrower and evaluating the
Oil and Gas Properties of the Company and its Subsidiaries as of June 30, 2004.

                                       9
<PAGE>

      4.8 The Administrative Agent shall have received an opinion dated as of
the date hereof of (a) Patton Boggs LLP, special counsel to the Borrower, in
form and substance reasonably satisfactory to the Administrative Agent and (b)
local counsel in the state of Colorado and any other jurisdictions requested by
the Administrative Agent, in form and substance reasonably satisfactory to the
Administrative Agent.

      4.9 The Administrative Agent shall have received a certificate of
insurance coverage of the Borrower evidencing that the Borrower is carrying
insurance in accordance with Section 7.13 of the Credit Agreement.

      4.10 The Administrative Agent shall have received satisfactory evidence
that the Borrower shall have received a gross proceeds from the Bridge Credit
Agreement of not less than $150,000,000, as may be adjusted to reflect purchase
price adjustments pursuant to the Purchase Agreement with respect to the
Acquisition, provided that if such adjustment is greater than $1,500,000, then
such adjustment shall be satisfactory to the Administrative Agent.

      4.11 The Administrative Agent shall have received copies of the Bridge
Credit Agreement (which shall be in form and substance reasonably satisfactory
to the Administrative Agent), certified by a Responsible Officer as true and
complete.

      4.12 The Agents and the Lenders shall be reasonably satisfied that (i) the
Borrower shall have received all Governmental Approvals and other approvals of
other Persons necessary or desirable for the consummation of the Acquisition and
the operation of the Acquisition Properties by the Borrower (other than those
set forth on Schedule 3.1(f) to the Purchase Agreement with respect to the
Acquisition) and (ii) there shall be no litigation pending, or to the knowledge
of the Borrower, threatened which would impair or delay the consummation of the
Acquisition.

      4.13 The Administrative Agent shall have received (a) a certificate of a
Responsible Officer of the Borrower certifying: (i) that the Borrower is
concurrently consummating the Acquisition in accordance with the terms of the
Purchase Agreement (with all of the material conditions precedent thereto having
been satisfied in all material respects by the parties thereto) and acquiring
substantially all of the Acquisition Properties contemplated thereby; (ii) as to
the final purchase price for the Acquisition Properties after giving effect to
all adjustments as of the closing date contemplated by the Purchase Agreement
and specifying, by category, the amount of such adjustment; (iii) that attached
thereto is a true and complete list of all amounts placed in escrow pursuant to
the Purchase Agreement and a description of the affected Properties and the
circumstances relating to the placement of such funds in escrow; (iv) that
attached thereto is a true and complete list of the Acquisition Properties which
have been excluded from the Acquisition pursuant to the terms of the Purchase
Agreement, specifying with respect thereto the basis of exclusion as (A) title
defect, (B) preferential purchase right or (C) environmental defects; (v) that
attached thereto is a true and complete list of all Properties for which any
Seller has elected to cure a title defect, (vi) that attached thereto is a true
and complete list of all Acquisition Properties for which the Borrower has
elected to remediate an adverse environmental condition, and (vii) that attached
thereto is a true and complete list of all Acquisition Properties which are
currently pending final decision by a third party regarding

                                       10
<PAGE>

purchase of such property in accordance with any preferential right; (b) a true
and complete executed copy of the Purchase Agreement and each other agreement or
document relating thereto; (c) original counterparts or copies, certified as
true and complete, of the assignments, deeds and leases for all of the
Acquisition Properties; and (d) such other related documents and information as
the Administrative Agent shall have reasonably requested.

      The Borrower recognizes and agrees that it shall have delivered to the
Administrative Agent a preliminary draft of the certificate described herein not
less than two (2) Business Days prior to the date hereof identifying which
Acquisition Properties will be excluded from the Acquisition. The Administrative
Agent and the Borrower shall jointly allocate a Borrowing Base value for each
such excluded Property and shall, promptly upon making such allocation, notify
the Borrower and each Lender of such allocation. If the aggregate value as
reflected in the applicable Reserve Report of Acquisition Properties excluded
under clause (iv) of the preceding paragraph is less than or equal to
$2,500,000, the Borrowing Base will not be adjusted. If either the aggregate
value as reflected in the applicable Reserve Report for the Acquisition
Properties excluded under clause (iv) of the preceding paragraph is greater than
$2,500,000 or any Acquisition Properties are excluded for other reasons or any
Seller in respect thereof makes any adjustment to the purchase price under the
Acquisition Documents, then the Administrative Agent shall suggest to the
Lenders a Borrowing Base value for each such excluded Property or such Property
subject of such adjustment and the Required Lenders shall reach a consensus as
to all allocation of value for such Property. Promptly upon the making by the
Required Lenders of such allocation, the Administrative Agent shall notify the
Borrower and each Lender of such allocation.

      4.14 No Default shall have occurred and be continuing as of the date
hereof, after giving effect to the terms of this First Amendment.

      4.15 The Administrative Agent shall have received such other documents as
the Administrative Agent or its special counsel may reasonably require.

      The Administrative Agent is hereby authorized and directed to declare this
First Amendment to be effective when it has received documents confirming or
certifying, to the satisfaction of the Administrative Agent, compliance with the
conditions set forth in this Section 4 or the waiver of such conditions as
permitted hereby. Such declaration shall be final, conclusive and binding upon
all parties to the Credit Agreement for all purposes.

      Section 5. Miscellaneous.

      5.1 Confirmation. The provisions of the Credit Agreement, as amended by
this First Amendment, shall remain in full force and effect following the
effectiveness of this First Amendment.

      5.2 Ratification and Affirmation; Representations and Warranties. Each
Obligor hereby (a) acknowledges the terms of this First Amendment; (b) ratifies
and affirms its obligations under, and acknowledges, renews and extends its
continued liability under, each Loan Document to which it is a party and agrees
that each Loan Document to which it is a party remains in full force and effect,
except as expressly amended hereby, notwithstanding the

                                       11
<PAGE>

amendments contained herein and (c) represents and warrants to the Lenders that
as of the date hereof, after giving effect to the terms of this First Amendment:
(i) all of the representations and warranties contained in each Loan Document to
which it is a party are true and correct, except to the extent any such
representations and warranties are expressly limited to an earlier date, in
which case, such representations and warranties shall continue to be true and
correct as of such specified earlier date, (ii) no Default or Event of Default
has occurred and is continuing and (iii) no event or events have occurred which
individually or in the aggregate could reasonably be expected to have a Material
Adverse Effect. The Borrower and each other Loan Party hereby (A) represents and
warrants to the Administrative Agent, each other Agent and each Lender that,
upon the due recording of the Security Instruments listed in Exhibit A attached
hereto, the Lenders have a first priority Lien on, and security interest in, Oil
and Gas Properties of the Borrower constituting at least 85% of the Present
Value of the Oil and Gas Properties of the Borrower and its consolidated
Subsidiaries as reflected in the Reserve Reported delivered pursuant to Section
4.7 of this First Amendment, and (B) confirms that it has heretofore provided to
the Administrative Agent a schedule listing the Mortgaged Properties and the
Present Value of each such Property.

      5.3 Counterparts. This First Amendment may be executed by one or more of
the parties hereto in any number of separate counterparts, and all of such
counterparts taken together shall be deemed to constitute one and the same
instrument. Delivery of this First Amendment by facsimile transmission shall be
effective as delivery of a manually executed counterpart hereof.

      5.4 No Oral Agreement. This First Amendment, the Credit Agreement and the
other Loan Documents executed in connection herewith and therewith represent the
final agreement between the parties and may not be contradicted by evidence of
prior, contemporaneous, or unwritten oral agreements of the parties. There are
no subsequent oral agreements between the parties.

      5.5 GOVERNING LAW. THIS FIRST AMENDMENT (INCLUDING, BUT NOT LIMITED TO,
THE VALIDITY AND ENFORCEABILITY HEREOF) SHALL BE GOVERNED BY, AND CONSTRUED IN
ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

      5.6 Payment of Expenses. In accordance with Section 12.03 of the Credit
Agreement, the Borrower agrees to pay or reimburse the Administrative Agent for
all of its reasonable out-of-pocket costs and reasonable expenses incurred in
connection with this First Amendment, any other documents prepared in connection
herewith and the transactions contemplated hereby, including, without
limitation, the reasonable fees and disbursements of counsel to the
Administrative Agent.

      5.7 Severability. Any provision of this First Amendment which is
prohibited or unenforceable in any jurisdiction shall, as to such jurisdiction,
be ineffective to the extent of such prohibition or unenforceability without
invalidating the remaining provisions hereof, and any such prohibition or
unenforceability in any jurisdiction shall not invalidate or render
unenforceable such provision in any other jurisdiction.

                                       12
<PAGE>

      5.8 Successors and Assigns. This Agreement shall be binding upon and inure
to the benefit of the parties hereto and their respective successors and
assigns.

                          [SIGNATURES BEGIN NEXT PAGE]

                                       13
<PAGE>

      IN WITNESS WHEREOF, the parties hereto have caused this First Amendment to
be duly executed as of the date first written above.

BORROWER:                       BILL BARRETT CORPORATION

                                By: /s/ THOMAS B. TYREE, JR.
                                   ---------------------------------------------
                                   Thomas B. Tyree, Jr., Chief Financial Officer

GUARANTORS:                     BILL BARRETT PRODUCTION COMPANY

                                By: /s/ THOMAS B. TYREE, JR.
                                   ---------------------------------------------
                                   Thomas B. Tyree, Jr., Chief Financial Officer

                                BILL BARRETT PROPERTIES INC.

                                By: /s/ THOMAS B. TYREE, JR.
                                   ---------------------------------------------
                                   Thomas B. Tyree, Jr., Chief Financial Officer

<PAGE>

AGENTS AND LENDERS:             JPMORGAN CHASE BANK, as a Lender and as
                                Administrative Agent

                                By: /s/ ROBERT C. MERTENSOTTO
                                    ----------------------------------------
                                    Robert C. Mertensotto, Managing Director

<PAGE>

                                       HARRIS NESBITT FINANCING, INC.,
                                       as a Lender and as Co-Documentation Agent

                                       By: /s/ JAMES V. DUCOTE
                                           -------------------------------------
                                           James V. Ducote, Vice President

<PAGE>

                                       ROYAL BANK OF CANADA,
                                       as a Lender and as Co-Documentation Agent

                                       By: /s/ LORNE GARTNER
                                           -------------------------------------
                                           Lorne Gartner, Authorized Signatory

<PAGE>

                                       COMERICA BANK,
                                       as a Lender and as Co-Documentation Agent

                                       By: /s/ PETER L. SELZIK
                                           -------------------------------------
                                           Peter L. Selzik, Vice President

<PAGE>

                                       DEUTSCHE BANK TRUST COMPANY
                                       AMERICAS, as a Lender and as
                                       Co-Documentation Agent

                                       By: /s/ CECIL S. HAYES
                                           -------------------------------------
                                           Cecil S. Hayes, Managing Director

<PAGE>

                                       FLEET NATIONAL BANK,
                                       as a Lender and as Co-Syndication Agent

                                       By: /s/ MICHAEL J. BROCHETTI
                                           ------------------------------------
                                           Michael J. Brochetti, Director

<PAGE>

                                       U.S. BANK NATIONAL ASSOCIATION,
                                       as a Lender and as Co-Syndication Agent

                                       By: /s/ CHARLES S. SEARLE
                                           -------------------------------------
                                           Charles S. Searle, Sr. Vice President
<PAGE>

      EXITING LENDERS AND RESIGNING AGENTS:

      SOLELY FOR PURPOSES OF SECTION 2.13 AND THE ASSIGNMENTS AND RESIGNATIONS
CONTEMPLATED THEREBY:

                                    BANK ONE, NA (MAIN OFFICE CHICAGO),
                                    as an Exiting Lender and as a Resigning
                                    Co-Documentation Agent

                                    By: /s/ ROBERT C. MERTENSOTTO
                                        ----------------------------------------
                                        Robert C. Mertensotto, Managing Director

<PAGE>

                                       WACHOVIA BANK, NATIONAL
                                       ASSOCIATION, as an Exiting Lender

                                       By: /s/ PHILIP TRINDER
                                           ------------------------------
                                           Philip Trinder, Vice President

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