GLOBAL NOTE 7.375% SeniorNotes due 2019

Exhibit 4.7

GLOBAL NOTE

7.375% Senior Notes due 2019

THIS GLOBAL NOTE IS HELD BY THE DEPOSITARY (AS DEFINED IN THE INDENTURE GOVERNING THIS NOTE) OR ITS NOMINEE IN CUSTODY FOR THE BENEFIT OF THE BENEFICIAL OWNERS HEREOF, AND IS NOT TRANSFERABLE TO ANY PERSON UNDER ANY CIRCUMSTANCES EXCEPT THAT (I) THE TRUSTEE MAY MAKE SUCH NOTATIONS HEREON AS MAY BE REQUIRED PURSUANT TO SECTION 2.06 OF THE INDENTURE, (II) THIS GLOBAL NOTE MAY BE EXCHANGED IN WHOLE BUT NOT IN PART PURSUANT TO SECTION 2.06(a) OF THE INDENTURE, (III) THIS GLOBAL NOTE MAY BE DELIVERED TO THE TRUSTEE FOR CANCELLATION PURSUANT TO SECTION 2.11 OF THE INDENTURE AND (IV) THIS GLOBAL NOTE MAY BE TRANSFERRED TO A SUCCESSOR DEPOSITARY WITH THE PRIOR WRITTEN CONSENT OF THE COMPANY.

UNLESS AND UNTIL IT IS EXCHANGED IN WHOLE OR IN PART FOR NOTES IN DEFINITIVE FORM, THIS NOTE MAY NOT BE TRANSFERRED EXCEPT AS A WHOLE BY THE DEPOSITARY TO A NOMINEE OF THE DEPOSITARY OR BY A NOMINEE OF THE DEPOSITARY TO THE DEPOSITARY OR ANOTHER NOMINEE OF THE DEPOSITARY OR BY THE DEPOSITARY OR ANY SUCH NOMINEE TO A SUCCESSOR DEPOSITARY OR A NOMINEE OF SUCH SUCCESSOR DEPOSITARY. UNLESS THIS NOTE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION (“DTC”), TO THE COMPANY OR ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY NOTE ISSUED IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS MAY BE REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO SUCH OTHER ENTITY AS MAY BE REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST HEREIN.

GREAT LAKES DREDGE & DOCK CORPORATION

promises to pay to CEDE & CO., or registered assigns, the principal sum of TWENTY-FIVE MILLION Dollars ($25,000,000) on February 1, 2019.

Interest Payment Dates: February 1 and August 1, commencing August 1, 2015.

Record Dates: January 15 and July 15.

Dated: [            ], 2015.

1

IN WITNESS WHEREOF, the Company has caused this Note to be signed manually or by facsimile by its duly authorized officer.

2

3

(Back of Note)

7.375% Senior Notes due 2019

Capitalized terms used herein shall have the meanings assigned to them in the Indenture referred to below unless otherwise indicated.

1. Interest. Great Lakes Dredge & Dock Corporation, a Delaware corporation (“the Company”), promises to pay interest on the principal amount of this Note at 7.375% per annum until maturity and shall pay Additional Interest, if any, as provided in Section 4 of the Registration Rights Agreement. The Company shall pay interest semi-annually on February 1 and August 1 of each year, or if any such day is not a Business Day, on the next succeeding Business Day (each an “Interest Payment Date”). Interest on the Notes shall accrue from the most recent date to which interest has been paid or, if no interest has been paid, from February 1, 2015; provided, however, that if there is no existing Default in the payment of interest, and if this Note is authenticated between a record date referred to on the face hereof and the next succeeding Interest Payment Date, interest shall accrue from such next succeeding Interest Payment Date; provided, further, that the first Interest Payment Date shall be August 1, 2015. The Company shall pay interest (including post-petition interest in any proceeding under any Bankruptcy Law) on overdue principal and premium, if any, from time to time at a rate that is 1% per annum in excess of the interest rate then in effect under the Indenture and this Note; it shall pay interest (including post-petition interest in any proceeding under any Bankruptcy Law) on overdue installments of interest and Additional Interest, if any (without regard to any applicable grace periods), from time to time at the same rate to the extent lawful. Interest shall be computed on the basis of a 360-day year of twelve 30-day months.

2. Method of Payment. The Company shall pay interest on the Notes (except defaulted interest) to the Persons in whose name this Note (or one or more Predecessor Notes) is registered at the close of business on the January 15 or July 15 next preceding the Interest Payment Date, even if such Notes are cancelled after such record date and on or before such Interest Payment Date, except as provided in Section 2.12 of the Indenture with respect to defaulted interest. The Notes shall be payable as to principal, premium, if any, and interest and Additional Interest, if any, at the office or agency of the Company maintained for such purpose, or, at the option of the Company, payment of interest may be made by check mailed to the Holders at their addresses set forth in the Security Register; provided, however, that payment by wire transfer of immediately available funds shall be required with respect to principal of and interest and Additional Interest, if any, and premium, if any, on, all Global Notes and all other Notes the Holders of which shall have provided wire transfer instructions to the Company or the Paying Agent. Such payment shall be in such coin or currency of the United States of America as at the time of payment is legal tender for payment of public and private debts.

3. Paying Agent and Registrar. Initially, Wells Fargo Bank, National Association, the Trustee under the Indenture, shall act as Paying Agent and Registrar. The Company may change any Paying Agent or Registrar without notice to any Holder. The Company or any of its Subsidiaries may act in any such capacity.

4

4. Indenture. The Company issued the Notes under an Indenture, dated as of January 28, 2011 (as originally executed or as it may from time to time be supplemented or amended, the “Indenture”), among the Company, the Guarantors from time to time party thereto and the Trustee. The terms of the Notes include those stated in the Indenture and those made part of the Indenture by reference to the Trust Indenture Act of 1939, as amended (15 U.S. Code §§ 77aaa-77bbbb). The Notes are subject to all such terms, and Holders are referred to the Indenture and such Act for a statement of such terms. To the extent any provision of this Note conflicts with the express provisions of the Indenture, the provisions of the Indenture shall govern and be controlling. The Notes are obligations of the Company unlimited in aggregate principal amount.

5. Optional Redemption.

(a) The Company may redeem all or any portion of the Notes, at once or over time, after giving the required notice under the Indenture. The Notes may be redeemed at the redemption prices (expressed as percentages of principal amount) set forth below, in cash, plus accrued and unpaid interest and Additional Interest, if any, to the applicable Redemption Date (subject to the right of Holders of record on the relevant Regular Record Date to receive interest due on the relevant Interest Payment Date), if redeemed during the twelve-month period commencing on February 1 of the years indicated below:

(b) Any prepayment pursuant to this paragraph shall be made pursuant to the provisions of Sections 3.01 through 3.06 of the Indenture.

6. Mandatory Redemption. Except as set forth in Sections 4.12 and 4.17 of the Indenture, the Company shall not be required to make mandatory redemption or sinking fund payments with respect to the Notes.

7. Repurchase at Option of Holder.

(a) Upon the occurrence of a Change of Control, each Holder shall have the right to require the Company to repurchase all or any part (equal to $2,000 or an integral multiple of $1,000 in excess thereof) of such Holder’s Notes (a “Change of Control Offer”) at a purchase price in cash equal to 101% of the aggregate principal amount of the Notes repurchased, plus accrued and unpaid interest and Additional Interest, if any, on the Notes repurchased, to the Purchase Date (subject to the right of Holders of record on the relevant Regular Record Date to receive interest due on the relevant Interest Payment Date).

(b) When the aggregate amount of Excess Proceeds from Asset Sales exceeds $20.0 million, the Company will be required to make an offer to all Holders of Notes (an “Asset Sale Offer”) to purchase the maximum principal amount of Notes and, if the Company is required to do so under the terms of any other Indebtedness that is pari passu with the Notes, such other Indebtedness on a pro rata basis with the Notes, that may be purchased out of the

5

Excess Proceeds, at an offer price in cash in an amount equal to 100% of the principal amount of the Notes plus accrued and unpaid interest and Additional Interest thereon, if any, to the date of repurchase, in accordance with the procedures set forth in the Indenture. To the extent that the aggregate amount of Notes (including Additional Notes) and other pari passu Indebtedness tendered pursuant to an Asset Sale Offer is less than the Excess Proceeds, the Company (or any Restricted Subsidiary) may use such deficiency for any purpose not prohibited by the Indenture. If the aggregate principal amount of Notes and other pari passu Indebtedness tendered by holders thereof exceeds the amount of Excess Proceeds, the Trustee shall, subject to Applicable Procedures, select the Notes and such other pari passu Indebtedness to be purchased on a pro rata basis. Holders of Notes that are the subject of an offer to purchase will receive an Asset Sale Offer from the Company prior to any related purchase date and may elect to have such Notes purchased by completing the form entitled “Option of Holder to Elect Purchase” on the reverse of the Notes.

8. Notice of Redemption. Notice of redemption shall be mailed at least 30 days but not more than 60 days before the Redemption Date to each Holder whose Notes are to be redeemed at its registered address. Notes in denominations larger than $2,000 may be redeemed in part but only in the amount of $2,000 or whole multiples of $1,000 in excess thereof, unless all of the Notes held by a Holder are to be redeemed. On and after the Redemption Date interest ceases to accrue on Notes or portions thereof called for redemption.

9. Denominations, Transfer, Exchange. The Notes are in registered form without coupons in denominations of $2,000 and integral multiples of $1,000 in excess thereof. This Note shall represent the aggregate principal amount of outstanding Notes from time to time endorsed hereon and the aggregate principal amount of Notes represented hereby may from time to time be reduced or increased, as appropriate, to reflect exchanges and redemptions. The transfer of Notes may be registered and Notes may be exchanged as provided in the Indenture. The Registrar and the Trustee may require a Holder, among other things, to furnish appropriate endorsements and transfer documents and the Company may require a Holder to pay any taxes and fees required by law or permitted by the Indenture. The Company need not exchange or register the transfer of any Note or portion of a Note selected for redemption, except for the unredeemed portion of any Note being redeemed in part. Also, the Company need not exchange or register the transfer of any Notes for a period of 15 days before a selection of Notes to be redeemed or during the period between a Regular Record Date and the corresponding Interest Payment Date.

10. Persons Deemed Owners. The registered Holder of a Note shall be treated as its owner for all purposes.

11. Amendment, Supplement and Waiver. Subject to certain exceptions, the Company and the Trustee may amend or supplement the Indenture or the Notes with the consent of the Holders of a majority in aggregate principal amount of the then outstanding Notes, including Additional Notes, if any, voting as a single class (including consents obtained in connection with a purchase of or tender offer or exchange offer for the Notes), and, subject to Sections 6.04 and 6.07 of the Indenture, any existing Default or Event of Default (except a continuing Default or Event of Default in the payment of principal, premium, if any, interest or Additional Interest, if any, on the Notes) or compliance with any provision of the Indenture or

6

the Notes (except for certain covenants and provisions of the Indenture which cannot be amended without the consent of each Holder) may be waived with the consent of the Holders of a majority in aggregate principal amount of the then outstanding Notes, including Additional Notes, if any, then outstanding voting as a single class (including consents obtained in connection with a purchase of or tender offer or exchange offer for the Notes). Without the consent of any Holder, the Company and the Trustee may amend or supplement the Indenture or the Notes to cure any ambiguity, defect or inconsistency, to provide for uncertificated notes in addition to or in place of certificated notes, to provide for the assumption of the Company’s or a Guarantor’s obligations to Holders of Notes in the case of a merger or consolidation or sale of all or substantially all of the Company’s assets, to provide for the issuance of Additional Notes in accordance with the provisions set forth in the Indenture on the date of the Indenture, to make any change that would provide any additional rights or benefits to the Holders of Notes or that does not adversely affect the legal rights under the Indenture of any Holder, to comply with requirements of the Commission in order to effect or maintain the qualification of the Indenture under the Trust Indenture Act, to allow any Guarantor to guarantee the Notes, or to conform any provision of the Indenture to the “Description of Notes” contained in the Offering Memorandum.

12. Defaults and Remedies. Each of the following is an Event of Default under the Indenture: (i) default for 30 days in the payment when due of interest on, or Additional Interest with respect to, the Notes; (ii) default in payment when due of the principal of or premium, if any, on the Notes; (iii) failure by the Company or any of its Restricted Subsidiaries to comply with Section 4.17 of the Indenture; (iv) failure by the Company or any of its Restricted Subsidiaries for 60 days after notice by the Trustee or by the Holders of at least 25% in principal amount of Notes then outstanding to comply with any of its other agreements in the Indenture or the Notes; (v) default under any mortgage, indenture or instrument under which there may be issued or by which there may be secured or evidenced any Indebtedness for money borrowed by the Company or any of its Restricted Subsidiaries (or the payment of which is guaranteed by the Company or any of its Restricted Subsidiaries) whether the Indebtedness or guarantee now exists, or is created after the Issue Date, which default: (A) is caused by a failure to pay principal on such Indebtedness at final stated maturity prior to the expiration of the grace period provided in the Indebtedness on the date of the default (a “Payment Default”) or (B) results in the acceleration of the Indebtedness prior to its stated maturity and, in each case, the principal amount of any Indebtedness, together with the principal amount of any other such Indebtedness under which there has been a Payment Default or the maturity of which has been so accelerated (after giving effect to any applicable grace period), aggregates $20.0 million or more; (vi) failure by the Company or any of its Restricted Subsidiaries to pay final judgments aggregating in excess of $20.0 million (net of any amount with respect to which a reputable insurance company with assets over $100.0 million has acknowledged liability in writing), which judgments are not paid, discharged or stayed for a period of 60 days after their entry; (vii) certain events of bankruptcy, insolvency or reorganization affecting the Company or any of its Significant Subsidiaries; and (viii) except as permitted by the Indenture, any Guarantee of any Significant Subsidiary (or group of Guarantors that, collectively, would be a Significant Subsidiary) shall be held in any judicial proceeding to be unenforceable or invalid or shall cease for any reason to be in full force and effect or any Guarantor that is a Significant Subsidiary (or group of Guarantors that, collectively, would be a Significant Subsidiary), or any Person acting on behalf of any Guarantor that is a Significant Subsidiary (or group of Guarantors that, collectively, would be a Significant Subsidiary), shall deny or disaffirm its obligations under its Guarantee.

7

If any Event of Default occurs and is continuing, the Trustee or the Holders of at least 25% in principal amount of the then outstanding Notes may declare all the Notes to be due and payable. Upon a declaration of acceleration, principal premium, if any, Additional Interest, if any, and interest on the Notes will become due and payable. Notwithstanding the foregoing, in the case of an Event of Default arising from certain events of bankruptcy or insolvency described in the Indenture, all outstanding Notes shall become due and payable without further action or notice. Holders may not enforce the Indenture or the Notes except as provided in the Indenture. Subject to certain limitations, Holders of a majority in aggregate principal amount of the then outstanding Notes may direct the Trustee in its exercise of any trust or power vested in it by the Indenture. The Trustee may withhold from Holders notice of any continuing Default or Event of Default (except a Default or Event of Default relating to the payment of principal or interest or Additional Interest) if it determines that withholding notice is in their interest. The Holders of at least a majority in aggregate principal amount of the Notes then outstanding by notice to the Trustee may on behalf of the Holders of all of the Notes waive any existing Default or Event of Default and its consequences under the Indenture except a continuing Default or Event of Default in (i) the payment of interest or Additional Interest on, or the principal of, the Notes and (ii) in respect of a covenant or provision which under the Indenture cannot be modified or amended without the consent of the Holder of each Note affected by such modification or amendment. Upon any waiver of a Default or Event of Default, such Default shall cease to exist, and any Event of Default arising therefrom shall be deemed cured for every purpose of the Indenture but no such waiver shall extend to any subsequent or other Default or Event of Default or impair any right consequent thereon. The Company is required to deliver to the Trustee annually a statement regarding compliance with the Indenture, and the Company is required upon becoming aware of any Default or Event of Default, to deliver to the Trustee a statement specifying such Default or Event of Default.

13. Trustee Dealings with Company. Subject to certain limitations, the Trustee in its individual or any other capacity may become the owner or pledgee of Notes and may otherwise deal with the Company or any Affiliate of the Company with the same rights it would have if it were not Trustee.

14. No Recourse Against Others. No past, present or future director, officer, employee, incorporator or stockholder of the Company or of any Guarantor, as such, shall have any liability for any obligations of the Company or of the Guarantors under the Indenture, the Notes, the Guarantees or for any claim based on, in respect of, or by reason of, such obligations or their creation. Each Holder by accepting a Note waives and releases all such liability.

15. Authentication. This Note shall not be valid until authenticated by the manual signature of the Trustee or an authenticating agent.

16. Abbreviations. Customary abbreviations may be used in the name of a Holder or an assignee, such as: TEN COM (= tenants in common), TEN ENT (= tenants by the entireties), JT TEN (= joint tenants with right of survivorship and not as tenants in common), CUST (= Custodian), and U/G/M/A (= Uniform Gifts to Minors Act).

17. Additional Rights of Holders of Restricted Global Notes and Restricted Definitive Notes. In addition to the rights provided to Holders of Notes under the Indenture,

8

Holders of Restricted Global Notes and Restricted Definitive Notes that are Initial Notes shall have all the rights set forth in the Registration Rights Agreement, dated as of the Issue Date, among the Company, the Guarantors from time to time party thereto and the initial purchasers named therein or, in the case of Additional Notes, Holders of Restricted Global Notes and Restricted Definitive Notes shall have the rights set forth in one or more Registration Rights Agreements, if any, among the Company and the other parties thereto, relating to rights given by the Company to the purchasers of any Additional Notes.

18. CUSIP Numbers. Pursuant to a recommendation promulgated by the Committee on Uniform Security Identification Procedures, the Company has caused CUSIP numbers to be printed on the Notes and has directed the Trustee to use CUSIP numbers in notices of redemption as a convenience to Holders. No representation is made as to the accuracy of such numbers either as printed on the Notes or as contained in any notice of redemption and reliance may be placed only on the other identification numbers placed thereon.

19. Governing Law. The internal law of the State of New York shall govern and be used to construe this Note without giving effect to applicable principles of conflicts of law to the extent that the application of the laws of another jurisdiction would be required thereby.

The Company shall furnish to any Holder upon written request and without charge a copy of the Indenture. Requests may be made to:

Great Lakes Dredge & Dock Corporation

2122 York Road

Oak Brook, Illinois 60523

Attention: Chief Financial Officer

9

Option of Holder to Elect Purchase

If you want to elect to have this Note purchased by the Company pursuant to Section 4.12 or 4.17 of the Indenture, check the box below:

If you want to elect to have only part of the Note purchased by the Company pursuant to Section 4.12 or Section 4.17 of the Indenture, state the amount you elect to have purchased: $

10

Assignment Form

To assign this Note, fill in the form below:

(I) or (we) assign and transfer this Note to

(Insert assignee’s social security or other tax I.D. no.)

(Print or type assignee’s name, address and zip code)

and irrevocably appoint

as agent to transfer this Note on the books of the Company. The agent may substitute another to act for him.

11

SCHEDULE OF EXCHANGES OF INTERESTS IN THE GLOBAL NOTE

The following exchanges of a part of this Global Note for an interest in another Global Note or for a Definitive Note, or exchanges of a part of another Global Note or Definitive Note for an interest in this Global Note, have been made:

12