AMENDMENT TO PURCHASE AND SALE AGREEMENT

Amendment: The Parties hereby amend the PSA as follows:

In Section 1.1 of the PSA, subpart (a) of the definition of Properties is hereby amended by deleting the entire subpart (a) of such definition and replacing it with the following language:

In Section 1.1 of the PSA, subpart (e) of the definition of Properties is hereby amended by deleting the entire subpart (e) of such definition and replacing it with the following language:

Exhibit “B” of the PSA is hereby deleted in its entirety and Exhibit A attached hereto is substituted in lieu thereof for all purposes;

The PSA is hereby amended by adding a new Section 5.12 to the PSA, as follows:

Withdrawal of ARLLC and JRLLC from PSA.  ARLP and JRLLC (the “Withdrawing Parties”), on the one hand, and the Buyer, on the other hand, hereby acknowledge and agree that the interests in the Properties owned by the Withdrawing Parties (the “Withdrawn Interests”) are hereby withdrawn from the purchase and sale transactions under to the PSA.  The Buyer hereby releases the Withdrawing Parties from the obligation to sell the Withdrawn Interests to the Buyer and from all other obligations of the Withdrawing Parties under the PSA and any other documents or contracts executed in connection therewith, and each of the Withdrawing Parties hereby releases the Buyer from the obligation to purchase the Withdrawn Interests and from all other obligations owed to the Withdrawing Parties under the PSA and any other documents or contracts executed in connection therewith.  The unadjusted Purchase Price is hereby reduced by the aggregate Allocated Value of the Withdrawn Interests as set forth on Exhibit “A” to the PSA, and at Closing the Withdrawing Parties’ pro rata portion of the Deposit shall be applied against the remaining Purchase Price. The Withdrawing Parties, the Buyer, CELLC and LRLLC each acknowledge and agree that all references herein and in the PSA (a) to “Sellers” are deemed amended to refer solely to CELLC and LRLLC as the Sellers, (b) to “Party” and “Parties” are deemed amended to refer solely to, individually and collectively, CELLC, LRLLC and the Buyer, and (c) to “Properties” are deemed amended to refer solely to CELLC’s Properties and LRLLC’s Properties.

FWPP Obligations. For clarity, the Chesapeake Energy Corporation ("CHK") Founder Well Participation Program as well as any and all rights and obligations thereunder or under any prior employment agreements between CHK and Aubrey K. McClendon are Excluded Assets and Retained Liabilities of CHK, and do not constitute Assumed Obligations of the Buyer or comprise any part of the Properties.

Additional Further Assurances. The Parties agree that after the Closing, promptly following Gastar's written notification, the Parties will duly execute such appropriate state, federal, or Indian conveyances to the extent necessary to complete the conveyance of the Properties to the Buyer.

Confirmation. Except as otherwise provided herein, the provisions of the PSA shall remain in full force and effect in accordance with their respective terms following the execution of this Amendment.

Counterparts; Facsimiles, Electronic Transmission. This Amendment may be executed in multiple counterparts, each of which will be an original instrument, but all of which will constitute one agreement. The execution and delivery of this Amendment by any Party may be evidenced by facsimile or scanned email, which shall be binding upon all Parties.

Entire Agreement. This Amendment, the PSA, and those documents expressly referred to herein and therein, and the other documents executed in connection herewith embody the complete agreement and understanding among the Parties and supersede and preempt any prior understandings, agreements or representations by or among the Parties, written or oral, which may have related to the subject matter hereof in any way. There are no oral agreements between the Parties.

Miscellaneous: Capitalized terms used, but not defined herein, shall have the meanings given to those terms in the PSA. As amended above, the PSA shall continue in full force and effect.