Document:

Amendment No. 1 to Deferred Compensation Plan 2008 Restatement

 Exhibit 10.31 
 AMENDMENT NO. 1 
 TO 
 ELECTRO SCIENTIFIC INDUSTRIES, INC. 
 DEFERRED COMPENSATION PLAN

 2008 Restatement 
 January 1, 2008 
  

			
	 Electro Scientific Industries, Inc.
 an Oregon
Corporation
 13900 NW Science Park Drive
 Portland,
OR 97229
	  	Company

 The 2008 Restatement of the Electro Scientific Industries, Inc. Deferred Compensation Plan is
amended to provide for participation in the Plan by members of the Board of Directors of the Company, and to make clarifications and corrections to terms, as follows (new text is shown by underline and deleted text is shown by strikeout):

  

	 	A.	Eligibility 

 2.1 * * * 
 2.2 Members of the Board of Directors of the Company (“Board Members”) shall be eligible to participate in the Plan.

 2.23 “Participant” means a Board Member, an
Officer, or other eligible employee who has an account under the Plan or who has elected to defer compensation pursuant to Section 3 for any Plan Year. 
 2.34 Participation shall continue until the individual has been paid all amounts in accordance with the Plan. An
individual who ceases to be an Officer or Board Member, or an employee who the CEO or delegate determines is no longer eligible, shall continue to be a Participant, but shall not elect to defer additional amounts. Any election in
effect while the individual is eligible shall remain in effect with respect to the entire Plan Year or with respect to a Bonus, as applicable. 
  

 1 

	 	B.	Deferral Election 

 3.1 A Board Member
or Aan eligible employee may elect to participate for each Plan Year by completing a form prescribed by the Committee (a “Cash Deferral Election“), signing it and returning it to the Committee. The Cash Deferral
Election provides for a deferral of Compensation under 3.2. 
 3.2 “Compensation” means the following, without regard for
any deferral of compensation remuneration under the Plan: 
 (a) * * * 
 (b) * * * 
 (c) Directors’ fees (“Fees”) earned and payable in cash or in shares of stock of the Company (or both) within the Plan Year (except for usual administrative delay for payment in arrears). 
 3.3 A Cash Deferral Election shall specify the percentage of Salary, or Bonus, or
Fees to be deferred, subject to the following restrictions: 
 (a) * * * 
 (b) * * * 
 (c) A deferral of Fees shall be a minimum of 10 percent and a maximum of 100 percent, unless the Board Member defers none of the Fees. If Fees for a period are payable in cash and shares, the same percentage must apply to the cash
portion and to the share portion. 
 3.4 To be effective for a Plan Year, the Cash Deferral Election must be returned before a
date established by the Committee and the following apply: 
 (a) The date for submitting a Cash Deferral Election for Salary
or Fees shall be not later than the December 31 before the first day of the Plan Year, except as provided in (c). 
 (b) * * * 
 (c) An individual under 2.1 who first becomes an employee of an Employer during a Plan Year or an
individual under 2.2 who first becomes a Board Member during a Plan Year may elect to participate for the remainder of the Plan Year by completing, signing, and returning to the Committee a Cash Deferral Election within 30 days after becoming an
employee or a Board Member, and the following shall apply:. 
 (1) The Cash Deferral Election
shall apply to the Participant’s elected percentage of Salary for the Plan Year earned after the end of the pay period in which the Cash Deferral Election is received by the Committee. 
  

 2 

 (2) The Cash Deferral Election shall apply to the Participant’s elected
percentage of Fees for the Plan Year earned for service as a Board Member after the end of the quarter in which the Cash Deferral Election is received by the Committee. 
 (3) An individual who is a Participant or is eligible to defer Compensation or restricted stock units and then first becomes an
employee or a Board Member during a Plan Year may not elect to defer Compensation payable for services in the Plan Year with respect to the new status as an employee or new status as a Board Member. 
 (d) * * * 
 (e) * * * 
 * * * 
 3.6 A Board Member or Aan eligible employee may elect to participate with respect to restricted stock units granted in a Plan Year by completing a form prescribed by the Committee
(a “Stock Deferral Election”), signing it and returning it to the Committee. The Stock Deferral Election provides for the deferral of compensation under a restricted stock unit to a time later than the time the restricted stock unit vests
or is otherwise payable. 
 * * * 
 3.7 A “restricted stock unit” means a restricted stock unit granted under the Company’s 2004 Stock Option Incentive Plan, subject to the following: 
 (a) A restricted stock unit (“RSU”) that is payable in a share of Company common stock
(“Stock”), subject to vesting, is an “RSU.” 
 (b) * * * 
 3.9 * * * 
 (a) The
Stock Deferral Election shall be irrevocable, and the date for submitting a Stock Deferral Election, shall not be later than the December 31 before the first day of the Plan Year, except as provided in (b). 
 (b) An individual under 2.1 who first becomes an employee of an Employer during a Plan Year or an individual under 2.2 who first
becomes a Board Member during a Plan Year may elect to defer restricted stock units granted in the Plan Year by completing, signing and returning to the Committee a Stock Deferral Election within 30 days after becoming an employee or Board
Member, subject to (c) and the following: 
 (1) A Stock Deferral Election may not be returned on or after the
date that restricted stock units are granted to the participant eligible individual in the Plan Year. 
  

 3 

 (2) A Participant who could attain a retirement age that would accelerate the vesting
of an RSU or accelerate the determination of the multiplier or the delivery of shares under a PSRU is not eligible to elect deferral with respect to such restricted stock units under this provision, and any Stock Deferral Election returned shall be
ineffective with respect to such restricted stock units. 
 (c) An individual who is a Participant or is eligible to
defer Compensation or restricted stock units and then first becomes an employee or a Board Member during a Plan Year may not elect to defer restricted stock units awarded in the Plan Year with respect to the new status as an employee or new status
as a Board Member. 
 3.10 Employer shall reduce the Participant’s Salary and, Bonus and Fees
by the amounts deferred under a cash deferral election and shall credit such amount to the Participant’s Account under section 4. * * * 
 3.11 Employer shall credit the number of shares of Stock specified under the Stock Deferral Election to the Participant’s Account under section 4. Employer shall adjust the number of phantom shares that are subject to a
multiplier by application of the multiplier as provided in the related PSRU, except fractional shares remaining after aggregating the adjusted phantom shares shall be disregarded. The Participant shall not receive compensation with respect to RSUs
or PRSUs covered by Stock Deferral Elections for income tax purposes upon the vesting of an RSU or the determination or application of a multiplier for a PRSU. The value of the shares of Stock reflected as phantom shares shall be treated as wages
to Participants who are employees for purposes of FICA taxes as follows: 
 * * * 
  

	 	C.	Payment 

 6.1 Upon a Termination of the
Participant and as provided in 6.5, Ddeferred Salary and Bonus, and deferred Fees otherwise payable in cash, and related earnings credit based on the Participant’s Account shall be payable in
cash., and Upon a Termination of the Participant and as provided in 6.5, phantom shares of Stock shall be payable in whole shares of Stock. , upon a Termination of the Participant and as provided in 6.5
and Tthe following shall apply: * * * 
  

 4 

	 	D.	Unforeseeable Emergencies 

 8.2 * * *

 (c) Deferrals of Salary and Fees shall cease for the remainder of the Plan Year. 
  

	 	E.	Other Clarifications and Corrections 

 4.2
The account of each Participant shall be adjusted by adding credit for deferrals under section 3 and credit for additional phantom shares of the Stock after application of a multiplier as provided in 3.11. Deferred shares of Stock under
Section 3 shall be credited as whole phantom shares. Cash amounts shall be credited as soon as practicable after the date the amount would have been paid if not deferred. Deferred Sshares of
deferred Stock shall be credited as soon as practicable after receipt of a stock deferral election whether or not the number of shares is subject to later adjustment because of determination of a multiplier. * * * 

6.5 A Participant may elect with respect to deferrals of Compensation and shares of Stock under a restricted stock unit for any Plan
Year to have all amounts deferred for the Plan Year, plus related earnings credit, paid in a Plan Year specified by the Participant. A Participant may make a separate election with respect to a deferral of Stock. The following shall apply:

 * * * 
 6.6 Payment on
account of Termination, including Retirement, may not start or be made to a Participant who is a “key employee” as defined in Section 416(i) of the Code, without regard to Section 416(i)(5) of the Code. Disability shall not be a
Termination for purposes of this 6.6. The Committee may determine that a Participant is a key employee in the event of doubt or to avoid impractical efforts or expense to make an exact determination of key employees. A Participant shall have no
claim, rights or remedy if the determination is not correct. 
 (a) If the Participant terminates service because of death or
if the Participant dies before or within the six months, benefits shall be paid as soon as practicable after death, except as provided in 7.1(a). * * * 
 (b) * * * 
  

	 	F.	Effective Dates and Special Provisions 

 Amendment No. 1 is generally effective January 1, 2008, except for provisions relating to eligibility of directors to participate. 
  

 5 

 Directors become eligible to participate effective May 15, 2008. For purposes of restricted stock
units awarded to Board Members on or after May 15, 2008, individuals who are Board Members as of May 15, 2008 shall be treated under 3.9 of the Plan as first becoming a Board Member on May 15, 2008 and an election to defer the
restricted stock units may be returned after the award of the units. The requirement under 3.9(b) to return the election within 30 days shall apply. 
  

									
	Company	 		 	ELECTRO SCIENTIFIC INDUSTRIES, INC.
					
		 		 		 	By: 	 	 
				
		 		 		 	Executed:                     , 2008

  

 6Waiver and First Amendment to Credit Agreement

 Exhibit 10.1 
  
  
 WAIVER AND FIRST AMENDMENT 
 TO CREDIT AGREEMENT 
 among 
 GASTAR EXPLORATION USA, INC. 
 THE GUARANTORS
SIGNATORY HERETO 
 THE LENDERS SIGNATORY HERETO 
 and 
 AMEGY BANK NATIONAL ASSOCIATION, 
 as Administrative Agent 
 Effective April 1, 2008 
  
  

 Table of Contents 
  

					
	 Article I
	  	DEFINITIONS AND INTERPRETATION	  	1
			
	 1.1
	  	Terms Defined Above	  	1
	 1.2
	  	Terms Defined in Credit Agreement	  	2
	 1.3
	  	References	  	2
	 1.4
	  	Articles and Sections	  	2
	 1.5
	  	Number and Gender	  	2
			
	 Article II
	  	WAIVER	  	3
			
	 2.1
	  	Waiver	  	3
	 2.2
	  	Limitation on Waiver	  	3
			
	 Article III
	  	AMENDMENTS	  	3
			
	 3.1
	  	Amendment to Section 1.2	  	3
	 3.2
	  	Amendment to Section 5.8	  	3
	 3.3
	  	Amendment to Section 6.1	  	4
	 3.4
	  	Amendments to Section 7.1	  	4
	 3.5
	  	Amendment to Schedule 4.23	  	5
			
	 Article IV
	  	REPRESENTATIONS AND WARRANTIES	  	5
			
	 Article V
	  	RATIFICATION AND ACKNOWLEDGMENT	  	5
			
	 Article VI
	  	MISCELLANEOUS	  	5
			
	 6.1
	  	Successors and Assigns	  	5
	 6.2
	  	Rights of Third Parties	  	6
	 6.3
	  	Counterparts	  	6
	 6.4
	  	Integration	  	6
	 6.5
	  	Severability	  	6
	 6.6
	  	Governing Law	  	6

  

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 WAIVER AND FIRST AMENDMENT 
 TO CREDIT AGREEMENT 
 This WAIVER AND FIRST AMENDMENT TO CREDIT AGREEMENT (this
“Amendment”) executed effective as of April 1, 2008 (the “Effective Date”) is by and among GASTAR EXPLORATION USA, INC., a Michigan corporation (the “Borrower”), GASTAR EXPLORATION, LTD., an
Alberta, Canada corporation (the “Parent”), GASTAR EXPLORATION NEW SOUTH WALES, INC., a Michigan corporation (“Gastar New South Wales”), GASTAR EXPLORATION VICTORIA, INC., a Michigan corporation (“Gastar
Victoria”), GASTAR EXPLORATION TEXAS, INC., a Michigan corporation (“Gastar Texas Inc”), GASTAR EXPLORATION TEXAS, LP, a Delaware limited partnership (“Gastar Texas LP”), and GASTAR EXPLORATION TEXAS LLC, a
Delaware limited liability company (“Gastar Texas LLC”, and the Parent, Gastar New South Wales, Gastar Victoria, Gastar Texas Inc., Gastar Texas LP and Gastar Texas LLC, collectively, the “Initial Guarantors”), the
lenders party to that certain Credit Agreement dated effective November 29, 2007 by and among the Borrower, the Initial Guarantors, the lenders party thereto or bound thereby from time to time (the “Lenders”), and Amegy Bank
National Association, a national banking association, as administrative agent for the Lenders, letter of credit issuer and collateral agent for the Lenders and certain other parties (the “Credit Agreement”), and AMEGY BANK NATIONAL
ASSOCIATION, a national banking association, as administrative agent for the Lenders (in such capacity, the “Agent”). 
 W I T N E S S E T H: 
 WHEREAS, the Borrower, the Initial
Guarantors, the Lenders and the Agent are parties to the Credit Agreement; 
 WHEREAS, the Borrower and the Initial Guarantors have requested
that the Agent and the Lenders waive any default or right to exercise any remedy as a result of the federal taxpayer identification number of the Parent having been set forth incorrectly in Schedule 4.23 to the Credit Agreement, and the Agent and
the Lenders have agreed to do so as provided in this Amendment; and 
 WHEREAS, the Borrower, the Initial Guarantors, the Lenders and the
Agent desire to amend the Credit Agreement in the particulars hereinafter provided; 
 NOW, THEREFORE, in consideration of the premises and
the mutual covenants and agreements contained in the Credit Agreement and herein, the parties hereto agree as follows: 
 ARTICLE I

 DEFINITIONS AND INTERPRETATION 
 1.1 Terms Defined Above. As used in this Waiver and First Amendment to Credit Agreement, each of the terms “Agent,” “Amendment,” “Borrower,” “Credit Agreement,”
“Effective Date,” “Gastar New South Wales,” “Gastar Texas Inc,” “Gastar Texas LLC,” “Gastar Texas LP,” “Gastar Victoria,” “Initial
Guarantors,” “Lenders” and “Parent” shall have the meaning assigned to such term hereinabove. 

 1.2 Terms Defined in Credit Agreement. Each term defined in the Credit Agreement and used herein
without definition shall have the meaning assigned to such term in the Credit Agreement, unless herein expressly provided to the contrary. 
 1.3 References. References in this Amendment to Exhibit, Article or Section numbers shall be to Exhibits, Articles or Sections of this Amendment, unless expressly stated to the contrary. References in this Amendment to
“hereby,” “herein,” “hereinafter,” “hereinabove,” “hereinbelow,” “hereof,” “hereunder” and words of similar import shall be to this Amendment in its entirety and not only to the
particular Schedule, Exhibit, Article, or Section in which such reference appears. Specific enumeration herein shall not exclude the general and, in such regard, the terms “includes” and “including” used herein shall mean
“includes, without limitation,” or “including, without limitation,” as the case may be, where appropriate. Except as otherwise indicated, references in this Amendment to statutes, sections, or regulations are to be construed as
including all statutory or regulatory provisions consolidating, amending, replacing, succeeding, or supplementing the statute, section, or regulation referred to. References in this Amendment to “writing” include printing, typing,
lithography, facsimile reproduction, and other means of reproducing words in a tangible visible form. References in this Amendment to amendments and other contractual instruments shall be deemed to include all exhibits and appendices attached
thereto and all subsequent amendments and other modifications to such instruments, but only to the extent such amendments and other modifications are not prohibited by the terms of the Credit Agreement or this Amendment. References in this Amendment
to Persons include their respective successors and permitted assigns. 
 1.4 Articles and Sections. This Amendment, for convenience
only, has been divided into Articles and Sections; and it is understood that the rights and other legal relations of the parties hereto shall be determined from this instrument as an entirety and without regard to the aforesaid division into
Articles and Sections and without regard to headings prefixed to such Articles or Sections. 
 1.5 Number and Gender. Whenever the
context requires, reference herein made to the single number shall be understood to include the plural; and likewise, the plural shall be understood to include the singular. Definitions of terms defined in the singular or plural shall be equally
applicable to the plural or singular, as the case may be, unless otherwise indicated. Words denoting sex shall be construed to include the masculine, feminine and neuter, when such construction is appropriate; and specific enumeration shall not
exclude the general but shall be construed as cumulative. 
  

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 ARTICLE II 
 WAIVER 
 2.1 Waiver. The Agent and the Lenders waive any Default or Event of Default under the
Credit Agreement or any other Loan Document as a result of the federal taxpayer identification number of the Parent having been set forth incorrectly in Schedule 4.23 to the Credit Agreement, together with the right of the Lender to exercise any
remedy based thereon. 
 2.2 Limitation on Waiver. Except for the waiver set forth above in Schedule 2.1, nothing contained
herein shall otherwise be deemed a consent to any violation of, or a waiver of compliance with, any term, provision or condition set forth in any of the Loan Documents or a consent to or waiver of any other or future violations, breaches, Defaults
or Events of Default. 
 ARTICLE III  
 AMENDMENTS 
 Effective as of the Effective Date, the Borrower, the Initial Guarantors, the Lenders
and the Agent hereby amend the Credit Agreement in the following particulars: 
 3.1 Amendment to Section 1.2. Section 1.2
of the Credit Agreement is amended to add thereto, at the appropriate alphabetical location, the following definition: 
 “‘Projected Production’ shall mean, at any time, the volumes of proved developed producing and proved developed non-producing reserves of each commodity category reasonably projected by the Borrower, in the most recent
Reserve Report provided pursuant to the provisions of Section 5.4, but adjusted as to such production for the current and subsequent calendar years only, with the approval of the Agent based on information provided by the Borrower in
satisfaction of the requirements of Section 5.8, to account for any increase (other than with respect to reserves reflected in such Reserve Report as proved undeveloped) or decrease in such projection anticipated because of information
obtained by the Borrower subsequent to the publication of such Reserve Report (including the Borrower’s internal forecasts of production decline rates for existing wells and additions to or deletions from anticipated future production from
wells and acquisitions coming on stream or failing to come on stream), to be produced from the Oil and Gas Properties of the Borrower and the Guarantors during the terms of then existing Commodity Hedge Agreements to which the Borrower or any of the
Guarantors is a party.” 
 3.2 Amendment to Section 5.8. Section 5.8 of the Credit Agreement is amended to add thereto
the following immediately preceding the period at the end of such Section 5.8: 
 “and provide to the Agent, (a) no later than the 30th day following the end of each calendar month, a
report, in form reasonably acceptable to the Agent, reflecting (i) in the case of Oil and Gas Properties of the Borrower or any of the 

  

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Guarantors located in the State of Texas or, regardless of location, operated by the Borrower or any of the Guarantors, the volumes of hydrocarbons produced
from such Oil and Gas Properties during the calendar month preceding the calendar month in which such report is to be provided, (ii) in the case of Oil and Gas Properties of the Borrower or any of the Guarantors located in the State of Wyoming
or, regardless of location, not operated by the Borrower or any of the Guarantors, the volumes of hydrocarbons produced from such Oil and Gas Properties during the period covered by the information most recently received by the Borrower or the
relevant Guarantor from the operator or operators of such Oil and Gas Properties and (iii) the details of the notional amounts of hydrocarbons, as of the end of the calendar month preceding the calendar month in which such report is to be
provided, under then existing Commodity Hedge Agreements to which any of the Borrower and the Guarantors is a party and (b) prior to the Borrower or any Guarantor entering into any Commodity Hedge Agreement in reliance on adjustments to the
volumes of reserves projected to be produced in the most recent Reserve Report provided pursuant to the provisions of Section 5.4 contemplated in the definition of Projected Production appearing in Section 1.2, a statement of
the adjustments made and the basis therefor.” 
 3.3 Amendment to Section 6.1. Clause (c) in the proviso appearing in
Section 6.1 of the Credit Agreement is amended to read as follows in its entirety: 
 “(c) Indebtedness under
Commodity Hedge Agreements (other than those entered into on a speculative basis), including reimbursement obligations under letters of credit securing or supporting such Indebtedness, with any Approved Hedge Counterparty, Secured Third Party Hedge
Counterparty or, so long as each such Person is acceptable to the Agent, other counterparties, provided that (i) such agreements shall not be for a term in excess of three years, (ii) such agreements, to the extent constituting
floors, shall not be entered into with respect to more than eighty five percent (85%), in the aggregate, of the Projected Production not the subject of a Commodity Hedge Agreement which is the subject of the immediately following clause (iii);
provided that if the Available Commitment is at least equal to ten percent (10%) of the Commitment Amount, such agreements may cover greater volumes of reserves, (iii) such agreements, to the extent not constituting floors, shall
not be entered into with respect to more than eighty five percent (85%), in the aggregate, of the Projected Production not the subject of a Commodity Hedge Agreement which is the subject of the immediately preceding clause (ii) and
(iv) the floor prices in such agreements are not less than the prices used by the Agent in its most recent Borrowing Base determination as of the time the relevant agreements are entered into,”. 
  

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 3.4 Amendments to Section 7.1. Section 7.1 of the Credit Agreement is amended to
(a) delete “or” at the end of clause (m) of such Section 7.1, (b) revise clause (n) of such Section 7.1 to be clause (o) of such Section 7.1 and (c) add the following as clause (n) of such
Section 7.1: 
 “(n) as of the end of any calendar month during which the Borrower or any of the Guarantors had
Commodity Hedge Agreements (other than floors) in effect for volumes in excess of the volumes of reserves projected to be produced in the most recent Reserve Report provided pursuant to the provisions of Section 5.4, the notional amount
of hydrocarbon production for such calendar month under such Commodity Hedge Agreements exceeds actual production from the Oil and Gas Properties of the Borrower and the Guarantors for such calendar month; provided, however, that, for
the first 30 days only following any curtailment of production from any of the Oil and Gas Properties of the Borrower or any of the Guarantors due to any condition, event or occurrence downstream of a wellhead and not within the reasonable control
of the Borrower or the relevant Guarantor (including any matter with respect to third party pipelines or processing facilities), for purposes of this clause (n) each well so affected shall be deemed to have continued to produce during such 30
day period at the level at which it was producing immediately prior to the relevant curtailment; or”. 
 3.5 Amendment to Schedule
4.23. Schedule 4.23 to the Credit Agreement is amended to reflect the federal taxpayer identification number for the Parent to be 98-0570897. 
 ARTICLE IV  
 REPRESENTATIONS AND WARRANTIES 
 Each of the Borrower and the Initial Guarantors expressly re-makes, in favor of the Agent and the Lenders, each of the representations and warranties set
forth in Article IV of the Credit Agreement and in the other Loan Documents and made by it and represents and warrants that all such representations and warranties remain true and correct. 
 ARTICLE V 
 RATIFICATION AND ACKNOWLEDGMENT 
 Each of the Borrower, the Initial Guarantors, the Lenders and the Agent does hereby adopt, ratify and confirm the Credit Agreement, as amended hereby,
and each of the other Loan Documents to which it is a party and acknowledges and agrees that the Credit Agreement, as amended hereby, and each of the other Loan Documents to which it is a party is and remains in full force and effect. 
 ARTICLE VI  
 MISCELLANEOUS

 6.1 Successors and Assigns. This Amendment shall be binding upon and inure to the benefit of the parties hereto and their
respective successors and assigns permitted pursuant to the Credit Agreement. 
  

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 6.2 Rights of Third Parties. Except as provided in Section 6.1, all provisions herein
are imposed solely and exclusively for the benefit of the parties hereto. 
 6.3 Counterparts. This 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 and shall be enforceable as of the Effective Date upon the execution of one
or more counterparts hereof by each of the parties hereto. In this regard, each of the parties hereto acknowledges that a counterpart of this Amendment containing a set of counterpart execution pages reflecting the execution of each party hereto
shall be sufficient to reflect the execution of this Amendment by each necessary party hereto and shall constitute one instrument. 
 6.4
Integration. This Amendment constitutes the entire agreement among the parties hereto with respect to the subject hereof. All prior understandings, statements and agreements, whether written or oral, relating to the subject hereof are
superseded by this Amendment. 
 6.5 Severability. In the event that any one or more of the provisions contained in this Amendment
shall for any reason be held invalid, illegal or unenforceable in any respect, such invalidity, illegality or unenforceability shall not affect any other provision of this Amendment. 
 6.6 Governing Law. THIS AMENDMENT SHALL BE DEEMED TO
BE A CONTRACT MADE UNDER AND SHALL BE GOVERNED BY AND CONSTRUED
IN ACCORDANCE WITH THE LAWS OF THE STATE OF TEXAS, WITHOUT REGARD
TO PRINCIPLES OF SUCH LAWS RELATING TO CONFLICTS OF LAW. 
 (Signatures appear on following pages) 
  

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 IN WITNESS WHEREOF, the parties hereto have caused this Waiver and First Amendment to Credit Agreement to
be duly executed and delivered, as of the Effective Date, by their proper and duly authorized officers. 
  

			
	BORROWER:
	
	GASTAR EXPLORATION USA, INC.
		
	By:	 	 /s/ MICHAEL A. GERLICH

		 	Michael A. Gerlich
		 	Secretary and Treasurer
	
	INITIAL GUARANTORS:
	
	GASTAR EXPLORATION LTD.
		
	By:	 	 /s/ MICHAEL A. GERLICH

		 	Michael A. Gerlich
		 	Vice President and Chief Financial Officer

 (Signatures continue on following pages) 
  

 - 7 - 

			
	GASTAR EXPLORATION NEW SOUTH WALES, INC.
		
	By:	 	 /s/ MICHAEL A. GERLICH

		 	Michael A. Gerlich
		 	Secretary and Treasurer
	
	GASTAR EXPLORATION VICTORIA, INC.
		
	By:	 	 /s/ MICHAEL A. GERLICH

		 	Michael A. Gerlich
		 	Secretary and Treasurer
	
	GASTAR EXPLORATION TEXAS, INC.
		
	By:	 	 /s/ MICHAEL A. GERLICH

		 	Michael A. Gerlich
		 	Secretary and Treasurer
	
	GASTAR EXPLORATION TEXAS, LP
		
	By:	 	 Gastar Exploration Texas LLC,
 its General Partner

		
	By:	 	 /s/ MICHAEL A. GERLICH

		 	Michael A. Gerlich
		 	Secretary and Treasurer

 (Signatures continue on following pages) 
  

 - 8 - 

			
	GASTAR EXPLORATION TEXAS LLC
		
	By:	 	 /s/ MICHAEL A. GERLICH

		 	Michael A. Gerlich
		 	Secretary and Treasurer

 (Signatures continue on following page) 
  

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	AGENT:
	
	AMEGY BANK NATIONAL ASSOCIATION, as Agent
		
	By:	 	 /s/ W. BRYAN CHAPMAN

		 	W. Bryan Chapman
		 	Senior Vice President
	
	LENDER:
	
	AMEGY BANK NATIONAL ASSOCIATION
		
	By:	 	 /s/ W. BRYAN CHAPMAN

		 	W. Bryan Chapman
		 	Senior Vice President

  

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