Exhibit 4.28L

AMENDMENT NO. 4

AMENDMENT NO. 4 (this “Amendment”), dated as of June 25, 2008, to the Amended and Restated Loan and Security Agreement, dated as of December 1, 2005 (as amended, supplemented and in effect from time to time, the “Loan Agreement”; capitalized terms used herein and not defined herein shall have the meaning set forth in the Loan Agreement) by and among Credit Suisse, as administrative agent for the LC Facility, Bank of America, N.A., as administrative agent for the Revolving Facility and syndication agent for the LC Facility, Banc of America Securities LLC (“BAS”), as sole arranger under the Revolving Facility, Credit Suisse, as sole bookrunner under the LC Facility, Credit Suisse and BAS, as joint lead arrangers under the LC Facility, Clean Harbors, Inc., a Massachusetts corporation (“Parent”), the Canadian Borrowers, and each of the other Subsidiaries of Parent from time to time a party thereto (each such Subsidiary, together with Parent and Canadian Borrowers, a “Credit Party” and, collectively, “Credit Parties”).

W I T N E S S E T H:

WHEREAS, subsection 11.3 of the Loan Agreement permits the Loan Agreement to be amended from time to time;

WHEREAS, the Loan Agreement is being amended at the request of the Borrowers;

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

Section 1.               Amendments.

(a)           The following defined terms shall be added to Section 1 of the Loan Agreement:

“Amendment No. 4” shall mean Amendment No. 4 to this Agreement, dated as of June 25, 2008.

“Amendment No. 4 Effective Date” shall mean the first Business Day on which all conditions precedent set forth in Section 2 of Amendment No. 4 are satisfied.

(b)           Section 9.20 of the Loan Agreement is hereby amended by deleting Section 9.20 in its entirety and replacing it with the following:

9.20         Limitation on Capital Expenditures.  Credit Parties shall not permit the aggregate amount of Capital Expenditures made in each of fiscal years 2008, 2009 and 2010 of Parent to exceed $60.0 million in any such fiscal year; provided, however, that (x) if the aggregate amount of Capital Expenditures made in fiscal years 2008, 2009 or 2010 shall be less than the maximum amount of Capital Expenditures permitted under this Section 9.20 for such fiscal year (before giving effect to any carryover), then an amount of such shortfall not exceeding 50% of such maximum amount (without giving effect to clause (y) below) may be added to the amount of Capital Expenditures permitted under this Section 9.20 for the imme-diately succeeding (but not any other) fiscal year, and (y) in determining whether any amount is available for carryover, the amount expended in any fiscal year shall first be deemed to be from the amount allocated to such fiscal year (before giving effect to any carryover).

Section 2.               Conditions to Effectiveness.  This Amendment shall become effective as of the date (the “Amendment No. 4 Effective Date”) when, and only when (x) the Administrative Agents shall have received counterparts of this Amendment executed by each Credit Party, the Administrative Agents, a number of Lenders sufficient to constitute the Majority LC Facility Lenders and each Revolving Lender and (y) Borrowers shall pay on the Amendment No. 4 Effective Date a cash fee in an amount equal to (i) in the case of each LC Facility Lender that delivers a fully and properly executed signature page to this Amendment at or before the Amendment No. 4 Effective Date, 0.25% of the aggregate amount of the Credit-Linked Deposits held by such LC Facility Lender immediately prior to the Amendment No. 4 Effective Date and (ii) in the case of each Term Loan Lender that delivers a fully and properly executed signature page to this Amendment at or before the Amendment No. 4 Effective Date, 0.25% of the aggregate of the Term Loans held by such Term Loan Lender immediately prior to the Amendment No. 4 Effective Date.  The effectiveness of this Amendment (other than Sections Five, Six and Seven hereof) is conditioned upon the accuracy of the representations and warranties set forth in Section Three hereof.

Section 3.               Representations and Warranties.  In order to induce the Lenders and the Administrative Agents to enter into this Amendment, Borrowers represent and warrant to each of the Lenders and the Administrative Agents that before and after giving effect to this Amendment, (a) no Default or Event of Default exists, has occurred and is continuing or will have occurred and be continuing and (b) all of the representations and warranties in the Loan Agreement are true and complete in all material respects on and as of the date hereof as if made on the date hereof (or, if any such representation or warranty is expressly stated to have been made as of a specific date, as of such specific date).

Section 4.               Reference to and Effect on the Loan Agreement.  On and after the Amendment No. 4 Effective Date, each reference in the Loan Agreement, to “this Agreement,” “hereunder,” “hereof” or words of like import referring to the Loan Agreement, respectively, and in each of the Financing Agreements to “the Loan Agreement,” “thereunder,” “thereof” or words of like import referring to the Loan Agreement shall mean and be a reference to the Loan

Agreement as amended by this Amendment.  The Loan Agreement and each other Financing Agreement, as specifically amended by this Amendment, are and shall continue to be in full force and effect and are hereby in all respects ratified and confirmed.  The execution, delivery and effectiveness of this Amendment shall not, except as expressly provided herein, operate as a waiver of any right, power or remedy of any Lender or any Agent under any of the Financing Agreements, nor constitute a waiver of any provision of any of the Financing Agreements.

Section 5.               Costs, Expenses and Taxes.  Borrowers agree to pay all reasonable costs and expenses of the Administrative Agents in connection with the preparation, execution and delivery of this Amendment and the other instruments and documents to be delivered hereunder, if any, in accordance with the terms of the Loan Agreement.

Section 6.               Execution in Counterparts.  This Amendment may be executed in any number of counterparts and by different parties hereto in separate counterparts, each of which when so executed shall be deemed to be an original and all of which taken together shall constitute but one and the same agreement.  Delivery of an executed counterpart of a signature page to this Amendment by telecopier shall be effective as delivery of a manually executed counterpart of this Amendment.

Section 7.               Governing Law.  THIS AMENDMENT SHALL BE GOVERNED BY THE INTERNAL LAWS OF THE STATE OF NEW YORK (WITHOUT GIVING EFFECT TO PRINCIPLES OF CONFLICTS OF LAW).

[Signature Pages Follow]

REVOLVING ADMINISTRATIVE AGENT,

ACCOUNTS COLLATERAL AGENT AND

US REVOLVING LENDER

BANK OF AMERICA, N.A.,

Individually and as Agent

CANADIAN COLLATERAL AGENT
AND CANADIAN LENDER

BANK OF AMERICA, N.A., CANADA BRANCH

Individually and as Agent

LC FACILITY ADMINISTRATIVE AGENT

AND LC FACILITY COLLATERAL AGENT

CREDIT SUISSE, CAYMAN ISLANDS BRANCH