Document:

Amendment No. 2 to Credit Agreement

 Exhibit 10.1 

EXECUTION COPY 

AMENDMENT NO. 2 TO CREDIT AGREEMENT 

THIS AMENDMENT NO. 2 TO CREDIT AGREEMENT (this “Amendment”), dated as of May 10, 2010, is made by and among Great
Lakes Dredge & Dock Corporation (the “Borrower”), the other “Loan Parties” from time to time party to the Credit Agreement referred to and defined below (together with the Borrower, the “Loan
Parties”), the Lenders (as defined below) signatory hereto and Bank of America, N.A. (successor by merger to LaSalle Bank National Association) as Swing Line Lender, Sole Lead Arranger, Issuing Lender and Administrative Agent (in such
capacity, the “Administrative Agent”). Capitalized terms used herein and not otherwise defined herein shall have the meanings ascribed to such terms in the Credit Agreement referred to and defined below. 

W I T N E S S E T H: 

WHEREAS, the Borrower, the other Loan Parties, the financial institutions from time to time party thereto (collectively, the
“Lenders”), the Administrative Agent and the Issuing Lender have entered into that certain Credit Agreement dated as of June 12, 2007 (as amended, restated, supplemented or otherwise modified from time to time, the
“Credit Agreement”), pursuant to which, among other things, the Lenders have agreed to provide, subject to the terms and conditions contained therein, certain loans and other financial accommodations to the Borrower; 

WHEREAS, the Borrower, the Lenders and the Administrative Agent have agreed, pursuant to the terms hereof, to amend the Credit Agreement
to effect a reduction to zero of the Revolving Loan Commitment of Lehman Commercial Paper Inc. (“Lehman”) on a non-pro rata basis, and to cause Lehman to no longer be a Lender under the Credit Agreement; and 

WHEREAS, subject to the terms and conditions of this Amendment, the parties have agreed to so amend the Credit Agreement; 

NOW, THEREFORE, in consideration of the foregoing premises, the terms and conditions stated herein and other valuable consideration, the
receipt and sufficiency of which are hereby acknowledged by the Borrower, the other Loan Parties, the Lenders, Lehman and the Administrative Agent, such parties hereby agree as follows: 

1. Amendments to Credit Agreement. Subject to the satisfaction of each of the conditions set forth in Section 2 of
this Amendment, the Credit Agreement is hereby amended as follows: 
 (a) Schedule I of the Credit
Agreement is hereby amended as follows: 
 (i) The definition of “Lenders” is hereby amended to
delete such definition in its entirety and to replace such definition with the following definition: 

“Lenders” means the institutions listed on the signature pages hereof and each institution that shall
become a party hereto pursuant to Section 9.7; provided, however, that from and after the “Effective Date” under and as defined 

 
in that certain Amendment No. 2 to this Agreement dated as of as of May 10, 2010 among the Borrower, the Administrative Agent and certain of the Lenders, Lehman Commercial Paper Inc.
shall no longer constitute a “Lender” hereunder. 
 (ii) The definition of “Revolving
Commitment Amount” is hereby amended to delete such definition in its entirety and to replace such definition with the following definition: 

“Revolving Commitment Amount” means $145,000,000, as the same may be reduced pursuant to
Section 2.2, or increased pursuant to Section 2.23, after the “Effective Date” under and as defined in that certain Amendment No. 2 to this Agreement dated as of May 10, 2010 among the Borrower, the
Administrative Agent and certain of the Lenders. 
 (b) Schedule V of the Credit Agreement is hereby
replaced with Schedule V attached hereto as Exhibit A. 
 2. Effectiveness of this Amendment; Conditions
Precedent. The provisions of Section 1 of this Amendment shall be deemed to have become effective as of the date first written above (the “Effective Date”), but such effectiveness shall be expressly conditioned upon
the Administrative Agent’s receipt of executed counterparts of this Amendment executed by Authorized Officers of the Borrower and the other Loan Parties, the Majority Lenders and Lehman. 

3. Representations, Warranties and Covenants. 

(a) The Borrower and each other Loan Party hereby represents and warrants that this Amendment and the Credit Agreement as
amended hereby (collectively, the “Amendment Documents”) constitute legal, valid and binding obligations of the Borrower and the other Loan Parties enforceable against the Borrower and the other Loan Parties in accordance with their
terms. 
 (b) The Borrower and each other Loan Party hereby represents and warrants that its execution and
delivery of this Amendment, and the performance of the Amendment Documents, have been duly authorized by all proper corporate or limited liability company action, do not violate any provision of its organizational documents, will not violate any
law, regulation, court order or writ applicable to it, and will not require the approval or consent of any governmental agency, or of any other third party under the terms of any contract or agreement to which it or any of its Affiliates is bound
(which has not been previously obtained), including without limitation, the Note Indenture and the Bonding Agreement. 

(c) The Borrower and each other Loan Party hereby represents and warrants that, both before and after giving effect to the
provisions of this Amendment, (i) no Default or Event of Default has occurred and is continuing or will have occurred and be continuing and (ii) all of the representations and warranties of the Borrower and each other Loan Party contained
in the Credit Agreement and in each other Loan Document (other than representations and warranties which, in accordance with their express terms, 

 

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are made only as of an earlier specified date) are, and will be, true and correct as of the date of its execution and delivery hereof or thereof in all material respects as though made on and as
of such date. 
 4. Reaffirmation, Ratification and Acknowledgment. The Borrower and each other Loan Party hereby
(a) ratifies and reaffirms all of its payment and performance obligations, contingent or otherwise, and each grant of security interests and liens in favor of the Administrative Agent, under each Loan Document to which it is a party,
(b) agrees and acknowledges that such ratification and reaffirmation is not a condition to the continued effectiveness of such Loan Documents and (c) agrees that neither such ratification and reaffirmation, nor the Administrative
Agent’s, or any Lender’s solicitation of such ratification and reaffirmation, constitutes a course of dealing giving rise to any obligation or condition requiring a similar or any other ratification or reaffirmation from the Borrower or
such other Loan Parties with respect to any subsequent modifications to the Credit Agreement or the other Loan Documents. As modified hereby, the Credit Agreement is in all respects ratified and confirmed, and the Credit Agreement as modified by
this Amendment shall be read, taken and so construed as one and the same instrument. Each of the Loan Documents shall remain in full force and effect and are hereby ratified and confirmed. Neither the execution, delivery nor effectiveness of this
Amendment shall operate as a waiver of any right, power or remedy of the Administrative Agent or the Lenders, or of any Default or Event of Default (whether or not known to the Administrative Agent or the Lenders), under any of the Loan Documents.
This Amendment shall constitute Loan Documents for purposes of the Credit Agreement. 
 5. Effect of this Amendment. From
and after the Effective Date, (a) Lehman shall have no further obligation to fund any amount or extend any credit under the Loan Documents and shall no longer be considered a Lender thereunder, (b) the Revolving Commitment of each Lender
other than Lehman shall remain unchanged, as set forth in amended Schedule V attached hereto, (c) the Revolving Credit Percentage of each Lender other than Lehman shall be increased as set forth in amended Schedule V attached
hereto, including, without limitation, with respect to participation obligations for currently outstanding Letters of Credit pursuant to Section 3.4 of the Credit Agreement, and reimbursement and indemnification obligations thereafter
claimed by the Administrative Agent-Related Persons pursuant to Section 8.7 of the Credit Agreement (regardless of whether the events and circumstances giving rise to such reimbursement or indemnification obligations occurred prior to or
after the Effective Date), and (d) notwithstanding anything herein to the contrary, any and all interest on outstanding Loans, and Letter of Credit Fees, in each case which have accrued and are allocable to Lehman with respect to periods prior
to the Effective Date (based upon its Revolving Credit Percentage in effect prior to the Effective Date), but which are paid to the Administrative Agent or the Lenders on or after the Effective Date, shall be paid to Lehman. 

6. Mutual Release. 

(a) For good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, and in connection
with this Amendment, each of the Borrower, the Loan Parties, the Administrative Agent and the Lenders (other than Lehman) (each a “Remaining Party”) hereby unconditionally and irrevocably waives all claims, suits, debts, liens,
losses, causes of action, demands, rights, damages or costs, or expenses of 
  

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any kind, character or nature whatsoever, known or unknown, fixed or contingent, which any such Remaining Party may have or claim to have against Lehman (in its capacity as a lender) or its
agents, employees, officers, affiliates, directors, representatives, attorneys, successors and assigns (collectively, the “Released Lehman Parties”), to the extent arising out of or in connection with the Loan Documents or any prior
or future Borrower request to fund or make an extension of credit under the Credit Agreement including, without limitation, any past or future failure by Lehman to fund any Loan required to be funded by it under the Credit Agreement, but excluding
any breach by Lehman of its contractual obligations under this Amendment (collectively, the “Remaining Party Claims”). Each of the Remaining Parties further agree forever to refrain from commencing, instituting or prosecuting any
lawsuit, action or other proceeding against any Released Lehman Party, with respect to any and all of the foregoing described waived, released, acquitted and discharged Remaining Party Claims and from exercising any right of recoupment or setoff
that it may have under a master netting agreement or otherwise against any Released Lehman Party with respect to Obligations under the Loan Documents. Each of the Released Lehman Parties shall be a third party beneficiary of this Amendment.

 (b) For good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, and in
connection with this Amendment, Lehman hereby unconditionally and irrevocably waives all claims, suits, debts, liens, losses, causes of action, demands, rights, damages or costs, or expenses of any kind, character or nature whatsoever, known or
unknown, fixed or contingent, which Lehman (in its capacity as a lender) may have or claim to have against any Remaining Party or its agents, employees, officers, affiliates, directors, representatives, attorneys, successors and assigns
(collectively, the “Released Remaining Parties”), to the extent arising out of or in connection with the Loan Documents or any prior or future Borrower request to fund or make an extension of credit under the Credit Agreement, but
excluding any breach by any such Released Remaining Party of its contractual obligations under this Amendment (collectively, the “Lehman Claims”). Lehman further agrees forever to refrain from commencing, instituting or prosecuting
any lawsuit, action or other proceeding against any Released Remaining Party, with respect to any and all of the foregoing described waived, released, acquitted and discharged Lehman Claims and from exercising any right of recoupment or setoff that
it may have under a master netting agreement or otherwise against any such Released Remaining Party with respect to Obligations under the Loan Documents. Each of the Released Remaining Parties shall be a third party beneficiary of this Amendment.

 7. Governing Law. THIS AMENDMENT SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW
YORK WITHOUT REGARD TO ITS CONFLICTS OF LAW PRINCIPLES (OTHER THAN THE PROVISIONS OF 5-1401 AND 5-1402 OF THE NEW YORK GENERAL OBLIGATIONS LAW). 

8. Administrative Agent’s Expenses. The Borrower hereby agrees to promptly reimburse the Administrative Agent for all of the
reasonable out-of-pocket expenses, including, without limitation, attorneys’ and paralegals’ fees, it has heretofore or hereafter incurred or incurs in connection with the preparation, negotiation and execution of this Amendment and the
other documents, agreements and instruments contemplated hereby. 
  

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 9. Counterparts. This Amendment may be executed in counterparts, each of which shall
be an original and all of which together shall constitute one and the same agreement among the parties. 
 * * * * 

 

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 IN WITNESS WHEREOF, this Amendment has been duly executed as of the day and year first above
written. 
  

			
	GREAT LAKES DREDGE & DOCK CORPORATION
		
	By:	 	 /s/ Deborah A. Wensel

	Name:	 	 Deborah A. Wensel

	Title:	 	 Chief Financial Officer

	
	GREAT LAKES CARIBBEAN DREDGING, INC.
		
	By:	 	 /s/ Deborah A. Wensel

	Name:	 	 Deborah A. Wensel

	Title:	 	 Chief Financial Officer

	
	GREAT LAKES DREDGE & DOCK COMPANY, LLC
		
	By:	 	 /s/ Deborah A. Wensel

	Name:	 	 Deborah A. Wensel

	Title:	 	 Chief Financial Officer

	
	DAWSON MARINE SERVICES COMPANY
		
	By:	 	 /s/ Deborah A. Wensel

	Name:	 	 Deborah A. Wensel

	Title:	 	 Chief Financial Officer

Signature Page to 

Amendment No. 2 to Credit Agreement 

			
	NASDI HOLDINGS CORPORATION
		
	By:	 	 /s/ Deborah A. Wensel

	Name:	 	 Deborah A. Wensel

	Title:	 	 Chief Financial Officer

	
	NASDI, LLC
		
	By:	 	 /s/ Deborah A. Wensel

	Name:	 	 Deborah A. Wensel

	Title:	 	 Chief Financial Officer

	
	FIFTY-THREE DREDGING CORPORATION
		
	By:	 	 /s/ Paul E. Dinquel

	Name:	 	 Paul E. Dinquel

	Title:	 	 Vice President

Signature Page to 

Amendment No. 2 to Credit Agreement 

			
	 BANK OF AMERICA, N.A., as successor by

merger to LaSalle Bank National Association,
 as
Administrative Agent

		
	By:	 	 /s/ Bozana Janociak

	Name:	 	 Bozana Janociak

	Title:	 	 Assistant Vice President

Signature Page to 

Amendment No. 2 to Credit Agreement 

			
	 BANK OF AMERICA, N.A., as a Lender,

Swing Line Lender and Issuing Lender

		
	By:	 	 /s/ Jonathan M. Phillips

	Title:	 	Senior Vice President

 Signature
Page to 
 Amendment No. 2 to Credit Agreement 

			
	 GENERAL ELECTRIC CAPITAL CORPORATION,

as a Lender and as Syndication Agent

		
	By:	 	 /s/ Danuta Buellesbach

	Title:	 	Duly Authorized Signatory

Signature Page to 

Amendment No. 2 to Credit Agreement 

			
	 FIFTH THIRD BANK, as a Lender

and as Co-Documentation Agent

		
	By:	 	 /s/ Neil Mesch

	Title:	 	Vice President

 Signature Page to

 Amendment No. 2 to Credit Agreement 

			
	 PNC BANK, NATIONAL ASSOCIATION,

as successor to National City Bank,
 as a Lender
and as Co-Documentation Agent

		
	By:	 	 /s/ Jon R. Hinard

	Title:	 	Senior Vice President

 Signature
Page to 
 Amendment No. 2 to Credit Agreement 

			
	 RBS CITIZENS, N.A., as successor

by merger to Charter One Bank,
 as a Lender and
as Co-Documentation Agent

		
	By:	 	  

	Title:	 	

 Signature Page to 

Amendment No. 2 to Credit Agreement 

			
	WELLS FARGO BANK, NATIONAL ASSOCIATION, as a Lender
		
	By:	 	 /s/ Joseph Colianni

	Title:	 	Managing Director

 Signature Page
to 
 Amendment No. 2 to Credit Agreement 

			
	MB FINANCIAL BANK, as a Lender
		
	By:	 	 /s/ Henry Wessel

	Title:	 	Vice President

 Signature Page to

 Amendment No. 2 to Credit Agreement 

			
	LEHMAN COMMERCIAL PAPER INC.
		
	By:	 	 /s/ Maria M. Lund

	Title:	 	Authorized Signatory

 Signature
Page to 
 Amendment No. 2 to Credit Agreement 

 EXHIBIT A 

SCHEDULE V 

COMMITMENT SCHEDULE 
  

							
	 LENDER
	  	REVOLVING LOAN
COMMITMENT	  	REVOLVING CREDIT
PERCENTAGE	 
			
	 Bank of America, N.A.
	  	$	37,500,000.00	  	25.8620689	% 
			
	 General Electric Capital Corporation
	  	$	22,500,000.00	  	15.5172413	% 
			
	 Fifth Third Bank
	  	$	20,000,000.00	  	13.7931034	% 
			
	 PNC Bank, National Association
	  	$	20,000,000.00	  	13.7931034	% 
			
	 RBS Citizens, N.A.
	  	$	20,000,000.00	  	13.7931034	% 
			
	 Wells Fargo Bank, National Association
	  	$	15,000,000.00	  	10.3448275	% 
			
	 MB Financial Bank
	  	$	10,000,000.00	  	6.8965517	% 
			
	 Total
	  	$	145,000,000.00	  	100.00	%Services Agreement dated January 1, 2010

 Exhibit 4.2 

Services Agreement entered into by and between Carso Global Telecom, S.A.B. de C.V., hereinafter the “Supplier”, represented by C.P. Armando
Ibañez Vázquez and Teléfonos de México, S.A.B. de C.V., hereinafter “Telmex”, represented by Lic. Héctor Slim Seade, in accordance with the following recitals and clauses: 

RECITALS 
  

	1.	The “Supplier” represents that: 

  

	a)	It is a “sociedad mercantil” organized under the laws of the Mexican Republic with principal place of business at Insurgentes Sur 3500, Col.
Peña Pobre, Delegación Tlalpan, 14060 Mexico City. 

  

	b)	Its corporate purpose involves, among other activities, promoting, organizing and managing all kind of companies, commercial and civil ones and offering administrative,
organizational, fiscal, legal and advising services for companies. 

  

	c)	It has the resources needed for rendering of the services pursuant to this agreement. 

 

	2.	“Telmex” represents that: 

  

	a)	It is a “sociedad mercantil” organized under the laws of the Mexican Republic with principal place of business at Parque Vía No. 190, Col.
Cuauhtémoc, Delegación Cuauhtémoc, 06599 Mexico City. 

  

	b)	Its corporate purpose is, in general, to build, install, maintain, operate and employ a telephone and telecommunications public network to render the domestic public
service of voice, sound, data, text and images signal conduction and domestic and international long distance service and the public service of basic telephony; to provide and obtain all kinds of technical, scientific and administrative consulting
and assistance services and to enter into any agreement related to its corporate purpose and that are lawful for a “sociedad anónima”. 

 

	c)	It wishes to obtain the services that the “Supplier” will provide to it, in order to perform its operations in the best possible manner.

 CLAUSES 

FIRST. The “Supplier” hereby engages to provide “Telmex” consulting and advising services on the management and operation matters
specified below: 
  

	1.	Evaluation of the senior officers, positions and personnel of “Telmex” and its domestic and foreign subsidiaries; 

 

	2.	Revision and, if any, support in the restructuring of labor agreements; 

  

	3.	Technical, administrative and financial planning; 

  

	4.	Implementation of administrative and operational systems and controls; 

  

	5.	Investment planning and negotiation to optimize the profits return from the company’s resources: 

 

	 	a)	Optimizing the design and equipment investments for the telecommunications network. 

 

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	 	b)	Analyses and assessment for new investments and acquisitions. 

  

	6.	Development of the “Telmex” transformation programs to improve the operative efficiency, modernize and make it grow aggressively, in such a way that it
improves and maintains the quality of services as per international standards; 

  

	7.	Restructuring of policies regarding tariff, commercial, technical and services issues; 

 

	8.	Development of personnel relocation plans; 

  

	9.	Support in the management of the “Instituto Tecnológico de Teléfonos de México, S.C.”; 

 

	10.	Carrying out, if any, the real estate investment plans to substantially reduce their number and amounts; 

 

	11.	Establishment of construction procedures; 

  

	12.	Assessment of the alternatives related to the technical and economic studies made for the operation of “Telmex”. 

In general, regeneration, reorganizing and restructuring of “Telmex” and its subsidiaries through the planning, performance and supervision of
the company’s areas. 
 The services above described shall be called hereinafter the “Services”. 

SECOND. “Telmex” does not delegate to the “Supplier”, in any way, decision-making authority on the company’s management. It
remains in the sole discretion and under the exclusive responsibility of the Board of Directors, the Chief Executive Officer and/or the Corporate Committees of “Telmex” to make the decisions about the company’s management, without any
interference by the “Supplier”. 
 THIRD. The “Supplier” shall provide the “Services” with its own resources or
through such other third parties, provided that in this last case the “Supplier” shall take all the responsibility for the third parties it appoints. 

FOURTH. “Telmex” agrees to pay the “Supplier” for the “Services” rendered, a monthly amount equivalent in Mexican pesos of
US$1,875,000.00 (ONE MILLION EIGHT HUNDRED SEVENTY FIVE THOUSAND U.S. DOLLARS) plus the corresponding value added tax. 
 This consideration
shall be payable by “Telmex” to the “Supplier” no later than the last business day of every month. 
 The exchange rate to
pay obligations in foreign currency payable in the Mexican Republic published in the “Diario Oficial de la Federación”, shall be used to determine the amount in Mexican pesos to be paid. 

If “Telmex” requires additional services not included herein, the “Supplier” shall charge such additional amount as may be agreed by
the parties. 
 The invoice issued by the “Supplier” for any payments made by “Telmex” under the terms of this agreement
shall meet the fiscal requirements of the administrative and legal applicable regulations, including the express and separate translation of the value added tax. 

FIFTH. The “Supplier” intends to fulfill in good faith and in the best possible manner the obligations assumed hereunder and shall render the
“Services” with its own resources or resources from third parties, taking unconditional and strict responsibility in respect to the personnel it appoints for the rendering of the “Services”. Therefore, the “Supplier”
shall be the sole responsible party for the labor agreements or any other agreements entered into with such personnel; and, as the case may be, the payment of fees and others labor benefits as well as the contributions to the “Instituto
Mexicano del Seguro Social”, “Infonavit”, and the income tax and other tax obligations; from disputes that may arise with such personnel and any other claim due to labor accidents or professional illnesses of such personnel.

  

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 “Telmex” agrees that upon request of the “Supplier”, it shall grant sufficient mandates
to directors, advisors and committee members of the “Supplier” , so that, if necessary, such individuals are able to perform the “Services” on behalf of “Telmex”, provided that there shall not be any labor relationship
between such individuals and “Telmex”. The previous paragraph shall apply in respect of the relationship among the “Supplier” and its directors, advisors, and committee members. 

SIXTH. This agreement shall enter into force on the signature date and terminate precisely on December 31, 2010. 

SEVENTH. All issues related to the validity, construction and enforcement of this agreement, shall be governed by the laws of Mexico, Federal District
and applicable Federal laws, and for the resolution of any court procedure that may arise in connection with the same, the parties expressly submit to the competent courts of Mexico City, Federal District, expressly waiving any other jurisdiction by
reason of their nationality, address or residence. 
 This agreement is executed in two counterparts in Mexico City, Federal District on
January 1, 2010. 
  

			
	 The “Supplier”

Carso Global Telecom, S.A.B. de C.V.
	 	 “Telmex”

Teléfonos de México, S.A.B. de C.V.

		
	 /s/ Armando Ibañez
Vázquez        
 C.P. Armando Ibañez Vázquez

Attorney in fact
	 	 /s/ Héctor Slim
Seade        
 Lic. Héctor Slim Seade

Chief Executive Officer and Attorney in fact

	 
		
	 Witness

/s/ Francisco Angeles Mayorga        

C.P. Francisco Angeles Mayorga
	 	

  

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