DESCRIPTION OF EXCHANGE NOTES

General

In this description, references to the “notes” are to the old notes and the exchange notes, unless the context otherwise requires. We issued the old notes and will issue the exchange notes pursuant to an indenture dated as of January 28, 2011, among us, the Guarantors and Wells Fargo Bank, National Association, as trustee. The terms of the notes will include those expressly set forth in the indenture and those made part of the indenture by reference to the Trust Indenture Act of 1939, as amended, or the “Trust Indenture Act.” The indenture is unlimited in aggregate principal amount, although the issuance of the old notes was limited to $250.0 million. We may issue an unlimited principal amount of additional notes having identical terms and conditions as the notes. We will only be permitted to issue additional notes if at the time of such issuance, we were in compliance with the covenants contained in the indenture. Any additional notes will be part of the same issue as the notes that we are currently offering and will vote on all matters with the holders of the notes.

You can find the definitions of certain terms used in this description under “—Certain Definitions.” In this description, the words “we” and “Great Lakes” refer only to Great Lakes Dredge & Dock Corporation and not to any of its Subsidiaries.

The following description is a summary of the provisions of the notes and the indenture that we consider to be material. It does not restate the indenture in its entirety. We urge you to read the indenture because it, and not this description, defines your rights as a holder of the notes. Copies of the indenture are available as set forth below under “—Additional Information.”

The registered holder of a note will be treated as its owner for all purposes. Only registered holders will have rights under the indenture.

Brief Description of the Notes and the Guarantees

The Notes

The notes are:

The Guarantees

Each Guarantee of the notes is:

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As of March 31, 2011, Great Lakes and its Subsidiaries had approximately $257.7 million of Indebtedness, $250.0 million of which consisted of the old notes. These amounts exclude approximately $9.5 million of outstanding letters of credit and $135.5 million of additional borrowing capacity under our Credit Agreement, $15.7 million of letters of credit outstanding under our International Letter of Credit Facility and contingent obligations, including $296.5 million of performance bonds outstanding under the Bonding Agreement.

The operations of Great Lakes are conducted primarily through its Subsidiaries and, therefore, Great Lakes will be dependent upon the cash flow of these Subsidiaries to meet its obligations, including its obligations under the notes. Other than the Excluded Subsidiaries, all of the existing domestic Wholly Owned Restricted Subsidiaries of Great Lakes are, and all future domestic Wholly Owned Restricted Subsidiaries of Great Lakes are expected to be, Guarantors. Further claims of creditors of Subsidiaries that are not Guarantors will generally have priority with respect to the assets and earnings of these Subsidiaries over your claims.

As of the Issue Date, all of Great Lakes’ Subsidiaries were Restricted Subsidiaries. However, under specified circumstances, Great Lakes will be able to designate current or future Subsidiaries as Unrestricted Subsidiaries. Unrestricted Subsidiaries will not be subject to many of the restrictive covenants set forth in the indenture. Unrestricted Subsidiaries will not Guarantee the notes. In addition, in the event of bankruptcy, liquidation or reorganization of any of Great Lakes’ Subsidiaries that are not Guarantors, such subsidiaries will pay their trade creditors before they will be able to distribute any of their assets to Great Lakes. As of March 31, 2011, our Subsidiaries that are not Guarantors had approximately $7.4 million of Indebtedness and other liabilities (including guarantees of Indebtedness of Great Lakes under the Credit Agreement and other Indebtedness and liabilities owed to Great Lakes by such non-guarantor Subsidiaries, but excluding approximately $9.5 million of outstanding letters of credit and $135.5 million of additional borrowing capacity under our Credit Agreement, $15.7 million of letters of credit outstanding under our International Letter of Credit Facility and contingent obligations, including $296.5 million of performance bonds outstanding under the Bonding Agreement), all of which rank structurally senior to the notes. In addition, to the extent that the Company or any Restricted Subsidiary is a general partner in any Person, we are liable for our allocated percentage of such Person’s liabilities, other than non-recourse liabilities.

Principal, Maturity and Interest

Great Lakes issued $250.0 million aggregate principal amount of notes in the initial offering. The notes were issued in denominations of $2,000 and integral multiples of $1,000 in excess thereof. Interest on the notes accrues at the rate of 7.375% per annum and is payable semi-annually in arrears on February 1 and August 1 of each year, commencing August 1, 2011 to holders of record on the immediately preceding January 15 and July 15. The notes will mature on February 1, 2019. Interest will be computed on the basis of a 360-day year comprised of twelve 30-day months.

Guarantees

Great Lakes’ payment obligations under the notes are fully and unconditionally guaranteed on a joint and several basis by the Guarantors. The Guarantee of each Guarantor is a general senior unsecured obligation of such Guarantor. The obligations of each Guarantor under its Guarantee will be limited so as not to constitute a fraudulent conveyance under applicable law. See, however, “Risk Factors—Risks Related to the Notes.”

Each Guarantor that makes a payment or distribution under a Guarantee shall be entitled to a contribution from each other Guarantor and a right of reimbursement from Great Lakes.

A Guarantor shall be released from all of its obligations under its Guarantee if all or substantially all of its assets are sold or all of its capital stock is sold, in each case in a transaction as described under “Repurchase at the Option of Holders—Asset Sales,” or the Guarantor merges with or into or consolidates with, or transfers all or substantially all of its assets to, Great Lakes or another Guarantor in a transaction in compliance with “—Limitation on Mergers, Consolidations or Sales of Assets.” In addition, the indenture provides that, in the

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event Great Lakes properly designates a Restricted Subsidiary as an Unrestricted Subsidiary in accordance with the indenture, then the Restricted Subsidiary shall, in accordance with the indenture, be released from its obligations under its Guarantee upon the effectiveness of the designation.

Optional Redemption

Except as described below, the notes are not redeemable before February 1, 2015. At any time, at our option, we may redeem the notes, in whole or in part upon not less than 30 nor more than 60 days’ notice, in cash at the following redemption prices (expressed as a percentage of principal amount) if redeemed during the twelve-month period beginning on February 1 of the years indicated below:

In addition, we must pay all accrued and unpaid interest, and Additional Interest, if any, on the notes redeemed.

On one or more occasions before February 1, 2014, we may use the net cash proceeds of one or more Equity Offerings to redeem up to 35% of the original principal amount of the notes at a redemption price of 107.375% of their principal amount plus accrued and unpaid interest and Additional Interest, if any, thereon; provided that:

(1) at least 65% of the original principal amount of the notes remain outstanding immediately after the occurrence of any such redemption (excluding notes held by Great Lakes and its Subsidiaries); and

(2) any such redemption occurs not more than 180 days following the closing of such Equity Offering.

At any time prior to February 1, 2015, Great Lakes may redeem the notes, in whole or in part upon not less than 30 nor more than 60 days’ notice, in cash, at a redemption price equal to 100% of the principal amount of the Notes redeemed plus the Applicable Premium as of, and accrued and unpaid interest, if any, to the date of redemption (the “Redemption Date”), subject to the rights of the holders of record on the relevant record date to receive interest due on the relevant interest payment date.

Notwithstanding the preceding, Great Lakes may, from time to time, acquire the notes in the open market or by undertaking a tender offer for the notes at any time, subject to the terms of the indenture and applicable securities laws.

Selection and Notice

In the event we choose to redeem less than all of the notes at any time, selection of notes for redemption or repurchase will be made by the trustee, subject to applicable DTC procedures, (1) in compliance with the requirements of the principal national securities exchange, if any, on which the notes are listed, (2) on a pro rata basis, by lot or (3) by an alternative method as the trustee shall deem fair and appropriate. Notices of redemption shall be mailed by first class mail at least 30 but not more than 60 days before the redemption date to each holder of notes to be redeemed at its registered address. Notices of redemption may not be conditional. If any note is to be redeemed in part only, the notice of redemption that relates to the note shall state the portion of the principal amount to be redeemed. A new note in principal amount equal to the unredeemed portion will be issued in the name of the holder upon cancellation of the original note. No notes of $2,000 principal amount or less shall be redeemed in part. Notes called for redemption become due on the date fixed for redemption. On and after the redemption date, interest and Additional Interest cease to accrue on notes or portions of them called for redemption or repurchase, unless we fail to redeem any such note.

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Mandatory Redemption

Except as set forth below under “—Repurchase at the Option of Holders,” Great Lakes is not required to make mandatory redemption or sinking fund payments with respect to the notes.

Repurchase at the Option of Holders

Change of Control

Upon the occurrence of a Change of Control, each holder of the notes will have the right to require Great Lakes to repurchase all or any part (equal to $2,000 or an integral multiple of $1,000) of the holder’s notes pursuant to the offer described below (the “Change of Control Offer”) at an offer price in cash equal to 101% of the aggregate principal amount plus accrued and unpaid interest and Additional Interest thereon, if any, to the date of purchase (the “Change of Control Payment”). Within 30 days following any Change of Control, Great Lakes will mail a notice to each holder and the trustee describing the transaction or transactions that constitute the Change of Control and offering to repurchase notes on the date specified in the notice, which date shall be no earlier than 30 days and no later than 60 days from the date the notice is mailed (the “Change of Control Payment Date”), pursuant to the procedures required by the indenture and described in the notice. Great Lakes will comply with the requirements of Rule 14e-1 under the Exchange Act and any other securities laws and regulations thereunder to the extent these laws and regulations are applicable in connection with the repurchase of the notes as a result of a Change of Control. To the extent that the provisions of any securities laws or regulations directly conflict with the provisions of the indenture relating to the Change of Control Offer, Great Lakes will comply with the applicable securities laws and regulations and shall not be deemed to have breached its obligations described in the indenture by virtue of this compliance.

On the Change of Control Payment Date, Great Lakes will, to the extent lawful,

(1) accept for payment all notes or portions of the notes properly tendered pursuant to the Change of Control Offer;

(2) deposit with the Paying Agent (as defined in the indenture) an amount equal to the Change of Control Payment in respect of all notes or portions of the notes so tendered; and

(3) deliver or cause to be delivered to the trustee the notes so accepted together with an officers’ certificate stating the aggregate principal amount of notes or portions of the notes being purchased by Great Lakes.

The Paying Agent will promptly mail to each holder of notes so tendered the Change of Control Payment for the notes, and the trustee will promptly authenticate and mail (or cause to be transferred by book entry) to each holder a new note equal in principal amount to any unpurchased portion of the notes surrendered, if any; provided that each new note will be in a principal amount of $2,000 or an integral multiple of $1,000 in excess thereof. Great Lakes will publicly announce the results of the Change of Control Offer on or as soon as practicable after the Change of Control Payment Date.

The Change of Control provisions described above will be applicable whether or not any other provisions of the indenture are applicable. Except as described above with respect to a Change of Control, the indenture does not contain provisions that permit the holders of the notes to require that Great Lakes repurchase or redeem the notes in the event of a takeover, recapitalization or similar transaction. The Credit Agreement provides that change of control events with respect to Great Lakes would constitute a default thereunder. Any future credit agreements or other agreements relating to senior Indebtedness to which Great Lakes becomes a party may contain similar restrictions and provisions. In the event a Change of Control occurs at a time when Great Lakes is prohibited under the terms of the Credit Agreement or other Indebtedness from purchasing notes, Great Lakes could seek the consent of its lenders to the purchase of notes or could attempt to refinance the borrowings that contain the prohibition. If Great Lakes does not obtain the required consent or repay the borrowings, Great Lakes will remain prohibited from purchasing notes. In that case, Great Lakes’ failure to purchase tendered notes would

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constitute an Event of Default under the indenture, which would, in turn, constitute an additional default under the Credit Agreement or other future senior Indebtedness, including the Bonding Agreement. Finally, Great Lakes’ ability to pay cash to the holders of notes upon a repurchase may be limited by Great Lakes’ then existing financial resources.

Great Lakes will not be required to make a Change of Control Offer upon a Change of Control if (1) a third party makes the Change of Control Offer in the manner, at the times and otherwise in compliance with the requirements set forth in the indenture applicable to a Change of Control Offer made by Great Lakes and purchases all notes validly tendered and not withdrawn under its Change of Control Offer or (2) notice of redemption has been given pursuant to the indenture as described herein under the caption “—Optional Redemption,” unless and until there has been a default in payment of the applicable redemption price. A Change of Control Offer may be made in advance of a Change of Control, conditional upon the Change of Control, if a definitive agreement is in place for the Change of Control at the time of making of the Change of Control Offer.

Asset Sales

Great Lakes will not, and will not permit any of its Restricted Subsidiaries to, consummate an Asset Sale unless:

(1) Great Lakes (or the Restricted Subsidiary, as the case may be) receives consideration at the time of the Asset Sale at least equal to the Fair Market Value of the assets or Equity Interests issued or sold or otherwise disposed of; and

(2) at least 75% of the consideration therefor received by Great Lakes or the Restricted Subsidiary is in the form of Qualified Proceeds.

For the purposes of clause (2) above and no other provision, each of the following shall be deemed cash:

Within 360 days after the receipt of any Net Proceeds from an Asset Sale, Great Lakes or any Restricted Subsidiary may apply the Net Proceeds, at its option:

(1) to repay or otherwise retire amounts owing under the Credit Agreement in accordance with the Credit Agreement and to correspondingly reduce commitments with respect thereto;

(2) to repay or otherwise retire amounts owing under other Secured Indebtedness (other than subordinated obligations), which Secured Indebtedness is permitted by the Indenture, and to correspondingly reduce commitments with respect thereto; and/or

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(3) to the acquisition of a majority of the assets of, or a majority of the Voting Stock of, another Permitted Business, to making a capital expenditure for the construction, repair, improvement or acquisition of assets that are used or useful in a Permitted Business or commitment to do any of the foregoing provided that this commitment or its reasonable replacement is consummated substantially in accordance with its terms; or

(4) for a combination of uses described in clauses (1), (2) and (3).

Pending the final application of any Net Proceeds, Great Lakes and its Restricted Subsidiaries may temporarily reduce revolving credit borrowings or otherwise invest the Net Proceeds in any manner that is not prohibited by the indenture. Any Net Proceeds from Asset Sales that are not applied or invested as provided in the immediately preceding paragraph will be deemed to constitute “Excess Proceeds.” When the aggregate amount of Excess Proceeds exceeds $20.0 million, Great Lakes 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 Great Lakes 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 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 any Excess Proceeds remain after consummation of an Asset Sale Offer, Great Lakes may use the Excess Proceeds for any general corporate purpose. If the aggregate principal amount of notes and other pari passu Indebtedness tendered into such Asset Sale Offer exceeds the amount of Excess Proceeds, subject to DTC procedures, the trustee will select the notes and such other pari passu Indebtedness to be purchased on a pro rata basis. Upon completion of each Asset Sale Offer, the amount of Excess Proceeds shall be reset at zero.

Certain Covenants

The indenture contains, among others, the following covenants.

Limitation on Restricted Payments

Great Lakes will not, and will not permit any of its Restricted Subsidiaries to, directly or indirectly make any Restricted Payment, unless:

(1) at the time of and after giving effect to the Restricted Payment, no Default or Event of Default shall have occurred and is continuing or would occur as a consequence of the Restricted Payment;

(2) Great Lakes would, at the time of the Restricted Payment and after giving it pro forma effect as if the Restricted Payment had been made at the beginning of the applicable four-quarter period, have been permitted to incur at least $1.00 of additional Indebtedness pursuant to the Fixed Charge Coverage Ratio test set forth in the first paragraph of the covenant described below under the caption “—Limitation on Incurrence of Indebtedness and Issuance of Disqualified Stock”; and

(3) the Restricted Payment, together with the aggregate amount of all other Restricted Payments made by Great Lakes and its Restricted Subsidiaries after December 22, 2003 (excluding Restricted Payments permitted by clauses (2), (3), (4), (7), (8), (10), (11), (12), (14) and (15) of the next succeeding paragraph), is less than the sum, without duplication, of:

(A) 50% of the Consolidated Net Income of Great Lakes for the period (taken as one accounting period) from the first day of the fiscal quarter of Great Lakes commencing on October 1, 2003 to the end of Great Lakes’ most recently ended fiscal quarter for which internal financial statements are available at the time of the Restricted Payment (or, if Consolidated Net Income for the period is a deficit, less 100% of the deficit), plus

(B) 100% of the aggregate Fair Market Value of Qualified Proceeds received by Great Lakes since December 22, 2003 as a contribution to its equity capital or from the issue or sale of Equity Interests of

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Great Lakes (other than Disqualified Stock) or from the issue or sale of Disqualified Stock or debt securities of Great Lakes that have been converted into Equity Interests (other than Equity Interests (or Disqualified Stock or convertible debt securities) sold to a Subsidiary of Great Lakes), plus

(C) to the extent that any Restricted Investment that was made after December 22, 2003 is sold for cash or otherwise liquidated or repaid for cash, the cash return of capital received with respect to the Restricted Investment (less the cost of disposition, if any), plus

(D) 50% of any dividends received by Great Lakes or a Wholly Owned Restricted Subsidiary after December 22, 2003 from an Unrestricted Subsidiary of Great Lakes, to the extent that the dividends were not otherwise included in Consolidated Net Income of Great Lakes for the period, plus

(E) to the extent that any Unrestricted Subsidiary is redesignated as a Restricted Subsidiary, or upon a merger or consolidation of any Unrestricted Subsidiary into Great Lakes or any of its Restricted Subsidiaries, in each case after December 22, 2003, the lesser of (A) the Fair Market Value of Great Lakes’ Investment in the Subsidiary as of the date of the redesignation or merger or consolidation and (B) the Fair Market Value as of the date on which the Subsidiary was originally designated as an Unrestricted Subsidiary.

The provisions of this covenant will not prohibit:

(1) the payment of any dividend or other distribution within 60 days after the date of declaration, if at said date of declaration payment would have complied with the provisions of the indenture;

(2) the making of any Restricted Payment in exchange for, or out of the net cash proceeds of the sale within 30 days of the making of such Restricted Payment (other than to a Subsidiary of Great Lakes) of, other Equity Interests of Great Lakes (other than any Disqualified Stock) or the net cash proceeds of a common equity capital contribution to Great Lakes; provided that the amount of any net cash proceeds that are utilized for any Restricted Payment pursuant to this clause (2) shall be excluded from clause (3)(B) of the preceding paragraph;

(3)   (A) the defeasance, redemption, repurchase or other acquisition of subordinated Indebtedness with the net cash proceeds from an incurrence of Permitted Refinancing Indebtedness; and

(B) the purchase, redemption or other acquisition for value of any Disqualified Stock with the net cash proceeds from the sale of other Equity Interests of Great Lakes or an incurrence of Permitted Refinancing Indebtedness;

(4) the payment of any dividend or making of any distribution by a Subsidiary of Great Lakes to the holders of its Equity Interests on a pro rata basis;

(5) so long as no Default or Event of Default shall have occurred and is continuing or would occur as a result of the making of such Restricted Payment, the repurchase, redemption or other acquisition or retirement for value of any Equity Interests of Great Lakes or any direct or indirect parent of Great Lakes held by any present, future or former member of Great Lakes’ (or any of their Subsidiaries’) Board of Directors or any present, future or former officer, employee or director of Great Lakes, any of its Restricted Subsidiaries or any direct or indirect parent of Great Lakes pursuant to any equity subscription agreement, stockholder agreement, stock option agreement, employment agreement or other similar agreements or employee benefit plan; provided that

(A) the aggregate price paid for all the repurchased, redeemed, acquired or retired Equity Interests shall not exceed $3.0 million in any calendar year (with unused amounts in any calendar year being carried over to succeeding calendar years subject to a maximum (without giving effect to clause (B)) of $6.0 million), plus

(B) in the case of a repurchase, redemption or other acquisition or retirement of Equity Interests of Great Lakes or of any direct or indirect parent of Great Lakes, the aggregate cash proceeds received by Great Lakes, or its direct or indirect parent to the extent such cash proceeds are contributed to the

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common equity capital of Great Lakes, during that calendar year from any reissuance of Equity Interests by Great Lakes or any direct or indirect parent of Great Lakes to employees, officers and directors of Great Lakes and its Restricted Subsidiaries plus the cash proceeds of any “key man” life insurance policy received by Great Lakes, and any cash proceeds paid to Great Lakes in connection with the issuance or exercise of, any management or employee Equity Interests so acquired;

(6) so long as no Default or Event of Default has occurred and is continuing or would occur as a result of the making of such Restricted Payment, the declaration and payment of regularly scheduled dividends to holders of any class or series of Disqualified Stock of Great Lakes, or any class or series of Disqualified Stock or preferred stock of any Restricted Subsidiary that was issued after December 22, 2003 (other than to Great Lakes or another Wholly Owned Restricted Subsidiary of Great Lakes) in compliance with the covenant described below under the caption “—Limitation on Incurrence of Indebtedness and Issuance of Disqualified Stock”;

(7) repurchase of Equity Interests deemed to occur upon exercise of stock options and warrants if those Equity Interests represent a portion of the exercise price of the options or warrants;

(8) loans to employees of Great Lakes or any Restricted Subsidiary in the ordinary course of business not to exceed $2.0 million at any one time outstanding;

(9) so long as no Default or Event of Default shall have occurred and is continuing or would occur as a result of the making of such Restricted Payment, Restricted Payments not to exceed $35.0 million since December 22, 2003;

(10) any payments made by Great Lakes or a Restricted Subsidiary for the purposes described in the offering memorandum dated January 28, 2011 relating to the issuance of the old notes under the caption “Use of Proceeds”;

(11) payments, advances, loans or expense reimbursements made to any direct or indirect parent corporation of Great Lakes to permit the payment by such entity of reasonable general operating expenses, accounting, legal, corporate reporting and administrative expenses incurred in the ordinary course of its business in an amount not to exceed $1.0 million per annum;

(12) (A) for so long as Great Lakes is a member of a group filing a consolidated or combined tax return with a parent corporation, payments to the parent in respect of an allocable portion of the tax liabilities of such group that is attributable to Great Lakes and its Subsidiaries (“Tax Payments”); provided, that the Tax Payments shall not exceed the lesser of (i) the amount of the relevant tax (including any penalties and interest) that Great Lakes would owe if Great Lakes were filing (and had always filed) a separate tax return (or a separate consolidated or combined return with its Subsidiaries that are members of the consolidated or combined group), taking into account any carryovers and carrybacks of tax attributes (such as net operating losses) of Great Lakes and such Subsidiaries from other taxable years and (ii) the proportionate share of Great Lakes and its Subsidiaries of the net amount of the relevant tax that the parent actually owes to the appropriate taxing authority or (B) in the event that and for so long as Great Lakes is organized as a limited liability company or partnership, the payment of Permitted Tax Distributions;

(13) the repurchase, redemption or other acquisition or retirement for value of Indebtedness that is subordinated to the notes with Excess Proceeds to the extent such Excess Proceeds are permitted to be used for general corporate purposes under the covenant entitled “—Repurchase at the Option of Holders—Asset Sales”;

(14) the repurchase, redemption or other acquisition for value of Capital Stock of Great Lakes or any direct or indirect parent of Great Lakes representing fractional shares of such Capital Stock in connection with a merger, consolidation, amalgamation or other combination involving Great Lakes or any direct or indirect parent of Great Lakes;

(15) Investments that are made with Excluded Contributions;

(16) so long as no Default or Event of Default shall have occurred and is continuing or would occur as the result of making such Restricted Payment, upon the occurrence of a Change of Control and within 60

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days after completion of the offer to repurchase notes pursuant to the covenant described above under the caption “—Repurchase at the Option of Holders—Change of Control” (including the purchase of all notes tendered), any purchase or redemption of Indebtedness of Great Lakes subordinated to the notes that is required to be repurchased or redeemed pursuant to the terms thereof as a result of such Change of Control, at a purchase price not greater than 101% of the outstanding principal amount (or accreted amount, in the case of any debt issued at a discount from its principal amount at maturity) thereof, plus accrued and unpaid interest, if any; and

(17) so long as no Default or Event of Default has occurred and is continuing or would occur as the result of the making of such Restricted Payment, the declaration and payment of dividends to holders of any class or series of preferred stock of Great Lakes if Great Lakes would have been entitled to incur or assume Indebtedness under the covenant described below under “—Limitation on Incurrence of Indebtedness and Issuance of Disqualified Stock,” in an aggregate principal amount equal to the aggregate liquidation value of the preferred stock at the time of issuance of such preferred stock (provided that the cash proceeds from the issuance of such preferred stock shall be excluded from clause (3)(B) of the preceding paragraph).

As of March 31, 2011, Great Lakes had approximately $181.5 million available for Restricted Payments under the first paragraph of this covenant.

The Board of Directors may designate any Restricted Subsidiary to be an Unrestricted Subsidiary if that designation would not cause a Default. For purposes of making this determination, all outstanding Investments by Great Lakes and its Restricted Subsidiaries (except to the extent repaid in cash) in the Subsidiary so designated will be deemed to be Restricted Payments at the time of the designation and shall either reduce the amount available for Restricted Payments under the first paragraph of this covenant or reduce the amount available for future Investments under one or more clauses of the definition of “Permitted Investments,” as Great Lakes determines in its sole discretion. All outstanding Investments will be deemed to constitute Investments in an amount equal to the Fair Market Value of the Investments at the time of the designation. Such designation will only be permitted if a Restricted Payment in that amount would be permitted at that time and if the Restricted Subsidiary otherwise meets the definition of an Unrestricted Subsidiary.

For purposes of determining compliance with this covenant, in the event that Restricted Payment meets the criteria of more than one of the exceptions described in (1) through (17) above or is entitled to be made pursuant to the first paragraph of this covenant, Great Lakes shall, in its sole discretion, classify the Restricted Payment in any manner that complies with the covenant. The amount of all Restricted Payments (other than cash) shall be the Fair Market Value on the date of the Restricted Payment of the asset(s) or securities proposed to be transferred or issued by Great Lakes or the Restricted Subsidiary, as the case may be, pursuant to the Restricted Payment. The Fair Market Value of any non-cash Restricted Payment or return of capital on any Restricted Subsidiary shall be determined by the Board of Directors whose resolution regarding the Fair Market Value shall be delivered to the trustee, the determination to be based upon an opinion or appraisal issued by an accounting, appraisal or investment banking firm of national standing if the Fair Market Value exceeds $20.0 million. Not later than the 30 days after the date of making any Restricted Payment, Great Lakes shall deliver to the trustee an Officers’ Certificate stating that the Restricted Payment is permitted and setting forth the basis upon which the calculations required by this covenant were computed, together with a copy of any fairness opinion or appraisal required by the indenture.

Limitation on Incurrence of Indebtedness and Issuance of Disqualified Stock

Great Lakes will not, and will not permit any of its Restricted Subsidiaries to, directly or indirectly, create, incur, issue, assume, guarantee or otherwise become directly or indirectly liable, contingently or otherwise, with respect to (collectively, “incur”) any Indebtedness (including Acquired Debt) and Great Lakes will not issue any Disqualified Stock and will not permit any of its Restricted Subsidiaries to issue any shares of preferred stock; provided, however, that Great Lakes may incur Indebtedness (including Acquired Debt) or issue shares of Disqualified Stock and Great Lakes’ Restricted Subsidiaries may incur Indebtedness or issue shares of preferred

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stock if the Fixed Charge Coverage Ratio for Great Lakes’ most recently ended four full fiscal quarters for which internal financial statements are available immediately preceding the date on which the additional Indebtedness is incurred or the Disqualified Stock or preferred stock is issued would have been at least 2.0 to 1, determined on a pro forma basis (including a pro forma application of the net proceeds therefrom), as if the additional Indebtedness had been incurred, or the Disqualified Stock or preferred stock had been issued, as the case may be, at the beginning of such four-quarter period; provided that the maximum principal amount of Indebtedness (including Acquired Debt), Disqualified Stock and preferred stock that may be incurred or issued, as applicable, pursuant to this paragraph by Restricted Subsidiaries that are not Guarantors shall not exceed $50.0 million.

The provisions of the first paragraph of this covenant will not apply to the incurrence of any of the following items of Indebtedness (collectively, “Permitted Debt”):

(1) the incurrence by Great Lakes or any Restricted Subsidiary of Indebtedness and reimbursement obligations under letters of credit under the Credit Facilities (including any guarantee of the Indebtedness by any Restricted Subsidiary); provided that the aggregate principal amount of all Indebtedness outstanding under all Credit Facilities after giving effect to the incurrence does not exceed an amount equal to $250.0 million (with letters of credit being deemed to have a principal amount equal to the maximum face amount thereunder) plus (in the case of any refinancing) the aggregate amount of fees, underwriting discounts, premiums and other costs and expenses incurred in connection with the refinancing, less the aggregate amount of all Net Proceeds of Asset Sales applied by Great Lakes or any Restricted Subsidiary to repay any term Indebtedness under Credit Facilities pursuant to the covenant “—Repurchase at the Option of Holders—Asset Sales”;

(2) the incurrence by Great Lakes and its Restricted Subsidiaries of the Existing Indebtedness;

(3) the incurrence by Great Lakes and the Guarantors of Indebtedness evidenced by the notes and related Guarantees issued in this offering, and any exchange notes and related Guarantees issued in respect of notes outstanding under the indenture;

(4) the incurrence by Great Lakes or any of its Restricted Subsidiaries of Indebtedness represented by Capital Lease Obligations, mortgage or construction financings or purchase money obligations or similar financings or refinancings thereof, in each case incurred for the purpose of financing or refinancing all or any part of the purchase price or cost of design, installation, construction, repair or improvement of property (real or personal), plant or equipment used in the business of Great Lakes or any Restricted Subsidiary (whether through the direct acquisition, construction, repair or improvement of such assets or the acquisition of Equity Interests of any Person acquiring, constructing, repairing, improving or otherwise owning such assets), in an aggregate principal amount (which amount may, but need not, be incurred in whole or in part after the Issue Date under the Credit Facilities) not to exceed the greater of: (A) $75.0 million or (B) 12.5% of Total Tangible Assets (measured at the time of each incurrence of any such Indebtedness), in either case outstanding at any time;

(5) the incurrence by Great Lakes or any of its Restricted Subsidiaries of Permitted Refinancing Indebtedness in exchange for, or the net proceeds of which are used to refund, refinance or replace Indebtedness (other than intercompany Indebtedness) that would have been permitted by the indenture to be incurred under the first paragraph hereof or clauses (2), (3), (5) and (14) of this paragraph;

(6) the incurrence by Great Lakes or any of its Restricted Subsidiaries of intercompany Indebtedness between or among Great Lakes and any of its Restricted Subsidiaries; provided, however , that (A) if Great Lakes is the obligor on this Indebtedness, the Indebtedness is expressly subordinated to the prior payment in full in cash of all Obligations with respect to the notes, (B) if any Guarantor is the obligor on this Indebtedness to a Restricted Subsidiary that is not a Guarantor, the Indebtedness is expressly subordinated to the prior payment in full in cash of all Obligations with respect to the Guarantee of such Guarantor and (C) (i) any subsequent issuance or transfer of Equity Interests that results in any Indebtedness being held by a Person other than Great Lakes or a Restricted Subsidiary and (ii) any sale or other transfer of any

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Indebtedness to a Person that is not either Great Lakes or a Restricted Subsidiary shall be deemed, in each case, to constitute an incurrence of Indebtedness by Great Lakes or the Restricted Subsidiary, as the case may be, that was not permitted by this clause (6);

(7) the incurrence by Great Lakes or any of its Restricted Subsidiaries of Hedging Obligations (other than for speculative purposes);

(8) the incurrence by Great Lakes or any of its Restricted Subsidiaries of Indebtedness (in addition to Indebtedness permitted by other clauses of this paragraph) in an aggregate principal amount (or accreted value, as applicable) at any time outstanding, including all Permitted Refinancing Indebtedness incurred to refund, refinance or replace any Indebtedness incurred pursuant to this clause (8), not to exceed $50.0 million;

(9) the guarantee by Great Lakes or any Restricted Subsidiary of Indebtedness of Great Lakes or a Restricted Subsidiary, which Indebtedness was permitted to be incurred by another provision of this covenant; provided that in the case of a guarantee by any Restricted Subsidiary that is not a Guarantor, such Restricted Subsidiary complies with the covenant described below under “—Limitation on Issuance of Guarantees of Indebtedness”;

(10) Indebtedness of Great Lakes or a Restricted Subsidiary owed to (including obligations in respect of letters of credit for the benefit of) any Person in connection with worker’s compensation, health, disability or other employee benefits or property, casualty or liability insurance provided by such Person to Great Lakes or the Restricted Subsidiary, pursuant to reimbursement or indemnification obligations to such Person, in each case incurred in the ordinary course of business and consistent with past practices;

(11) the incurrence of Permitted Bonding Obligations;

(12) the incurrence of Indebtedness arising from agreements of Great Lakes or any Restricted Subsidiary providing for indemnification, adjustment of purchase price or similar obligations, in each case, incurred or assumed in connection with the acquisition or disposition of any business, assets or Capital Stock of a Restricted Subsidiary; provided that with respect to any such disposition, the maximum aggregate liability of this Indebtedness shall at no time exceed the gross proceeds actually received by Great Lakes and its Restricted Subsidiaries in connection with any such disposition;

(13) the issuance by any of Great Lakes’ Restricted Subsidiaries to Great Lakes or to any of its Restricted Subsidiaries of shares of preferred stock; provided, however , that:

will be deemed, in each case, to constitute an issuance of such preferred stock by such Restricted Subsidiary that was not permitted by this clause (13);

(14) the incurrence by Great Lakes or any of its Restricted Subsidiaries of Indebtedness (in addition to Indebtedness permitted by other clauses of this paragraph) to finance the repurchase of the Designated Vessels, which are utilized at the time of incurrence by Great Lakes or a Restricted Subsidiary under operating leases, in each case on terms not materially less favorable on the whole than those set forth in the repurchase provisions contained in such operating leases as in effect as of the Issue Date;

(15) the guarantee by Great Lakes or a Restricted Subsidiary of Indebtedness of any entity which is not wholly owned by Great Lakes or any of its Restricted Subsidiaries; provided that the maximum liability of Great Lakes or a Restricted Subsidiary thereunder does not exceed $15.0 million at any time; and

(16) Indebtedness incurred as a result of the accounting for an extension of the term of any lease existing on the Issue Date as a capital lease under GAAP as a result of such extension.

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For purposes of determining compliance with this covenant, in the event that an item of Indebtedness meets the criteria of more than one of the categories of Permitted Debt described in clauses (1) through (16) above or is entitled to be incurred pursuant to the first paragraph of this covenant, Great Lakes shall, in its sole discretion, classify (or later reclassify in whole or in part, in its sole discretion) that item of Indebtedness in any manner that complies with this covenant. Accrual of interest, accretion or amortization of original issue discount, the payment of interest on any Indebtedness in the form of additional Indebtedness with the same terms, and the payment of dividends on Disqualified Stock in the form of additional shares of the same class of Disqualified Stock will not be deemed to be an incurrence of Indebtedness or an issuance of Disqualified Stock for purposes of this covenant; provided, that in each case, that the amount is included in Fixed Charges of Great Lakes as accrued. Notwithstanding any other provision of this covenant, the maximum amount of Indebtedness that Great Lakes or any Restricted Subsidiary may incur pursuant to this covenant shall not be deemed to be exceeded solely as a result of fluctuations in exchange rates or currency values. The principal amount of any Indebtedness supported by a letter of credit issued under a Credit Facility in accordance with clause (1) above shall not be deemed a separate incurrence of Indebtedness for purposes of this covenant, but only to the extent of the stated amount of such letter of credit.

The amount of any Indebtedness outstanding as of any date will be:

(1) the accreted valued of the Indebtedness in the case of any Indebtedness issued with original issue discount;

(2) the maximum fixed redemption liability with respect to any Disqualified Stock or preferred stock of a Restricted Subsidiary;

(3) the principal amount of the Indebtedness, in the case of any other Indebtedness; and

(4) in respect of Indebtedness of another Person secured by a Lien on the assets of the specified Person, the lesser of:

Limitation on Liens

Great Lakes will not, and will not permit any of its Restricted Subsidiaries to, directly or indirectly, create, incur, assume or suffer to exist any Lien securing Indebtedness or trade payables on any asset now owned or hereafter acquired, including any income or profits therefrom, except

Limitation on Dividends and Other Payment Restrictions Affecting Subsidiaries

Great Lakes will not, and will not permit any of its Restricted Subsidiaries to, directly or indirectly, create or otherwise cause or suffer to exist or become effective any encumbrance or restriction on the ability of any Restricted Subsidiary to:

(1) pay dividends or make any other distributions to Great Lakes or any of its Restricted Subsidiaries on its Capital Stock or with respect to any other interest or participation in, or measured by, its profits, or pay any Indebtedness or other liabilities owed to Great Lakes or any of its Restricted Subsidiaries;

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(2) make loans or advances to Great Lakes or any of its Restricted Subsidiaries; or

(3) transfer any of its properties or assets to Great Lakes or any of its Restricted Subsidiaries.

The first paragraph of this covenant will not apply to encumbrances or restrictions existing under or by reason of:

(1) Existing Indebtedness as in effect on the Issue Date;

(2) the Credit Agreement and Permitted Bonding Obligations as in effect as of the Issue Date, and any amendments, modifications, restatements, renewals, increases, supplements, refundings, replacements or refinancings, provided that any amendments, modifications, restatements, renewals, increases, supplements, refundings, replacement or refinancings are not materially more restrictive, taken as a whole, with respect to dividend and other payment restrictions than those contained in the Credit Agreement or in agreements with respect to Permitted Bonding Obligations, as applicable, as in effect on the Issue Date;

(3) the indenture, the notes (including the exchange notes) and the Guarantees (including the Guarantees of the exchange notes);

(4) applicable law, rule, regulation or order;

(5) any instrument governing Indebtedness or Capital Stock of a Person acquired by Great Lakes or any of its Restricted Subsidiaries as in effect at the time of acquisition (except to the extent the Indebtedness was incurred in connection with or in contemplation of the acquisition), which encumbrance or restriction is not applicable to any Person, or the properties or assets of any Person, other than the Person, or the property or assets of the Person, so acquired, provided that, in the case of Indebtedness, the Indebtedness was permitted by the terms of the indenture to be incurred;

(6) customary non-assignment provisions in leases, licenses, charters or other similar agreements entered into in the ordinary course of business;

(7) purchase money obligations for property acquired in the ordinary course of business that impose restrictions of the nature described in clause (3) of the first paragraph of this covenant on the property so acquired;

(8) any agreement for the sale of a Restricted Subsidiary that restricts distributions by that Restricted Subsidiary pending its sale;

(9) Permitted Refinancing Indebtedness, provided that the restrictions contained in the agreements governing Permitted Refinancing Indebtedness are not materially more restrictive, taken as a whole, than those contained in the agreements governing the Indebtedness being refinanced;

(10) secured Indebtedness otherwise permitted to be incurred pursuant to the provisions of the covenant described above under the caption “—Limitation on Incurrence of Indebtedness and Issuance of Disqualified Stock” and “—Limitation on Liens” that limits the right of the debtor to dispose of the assets (including any insurance, leases and charters relating to such assets, and any proceeds thereof) securing the Indebtedness;

(11) provisions with respect to the disposition or distribution of assets or property in joint venture agreements and other similar agreements entered into in the ordinary course of business;

(12) restrictions on cash or other deposits or net worth imposed by customers under contracts entered into in the ordinary course of business;

(13) mortgage, construction, purchase money or similar financings that impose restrictions on the transfer of the property acquired, constructed repaired or improved;

(14) encumbrances or restrictions imposed by amendments to the contracts, agreements or obligations referred to in the foregoing clauses (1), (3), (5), (6), (7), (8), (10), (11), (12) and (13), provided that the amendments are not materially more restrictive than the agreement so amended;

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(15) any other agreement, instrument or document relating to Indebtedness hereafter in effect, provided, that the terms and conditions of such encumbrances or restrictions are not materially more restrictive taken as a whole than those encumbrances or restrictions imposed in connection with the Credit Agreement as in effect on the Issue Date (which may result in encumbrances or restrictions upon a Restricted Subsidiary so long as such encumbrances or restrictions are not materially more restrictive taken as a whole than the comparable restriction that is applicable to Great Lakes); or

(16) encumbrances or restrictions contained in any Indebtedness incurred by a Foreign Subsidiary that apply only to such Foreign Subsidiary.

Limitation on Mergers, Consolidations or Sales of Assets

Great Lakes will not consolidate or merge with or into (whether or not Great Lakes is the surviving corporation), or sell, assign, transfer, convey or otherwise dispose of all or substantially all of its properties or assets in one or more related transactions, to another Person unless:

(1) Great Lakes is the surviving corporation or the entity or the Person formed by or surviving the consolidation or merger (if other than Great Lakes) or to which the sale, assignment, transfer, lease, conveyance or other disposition shall have been made is a corporation, limited liability company or partnership organized or existing under the laws of the United States, any individual state or the District of Columbia; provided, however, that if such Person is a limited liability company or partnership, a corporate Wholly-Owned Restricted Subsidiary of such Person becomes a co-issuer of the notes in connection therewith;

(2) the entity or Person formed by or surviving any consolidation or merger (if other than Great Lakes) or the entity or Person to which the sale, assignment, transfer, lease, conveyance or other disposition shall have been made assumes all the then existing obligations of Great Lakes under the Registration Rights Agreement, the notes and the indenture pursuant to a supplemental indenture in the form contemplated by the indenture and otherwise reasonably satisfactory to the trustee;

(3) immediately after the transaction no Default or Event of Default exists; and

(4) except in the case of a merger or consolidation of Great Lakes with or into a Wholly Owned Subsidiary of Great Lakes, Great Lakes or the Person formed by or surviving the consolidation or merger (if other than Great Lakes), or to which the sale, assignment, transfer, lease, conveyance or other disposition shall have been made will, at the time of the transaction and after giving pro forma effect to it as if the transaction had occurred at the beginning of the applicable four-quarter period, (A) be permitted to incur at least $1.00 of additional Indebtedness pursuant to the Fixed Charge Coverage Ratio test set forth in the first paragraph of the covenant described above under the caption “—Limitation on Incurrence of Indebtedness and Issuance of Disqualified Stock” or (B) have a Fixed Charge Coverage Ratio that is greater than the Fixed Charge Coverage Ratio of Great Lakes without giving effect to the transaction.

Great Lakes will not, directly or indirectly, lease all or substantially all of its properties or assets to any Person. This “Merger, Consolidation or Sale of Assets” covenant will not apply to any sale, assignment, transfer, conveyance or other disposition of assets (including by way of merger or consolidation) between or among Great Lakes and any of its Wholly Owned Restricted Subsidiaries that are Guarantors.

Upon any consolidation or merger, or any sale, assignment, transfer, conveyance or other disposition by Great Lakes (other than by lease) of all or substantially all of the properties and assets of Great Lakes, in accordance with this covenant, the successor Person formed by such consolidation or into which Great Lakes is merged or to which such transfer is made shall succeed to, and be substituted for, and may exercise every right and power of, Great Lakes under the indenture and the notes. In the event of any such transfer (other than a transfer of less than all of the properties and assets of Great Lakes), Great Lakes shall be released and discharged from all liabilities and obligations in respect of the notes and the indenture, and Great Lakes may be dissolved, wound up or liquidated at any time thereafter.

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Limitation on Transactions with Affiliates

Great Lakes will not, and will not permit any of its Restricted Subsidiaries to, make any payment to, or sell, lease, transfer or otherwise dispose of any of its properties or assets to, or purchase any property or assets from, or enter into or make or amend any transaction, contract, agreement, understanding, loan, advance or guarantee with, or for the benefit of, any Affiliate, each, an “Affiliate Transaction,” unless:

(1) the Affiliate Transaction is on terms that are no less favorable to Great Lakes or the relevant Restricted Subsidiary than those that would have been obtained in a comparable transaction by Great Lakes or the Restricted Subsidiary with an unrelated Person, and

(2) Great Lakes delivers to the trustee:

Notwithstanding the preceding provisions of this covenant, the following items shall not be deemed to be Affiliate Transactions:

(1) any employment agreement, compensation, employee benefit arrangements and incentive arrangements or indemnification agreement or arrangement with any officer, director, member or employee entered into by Great Lakes or any of its Restricted Subsidiaries in the ordinary course of business of Great Lakes or the Restricted Subsidiary;

(2) transactions between or among Great Lakes and/or its Restricted Subsidiaries;

(3) payment of reasonable directors fees and customary indemnification agreements with directors and officers of Great Lakes and its Restricted Subsidiaries or any direct or indirect parent of Great Lakes;

(4) Restricted Payments that are permitted by the provisions of the indenture described above under the caption “—Restricted Payments”;

(5) loans and advances to officers, directors and employees of Great Lakes or any Restricted Subsidiary for travel, entertainment, moving and other relocation expenses, in each case made in the ordinary course of business;

(6) transactions with a Person (other than an Unrestricted Subsidiary of Great Lakes) that is an Affiliate of Great Lakes solely because Great Lakes owns, directly or through a Restricted Subsidiary, an Equity Interest in, or controls, such Person;

(7) the issuance of Equity Interests (other than Disqualified Stock) of Great Lakes to any direct or indirect parent of Great Lakes;

(8) transactions with customers, clients, suppliers or purchasers or sellers of goods or services, in each case in the ordinary course of business and otherwise in compliance with the terms of the indenture that are on terms no less favorable than those that would have been obtained in a comparable transaction with an unrelated party or on terms that are approved by the Board of Directors of Great Lakes, including a majority of the disinterested directors, if any;

(9) transactions pursuant to any contract or agreement described under the caption “Certain Relationships and Related Person Transactions—Agreements with Related Persons” in Great Lakes’ Proxy

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Statement on Form DEF 14A as filed with the Commission on April 6, 2010, as in effect on the Issue Date, in each case as amended, modified or replaced from time to time so long as the amended, modified or new agreements, taken as a whole, are no less favorable to Great Lakes and its Restricted Subsidiaries than those in effect on the Issue Date; and

(10) any payments or other transactions pursuant to any tax-sharing agreement between Great Lakes and any other Person with which Great Lakes files a consolidated tax return or with which Great Lakes is part of a consolidated group for tax purposes.

Limitation on Business Activities

Great Lakes will not, and will not permit any Restricted Subsidiary to, engage in any business other than Permitted Businesses, except to the extent as would not be material to Great Lakes and its Restricted Subsidiaries taken as a whole.

Limitation on Payments for Consent

Neither Great Lakes nor any of its Restricted Subsidiaries will, directly or indirectly, pay or cause to be paid any consideration, whether by way of interest, fee or otherwise, to any holder of any notes for or as an inducement to any consent, waiver or amendment of any of the terms or provisions of the indenture or the notes unless the consideration is offered to be paid or is paid to all holders of the notes that consent, waive or agree to amend in the time frame set forth in the solicitation documents relating to the consent, waiver or agreement.

Limitations on Issuances of Guarantees of Indebtedness

Great Lakes will cause any Restricted Subsidiary (other than an Excluded Subsidiary), whether currently existing, or subsequently acquired or created, that guarantees Great Lakes’ Obligations or the Obligations of any other Restricted Subsidiary under the Credit Agreement to fully and unconditionally guarantee all of Great Lakes’ or such Restricted Subsidiary’s Obligations under the notes and the indenture on the terms set forth in the indenture. Thereafter, such Restricted Subsidiary shall be a Guarantor for all purposes of the indenture until released in accordance with the terms of the indenture. Any such Guarantee shall provide by its terms that it shall be automatically and unconditionally released and discharged as described above under “—Limitation on Guarantees.”

Reports

Whether or not required by the rules and regulations of the Commission, so long as any notes are outstanding, Great Lakes will file with the Commission (unless the Commission will not accept such filing) and furnish to the trustee and the holders of notes:

(1) all quarterly and annual financial and other information that would be required to be contained in a filing with the Commission on Forms 10-Q and 10-K if Great Lakes was required to file these Forms, including a “Management’s Discussion and Analysis of Financial Condition and Results of Operations” that describes the financial condition and results of operations of Great Lakes and its consolidated Subsidiaries (showing in reasonable detail, either on the face of the financial statements or in the footnotes, the financial condition and results of operations of Great Lakes and its Restricted Subsidiaries separate from the financial condition and results of operations of the Unrestricted Subsidiaries of Great Lakes) and, with respect to the annual information only, a report thereon by Great Lakes’ certified independent accountants; and

(2) all current reports that would be required to be filed with the Commission on Form 8-K if Great Lakes were required to file these reports, in each case within the time periods specified in the Commission’s rules and regulations;

provided , however , that Great Lakes will not be required to furnish such information to the trustee or the registered holders of the notes to the extent such information is electronically filed with the Commission and is electronically available to the public free of cost.

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In addition, (1) at all times the Commission does not accept the filings provided for in the preceding sentence or (2) the filings provided for in the preceding sentence do not contain the information required to be delivered upon request pursuant to Rule 144A(d)(4) under the Securities Act, then, in each case, Great Lakes has agreed that, for so long as any notes remain outstanding, it will furnish to the holders and to securities analysts and prospective investors, upon their request, the information required to be delivered pursuant to Rule 144A(d)(4) under the Securities Act.

Events of Default and Remedies

The indenture provides that each of the following constitutes an “Event of Default”:

(1) default for 30 days in the payment when due of interest on, or Additional Interest with respect to, the notes;

(2) default in payment when due of the principal of or premium, if any, on the notes;

(3) failure by Great Lakes or any of its Restricted Subsidiaries to comply with the provisions described under the caption “—Repurchase at the Option of Holders—Change of Control”;

(4) failure by Great Lakes 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;

(5) 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 Great Lakes or any of its Restricted Subsidiaries (or the payment of which is guaranteed by Great Lakes or any of its Restricted Subsidiaries) whether the Indebtedness or guarantee now exists, or is created after the Issue Date, which default

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;

(6) failure by Great Lakes 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;

(7) certain events of bankruptcy or insolvency with respect to Great Lakes or any of its Significant Subsidiaries; and

(8) 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.

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 immediately. Notwithstanding the foregoing, in the case of an Event of Default arising from certain events of bankruptcy or insolvency, with respect to Great Lakes, any Significant Subsidiary or any group of Subsidiaries that, taken

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together, would constitute a Significant Subsidiary, all outstanding notes will become due and payable without further action or notice. Holders of the notes may not enforce the indenture or the notes except as provided in the indenture.

Subject to certain limitations, holders of a majority in principal amount of the then outstanding notes may direct the trustee in its exercise of any trust or power. However, the trustee may refuse to follow any direction that conflicts with law or the indenture, that may involve the trustee in personal liability, or that the trustee determines in good faith may be unduly prejudicial to the rights of holders of notes not joining in the giving of such direction, and may take any other action it deems proper that is not inconsistent with any such direction received from holders of a majority in principal amount of notes. The trustee may withhold from holders of the notes notice of any continuing Default or Event of Default (except a Default or Event of Default relating to the payment of principal or interest) if it determines that withholding notice is in their interest.

In the event of a declaration of acceleration of the notes because an Event of Default has occurred and is continuing as a result of the acceleration of any Indebtedness described in clause (5) of the first paragraph of this section (excluding any resulting payment default under the indenture or the notes), the declaration of acceleration of the notes shall be automatically annulled if the holders of all Indebtedness described in such clause (5) have rescinded the declaration of acceleration in respect of such Indebtedness within 20 days of the date of such declaration, and if the annulment of the acceleration of the notes would not conflict with any judgment or decree of a court of competent jurisdiction, and all existing Events of Default, except non-payment of principal or interest on the notes that became due solely because of the acceleration of the notes, have been cured or waived.

The holders of 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 the payment of interest on, or the principal of, premium or Additional Interest, if any, on the notes. The holders of a majority in principal amount of the outstanding notes by written notice to Great Lakes and to the trustee may waive all past defaults and rescind and annul a declaration of acceleration and its consequences if:

(1) all existing Events of Default, other than the nonpayment of the principal of, premium, or Additional Interest if any, and interest on the notes that have become due solely by the declaration of acceleration, have been cured or waived; and

(2) the rescission would not conflict with any judgment or decree of a court of competent jurisdiction.

A holder may not institute any proceeding, judicial or otherwise, with respect to the indenture or the notes, or for the appointment of a receiver or trustee, or for any other remedy under the indenture or the notes, unless:

(1) the holder has previously given to the trustee written notice of a continuing Event of Default;

(2) holders of at least 25% in aggregate principal amount of outstanding notes have made written request to the trustee to institute proceedings in respect of the Event of Default in its own name as trustee under the indenture;

(3) holders have offered to the trustee indemnity reasonably satisfactory to the trustee against any costs, liabilities or expenses to be incurred in compliance with such request;

(4) the trustee for 60 days after its receipt of such notice, request and offer of indemnity has failed to institute any such proceeding; and

(5) during such 60-day period, the holders of a majority in aggregate principal amount of the outstanding notes have not given the trustee a direction that is inconsistent with such written request.

Notwithstanding anything to the contrary, the right of a holder of a note to receive payment of principal of or interest on its note on or after the Stated Maturity thereof, or to bring suit for the enforcement of any such payment on or after such dates, may not be impaired or affected without the consent of that holder.

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Great Lakes is required to deliver to the trustee annually a statement regarding compliance with the indenture, and Great Lakes is required upon becoming aware of any Default or Event of Default, to deliver to the trustee a statement specifying the Default or Event of Default.

No Personal Liability of Directors, Officers, Employees and Stockholders

No director, officer, employee, incorporator or stockholder of Great Lakes shall have any liability for any obligations of Great Lakes under the notes, the indenture or the Guarantees or for any claim based on, in respect of, or by reason of, such obligations or their creation. Each holder of notes by accepting a note waives and releases all such liability. The waiver and release are part of the consideration for issuance of the notes. Such waiver may not be effective to waive liabilities under the federal securities laws and it is the view of the Commission that this type of waiver is against public policy.

Legal Defeasance and Covenant Defeasance

Great Lakes may, at its option and at any time, elect to have all of its obligations discharged with respect to the outstanding notes and all obligations of the Guarantors discharged with respect to their Guarantees (“Legal Defeasance”) except for:

(1) the rights of holders of outstanding notes to receive payments in respect of the principal of, or interest or premium and Additional Interest, if any, on such notes when such payments are due from the trust referred to below;

(2) Great Lakes’ obligations with respect to the notes concerning issuing temporary notes, registration of notes, mutilated, destroyed, lost or stolen notes and the maintenance of an office or agency for payment and money for security payments held in trust;

(3) the rights, powers, trusts, duties and immunities of the trustee, and Great Lakes’ and the Guarantors’ obligations in connection therewith; and

(4) the Legal Defeasance provisions of the indenture.

In addition, Great Lakes may, at its option and at any time, elect to have the obligations of Great Lakes and the Guarantors released with respect to certain covenants that are described in the indenture (“Covenant Defeasance”) and thereafter any omission to comply with those covenants will not constitute a Default or Event of Default with respect to the notes. In the event Covenant Defeasance occurs, certain events (not including non-payment, bankruptcy, receivership, rehabilitation and insolvency events) described under “Events of Default and Remedies” will no longer constitute an Event of Default with respect to the notes.

In order to exercise either Legal Defeasance or Covenant Defeasance:

(1) Great Lakes must irrevocably deposit with the trustee, in trust, for the benefit of the holders of the notes, cash in U.S. dollars, non-callable Government Securities, or a combination of cash in U.S. dollars and non-callable Government Securities, in amounts as will be sufficient, in the opinion of a nationally recognized firm of independent public accountants, expressed in a written certification thereof delivered to the trustee, to pay the principal of, and interest and premium and Additional Interest, if any, on, the outstanding notes on the stated maturity or on the applicable redemption date, as the case may be, and Great Lakes must specify whether the notes are being defeased to maturity or to a particular redemption date;

(2) in the case of Legal Defeasance, Great Lakes has delivered to the trustee an opinion of counsel reasonably acceptable to the trustee confirming that (a) Great Lakes has received from the Internal Revenue Service a ruling directed to it or (b) since the Issue Date, there has been a change in the applicable federal income tax law (including by reason of a published ruling from the Internal Revenue Service), in either case to the effect that, and based thereon such opinion of counsel will confirm that, the holders of the outstanding notes will not recognize income, gain or loss for federal income tax purposes as a result of such Legal

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Defeasance and will be subject to federal income tax on the same amounts, in the same manner and at the same times as would have been the case if such Legal Defeasance had not occurred;

(3) in the case of Covenant Defeasance, Great Lakes has delivered to the trustee an opinion of counsel reasonably acceptable to the trustee confirming that the holders of the outstanding notes will not recognize income, gain or loss for federal income tax purposes as a result of such Covenant Defeasance and will be subject to federal income tax on the same amounts, in the same manner and at the same times as would have been the case if such Covenant Defeasance had not occurred;

(4) no Default or Event of Default has occurred and is continuing on the date of such deposit (other than a Default or Event of Default resulting from the borrowing of funds to be applied to such deposit);

(5) such Legal Defeasance or Covenant Defeasance will not result in a breach or violation of, or constitute a default under any material agreement or instrument (other than the indenture) to which Great Lakes or any of its Subsidiaries is a party or by which Great Lakes or any of its Subsidiaries is bound;

(6) Great Lakes must deliver to the trustee an officers’ certificate stating that the deposit was not made by Great Lakes with the intent of preferring the holders of notes over the other creditors of Great Lakes with the intent of defeating, hindering, delaying or defrauding creditors of Great Lakes or others; and

(7) Great Lakes must deliver to the trustee an officers’ certificate and an opinion of counsel, each stating that all conditions precedent relating to the Legal Defeasance or the Covenant Defeasance have been complied with.

Amendment, Supplement and Waiver

Except as provided in the next two succeeding paragraphs, the indenture, the Guarantees or the notes may be amended or supplemented with the consent of the holders of at least a majority in principal amount of the notes then outstanding (including, without limitation, consents obtained in connection with a purchase of, or tender offer or exchange offer for, notes), and any existing Default or compliance with any provision of the indenture, the notes or the Guarantees may be waived with the consent of the holders of a majority in principal amount of the then outstanding notes (including, without limitation, consents obtained in connection with a purchase of, or tender offer or exchange offer for, notes).

Without the consent of each holder affected, an amendment or waiver may not (with respect to any notes held by a non-consenting holder):

(1) reduce the principal amount of notes whose holders must consent to an amendment, supplement or waiver;

(2) reduce the principal of or change the fixed maturity of any note or alter the provisions with respect to the redemption or repurchase of the notes (other than provisions relating to the covenants described above under the caption “—Repurchase at the Option of Holders”);

(3) reduce the rate of or change the time for payment of interest on any note;

(4) waive a Default or Event of Default in the payment of principal of or premium or Additional Interest, if any, or interest on the notes (except a rescission of acceleration of the notes by the holders of at least a majority in aggregate principal amount of the notes and a waiver of the payment default that resulted from the acceleration);

(5) make any note payable in money other than that stated in the notes;

(6) make any change in the provisions of the indenture relating to waivers of past Defaults or the rights of holders of notes to receive payments of principal of or premium, if any, or interest on the notes;

(7) waive a redemption or repurchase payment with respect to any note (other than a payment required by one of the covenants described above under the caption “—Repurchase at the Option of Holders”);

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(8) release any Guarantor from any of its obligations under its Guarantee or the indenture, except in accordance with the terms of the indenture;

(9) expressly subordinate in right of payment the notes or any Guarantee to any other Indebtedness of Great Lakes or any Guarantor; or

(10) make any change in the foregoing amendment and waiver provisions.

Notwithstanding the foregoing, without the consent of any holder of notes, the Guarantors, Great Lakes and the trustee may amend or supplement the indenture, the Guarantees or the notes:

(1) to cure any ambiguity, defect or inconsistency;

(2) to provide for uncertificated notes in addition to or in place of certificated notes;

(3) to provide for the assumption of Great Lakes’ 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 Great Lakes’ assets that is permitted by the indenture;

(4) to provide for the issuance of additional notes in accordance with the provisions set forth in the indenture on the Issue Date;

(5) 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;

(6) to comply with requirements of the Commission in order to effect or maintain the qualification of the indenture under the Trust Indenture Act;

(7) to allow any Guarantor to guarantee the notes; or

(8) to conform any provision of the indenture to this “Description of Notes.”

Satisfaction and Discharge

The indenture will be discharged and will cease to be of further effect as to all notes issued thereunder, when:

(1) either:

(a) all notes that have been authenticated, except lost, stolen or destroyed notes that have been replaced or paid and notes for whose payment money has been deposited in trust and thereafter repaid to Great Lakes, have been delivered to the trustee for cancellation; or

(b) all notes that have not been delivered to the trustee for cancellation have become due and payable by reason of the mailing of a notice of redemption or otherwise or will become due and payable within one year, and Great Lakes has irrevocably deposited or caused to be deposited with the trustee as trust funds in trust solely for the benefit of the holders, cash in U.S. dollars, non-callable Government Securities, or a combination of cash in U.S. dollars and non-callable Government Securities, in such amounts as will be sufficient without consideration of any reinvestment of interest, to pay and discharge the entire Indebtedness on the notes not delivered to the trustee for cancellation for principal, premium and Additional Interest, if any, and accrued interest to the date of maturity or redemption;

(2) no Default or Event of Default has occurred and is continuing on the date of the deposit or will occur as a result of the deposit and the deposit will not result in a breach or violation of, or constitute a default under, any other instrument to which Great Lakes or any Guarantor is a party or by which Great Lakes or any Guarantor is bound;

(3) Great Lakes has paid or caused to be paid all sums payable by it under the indenture; and

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(4) Great Lakes has delivered irrevocable instructions to the trustee under the indenture to apply the deposited money toward the payment of the notes at maturity or the redemption date, as the case may be.

In addition, Great Lakes must deliver an officers’ certificate and an opinion of counsel to the trustee stating that all conditions precedent to satisfaction and discharge have been satisfied.

Concerning the Trustee

The indenture contains limitations set forth in the Trust Indenture Act on the rights of the trustee, should it become a creditor of Great Lakes, to obtain payment of claims in certain cases, or to realize on property received in respect of any claim as security or otherwise. The trustee will be permitted to engage in other transactions; however, if it acquires any conflicting interest as defined by the Trust Indenture Act it must eliminate the conflict within 90 days, apply to the Commission for permission to continue or resign.

The holders of a majority in principal amount of the then outstanding notes will have the right to direct the time, method and place of conducting any proceeding for exercising any remedy available to the trustee, subject to exceptions defined in the indenture. The indenture will provide that in case an Event of Default shall occur (which shall not be cured or waived), the trustee will be required, in the exercise of the rights and powers vested in it by the indenture, to use the degree of care and skill in their exercise of a prudent man in the conduct of his own affairs under the circumstances. Subject to these provisions, the trustee will be under no obligation to exercise any of its rights or powers under the indenture at the direction or request of any holder of notes, unless the holder shall have offered to the trustee security and indemnity satisfactory to it against any loss, liability or expense.

Methods of Receiving Payments on the Notes

All principal, premium and Additional Interest, if any, and interest on the notes will be payable at the office or agency of Great Lakes maintained for this purpose within or without the City and State of New York or, at the option of Great Lakes, payment of principal, premium, interest and Additional Interest, if any, may be made by check mailed to the holders of the notes at their respective addresses set forth in the register of holders of notes; provided that all payments of principal, premium, interest and Additional Interest, if any, with respect to notes the holders of which have given wire transfer instructions to Great Lakes will be required to be made by wire transfer of immediately available funds to the accounts specified by the holders of the notes. Until otherwise designated by Great Lakes, Great Lakes’ office or agency will be the office of the trustee maintained for this purpose. Under the indenture, Great Lakes and the trustee will treat the Person in whose name the notes are registered as a holder. Consequently, an owner of a beneficial interest in a global note will not be considered a holder under the indenture.

Paying Agent and Registrar for the Notes

The trustee under the indenture initially will be the paying agent and registrar with regard to the notes. Great Lakes may change the paying agent or registrar without prior notice to the holders of the notes, and Great Lakes or any of its Subsidiaries may act as paying agent or registrar.

Transfer and Exchange

A holder may transfer or exchange notes in accordance with the indenture. The registrar and the trustee may require a holder to furnish appropriate endorsements and transfer documents in connection with a transfer of notes. Holders will be required to pay all taxes due on transfer. Great Lakes is not required to transfer or exchange any note selected for redemption. Also, Great Lakes is not required to transfer or exchange any note for a period of 15 days before a selection of notes to be redeemed.

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Certain Definitions

Set forth below are certain defined terms used in the indenture.

“ Acquired Debt ” means, with respect to any specified Person:

“ Additional Interest ” means all additional interest then owing pursuant to the Registration Rights Agreement.

“ Affiliate ” of any specified Person means any other Person directly or indirectly controlling or controlled by or under direct or indirect common control with the specified Person. For purposes of this definition, “control” (including, with correlative meanings, the terms “controlling,” “controlled by” and “under common control with”), as used with respect to any Person, shall mean the possession, directly or indirectly, of the power to direct or cause the direction of the management or policies of such Person, whether through the ownership of voting securities, by agreement or otherwise; provided that beneficial ownership of 10% or more of the Voting Stock of a Person shall be deemed to be control.

“ Applicable Premium ” means, with respect to any note on any Redemption Date, the greater of:

(1) 1.0% of the principal amount of such note; and

(2) the excess, if any, of (a) the present value at such Redemption Date of (i) the redemption price of such note at February 1, 2015 (such redemption price being set forth in the table appearing above under the caption “Optional Redemption”), plus (ii) all required interest payments due on such note through February 1, 2015 (excluding accrued but unpaid interest to the Redemption Date), computed using a discount rate equal to the Treasury Rate as of such Redemption Date plus 50 basis points; over (b) then outstanding principal amount of such note.

“ Asset Sale ” means

(1) the sale, lease, conveyance or other disposition of any assets or rights (including, without limitation, by way of a sale and leaseback) other than sales of inventory in the ordinary course of business consistent with past practices (provided that the sale, conveyance or other disposition of all or substantially all of the assets of Great Lakes and its Subsidiaries, taken as a whole, will be governed by the provisions of the indenture described above under the caption “—Repurchase at the Option of Holders—Change of Control” and/or the provisions described above under the caption “—Mergers, Consolidations or Sales of Assets” and not by the provisions of the “—Repurchase at the Option of Holders—Asset Sales” covenant), and

(2) the issue or sale by any Restricted Subsidiary of Equity Interests of any of Great Lakes’ Subsidiaries,

in the case of either clause (1) or (2), whether in a single transaction or a series of related transactions (A) that involve assets or Equity Interests that have a Fair Market Value in excess of $5.0 million or (B) for Net Proceeds in excess of $5.0 million. Notwithstanding the foregoing, the following items shall not be deemed to be Asset Sales:

(1) a transfer of assets by Great Lakes to a Restricted Subsidiary or by a Restricted Subsidiary to Great Lakes or to another Restricted Subsidiary;

(2) an issuance, sale, transfer or other disposition of Equity Interests by a Restricted Subsidiary to Great Lakes or to another Restricted Subsidiary;

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(3) a Restricted Payment that is permitted by the covenant described above under the caption “—Restricted Payments,” or a Permitted Investment;

(4) the sale and leaseback of any assets within 180 days of the date of acquisition or completion of construction of such assets;

(5) the sale or other disposition of assets that have become worn out, obsolete or damaged or no longer used or useful in the business of Great Lakes or any Restricted Subsidiary, as the case may be, in the ordinary course of business;

(6) bareboat charters, leases or licenses entered into in the ordinary course of business for a term not to exceed 12 months;

(7) the sale or other disposition of cash or Cash Equivalents;

(8) the sale or lease of products or services or the licensing of intellectual property, in each case in the ordinary course of business;

(9) the sale for Fair Market Value of accounts receivable that are generated from operations conducted outside the United States by Great Lakes or any Restricted Subsidiary; and

(10) the creation of a Permitted Lien and dispositions in connection with the creation of Permitted Liens.

“ Bonding Agreement ” means (i) the Third Amended and Restated Underwriting and Continuing Indemnity Agreement by and among Great Lakes, certain of its Subsidiaries and Travelers Casualty and Surety Company and Travelers Casualty and Surety Company of America, and (ii) the International Letter of Credit Agreement, dated September 29, 2006, by and among Great Lakes Dredge & Dock Corporation and Wells Fargo HSBC Trade Bank, as amended on July 16, 2007, and as further amended on September 29, 2009 (the “ International Letter of Credit Facility ”) (and any related obligations, including, without limitation, any Export-Import Bank guarantee program), in each case, including any related notes, guarantees, collateral documents, instruments and agreements executed in connection therewith, as amended, restated, modified, renewed, refunded, replaced or refinanced in whole or in part from time to time.

“ Capital Lease Obligation ” means, at the time any determination of a capital lease obligation is to be made, the amount of the liability in respect of a capital lease that would at such time be required to be capitalized on a balance sheet in accordance with GAAP.

“ Capital Stock ” means

(1) in the case of a corporation, corporate stock,

(2) in the case of an association or business entity, any and all shares, interests, participations, rights or other equivalents (however designated) of corporate stock,

(3) in the case of a partnership or limited liability company, partnership or membership interests (whether general or limited); and

(4) any other interest or participation that confers on a Person the right to receive a share of the profits and losses of, or distributions of assets of, the issuing Person.

“ Cash Equivalents ” means

(1) United States dollars or money in other currencies received in the ordinary course of business;

(2) obligations issued or guaranteed by the United States government or any agency of the United States (provided that the full faith and credit of the United States is pledged in support) having maturities of not more than one year from the date of acquisition;

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(3) certificates of deposit and eurodollar time deposits with maturities of one year or less from the date of acquisition, bankers’ acceptances with maturities not exceeding one year and overnight bank deposits, in each case with any commercial bank having capital and surplus in excess of $500 million;

(4) repurchase obligations with a term of not more than thirty days for underlying securities of the types described in clauses (2) and (3) above entered into with any institution meeting the qualifications specified in clause (3) above;

(5) obligations issued by any state of the United States of America or any political subdivision of any such state maturing within one year from the date of acquisition and, at the time of acquisition, having one of the two highest ratings obtainable from either Standard & Poor’s Corporation (“S&P”) or Moody’s Investors Service, Inc. (“Moody’s”);

(6) commercial paper having one of the two highest ratings obtainable from Moody’s or S&P and in each case maturing within one year after the date of acquisition;

(7) money market funds at least 95% of the assets of which constitute Cash Equivalents of the kinds described in clauses (1) through (6) of this definition;

(8) short-term asset management accounts offered by any lender under Credit Facilities for the purpose of investing in notes issued by a corporation (other than Great Lakes or any Affiliate of Great Lakes) organized under the laws of any state of the United States or of the District of Columbia and rated A–2 or higher by S&P, or P-2 or higher by Moody’s;

(9) securities with maturities of one year or less from the date of acquisition issued or fully and unconditionally guaranteed by any state, commonwealth or territory of the United States of America or the federal government of Canada, or by any political subdivision or taxing authority thereof, and having one of the two highest ratings obtainable from S&P or Moody’s;

(10) time or demand deposits with any bank or trust company;

(11) participation in loans made to a borrower (other than an Affiliate of Great Lakes) with a debt rating of A–2 or higher from S&P, or P-2 or higher from Moody’s; provided, however, that such loans must mature within one year from the date such participation is purchased;

(12) bonds issued by a municipality or governmental agency and rated not lower than BBB by S&P, or Baa2 by Moody’s and purchased by Great Lakes or any of its Subsidiaries in the ordinary course of its business in connection with retainage under contracts with its customers; and

(13) in the case of Foreign Subsidiaries, short term investments comparable to the foregoing.

“ Change of Control ” means the occurrence of any of the following:

(1) the sale, lease, transfer, conveyance or other disposition (other than by way of merger or consolidation), in one or a series of related transactions, of all or substantially all of the assets of Great Lakes and its Subsidiaries (determined on a consolidated basis), in each case, to any “person” (as that term is used in Section 13(d)(3) of the Exchange Act) other than Great Lakes or a Wholly Owned Restricted Subsidiary of Great Lakes;

(2) the adoption of a plan relating to the liquidation or dissolution of Great Lakes (other than in a transaction which complies with the provisions described under “—Mergers, Consolidations or Sales of Assets”);

(3) the consummation of any transaction (including, without limitation, any merger or consolidation) the result of which is that any “person” (as defined above) becomes the “beneficial owner” (as that term is defined in Rule 13d-3 and Rule 13d-5 under the Exchange Act, except that a person shall be deemed to have “beneficial ownership” of all securities that person has the right to acquire, whether the right is currently exercisable or is exercisable only upon the occurrence of a subsequent condition), directly or indirectly, of more than 50% of the Voting Stock of Great Lakes (measured by voting power rather than number of shares); or

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(4) the first day on which a majority of the members of the Board of Directors of Great Lakes are not Continuing Directors.

The definition of Change of Control includes a phrase relating to the sale, lease, transfer, conveyance, or other disposition of “all or substantially all” of the assets of Great Lakes and its Subsidiaries (determined on a consolidated basis). Although there is a developing body of case law interpreting the phrase “substantially all,” there is no precise established definition of the phrase under New York law, which is the law governing the indenture. Accordingly, the ability of a holder of notes to require Great Lakes to repurchase notes as a result of a sale, lease, transfer, conveyance or other disposition of less than all of the assets of Great Lakes and its Subsidiaries taken as a whole to another Person or group may be uncertain.

“ Commission ” means the Securities and Exchange Commission, as from time to time constituted, created under the Securities Exchange Act of 1934, as amended, or if at any time after the execution and delivery of the indenture such Commission is not existing and performing the duties now assigned to it under the Trust Indenture Act, then the body performing such duties on such date.

“ Consolidated Cash Flow ” means, with respect to any Person for any period, the Consolidated Net Income of such Person for such period plus

(1) an amount equal to any extraordinary or nonrecurring loss (including any loss on extinguishment or conversion of Indebtedness) plus any net loss realized in connection with an Asset Sale (without giving effect to the $5.0 million threshold provided in the definition thereof), to the extent those losses were deducted in computing the Consolidated Net Income, plus

(2) provision for taxes based on income or profits of such Person and its Restricted Subsidiaries for such period, to the extent that such provision for taxes was deducted in computing the Consolidated Net Income, plus

(3) consolidated Fixed Charges to the extent that any such Fixed Charges were deducted in computing the Consolidated Net Income, plus

(4) depreciation, amortization (including amortization of goodwill and other intangibles but excluding amortization of prepaid cash expenses that were paid in a prior period) and other non-cash items (excluding any non-cash item to the extent that it represents an accrual of or reserve for cash expenses in any future period or amortization of a prepaid cash expense that was paid in a prior period) of such Person and its Restricted Subsidiaries for such period to the extent that such depreciation, amortization and other non-cash items were deducted in computing the Consolidated Net Income, minus

(5) non-cash items increasing the Consolidated Net Income for such period other than (A) accrual of revenue in the ordinary course of business and (B) reversals of prior accruals or reserves for cash items previously excluded from Consolidated Cash Flow pursuant to clause (4) of this definition,

in each case, on a consolidated basis and determined in accordance with GAAP.

“ Consolidated Net Income ” means, with respect to any Person for any period, the aggregate of the Net Income of such Person and its Restricted Subsidiaries for such period, on a consolidated basis, determined in accordance with GAAP; provided that

(1) the Net Income of any Person that is not a Restricted Subsidiary or that is accounted for by the equity method of accounting shall be included only to the extent of the amount of dividends or distributions paid in cash to the referent Person or its Restricted Subsidiary;

(2) the Net Income of any Restricted Subsidiary shall be excluded to the extent that the declaration or payment of dividends or similar distributions by that Restricted Subsidiary of that Net Income is not at the date of determination permitted without any prior governmental approval (that has not been obtained) or,

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directly or indirectly, by operation of the terms of its charter or any agreement, instrument, judgment, decree, order, statute, rule or governmental regulation applicable to that Restricted Subsidiary or its stockholders;

(3) the cumulative effect of a change in accounting principles shall be excluded,

(4) the Net Income of any Unrestricted Subsidiary shall be excluded, whether or not distributed to Great Lakes or one of its Subsidiaries,

(5) any non-cash goodwill or other intangible asset impairment charges incurred subsequent to the Issue Date resulting from the application of ASC Topic 350, “Intangibles-Goodwill and Other,” ASC Topic 360, “Property, Plant and Equipment” and ASC Topic 805, “Business Combinations” or any related subsequent statement of financial accounting standards shall be excluded;

(6) any non-cash compensation charges, including any such charges arising from stock options, restricted stock grants or other equity-incentive programs shall be excluded;

(7) any increase in amortization or depreciation expense or any one-time non-cash charges resulting from purchase accounting or any non-recurring costs and expenses incurred in connection with the 2003 Transactions, the acquisition of L.W. Matteson, Inc. and the transactions related thereto, or any acquisition that is consummated after the Issue Date shall be excluded;

(8) any fees, expenses and debt issuance costs paid in connection with issuance of the notes shall be excluded;

(9) the Net Income from any disposed or discontinued operations or any net gains or losses on disposed or discontinued operations, on an after tax basis, shall be excluded;

(10) the non-cash gains, losses, income, and expenses resulting from fair value accounting required by ASC Topic 815, “Derivatives and Hedging” or any related subsequent statement of financial accounting standards shall be excluded; and

(11) any net unrealized gain or loss (after any offsets) resulting from any foreign currency translation shall be excluded.

“ Continuing Directors ” means, as of any date of determination, any member of the Board of Directors of Great Lakes who (1) was a member of the Board of Directors on the Issue Date or (2) was nominated for election or elected to the Board of Directors with the approval of a majority of the Continuing Directors who were members of the Board at the time of the nomination or election.

“ Credit Agreement ” means that Credit Agreement, dated as of June 12, 2007 (as amended on or prior to the Issue Date), by and among Great Lakes, LaSalle Bank National Association, as swing line lender, sole lead arranger and administrative agent, and the other lenders that are party to the Credit Agreement, including any related notes, guarantees, collateral documents, instruments and agreements executed in connection therewith, and in each case as increased as permitted by the terms of the indenture, and amended, modified, renewed, restated, refunded, replaced or refinanced from time to time, including any agreement extending the maturity of, refinancing, replacing or otherwise restructuring (including adding Subsidiaries of Great Lakes as additional borrowers or guarantors thereunder) all or any portion of the Indebtedness under such agreement or any successor or replacement agreement and whether by the same or any other agent, lender or group of lenders or through the issuance of debt securities.

“ Credit Facilities ” means, with respect to Great Lakes or its Restricted Subsidiaries, one or more debt facilities (including, without limitation, the Credit Agreement) or commercial paper facilities or indentures with banks or other institutional lenders or a trustee providing for revolving credit loans, term loans, receivables financing (including through the sale of receivables to such lenders or to special purpose entities formed to borrow from such lenders against such receivables) or letters of credit or issuance of debt securities to

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institutional investors, in each case, as increased as permitted by the terms of the indenture, and amended, restated, modified, renewed, refunded, replaced, restated, substituted or refinanced in whole or in part from time to time.

“ Default ” means any event that is or with the passage of time or the giving of notice or both would be an Event of Default.

“ Designated Non-cash Consideration ” means any non-cash consideration received by Great Lakes or one of its Restricted Subsidiaries in connection with an Asset Sale that is designated as Designated Non-cash Consideration pursuant to an Officers’ Certificate executed by the Chief Financial Officer of Great Lakes. Such Officers’ Certificate shall state the basis of such valuation. A particular item of Designated Non-cash Consideration shall no longer be considered to be outstanding to the extent it has been sold or liquidated for cash (but only to the extent of the cash received).

“ Designated Vessels ” means the dredge “New York,” the dredge “Liberty Island,” the bottom-dump barges G.L.65, G.L.501 and G.L.502, the self-unloading barge “Long Island,” the trailing suction hopper dredge “Terrapin Island” and the barge “U.S. Flag Idler,” G.L.177, and ancillary equipment related thereto.

“ Disqualified Stock ” means any Capital Stock that, by its terms (or by the terms of any security into which it is convertible, or for which it is exchangeable, at the option of the holder), or upon the happening of any event (other than optional redemption by Great Lakes thereof), matures or is mandatorily redeemable, pursuant to a sinking fund obligation or otherwise, or redeemable at the option of the holder, in whole or in part, on or prior to the date that is 91 days after the date on which the notes mature; provided, however, that any Capital Stock that would constitute Disqualified Stock solely because the holders have the right to require Great Lakes to repurchase the Capital Stock upon the occurrence of a Change of Control or an Asset Sale shall not constitute Disqualified Stock if the terms of the Capital Stock provide that Great Lakes may not repurchase or redeem any such Capital Stock pursuant to such provisions unless the repurchase or redemption complies with the covenant described above under the caption “—Certain Covenants—Limitation on Restricted Payments.”

“ Domestic Subsidiary ” means any Restricted Subsidiary of Great Lakes that was formed under the laws of the United States or any state of the United States or the District of Columbia.

“ Equity Interests ” means Capital Stock and all warrants, options or other rights to acquire Capital Stock (but excluding any debt security that is convertible into, or exchangeable for, Capital Stock).

“ Equity Offering ” means a public or private offering or sale of Equity Interests (other than Disqualified Stock) of Great Lakes or a direct or indirect parent of Great Lakes (so long as the net proceeds thereof are contributed to the common equity capital of Great Lakes).

“ Exchange Act ” means the Securities Exchange Act of 1934, as amended, or any successor statute or statutes thereto.

“ Exchange Notes ” means new notes of Great Lakes issued in exchange for the notes pursuant to the Registration Rights Agreement; provided that such new notes have terms substantially identical in all material respects to the notes (except that Exchange Notes will not contain terms with respect to transfer restrictions) for which such offer is being made.

“ Excluded Contribution ” means the net cash proceeds received by Great Lakes after the Issue Date from (a) contributions to its common equity capital and (b) the sale (other than to a Subsidiary or pursuant to any management equity plan or stock option plan or any other management or employee benefit plan or agreement of Great Lakes or any of its Subsidiaries) of Capital Stock (other than Disqualified Stock) of Great Lakes, in each case designated within 60 days of the receipt of such net cash proceeds as Excluded Contributions pursuant to an

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Officers’ Certificate, the cash proceeds of which are excluded from the calculation set forth in the clause (3)(B) of the first paragraph of the covenant described above under the “—Certain Covenants—Limitation on Restricted Payments.”

“ Excluded Subsidiaries ” means each Foreign Subsidiary and each Domestic Subsidiary that is not a Wholly Owned Restricted Subsidiary.

“ Existing Indebtedness ” means Indebtedness (including guarantees) of Great Lakes and its Restricted Subsidiaries (other than Indebtedness incurred pursuant to clause (1) of the second paragraph of the covenant described above under the caption “Certain Covenants—Limitation on Incurrence of Indebtedness and Issuance of Disqualified Stock) in existence on the Issue Date, until permanently repaid.

“ Fair Market Value ” means, with respect to any asset, the price (after taking into account any liabilities relating to such assets) that would be negotiated in an arm’s-length transaction between a willing seller and a willing and able buyer, neither of whom is under undue pressure or compulsion to complete the transaction; provided that, other than as expressly set forth in the indenture, for purposes of determining the “Fair Market Value” of any property or assets, such Fair Market Value shall be determined by (x) Great Lakes in good faith with respect to assets or property with a Fair Market value not in excess of $5.0 million, (y) Great Lakes’ Chief Financial Officer with respect to assets or property with a Fair Market Value in excess of $5.0 million but not in excess of $10.0 million and (z) Great Lakes’ Board of Directors with respect to assets or property with a Fair Market Value in excess of $10.0 million.

“ Fixed Charges ” means, with respect to any Person for any period, the sum, without duplication, of

(1) the consolidated interest expense of such Person and its Restricted Subsidiaries for such period, whether paid or accrued (including, without limitation, amortization of debt issuance costs and original issue discount, non-cash interest payments, the interest component of any deferred payment obligations, the interest component of all payments associated with Capital Lease Obligations, commissions, discounts and other fees and charges incurred in respect of letter of credit or bankers’ acceptance financings, and net payments (if any) pursuant to interest rate Hedging Obligations (but excluding the amortization or write-off of financing fees in connection with the transactions contemplated in connection with the initial offering of the notes), net of interest income of such Person and its Restricted Subsidiaries for such period; and

(2) the consolidated interest of such Person and its Restricted Subsidiaries that was capitalized during such period; and

(3) any interest expense on Indebtedness of another Person that is guaranteed by such Person or one of its Restricted Subsidiaries or secured by a Lien on assets of such Person or one of its Restricted Subsidiaries (whether or not the guarantee or Lien is called upon); and

(4) the product of (a) all cash dividend payments and non-cash dividend payments on any series of preferred stock and any series of Disqualified Stock, in each case, of such Person or any of its Restricted Subsidiaries, other than dividend payments (x) on Equity Interests payable solely in Equity Interests of Great Lakes (other than Disqualified Stock) or (y) to Great Lakes or a Guarantor, times (b) a fraction, the numerator of which is one and the denominator of which is one minus the then current combined federal, state and local statutory tax rate of such Person, expressed as a decimal, in each case, on a consolidated basis and in accordance with GAAP.

“ Fixed Charge Coverage Ratio ” means with respect to any Person for any period, the ratio of the Consolidated Cash Flow to the Fixed Charges of such Person for such period. In the event that the referent Person or any of its Restricted Subsidiaries incurs, assumes, guarantees, repays or redeems any Indebtedness (other than repayment of revolving credit borrowings that are not accompanied by a permanent reduction in the commitment amount) or issues or redeems preferred stock subsequent to the commencement of the period for which the Fixed Charge Coverage Ratio is being calculated but prior to the date on which the event for which the

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calculation of the Fixed Charge Coverage Ratio is made (the “Calculation Date”), then the Fixed Charge Coverage Ratio shall be calculated giving pro forma effect to such incurrence, assumption, guarantee or redemption of Indebtedness, or such issuance or redemption of preferred stock, as if the same had occurred at the beginning of the applicable four-quarter reference period. In addition, for purposes of making the computation referred to above,

(1) acquisitions and dispositions that have been made by Great Lakes or any of its Restricted Subsidiaries, including through mergers or consolidations and including any related financing transactions, during the four-quarter reference period or subsequent to such reference period and on or prior to the Calculation Date shall be given pro forma effect as if they occurred on the first day of the four-quarter reference period in accordance with Regulation S-X under the Securities Act and, in connection with any acquisition, shall be calculated giving pro forma effect to Pro Forma Cost Savings;

(2) the Consolidated Cash Flow attributable to discontinued operations, as determined in accordance with GAAP, and operations or businesses disposed of prior to the Calculation Date, shall be excluded in accordance with clause (1) above;

(3) the Fixed Charges attributable to discontinued operations, as determined in accordance with GAAP, and operations or businesses disposed of prior to the Calculation Date, shall be excluded in accordance with clause (1) or (2) above, as applicable, but only to the extent that the obligations giving rise to such Fixed Charges will not be obligations of the referent Person or any of its Restricted Subsidiaries following the Calculation Date;

(4) Consolidated Cash Flow shall be calculated giving pro forma effect to the creation, designation or redesignation of Restricted and Unrestricted Subsidiaries, as if such creation, designation or redesignation occurred on the first day of the four-quarter reference period; and

(5) if any Indebtedness being incurred bears a floating rate of interest, the interest expense on such Indebtedness will be calculated as if the rate in effect on the Calculation Date had been the applicable rate for the entire period (taking into account any Hedging Obligation applicable to such Indebtedness if such Hedging Obligation has a remaining term as at the Calculation Date in excess of 12 months).

“ Foreign Subsidiary ” means a Restricted Subsidiary that is not a Domestic Subsidiary.

“ GAAP “ means generally accepted accounting principles set forth in the opinions and pronouncements of the Accounting Principles Board of the American Institute of Certified Public Accountants and statements and pronouncements of the Financial Accounting Standards Board or in such other statements by such other entity as have been approved by a significant segment of the accounting profession, which are in effect on the Issue Date.

“ Government Securities ” means securities that are:

(1) direct obligations of the United States of America for the timely payment of which its full faith and credit is pledged, or

(2) obligations of a Person controlled or supervised by and acting as an agency or instrumentality of the United States of America the timely payment of which is unconditionally guaranteed as a full faith and credit Obligation by the United States of America, which, in each case, are not callable or redeemable at the option of the issuer thereof, and shall also include a depository receipt issued by a bank (as defined in Section 3(a)(2) of the Securities Act) as custodian with respect to any such U.S. government obligations or a specific payment of principal of or interest on any such U.S. government obligations held by such custodian for the account of the holder of such depository receipt; provided, however, that (except as required by law) such custodian is not authorized to make any deduction from the amount payable to the holder of such depository receipt from any amount received by the custodian in respect of the U.S. government obligations or the specific payment of principal of or interest on the U.S. government obligations evidenced by such depository receipt.

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“ guarantee ” means a guarantee (other than by endorsement of negotiable instruments for collection in the ordinary course of business), direct or indirect, in any manner (including, without limitation, by way of a pledge of assets or through letters of credit or reimbursement agreements), of all or any part of any Indebtedness.

“ Guarantee ” means a full and unconditional senior unsecured guarantee of the notes pursuant to the indenture.

“ Guarantor ” means any Restricted Subsidiary of Great Lakes that issues a Guarantee of the notes, in each case, until such Person is released from its Guarantee in accordance with the indenture.

“ Hedging Obligations ” means, with respect to any Person, the obligations of such Person under

“ Indebtedness ” means, with respect to any Person, any indebtedness of such Person, whether or not contingent, in respect of:

(1) borrowed money;

(2) evidenced by bonds, notes, debentures or similar instruments or letters of credit (or related reimbursement agreements);

(3) banker’s acceptances;

(4) representing Capital Lease Obligations;

(5) the balance deferred and unpaid of the purchase price of any property except any such balance that constitutes an accrued expense or trade payable; or

(6) representing the net amount owning under any Hedging Obligations relating to interest rate risk,

if and to the extent any of the foregoing (other than letters of credit and Hedging Obligations) would appear as a liability upon a balance sheet of such Person prepared in accordance with GAAP, as well as all Indebtedness of others secured by a Lien on any asset of such Person (whether or not such Indebtedness is assumed by such Person) and, to the extent not otherwise included, the guarantee by such Person of any Indebtedness of any other Person.

“ Investments ” means, with respect to any Person, all investments by such Person in other Persons (including Affiliates) in the forms of direct or indirect loans (including guarantees of Indebtedness or other obligations), advances or capital contributions (excluding commission, travel and similar advances to officers and employees made in the ordinary course of business), purchases or other acquisitions of Indebtedness, Equity Interests or other securities, together with all items that are or would be classified as investments on a balance sheet prepared in accordance with GAAP; provided that an acquisition of Equity Interests or other securities by Great Lakes or any of its Restricted Subsidiaries for consideration consisting solely of Equity Interests (other than Disqualified Stock) of Great Lakes shall not be deemed to be an Investment. If Great Lakes or any Restricted Subsidiary of Great Lakes sells or otherwise disposes of any Equity Interests of any direct or indirect Restricted Subsidiary of Great Lakes such that, after giving effect to the sale or disposition, such Person is no longer a Restricted Subsidiary of Great Lakes, Great Lakes shall be deemed to have made an Investment on the date of any such sale or disposition equal to the Fair Market Value of the Equity Interests of the Restricted Subsidiary not sold or disposed of in an amount determined as provided in the final paragraph of the covenant described above under the caption “—Limitation on Restricted Payments.”

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“ Issue Date ” means January 28, 2011.

“ Lien ” means, with respect to any asset, any mortgage, lien, pledge, charge, security interest or encumbrance of any kind, whether or not filed, recorded or otherwise perfected under applicable law (including any conditional sale or other title retention agreement, any lease in the nature of a conditional sale or title retention agreement, any option or other agreement to sell or give a security interest in and any filing of or agreement to give any financing statement under the Uniform Commercial Code (or equivalent statutes) of any jurisdiction).

“ Net Income ” means, with respect to any Person for any period, the net income (loss) of such Person, determined in accordance with GAAP and before any reduction in respect of dividends on preferred interests, excluding, however,

“ Net Proceeds ” means the aggregate cash proceeds received by Great Lakes or any of its Restricted Subsidiaries in respect of any Asset Sale (including, without limitation, any cash received upon the sale or other disposition of any non-cash consideration received in any Asset Sale (including Designated Non-cash Consideration)), net of

(1) the direct costs relating to such Asset Sale (including, without limitation, legal, accounting and investment banking fees, and sales commissions) and any related relocation expenses;

(2) any taxes paid or payable as a result of the asset sale (after taking into account any available tax credits or deductions, any tax sharing arrangements);

(3) any reserve for adjustment in respect of the sale price of the asset or assets established in accordance with GAAP;

(4) payments made to repay Indebtedness or any other obligation outstanding at the time of such Asset Sale that is secured by a Lien on the property or assets sold;

(5) all distributions and other payments required to be made to minority interest holders in Subsidiaries or joint ventures as a result of such Asset Sale; and

(6) appropriate amounts to be provided by Great Lakes or any Restricted Subsidiary as a reserve against any liabilities associated with such Asset Sale, including, without limitation, pension and other post-employment benefit liabilities, liabilities related to environmental matters and liabilities under any indemnification obligations associated with Asset Sale, all as determined in conformity with GAAP.

“ Non-Recourse Debt ” means Indebtedness

(1) as to which neither Great Lakes nor any of its Restricted Subsidiaries

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(2) no default with respect to which (including any rights that any holders may have to take enforcement action against an Unrestricted Subsidiary) would permit (upon notice, lapse of time or both) any holder of any other Indebtedness (other than the notes being offered hereby) of Great Lakes or any of its Restricted Subsidiaries to declare a default on such other Indebtedness or cause its payment to be accelerated or payable prior to its stated maturity; and

(3) as to which the lenders have been notified in writing that they will not have any recourse to the stock or assets of Great Lakes or any of its Restricted Subsidiaries.

“ Obligations ” means any principal, interest, penalties, fees, indemnifications, costs, expenses, reimbursement obligations, damages and other liabilities and obligations which may arise under or in connection with the Credit Agreement or the Bonding Agreement or under or in connection with the documentation governing any Indebtedness, and in all cases whether direct or indirect, absolute or contingent, now outstanding or hereafter created, assumed or incurred and including, without limitation, interest accruing subsequent to the filing of a petition in bankruptcy or the commencement of any insolvency, reorganization or similar proceedings at the rate provided in the relevant document, whether or not an allowed claim, and any obligation to redeem or defease any of the foregoing.

“ Permitted Bonding Obligations ” means (1) obligations incurred by Great Lakes or any of its Restricted Subsidiaries (including guarantees) with respect to letters of credit, banker acceptances, bid, payment, performance, surety, appeal or similar bonds and completion guarantees in the ordinary course of business and (2) obligations incurred by Great Lakes or any of its Restricted Subsidiaries (including guarantees) under the Bonding Agreement.

“ Permitted Business ” means any of the businesses engaged in by Great Lakes and its Restricted Subsidiaries on the Issue Date, together with other marine specialty contractor services, marine infrastructure construction, demolition and environmental services, dredging, repair, salvage and maintenance services, marine transportation, aggregates production, storage, handling, sales and supply and any other reasonably related, complementary or ancillary business or other business that is a reasonable extension or expansion of such business.

“ Permitted Investments ” means

(1) any Investment in Great Lakes or in a Restricted Subsidiary of Great Lakes;

(2) any Investment in Cash Equivalents;

(3) any Investment by Great Lakes or any Restricted Subsidiary of Great Lakes in a Person, if as a result of such Investment (i) such Person becomes a Restricted Subsidiary of Great Lakes or (ii) such Person is merged, consolidated or amalgamated with or into, or transfers or conveys substantially all of its assets to, or is liquidated into, Great Lakes or a Restricted Subsidiary of Great Lakes;

(4) any Investment made as a result of the receipt of assets not constituting Cash Equivalents from an Asset Sale that was made pursuant to and in compliance with the covenant described above under the caption “—Repurchase at the Option of Holders—Asset Sales”;

(5) any acquisition of assets solely in exchange for the issuance of Equity Interests (other than Disqualified Stock) of Great Lakes;

(6) other Investments in any Person having an aggregate Fair Market Value (measured on the date each such Investment was made and without giving effect to subsequent changes in value), when taken together with all other Investments made pursuant to this clause (6) that are at the time outstanding, not to exceed the greater of $35.0 million and 7.5% of Total Tangible Assets, provided, however, that if an Investment pursuant to this clause (6) is made in any Person that is not a Restricted Subsidiary of Great Lakes at the date of the making of the Investment and such person becomes a Restricted Subsidiary after such date, such Investment shall thereafter be deemed to have been made pursuant to clause (1) above, and shall cease to have been made pursuant to this clause (6);

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(7) Investments received in settlement, compromise or resolution of: (a) obligations of trade creditors, suppliers or customers that were incurred in the ordinary course of business of Great Lakes or any of its Subsidiaries including pursuant to a plan of reorganization or similar arrangement upon the bankruptcy or insolvency of such trade creditors, suppliers or customers or (b) litigation, arbitration or other disputes with Persons;

(8) Investments existing on the Issue Date;

(9) loans and advances to officers, directors, members and employees for business-related travel expenses, moving expenses and other similar expenses, in each case, incurred in the ordinary course of business not to exceed $2.0 million in the aggregate at any time;

(10) any Hedging Obligation;

(11) Investments consisting of intercompany loans from Great Lakes and its Restricted Subsidiaries to Restricted Subsidiaries, including Restricted Subsidiaries that are not Guarantors;

(12) Investments in any Person engaging in a Permitted Business in an aggregate amount at any one time outstanding not to exceed $25.0 million;

(13) guarantees otherwise permitted by the terms of the indenture; and

(14) Investments resulting from the acquisition of a Person that at the time of such acquisition held instruments constituting Investments that were not acquired in contemplation of the acquisition of such Person.

“ Permitted Liens ” means

(1) Liens securing Indebtedness under Credit Facilities incurred pursuant to clause (1) of the second paragraph of the covenant described under the caption “Limitation on Incurrence of Indebtedness and Issuance of Disqualified Stock”;

(2) Liens in favor of Great Lakes or a Restricted Subsidiary;

(3) Liens on property or assets of, or any equity interest in or secured debt of, a Person existing at the time that Person is merged with or into or consolidated with Great Lakes or any Restricted Subsidiary of Great Lakes; provided that such Liens were in existence prior to the contemplation of such merger or consolidation and do not extend to any assets other than those of the Person merged into or consolidated with Great Lakes;

(4) Liens on property (including Capital Stock) existing at the time the property was acquired by Great Lakes or any Restricted Subsidiary of Great Lakes, provided that such Liens were in existence prior to the contemplation of the acquisition of property;

(5) Liens to secure the performance of statutory obligations, surety or appeal bonds, bid bonds, payment bonds, performance and lien bonds or other obligations of a like nature incurred in the ordinary course of business, including any Permitted Bonding Obligations;

(6) Liens to secure Indebtedness (including Capital Lease Obligations) permitted by clause (4) or (8) of the second paragraph of the covenant under the caption “Incurrence of Indebtedness and Issuance of Disqualified Stock” covering, in the case of such clause (4), only the assets (including any insurance, leases and charters relating to such assets, and any proceeds thereof) acquired, constructed, repaired or improved with such Indebtedness;

(7) Liens existing on the Issue Date and any renewals or extensions thereof on terms no more restrictive and secured by the same collateral as existing on the date of the indenture (other than Liens securing Indebtedness under Credit Facilities incurred pursuant to clause (1) of the second paragraph of the covenant described under the caption “Limitation on Incurrence of Indebtedness and Issuance of Disqualified Stock”);

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(8) Liens for taxes, assessments or governmental charges or claims that are not yet delinquent or that are being contested in good faith by appropriate proceedings promptly instituted and diligently concluded, provided that any reserve or other appropriate provision as shall be required in conformity with GAAP shall have been made therefor;

(9) Liens to secure Indebtedness of any Foreign Subsidiary permitted to be incurred under the covenant entitled “—Certain Covenants—Limitation on Incurrence of Indebtedness and Issuance of Disqualified Stock” covering only the assets of such Foreign Subsidiary;

(10) Liens incurred in the ordinary course of business of Great Lakes or any Restricted Subsidiary of Great Lakes with respect to obligations that do not exceed $20.0 million at any one time outstanding and that (A) are not incurred in connection with the borrowing of money or the obtaining of advances or credit (other than trade credit in the ordinary course of business) and (B) do not in the aggregate materially detract from the value of the property or materially impair the use of the property in the operation of business by Great Lakes or the Restricted Subsidiary;

(11) statutory Liens of landlords and Liens of carriers, warehousemen, mechanics, suppliers, materialmen, repairmen and other Liens (including maritime Liens) imposed by law incurred in the ordinary course of business;

(12) Liens incurred or deposits made in the ordinary course of business in connection with workers’ compensation, unemployment insurance and other types of social security or similar obligations, or to secure the performance of tenders, statutory or regulatory obligations, surety and appeal bonds, bids, leases, government contracts, payment and performance and return-of-money bonds, bankers’ acceptances, and other similar obligations (exclusive of obligations for the payment of borrowed money);

(13) judgment or attachment Liens not giving rise to an Event of Default;

(14) easements, rights-of-way, municipal and zoning restrictions and other similar charges, title defects, encumbrances or irregularities in respect of real property not interfering in any material respect with the ordinary course of the business of Great Lakes or any of its Restricted Subsidiaries;

(15) any interest or title of a lessor under any lease, whether or not characterized as capital or operating; provided that such Liens do not extend to any property or assets which is not leased property subject to such lease;

(16) Liens securing Hedging Obligations;

(17) Liens securing reimbursement obligations with respect to letters of credit and products and proceeds thereof;

(18) Liens securing Permitted Refinancing Indebtedness which is incurred to refinance any Indebtedness which has been secured by a Lien permitted under the indenture and which has been incurred in accordance with the provisions of the indenture;

(19) Liens in favor of Great Lakes or any of its Restricted Subsidiaries securing Indebtedness of any Restricted Subsidiary that is not a Guarantor;

(20) Liens with respect to current wages of the master and crew and for wages of a stevedore when employed directly by Great Lakes or any Subsidiary of Great Lakes, or by the charterer, operator, master or agent of any of the vessels owned or operated by Great Lakes or any Subsidiary of Great Lakes;

(21) Liens for salvage (including contract salvage);

(22) Liens arising by operation of law or by contract in each case encumbering insurance policies and proceeds thereof to secure the financing of premiums of such insurance policies;

(23) Liens arising pursuant to a purchase agreement or sale agreement securing the obligations under such purchase agreement or sale agreement and encumbering solely the assets that are to be sold in any asset sale permitted under “—Asset Sales”; and

(24) Liens with respect to bareboat charters, leases and licenses of assets in the ordinary course of business.

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“ Permitted Refinancing Indebtedness ” means any Indebtedness of Great Lakes or any of its Restricted Subsidiaries issued in exchange for, to extend, refinance, renew, replace, defease or refund other Indebtedness of Great Lakes or any of its Restricted Subsidiaries (other than intercompany Indebtedness); provided that:

(1) the principal amount (or accreted value, if applicable) of the Permitted Refinancing Indebtedness does not exceed the principal amount of (or accreted value, if applicable), plus accrued interest on, the Indebtedness so extended, refinanced, renewed, replaced, defeased or refunded (plus the amount of reasonable expenses, premiums, penalties, fees and interest incurred in connection therewith);

(2) if the final maturity date of the Indebtedness being refinanced is earlier than the final maturity of the notes, the Permitted Refinancing Indebtedness has a final maturity date later than the final maturity date of, and has a Weighted Average Life to Maturity equal to or greater than the Weighted Average Life to Maturity of, the Indebtedness being extended, refinanced, renewed, replaced, defeased or refunded or (b) if the final maturity of the Indebtedness being refinanced is later than the final maturity of the notes, the Permitted Refinancing Indebtedness has a final maturity at least 91 days later than the notes;

(3) if the Indebtedness being extended, refinanced, renewed, replaced, defeased or refunded is subordinated in right of payment to the notes, the Permitted Refinancing Indebtedness has a final maturity date later than the final maturity date of, and is subordinated in right of payment to, the notes on terms at least as favorable to the holders of notes as those contained in the documentation governing the Indebtedness being extended, refinanced, renewed, replaced, defeased or refunded; and

(4) such Indebtedness is incurred either (a) by Great Lakes or any Guarantor or (b) by the Restricted Subsidiary who is the obligor on the Indebtedness being extended, refinanced, renewed, replaced, defeased or refunded.

“ Permitted Tax Distributions ” means the payment of any distributions to permit direct or indirect beneficial owners of shares of Capital Stock of Great Lakes to pay federal, state or local income tax liabilities arising from income to Great Lakes and attributable to them solely as a result of Great Lakes’ and any intermediate entity through which the holder owns such shares being a limited liability company, partnership or similar entity for federal income tax purposes.

“ Person ” means an individual, partnership, corporation, unincorporated organization, trust or joint venture, or a governmental agency or political subdivision thereof.

“ Pro Forma Cost Savings ” means, with respect to any period, the reduction in costs that were (1) directly attributable to an asset acquisition and calculated on a basis that is consistent with Regulation S-X under the Securities Act in effect and as applied as of the Issue Date, or (2) were actually implemented by the business that was the subject of any such asset acquisition within six months of the date of the asset acquisition and that are supportable and quantifiable by the underlying accounting records of such business, in case as if such reductions in cost had been effected as of the beginning of the applicable period and, in the case of each of (1) and (2), are described, as provided below, in an officer’s certificate, as if all such reductions in costs had been effected as of the beginning of such period. Pro Forma Cost Savings described above shall be accompanied by a certificate delivered to the trustee from Great Lakes’ Chief Financial Officer that outlines the specific actions taken or to be taken, the net cost savings achieved or to be achieved from each such action.

“ Qualified Proceeds ” means any of the following or any combination of the following:

(1) cash,

(2) Cash Equivalents,

(3) assets that are used or useful in a Permitted Business and

(4) the Capital Stock of any Person engaged in a Permitted Business if, in connection with the receipt by Great Lakes or any Restricted Subsidiary of Great Lakes of such Capital Stock, (a) such Person becomes

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a Restricted Subsidiary of Great Lakes or any Restricted Subsidiary of Great Lakes or (b) such Person is merged, consolidated or amalgamated with or into, or transfers or conveys substantially all of its assets to, or is liquidated into, Great Lakes or any Restricted Subsidiary of Great Lakes.

“ Registration Rights Agreement ” means the Registration Rights Agreement dated as of the Issue Date among Great Lakes, the Guarantors and Deutsche Bank Securities Inc., Merrill Lynch, Pierce, Fenner & Smith Incorporated and Lazard Capital Markets LLC, as initial purchasers.

“ Restricted Investment ” means an Investment other than a Permitted Investment.

“ Restricted Payments ” means

(1) declare or pay any dividend or make any other payment or distribution on account of Great Lakes’ or any of its Restricted Subsidiaries’ Equity Interests (including, without limitation, any payment in connection with any merger or consolidation involving Great Lakes or any of its Restricted Subsidiaries) or to the direct or indirect holders of Great Lakes’ or any of its Restricted Subsidiaries’ Equity Interests in their capacity as such (other than, in each case, dividends or distributions payable in Equity Interests (other than Disqualified Stock) of Great Lakes or dividends or distributions payable to Great Lakes or a Restricted Subsidiary of Great Lakes);

(2) purchase, redeem or otherwise acquire or retire for value (including, without limitation, in connection with any merger or consolidation involving Great Lakes) any Equity Interests of Great Lakes (other than Equity Interests owned by Great Lakes or any Restricted Subsidiary of Great Lakes) or any direct or indirect parent of Great Lakes;

(3) make any payment on or with respect to, or purchase, redeem, defease or otherwise acquire or retire for value any Indebtedness of Great Lakes that is contractually subordinated to the notes or to the Guarantees (other than any subordinated Indebtedness held by Great Lakes or any Restricted Subsidiary), except a payment of interest or principal at Stated Maturity; or

(4) make any Restricted Investment.

“ Restricted Subsidiary ” of a Person means any Subsidiary of the referent Person that is not an Unrestricted Subsidiary.

“ Secured Indebtedness ” means any Indebtedness secured by a Lien.

“ Securities Act ” means the Securities Act of 1933, as amended.

“ Significant Subsidiary ” means any Subsidiary that would be a “significant subsidiary” as defined in Article 1, Rule 1-02 of Regulation S-X, promulgated pursuant to the Act, as in effect on the Issue Date.

“ Stated Maturity ” means, with respect to any installment of interest or principal (including any sinking fund payment) on any series of Indebtedness, the date on which payment of interest or principal was scheduled to be paid in the original documentation governing such Indebtedness, and shall not include any contingent obligations to repay, redeem or repurchase any such interest or principal prior to the date originally scheduled for their payment.

“ Subsidiary ” means, with respect to any Person, (1) any corporation, association or other business entity of which more than 50% of the total voting power of shares of Capital Stock entitled (without regard to the occurrence of any contingency) to vote in the election of directors, managers or trustees thereof is at the time owned or controlled, directly or indirectly, by such Person or one or more of the other Subsidiaries of that Person (or a combination thereof) and (2) any partnership (A) the sole general partner or the managing general partner of which is such Person or a Subsidiary of such Person or (B) the only general partners of which are such Person or one or more Subsidiaries of such Person (or any combination thereof).

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“ Total Tangible Assets ” means, with respect to any Person, the aggregate of all assets of such Person and its Restricted Subsidiaries as would be shown on the consolidated balance sheet of such Person in accordance with GAAP, less goodwill and intangibles.

“ Treasury Rate ” means, as of any Redemption Date, the yield to maturity as of such Redemption Date of United States Treasury securities with a constant maturity (as compiled and published in the most recent Federal Reserve Statistical Release H.15 (519) that has become publicly available at least two business days prior to the Redemption Date (or, if such Statistical Release is no longer published, any publicly available source of similar market data)) most nearly equal to the period from the Redemption Date to February 1, 2015; provided , however , that if the period from the Redemption Date to February 1, 2015 is less than one year, the weekly average yield on actually traded United States Treasury securities adjusted to a constant maturity of one year will be used.

“ Unrestricted Subsidiary ” means any Subsidiary of Great Lakes or any successor to any of them) that is designated by the Board of Directors of Great Lakes as an Unrestricted Subsidiary pursuant to a board resolution; but only to the extent that such Subsidiary:

(1) has no Indebtedness other than Non-Recourse Debt;

(2) is not party to any agreement, contract, arrangement or understanding with Great Lakes or any Restricted Subsidiary of Great Lakes unless the terms of any such agreement, contract, arrangement or understanding are no less favorable to Great Lakes or such Restricted Subsidiary than those that might be obtained at the time from Persons who are not Affiliates of Great Lakes;

(3) is a Person with respect to which neither Great Lakes nor any of its Restricted Subsidiaries has any direct or indirect obligation (A) to subscribe for additional Equity Interests or (B) to maintain or preserve such Person’s financial condition or to cause such Person to achieve any specified levels of operating results;

(4) has not guaranteed or otherwise directly or indirectly provided credit support for any Indebtedness of Great Lakes or any of its Restricted Subsidiaries; and

(5) has at least one director on its board of directors that is not a director or executive officer of Great Lakes or any of its Restricted Subsidiaries and has at least one executive officer that is not a director or executive officer of Great Lakes or any of its Restricted Subsidiaries.

Any designation by the Board of Directors of an Unrestricted Subsidiary shall be evidenced to the trustee by filing with the trustee a certified copy of the Board Resolution giving effect to the designation and an Officers’ Certificate certifying that the designation complied with the foregoing conditions and was permitted by the covenant described above under the caption “Certain Covenants—Limitation on Restricted Payments.” If, at any time, any Unrestricted Subsidiary would fail to meet the foregoing requirements as an Unrestricted Subsidiary, it shall thereafter cease to be an Unrestricted Subsidiary for purposes of the indenture and any Indebtedness of such Subsidiary shall be deemed to be incurred by a Restricted Subsidiary of Great Lakes as of such date (and, if such Indebtedness is not permitted to be incurred under the covenant described under the caption “Certain Covenants—Limitation on Incurrence of Indebtedness and Issuance of Disqualified Stock,” Great Lakes shall be in default of the covenant). The Board of Directors of Great Lakes may at any time designate any Unrestricted Subsidiary to be a Restricted Subsidiary; provided that such designation shall be deemed to be an incurrence of Indebtedness by a Restricted Subsidiary of Great Lakes of any outstanding Indebtedness of such Unrestricted Subsidiary and the designation shall only be permitted if (1) such Indebtedness is permitted under the covenant described under the caption “Certain Covenants—Limitation on Incurrence of Indebtedness and Issuance of Disqualified Stock,” calculated on a pro forma basis as if the designation had occurred at the beginning of the four-quarter reference period, and (2) no Default or Event of Default would be in existence following the designation.

“ Voting Stock ” of any Person as of any date means the Capital Stock of such Person that is at the time entitled to vote in the election of the Board of Directors of such Person.

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“ Weighted Average Life to Maturity ” means, when applied to any Indebtedness at any date, the number of years obtained by dividing (1) the sum of the products obtained by multiplying (A) the amount of each then remaining installment, sinking fund, serial maturity or other required payments of principal, including payment at final maturity, by (B) the number of years (calculated to the nearest one-twelfth) that will elapse between such date and the making of such payment, by (2) the then outstanding principal amount of such Indebtedness.

“ Wholly Owned Restricted Subsidiary ” of any Person means a Restricted Subsidiary of such Person all of the outstanding Capital Stock or other ownership interests of which (other than directors’ qualifying shares) shall at the time be owned by such Person or by one or more Wholly Owned Restricted Subsidiaries of such Person and one or more Wholly Owned Restricted Subsidiaries of such Person.

“ 2003 Merger Agreement ” means the Agreement and Plan of Merger among GLDD Acquisitions Corp., GLDD Merger Sub, Inc. and Great Lakes, dated as of November 12, 2003, in connection with the sale of all of the outstanding common stock of Great Lakes to GLDD Acquisitions Corp. and the merger of GLDD Merger Sub, Inc. with and into Great Lakes.

“ 2003 Transactions ” means, the transactions contemplated by the 2003 Merger Agreement and the related financing transactions.

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BOOK-ENTRY; DELIVERY AND FORM

The certificates representing the exchange notes will be issued in fully registered form without interest coupons.

The exchange notes initially will be represented by notes in registered, global form without interest coupons (collectively, the “Global Notes”). The Global Notes will be deposited upon issuance with the trustee as custodian for DTC, in New York, New York, and registered in the name of DTC or its nominee for credit to an account of a direct or indirect participant in DTC as described below. Global Notes may be transferred, in whole and not in part, only to another nominee of DTC or to a successor of DTC or its nominee. Beneficial interests in the Global Notes may be held through Euroclear and Clearstream (as indirect participants in DTC).

The Global Notes

We expect that pursuant to procedures established by DTC (i) upon the issuance of the Global Notes, DTC or its custodian will credit, on its internal system, the principal amount at maturity of the individual beneficial interests represented by such Global Notes to the respective accounts of persons who have accounts with such depositary and (ii) ownership of beneficial interests in the Global Notes will be shown on, and the transfer of such ownership will be effected only through, records maintained by DTC or its nominee (with respect to interests of participants) and the records of participants (with respect to interests of persons other than participants). Holders may hold their interests in the Global Notes directly through DTC if they are persons who have accounts with DTC (“participants”) in such system, or indirectly through organizations which are participants in such system.

So long as DTC, or its nominee, is the registered owner or holder of the notes, DTC or such nominee, as the case may be, will be considered the sole owner or holder of the notes represented by such Global Notes for all purposes under the indenture. No beneficial owner of an interest in the Global Notes will be able to transfer that interest except in accordance with DTC’s procedures, in addition to those provided for under the indenture with respect to the notes.

Payments of the principal of, premium (if any) and interest (including additional interest, if any) on the Global Notes will be made to DTC or its nominee, as the case may be, as the registered owner thereof. None of us, the trustee or any paying agent will have any responsibility or liability for any aspect of the records relating to or payments made on account of beneficial ownership interests in the Global Notes or for maintaining, supervising or reviewing any records relating to such beneficial ownership interest.

We expect that DTC or its nominee, upon receipt of any payment of principal, premium, if any, and interest (including additional interest, if any) on the Global Notes, will credit participants’ accounts with payments in amounts proportionate to their respective beneficial interests in the principal amount of the Global Notes as shown on the records of DTC or its nominee. We also expect that payments by participants to owners of beneficial interests in the Global Notes held through such participants will be governed by standing instructions and customary practice, as is now the case with securities held for the accounts of customers registered in the names of nominees for such customers. Such payments will be the responsibility of such participants.

Transfers between participants in DTC will be effected in the ordinary way through DTC’s same-day funds system in accordance with DTC rules and will be settled in same day funds. If a holder requires physical delivery of a Certificated Security for any reason, including to sell notes to persons in states which require physical delivery of the notes, or to pledge such securities, such holder must transfer its interest in a Global Note, in accordance with the normal procedures of DTC and with the procedures set forth in the indenture.

DTC has advised us that it will take any action permitted to be taken by a holder of notes (including the presentation of notes for exchange as described below) only at the direction of one or more participants to whose

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account the DTC interests in the Global Notes are credited and only in respect of such portion of the aggregate principal amount of notes as to which such participant or participants has or have given such direction. However, if there is an Event of Default under the Indenture, DTC will exchange the Global Notes for Certificated Securities, which it will distribute to its participants.

DTC has advised us as follows: DTC is a limited purpose trust company organized under the laws of the State of New York, a member of the Federal Reserve System, a “clearing corporation” within the meaning of the Uniform Commercial Code and a “Clearing Agency” registered pursuant to the provisions of Section 17A of the Exchange Act. DTC was created to hold securities for its participants and facilitate the clearance and settlement of securities transactions between participants through electronic book-entry changes in accounts of its participants, thereby eliminating the need for physical movement of certificates. Participants include securities brokers and dealers, banks, trust companies and clearing corporations and certain other organizations. Indirect access to the DTC system is available to others such as banks, brokers, dealers and trust companies that clear through or maintain a custodial relationship with a participant, either directly or indirectly (“indirect participants”).

Although DTC has agreed to the foregoing procedures in order to facilitate transfers of interests in the Global Note among participants of DTC, it is under no obligation to perform such procedures, and such procedures may be discontinued at any time. Neither we nor the trustee will have any responsibility for the performance by DTC or its participants or indirect participants of their respective obligations under the rules and procedures governing their operations.

Certificated Securities

Certificated Securities shall be issued in exchange for beneficial interests in the Global Notes (i) if requested by a holder of such interests or (ii) if DTC is at any time unwilling or unable to continue as a depositary for the Global Notes and a successor depositary is not appointed by us within 90 days.

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