Document:

EX-10.6

 Exhibit 10.6 
 SECOND AMENDMENT TO FORBEARANCE AGREEMENT AND FOURTH 
 AMENDMENT TO
AMENDED AND RESTATED CREDIT AGREEMENT 
 This SECOND AMENDMENT TO FORBEARANCE AGREEMENT AND FOURTH AMENDMENT TO AMENDED AND
RESTATED CREDIT AGREEMENT (this “Agreement”) is entered into as of December 23, 2011, by and among AQUILEX HOLDINGS LLC, a Delaware limited liability company (the “Borrower”), each other Loan Party listed on
the signature pages hereto, the Lenders listed on the signature pages hereto and ROYAL BANK OF CANADA, as Administrative Agent and Collateral Agent (in such capacities, the “Agent”), and as L/C Issuer (in such capacity, the
“L/C Issuer”). 
 RECITALS 

WHEREAS, the Borrower, the other Loan Parties, the Agent, the L/C Issuer and the Lenders are parties to that certain Amended and
Restated Credit Agreement, dated as of April 1, 2010 (as amended, restated, supplemented or otherwise modified from time to time prior to the date hereof, the “Credit Agreement”; capitalized terms used herein and not otherwise
defined shall have the meanings ascribed thereto in the Credit Agreement), pursuant to which, among other things, the Agent, the L/C Issuer and the Lenders named therein agreed, subject to the terms and conditions set forth in the Credit
Agreement, to make senior secured credit facilities and certain other financial accommodations available to the Borrower; 

WHEREAS, as of October 13, 2011, the Borrower, the other Loan Parties, the Agent, the L/C Issuer and the Lenders signatory
thereto entered into a Forbearance Agreement and Second Amendment to Amended and Restated Credit Agreement (as amended from time to time prior to the date hereof, the “Forbearance Agreement”) pursuant to which (including subsequent
amendments), among other things, the Agent and the Required Lenders, on behalf of all Lenders, agreed to forbear through February 3, 2012 from exercising remedies with respect to the Specified Defaults as set forth therein, and the Borrower and
the other Loan Parties agreed to either (a) consummate an out-of-court restructuring or (b) commence voluntary cases under Chapter 11 of Title 11 of the United States Code, in each case on or before January 27, 2012; 

WHEREAS, the Borrower, the other Loan Parties, the Agent, the holders of at least two-thirds in amount of the outstanding Loans, the
Second Lien Agent, the holders of at least two-thirds in amount of the Second Lien Term Loans, the beneficial holders or investment advisors or managers for the account of the holders of at least two-thirds in principal amount of the Senior Notes,
certain holders of Senior Notes, as equity backstop parties, and the Sponsor are, concurrently with the effectiveness hereof, entering into a Restructuring Support Agreement, pursuant to which the debt obligations of the Borrower shall be
restructured through either an out-of-court restructuring or commencement of pre-packaged bankruptcy cases (the “Restructuring Support Agreement”); and 
 WHEREAS, the Borrower has requested that the Credit Agreement, the Forbearance Agreement and the Second Lien Intercreditor Agreement be amended to reflect the agreements of the parties in the
Restructuring Support Agreement; 

  
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 NOW, THEREFORE, in consideration of the foregoing, the terms, covenants and conditions
contained herein and other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto agree as follows: 
  

	SECTION 1	Amendments to Credit Agreement. 

 (a) Section 2.08(c) of the Credit Agreement is hereby amended to add the following sentence at the end thereof: “For the avoidance of doubt, if the Forbearance Period terminates by reason of an
out-of-court restructuring, then the interest accrued or previously capitalized pursuant to the 1.00% increase in the Applicable Rate effected by the Forbearance Agreement shall be payable in cash on the effective date of such out-of-court
restructuring.” 
 (b) Section 11.21 of the Credit Agreement is hereby amended (i) to delete
Section 11.21(a) and (ii) to replace the number “$40,000,000” in clause 11.21(b) thereof with the number “$50,000,000”. 
  

	SECTION 2	Additional Amendments and Agreements. 

 (a) Amendment to Second Lien Intercreditor Agreement. The Administrative Agent is hereby authorized and directed to execute and deliver an amendment to the Second Lien Intercreditor Agreement in
the form attached hereto as Exhibit A. 
 (b) Amendment to Bondholder Letter Agreement. The Administrative Agent is
hereby authorized and directed to execute and deliver an amendment to the Bondholder Letter Agreement in the form attached hereto as Exhibit B. 
 (c) Amendment to Forbearance Agreement. Section 3(a) of the Forbearance Agreement is hereby amended to insert the following proviso at the end of clause (ii) thereof:
“provided, that if the deadline for consummating an out-of-court restructuring or, alternatively, commencing voluntary cases under Chapter 11 of Title 11 of the United States Code, has been extended pursuant to the terms of the
Restructuring Support Agreement, the Forbearance Period shall end on the earlier to occur of (i) and Forbearance Default and (ii) such extended date”. In addition, for the avoidance of doubt, the agreements of the Loan Parties set
forth in Section 4(a)(i) of the Third Amendment are superseded by the provisions of the Restructuring Support Agreement and if the date for commencing an out-of-court restructuring or commencing a voluntary case under Chapter 11 of Title 11 of
the United States Code is extended pursuant to the terms of the Restructuring Support Agreement to a later date, then the date set forth in Section 4(a)(i) shall be deemed extended to such date. 

 

	SECTION 3	Representations, Warranties and Covenants of Borrower and Each Other Loan Party. 

To induce the Agent, the L/C Issuer and the Lenders to execute and deliver this Agreement, the Borrower and each other Loan Party
represents, warrants and covenants that: 
 (a) the individual executing this Agreement on behalf of the Borrower and each other
Loan Party is authorized to so act and the execution of this Agreement by such individual makes the obligations set forth herein legal, valid, binding and enforceable against the 

  
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Borrower or such other Loan Party in accordance with their respective terms, except as the enforcement thereof may be subject to (i) the effect of any applicable bankruptcy, insolvency,
reorganization, moratorium or similar law affecting creditors’ rights generally and (ii) general principles of equity (regardless of whether such enforcement is sought in a proceeding in equity or at law); 

(b) except with respect to the Specified Defaults, each of the representations and warranties contained in the Credit Agreement and the
other Loan Documents (other than the representations and warranties in Section 5.05(b) and Section 5.17 of the Credit Agreement), as updated from time to time pursuant to the Perfection Certificates delivered to the Agent under the Credit
Agreement, is true and correct in all material respects on and as of the date hereof as if made on the date hereof, except to the extent that such representations and warranties expressly relate to an earlier date, in which case such representations
and warranties shall be true and correct in all material respects as of such earlier date, and each of the agreements and covenants in the Credit Agreement and the other Loan Documents is hereby reaffirmed with the same force and effect as if each
were separately stated herein and made as of the date hereof; 
 (c) neither the execution, delivery and performance of this
Agreement nor the consummation of the transactions contemplated hereby does or shall contravene, result in a breach of, or violate (i) any provision of the Borrower’s or any other Loan Party’s corporate charter, bylaws, operating
agreement, or other governing documents, (ii) any material Laws or (iii) any indenture, mortgage, deed of trust, lease, agreement or other instrument to which the Borrower or any other Loan Party is a party or by which the Borrower or any
other Loan Party or any of their respective property is bound except with respect to this clause (iii) to the extent such contravention, breach or violation would not reasonably be expected to have a Material Adverse Effect; 

(d) as of the date hereof, except for the Specified Defaults, no Event of Default has occurred and is continuing under this Agreement,
the Credit Agreement or any other Loan Document; and 
 (e) the Secured Parties’ security interest in the Collateral
continues to be valid, binding, and enforceable first-priority security interests that secures the Obligations (subject, with respect to priority only, to Liens permitted by Section 7.01 of the Credit Agreement). 

 

	SECTION 4	Ratification of Liability. 

 The Borrower and each other Loan Party hereby (a) ratifies and reaffirms all of its payment and performance obligations and obligations to indemnify, contingent or otherwise, under this Agreement,
the Credit Agreement, the Forbearance Agreement, the Third Amendment and each other Loan Document to which such Loan Party is a party, and each such Loan Party hereby ratifies and reaffirms its grant of Liens on or security interests in its
properties pursuant to such Loan Documents to which it is a party as security for the Obligations under or with respect to the Credit Agreement, and confirms and agrees that such Liens and security interests hereafter secure all of the Obligations.
The Borrower and each other Loan Party acknowledges receipt of a copy of this Agreement and all other agreements or documents executed or delivered in 

  
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connection herewith, (b) consents to the terms and conditions of same and (c) agrees and acknowledges that each of the Loan Documents remains in full force and effect and is hereby
ratified and confirmed. 
  

	SECTION 5	Reference to and Effect upon the Credit Agreement. 

 (a) Except as expressly modified hereby, all terms, conditions, covenants, representations and warranties contained in the Credit Agreement, the Forbearance Agreement, the Third Amendment and the other
Loan Documents, all rights of the Secured Parties and all of the Obligations shall remain in full force and effect. Each of the Borrower and each other Loan Party hereby confirms that no such party has any right of setoff, recoupment or other offset
or any defense, claim or counterclaim with respect to any of the Obligations, the Credit Agreement, the Forbearance Agreement, the Third Amendment or any other Loan Document. 
 (b) Except as expressly set forth herein or in the Forbearance Agreement, the effectiveness of this Agreement shall not directly or indirectly (i) create any obligation to make any further Loans,
Letters of Credit or financial accommodations under the Credit Agreement or to continue to defer any enforcement action after the occurrence of any Default or Event of Default (including, without limitation, any Forbearance Default),
(ii) constitute a consent or waiver of any past, present or future violations of any provisions of the Credit Agreement, the Forbearance Agreement, the Third Amendment or any other Loan Documents, (iii) amend, modify or operate as a waiver
of any provision of the Credit Agreement, the Forbearance Agreement, the Third Amendment or any other Loan Documents or any right, power or remedy of the Agent, the L/C Issuer or any Lender, (iv) constitute a consent to any merger or other
transaction or to any sale, restructuring or refinancing transaction or plan of reorganization, or (v) constitute a course of dealing or other basis for altering any Obligations or any other contract or instrument. Except as expressly set forth
herein, the Agent, the L/C Issuer and the Lenders reserve all rights, powers, and remedies under the Credit Agreement, the Forbearance Agreement, the Third Amendment, the other Loan Documents and applicable law. 

(c) From and after the Amendment Effective Date, (i) the term “Agreement” in the Credit Agreement, and all references to
the Credit Agreement in any Loan Document shall mean the Credit Agreement, as amended hereby, (ii) the term “Agreement” in the Forbearance Agreement, and all references to the Forbearance Agreement in any Loan Document shall mean the
Forbearance Agreement as amended hereby and (iii) the term “Loan Documents” in the Credit Agreement and the other Loan Documents shall include, without limitation, this Agreement and any agreements, instruments and other documents
executed and/or delivered in connection herewith. 
 (d) This Agreement shall not be deemed or construed to be a satisfaction,
reinstatement, novation or release of the Credit Agreement or any other Loan Document. 
  

	SECTION 6	Construction. 

This Agreement and all other agreements and documents executed or delivered in connection herewith have been prepared through the joint
efforts of all of the parties hereto. Neither the provisions of this Agreement or any such other agreements and documents nor any 

  
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alleged ambiguity therein shall be interpreted or resolved against any party on the ground that such party or its counsel drafted this Agreement or such other agreements and documents, or based
on any other rule of strict construction. Each of the parties hereto represents and declares that such party has carefully read this Agreement and all other agreements and documents executed or delivered in connection herewith, and that such party
knows the contents hereof and signs the same freely and voluntarily. The parties hereto acknowledge that they have been represented by legal counsel of their own choosing in negotiations for and preparation of this Agreement and all other agreements
and documents executed or delivered in connection herewith and that each of them has read the same and had their contents fully explained by such counsel and is fully aware of their respective contents and legal effect. 

 

	SECTION 7	Counterparts. 

This Agreement may be executed in any number of counterparts, each of which when so executed shall be deemed an original, but all such
counterparts shall constitute one and the same instrument, and all signatures need not appear on any one counterpart. Any party hereto may execute and deliver a counterpart of this Agreement by delivering by facsimile or other electronic
transmission (including .pdf or .tif) a signature page of this Agreement signed by such party, and any such facsimile or other electronic signature shall be treated in all respects as having the same effect as an original signature. 

 

	SECTION 8	Severability. 

 The
invalidity, illegality, or unenforceability of any provision in or obligation under this Agreement in any jurisdiction shall not affect or impair the validity, legality, or enforceability of the remaining provisions or obligations under this
Agreement or of such provision or obligation in any other jurisdiction. 
  

	SECTION 9	Further Assurances. 

The Borrower and each other Loan Party agrees to, and to cause any other Loan Party to, take all further actions and execute all further
documents as the Agent may from time to time reasonably request to carry out the transactions contemplated by this Agreement and all other agreements executed or delivered in connection herewith. 

 

	SECTION 10	Section Headings. 

Section headings in this Agreement are included herein for convenience of reference only and shall not constitute part of this Agreement
for any other purpose. 
  

	SECTION 11	Notices. 

 All
notices, requests, and demands to or upon the respective parties hereto shall be given in accordance with the Credit Agreement. 

  
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	SECTION 12	Effectiveness. 

This Agreement shall become effective at the time (the “Amendment Effective Date”) that all of the following conditions
precedent have been met (or waived) as determined by the Agent in its sole discretion: 
 (a) Agreement. The Agent shall
have received duly executed signature pages for this Agreement signed by the Agent, the L/C Issuer, the Required Lenders, the Borrower and each other Loan Party. 
 (b) Amendment to Second Lien Intercreditor Agreement. The Agent shall have received duly executed signature pages for an amendment to the Second Lien Intercreditor Agreement in the form attached
hereto as Exhibit A. 
 (c) Restructuring Support Agreement. The Restructuring Support Agreement shall have become
effective pursuant to its terms and the Agent shall have received a fully-executed copy thereof. 
 (d) Consent of Second
Lien Lenders. The requisite Second Lien Lenders shall have consented to the amendments set forth in Section 1 hereof. 

(e) Documentation. The Borrower and the other Loan Parties shall have delivered to the Agent such additional customary documents
and instruments as the Agent may require, all of the foregoing of which shall be in form and substance acceptable to the Agent. 

(f) Expenses. The Borrower shall have reimbursed all reasonable invoiced fees and expenses of the Agent’s financial advisor,
Zolfo Cooper, LLC, and counsel, Latham & Watkins LLP (including out-of-pocket expenses). 
  

	SECTION 13	Assignments; No Third Party Beneficiaries. 

 This Agreement shall be binding upon and inure to the benefit of the Borrower, each other Loan Party, the Agent, the L/C Issuer, the Lenders and their respective successors and assigns;
provided that neither the Borrower nor any other Loan Party shall be entitled to delegate any of its duties hereunder and shall not assign any of its rights or remedies set forth in this Agreement without the prior written consent of the
Agent and the Required Lenders in their respective sole discretion. 
  

	SECTION 14	Final Agreement. 

This Agreement, the Credit Agreement, the other Loan Documents and the other written agreements, instruments, and documents entered into
in connection therewith (collectively, the “Borrower/Lender Documents”) set forth in full the terms of agreement between the parties hereto and thereto and are intended as the full, complete, and exclusive contracts governing the
relationship between such parties, superseding all other discussions, promises, representations, warranties, agreements and understandings among the parties with respect thereto. No term of the Borrower/Lender Documents may be amended, restated,
waived or otherwise modified except in a writing signed by the party against which enforcement of the modification, 

  
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amendment, or waiver is sought. Any waiver of any condition in, or breach of, any of the foregoing in a particular instance shall not operate as a waiver of other or subsequent conditions or
breaches of the same or a different kind. The exercise or failure to exercise any rights or remedies by the Agent, the L/C Issuer or any Lender under any of the foregoing in a particular instance shall not operate as a waiver to exercise the
same or different rights and remedies in any other instances. There are no oral agreements among the parties hereto. 
  

	SECTION 15	Applicable Law. 

This Agreement and the rights and obligations of the parties hereunder (including any claims sounding in contract law or tort law arising
out of the subject matter hereof) shall be governed by, and shall be construed in accordance with, the laws of the State of New York without regard to conflicts of law principles that would result in the application of any law other than the law of
the State of New York. 
  

	SECTION 16	General Release; Covenant Not to Sue. 

 (a) In consideration of, among other things, the Agent’s, the L/C Issuer’s and the Required Lenders’ execution and delivery of this Agreement, the Borrower and each other Loan Party, on
behalf of themselves and their agents, representatives, officers, directors, advisors, employees, successors and assigns (collectively, “Releasors”), hereby forever waive, release and discharge, to the fullest extent permitted by
law, each Releasee (as hereinafter defined) from any and all liens, claims, interests and causes of action of any kind or nature (collectively, the “Claims”) that such Releasor now has or hereafter may have against any or all of the
Agent, the L/C Issuer and any Lender in any capacity and their respective affiliates, subsidiaries, shareholders and “controlling persons” (within the meaning of the federal securities laws), and their respective successors and assigns and
each and all of the officers, directors, employees, agents, attorneys and other representatives of each of the foregoing (collectively, the “Releasees”), based on facts existing on or before the Amendment Effective Date that relate
to: (i) any Loan Document, (ii) any transaction, action or omission contemplated thereby or (iii) any aspect of the dealings or relationships between or among any or all of the Borrower and the other Loan Parties, on the one hand, and
any or all of the Agent, the L/C Issuer and the Lenders, on the other hand, relating to any Loan Document or transaction, action or omission contemplated thereby. The provisions of this Section 17 shall survive the termination of this
Agreement, the Credit Agreement, the other Loan Documents and payment in full of the Obligations. 
 (b) The Borrower and each
other Loan Party, on behalf of themselves and their successors, assigns, and other legal representatives, hereby unconditionally and irrevocably agree that they will not sue any Releasee on the basis of any Claim released, remised and discharged by
the Borrower or any other Loan Party pursuant to Section 17 hereof. If the Borrower, any other Loan Party or any of its successors, assigns or other legal representatives violates the foregoing covenant, the Borrower and each other Loan
Party, each for itself and its successors, assigns and legal representatives, agrees to pay, in addition to such other damages as any Releasee may sustain as a result of such violation, all reasonable attorneys’ fees and costs incurred by any
Releasee as a result of such violation. 
 (Signature pages to follow) 

  
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 IN WITNESS WHEREOF, this Second Amendment to Forbearance Agreement and Fourth Amendment to
Amended and Restated Credit Agreement has been executed by the parties hereto as of the date first written above. 
  

											
	AQUILEX HOLDINGS LLC, as Borrower
			
		 	By:	 	AQUILEX ACQUISITION SUB III, LLC, its sole member
				
		 		 	By:	 	AQUILEX HOLDCO, L.P., its sole member
					
		 		 		 	By:	 	AQUILEX HOLDCO GP LLC, its general partner
						
		 		 		 		 	By:	 	ONTARIO TEACHERS’ PENSION PLAN BOARD, its sole member
		
	By:	 	 /s/ Darren Smart

		 	Name: Darren Smart
		 	Title: Portfolio Manager
	
	AQUILEX ACQUISITION SUB III, LLC, as a Loan Party
			
		 	By:	 	AQUILEX HOLDCO, L.P., its sole member
				
		 		 	By:	 	AQUILEX HOLDCO GP LLC, its general partner
					
		 		 		 	By:	 	ONTARIO TEACHERS’ PENSION PLAN BOARD, its sole member
		
	By:	 	 /s/ Darren Smart

		 	Name: Darren Smart
		 	Title: Portfolio Manager

  
 SIGNATURE PAGE
TO SECOND AMENDMENT TO FORBEARANCE AGREEMENT AND FOURTH 
 AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT 

 
			
	AQUILEX CORPORATION, as a Loan Party
		
	By:	 	 /s/ Jay W. Ferguson

		 	Name: Jay W. Ferguson
		 	Title: CFO and Treasurer
	
	AQUILEX HYDROCHEM, INC., as a Loan Party
		
	By:	 	 /s/ Jay W. Ferguson

		 	Name: Jay W. Ferguson
		 	Title: CFO and Treasurer
	
	AQUILEX HYDROCHEM INDUSTRIAL CLEANING, INC., as a Loan Party
		
	By:	 	 /s/ Jay W. Ferguson

		 	Name: Jay W. Ferguson
		 	Title: CFO and Treasurer
	
	AQUILEX SMS, INC., as a Loan Party
		
	By:	 	 /s/ Jay W. Ferguson

		 	Name: Jay W. Ferguson
		 	Title: CFO and Treasurer
	
	AQUILEX WSI, INC., as a Loan Party
		
	By:	 	 /s/ Jay W. Ferguson

		 	Name: Jay W. Ferguson
		 	Title: CFO and Treasurer
	
	AQUILEX FINANCE CORP., as a Loan Party
		
	By:	 	 /s/ Jay W. Ferguson

		 	Name: Jay W. Ferguson
		 	Title: CFO and Treasurer

  
 SIGNATURE PAGE
TO SECOND AMENDMENT TO FORBEARANCE AGREEMENT AND FOURTH 
 AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT 

 
			
	AQUILEX SPECIALTY REPAIR AND OVERHAUL, INC., as a Loan Party
		
	By:	 	 /s/ Jay W. Ferguson

		 	Name: Jay W. Ferguson
		 	Title: CFO and Treasurer

  
 SIGNATURE PAGE
TO SECOND AMENDMENT TO FORBEARANCE AGREEMENT AND FOURTH 
 AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT 

 
			
	ROYAL BANK OF CANADA, as the Agent
		
	By:	 	 /s/ Ann Hurley

		 	Name: Ann Hurley
		 	Title: Manager, Agency

  
 SIGNATURE PAGE
TO SECOND AMENDMENT TO FORBEARANCE AGREEMENT AND FOURTH 
 AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT 

 
			
	ROYAL BANK OF CANADA, as the L/C Issuer
		
	By:	 	 /s/ Leslie P. Vowell

		 	Name: Leslie P. Vowell
		 	Title: Attorney-in-Fact

  
 SIGNATURE PAGE
TO SECOND AMENDMENT TO FORBEARANCE AGREEMENT AND FOURTH 
 AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT 

 
			
	[NAME OF LENDER], as Lender
		
	By:	 	  

		 	Name:
		 	Title:

  
 SIGNATURE PAGE
TO SECOND AMENDMENT TO FORBEARANCE AGREEMENT AND FOURTH 
 AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENTEX-10.7

 Exhibit 10.7 
 EXECUTION VERSION 
 FOURTH AMENDMENT

 FOURTH AMENDMENT, dated as of December 23, 2011 (this “Fourth Amendment”), to the Credit Agreement,
dated as of November 15, 2011 (as amended, restated, supplemented or otherwise modified prior to the date hereof, the “Credit Agreement”), among Aquilex Holdings LLC, a Delaware limited liability company (the
“Borrower”), the Lenders party thereto, and U.S. Bank National Association, as Administrative Agent and Collateral Agent. 
 W I T N E S S E T H : 
 WHEREAS, the Borrower and the Lenders party to this Fourth Amendment are parties to the Credit Agreement (collectively, the “Amendment Parties”); and 

WHEREAS, the Amendment Parties have agreed to amend certain provisions of the Credit Agreement as described herein; 

NOW, THEREFORE, in consideration of the mutual agreements herein contained and other good and valuable consideration, the sufficiency and
receipt of which are hereby acknowledged, the parties hereto agree as follows: 
 SECTION 1. Defined Terms. Unless otherwise defined
herein, capitalized terms defined in the Credit Agreement (as amended by this Fourth Amendment, the “Amended Agreement”) and used herein shall have the meanings given to them in the Amended Agreement. 

SECTION 2. Amendments to Section 1.01 (Defined Terms). 
 (a) Section 1.01 of the Credit Agreement is hereby amended effective as of the Effective Date (as defined below) by adding thereto the following definitions in proper alphabetical order: 

“Backstop Effective Date” means the first date on which the Backstop Agreement shall become effective in accordance with
its terms. 
 “Closing Date Commitment” means, as to each Lender, its obligation to make a Loan to the Borrower
pursuant to Section 2.01 in an aggregate principal amount not to exceed the amount set forth opposite such Lender’s name on Schedule 2.01 hereto under the caption “Closing Date Commitment” or in the Assignment and Assumption
pursuant to which such Lender becomes a party hereto, as applicable, as such amount may be adjusted from time to time in accordance with this Agreement. The aggregate amount of the Closing Date Commitments is $15,000,000. 

“Incremental Commitment” means, as to each Lender, its obligation to make a Loan to the Borrower pursuant to
Section 2.01 in an aggregate 

 
principal amount not to exceed the amount set forth opposite such Lender’s name on Schedule 2.01 hereto under the caption “Incremental Commitment” or in the Assignment and
Assumption pursuant to which such Lender becomes a party hereto, as applicable, as such amount may be adjusted from time to time in accordance with this Agreement. The aggregate amount of the Incremental Commitments is $3,631,753. 

“Platinum” means [***]. 
 (b) The definition of “Commitment” set forth in Section 1.01 of the Credit Agreement is hereby restated in its entirety as follows: “Commitment” means, as to each Lender,
collectively, its Closing Date Commitment and its Incremental Commitment.” 
 (c) The definition of “Maturity
Date” set forth in Section 1.01 of the Credit Agreement is hereby amended effective as of the Effective Date by deleting the date “February 3, 2012” and inserting in lieu thereof the date “February 15, 2012”.

 (d) The definition of “Outstanding Amount” set forth in Section 1.01 of the Credit Agreement is hereby amended
effective as of the Effective Date by adding the text “or Section 2.09(c)” immediately after the text “Section 2.09(b)” appearing therein. 
 (e) The definition of “Requisite Lenders” set forth in Section 1.01 of the Credit Agreement is hereby restated in its entirety as follows: ““Requisite Lenders” means,
as of any date of determination, Lenders having more than 50% of the Total Outstandings as of such date; provided, however, that solely for purposes of determining Requisite Lenders, (i) Platinum shall not be considered to be
Lender and (ii) the Loans made by Platinum shall not be included in the calculation of Total Outstandings.” 
 SECTION 3.
Amendment to Section 2.01 (The Loans). Section 2.01 of the Credit Agreement is hereby restated in its entirety as follows: 
 “Section 2.01 The Loans. Subject to the terms and conditions set forth herein, (a) each Lender severally agrees to make to the Borrower a single loan denominated in Dollars in a principal
amount equal to such Lender’s Closing Date Commitment on the Closing Date and (b) each Lender shall be deemed to have made to the Borrower a single loan denominated in Dollars in a principal amount equal to such Lender’s Incremental
Commitment on the Backstop Effective Date. Amounts borrowed under this Section 2.01 and repaid or prepaid may not be reborrowed. Loans may be Base Rate Loans or Eurocurrency Rate Loans, as further provided herein. Proceeds of the Loans
shall be deposited in the Bridge Priority Account and used solely for the purposes set forth in Section 6.12.” 

  
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 SECTION 4. Amendments to Section 2.02 (Borrowings, Conversions and Continuations of Loans).

 (a) Section 2.02(a) of the Credit Agreement is hereby amended by inserting “and the Borrowing on the Backstop
Effective Date” immediately following the words “on the Closing Date” appearing in the proviso therein. 
 (b)
Section 2.02(b) of the Credit Agreement is hereby amended by inserting “or Section 4.02, as applicable” immediately following the reference to “Section 4.01” in the last sentence thereof. 

SECTION 5. Amendments to Section 2.06 (Termination or Reduction of Commitments). Section 2.06 of the Credit Agreement is hereby
restated in its entirety as follows: “”The Closing Date Commitment and Incremental Commitment, as applicable, of each Lender shall be automatically and permanently reduced to $0 upon the making of such Lender’s Loans on the Closing
Date and/or the Backstop Effective Date, as applicable, pursuant to Section 2.01.” 
 SECTION 6. Amendment to
Section 2.09 (Fees). 
 (a) Section 2.09 of the Credit Agreement is hereby amended by adding a new
Section 2.09(c) immediately after Section 2.09(b) as follows: 
 “(c) On the Backstop Effective Date, the Borrower
shall pay to each Lender who is a party to the Backstop Agreement a backstop commitment fee equal to the aggregate amount of $3,631,753 payable to each party in the amount specified on Schedule 2.09(c) hereto, which amount shall be paid by
capitalizing and adding such amount to the Outstanding Amount by the extension (or deemed extension) of Loans on the Backstop Effective Date pursuant to Section 2.01(b). Such capitalized fee amount shall for all purposes constitute principal of
the Loans and shall bear interest as provided herein from the Backstop Effective Date.” 
 SECTION 7. Amendments to Article IV.
Article IV of the Credit Agreement is hereby amended by inserting the following new Section 4.02 immediately following the final paragraph of Section 4.01: 
 “4.02 Conditions of Loans on Backstop Effective Date. The obligation of each Lender to make Loans hereunder on the Backstop Effective Date is subject to satisfaction of the following
conditions precedent except as otherwise agreed in writing between the Borrower and the Lenders: 
 (a) The Lenders’ receipt
of the following, each of which shall be originals, facsimiles or electronic transmission in .pdf format (followed promptly by originals) unless otherwise specified, each properly executed by a Responsible Officer of the signing Loan Party, each in
form and substance reasonably satisfactory to the Requisite Lenders and legal counsel to the Lenders: 
 (i)
executed counterparts of the Backstop Agreement; and 

  
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 (ii) executed counterparts of the Support Agreement. 

(b) No Default shall exist, or would result from such proposed Loans.” 
 SECTION 8. Amendment to Schedules to Credit Agreement. 
 (a) The
Schedules to the Credit Agreement are hereby amended effective as of the Effective Date by (i) amending and restating Schedule 2.01 in its entirety as set forth on Schedule 1 attached hereto and (ii) adding a new Schedule 2.09(c) as set
forth on Schedule 2 attached hereto. 
 SECTION 9. Conditions to Effectiveness. This Fourth Amendment shall become effective upon
the date on which the Administrative Agent shall have received this Fourth Amendment, executed and delivered by the duly authorized officers of the Borrower and the Lenders (the “Effective Date”). 

SECTION 10. Condition Subsequent. Within three (3) Business Days from the date hereto (or such later date agreed to by the Requisite
Lenders in their sole discretion), the Borrower shall deliver to the Administrative Agent an original Note executed by the Borrower in favor of each Lender that has requested a Note. Failure to deliver such Notes within the required time period
shall constitute an Event of Default under the Credit Agreement. 
 SECTION 11. Representations and Warranties. The Borrower
represents and warrants to the Lenders that as of the Effective Date this Fourth Amendment has been duly authorized, executed and delivered by the Borrower and constitutes the Borrower’s legal, valid and binding obligation, enforceable against
the Borrower in accordance with its terms, subject to applicable bankruptcy, insolvency, reorganization, moratorium or other laws affecting creditors’ rights generally and subject to general principles of equity, regardless of whether
considered in a proceeding in equity or at law. 
 SECTION 12. Effect of the Fourth Amendment. Except as expressly set forth herein,
this Fourth Amendment shall not by implication or otherwise limit, impair, constitute a waiver of or otherwise affect the rights and remedies of the Lenders or the Administrative Agent under the Amended Agreement or any other Loan Document, and
shall not alter, modify, amend or in any way affect any of the terms, conditions, obligations, covenants or agreements contained in the Amended Agreement or any other provision of the Loan Documents, all of which are ratified and affirmed in all
respects and shall continue in full force and effect. Nothing herein shall be deemed to entitle the Borrower, the other Loan Parties or any other person to a consent to, or a waiver, amendment, modification or other change of, any of the terms,
conditions, obligations, covenants or agreements contained in the Amended Agreement or any other Loan Document in similar or different circumstances. 
 SECTION 13. Counterparts. This Fourth Amendment may be executed by one or more of the parties to this Fourth Amendment on any number of separate counterparts, any may be

  
 4 

 
delivered in person, by mail, by facsimile or through any other form of electronic transmission, and all of said counterparts taken together shall be deemed to constitute one and the same
instrument. 
 SECTION 14. GOVERNING LAW. THIS FOURTH AMENDMENT AND THE RIGHTS AND OBLIGATIONS OF THE PARTIES UNDER THIS
FOURTH AMENDMENT SHALL BE GOVERNED BY, AND CONSTRUED AND INTERPRETED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK. 

[Remainder of page left intentionally blank] 

  
 5 

 EXECUTION VERSION 

IN WITNESS WHEREOF, the parties hereto have caused this Fourth Amendment to be duly executed and delivered by their respective proper and
duly authorized officers as of the day and year first above written. 
  

											
		 	BORROWER:
		
		 	AQUILEX HOLDINGS LLC
			
		 	By:	 	AQUILEX ACQUISITION SUB III, LLC
				
		 		 	By:	 	AQUILEX HOLDCO L.P.,
its sole member
					
		 		 		 	By:	 	AQUILEX HOLDCO GP, LLC,
its general partner
						
		 		 		 		 	By:	 	ONTARIO TEACHERS’ PENSION PLAN BOARD,
its sole member
			
		 	 By:
	 	 /s/ Darren Smart

		 		 	Name: Darren Smart
		 		 	Title: Portfolio Manager

							
		 	To approve and become a party to the Fourth Amendment as a Lender:

							
	
	 CENTERBRIDGE CAPITAL PARTNERS SBS II, L.P.

			
		 	By:	 	 /s/ Jeff Gelfand

		 		 	Name: Jeff Gelfand
		 		 	Title: Senior Managing Director

  
 [Signature
Page to Fourth Amendment] 

							
		 	To approve and become a party to the Fourth Amendment as a Lender:

							
	
	 CCP II DEBT AQLX I, LLC

			
		 	By:	 	 /s/ Jeff Gelfand

		 		 	Name: Jeff Gelfand
		 		 	Title: Senior Managing Director

  
 [Signature
Page to Fourth Amendment] 

							
		 	To approve and become a party to the Fourth Amendment as a Lender:

							
	
	 CCP II DEBT ACQUISITION, L.P.

			
		 	By:	 	 /s/ Jeff Gelfand

		 		 	Name: Jeff Gelfand
		 		 	Title: Senior Managing Director

  
 [Signature
Page to Fourth Amendment] 

							
		 	To approve and become a party to the Fourth Amendment as a Lender:

							
	
	FS INVESTMENT CORPORATION
	
	 By: GSO / BLACKSTONE DEBT FUNDS MANAGEMENT LLC, as Sub-Advisor

			
		 	By:	 	 /s/ Daniel H. Smith

		 		 	Name: Daniel H. Smith
		 		 	Title: Authorized Signatory

  
 [Signature
Page to Fourth Amendment] 

							
		 	To approve and become a party to the Fourth Amendment as a Lender:

							
	
	REDWOOD MASTER FUND, LTD.
	
	 By: REDWOOD CAPITAL MANAGEMENT, LLC, its Investment Manager

			
		 	By:	 	 /s/ Jonathan Kolatch

		 		 	Name: Jonathan Kolatch
		 		 	Title: Managing Member

  
 [Signature
Page to Fourth Amendment] 

							
		 	To approve and become a party to the Fourth Amendment as a Lender:

							
	
	 SPHERE CAPITAL, LLC – SERIES D

			
		 	By:	 	 /s/ Eva Kalawski

		 		 	Name: Eva Kalawski
		 		 	Title: Vice President & Secretary

  
 [Signature
Page to Fourth Amendment]

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