EXHIBIT 4.6.2 UNION BANK OF CALIFORNIA, N.A. 4200 LINCOLN PLAZA 500 NORTH AKARD DALLAS, TEXAS 75201 October 5, 2001 Chesapeake Energy Corporation Chesapeake Exploration Limited Partnership 6100 North Western Avenue Oklahoma City, Oklahoma 73118 Re: Second Amended and Restated Credit Agreement dated as of June 11, 2001 (as amended, supplemented or restated, the "Credit Agreement"), by and among Chesapeake Exploration Limited Partnership, an Oklahoma limited partnership ("Borrower"), Chesapeake Energy Corporation, an Oklahoma corporation ("Company"), Bear Stearns Corporate Lending Inc., as syndication agent ("Syndication Agent"), Union Bank of California, N.A., as administrative agent and collateral agent ("Administrative Agent"), and the several banks and other financial institutions or entities from time to time parties thereto ("Lenders") Ladies and Gentlemen: Reference is hereby made to the Credit Agreement. Terms which are defined in the Credit Agreement and not otherwise defined herein are used herein with the meanings given them in the Credit Agreement. By letter dated September 10, 2001, Administrative Agent and Lenders consented to the sale by Company of all of the outstanding capital stock of Chesapeake Canada Corporation to a Person that is not an Affiliate of Company for a sales price of approximately C $232,000,000 (the "Canadian Sale") pursuant to the terms and conditions set forth therein. Upon consummation of the Canadian Sale, Borrower and Company have requested that Administrative Agent and Lenders consent (a) to the purchase, redemption, or other acquisition by Company of shares of its common stock (the "Common Stock"), from the holders thereof (to the extent entered into after the date hereof, the "Stock Repurchases"), and (b) to the sale by Company of put options or other derivatives relating to its Common Stock ("Option Contracts") whereby Company would become obligated to purchase shares of Common Stock from the holder thereof (to the extent entered into after the date hereof, the "Derivative Sales"). Subject to the terms and provisions hereof, Administrative Agent and Lenders hereby (a) consent to the Stock Repurchases and the Derivative Sales, (b) waive any violations of the Credit Agreement resulting therefrom, and (c) agree that such Stock Repurchases and Derivative Sales shall be permitted in addition to the Restricted Payments otherwise permitted pursuant to Section 7.6 of the Credit Agreement; provided that: (i) at the time of each Stock Repurchase and each Derivative Sale, no Default or Event of Default has occurred which is continuing, (ii) the Stock Repurchases and the Derivative Sales shall be approved by the Board of Directors of Company, (iii) without duplication, the aggregate amount paid by Company for all Stock Repurchases or paid in connection with any Option Contract (including, but not limited to, amounts paid upon an exercise by the holder thereof and amounts paid to close out an Option Contract prior to its expiration), plus the maximum amounts which Company might be called upon to pay under or in connection with all Option Contracts then outstanding, minus the aggregate amount of cash consideration received by Company for entering into Derivative Sales shall not exceed the amount of $50,000,000 at any time, (iv) no Stock Repurchases may occur after June 30, 2002 and all obligations of Company to purchase shares of Common Stock under Option Contracts must expire on or prior to June 30, 2002, (v) the Canadian Sale shall have been consummated prior to the commencement of such Stock Repurchases and Derivative Sales, (vi) each Stock Repurchase shall be made in compliance with Regulation U promulgated by the Board of Governors of the Federal Reserve System, and (vii) nothing in this Letter Agreement shall allow any Person to make any other new Restricted Payments not allowed pursuant to Section 7.6 of the Credit Agreement. In consideration of this Letter Agreement, provided that Majority Lenders are signatory to this Letter Agreement on or before 2:00 p.m., Dallas, Texas time on the date hereof, Borrower will pay to Administrative Agent, for the account of the Lenders signatory to this Letter Agreement on or before such time, an amendment fee determined by multiplying .05% times such Lender's Revolving Commitment, which shall be due and payable on the date hereof. The Credit Agreement is hereby ratified and confirmed in all respects. Except as expressly set forth above, the execution, delivery and effectiveness of this Letter Agreement shall not operate as a waiver of any right, power or remedy of Administrative Agent or Lenders under the Credit Agreement, the Notes, or any other Loan Document, nor constitute a waiver of any provision of the Credit Agreement, the Notes, or any other Loan Document. By its execution below, each Guarantor hereby (i) consents to the provisions of this Letter Agreement and the transactions contemplated herein, (ii) ratifies and confirms the Guarantee Agreement dated as of June 11, 2001 made by it for the benefit of Administrative Agent and Lenders and the other Loan Documents executed pursuant to the Credit Agreement, (iii) agrees that all of its respective obligations and covenants thereunder shall remain unimpaired by the execution and delivery of this Letter Agreement and the other documents and instruments executed in connection herewith, and (iv) agrees that the Guarantee Agreement and such other Loan Documents shall remain in full force and effect. This Letter Agreement is a "Loan Document" as defined and described in the Credit Agreement and all of the terms and provisions of the Credit Agreement relating to Loan Documents shall apply hereto. This Letter Agreement may be executed in multiple counterparts, all of which shall constitute one Letter Agreement. This Letter Agreement may be validly executed by facsimile or other electronic transmission. [THE REMAINDER OF THIS PAGE IS INTENTIONALLY LEFT BLANK.] Please execute a copy of this Letter Agreement in the space provided below to evidence your agreement to and acknowledgment of the foregoing. Very truly yours, UNION BANK OF CALIFORNIA, N.A. Administrative Agent, Collateral Agent and Lender By: /s/ RANDALL OSTERBERG -------------------------------------- Name: Randall Osterberg Title: Senior Vice President By: /s/ SEAN MURPHY -------------------------------------- Name: Sean Murphy Title: Assistant Vice President ACKNOWLEDGED AND AGREED to as of the date first written above: BORROWER: CHESAPEAKE EXPLORATION LIMITED PARTNERSHIP By: Chesapeake Operating, Inc., its general partner By: /s/ MARTHA A. BURGER -------------------------------------- Name: Martha A. Burger Title: Treasurer GUARANTORS: CHESAPEAKE ENERGY CORPORATION By: /s/ MARTHA A. BURGER -------------------------------------- Name: Martha A. Burger Title: Treasurer THE AMES COMPANY, INC. By: /s/ MARTHA A. BURGER -------------------------------------- Name: Martha A. Burger Title: Treasurer ARKOMA PITTSBURG HOLDING CORPORATION By: /s/ MARTHA A. BURGER -------------------------------------- Name: Martha A. Burger Title: Treasurer CHESAPEAKE ACQUISITION CORPORATION By: /s/ MARTHA A. BURGER -------------------------------------- Name: Martha A. Burger Title: Treasurer CHESAPEAKE ENERGY LOUISIANA CORPORATION By: /s/ MARTHA A. BURGER -------------------------------------- Name: Martha A. Burger Title: Treasurer CHESAPEAKE OPERATING, INC. By: /s/ MARTHA A. BURGER -------------------------------------- Name: Martha A. Burger Title: Treasurer CHESAPEAKE OPERATING, INC., as General Partner of Chesapeake Panhandle Limited Partnership By: /s/ MARTHA A. BURGER -------------------------------------- Name: Martha A. Burger Title: Treasurer CHESAPEAKE ROYALTY COMPANY By: /s/ MARTHA A. BURGER -------------------------------------- Name: Martha A. Burger Title: Treasurer CHESAPEAKE OPERATING, INC., as General Partner of Chesapeake-Staghorn Acquisition L.P. By: /s/ MARTHA A. BURGER -------------------------------------- Name: Martha A. Burger Title: Treasurer CHESAPEAKE OPERATING, INC., as General Partner of Chesapeake Louisiana, L.P. By: /s/ MARTHA A. BURGER -------------------------------------- Name: Martha A. Burger Title: Treasurer CHESAPEAKE OPERATING, INC., as General Partner of Chesapeake Exploration Limited Partnership By: /s/ MARTHA A. BURGER -------------------------------------- Name: Martha A. Burger Title: Treasurer GOTHIC ENERGY CORPORATION By: /s/ MARTHA A. BURGER -------------------------------------- Name: Martha A. Burger Title: Treasurer GOTHIC PRODUCTION CORPORATION By: /s/ MARTHA A. BURGER -------------------------------------- Name: Martha A. Burger Title: Treasurer NOMAC DRILLING CORPORATION By: /s/ MARTHA A. BURGER -------------------------------------- Name: Martha A. Burger Title: Treasurer LENDERS: BANK OF OKLAHOMA, N.A. By: /s/ JOHN N. HUFF -------------------------------------- Name: JOHN N. HUFF Title: Vice President BANK OF SCOTLAND By: /s/ JOSEPH FRATUS -------------------------------------- Name: Joseph Fratus Title: Vice President BEAR STEARNS CORPORATE LENDING INC. By: /s/ KEITH C. BARNISH -------------------------------------- Name: KEITH C. BARNISH Title: Senior Vice President BNP PARIBAS By: /s/ BRIAN M. MALONE -------------------------------------- Name: Brian M. Malone Title: Managing Director COMERICA BANK - TEXAS By: /s/ PETER L. SEFZIK -------------------------------------- Name: Peter L. Sefzik Title: Corporate Banking Officer COMPASS BANK By: /s/ KATHLEEN J. BOWEN -------------------------------------- Name: Kathleen J. Bowen Title: Vice President CREDIT AGRICOLE INDOSUEZ By: /s/ MICHAEL R. QUIRAY -------------------------------------- Name: Michael R. Quiray Title: VP, Sr. Manager By: /s/ MICHAEL D. WILLIS -------------------------------------- Name: Michael D. Willis Title: VP, Credit Analysis NATEXIS BANQUES POPULAIRES By: /s/ RENAUD J. D'HERBES By: /s/ DONOVAN C. BROUSSARD ------------------------------- ------------------------------------- Name: Renaud J. d'Herbes Name: Donovan C. Broussard Title: Senior Vice President Title: Vice President and Regional Manager NATIONAL BANK OF CANADA, NEW YORK BRANCH By: /s/ RANDALL K. WILHOIT -------------------------------------- Name: Randall K. Wilhoit Title: Vice President By: /s/ DOUG CLARK -------------------------------------- Name: Doug Clark Title: Vice President RZB FINANCE LLC By: /s/ F. DEITER BEINTREXLER -------------------------------------- Name: F. Deiter Beintrexler Title: President By: /s/ JOHN A. VALISKA -------------------------------------- Name: John A. Valiska Title: Vice President SUMITOMO MITSUI BANKING CORPORATION By: -------------------------------------- Name: Title: TORONTO DOMINION (TEXAS), INC. By: /s/ JIM BRIDWELL -------------------------------------- Name: Jim Bridwell Title: Vice President U.S. BANK NATIONAL ASSOCIATION By: /s/ M. WARD POLZIN -------------------------------------- Name: M. WARD POLZIN Title: Vice President WASHINGTON MUTUAL BANK, FA By: /s/ MARK M. ISENSEE -------------------------------------- Name: Mark M. Isensee Title: Manager CREDIT LYONNAIS NEW YORK BRANCH By: /s/ BERNARD WEYMULLER -------------------------------------- Name: Bernard Weymuller Title: Senior Vice President