3rd Amended & Restated Underwriting & Continuing Indemnity Agreement

THIS THIRD AMENDED AND RESTATED UNDERWRITING AND CONTINUING INDEMNITY AGREEMENT (the “Agreement”), made and entered into this 22nd day of December, 2003, is among (i) GREAT LAKES DREDGE & DOCK CORPORATION, a Delaware corporation (“HOLDINGS”), and the SUBSIDIARIES of HOLDINGS from time to time signatories hereto (collectively with HOLDINGS, the “INDEMNITORS”), and (ii) TRAVELERS CASUALTY AND SURETY COMPANY, a Connecticut corporation (as assignee of Reliance Insurance Company, a Pennsylvania corporation, United Pacific Insurance Company, a Pennsylvania corporation, Reliance National Insurance Company, a Delaware corporation, and Reliance Surety Company, a Delaware corporation) (“TCASC”), and TRAVELERS CASUALTY AND SURETY COMPANY OF AMERICA, a Connecticut corporation (“TRAVELERS AMERICA” and together with TCASC, “TRAVELERS”).

WHEREAS, the PRINCIPALS are engaged in the business, among other things, of dredging, dredging reclamation, aggregate mining and supply, and marine construction in the United States and in other countries, and any PRINCIPAL, individually, jointly with others or on behalf of any of its SUBSIDIARIES, AFFILIATES or divisions or their SUBSIDIARIES, AFFILIATES or divisions now in existence or hereafter formed or acquired, or on behalf of third-party Persons, may desire or be required from time to time in connection with these businesses to deliver certain BOND(s) to OBLIGEES; and

WHEREAS, certain of the INDEMNITORS, the PRINCIPALS and TRAVELERS are parties to that certain Second Amended and Restated Underwriting and Continuing Indemnity Agreement (the “SECOND AMENDMENT AND RESTATEMENT”) dated as of August 19, 1998, which amended and restated that certain First Amended and Restated Underwriting and Continuing Indemnity Agreement dated as of September 24, 1997 (“FIRST AMENDMENT AND RESTATEMENT”), which amended and restated that certain Amended Agreement dated as of October 15, 1991, among certain of the PRINCIPALS, certain AFFILIATES of the PRINCIPALS and TRAVELERS (as amended and restated by the FIRST AMENDMENT AND RESTATEMENT and the SECOND AMENDMENT AND RESTATEMENT, and as otherwise amended or modified, the “EXISTING AGREEMENT”); and

WHEREAS, in accordance with the terms of the EXISTING AGREEMENT, TRAVELERS has heretofore executed or procured and, upon the express condition that this Agreement and the other UNDERWRITING DOCUMENTS be executed, TRAVELERS may continue to execute or procure the execution of BOND(s), and TRAVELERS may continue previously executed BOND(s) and may forbear cancellation of such BOND(s); and

WHEREAS, each of the INDEMNITORS recognizes that BONDS are a necessary and desirable adjunct to the businesses done and to be done by the PRINCIPALS and desires to accommodate the financial, security, indemnity, exoneration and other requirements of TRAVELERS as an inducement to TRAVELERS to become surety upon obligations of the

PRINCIPALS and has therefore agreed to be bound by this Agreement and the other UNDERWRITING DOCUMENTS to which it is a party and has agreed to exercise its best efforts to permit and require the PRINCIPALS to honor and perform all of the terms of this Agreement; and

WHEREAS, TRAVELERS has agreed to act as surety or procure surety BONDS for the PRINCIPALS, subject to the understanding of the parties that TRAVELERS is under no obligation to act as surety for every bond of the PRINCIPALS, that TRAVELERS shall have the right to refuse to execute BONDS for any reason, including, without limitation, with respect to CONTRACTS which in TRAVELERS’ sole judgment present risks not contemplated by this Agreement and that the PRINCIPALS are under no obligation to obtain BONDS from TRAVELERS; and

WHEREAS, the INDEMNITORS and the PRINCIPALS now desire to amend and restate the EXISTING AGREEMENT on the terms and conditions set forth in this Agreement.

NOW, THEREFORE, in consideration of the mutual agreements set forth herein, the execution or procurement of any BOND(s) by TRAVELERS or the forbearance or cancellation of any existing BOND(s) by TRAVELERS and as an inducement to such execution, procurement or forbearance, we, the undersigned PRINCIPALS and INDEMNITORS, agree and bind ourselves, our successors and assigns, jointly and severally, as follows:

SECTION 1.1 DEFINED TERMS. For the purposes of this Agreement, the following terms shall have the meanings listed below:

“AFFILIATE” means, with respect to any PERSON, any other PERSON or group acting in concert with such PERSON that, directly or indirectly, through one or more intermediaries, controls, or is controlled by, or is under the common control with such PERSON. For purposes of this definition, “control” (including, with correlative meanings, the terms “controlled by” and “under common control with”), as used with respect to any PERSON or group of PERSONS, shall mean the possession, directly or indirectly, of the power to direct or cause the direction of management and policies of such PERSON, whether through the ownership of voting securities or by contract or otherwise.

“AUTHORIZED OFFICER” means, with respect to any PERSON, the chief executive officer, president, chief financial officer, treasurer, assistant treasurer, controller or any vice president of such PERSON.

“BANK LOAN FACILITY” means that certain Credit Agreement dated as of December 22, 2003, by and among GLDD Acquisitions Corp., HOLDINGS, certain corporate affiliates thereof, the financial institutions from time to time parties thereto and Bank of America, N.A., as administrative agent to such financial institutions, and the documents, instruments and agreements executed and delivered in connection therewith, as all of the same may be amended, restated, supplemented or otherwise modified from time to time, and any credit agreement or

other agreement or agreements relating to any refinancing, extension, renewal or replacement, in whole or in part, thereof.

“BOND(s)” means any surety agreements, undertakings, or instruments of guarantee signed by TRAVELERS on behalf of any PRINCIPAL, whether executed before or after the execution of this Agreement.

“CONTINGENT LIABILITY” means any agreement, undertaking or arrangement by which any Person guarantees, endorses or otherwise becomes or is contingently liable upon (by agreement, contingent, or otherwise, to provide funds for payment, to supply funds to, or otherwise to invest in, a debtor, or otherwise to assure a creditor against loss) the indebtedness, obligation or any other liability of any other Person (other than by endorsements of instruments in the course of collection), or guarantees the payment of dividends or other distributions upon the shares of any other PERSON.

“CONTRACT(s)” means any contract referred to or described in any BOND(s) issued on behalf of any PRINCIPAL.

“DEBT” means and includes, with respect to any PERSON, (i) indebtedness for borrowed money, (ii) obligations evidenced by bonds (including, without limitation, license, bid, performance, lien or payment bonds), debentures, notes or other similar instruments, (iii) obligations which have been incurred in connection with the acquisition of property or services (including, without limitation, obligations to pay the deferred purchase price of property or services), excluding trade payables and accrued expenses incurred in the ordinary course of business, (iv) obligations secured by any LIEN or other charge upon property or assets owned by such PERSON, even though such PERSON has not assumed or become liable for the payment of such obligations, (v) obligations created or arising under any conditional sale or other title retention agreement with respect to property acquired by such PERSON, notwithstanding the fact that the rights and remedies of the seller, lender or lessor under such agreement in the event of default are limited to repossession or sale of property, (vi) the principal amount of any capital lease and (vii) reimbursement obligations with respect to letters of credit.

“DEBT INDENTURE” means that certain Indenture dated as of December 22, 2003, by and among HOLDINGS, certain of the SUBSIDIARIES of HOLDINGS, and The Bank of New York, as Trustee, governing the issuance by HOLDINGS of $175,000,000 in original principal amount of its 7 3/4% Senior Subordinated Notes due 2013, as amended, restated, supplemented, modified, refunded, refinanced or replaced, in whole or in part, from time to time in accordance with Section 6.21 .

“ENVIRONMENTAL LAWS” means all international, foreign, federal, state or local laws, statutes, common law duties, rules, regulations, ordinances and codes, together with all administrative or judicial orders, licenses, authorizations and permits of, and agreements with, any governmental authorities, in each case relating to environmental, health, safety and land use and natural resource matters now or hereafter in effect; including, without limitation, the Comprehensive Environmental Response, Compensation and Liability Act of 1980, the Clean Air Act, the Federal Water Pollution Control Act of 1972, the Solid Waste Disposal Act, as amended, the Resource Conservation and Recovery Act, the Toxic Substance Control Act, and

the Emergency Planning and Community Right-to-Know Act, and the Occupational Safety and Health Act, and any analogous state or local laws.

“ERISA” means the Employee Retirement Income Security Act of 1974, as amended from time to time, and the regulations and published interpretations thereof.

“EXISTING AGREEMENT” has the meaning set forth in the recitals to this Agreement.

“FINANCIAL STATEMENTS” means all those balance sheets, income statements and other financial statements of any INDEMNITOR or any AFFILIATE thereof which have been furnished to TRAVELERS for the purpose of or in connection with this Agreement and the transactions contemplated hereby.

“GAAP” is defined as generally accepted accounting principles set forth in the opinions and pronouncements of the Accounting Principles Board and the American Institute of Certified Public Accountants and statements and pronouncements of the Financial Accounting Standards Board.

“INDEMNITOR” means any of HOLDINGS or any SUBSIDIARY of HOLDINGS which is a party to this Agreement as of the date hereof or which becomes a party to this Agreement after the date hereof by hereafter executing and delivering to TRAVELERS a SUPPLEMENTAL SIGNATURE PAGE and INDEMNITORS means, collectively, all of HOLDINGS and all such SUBSIDIARIES of HOLDINGS.

“INTERCREDITOR AGREEMENT” means that certain Intercreditor Agreement dated as of December 22, 2003, by and among GLDD Acquisitions Corp., HOLDINGS, certain

SUBSIDIARIES of HOLDINGS, Bank of America, N.A., as administrative agent, and TRAVELERS, and the documents, instruments and agreements executed and delivered pursuant thereto, as all of the same may be amended, restated, supplemented or otherwise modified from time to time, and any other intercreditor agreement in replacement thereof which is in form and substance acceptable to TRAVELERS.

“LIEN” means any mortgage, deed of trust, pledge, security interest, hypothecation, assignment, deposit arrangement to assure payment of DEBT, encumbrance, lien (statutory or other), charge, or encumbrance of any kind or nature whatsoever (including, without limitation, any conditional sale or other title retention agreement, any financing lease having substantially the same economic effect as any of the foregoing).

“LIMITED SUBSIDIARY” means (a) any SUBSIDIARY which is not an INDEMNITOR and (b) any INDEMNITOR which is not a wholly-owned SUBSIDIARY of HOLDINGS; provided , that North American Site Developers, Inc. shall not be deemed to be a LIMITED SUBSIDIARY for purposes of this Agreement.

“LYDON” means Lydon Dredging & Construction Company, Ltd., a Canadian corporation.

“MATERIAL ADVERSE CHANGE” means a material adverse change in the condition (financial or otherwise), business, operations or prospects of HOLDINGS and its SUBSIDIARIES, taken as a whole.

“MERGER AGREEMENT” means that certain Amended and Restated Agreement and Plan of Merger, dated as of December 22, 2003, among GLDD Acquisitions Corp., a Delaware corporation (“Parent “), GLDD Merger Sub, Inc., a Delaware corporation and a direct wholly-owned subsidiary of Parent, HOLDINGS and, solely in its capacity as Stockholder Representative thereunder and for purposes of Sections 2.8, 2.9, Article VIII and Article IX thereof, Vectura Holding Company LLC.

“NET INCOME” means, for any period, the aggregate of all amounts (exclusive of all amounts in respect of any extraordinary or non-recurring gain or loss (including, without limitation, any write-off of the Chicago Flood litigation insurance receivable)) which, in accordance with GAAP, would be included as net income on a consolidated statement of income of HOLDINGS and its SUBSIDIARIES for such period.

“OBLIGEE” means any named party or parties appearing on the BOND(s) in whose favor the BOND(s) are issued.

“PAYMENT BLOCKAGE NOTICE” has the meaning assigned thereto in the DEBT INDENTURE.

“PERSON” means any entity, whether an individual, trustee, corporation, partnership, joint stock company, limited liability company, unincorporated organization, business association or firm, joint venture, a government or any agent or instrumentality or political subdivision thereof.

“PLAN” means any employee benefit plan (as defined in Section 3(3) of ERISA) established, maintained or to which contributions have been made by any PRINCIPAL.

“PLEDGE AGREEMENT” means a Note Pledge Agreement substantially in the form of Exhibit B hereto, executed by certain of the INDEMNITORS in favor of TRAVELERS, as the same may be amended, restated, supplemented or otherwise modified from time to time.

“PRINCIPAL” means any of HOLDINGS, GLDDC, LYDON, and any other INDEMNITOR for whom TRAVELERS has executed a BOND; and PRINCIPALS means collectively all of the foregoing PERSONS.

“RESTRICTED AMOUNTS” means, as of any date, each of the following: (a) all DEBT and CONTINGENT LIABILITIES of the type described in clause (j) of Section 6.12 outstanding on such date, (b) the fair market value of all assets sold from the date hereof through such date pursuant to the terms of clause (a)(iv)(B) of Section 6.13 , and (c) investments of the type described in clause (e) of Section 6.15 outstanding on such date.

“SECURITY AGREEMENTS” means, collectively, the SECURITY AGREEMENT (A/R) and each SECURITY AGREEMENT (EQUIPMENT).

“SECURITY AGREEMENT (A/R)” means a Security Agreement (A/R) substantially in the form of Exhibit C hereto, executed by the PRINCIPALS (other than LYDON) in favor of TRAVELERS, as the same may be amended, restated, supplemented or otherwise modified from time to time.

“SECURITY AGREEMENT (EQUIPMENT)” means each of the Security Agreement (Equipment) substantially in the form of Exhibit D hereto, executed and delivered by each of GLDDC and HOLDINGS (or any other INDEMNITOR which executes a VESSEL

MORTGAGE after the date hereof) in favor of TRAVELERS, as the same may be amended, restated, supplemented or otherwise modified from time to time.

“SUBORDINATED DEBT” means all DEBT of HOLDINGS issued pursuant to the DEBT INDENTURE.

“SUBSIDIARY” of a PERSON means any corporation, association, partnership, limited liability company, joint venture or other business entity of which more than 50% of the voting stock or other equity interests, is owned or controlled directly or indirectly by such PERSON, or one or more of the SUBSIDIARIES of such PERSON, or a combination thereof. Unless the context otherwise clearly requires, references herein to a “SUBSIDIARY” refer to a SUBSIDIARY of HOLDINGS.

“SUPPLEMENTAL SIGNATURE PAGE” means a supplemental signature page to this Agreement in the form of Exhibit A hereto.

“UNDERWRITING DOCUMENTS” means this Agreement, each of the SECURITY AGREEMENTS, the PLEDGE AGREEMENT, the VESSEL MORTGAGES, each BOND and any other instrument, document or agreement delivered by any INDEMNITOR in connection herewith.

“VESSEL FINANCING AGREEMENT” means that certain Credit Agreement, dated as of December 17, 2003, by and between GLDDC and General Electric Capital Corporation, and the documents, instruments and agreements executed and delivered pursuant thereto, as all of the same may be amended, restated, supplemented or otherwise modified from time to time, and any credit agreement or other agreement or agreements relating to any refinancing, extension, renewal or replacement, in whole or in part, from time to time thereof.

“VESSEL FINANCING COLLATERAL” means, collectively, (i) the Vessels Florida (Official No. 506446), Key West (Official No. 684596) and GL 184 (Official No. 652202), (ii) all insurance and requisition compensation relating to such vessels and any proceeds thereof, and (iii) all charters (other than charters entered into in connection with work being performed on a bonded project) entered into with respect to such vessels having a duration of nine months or more, and the right to receive payments of all sums thereunder.

“VESSEL MORTGAGES” means, collectively, (i) the First Preferred Fleet Mortgage substantially in the form of Exhibit E hereto, executed by GLDDC in favor of TRAVELERS, (ii) the Second Preferred Fleet Mortgage substantially in the form of Exhibit F hereto, executed by GLDDC in favor of TRAVELERS, (iii) the First Preferred Fleet Mortgage substantially in the form of Exhibit E hereto, executed by HOLDINGS in favor of TRAVELERS, (iv) the Second Preferred Fleet Mortgage substantially in the form of Exhibit F hereto, executed by HOLDINGS in favor of TRAVELERS, and (v) any other fleet mortgages or vessel mortgages at any time hereafter executed and delivered by any INDEMNITOR in connection with this Agreement and the other UNDERWRITING DOCUMENTS; in each case as any of the foregoing documents may be amended, restated, supplemented or otherwise modified from time to time.

SECTION 1.2 USE OF DEFINED TERMS. Any collective defined term and any defined term used in the plural shall be taken to encompass all members of the relevant class.

Any defined term used in the singular preceded by “any” shall be taken to indicate any number of the members of the relevant class. A reference to any PERSON shall include all predecessors in interest of such PERSON and any successors or assigns of such PERSON, including successors by way of merger, acquisition or similar event. Any defined term used in the singular and preceded by the word “each” shall indicate all members of the relevant class, individually. A Section or an Exhibit or a Schedule is, unless otherwise stated, a reference to a section hereof or an exhibit or a schedule hereto, as the case may be. The words “hereof,” “herein,” “hereto” and “hereunder” and words of similar import when used in this Agreement shall refer to this Agreement as a whole and not to any particular provision of this Agreement.

SECTION 1.3 ACCOUNTING PRINCIPLES. Unless the context otherwise clearly requires, all accounting terms not expressly defined herein shall be construed, and all financial computations required under this Agreement shall be made, in accordance with GAAP, consistently applied.

SECTION 2.1 BONDS. Subject to the terms of this Agreement, TRAVELERS agrees to provide or procure surety bonds for or on behalf of the PRINCIPALS; provided , that TRAVELERS reserves the right to decline to execute any BOND(s) and if TRAVELERS executes any proposal or bid bond and if any PRINCIPAL is awarded the CONTRACT(s), TRAVELERS shall not be obligated to execute any BOND(s) required to perform the awarded contract. No claim shall be made, nor any cause of action asserted against TRAVELERS as a consequence of its failure to execute any BOND(s).

SECTION 2.2 PREMIUM PAYMENT. Each PRINCIPAL agrees to pay all premiums on the BOND(s) issued for such PRINCIPAL, computed in accordance with the regular manual of rates in effect on the date such BOND(s) are executed; such payments to be made within 45 days of receipt by INDEMNITORS of a statement therefor from TRAVELERS pursuant to the payment directions stated therein or as otherwise agreed to between INDEMNITORS and TRAVELERS. The failure of any PRINCIPAL to pay the bond premiums or the failure of TRAVELERS to receive premiums shall not provide INDEMNITORS with any defense to an action under this Agreement.

SECTION 3.1 INDEMNITY. INDEMNITORS agree to indemnify, and keep indemnified, and hold and save harmless TRAVELERS against all LOSS; provided , that in no event shall any INDEMNITOR indemnify or hold harmless TRAVELERS against any LOSS arising out of the gross negligence, bad faith or willful misconduct of TRAVELERS. The duty of INDEMNITORS to indemnify TRAVELERS is a continuing duty, separate from the duty to exonerate, and survives any payments made in exoneration of TRAVELERS. Amounts due TRAVELERS pursuant to this Section shall be payable within fifteen (15) days of receipt by

INDEMNITORS of written demand therefor. Notwithstanding anything to the contrary herein, any INDEMNITOR which is not a wholly-owned SUBSIDIARY of HOLDINGS (other than North American Site Developers, Inc.) shall indemnify and hold and save TRAVELERS harmless only as to any LOSS incurred by or on behalf of such INDEMNITOR.

SECTION 3.2 EXONERATION. INDEMNITORS recognize and acknowledge the common law right of TRAVELERS to be exonerated by PRINCIPAL for any LOSS arising out of any surety obligation undertaken by TRAVELERS in connection with any BOND, provided , that in no event shall any INDEMNITOR exonerate TRAVELERS for any LOSS arising out of the gross negligence, bad faith or willful misconduct of TRAVELERS. In the event any PRINCIPAL fails or refuses to exonerate TRAVELERS for any LOSS upon written demand therefor, all INDEMNITORS other than such PRINCIPAL agree, upon such demand by TRAVELERS, to exonerate TRAVELERS from LOSS to the same extent such INDEMNITORS agree to indemnify TRAVELERS as provided in Section 3.1 , by satisfying such PRINCIPAL’s obligations under the CONTRACT(s) and obtaining either a withdrawal of all claims against TRAVELERS under the BOND(s) or a general release. Notwithstanding anything to the contrary contained herein, any INDEMNITOR which is not a wholly-owned SUBSIDIARY of HOLDINGS (other than North American Site Developers, Inc.) shall exonerate TRAVELERS only as to BONDS issued for or on behalf of such INDEMNITOR.

SECTION 3.3 CASH COLLATERAL. Upon refusal or failure of any PRINCIPAL to exonerate TRAVELERS in accordance with the terms hereof, INDEMNITORS agree within ten (10) days of demand therefor to deposit with TRAVELERS an amount of money or other collateral of value adequate in the reasonable judgment of TRAVELERS to exonerate TRAVELERS, such funds to be held by TRAVELERS as collateral pursuant to documentation reasonably acceptable to TRAVELERS, with the right to use such funds or any part thereof at any time in payment or compromise of such LOSS, and in which funds INDEMNITORS do hereby grant to TRAVELERS a security interest to secure such LOSS. Unexpended funds by TRAVELERS pursuant to a request for exoneration hereunder shall be repaid to HOLDINGS and its SUBSIDIARIES when the liability of TRAVELERS arising out of the event for which exoneration was requested has been resolved to the reasonable satisfaction of TRAVELERS and TRAVELERS shall have been furnished with full releases of all liability under a surety obligation and have been reimbursed in full for all LOSS. Interest earned (if any) upon funds held by TRAVELERS pursuant to a request for exoneration under this Section which is not otherwise expended in accordance with this Section shall be paid to HOLDINGS and its SUBSIDIARIES.

SECTION 3.4 WAIVER OF CLAIMS AND HOLD HARMLESS. Each INDEMNITOR specifically agrees to protect, indemnify and hold harmless TRAVELERS, each of its officers, directors, employees, agents and its attorneys-in-fact against any and all LOSS that may in any way arise in connection with this Agreement and the other UNDERWRITING DOCUMENTS and the powers herein granted, specifically waiving any claim which any INDEMNITOR has or might hereafter have against TRAVELERS or its attorneys-in-fact on account of anything done in enforcing the terms of this Agreement, the BOND(s) or any other UNDERWRITING DOCUMENT except for any LOSS due to the gross negligence, bad faith, or willful misconduct of TRAVELERS. Until all obligations owing to TRAVELERS hereunder have been paid in full, each INDEMNITOR hereby waives and relinquishes in favor of

TRAVELERS any claim or right to payment that such INDEMNITOR may have or hereafter have or acquire against any PRINCIPAL or other INDEMNITOR by subrogation, indemnification, contribution or otherwise.

SECTION 3.5 WITHDRAWAL FROM AND TERMINATION OF AGREEMENT. (a)Each INDEMNITOR expressly recognizes and covenants this Agreement as its continuing obligation to protect TRAVELERS from all LOSS. Any INDEMNITOR may notify TRAVELERS in writing of such INDEMNITOR’s withdrawal from this Agreement; and such notice shall state when, not less than fifteen (15) days after receipt of such notice by TRAVELERS, such withdrawal shall be effective. Such INDEMNITOR will not be liable under this Agreement as to any BOND(s) executed by TRAVELERS after the effective date of such notice; provided , that as to any and all such BOND(s) executed or authorized by TRAVELERS prior to the effective date of such notice and as to any and all renewals, continuations, extensions, or substitutions (and, if a proposal or bid bond has been executed or authorized prior to such effective date, as to any contract bond executed pursuant thereto) regardless of when the same are executed, such INDEMNITOR shall be and remain fully liable hereunder, as if notice had not been served. Withdrawal by any INDEMNITOR shall in no way affect the obligation of any other INDEMNITOR who has given no notice of termination to TRAVELERS.

(b) HOLDINGS may notify TRAVELERS of the termination of this Agreement by delivering written notice of such termination to TRAVELERS, such termination to be effective on a date specified in such notice which date shall not be less than fifteen (15) days from receipt of such notice; provided , that no such termination shall be effective at any time when any BONDS shall remain outstanding or any obligations under this Agreement shall remain unpaid.

SECTION 3.6 INDEMNITORS AGREE TO BECOME PARTY DEFENDANTS. In the event of legal proceedings against TRAVELERS arising out of this Agreement or the BONDS, TRAVELERS may apply for a court order making any or all of the INDEMNITORS party defendants, and each INDEMNITOR consents to the granting of such application, including consent to the jurisdiction of the court in which the application is made, and agrees to become such a party defendant or third-party defendant and to allow judgment, in the event of judgment against TRAVELERS, to be rendered also against each INDEMNITOR, jointly and severally, in like amount and in favor of TRAVELERS unless such judgment is due to the gross negligence, bad faith or willful misconduct of TRAVELERS.

SECTION 3.7 INDEMNITORS’ WAIVER OF NOTICE. INDEMNITORS waive notice of the execution, continuation, modification, renewal, enlargement or amendment of any BOND and of any fact, act or information concerning or affecting the rights or liabilities of TRAVELERS or INDEMNITORS including, but not limited to, any acts giving rise to any LOSS under the BOND(s).

SECTION 3.8 INDEMNITORS’ KNOWING CONSENT TO AGREEMENT. Each INDEMNITOR warrants that it is specifically and beneficially interested in obtaining the BOND(s) or the forbearance of cancellation of any existing BOND(s). INDEMNITORS acknowledge that the execution of this Agreement and the undertaking of indemnity was not made in reliance upon any representation concerning the responsibility of any INDEMNITOR or concerning the competence of PRINCIPAL to perform. INDEMNITORS agree to make no

claim against TRAVELERS for any oral representations, promises or statements made to any of them by TRAVELERS or any of its agents or brokers, or for the failure of TRAVELERS to disclose facts or information to INDEMNITORS.

SECTION 3.9 INDEMNITORS’ DUTY TO REMAIN INFORMED OF PRINCIPAL’S BUSINESS. INDEMNITORS possess the duty to remain informed of all aspects of each PRINCIPAL’s business and the business activities and financial affairs of each PRINCIPAL. INDEMNITORS acknowledge that they are presently informed of the state of business activities and financial affairs of each PRINCIPAL and all INDEMNITORS. TRAVELERS possesses no obligation to inform any INDEMNITOR of any aspect of any PRINCIPAL’s business or the business activities and financial affairs of the INDEMNITORS or of the request for, or issuance of, any BOND(s).

SECTION 3.10 ENFORCEABILITY OF RIGHTS DIRECTLY AGAINST INDEMNITORS. TRAVELERS shall be entitled to enforce the obligations of this AGREEMENT directly against any INDEMNITOR without the necessity of first proceeding against the PRINCIPAL. The failure of any INDEMNITOR to perform any of the terms of this Agreement or the release of any INDEMNITOR by TRAVELERS shall not excuse or release the remaining INDEMNITORS from their obligations under this Agreement.

SECTION 3.11 ADDITIONAL INDEMNITORS. INDEMNITORS acknowledge that this Agreement can be amended by the execution and delivery of a SUPPLEMENTAL SIGNATURE PAGE to add another PERSON as an INDEMNITOR to this Agreement and INDEMNITORS waive any and all notice in connection with the addition of additional INDEMNITORS, and further acknowledge the rights and obligations provided herein shall apply to all INDEMNITORS whenever made a party to this Agreement.

SECTION 4.1 CONDITION PRECEDENT TO EFFECTIVENESS OF THIS AGREEMENT. The effectiveness of this Agreement is subject to the condition precedent that TRAVELERS shall have received on or before the day hereof each of the following, in form and substance satisfactory to TRAVELERS and its counsel:

SECTION 4.2 CONDITIONS PRECEDENT TO ALL BONDS. The obligation of TRAVELERS to issue any BOND shall be subject to the further conditions precedent that on the date of such issuance:

SECTION 5.1 INCORPORATION, GOOD STANDING, AND DUE QUALIFICATION. HOLDINGS and each SUBSIDIARY: (a) is a corporation or other legal entity duly organized, validly existing and in good standing under the laws of the jurisdiction of its organization; (b) has the organizational power and authority, and has all material governmental licenses, authorizations, consents and approvals, necessary to own its assets and to transact the business in which it is now engaged or proposed to be engaged, except to the extent the failure thereof could not reasonably be expected to have a MATERIAL ADVERSE CHANGE; and (c) is duly qualified as a foreign organization and in good standing under the laws of each other jurisdiction in which such qualification is required except to the extent the

failure to so qualify could not reasonably be expected to name a MATERIAL ADVERSE CHANGE.

SECTION 5.2 CORPORATE POWER AND AUTHORITY. The execution, delivery, and performance by each PRINCIPAL and each INDEMNITOR of the UNDERWRITING DOCUMENTS to which each is a party have been duly authorized by all necessary organizational and stockholder action and do not and will not (a) contravene such party’s organizational documents; (b) violate any provision of any material law, rule, regulation, order, writ, judgment, injunction, decree, determination, or award presently in effect having applicability to such party; (c) result in a breach of or constitute a default under any material indenture or loan or credit agreement or any other material agreement, lease, or instrument to which such party is a party or by which it or its properties may be bound or affected (except where the appropriate consents have been obtained); (d) result in, or require, the creation or imposition of any Lien (except LIENS in favor of TRAVELERS and LIENS arising under the BANK CREDIT FACILITY), upon or with respect to any of the properties now owned or hereafter acquired by such party; or (e) cause such party to be in default under any such law, rule, regulation, order, writ, judgment, injunction, decree, determination, or award or any such indenture, agreement, lease, or instrument (except where the appropriate consents have been obtained).

SECTION 5.3 LEGALLY ENFORCEABLE AGREEMENT. This Agreement is, and each of the other UNDERWRITING DOCUMENTS when delivered under this Agreement will be, legal, valid, and binding obligations of each PRINCIPAL and each INDEMNITOR party thereto, enforceable against such PRINCIPAL or INDEMNITOR, as the case may be, in accordance with their respective terms, except to the extent that such enforcement may be limited by applicable bankruptcy, insolvency, reorganization, moratorium and other similar laws affecting creditors’ rights generally and by equitable principles (regardless of whether enforcement is sought at law or in equity).

SECTION 5.4 APPROVALS. Except for filings and recordings of Liens created pursuant to the SECURITY AGREEMENTS and the VESSEL MORTGAGES, as of the date of this Agreement, no authorizations, approvals or consents of, and no filings or registrations with, any governmental or regulatory authority or agency are necessary for the execution, delivery or performance by each PRINCIPAL and each INDEMNITOR of the UNDERWRITING DOCUMENTS to which each is a party or for the validity or enforceability thereof, other than those which have been heretofore made or obtained.

SECTION 5.5 OWNERSHIP AND LIENS. Each of HOLDINGS and each SUBSIDIARY has title to, or valid leasehold interests in, all of its properties and assets, real and personal, that are necessary for conduct of such Person’s business and none of the material properties and assets owned by HOLDINGS or any SUBSIDIARY and none of their respective material leasehold interests is subject to any LIEN, except such as may be permitted pursuant to Section 6.11 of this Agreement.

SECTION 5.6 TAXES. Each of HOLDINGS and each SUBSIDIARY has filed all material tax returns (federal, state, and local) required to be filed and has paid all taxes, assessments, and governmental charges and levies thereon to be due, including interest and

penalties, except to the extent the validity thereof is being contested in good faith by appropriate proceedings and for which adequate reserves have been set aside on its books in accordance with GAAP.

SECTION 5.7 INSURANCE. As of the date of this Agreement, each PRINCIPAL has insurance in force as disclosed in Schedule 5.7 attached hereto and made a part hereof.

SECTION 5.8 COMPLIANCE. Each of HOLDINGS and each SUBSIDIARY is in material compliance with all statutes and governmental rules and regulations applicable to it, including without limitation, ERISA insofar as ERISA applies to it, except to the extent the failure to be in compliance therewith could not reasonably be expected to have a MATERIAL ADVERSE CHANGE. No condition exists or event or transaction has occurred in connection with any PLAN which could result in any liability, fine or penalty being asserted against HOLDINGS or any SUBSIDIARY, in an aggregate amount in excess of $5,000,000.

SECTION 5.9 LITIGATION. There is no action, suit or proceeding pending against, or to the knowledge of HOLDINGS threatened against or affecting, HOLDINGS or any SUBSIDIARY before any court or arbitrator or any government body, agency or official in which there is a reasonable likelihood of an adverse decision which could reasonably be expected to have a MATERIAL ADVERSE CHANGE or which in any manner draws into question the validity of this Agreement except those referred to in Schedule 5.9 attached hereto and made a part hereof.

SECTION 5.10 SUBSIDIARIES. Schedule 5.10 attached hereto and made a part hereof sets forth a complete and accurate list, as of the date of this Agreement, of each SUBSIDIARY of HOLDINGS and each SUBSIDIARY set forth on Schedule 5.10 and designated with an asterisk (“*”) is a wholly-owned SUBSIDIARY of HOLDINGS.

SECTION 5.11 REAL PROPERTY. Schedule 5.11 contains a complete and accurate list, as of the date of this Agreement, of the address of any real property owned or leased by each PRINCIPAL with a net book value in excess of $750,000.

SECTION 5.12 EQUIPMENT. Schedule 5.12 attached hereto and made a part hereof sets forth a complete and accurate list, as of the date of this Agreement, of each item of equipment with a net book value in excess of $750,000 owned or leased by each PRINCIPAL.

SECTION 5.13 VESSELS. Schedule 5.13 attached hereto and made a part hereof sets forth a complete and accurate list, as of the date of this Agreement, of all vessels owned of record by any PRINCIPAL with a net book value in excess of $750,000 and, except as set forth on Schedule 5.13 , each such vessel has all certificates required under applicable law (except where the failure could not reasonably be expected to have a MATERIAL ADVERSE CHANGE), including, without limitation, certificates of documentation, and, except as set forth on Schedule 5.13 , each such vessel has been certified by the U.S. Coast Guard. Each such certificate is in full force and effect and each such vessel is in seaworthy and operational condition. TRAVELERS has (or will have upon proper filing of the VESSEL MORTGAGES with the U.S. Coast Guard) a perfected security interest, arising pursuant to the VESSEL MORTGAGES, in each vessel set forth on Schedule 5.13 and designated with an asterisk (“*”).

So long as any BONDS shall remain outstanding, HOLDINGS hereby covenants and agrees with TRAVELERS as follows:

SECTION 6.1 CORPORATE EXISTENCE. HOLDINGS will, and will cause each SUBSIDIARY to, maintain its legal existence (in good standing where appropriate under local law) and remain or become duly qualified or licensed (and in good standing where appropriate under local law) as a foreign organization in each jurisdiction in which the conduct of its businesses or location of its assets requires such qualification or license, except where the failure to take any such action could not in the aggregate reasonably be expected to have a MATERIAL ADVERSE CHANGE.

SECTION 6.2 MAINTENANCE OF RECORDS. HOLDINGS will, and will cause each SUBSIDIARY to, keep adequate records and books of account, in which complete entries will be made in accordance with GAAP consistently applied.

SECTION 6.3 MAINTENANCE OF PROPERTIES. HOLDINGS will, and will cause each SUBSIDIARY to, maintain, keep and preserve all of its properties (tangible and intangible) necessary or useful in its business in good working order and condition, ordinary wear and tear and damage caused by casualty excepted.

SECTION 6.4 MAINTENANCE OF INSURANCE. HOLDINGS will, and will cause each SUBSIDIARY to, maintain insurance with financially sound and reputable insurance companies or associations (i) listed on Schedule 6.4 , (ii) that have an A.M. Best policy-holders rating of not less than A, or if no such rating is applicable, that have a quality comparable to those rated A or better, or (iii) as TRAVELERS may reasonably approve, in such amounts and covering such risks as are usually carried by companies engaged in the same or a similar business and similarly situated, which insurance may provide for reasonable deductibility from coverage thereof. HOLDINGS further agrees to furnish TRAVELERS upon written request with an annual report on the insurance in force and with copies of the policies of said insurance evidencing the existence of the coverage called for by this Agreement.

SECTION 6.5 COMPLIANCE WITH LAWS. HOLDINGS will, and will cause each SUBSIDIARY to, comply in all respects with all applicable laws, rules, regulations, and orders the failure to comply with which could reasonably be expected to have a MATERIAL ADVERSE CHANGE, such compliance to include, without limitation, paying before the same become delinquent all material taxes, assessments, and governmental charges imposed upon it or upon its property, except taxes, assessments and governmental charges being contested in good faith by appropriate proceedings and for which adequate reserves have been set aside on its books in accordance with GAAP.

SECTION 6.6 TAXES. HOLDINGS will, and will cause each SUBSIDIARY to, promptly pay all of its material taxes, assessments and other governmental charges prior to the date on which all penalties are attached thereto; provided , that nothing herein contained shall be

interpreted to require the payment of any tax, assessment or charge so long as its validity is being contested in good faith by appropriate proceedings and for which adequate reserves have been set aside on its books in accordance with GAAP.

SECTION 6.7 BOOKS AND RECORDS. Until TRAVELERS shall have been furnished with evidence satisfactory to it that it has been discharged from its obligations under all BONDS without LOSS, upon reasonable prior notice TRAVELERS shall have the right at reasonable times during normal business hours to free access to the books and records of each of HOLDINGS and its SUBSIDIARIES, including, without limitation, its books, records, accounts, computer software and other computer-stored information, for the purpose of examining, copying, or reproducing the same. Following the occurrence and during the continuance of an EVENT OF DEFAULT, each PRINCIPAL authorizes and requests any and all depositories in which funds of such PRINCIPAL may be deposited to furnish to TRAVELERS upon TRAVELERS’s written request statements of its account and any other documents reflecting its receipts and disbursements, and any PERSON doing business with such PRINCIPAL is authorized to furnish any information requested by TRAVELERS concerning any transaction. Subject to Section 8.11 , TRAVELERS may furnish copies of any and all statements, agreements and FINANCIAL STATEMENTS and any information which it now has or may obtain concerning each of HOLDINGS and its SUBSIDIARIES to other PERSONS for the purpose of procuring co-suretyship or reinsurance.

SECTION 6.8 FINANCIAL RECORDS AND REPORTS. HOLDINGS will provide TRAVELERS with copies of yearly audited FINANCIAL STATEMENTS of HOLDINGS and its SUBSIDIARIES on a consolidated basis as soon as possible upon completion and in no event later than ninety (90) days after the end of the period under audit. In addition, HOLDINGS will furnish TRAVELERS with true copies of quarterly unaudited FINANCIAL STATEMENTS of HOLDINGS and its SUBSIDIARIES on a consolidated basis, and such other financial information in a form as TRAVELERS may reasonably request, upon completion and in no event later than forty-five (45) days after the end of each of the first three fiscal quarters of each fiscal year. The FINANCIAL STATEMENTS to be provided by HOLDINGS will be prepared in conformity with GAAP (except, with respect to unaudited FINANCIAL STATEMENTS, for the absence of footnotes and subject to year-end audit adjustments) applied on a basis consistent with that of the preceding fiscal year and in each instance will present fairly and accurately the financial condition of HOLDINGS and its SUBSIDIARIES on a consolidated basis as at the dates of the statements and the results of their operations for the periods then ended. HOLDINGS agrees to promptly notify TRAVELERS of the occurrence of any MATERIAL ADVERSE CHANGE.

SECTION 6.9 PRINCIPALS’ REPRESENTATION. HOLDINGS will provide TRAVELERS on a quarterly basis with a letter in which an AUTHORIZED OFFICER of HOLDINGS represents that to his or her knowledge, as of the date of such quarter end, no condition, event or act exists which constitutes, or which with notice or the lapse of time, or both, would constitute an EVENT OF DEFAULT. This letter shall accompany each delivery of FINANCIAL STATEMENTS required by Section 6.8 hereof.

SECTION 6.10 NOTICE OF LITIGATION. HOLDINGS shall promptly give notice in writing to TRAVELERS of (a) any litigation filed or threatened against HOLDINGS or any of

its SUBSIDIARIES involving an amount in excess of $6,000,000 which claim is not covered by insurance and (b) all litigation filed against any INDEMNITOR associated with any CONTRACT with respect to which five or more separate litigation matters are then pending.

SECTION 6.11 LIENS. HOLDINGS will not, and will not permit any SUBSIDIARY to create, incur, assume, or suffer to exist any LIEN upon any of its properties or assets now owned or hereafter acquired, except for PERMITTED LIENS.

SECTION 6.12 DEBT AND CONTINGENT LIABILITIES. HOLDINGS will not, and will not permit any SUBSIDIARY to, incur, assume, or suffer to exist any DEBT or CONTINGENT LIABILITY, except for:

(a) Except for PERMITTED LIENS, HOLDINGS will not, and will not permit its SUBSIDIARIES to, sell, lease, transfer, or otherwise dispose of its assets whether now owned or hereafter acquired except for

(ii) the sale or other disposition of any investment of the type described in clauses (a) through (e), (h) and (j) of Section 6.15,

(iii) a disposition made in connection with a sale and leaseback transaction involving the sale or disposition of capital assets, provided (A) such sale or disposition is for an amount not less than the fair market value thereof and (B) any DEBT arising in connection therewith is permitted by Section 6.12 ,

(iv) a sale, lease or other disposition that either (A) is made in the ordinary course of business for fair market value, (B) is a sale, lease or transfer from HOLDINGS to any SUBSIDIARY or from a SUBSIDIARY to HOLDINGS or any other SUBSIDIARY; provided , that, in the case of a sale, lease or other disposition by HOLDINGS or any SUBSIDIARY which is not a LIMITED SUBSIDIARY to a LIMITED SUBSIDIARY, the fair market value of such assets, when added to the other RESTRICTED AMOUNTS then outstanding, shall not exceed at any time $30,000,000 or (C) is a lease (on a short-term or long-term basis) to another Person of assets no longer useful or necessary in the operations of businesses of HOLDINGS and its SUBSIDIARIES,

(v) a sale or other disposition of assets no longer useful or necessary in the operations or businesses of HOLDINGS and its SUBSIDIARIES and the purchase price is not less than the fair market value of the asset sold or disposed of,

(vi) a sale or other disposition of accounts receivable arising in the ordinary course of business which are overdue and which HOLDINGS or any SUBSIDIARY have determined are not economical to collect, and

(vii) other dispositions, provided, that such dispositions do not exceed in the aggregate in any fiscal year ten percent (10%) of the book value of all assets.

(b) HOLDINGS further agrees that it shall not permit its SUBSIDIARIES to authorize or issue additional shares of their capital stock or similar equity interest except (i) shares or similar equity interests issued to HOLDINGS or a wholly-owned SUBSIDIARY of HOLDINGS, (ii) shares of capital stock or equity interests issued by (1) any non-wholly owned SUBSIDIARY to its holders of capital stock or equity interests on a proportionate basis and (2) a newly created SUBSIDIARY to another PERSON in connection with any joint venture, provided that such newly created SUBSIDIARY’s business and activities shall be limited to the conduct of such joint venture, (iii) for directors’ qualifying shares and similar issuances pursuant to local law requirements, and (iv) shares of capital stock or equity interests issued by North American Site Developers, Inc. to Persons other than HOLDINGS or a wholly-owned SUBSIDIARY of HOLDINGS, provided , that the aggregate amount of such shares of capital stock or equity interests issued to such Persons shall not exceed twenty-five percent (25%) of the aggregate number of shares of capital stock or equity interests issued by North American Site Developers, Inc.

SECTION 6.14 MERGERS. HOLDINGS will not, and will not permit its SUBSIDIARIES to, merge or consolidate with or into or purchase or otherwise acquire all or substantially all of the assets of, or stock or other equity interest in, any PERSON unless (a) after giving effect to such transaction HOLDINGS shall be in compliance with the provisions of Section 6.19 , and 6.20 and (b) if such transaction involves an INDEMNITOR, the surviving entity shall have executed and delivered to TRAVELERS a SUPPLEMENTAL SIGNATURE PAGE; provided , that (x) any wholly-owned SUBSIDIARY which is an INDEMNITOR may merge or consolidate into HOLDINGS or into or with any other wholly-owned SUBSIDIARY which is an INDEMNITOR, (y) any wholly-owned SUBSIDIARY which is not an INDEMNITOR may merge or consolidate into HOLDINGS or into or with any other wholly-owned SUBSIDIARY, provided , that in the event an INDEMNITOR is a party to such merger or consolidation, an INDEMNITOR must survive the transaction and (z) any wholly-owned SUBSIDIARY may sell, transfer, convey, lease or assign its assets or a substantial part thereof to HOLDINGS or any other wholly-owned SUBSIDIARY, provided , that in the case of a sale, transfer, conveyance, lease or assignment by such a SUBSIDIARY which is an INDEMNITOR, the other party to such transaction must also be an INDEMNITOR. Notwithstanding the foregoing, HOLDINGS and its SUBSIDIARIES may consummate the transactions contemplated by the MERGER AGREEMENT.

SECTION 6.15 INVESTMENTS. HOLDINGS will not, and will not permit its SUBSIDIARIES to, make or suffer to exist any investment in any PERSON whether in the form of equity, DEBT or CONTINGENT LIABILITY, except:

For purposes of this Section 6.15, “Cash Equivalent Investments” means, at any item:

SECTION 6.16 DIVIDEND RESTRICTIONS. HOLDINGS will not pay any dividend or make any other distribution to any PERSON, except:

Notwithstanding the foregoing, HOLDINGS may consummate the transactions contemplated by the MERGER AGREEMENT.

SECTION 6.17 RESTRICTIONS UPON CONTRACTS WITH AFFILIATES. Other than amongst themselves, HOLDINGS and its SUBSIDIARIES will not without the prior written consent of TRAVELERS enter into contracts, equipment leases or other agreements with any AFFILIATE except on an arms’ length basis or except (a) pursuant to written agreements with third-party PERSONS from which HOLDINGS and its SUBSIDIARIES have been or are being benefited, including but not limited to pension plans and other joint employee benefit programs, insurance programs and other similar joint programs or services, (b) the payment by HOLDINGS and its SUBSIDIARIES to Madison Dearborn Partners IV, L.P., or any of its AFFILIATES of

out of pocket costs and expenses owed to PERSONS who are not AFFILIATES, (c) transactions contemplated by the MERGER AGREEMENT, (d) any tax sharing agreement entered into by HOLDINGS or any of its SUBSIDIARIES from time to time, (e) any customary management agreement entered into by HOLDINGS or its SUBSIDIARIES with Madison Dearborn Partners IV, L.P. or any of its AFFILIATES from time to time and (f) the transactions described on Schedule 6.17 .

SECTION 6.18 NATURE OF BUSINESS. HOLDINGS and its SUBSIDIARIES shall not engage in any business activities or operations substantially different from or unrelated to its present business activities and operations; provided , that HOLDINGS and its SUBSIDIARIES may engage in activities that are reasonably related, complimentary or ancillary to its business activities or operations, including, without limitation, the provision of commercial and industrial demolition services.

SECTION 6.19 NET WORTH. HOLDINGS and its consolidated SUBSIDIARIES shall not permit NET WORTH as of the last day of any fiscal quarter of HOLDINGS ending after the date hereof, to be less than the sum of (i) $90,000,000 plus (ii) fifty percent (50%) of the sum of the positive NET INCOME (if any) for the fiscal quarter of HOLDINGS ending on or about December 31, 2003, plus (iii) fifty percent (50%) of the sum of the positive NET INCOME (if any) for each fiscal year of HOLDINGS ending on or after December 31, 2004 and prior to the date of determination hereunder.

SECTION 6.20 NET CURRENT ASSETS. HOLDINGS will not permit the ratio of its consolidated current assets to its consolidated current liabilities as of the last day of each fiscal quarter of HOLDINGS to be less than 1.2 to 1 and will not permit its net current assets as of the last day of each fiscal quarter of HOLDINGS to be less than $17,000,000; provided , that in the event HOLDINGS fails to maintain either of these levels it shall immediately notify TRAVELERS and shall have thirty (30) days in which to restore its position. In the determination of current assets, pipe inventory shall be classified as a current asset; and provided further , that for purposes of calculating consolidated current liabilities, current maturities of DEBT will be excluded from the calculation thereof to the extent HOLDINGS or any of its SUBSIDIARIES is able to repay such current maturities through the incurrence of other non-current DEBT (including, without limitation, through borrowings under the BANK LOAN FACILITY).

(a) HOLDINGS shall not, and shall not suffer or permit any of its SUBSIDIARIES to, (i) make any payment (other than any payment utilizing proceeds from the issuance of any equity securities by HOLDINGS or any parent entity) of interest on any SUBORDINATED DEBT on any day other than the stated, scheduled date (subject to any applicable grace period) for such payment set forth in the document or agreement evidencing or governing such SUBORDINATED DEBT, (ii) make any voluntary or mandatory prepayment (other than any payment utilizing proceeds from the issuance of any equity securities by HOLDINGS or any parent entity) of principal of, or redeem, purchase or defease, any SUBORDINATED DEBT, or (iii) consent to any amendment, supplement or other modification of any of the terms or provisions contained in, or applicable to, any document or agreement evidencing or governing

SUBORDINATED DEBT, except to the extent that such amendment, supplement or other modification would extend the date or reduce the amount of any required repayment or redemption or would amend, supplement or modify any term or provision in a manner not adverse to the rights or interests of TRAVELERS. Notwithstanding the foregoing, (i) TRAVELERS hereby consents to HOLDINGS making a voluntary prepayment of, redeeming or repurchasing all of the principal and accrued and unpaid interest, together with any premium and fees in connection with such prepayment, redemption or repurchase, on the senior subordinated notes issued pursuant to the 1998 DEBT INDENTURE (as defined in the EXISTING AGREEMENT) and (ii) HOLDINGS and its SUBSIDIARIES shall be permitted to refinance the SUBORDINATED DEBT from time to time pursuant to a note indenture or other agreement containing covenants, events of default and other terms not materially more restrictive than those set forth in the DEBT INDENTURE.

(b) HOLDINGS shall promptly give notice in writing to TRAVELERS of the receipt by the Trustee under the DEBT INDENTURE of any PAYMENT BLOCKAGE NOTICE.

SECTION 6.22 CHANGE OF LOCATION OR NAME. None of the INDEMNITORS shall change (i) the location of its principal place of business or chief executive office, or (ii) its name or the name under which it conducts business or its jurisdiction of organization, in each case without giving TRAVELERS written notice thereof promptly upon the effectiveness of such change (and in any event no later than 30 days after the effectiveness of such change) and taking all actions reasonably requested by TRAVELERS to maintain and preserve all LIENS in favor of TRAVELERS granted pursuant to the UNDERWRITING DOCUMENTS.

SECTION 7.1 FURTHER ASSURANCES/TRAVELERS AS ATTORNEY-IN-FACT. PRINCIPALS agree to sign, execute, file and/or deliver to TRAVELERS all documents, reports, papers, pleadings and/or instruments reasonably requested by TRAVELERS to obtain, and/or perfect any of TRAVELERS’s rights under this Agreement. The INDEMNITORS irrevocably nominate and appoint TRAVELERS or any other PERSON(s) designated by TRAVELERS, effective upon the occurrence and during the continuance of an EVENT OF DEFAULT, true and lawful attorney-in-fact of the INDEMNITORS, with full right and authority, upon the occurrence and during the continuance of an EVENT OF DEFAULT to execute on behalf of, and sign the names of each INDEMNITOR to any voucher, release, satisfaction, check, application for payment, bill of sale of any or all property assigned by this Agreement or any other UNDERWRITING DOCUMENT to TRAVELERS or any other paper or contract necessary or desired to carry into effect the purposes of this Agreement or any other UNDERWRITING DOCUMENT, with full right and authority, to satisfy the performance of the CONTRACT(s); and each INDEMNITOR ratifies and confirms all that such attorney-in-fact or TRAVELERS may lawfully do in the premises and further authorizes and empowers TRAVELERS and such attorney-in-fact and each of them to enter upon and take possession of the tools, plant, equipment, materials and subcontracts and all other collateral security mentioned in this Agreement and enforce, use, employ and dispose thereof for the purposes set forth in this

Agreement, INDEMNITORS recognize that the appointment of such attorney-in-fact constitutes a power coupled with an interest.

SECTION 7.2 CONTRACT FUNDS HELD IN TRUST. INDEMNITORS and PRINCIPALS agree and expressly declare that upon the occurrence and during the continuance of an EVENT OF DEFAULT all funds due or to become due under the CONTRACT(s) will immediately become trust funds, whether in possession of INDEMNITORS, PRINCIPALS or another, for the benefit and the payment of all PERSONS to whom a PRINCIPAL incurs obligations in the performance of the CONTRACT(s), for which TRAVELERS would be liable under the BOND(s). If TRAVELERS discharges any such obligations, with or without a claim asserted against TRAVELERS under the BOND(s), it shall be entitled to assert the right of such PERSON to the trust fund.

SECTION 7.3 RIGHT OF TRAVELERS TO SETTLE CLAIMS. TRAVELERS shall have the exclusive right for itself and for INDEMNITORS and PRINCIPALS to decide and determine whether any claim, demand, suit or judgment on the BOND(s) shall be paid, settled, defended or appealed. Any payment or determination made by TRAVELERS under a good faith belief that either TRAVELERS was or might be liable therefor or such payments were necessary or advisable to protect any of TRAVELERS’s rights or to avoid or lessen TRAVELERS’s liability or alleged liability, shall be final, conclusive and binding upon INDEMNITORS and the PRINCIPALS; and any LOSS which may be sustained or incurred shall be paid by the respective PRINCIPAL or by INDEMNITORS within fifteen (15) days of receipt of written demand by TRAVELERS. In the event of any payment, settlement, compromise, or investigation, an itemized statement of LOSS sworn to by an officer or authorized representative of TRAVELERS or voucher(s) or other evidence of such LOSS shall be prima facie evidence of the fact and extent of the liability of INDEMNITORS and the PRINCIPALS to TRAVELERS in any claim or suit and in any and all matters arising between INDEMNITORS, the PRINCIPALS and TRAVELERS.

SECTION 7.4 AUTHORITY OF TRAVELERS TO MAKE LOANS TO PRINCIPAL. In addition to the other remedies provided herein, TRAVELERS is authorized and empowered, but is not obligated, to advance or loan money or guarantee loans to any PRINCIPAL as TRAVELERS may see fit for the purpose of any of the CONTRACT(s), or for the purpose of meeting operational expenses or paying other obligations, bonded or unbonded. Such funds may be advanced or guaranteed at anytime, whether before or after default of such PRINCIPAL under the CONTRACT(s). Upon demand by TRAVELERS, each INDEMNITOR shall be responsible to reimburse TRAVELERS for all funds so loaned, advanced, or guaranteed and all LOSS incurred by TRAVELERS in relation thereto, notwithstanding the failure of any PRINCIPAL to so use those funds. INDEMNITORS waive all notice of such advance, loan, or guarantee.

SECTION 7.5 AUTHORITY OF TRAVELERS TO AMEND BOND. TRAVELERS shall have the right, and is hereby authorized and empowered, but not required: (a) upon the request of any INDEMNITOR to increase or decrease the penalty or penalties of any BOND(s), to change the OBLIGEE(s) therein, to execute any continuation, enlargements, modifications and renewals thereof or substitute therefor with the same or different conditions, provisions or OBLIGEE(s), and with the same, larger or smaller penalties, it being agreed that this instrument shall apply to and cover such new or changed BOND(s) or renewals even though the consent of

TRAVELERS may or does substantially increase the liability of the INDEMNITORS and the PRINCIPALS; or (b) to take such steps as it may deem necessary or proper to obtain release from liability under the BOND(s); or (c) to assent to any changes in any CONTRACT, including but not limited to, any change in the time for completion of any CONTRACT and to payments or advances thereunder.

SECTION 7.6 RIGHTS OF TRAVELERS TO TAKE POSSESSION OF THE WORK. Upon the occurrence and during the continuance of an EVENT OF DEFAULT (for the avoidance of doubt, after giving effect to all applicable grace periods contained in the definition of EVENT OF DEFAULT), in addition to other remedies provided herein, TRAVELERS is authorized and empowered, but is not obligated, to take possession of the work under any CONTRACT(s) and at the expense of the respective PRINCIPAL and of INDEMNITORS to complete or to contract for the completion of the same, or to consent to the reletting of the completion thereof by OBLIGEE, or to take such other steps as in the discretion of TRAVELERS may be advisable or necessary to obtain its release or to avoid LOSS.

SECTION 7.7 DEPOSITORY TRUST ACCOUNTS. Upon the occurrence and during the continuance of an EVENT OF DEFAULT (for the avoidance of doubt, after giving effect to all applicable grace periods contained in the definition of EVENT OF DEFAULT), PRINCIPALS shall, upon demand of TRAVELERS, open an account(s) with a bank or similar depository designated by PRINCIPALS and approved by TRAVELERS, which account(s) shall be designated as trust account(s) for the deposit of such trust funds, and shall deposit therein all monies paid or to be paid under the CONTRACT(s). Withdrawals from such account(s) shall be by check or similar instruments signed by a representative of TRAVELERS and, at TRAVELERS’s option, countersigned by a PRINCIPAL. Said trust(s) shall terminate on the payment by INDEMNITORS and PRINCIPALS of all the contractual obligations for the payment of which the trust(s) are created or upon the expiration of seven (7) years from the date thereof, whichever shall first occur.

SECTION 7.8 PRESERVATION OF TRAVELERS’S RIGHTS. TRAVELERS shall have every right and remedy which a personal surety without compensation would have, including the right to secure its discharge from the suretyship, and nothing in this Agreement shall waive, abridge or diminish any right which TRAVELERS might have if this Agreement were not executed.

SECTION 7.9 AUTHORITY OF TRAVELERS TO ELECT REMEDIES. Each right, remedy and power of TRAVELERS provided in this Agreement or by law, equity, or statute shall be cumulative, and the exercise by TRAVELERS of any right, remedy or power shall not preclude TRAVELERS’s simultaneous or subsequent exercise of any or all other rights, powers or remedies. The failure or delay by TRAVELERS to exercise any right, power or remedy shall not waive any right, power or remedy. No notice or demand upon TRAVELERS by any INDEMNITOR or any PRINCIPAL shall limit or impair TRAVELERS’s right to take any action under this Agreement or to exercise any right, power or remedy, subject to the provisions of Section 3.5 herein.

SECTION 8.1 BENEFICIAL PARTIES. This Agreement shall, in all its terms and agreements, be for the benefit of and protect any PERSON joining with TRAVELERS in executing any BOND or BONDS or executing at the request of TRAVELERS said BOND or BONDS as well as any PERSON assuming co-suretyship or reinsurance thereupon.

SECTION 8.2 JOINT AND SEVERAL. The agreements and covenants herein contained shall be binding upon the undersigned, both jointly and severally, upon their successors and assigns jointly and severally, provided , that the PRINCIPALS and the INDEMNITORS may not assign their rights hereunder without the prior written consent of TRAVELERS.

SECTION 8.3 ATTORNEYS FEES. The INDEMNITORS agree hereby to pay the reasonable attorneys fees and expenses incurred by TRAVELERS in the preparation and enforcement of this Agreement and the other UNDERWRITING DOCUMENTS.

SECTION 8.4 APPLICABLE LAW. The terms and conditions of this Agreement shall be construed under the laws of New York without regard to its conflicts of laws principles (other than the provisions of 5-1401 and 5-1402 of the New York General Obligations Law).

SECTION 8.5 JURISDICTION FOR SUITS UNDER THIS AGREEMENT. Separate suits may be brought hereunder as causes of action may accrue, and the pendency or termination of any such suit shall not bar any action, whether previously or subsequently arising. PRINCIPALS and INDEMNITORS consent to the jurisdiction of the state and federal court located in Hartford, CT to bring any action against them under this Agreement or the BOND(s). Each PRINCIPAL and each INDEMNITOR are the agents for all PRINCIPALS and all INDEMNITORS for the purpose of accepting service of process.

SECTION 8.6 INDEMNITORS WAIVE DEFENSE OF SUBSEQUENT EXECUTION. INDEMNITORS waive any defense that this Agreement was executed subsequent to any BOND, admitting that such BOND was executed pursuant to each INDEMNITOR’s request and in reliance upon INDEMNITORS’ promise to execute this Agreement.

SECTION 8.7 VALIDITY OF AGREEMENT. Failure to execute, or defective execution, by any party shall not affect the validity of this Agreement as to any other party executing the same, and each other party shall remain fully bound and liable hereunder. Invalidity of any portion or provision of this Agreement by reason of the laws of any state or for any other reason shall not render the other provisions or portions invalid. Executions of any application or submission for any BOND by any PRINCIPAL, or of any other indemnity agreement by any INDEMNITOR for the PRINCIPALS shall not abrogate, waive or diminish any rights of TRAVELERS under this Agreement. This Agreement may be executed simultaneously in one or more counterparts, each of which shall be an original, but all of which together shall constitute one and the same instrument.

SECTION 8.8 ORAL MODIFICATIONS INEFFECTIVE. This Agreement may not be changed or modified orally. No change or modification to this Agreement shall be effective unless specifically agreed to in writing and executed by TRAVELERS and HOLDINGS.

SECTION 8.9 NOTICES. It is mutually agreed that any and all notices or demands herein provided for must be given in writing and shall be deemed given if and when delivered in person or duly deposited in the United States mails, postage prepaid for regular or certified mail, properly addressed to the party to whom given at the address of such party shown in this Agreement; provided , that any party may specify any other post office address in the United States by giving at least ten (10) days written notice thereof to the other party.

SECTION 8.10 REAFFIRMATION AND RESTATEMENT. This Agreement constitutes an amendment and restatement of the EXISTING AGREEMENT and the DEBT evidenced by the EXISTING AGREEMENT is continuing DEBT. Nothing herein shall be

deemed to constitute a payment, settlement or novation of the DEBT evidenced by the EXISTING AGREEMENT, or to release or otherwise adversely affect any LIEN securing such DEBT or any rights TRAVELERS has against any guarantor, surety or other party primarily or secondarily liable for such DEBT.

SECTION 8.11 CONFIDENTIALITY. TRAVELERS agrees that they will maintain the confidentiality of any written or oral information provided to TRAVELERS by or on behalf of HOLDINGS or any of its SUBSIDIARIES (hereinafter collectively called “Confidential Information”), subject to TRAVELERS’s (a) obligation to disclose any such Confidential Information pursuant to a request or order under applicable laws and regulations or pursuant to a subpoena or other legal process, (b) right to disclose any such Confidential Information to its examiners, auditors, counsel and other professional advisors, (c) right to disclose any such Confidential Information in connection with any litigation or dispute involving TRAVELERS and HOLDINGS or any of its SUBSIDIARIES, (d) right to provide such information to other Persons for the purpose of procuring co-suretyship or reinsurance if such Person agrees in writing to maintain the confidentiality of such information on terms substantially similar to those of this Section as if it were a party hereto. Notwithstanding the foregoing, any such information supplied to TRAVELERS or another Person under this Agreement shall cease to be Confidential Information if it is or becomes known to such Person by other than unauthorized disclosure, or if it becomes a matter of public knowledge.

SECTION 8.12 RELEASE OF LIENS. TRAVELERS agrees to release the LIENS under the SECURITY AGREEMENTS, the VESSEL MORTGAGES, and any other UNDERWRITING DOCUMENTS, and to execute and deliver such documents and instruments requested by any PRINCIPAL to effect such release;

SECTION 8.13 SUCCESSORS AND ASSIGNS. This Agreement shall be binding upon and inure to the benefit of the INDEMNITORS and TRAVELERS and their respective successors and assigns (including successors by way of merger, acquisition or similar event).

IN WITNESS WHEREOF, this Agreement is executed by the parties on the day and date first set forth above.


GREAT LAKES DREDGE & DOCK CORPORATION

By:	/s/ Deborah A. Wensel
	Name:	Deborah A. Wensel
	Title:	Senior Vice President, Chief Financial
		Officer and Treasurer

GREAT LAKES DREDGE & DOCK COMPANY

By:	/s/ Deborah A. Wensel
	Name:	Deborah A. Wensel
	Title:	Senior Vice President, Chief Financial
		Officer and Treasurer

LYDON DREDGING & CONSTRUCTION COMPANY, LTD.

By:	/s/ Deborah A. Wensel
	Name:	Deborah A. Wensel
	Title:	Vice President

FIFTY-THREE DREDGING CORPORATION

By:	/s/ Deborah A. Wensel
	Name:	Deborah A. Wensel
	Title:	Vice President

DAWSON MARINE SERVICES COMPANY

By:	/s/ Deborah A. Wensel
	Name:	Deborah A. Wensel
	Title:	Senior Vice President, Chief Financial
		Officer and Treasurer


GREAT LAKES CARIBBEAN DREDGING, INC.

By:	/s/ Deborah A. Wensel
	Name:	Deborah A. Wensel
	Title:	Senior Vice President, Chief Financial
		Officer and Treasurer

NORTH AMERICAN SITE DEVELOPERS, INC.

By:	/s/ Deborah A. Wensel
	Name:	Deborah A. Wensel
	Title:	Vice President and Treasurer


TRAVELERS CASUALTY AND SURETY COMPANY

By:	/s/ Michael Damewood
	Name:	Michael Damewood
	Title:	Attorney-in-Fact

TRAVELERS CASUALTY AND SURETY COMPANY

By:	/s/ Michael Damewood
	Name:	Michael Damewood
	Title:	Attorney-in-Fact

Reference is made to that certain Third Amended and Restated Underwriting and Continuing Indemnity Agreement (as amended, modified or supplemented from time to time, the “Agreement”), dated December , 2003, among Great Lakes Dredge & Dock Corporation, certain of its subsidiaries, Travelers Casualty and Surety Company (as assignee of Reliance Insurance Company, United Pacific Insurance Company, Reliance National Insurance Company and Reliance Surety Company) (“Travelers”) and Travelers Casualty and Surety Company of America (“TCSCA” and, together with Travelers, collectively, the “Sureties”). Capitalized terms used and not otherwise defined herein have the meanings assigned to them in the Agreement.

By executing and delivering this Supplemental Signature Page, the undersigned hereby becomes a party to the Agreement as an Indemnitor thereunder with the same force and effect as if originally named as an Indemnitor therein and expressly assumes all obligations and liabilities of an Indemnitor thereunder.

The undersigned hereby represents and warrants that each of the representations and warranties contained in Article V of the Agreement applicable to it is true and correct on and as of the date hereof as if made on and as of such date.

IN WITNESS WHEREOF, the undersigned has caused this Supplemental Signature Page to be duly executed and delivered as of the date first above written.

This FOURTH AMENDED AND RESTATED NOTE PLEDGE AGREEMENT (this “Agreement”) is made and entered into as of December 22, 2003 by GREAT LAKES DREDGE & DOCK CORPORATION, a Delaware corporation, (“Great Lakes”), and each other entity a signatory hereto or which becomes a party hereto pursuant to Section 25 (collectively with Great Lakes, the “Grantors” and each, individually, a “Grantor”), in favor of TRAVELERS CASUALTY AND SURETY COMPANY, a Connecticut corporation (as assignee of Reliance Insurance Company, a Pennsylvania corporation, United Pacific Insurance Company, a Pennsylvania corporation, Reliance National Insurance Company, a Delaware corporation, and Reliance Surety Company, a Delaware corporation) (“TCASC”) and TRAVELERS CASUALTY AND SURETY COMPANY OF AMERICA, a Connecticut corporation (“Travelers America” and together with TCASC, the “Secured Party”).

A. Concurrently herewith, the Grantors, certain of their affiliates and the Secured Party are entering into that certain Third Amended and Restated Underwriting and Continuing Indemnity Agreement, dated as of even date herewith, which amends and restates that certain Second Amended and Restated Underwriting and Continuing Indemnity Agreement, dated as of August 19, 1998, as amended, supplemented or otherwise modified from time to time (as it may be further amended, restated, supplemented or otherwise modified from time to time, the “Underwriting Agreement”). Capitalized terms used herein and not otherwise defined herein shall have the meaning given in the Underwriting Agreement.

B. The Grantors have previously entered into that certain Third Amended and Restated Note Pledge Agreement (the “Existing Agreement”), dated as of April 24, 2001, in favor of the Secured Party.

C. The Grantors and the Secured Party desire to amend and restate the Existing Agreement on the terms and conditions set forth in this Agreement.

NOW, THEREFORE, in consideration of the premises set forth herein and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto agree as follows:

1. Defined Terms. Unless otherwise defined herein, terms defined in the Underwriting Agreement are used herein as therein defined, and the following terms shall have the following meanings (such meanings being equally applicable to both the singular and the plural forms of the terms defined):

“Collateral” shall mean all property and rights in property now owned or hereafter at any time acquired by any Grantor with respect to which a Lien is granted in favor of the Secured Party by such Grantor under this Agreement pursuant to Section 2.

“Note” shall mean that certain Third Amended and Restated Master Intercompany Demand Note dated as of the date hereof executed and delivered by the Grantors and certain of their other Affiliates, as the same may be amended, restated, extended, supplemented or otherwise modified.

“UCC” shall mean the Uniform Commercial Code, as the same may, from time to time, be in effect in the State of New York; provided, however, in the event that, by reason of mandatory provisions of law, any or all of the attachment, perfection or priority of the Secured Party’s security interest in any Collateral is governed by the Uniform Commercial Code as in effect in a jurisdiction other than the State of New York, the term “UCC” shall mean the Uniform Commercial Code as in effect from time to time in such other jurisdiction for purposes of the provisions hereof relating to such attachment, perfection or priority and for purposes of definitions related to such provisions.

2. Grant of Security. To secure the prompt and complete payment, observance and performance of (a) each Grantor’s obligations and liabilities under the Underwriting Agreement and the other Underwriting Documents, including, without limitation, all “Loss” under and as defined in the Underwriting Agreement and (b) each Grantor’s obligations and liabilities under this Agreement and other agreements, documents or instruments executed by such Grantor pursuant to or in connection with such agreements (all such obligations and liabilities of the Grantors now or hereafter existing being hereinafter referred to as the “Liabilities”), each Grantor hereby reaffirms its assignment, pledge and grant pursuant to the Existing Agreement, and each Grantor hereby presently assigns, grants and pledges, to the Secured Party, for the benefit of each Secured Party, a security interest in all of such Grantor’s right, title and interest in and to the following, whether now owned or existing or hereafter arising or acquired and wheresoever located: the Note, all other amounts from time to time owing to such Grantor from any other Indemnitor (whether or not evidenced or governed by the Note), all proceeds of any of the foregoing, and all books and records with respect thereto.

3. Grantors Remain Liable. Anything herein to the contrary notwithstanding, (a) each Grantor shall remain liable under the Note to which it is a party to perform all of its duties and obligations thereunder to the same extent as if this Agreement had not been executed, (b) the exercise by the Secured Party of any of its rights hereunder shall not release such Grantor from any of its duties or obligations under the Note to which it is a party or with respect to any other Collateral, and (c) the Secured Party shall not have any responsibility, obligation or liability under any Note or other Collateral by reason of this Agreement, nor shall the Secured Party be required or obligated, in any manner, to (i) perform or fulfill any of the obligations or duties of such Grantor thereunder, (ii) make any payment, or make any inquiry as to the nature or sufficiency of any payment received by such Grantor or the sufficiency of any performance by any party under any such contract or agreement or (iii) present or file any claim, or take any action to collect or enforce any claim for payment assigned hereunder.

4. Representations and Warranties. Each Grantor represents and warrants, as of the date of this Agreement and on the date of the issuance of any Bond (unless such representation speaks only as of the date hereof and except as otherwise permitted by this Agreement or the Underwriting Agreement) until the termination of this Agreement pursuant to Section 15, that:

(a) The correct legal corporate names of the Grantors are set forth on the signature pages to this Agreement and the jurisdictions of organization of the Grantors are set forth on Schedule I. The chief place of business and chief executive office of the Grantors (other than North American Site Developers, Inc. (“NASDI”)), is located at 2122 York Road, Oak Brook, Illinois 60523, and the chief place of business and chief executive office of NASDI is located at 218 Lincoln Street, Allston, Massachusetts 02134. All records included within or otherwise concerning the Collateral (other than the Note itself) are located at such addresses.

(b) Each Grantor is the legal and beneficial owner of its respective Collateral free and clear of all Liens, except for Liens permitted by the Underwriting Agreement (“Permitted Liens”).

(c) Each Grantor conducts business under its legal corporate name and, within the five-year period preceding the date hereof, the Grantors have not used any trade names or fictitious names, except as set forth on Schedule I.

(d) This Agreement creates in favor of the Secured Party a legal, valid and enforceable security interest in all Collateral. When the Note is delivered to the Secured Party, endorsed as payable to the order of the Secured Party as contemplated on the face of such Note and financing statements against each applicable Grantor have been properly presented for filing and the filing fee has been tendered or have been accepted by the filing officers in the Secretaries of State of Delaware, Illinois, Massachusetts and New Jersey, as applicable, the Secured Party will have a fully perfected first priority lien on, and security interest in, the Collateral, subject only to Permitted Liens.

(e) No authorization, approval or other action by, and no notice to or filing with, any governmental authority or regulatory body that has not already been taken or made and which is in full force and effect, is required (i) for the grant by the Grantor of the security interest in the Collateral granted hereby; (ii) for the execution, delivery or performance of this Agreement by the Grantors; or (iii) for the exercise by the Secured Party of any of its other rights or remedies hereunder, except those for which, if not obtained, could not reasonably be expected to have a Material Adverse Change.

(f) Each Note has been duly authorized, executed, endorsed, issued and delivered, and evidences the legal, valid and binding obligation of each “Borrower” under and as defined therein (except as such enforceability may be limited by applicable bankruptcy, reorganization, insolvency and other similar laws affecting creditors’ rights generally), and no default exists under such Note by any such “Borrower”.

5. Perfection and Maintenance of Security Interest and Lien. It is acknowledged by all the parties hereto that as of the date hereof, Bank of America, N.A. (the “Bank Agent”) is in possession of the Note pursuant to that certain Note Pledge Agreement of even date herewith among the Grantors and the Bank Agent. At such time as the Bank Agent shall relinquish possession of the Note (the “Turn-Over Date”), the Grantors shall cause such Note to be delivered to the Secured Party and to be properly endorsed by each applicable Grantor as payable to the order of the Secured Party. Each Grantor agrees that until such time as no Bonds shall remain outstanding and all of the Liabilities have been fully satisfied, this

Agreement and the security interests and Liens created hereby shall continue in full force and effect. Each Grantor shall perform any and all steps reasonably requested by the Secured Party to perfect, maintain and protect the Secured Party’s security interests in and Liens on and against the Collateral granted or purported to be granted hereby or to enable the Secured Party to exercise its rights and remedies hereunder with respect to any Collateral, including, without limitation, executing and filing financing or continuation statements, or original financing statements in lieu of continuation statements, or amendments thereof, in form and substance reasonably satisfactory to the Secured Party and executing and delivering all further instruments and documents, and taking all further action, as the Secured Party may reasonably request (provided, that prior to the Turn-Over Date, the Grantors shall not be required to deliver to the Secured Party the original Note), including, without limitation, in order to preserve, protect and enforce the security interests in and Liens on and against the Collateral granted or purported to be granted hereby under the law of any jurisdiction in the event for any reason that the law of such jurisdiction becomes or is applicable to the Collateral or any part thereof.

6. Financing Statements. To the extent permitted by applicable law, each Grantor hereby authorizes the Secured Party to file financing or continuation statements, original financing statements in lieu of continuation statements, and amendments thereto disclosing the security interest granted to the Secured Party under this Agreement without such Grantor’s signature appearing thereon, and the Secured Party agrees to notify such Grantor when such a filing has been made. If any Collateral is in the possession or control of any third party, upon the Secured Party’s request, each Grantor shall notify such Person of the Secured Party’s security interest in such Collateral and, upon the Secured Party’s request, instruct them to hold all such Collateral for the Secured Party’s account and subject to the Secured Party’s instructions and to obtain an acknowledgement from such Person that such Person is holding such Collateral for the benefit of the Secured Party.

7. Filing Costs. The Grantors shall pay the costs of, or incidental to, all recordings or filings of all financing statements, including, without limitation, any filing expenses incurred by the Secured Party pursuant to Section 6.

8. Secured Party Appointed Attorney-in-Fact. Each Grantor hereby irrevocably appoints the Secured Party as such Grantor’s attorney-in-fact, with full authority in the place and stead of such Grantor and in such Grantor’s name or otherwise, from time to time in the Secured Party’s discretion, to take any action and to execute any instrument which the Secured Party may deem necessary or advisable to accomplish the purposes of this Agreement, including, without limitation, following the occurrence and during the continuance of an Event of Default, to (a) ask, demand, collect, sue for, recover, compromise, receive and give acquittance and receipts for moneys due and to become due under or in respect of any of the Collateral, including, without limitation, to demand repayment of all amounts owing to one or more Grantors under the terms of the Note; (b) receive, endorse, and collect any drafts or other instruments, documents and chattel paper, in connection with clause (a) above; and (c) file any claims or take any action or institute any proceedings that the Secured Party may deem necessary or desirable for the collection of any of the Collateral, or otherwise to enforce the rights of the Secured Party with respect to any of the Collateral.

9. Secured Party’s Duties. The powers conferred on the Secured Party hereunder are solely to protect its interest in the Collateral and shall not impose any duty upon it to exercise any such powers. Except for the safe custody of any Collateral in its possession and the accounting for moneys actually received by it hereunder, the Secured Party shall not have any duty as to any Collateral. The Secured Party shall be deemed to have exercised reasonable care in the custody and preservation of the Collateral in its possession if the Collateral is accorded treatment substantially equal to that which the Secured Party accords its own property, it being understood that the Secured Party shall be under no obligation to take any necessary steps to preserve rights against prior parties or any other rights pertaining to any Collateral, but may do so at its option, and all reasonable expenses incurred in connection therewith shall be for the sole account of the Grantors and shall be added to the Liabilities.

10. Remedies. (a) If any Event of Default shall have occurred and be continuing:

(i) The Secured Party shall have, in addition to other rights and remedies provided for herein or otherwise available to it, all the rights and remedies of a secured party upon default under the UCC (whether or not the UCC applies to the affected Collateral) and further, the Secured Party may, without notice, demand or legal process of any kind (except as may be required by law), all of which each Grantor waives, at any time or times, (x) enter any Grantor’s owned or leased premises and take physical possession of the Collateral and maintain such possession on such Grantor’s owned or leased premises, at no cost to the Secured Party or remove the Collateral, or any part thereof, to such other place(s) as the Secured Party may desire, (y) require each Grantor to, and each Grantor hereby agrees that it will, at its expense and upon request of the Secured Party, forthwith assemble all or any part of the Collateral as the Secured Party directs and make it available to the Secured Party at a place to be designated by the Secured Party that is reasonably convenient to the Secured Party and (z) without notice except as specified below, sell, lease, assign, grant an option or options to purchase or otherwise dispose of the Collateral or any part thereof at public or private sale, at any exchange, broker’s board or at any of the offices of the Secured Party or elsewhere, for cash, on credit or for future delivery, and upon such other terms as the Secured Party may deem commercially reasonable. Each Grantor agrees that, to the extent notice of sale shall be required by law, at least ten (10) days’ notice to such Grantor of the time and place of any public sale or the time after which any private sale is to be made shall constitute reasonable notification. The Secured Party shall not be obligated to make any sale of Collateral regardless of notice of sale having been given. The Secured Party may adjourn any public or private sale from time to time by announcement at the time and place fixed therefor, and such sale may, without further notice, be made at the time and place to which it was so adjourned;

(ii) The Secured Party shall apply all cash proceeds received by the Secured Party in respect of any sale of, collection from, or other realization upon all or any part of the Collateral (after payment of all expenses incurred by the Secured Party in connection with such sale, collection or realization), against all or any part of the Liabilities in such order as may be required by the Secured Party. Any surplus of such cash or cash proceeds held by the Secured Party and remaining after payment in full of all the Liabilities shall be paid over to the appropriate Grantors or to whomsoever may be lawfully entitled to receive such surplus;

(b) Each Grantor waives all claims, damages and demands against the Secured Party arising out of the repossession, retention or sale of any of the Collateral or any part or parts thereof, except any such claims, damages and awards arising out of the gross negligence or willful misconduct of the Secured Party as determined in a final judgment of a court of competent jurisdiction; and

(c) The rights and remedies provided under this Agreement are cumulative and may be exercised singly or concurrently and are not exclusive of any rights and remedies provided by law or equity.

11. Exercise of Remedies. In connection with the exercise of its remedies pursuant to Section 10, the Secured Party may (i) exchange, enforce, waive or release any portion of the Collateral and any other security for the Liabilities; (ii) apply such Collateral or security and direct the order or manner of sale thereof as the Secured Party may determine from time to time; and (iii) settle, compromise, collect or otherwise liquidate any such Collateral or security in any manner following the occurrence of an Event of Default, without affecting or impairing the Secured Party’s right to take any other further action with respect to any Collateral or security or any part thereof.

12. Injunctive Relief. Each Grantor recognizes that if such Grantor fails to perform, observe or discharge any of its obligations or liabilities under this Agreement, any remedy of law may prove to be inadequate relief to the Secured Party; therefore, such Grantor agrees that the Secured Party, if the Secured Party so determines and requests, shall be entitled to temporary and permanent injunctive relief in any such case without the necessity of proving actual damages.

13. Security Interest Absolute. All rights of the Secured Party and security interests hereunder, and all obligations of the Grantors hereunder, shall be absolute and unconditional irrespective of:

(i) Any lack of validity or enforceability of the Underwriting Agreement or any other agreement or instrument relating thereto;

(ii) Any change in the time, manner or place of payment of, or in any other term of, all or any part of the Liabilities, or any other amendment or waiver of or any consent to any departure from the Underwriting Agreement;

(iii) Any exchange, release or non-perfection of any other collateral, or any release or amendment or waiver of or consent to departure from any guaranty, for all or any part of the Liabilities; or

(iv) Any other circumstance which might otherwise constitute a defense available to, or a discharge of, any of the Grantors in respect of the Liabilities or of this Agreement other than payment in full of the Liabilities (other than contingent and indemnification obligations for which no claim has been, or is reasonably expected to be, made).

14. Waivers. Each Grantor waives presentment and demand for payment of any of the Liabilities, protest and notice of dishonor or Event of Default with respect to any of

the Liabilities and all other notices to which such Grantor might otherwise be entitled except as otherwise expressly provided herein or in the Underwriting Agreement.

15. Term. This Agreement shall remain in full force and effect until such time as no Bonds shall remain outstanding, no obligations remain outstanding under any Bond and the Liabilities (other than contingent and indemnification obligations for which no claim has been, or is reasonably expected to be, made) have been fully paid in cash. Upon the termination of this Agreement as provided above (other than as a result of the sale of the Collateral), the Secured Party will release the security interest created hereunder.

16. Definitions. The singular shall include the plural and vice versa and any gender shall include any other gender as the context may require.

17. Successors and Assigns. This Agreement shall be binding upon and inure to the benefit of each Grantor, and the Secured Party, and their respective successors and assigns (including successors by way of merger, acquisition or similar event). A Grantor’s successors and assigns shall include, without limitation, a receiver, trustee or debtor-in-possession of or for such Grantor.

18. GOVERNING LAW. ANY DISPUTE BETWEEN THE SECURED PARTY AND THE GRANTORS ARISING OUT OF OR RELATED TO THE RELATIONSHIP ESTABLISHED BETWEEN THEM IN CONNECTION WITH THIS AGREEMENT, AND WHETHER ARISING IN CONTRACT, TORT, EQUITY, OR OTHERWISE, SHALL BE RESOLVED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK WITHOUT REGARD TO ITS CONFLICTS OF LAW PRINCIPLES (OTHER THAN SECTIONS 5-1401 AND 5-1402 OF THE NEW YORK GENERAL OBLIGATIONS LAW).

19. Severability. Whenever possible, each provision of this Agreement shall be interpreted in such manner as to be effective and valid under applicable law, but, if any provision of this Agreement shall be held to be prohibited or invalid under applicable law, such provision shall be ineffective only to the extent of such prohibition or invalidity, without invalidating the remainder of such provision or the remaining provisions of this Agreement.

20. Notices. All notices and other communications required or desired to be served, given or delivered hereunder shall be made in accordance with the applicable provisions contained in the Underwriting Agreement.

21. Amendments, Waivers and Consents. No amendment or waiver of any provision of this Agreement nor consent to any departure by any Grantor herefrom, shall in any event be effective unless the same shall be in writing and signed by the Grantors and the Secured Party, and then such amendment, waiver or consent shall be effective only in the specific instance and for the specific purpose for which given.

22. Section Headings. The section headings herein are for convenience of reference only, and shall not affect in any way the interpretation of any of the provisions hereof.

23. Execution in Counterparts. This Agreement may be executed in any number of counterparts, each of which shall be an original, but all of which shall together constitute one and the same agreement.

24. Merger. This Agreement represents the final agreement of the Grantors with respect to the matters contained herein and may not be contradicted by evidence of prior or contemporaneous agreements, or subsequent oral agreements, among the Grantors and the Secured Party.

25. Additional Grantors. If, pursuant to Section 6.14 of the Underwriting Agreement or otherwise, Great Lakes shall be required to cause any Subsidiary that is not a Grantor to become a Grantor hereunder or if for any reason Great Lakes shall desire that any Subsidiary that is not a Grantor become a Grantor hereunder, such Subsidiary shall execute and deliver to the Secured Party a joinder agreement (a “Joinder Agreement”) in substantially the form of Exhibit A attached hereto and shall thereafter for all purposes be a party hereto and have all the same rights, benefits and obligations as any Grantor party hereto.

26. Amendment and Restatement. Effective as of the date this Agreement is executed, (a) this Agreement shall amend and restate in its entirety the Existing Agreement, and (b) each reference to the Existing Agreement in any of the Underwriting Documents or any other document, instrument or agreement delivered in connection therewith shall mean and be a reference to this Agreement.

27. Reaffirmation and Restatement. This Agreement constitutes an amendment and restatement of the Existing Agreement and the Debt secured by the Existing Agreement is continuing Debt. Nothing herein shall be deemed to constitute a payment, settlement or novation of the Debt secured by the Existing Agreement, or to release or otherwise adversely affect any Lien securing such Debt or any rights the Secured Party has against any guarantor, surety or other party primarily or secondarily liable for such Debt.

IN WITNESS WHEREOF, the Grantors and the Secured Party have caused this Agreement to be duly executed and delivered by their respective officers thereunto duly authorized as of the date first above written.


GREAT LAKES DREDGE & DOCK CORPORATION

By:
Name: Title:		Deborah A. Wensel Senior Vice President, Chief Financial Officer and Treasurer

GREAT LAKES DREDGE & DOCK COMPANY

By:
Name: Title:		Deborah A. Wensel Senior Vice President, Chief Financial Officer and Treasurer

DAWSON MARINE SERVICES COMPANY

By:
Name: Title:		Deborah A. Wensel Senior Vice President, Chief Financial Officer and Treasurer

FIFTY-THREE DREDGING CORPORATION

By:
Name: Title:		Deborah A. Wensel Vice President


GREAT LAKES CARIBBEAN DREDGING, INC.

By:
Name:		Deborah A. Wensel
Title:		Senior Vice President, Chief Financial Officer and Treasurer

NORTH AMERICAN SITE DEVELOPERS, INC.

By:
Name: Title:		Deborah A. Wensel Vice President and Treasurer


TRAVELERS CASUALTY AND SURETY COMPANY

By:
Name:
Title:

TRAVELERS CASUALTY AND SURETY COMPANY OF AMERICA

By:
Name:
Title:

This JOINDER AGREEMENT, dated as of , 20 , is delivered pursuant to Section 25 of the Fourth Amended and Restated Note Pledge Agreement, dated as of December 22, 2003, (the “Note Pledge Agreement”) by Great Lakes Dredge and Dock Corporation (“Great Lakes”) and the Subsidiaries of the Great Lakes listed on the signature pages thereof in favor of Travelers Casualty and Surety Company, a Connecticut corporation (“TCASC”), and Travelers Casualty and Surety Company of America, a Connecticut corporation (together with TCASC, the “Secured Party”). Capitalized terms used herein but not defined herein are used with the meanings given them in the Note Pledge Agreement.

By executing and delivering this Joinder Agreement, the undersigned, as provided in Section 25 of the Note Pledge Agreement, hereby becomes a party to the Note Pledge Agreement as a Grantor thereunder with the same force and effect as if originally named as a Grantor therein and, without limiting the generality of the foregoing, hereby grants to the Secured Party, as collateral security for the full, prompt and complete payment and performance when due (whether at stated maturity, by acceleration or otherwise) of the Liabilities of the undersigned, hereby collaterally assigns and pledges to the Secured Party and grants to the Secured Party a Lien on and security interest in, all of its right, title and interest in, to and under the Collateral of the undersigned and expressly assumes all obligations and liabilities of a Grantor thereunder.

The information set forth in Annex 1-A is hereby added to the information set forth in the Schedules to the Note Pledge Agreement.

The undersigned hereby represents and warrants that each of the representations and warranties contained in Section 4 of the Note Pledge Agreement applicable to it is true and correct on and as the date hereof as if made on and as of such date.

IN WITNESS WHEREOF, the undersigned has caused this Joinder Agreement to be duly executed and delivered as of the date first above written.

THIS AMENDED AND RESTATED SECURITY AGREEMENT (A/R) (this “Agreement”) is dated as of December 22, 2003 and is made by GREAT LAKES DREDGE & DOCK CORPORATION, a Delaware corporation (“Great Lakes”), and each other entity a signatory hereto or which becomes a party hereto pursuant to Section 27 (together with Great Lakes, each a “Debtor” and collectively, the “Debtors”), in favor of and for the benefit of TRAVELERS CASUALTY AND SURETY COMPANY, a Connecticut corporation (as assignee of Reliance Insurance Company, a Pennsylvania corporation, United Pacific Insurance Company, a Pennsylvania corporation, Reliance National Insurance Company, a Delaware corporation, and Reliance Surety Company, a Delaware corporation) (“TCASC”) and TRAVELERS CASUALTY AND SURETY COMPANY OF AMERICA, a Connecticut corporation (“Travelers America”, and together with TCASC, the “Secured Party”). Capitalized terms used herein shall, unless otherwise defined herein, have the meanings provided in the Underwriting Agreement referred to below.

WHEREAS, Great Lakes has previously entered into that certain Security Agreement (A/R), dated as of August 19, 1998 (the “Existing Great Lakes Agreement”), in favor of and for the benefit of the Secured Party;

WHEREAS, Great Lakes Dredge & Dock Company, a New Jersey corporation (the “Company”), has previously entered into that certain Amended and Restated Security Agreement (A/R), dated as of August 19, 1998 (the “Existing Company Agreement”), in favor of and for the benefit of the Secured Party;

WHEREAS, Great Lakes Caribbean Dredging, Inc., a Delaware corporation (“Caribbean”), has previously entered into that certain Security Agreement (A/R), dated as of June 15, 2000 (the “Existing Caribbean Agreement”), in favor of and for the benefit of the Secured Party;

WHEREAS, North American Site Developers, Inc., a Massachusetts corporation (“NASDI”), has previously entered into that certain Security Agreement (A/R), dated as of April 24, 2001 (collectively with the Existing Great Lakes Agreement, the Existing Company Agreement and the Existing Caribbean Agreement, the “Existing Agreements”), in favor of and for the benefit of the Secured Party;

WHEREAS, concurrently herewith the Debtors and the Secured Party are entering into that certain Third Amended and Restated Underwriting and Continuing Indemnity Agreement dated as of even date herewith, which amends and restates that certain Second Amended and Restated Underwriting and Continuing Indemnity Agreement, dated as of August 19, 1998, as amended, restated, supplemented or otherwise modified from time to time

(as it may be further amended, restated, supplemented or otherwise modified from time to time, the “Underwriting Agreement”);

WHEREAS, Great Lakes, the Company, Caribbean and NASDI desire to amend and restate the Existing Agreements on the terms and conditions set forth in this Agreement; and

WHEREAS, each other Debtor desires to secure all obligations of such Debtor now or hereafter existing under the Underwriting Agreement and the other Underwriting Documents and to grant security interests in certain of its personal property in favor of the Secured Party.

NOW, THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, and in order to induce the Secured Party to issue Bonds in connection with the Underwriting Agreement, the parties hereto agree as follows:

SECTION 1. Grant of Security. Each Debtor hereby reaffirms its assignment, pledge and grant of a security interest pursuant to the Existing Agreement and hereby presently assigns, pledges and grants to the Secured Party for its benefit a security interest in all of such Debtor’s right, title and interest in and to the following, in each case whether now existing or hereafter arising, whether now owned or hereafter acquired and wherever the same may be located (the “Collateral”) to secure the Secured Obligations (as defined in Section 2):

(a) All Accounts (as such term is defined in the Uniform Commercial Code in effect in the State of New York (the “Code”)) arising from the Contracts, (i) including, without limitation, all right, title and interest to all monies due or to become due to such Debtor arising out of or in any way relating to any Contract, including, but not limited to progress payments, deferred payments, retained percentages, compensation for other work, and claims and the proceeds thereof, (ii) but not including any Accounts the assignment of which for collateral security purposes is prohibited by applicable local, state or Federal law;

(b) All General Intangibles (as such term is defined in the Code) in any way related to any Contract, including, without limitation, all rights, actions, causes of action, claims and demands of such Debtor in, or arising from or out of, (i) any Contract or any extensions, modifications, changes or alterations thereof or additions thereto or (ii) any subcontract in connection with a Contract or against any subcontractor or any Person, furnishing or agreeing to furnish or supply labor, materials, supplies, machinery, tools, or other equipment in connection with or on account of a Contract or against any surety or sureties of any such materialman, subcontractor, laborer or other Person;

(c) All books, records, ledger cards, files, correspondence, computer programs, tapes, disks and related data processing software (owned by such Debtor or in which it has an interest) that at any time evidence or contain

information relating to any of the Collateral or are otherwise necessary or helpful in the collection thereof or realization thereupon;

(d) All proceeds of any and all of the foregoing Collateral and, to the extent not otherwise included, all payments under insurance (whether or not the Secured Party is the loss payee thereof), or any indemnity, warranty or guaranty, payable by reason of loss or damage to or otherwise with respect to any of the foregoing Collateral. For purposes of this Agreement, the term “proceeds” includes whatever is receivable or received when Collateral or proceeds are sold, collected, exchanged or otherwise disposed of, whether such disposition is voluntary or involuntary, and includes, without limitation, all rights to payment, including returned premiums, with respect to any insurance relating thereto.

SECTION 2. Security for Obligations. This Agreement secures and the Collateral is collateral security for the prompt payment or performance in full when due (including the payment of amounts that would become due but for the operation of the automatic stay under Section 362(a) of the Bankruptcy Code, 11 U.S.C. § 362(a)) of all obligations of every nature of each Debtor now or hereafter existing under the Underwriting Agreement, the other Underwriting Documents, whether now existing or hereafter arising, voluntary or involuntary, whether or not jointly owed with others, direct or indirect, absolute or contingent, liquidated or unliquidated, and whether or not from time to time decreased or extinguished and later increased, created or incurred and all or any portion of such obligations that are paid, to the extent all or any part of such payment is avoided or recovered directly or indirectly from the Secured Party as a preference, fraudulent transfer or otherwise, (all such obligations being the “Underlying Debt”), and all obligations of every nature of each Debtor now or hereafter existing under this Agreement (all such obligations of the Debtors, together with the Underlying Debt, being the “Secured Obligations”).

SECTION 3. The Debtors Remain Liable. Anything herein to the contrary notwithstanding, (a) each Debtor shall remain liable under any contracts and agreements included in the Collateral, to the extent set forth therein, to perform all of its duties and obligations thereunder to the same extent as if this Agreement had not been executed, (b) the exercise by the Secured Party of any of the rights hereunder shall not release any Debtor from any of its duties or obligations under the contracts and agreements included in the Collateral and (c) the Secured Party shall not have any obligation or liability under any contracts and agreements included in the Collateral by reason of this Agreement, nor shall the Secured Party be obligated to perform any of the obligations or duties of any Debtor thereunder or to take any action to collect or enforce any claim for payment assigned hereunder.

SECTION 4. Representations and Warranties. Each Debtor represents and warrants, as of the date of this Agreement and on the date of the issuance of any Bond (unless such representation speaks only as of the date hereof and except as otherwise permitted by this Agreement or the Underwriting Agreement) until the termination of this Agreement, as follows:

(a) Ownership of Collateral. Except for the security interest created by this Agreement and Liens otherwise permitted under the Underwriting Agreement, the Debtors own the Collateral free and clear of any Lien. Except as

may have been filed in favor of the Secured Party relating to this Agreement or in favor of a secured party permitted by the Underwriting Agreement, no effective financing statement or other instrument similar in effect covering all or any part of the Collateral is on file in any filing or recording office;

(b) Validity. This Agreement creates a valid security interest in the Collateral securing the payment of the Secured Obligations;

(c) Governmental Authorizations. Other than those authorizations and approvals which have been obtained, no authorization, approval or other action by, and no notice to or filing with, any governmental authority or regulatory body is required (other than the filing of UCC-1 financing statements) either (i) for the grant by the Debtors of the security interests granted hereby or for the execution, delivery or performance of this Agreement by the Debtors or (ii) for the perfection of the security interests hereunder;

(d) Other Information. All written information heretofore, herein or hereafter supplied to the Secured Party by the Debtors with respect to the Collateral is accurate and complete in all material respects; and

(e) Office Locations; Fictitious Names. The jurisdiction of organization of each Debtor as of the date hereof is set forth on Schedule I hereto. The chief executive office and the office where the Debtors keep their records regarding the Accounts is located at the address of the Debtors set forth on Schedule I hereto. Within the five-year period preceding the date hereof, the Debtors have not done business under any trade-name or fictitious business name except for those names set forth on Schedule I.

SECTION 5. Further Assurances. (a) Each of the Debtors agrees that from time to time, and at their expense, each Debtor will promptly execute and deliver all further instruments and documents, and take all further action, that may be reasonably necessary or desirable, or that the Secured Party may reasonably request, in order to perfect and protect any security interest granted or purported to be granted hereby or to enable the Secured Party to exercise and enforce its rights and remedies hereunder with respect to any Collateral.

(b) Each Debtor hereby authorizes the Secured Party to file one or more financing or continuation statements, and amendments thereto, relative to all or any part of the Collateral without the signature of such Debtor, to the extent permitted under applicable law.

(c) Each Debtor will furnish to the Secured Party from time to time statements and schedules further identifying and describing the Collateral and such other reports in connection with the Collateral as the Secured Party may reasonably request, all in reasonable detail.

(a) Not use or permit any Collateral to be used in violation of any provision of this Agreement or any other Underwriting Document, any policy of insurance covering the Collateral which could reasonably be expected to cause a termination of such insurance policy or any applicable statute, regulation or ordinance the noncompliance with which could reasonably be expected to result in a Material Adverse Change; and

(b) Notify the Secured Party of any change in such Debtor’s name, identity, jurisdiction of organization or corporate structure which would cause the financing statements filed in connection herewith to be misleading prior to such change.

SECTION 8. Insurance. (a) Each Debtor will maintain or cause to be maintained, insurance as provided in Section 6.4 of the Underwriting Agreement or any other Underwriting Document. Each Debtor shall, if so requested by the Secured Party, deliver to the Secured Party copies of such policies of such insurance and, as often as the Secured Party may reasonably request, a report of a reputable insurance broker with respect to such insurance.

(a) Each Debtor shall keep its chief executive office and the offices where it keeps its records concerning the Accounts at the location therefor specified in Section 4 or, upon 30 days’ prior written notice to the Secured Party, at such other locations in a jurisdiction where all action that may be reasonably necessary or desirable or that the Secured Party may reasonably request in order to perfect and protect any security interest granted or purported to be granted hereby or to enable the Secured Party to exercise and enforce its rights and remedies hereunder with respect to such Accounts shall have been taken. Each Debtor will hold and preserve such records and will permit representatives of the Secured Party at any reasonable time upon reasonable prior notice during normal business hours to inspect and make abstracts from such records and each Debtor agrees to render to the Secured Party, at such Debtor’s cost and expense, such clerical and other assistance as may be reasonably requested with regard thereto.

(b) Except as otherwise provided in this subsection (b) of this Section 9, each Debtor shall continue to collect, at its own expense, all amounts due or to become due such Debtor under the Accounts. In connection with such collections, such Debtor may take such action as such Debtor may deem necessary or advisable to enforce collection of the Accounts; provided, however, that Secured Party shall have the right at any time, upon the occurrence and during the continuance of an Event of Default and upon written notice to such Debtor of its intention to do so, to notify the account debtors or obligors under any Accounts of the assignment of such Accounts to the Secured Party and to

direct such account debtors or obligors to make payment of all amounts due or to become due to such Debtor thereunder directly to the Secured Party, upon such notification and at the expense of such Debtor, to enforce collection of any such Accounts and to adjust, settle or compromise the amount or payment thereof, in the same manner and to the same extent as such Debtor might have done. After receipt by any Debtor of the notice from the Secured Party referred to in the proviso to the preceding sentence, (i) all amounts and proceeds (including checks and other instruments) received by such Debtor in respect of the Accounts shall be received in trust for the benefit of the Secured Party hereunder, shall be segregated from other funds of such Debtor and shall be forthwith paid over or delivered to the Secured Party in the same form as so received (with any necessary endorsement) to be held as cash collateral and applied as provided in Section 14, and (ii) such Debtor shall not adjust, settle or compromise the amount or payment of any Accounts, or release wholly or partly any account debtor or obligor thereof, or allow any credit or discount thereon.

SECTION 10. Secured Party Appointed Attorney-in-Fact. Each Debtor hereby irrevocably appoints the Secured Party such Debtor’s attorney-in-fact with full authority in the place and stead of such Debtor and in the name of such Debtor, the Secured Party or otherwise, from time to time, following the occurrence and during the continuation of an Event of Default, in the Secured Party’s discretion to take any action and to execute any instrument that the Secured Party may deem necessary or advisable to accomplish the purposes of this Agreement, including, without limitation:

(a) to obtain and adjust insurance required to be maintained by such Debtor or paid to the Secured Party pursuant to Section 8,

(b) to ask, demand, collect, sue for, recover, compound, receive and give acquittance and receipts for moneys due and to become due under or in respect of any of the Collateral,

(c) to receive, endorse, and collect any drafts or other instruments, documents and chattel paper, in connection with clauses (a) and (b) above,

(d) to file any claims or take any action or institute any proceedings that the Secured Party may deem necessary or desirable for the collection of any of the Collateral or otherwise to enforce the rights of the Secured Party with respect to any of the Collateral,

(e) to pay or discharge taxes or Liens, levied or placed upon or threatened against the Collateral, the legality or validity thereof and the amounts necessary to discharge the same to be determined by the Secured Party in its sole discretion, and such payments made by the Secured Party to become obligations of such Debtor to the Secured Party, which shall be added to the Secured Obligations and shall be due and payable immediately without demand,

(f) to sign and endorse any invoices, freight or express bills, bills of lading, storage or warehouse receipts, drafts against debtors, assignments, verifications and notices in connection with accounts and other documents relating to the Collateral,

(g) generally to sell, transfer, pledge, make any agreement with respect to or otherwise deal with any of the Collateral as fully and completely as though the Secured Party were the absolute owner thereof for all purposes, and to do, at the Secured Party’s option and such Debtor’s expense, at any time, or from time to time, all acts and things that the Secured Party deems necessary to protect, preserve or realize upon the Collateral and the Secured Party’s security interest therein, in order to effect the intent of this Agreement, all as fully and effectively as such Debtor might do;

provided, that the Secured Party shall not exercise the foregoing appointment as any Debtor’s attorney-in-fact until Secured Party shall have given notice to such Debtor following the occurrence and during the continuance of an Event of Default.

SECTION 11. Secured Party May Perform. If any Debtor fails to perform any agreement contained herein, after notice thereof from the Secured Party, the Secured Party may itself perform, or cause performance of, such agreement, and the reasonable expenses of Secured Party incurred in connection therewith shall be added to the Secured Obligations and shall be payable by such Debtor under Section 15.

(a) The powers conferred on the Secured Party hereunder are solely to protect its interest in the Collateral and shall not impose any duty upon it to exercise any such powers. Except for the safe custody of any Collateral in its possession and the accounting for moneys actually received by it hereunder, the Secured Party shall have no duty as to any Collateral or as to the taking of any necessary steps to preserve rights against prior parties or any other rights pertaining to any Collateral. The Secured Party shall be deemed to exercise reasonable care in the custody and preservation of such Collateral if such Collateral is accorded treatment substantially equal to that which the Secured Party accords its own property.

(b) The Secured Party shall not be liable to any Debtor (i) for any loss or damage sustained by it, or (ii) for any loss, damage, depreciation or other diminution in the value of any of the Collateral, that may occur as a result of, in connection with or that is in any way related to (x) any exercise by the Secured Party of any right or remedy under this Agreement or (y) any other act of or failure to act by the Secured Party, except to the extent that the same shall be determined by a judgment of a court of competent jurisdiction to be the result of acts or omissions on the part of the Secured Party constituting bad faith, gross negligence or willful misconduct.

(c) NO CLAIM MAY BE MADE BY THE DEBTORS AGAINST THE SECURED PARTY OR ANY OF ITS AFFILIATES, DIRECTORS, OFFICERS, EMPLOYEES, OR ATTORNEYS FOR ANY SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES IN RESPECT OF ANY BREACH OR WRONGFUL CONDUCT (WHETHER THE CLAIM THEREFOR IS BASED ON CONTRACT, TORT OR DUTY IMPOSED BY LAW) IN CONNECTION WITH, ARISING OUT OF OR IN ANY WAY RELATED TO THE TRANSACTIONS CONTEMPLATED AND RELATIONSHIP ESTABLISHED BY THIS AGREEMENT, OR ANY ACT, OMISSION OR EVENT OCCURRING IN CONNECTION THEREWITH; AND EACH DEBTOR HEREBY EXPRESSLY WAIVES, RELEASES AND AGREES NOT TO SUE UPON ANY SUCH CLAIM FOR ANY SUCH DAMAGES, WHETHER OR NOT ACCRUED AND WHETHER OR NOT KNOWN OR SUSPECTED TO EXIST IN ITS FAVOR.

SECTION 13. Remedies. If any Event of Default shall have occurred and be continuing, the Secured Party may exercise in respect of the Collateral, (a) all the rights and remedies of a secured party on default under the Code (whether or not the Code applies to the affected Collateral), (b) all of the rights and remedies provided for in this Agreement, the Underwriting Agreement and any other agreement between the Debtors and the Secured Party and (c) such other rights and the remedies as may be provided by law or otherwise (such rights and remedies of the Secured Party to be cumulative and non-exclusive). If an Event of Default shall have occurred and be continuing, the Secured Party also may (i) require the Debtors to, and the Debtors hereby agree that each Debtor will at its expense and upon request of the Secured Party forthwith, assemble all or part of Collateral as directed by Secured Party and make it available to the Secured Party at a place to be designated by the Secured Party that is reasonably convenient to such parties, (ii) enter onto the property where any Collateral is located and take possession thereof with or without judicial process, (iii) prior to the disposition of the Collateral, store, process, repair or recondition the Collateral or otherwise prepare the Collateral for disposition in any manner to the extent the Secured Party deems appropriate, (iv) take possession of such Debtor’s premises or place custodians in exclusive control thereof, remain on such premises and use the same and any equipment of such Debtor for the purpose of completing any work in process, taking any actions described in the preceding clause (iii) and collecting any Secured Obligation, and (v) without notice except as specified below, sell the Collateral or any part thereof in one or more parcels at public or private sale, at any of the Secured Party’s offices or elsewhere, for cash, on credit or for future delivery, and at such price or prices and upon such other terms as the Secured Party may deem commercially reasonable. Each Debtor agrees that, at least ten days’ notice to such Debtor of the time and place of any public sale or the time after which any private sale is to be made shall constitute reasonable notification. The Secured Party shall not be obligated to make any sale of Collateral regardless of notice of sale having been given. The Secured Party may adjourn any public or private sale from time to time by announcement at the time and place fixed therefor, and such sale may, without further notice, be made at the time and place to which it was so adjourned.

SECTION 14. Application of Proceeds. Except as expressly provided elsewhere in this Agreement, all proceeds received by the Secured Party in respect of any sale of, collection from or other realization upon all or any part of the Collateral may, in the discretion of the

Secured Party, be held by the Secured Party as Collateral for, and/or then, or at any other time thereafter applied, in full or in part by the Secured Party against the Secured Obligations in the following order of priority:

FIRST: To the payment of all reasonable costs and expenses of such sale, collection or other realization and all other expenses, liabilities and advances made or incurred by the Secured Party in connection therewith and all amounts for which the Secured Party is entitled to indemnification hereunder and all advances made by the Secured Party hereunder for the account of such Debtor and for the payment of all costs and expenses paid or incurred by the Secured Party in connection with the exercise of any right or remedy hereunder;

SECOND: To the payment in full of the Secured Obligations owing to the Secured Party; and

THIRD: After payment in full of the amounts specified in the preceding paragraphs, to the payment to or upon the order of such Debtor, or whomsoever may be lawfully entitled to receive the same or as a court of competent jurisdiction may direct, of any surplus then remaining from such proceeds.

All applications of proceeds to the Secured Obligations shall be applied to the payment of interest before application of payment to principal.

(a) Each Debtor agrees to indemnify the Secured Party from and against any and all claims, losses and liabilities growing out of or resulting from this Agreement (including, without limitation, enforcement of this Agreement), except claims, losses or liabilities resulting from the Secured Party’s gross negligence, bad faith or willful misconduct.

(b) Each Debtor will within 15 days after written demand pay to the Secured Party the amount of any and all reasonable expenses, including the reasonable fees and disbursements of its counsel and of any experts and agents, that the Secured Party may incur in connection with (i) the custody, preservation, use or operation of, or the sale of, collection from, or other realization upon, any of the Collateral, (ii) the exercise or enforcement of any of the rights of the Secured Party hereunder or (iii) the failure by such Debtor to perform or observe any of the provisions hereof.

Each Debtor waives any right to require the Secured Party to make or give any presentments, demands for performance, notices of nonperformance, protests, notices of protests or notices of dishonor in connection with any obligation or evidences of indebtedness held by the Secured Party as collateral, or in connection with any obligations or evidences of indebtedness that constitute in whole or in part the Underlying Debt, or in connection with the creation of new or additional indebtedness.

Each Debtor waives any defense arising by reason of, and agrees that the rights of the Secured Party and the obligations of such Debtor shall be absolute and unconditional irrespective of, (a) any disability or other defense of any other Person; (b) the unenforceability or cessation from any cause whatsoever, other than the payment in full, of the Underlying Debt; (c) the application by such Debtor of the proceeds of any Underlying Debt for purposes other than the purposes represented by such Debtor to the Secured Party or intended or understood by the Secured Party; (d) any modification of the Underlying Debt, in any form whatsoever, including without limitation the renewal, extension, acceleration or other changes in time for payment of the Underlying Debt, or other change in the terms of the Underlying Debt or any part thereof, including any increase or decrease of the rate of interest thereon; (e) any right to deferral or modification of such Debtor’s obligations hereunder by reason of any bankruptcy, reorganization, arrangement, moratorium or other debtor relief proceeding; and (f) any other circumstance that might otherwise constitute a defense available to, or a discharge of, any other Person in respect of the Underlying Debt other than payment in full of the Secured Obligations (other than contingent and indemnification obligations for which no claim has been, or is reasonably expected to be, made).

Each Debtor waives any right to enforce any remedy that the Secured Party now has or may hereafter have against any other Person, and waives any benefit of, or any right to participate in, any security whatsoever now or hereafter held by the Secured Party.

SECTION 17. Waiver of Jury Trial. THE DEBTORS AND THE SECURED PARTY HEREBY AGREE TO WAIVE THEIR RESPECTIVE RIGHTS TO A JURY TRIAL OF ANY CLAIM OR CAUSE OF ACTION BASED UPON OR ARISING OUT OF THIS AGREEMENT. The scope of this waiver is intended to be all-encompassing of any and all disputes that may be filed in any court and that relate to the subject matter of this transaction, including, without limitation, contract claims, tort claims, breach of duty claims, and all other common law and statutory claims. The Debtors and the Secured Party each acknowledge that this waiver is a material inducement for each Debtor and the Secured Party to enter into a business relationship, that each Debtor and the Secured Party have already relied on the waiver in entering into this Agreement and that each will continue to rely on the waiver in their related future dealings. The Debtors and the Secured Party further warrant and represent that each has reviewed this waiver with its legal counsel, and that each knowingly and voluntarily waives its jury trial rights following consultation with legal counsel. THIS WAIVER IS IRREVOCABLE, MEANING THAT IT MAY NOT BE MODIFIED EITHER ORALLY OR IN WRITING, AND THE WAIVER SHALL APPLY TO ANY SUBSEQUENT AMENDMENTS, RENEWALS, SUPPLEMENTS OR MODIFICATIONS TO THIS AGREEMENT. In the event of litigation, this Agreement may be filed as a written consent to a trial by the court.

SECTION 18. Continuing Security Interest. This Agreement shall create a continuing security interest in the Collateral and shall (a) remain in full force and effect until no Bonds shall remain outstanding, no obligations remain outstanding under any Bond and the payment in full of the Secured Obligations (other than contingent and indemnification obligations for which no claim has been, or is reasonably expected to be, made), (b) be binding upon each Debtor, and their respective successors and assigns and (c) inure, together with the rights and remedies of the Secured Party hereunder, to the benefit of the Secured Party and its successors, transferees and assigns. Upon the termination of the Underwriting Agreement, the

security interest granted hereby shall terminate and all rights to the Collateral shall revert to the Debtors. In addition, upon the disposition of any Collateral in compliance with Sections 6.13 and 8.12 of the Underwriting Agreement, such Collateral is hereby released by the Secured Party from the security interest granted herein. Upon any such termination or release, the Secured Party will, at the Debtors’ expense, execute and deliver to the Debtors such documents as the Debtors shall reasonably request to evidence such termination.

SECTION 19. Amendments; Etc. No amendment or waiver of any provision of this Agreement nor consent to any departure by the Debtors herefrom, shall in any event be effective unless the same shall be in writing and signed by the Secured Party and the Debtors, and then such waiver or consent shall be effective only in the specific instance and for the specific purpose for which given.

SECTION 20. Addresses for Notices. All notices and other communications provided for hereunder shall be made in accordance with Section 8.9 of the Underwriting Agreement.

SECTION 21. Consent to Jurisdiction and Service of Process. Each of the Debtors and the Secured Party hereby submits to the nonexclusive jurisdiction of the state courts of the State of New York and the federal courts located in the State of New York for all matters arising under this Agreement and related documents. Service of process sufficient for personal jurisdiction in any action against the Debtor in New York may be made by registered or certified mail, return receipt requested, to the address specified pursuant to Section 20.

SECTION 22. GOVERNING LAW; TERMS. THIS AGREEMENT SHALL BE GOVERNED BY, AND SHALL BE CONSTRUED AND ENFORCED IN ACCORDANCE WITH, THE INTERNAL LAWS OF THE STATE OF NEW YORK WITHOUT REGARD TO CONFLICTS OF LAW PRINCIPLES (OTHER THAN SECTIONS 5-1401 AND 5-1402 OF THE NEW YORK GENERAL OBLIGATIONS LAW). Unless otherwise defined herein or in the Underwriting Agreement, terms used in Article 9 of the Code as in effect in the State of New York are used herein as therein defined.

SECTION 23. Headings. Section and subsection headings in this Agreement are included herein for convenience of reference only and shall not constitute a part of this Agreement or be given any substantive effect.

SECTION 24. Severability. In case any provision in or obligation under this Agreement shall be invalid, illegal or unenforceable in any jurisdiction, the validity, legality and enforceability of the remaining provisions or obligations, or of such provision or obligation and in any other jurisdiction, shall not in any way be affected or impaired thereby.

SECTION 25. Successors and Assigns. This Agreement shall be binding upon and inure to the benefit of each Debtor and the Secured Party, and their respective successors and assigns (including successors by way of merger, acquisition or similar event). Each Debtor’s successors and assigns shall include, without limitation, a receiver, trustee or debtor-in-possession of or for such Debtor.

SECTION 26. No Other Writing. This writing is intended by the Debtors and the Secured Party as the final expression of this Agreement and is also intended as a complete and exclusive statement of the terms of their agreement with respect to the matters covered hereby. No course of dealing, course of performance or trade usage, and no parol evidence of any nature, shall be used to supplement or modify and terms of this Agreement. There are no conditions to the full effectiveness of this Agreement.

SECTION 27. Counterparts. This Agreement may be executed in one or more counterparts, each of which when so executed shall be deemed an original, but all such counterparts together shall constitute but one and the same instrument.

SECTION 28. Additional Debtors. If, pursuant to Section 6.14 of the Underwriting Agreement or otherwise, Great Lakes shall be required to cause any Subsidiary that is not a Debtor to become a Debtor hereunder or if for any reason Great Lakes shall desire that any Subsidiary that is not a Debtor become a Debtor hereunder, such Subsidiary shall execute and deliver to the Secured Party a joinder agreement (a “Joinder Agreement”) in substantially the form of Exhibit A attached hereto and shall thereafter for all purposes be a party hereto and have all the same rights, benefits and obligations as any Debtor party hereto.

SECTION 29. Amendment and Restatement. Effective as of the date this Agreement is executed, (a) this Agreement shall amend and restate in its entirety the Existing Agreements, and (b) each reference to any Existing Agreement in any of the Underwriting Documents or any other document, instrument or agreement delivered in connection therewith shall mean and be a reference to this Agreement.

SECTION 30. Reaffirmation and Restatement. This Agreement constitutes an amendment and restatement of the Existing Agreements and the Debt secured by the Existing Agreements is continuing Debt. Nothing herein shall be deemed to constitute a payment, settlement or novation of the Debt secured by the Existing Agreements, or to release or otherwise adversely affect any Lien securing such Debt or any rights the Secured Party has against any guarantor, surety or other party primarily or secondarily liable for such Debt.

IN WITNESS WHEREOF, the Debtors and the Secured Party have caused this Agreement to be duly executed and delivered by their respective officers thereunto duly authorized as of the date first above written.


GREAT LAKES DREDGE & DOCK CORPORATION

By:
Name:		Deborah A. Wensel
Title:		Senior Vice President, Chief Financial Officer and Treasurer

GREAT LAKES DREDGE & DOCK COMPANY

By:
Name:		Deborah A. Wensel
Title:		Senior Vice President, Chief Financial Officer and Treasurer

GREAT LAKES CARIBBEAN DREDGING, INC.

By:
Name:		Deborah A. Wensel
Title:		Senior Vice President, Chief Financial Officer and Treasurer

NORTH AMERICAN SITE DEVELOPERS, INC.

By:
Name:		Deborah A. Wensel
Title:		Vice President and Treasurer

DAWSON MARINE SERVICES COMPANY

By:
Name:		Deborah A. Wensel
Title:		Senior Vice President, Chief Financial Officer and Treasurer


TRAVELERS CASUALTY AND SURETY COMPANY

By:
Name:
Title:

TRAVELERS CASUALTY AND SURETY COMPANY OF AMERICA

By:
Name:
Title:

Please note that records regarding NASDI Accounts are also kept at 2122 York Road, Oak Brook, IL 60523.

The Debtors have not used any trade names or fictitious names within the five-year period preceding the date hereof. However, please note the following:

This JOINDER AGREEMENT, dated as of , 20 , is delivered pursuant to Section 27 of the Amended and Restated Security Agreement (A/R), dated as of December 22, 2003, by Great Lakes Dredge and Dock Corporation, a Delaware corporation (“Great Lakes”), and the Subsidiaries of the Great Lakes listed on the signature pages thereof in favor of Travelers Casualty and Surety Company, a Connecticut corporation (“TCASC”), and Travelers Casualty and Surety Company of America, a Connecticut corporation (together with TCASC, the “Secured Party”) (the “Receivables Security Agreement”). Capitalized terms used herein but not defined herein are used with the meanings given them in the Receivables Security Agreement.

By executing and delivering this Joinder Agreement, the undersigned, as provided in Section 28 of the Receivables Security Agreement, hereby becomes a party to the Receivables Security Agreement as a Debtor thereunder with the same force and effect as if originally named as a Debtor therein and, without limiting the generality of the foregoing, hereby grants to the Secured Party, as collateral security for the full, prompt and complete payment and performance when due (whether at stated maturity, by acceleration or otherwise) of the Secured Obligations of the undersigned, hereby collaterally assigns and pledges to the Secured Party and grants to the Secured Party a Lien on and security interest in, all of its right, title and interest in, to and under the Collateral of the undersigned and expressly assumes all obligations and liabilities of a Debtor thereunder.

The information set forth in Annex 1-A is hereby added to the information set forth in the Schedules to the Receivables Security Agreement.

The undersigned hereby represents and warrants that each of the representations and warranties contained in Section 4 of the Receivables Security Agreement applicable to it is true and correct on and as the date hereof as if made on and as of such date.

IN WITNESS WHEREOF, the undersigned has caused this Joinder Agreement to be duly executed and delivered as of the date first above written.

This SECURITY AGREEMENT (EQUIPMENT) (this “Agreement”) is made and entered into as of December 22, 2003 by GREAT LAKES DREDGE & DOCK CORPORATION, a Delaware corporation (the “Grantor”), in favor of TRAVELERS CASUALTY AND SURETY COMPANY, a Connecticut corporation (as assignee of Reliance Insurance Company, a Pennsylvania corporation, United Pacific Insurance Company, a Pennsylvania corporation, Reliance National Insurance Company, a Delaware corporation, and Reliance Surety Company, a Delaware corporation) (“TCASC”) and TRAVELERS CASUALTY AND SURETY COMPANY OF AMERICA, a Connecticut corporation (“Travelers America”, and together with TCASC, the “Secured Party”).

WHEREAS, concurrently herewith the Grantor and the Secured Party are entering into that certain Third Amended and Restated Underwriting and Continuing Indemnity Agreement, dated as of even date herewith, which amends and restates that certain Second Amended and Restated Underwriting and Continuing Indemnity Agreement, dated as of August 19, 1998, as amended, supplemented or otherwise modified from time to time (as it may be further amended, restated, supplemented or otherwise modified, the “Underwriting Agreement”; capitalized terms defined therein and not otherwise defined herein being used herein as therein defined);

WHEREAS, the Grantor desires to secure all obligations of the Grantor now or hereafter existing under the Underwriting Agreement and the other Underwriting Documents; and

WHEREAS, the Grantor desires to grant security interests in certain of its personal property in favor of the Secured Party.

“Collateral” shall mean all property and rights in property now owned or hereafter at any time acquired by the Grantor with respect to which a Lien is granted in favor of the Secured Party by the Grantor under this Agreement pursuant to Section 2.

“First Preferred Fleet Mortgage” shall mean that certain First Preferred Fleet Mortgage of even date herewith executed and delivered by the Grantor in favor of the Secured Party, as such agreement may be amended, restated, supplemented, or otherwise modified from time to time.

“Second Preferred Fleet Mortgage” shall mean that certain Second Preferred Fleet Mortgage of even date herewith executed and delivered by the Grantor in favor of the Secured Party, as such agreement may be amended, restated, supplemented, or otherwise modified from time to time.

“UCC” shall mean the Uniform Commercial Code, as the same may, from time to time, be in effect in the State of New York; provided, however, in the event that, by reason of mandatory provisions of law, any or all of the attachment, perfection or priority of the Secured Party’s security interest in any Collateral is governed by the Uniform Commercial Code as in effect in a jurisdiction other than the State of New York, the term “UCC” shall mean the Uniform Commercial Code as in effect in such other jurisdiction for purposes of the provisions hereof relating to such attachment, perfection or priority and for purposes of definitions related to such provisions.

“Vessels” shall mean, collectively, those “Vessels” from time to time subject to and as defined in the First Preferred Fleet Mortgage or the Second Preferred Fleet Mortgage (including, without limitation, those Vessels described in Schedule I hereto).

2. Grant of Security. To secure the prompt and complete payment, observance and performance when due of (a) the Grantor’s obligations and liabilities under the Underwriting Agreement and the other Underwriting Documents, including, without limitation, all “Loss” under and as defined in the Underwriting Agreement and (b) the Grantor’s obligations and liabilities under this Agreement, any other agreement, document or instrument executed by the Grantor pursuant to or in connection with such agreements (all such obligations and liabilities of the Grantor now or hereafter existing being hereinafter referred to as the “Liabilities”), the Grantor pledges to the Secured Party, and grants to the Secured Party, a security interest in all of the Grantor’s right, title and interest in and to the following, whether now owned or existing or hereafter arising or acquired and wheresoever located: all Vessels and all equipment (including, without limitation, all “equipment” as such term is defined in Section 9-102(a)(33) of the UCC), whether now owned or hereafter acquired or arising, which is from time to time attached to, located on, or related to, one or more of the Vessels, including, without limitation, all boilers, engines, machinery, masts, spars, sails, boats, anchors, cables, chains, rigging, tackle, apparel, cranes, drills, excavators, shovels, construction equipment, furniture, furnishings, appliances, tools, tooling, and all other goods of every type and description (other than inventory), in each instance whether now owned or hereafter acquired by the Grantor and wherever located, together, in each instance, with all accessions and additions to any of the foregoing, substitutions therefor, earnings and other intangibles with respect thereto, replacements, proceeds and products thereof (including, without limitation, all charter and freight hire proceeds, insurance proceeds and requisition proceeds) (collectively, the “Equipment”), and all books and records with respect thereto.

3. Grantor Remains Liable. Anything herein to the contrary notwithstanding, (a) the Grantor shall remain solely liable under any contracts and agreements related to the Collateral to perform all of its duties and obligations thereunder to the same extent as if this Agreement had not been executed, (b) the exercise by the Secured Party of any of its rights hereunder shall not release the Grantor from any of its duties or obligations under the contracts and agreements related to the Collateral, and (c) the Secured Party shall not have any responsibility, obligation or liability under the contracts and agreements related to the Collateral by reason of this Agreement, nor shall the Secured Party be required or obligated, in any manner, to (i) perform or fulfill any of the obligations or duties of the Grantor thereunder, (ii) make any payment, or make any inquiry as to the nature or sufficiency of any payment received by the Grantor or the sufficiency of any performance by any party under any such contract or agreement or (iii) present or file any claim, or take any action to collect or enforce any claim for payment assigned hereunder.

4. Representations and Warranties. The Grantor represents and warrants, as of the date of this Agreement and on the date of the issuance of any Bond (unless such representation speaks only as of the date hereof and except as otherwise permitted by this Agreement or the Underwriting Agreement) until the termination of this Agreement pursuant to Section 17, that:

(a) The correct corporate name of the Grantor is set forth in the first paragraph of this Agreement. The chief place of business and chief executive office of the Grantor are located at 2122 York Road, Oak Brook, Illinois 60523. All records included within or otherwise concerning the Collateral are located at such addresses or at the locations of the Equipment described and permitted herein.

(b) On the date hereof, the Grantor’s Equipment (other than Equipment in transit or out for repair) is kept at the locations listed on Schedule II hereto.

(c) The Grantor has exclusive possession and control of such Equipment, except for such Equipment which is leased to third parties, or is otherwise in possession of third parties, in a manner not prohibited by the Underwriting Agreement.

(d) The Grantor is the legal and beneficial owner of the Collateral free and clear of all Liens, except for Liens permitted by the Underwriting Agreement (“Permitted Liens”) and has rights in and the power to transfer each item of Collateral.

(e) The Grantor conducts business under its legal corporate name and, within the five-year period preceding the date hereof, the Grantor has not used any trade names or fictitious names, except as set forth on Schedule III.

(f) This Agreement creates in favor of the Secured Party a legal, valid and enforceable security interest in all Collateral in which a security interest may be created under the UCC (hereinafter, the “UCC Collateral”). When financing statements against the Grantor have been properly presented for filing and the filing fee has been tendered or have been accepted by the filing officer in the appropriate public recording offices in the Grantor’s jurisdiction of incorporation, the Secured Party will have a fully perfected first priority lien on,

and security interest in, the UCC Collateral in which a security interest may be perfected by the filing of UCC financing statements, subject only to Permitted Liens.

(g) No authorization, approval or other action by, and no notice to or filing with, any governmental authority or regulatory body that has not already been taken or made and which is in full force and effect, is required (i) for the grant by the Grantor of the security interest in the Collateral granted hereby; (ii) for the execution, delivery or performance of this Agreement by the Grantor; or (iii) for the exercise by the Secured Party of any of its other rights or remedies hereunder.

5. Perfection and Maintenance of Security Interest and Lien. The Grantor agrees that until such time as no Bonds shall remain outstanding, no obligations remain outstanding under any Bond and all of the Liabilities (other than contingent and indemnification obligations for which no claim has been, or is reasonably expected to be, made) have been fully satisfied, this Agreement and the security interests and Liens created hereby shall continue in full force and effect. The Grantor shall perform any and all steps reasonably requested by the Secured Party to perfect, maintain and protect the Secured Party’s security interests in and Liens on and against the Collateral granted or purported to be granted hereby or to enable the Secured Party to exercise its rights and remedies hereunder with respect to any Collateral, including, without limitation, executing and filing financing or continuation statements, or amendments thereof, in form and substance reasonably satisfactory to the Secured Party and executing and delivering all further instruments and documents, and taking all further action, as the Secured Party may reasonably request.

6. Financing Statements. To the extent permitted by applicable law, the Grantor hereby authorizes the Secured Party to file financing or continuation statements and amendments thereto disclosing the security interest granted to the Secured Party under this Agreement without the Grantor’s signature appearing thereon, and the Secured Party agrees to notify the Grantor when such a filing has been made. If any Collateral is in the possession or control of any third party (including, without limitation, any bailee or warehouseman or other third party), upon the Secured Party’s request, Grantor shall notify such Person of the Secured Party’s security interest in such Collateral and, upon the Secured Party’s request, instruct them to hold all such Collateral for the Secured Party’s account and subject to the Secured Party’s instructions.

7. Filing Costs. The Grantor shall pay the costs of, or incidental to, all recordings or filings of all financing statements, including, without limitation, any filing expenses incurred by the Secured Party pursuant to Section 6.

8. Schedules of Collateral. The Grantor shall furnish to the Secured Party from time to time statements and schedules further identifying and describing the Collateral and such other reports in connection with the Collateral as the Secured Party may reasonably request, all in reasonable detail.

9. Secured Party Appointed Attorney-in-Fact. The Grantor hereby irrevocably appoints the Secured Party as the Grantor’s attorney-in-fact, with full authority in the place and stead of the Grantor and in the Grantor’s name, the Secured Party’s name or otherwise,

from time to time following the occurrence and during the existence of an Event of Default, in the Secured Party’s discretion, to take any action and to execute any instrument which Secured Party may deem necessary or advisable to accomplish the purposes of this Agreement, including, without limitation, to (a) obtain and adjust insurance required to be paid to the Secured Party pursuant to the Underwriting Agreement; (b) ask, demand, collect, sue for, recover, compromise, receive and give acquittance and receipts for moneys due and to become due under or in respect of any of the Collateral; (c) receive, endorse, and collect any drafts or other instruments, documents and chattel paper, in connection with clause (a) or (b) above; and (d) file any claims or take any action or institute any proceedings that the Secured Party may deem necessary or desirable for the collection of any of the Collateral, or otherwise to enforce the rights of the Secured Party with respect to any of the Collateral.

10. Secured Party May Perform. If the Grantor fails to perform any agreement contained herein, at any time after written notice from the Secured Party to Grantor of such failure, the Secured Party may perform, or cause performance of, such agreement, and the expenses of the Secured Party incurred in connection therewith shall be added to the Liabilities and shall be payable by the Grantor within 15 days after demand therefor.

11. Secured Party’s Duties. The powers conferred on the Secured Party hereunder are solely to protect its interest in the Collateral and shall not impose any duty upon it to exercise any such powers. Except for the safe custody of any Collateral in its possession and the accounting for moneys actually received by it hereunder, the Secured Party shall not have any duty as to any Collateral. The Secured Party shall be deemed to have exercised reasonable care in the custody and preservation of the Collateral in its possession if the Collateral is accorded treatment substantially equal to that which the Secured Party accords its own property, it being understood that the Secured Party shall be under no obligation to take any necessary steps to preserve rights against prior parties or any other rights pertaining to any Collateral, but may do so at its option, and all reasonable expenses incurred in connection therewith shall be for the sole account of the Grantor and shall be added to the Liabilities.

12. Remedies. (a) If any Event of Default shall have occurred and be continuing:

any of the offices of the Secured Party or elsewhere, for cash, on credit or for future delivery, and upon such other terms as the Secured Party may deem commercially reasonable. The Grantor agrees that, to the extent notice of sale shall be required by law, at least ten (10) days’ notice to the Grantor of the time and place of any public sale or the time after which any private sale is to be made shall constitute reasonable notification. The Secured Party shall not be obligated to make any sale of Collateral regardless of notice of sale having been given. The Secured Party may adjourn any public or private sale from time to time by announcement at the time and place fixed therefor, and such sale may, without further notice, be made at the time and place to which it was so adjourned;

(ii) The Secured Party shall apply all cash proceeds received by the Secured Party in respect of any sale of, collection from, or other realization upon all or any part of the Collateral (after payment of all expenses incurred by the Secured Party in connection with such sale, collection or realization), against all or any part of the Liabilities in such order as may be required by the Secured Party. Any surplus of such cash or cash proceeds held by the Secured Party and remaining after payment in full of all the Liabilities shall be paid over to the Grantor or to whomsoever may be lawfully entitled to receive such surplus;

(b) The Grantor waives all claims, damages and demands against the Secured Party arising out of the repossession, retention or sale of any of the Collateral or any part or parts thereof, except any such claims, damages and awards arising out of the gross negligence or willful misconduct of the Secured Party, as the case may be, as determined in a final judgment of a court of competent jurisdiction; and

(c) The rights and remedies provided under this Agreement are cumulative and may be exercised singly or concurrently and are not exclusive of any rights and remedies provided by law or equity.

13. Exercise of Remedies. In connection with the exercise of its remedies pursuant to Section 12, the Secured Party may (i) exchange, enforce, waive or release any portion of the Collateral and any other security for the Liabilities; (ii) apply such Collateral or security and direct the order or manner of sale thereof as the Secured Party may determine from time to time; and (iii) settle, compromise, collect or otherwise liquidate any such Collateral or security in any manner following the occurrence of an Event of Default, without affecting or impairing the Secured Party’s right to take any other further action with respect to any Collateral or security or any part thereof.

14. Injunctive Relief. The Grantor recognizes that if the Grantor fails to perform, observe or discharge any of its obligations or liabilities under this Agreement, any remedy of law may prove to be inadequate relief to the Secured Party; therefore, the Grantor agrees that the Secured Party, if the Secured Party so determines and requests, shall be entitled to temporary and permanent injunctive relief in any such case without the necessity of proving actual damages.

15. Security Interest Absolute. All rights of the Secured Party and security interests hereunder, and all obligations of the Grantor hereunder, shall be absolute and unconditional irrespective of:

(i) Any lack of validity or enforceability of the Underwriting Agreement or any other agreement or instrument relating thereto;

(iii) Any exchange, release or non-perfection of any other collateral, or any release or amendment or waiver of or consent to departure from any guaranty, for all or any part of the Liabilities; or

(iv) any other circumstance which might otherwise constitute a defense available to, or a discharge of, the Grantor in respect of the Liabilities or of this Agreement other than payment in full of the Liabilities (other than contingent and indemnification obligations for which no claim has been, or is reasonably expected to be, made).

16. Waivers. The Grantor waives presentment and demand for payment of any of the Liabilities, protest and notice of dishonor or Event of Default with respect to any of the Liabilities and all other notices to which the Grantor might otherwise be entitled except as otherwise expressly provided herein or in the Underwriting Agreement.

17. Term. This Agreement shall remain in full force and effect until such time as no Bonds shall remain outstanding, no obligations remain outstanding under any Bond and the Liabilities (other than contingent and indemnification obligations for which no claim has been, or is reasonably expected to be, made) have been fully paid in cash. Upon the termination of this Agreement as provided above (other than as a result of the sale of the Collateral), Secured Party will release the security interest created hereunder.

18. Definitions. The singular shall include the plural and vice versa and any gender shall include any other gender as the context may require.

19. Successors and Assigns. This Agreement shall be binding upon and inure to the benefit of the Grantor and the Secured Party, and their respective successors and assigns (including successors by way of merger, acquisition or similar event). The Grantor’s successors and assigns shall include, without limitation, a receiver, trustee or debtor-in-possession of or for the Grantor.

20. GOVERNING LAW. ANY DISPUTE BETWEEN SECURED PARTY AND THE GRANTOR ARISING OUT OF OR RELATED TO THE RELATIONSHIP ESTABLISHED BETWEEN THEM IN CONNECTION WITH THIS AGREEMENT, AND WHETHER ARISING IN CONTRACT, TORT, EQUITY, OR OTHERWISE, SHALL BE RESOLVED IN ACCORDANCE WITH THE INTERNAL LAWS, AND NOT THE CONFLICTS OF LAW PROVISIONS (OTHER THAN SECTIONS 5-1401 AND 5-1402 OF THE NEW YORK GENERAL OBLIGATIONS LAW), OF THE STATE OF NEW YORK.

21. Severability. Whenever possible, each provision of this Agreement shall be interpreted in such manner as to be effective and valid under applicable law, but, if any provision of this Agreement shall be held to be prohibited or invalid under applicable law, such

provision shall be ineffective only to the extent of such prohibition or invalidity, without invalidating the remainder of such provision or the remaining provisions of this Agreement.

22. Notices. All notices and other communications required or desired to be served, given or delivered hereunder shall be made in accordance with the applicable provisions contained in the Underwriting Agreement.

23. Amendments, Waivers and Consents. No amendment or waiver of any provision of this Agreement nor consent to any departure by the Grantor herefrom, shall in any event be effective unless the same shall be in writing and signed by the Grantor and the Secured Party, and then such amendment, waiver or consent shall be effective only in the specific instance and for the specific purpose for which given.

24. Section Headings. The section headings herein are for convenience of reference only, and shall not affect in any way the interpretation of any of the provisions hereof.

25. Execution in Counterparts. This Agreement may be executed in any number of counterparts, each of which shall be an original, but all of which shall together constitute one and the same agreement.

26. Merger. This Agreement represents the final agreement of the Grantor with respect to the matters contained herein and may not be contradicted by evidence of prior or contemporaneous agreements, or subsequent oral agreements, between the Grantor and Secured Party.

IN WITNESS WHEREOF, the Grantor and the Secured Party have caused this Agreement to be duly executed and delivered by their respective officers thereunto duly authorized as of the date first above written.


TRAVELERS CASUALTY AND SURETY COMPANY

By:
		Name:
		Title:

TRAVELERS CASUALTY AND SURETY COMPANY OF AMERICA

By:
		Name:
		Title:

The Grantor has not used any trade names or fictitious names within the five-year period preceding the date hereof. However, please note that, effective on December 31, 1998, Great Lakes International, Inc., a Delaware corporation and a wholly-owned subsidiary of the Grantor, was merged with and into the Grantor.

This SECOND AMENDED AND RESTATED SECURITY AGREEMENT (EQUIPMENT) (this “Agreement”) is made and entered into as of December 22, 2003 by GREAT LAKES DREDGE & DOCK COMPANY, a New Jersey corporation (the “Grantor”), in favor of TRAVELERS CASUALTY AND SURETY COMPANY, a Connecticut corporation (as assignee of Reliance Insurance Company, a Pennsylvania corporation, United Pacific Insurance Company, a Pennsylvania corporation, Reliance National Insurance Company, a Delaware corporation, and Reliance Surety Company, a Delaware corporation) (“TCASC”) and TRAVELERS CASUALTY AND SURETY COMPANY OF AMERICA, a Connecticut corporation (“Travelers America”, and together with TCASC, the “Secured Party”).

WHEREAS, the Grantor has previously entered into that certain Amended and Restated Security Agreement (Equipment) (the “Existing Agreement”), dated as of August 19, 1998, in favor of and for the benefit of the Secured Party;

WHEREAS, the Grantor and the Secured Party desire to amend and restate the Existing Agreement on the terms and conditions set forth in this Agreement.

“UCC” shall mean the Uniform Commercial Code, as the same may, from time to time, be in effect in the State of New York; provided, however, in the event that, by reason of mandatory provisions of law, any or all of the attachment, perfection or priority of the Secured Party’s security interest in any Collateral is governed by the Uniform Commercial Code as in effect in a jurisdiction other than the State of New York, the term “UCC” shall mean the Uniform Commercial Code as in effect in such other jurisdiction for purposes of the provisions hereof relating to such attachment, perfection or priority and for purposes of definitions related to such provisions.

2. Grant of Security. To secure the prompt and complete payment, observance and performance when due of (a) the Grantor’s obligations and liabilities under the Underwriting Agreement and the other Underwriting Documents, including, without limitation, all “Loss” under and as defined in the Underwriting Agreement and (b) the Grantor’s obligations and liabilities under this Agreement, any other agreement, document or instrument executed by the Grantor pursuant to or in connection with such agreements (all such obligations and liabilities of the Grantor now or hereafter existing being hereinafter referred to as the “Liabilities”), the Grantor reaffirms its pledge and grant of a security interest pursuant to the Existing Agreement and hereby presently pledges to the Secured Party, and grants to the Secured Party, a security interest in all of the Grantor’s right, title and interest in and to the following, whether now owned or existing or hereafter arising or acquired and wheresoever located: all Vessels and all equipment (including, without limitation, all “equipment” as such term is defined in Section 9-102(a)(33) of the UCC), whether now owned or hereafter acquired or arising, which is from time to time attached to, located on, or related to, one or more of the Vessels, including, without limitation, all boilers, engines, machinery, masts, spars, sails, boats, anchors, cables, chains, rigging, tackle, apparel, cranes, drills, excavators, shovels, construction equipment, furniture, furnishings, appliances, tools, tooling, and all other goods of every type and description (other than inventory), in each instance whether now owned or hereafter acquired by the Grantor and wherever located, together, in each instance, with all accessions and additions to any of the foregoing, substitutions therefor, earnings and other intangibles with respect thereto, replacements, proceeds and products thereof (including, without limitation, all charter and freight hire proceeds, insurance proceeds and requisition proceeds) (collectively, the “Equipment”), and all books and records with respect thereto.