Amended and Restated Confirmation and Ratification of Ancillary Loan Documents dated as of October 28, 2020 among Clean Harbors, Inc., as the U.S. Borrower, Clean Harbors Industrial Services Canada, Inc., as the Canadian Borrower, the subsidiaries of Clean Harbors, Inc. listed on Annex A thereto or that thereafter become a party thereto as Grantors, and Bank of America, N.A., as Agent for its own benefit and the benefit of the other Lenders and Credit Parties

This Amended and Restated Confirmation and Ratification of Ancillary Loan Documents (this “Agreement”) is made as of the 28th day of October, 2020 by and among:

CLEAN HARBORS, INC., a Massachusetts corporation (the “U.S. Borrower”), CLEAN HARBORS INDUSTRIAL SERVICES CANADA, INC., an Alberta corporation (the “Canadian Borrower”) and EACH OTHER LOAN PARTY LISTED ON THE SIGNATURE PAGES HERETO (together with the U.S. Borrower and the Canadian Borrower, each such Person, individually, an “Existing Grantor”, and collectively, the “Existing Grantors”); and

BANK OF AMERICA, N.A., a national banking association, as administrative agent (in such capacity, the “Agent”) for its own benefit and the benefit of the other Lenders and Credit Parties

in consideration of the mutual covenants herein contained and benefits to be derived herefrom.

WHEREAS, the Agent, the U.S. Borrower and the Canadian Borrower previously entered into a certain Fifth Amended and Restated Credit Agreement dated as of November 1, 2016 (as heretofore amended, the “Existing Credit Agreement”); and

WHEREAS, in connection with the Existing Credit Agreement, the Existing Grantors executed and/or delivered to the Agent, for the benefit of the Lenders and Credit Parties named therein, among other documents, instruments and agreements, those documents, instruments and agreements set forth on Schedule I hereto (as amended, modified, supplemented or restated and in effect from time to time, the “Ancillary Loan Documents”); and

WHEREAS, the Agent, the U.S. Borrower and the Canadian Borrower have agreed to amend and restate the Existing Credit Agreement in its entirety pursuant to a certain Sixth Amended and Restated Credit Agreement of even date herewith (as amended, modified, supplemented or restated and in effect from time to time, the “Restated Credit Agreement”); and

WHEREAS, in connection with the execution and delivery of the Restated Credit Agreement, among other things, the Existing Grantors and the Agent desire to enter into this Agreement to set forth their respective understanding with respect to the continued effectiveness of the Ancillary Loan Documents.

NOW, THEREFORE, it is hereby agreed by and among the Existing Grantors and the Agent, for the benefit of the Lenders and the other Credit Parties, as follows:

1.Definitions. Unless otherwise defined herein, all capitalized terms used herein shall have the meaning set forth in the Restated Credit Agreement, or in the Ancillary Loan Documents, as applicable.

2.General Amendment to Ancillary Loan Documents. Any and all references in the Ancillary Loan Documents to the “Credit Agreement” shall hereafter be deemed to mean and refer to the Sixth Amended and Restated Credit Agreement dated as of the date hereof by and among: (a) the U.S. Borrower, (b) the Canadian Borrower, (c) the Agent and (d) the Lenders party thereto, as amended, modified, supplemented or restated and in effect from time to time.

3.Confirmation and Ratification of Ancillary Loan Documents.

(a)Each of the Existing Grantors hereby ratifies and confirms all of the terms and conditions of, and all of the warranties and representations set forth in, each of the Ancillary Loan Documents to which it is a party, and each of the Existing Grantors acknowledges and agrees that each of the Ancillary Loan Documents (including any schedules and exhibits thereto), as amended by this Agreement, remains in full force and effect.

(b)Each of the U.S. Facility Loan Parties hereby acknowledges, confirms and agrees that the Ancillary Loan Documents to which it is a party, and any and all Collateral previously pledged to the Agent, for the benefit of the U.S. Facility Secured Parties, pursuant thereto, shall continue to guarantee or secure, as applicable, all U.S. Facility Obligations and all Canadian Facility Obligations at any time and from time to time outstanding under the Restated Credit Agreement and the Ancillary Loan Documents and any other Loan Documents, as such U.S. Facility Obligations and Canadian Facility Obligations have been, and may hereafter be, amended, restated, supplemented, increased or otherwise modified from time to time.

(c)Each of the Canadian Facility Loan Parties hereby acknowledges, confirms and agrees that the Ancillary Loan Documents to which it is a party, and any and all Collateral previously pledged to the Agent, for the benefit of the Secured Parties, pursuant thereto, shall continue to guarantee or secure, as applicable, all Canadian Facility Obligations at any time and from time to time outstanding under the Restated Credit Agreement and the Ancillary Loan Documents and any other Loan Documents, as such Canadian Facility Obligations have been, and may hereafter be, amended, restated, supplemented, increased or otherwise modified from time to time.

(d)Each of the Existing Grantors hereby acknowledges, confirms and agrees that nothing herein shall constitute a novation or accord and satisfaction with respect to the Ancillary Loan Documents or any other Loan Documents.

4.Miscellaneous.

(a)Each Existing Grantor represents and warrants that (i) the execution, delivery and performance of this Agreement have been duly authorized by all necessary

action, (ii) it has duly executed and delivered this Agreement, and (iii) this Agreement is a legal, valid and binding obligation of such Person, enforceable against such Person in accordance with its terms, except as may be limited by applicable requirements of law.

(b)This Agreement may be executed in several counterparts and by each party on a separate counterpart, each of which when so executed and delivered, shall be an original, and all of which together shall constitute one instrument. Delivery of executed counterparts of signature pages to this Agreement by facsimile or other electronic transmission shall be effective as delivery of manually executed counterparts hereof.

(c)Each Existing Grantor hereby acknowledges and agrees that this Agreement shall constitute a “Loan Document” under the Restated Credit Agreement.

(d)This Agreement expresses the entire understanding of the parties with respect to the matters set forth herein. No prior discussions or negotiations shall limit, modify, or otherwise affect the provisions hereof.

(e)Any determination that any provision of this Agreement or any application hereof is invalid, illegal or unenforceable in any respect and in any instance shall not affect the validity, legality, or enforceability of such provision in any other instance, or the validity, legality or enforceability of any other provisions of this Agreement.

(f)The Existing Grantors, at the Existing Grantors’ expense, shall execute such additional documents and undertake such additional actions as the Agent may reasonably request in order to more fully confirm, vest and perfect the Agent’s security interests and liens in the Collateral which is the subject of the Ancillary Loan Documents.

(g)THIS AGREEMENT SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK, WITHOUT GIVING EFFECT TO THE CONFLICTS OF LAWS PRINCIPLES THEREOF (BUT GIVING EFFECT TO SECTION 5-1401 OF THE NEW YORK GENERAL OBLIGATION LAW AND FEDERAL LAWS RELATING TO NATIONAL BANKS).

(h)EACH EXISTING GRANTOR HEREBY WAIVES, TO THE FULLEST EXTENT PERMITTED BY APPLICABLE LAW, ANY RIGHT IT MAY HAVE TO A TRIAL BY JURY (WHICH THE AGENT HEREBY ALSO WAIVES) IN ANY PROCEEDING or dispute of any kind relating in any way to THIS AGREEMENT, any OTHER Loan Document OR THE TRANSACTIONS CONTEMPLATED HEREBY (WHETHER BASED ON CONTRACT, TORT OR ANY OTHER THEORY); AND WAIVES DUE DILIGENCE, DEMAND, PRESENTMENT AND PROTEST AND ANY NOTICES THEREOF AS WELL AS NOTICE OF NONPAYMENT. EACH PARTY HERETO (I) CERTIFIES THAT NO REPRESENTATIVE, AGENT OR ATTORNEY OF ANY OTHER PARTY HAS REPRESENTED, EXPRESSLY OR OTHERWISE, THAT SUCH OTHER PARTY WOULD NOT, IN THE EVENT OF LITIGATION, SEEK TO ENFORCE THE FOREGOING WAIVERS, AND (II)

ACKNOWLEDGES THAT IT AND THE OTHER PARTIES HERETO HAVE BEEN INDUCED TO ENTER INTO THIS AGREEMENT BY, AMONG OTHER THINGS, THE MUTUAL WAIVERS AND CERTIFICATIONS IN THIS PARAGRAPH.

(i)As of the date hereof, this Agreement amends, restates and supersedes in its entirety that certain Confirmation and Ratification Agreement dated as of November 1, 2016 (as in effect immediately prior to effectiveness of this Agreement, the “Original Ratification Agreement”) between U.S. Borrower, Canadian Borrower, each other Loan Party listed on the signature pages thereto and Agent, and (ii) from and after the date hereof, the rights and obligations of the parties to the Original Ratification Agreement shall be governed by this Agreement instead.

a.PPSA Original Registration No. 11052624787 (as amended), naming Agent as the secured party and Clean Harbors Energy and Industrial Services Corp., Clean Harbors Energy and Industrial Services LP, Clean Harbors Energy and Industrial Western Ltd., Clean Harbors Exploration Services LP, Clean Harbors Exploration Services, ULC, Clean Harbors Industrial Services Canada, Inc., Clean Harbors Lodging Services, ULC, Clean Harbors Lodging Services LP, Envirosort Inc., Tri-Vax Enterprises Ltd., Clean Harbors Canada, Inc., Services Environnementaux Clean Harbors Mercier, Inc./Clean Harbors Mercier, Inc., Services Environnementaux Clean Harbors Mercier, Inc., Clean Harbors Mercier, Inc., Clean Harbors Mercier, Inc./Services Environnementaux Clean Harbors Mercier, Inc., Services Environnementaux Clean Harbors Quebec, Inc./Clean Harbors Quebec, Inc., Services Environnementaux Clean Harbors Quebec, Inc., Clean Harbors Quebec, Inc., Clean Harbors Quebec, Inc./Services Environnementaux Clean Harbors Quebec, Inc., Clean Harbors Surface Rentals Partnership, Sanitherm, ULC, BCT Structures, ULC, Versant Energy Services,

LP, Clean Harbors Energy Services, ULC, Clean Harbors Production Services, ULC, Grizzco Camp Services, ULC Clean Harbors Surface Rentals, ULC, Lonestar West Inc., Lonestar Sylvan Inc., Lonestar Vacuum Inc. and Safety-Kleen Canada Inc. as debtors, originally filed on May 26, 2011 (Alberta).

b.PPSA Reference File No. 670194594 (as amended), naming Agent as the secured party and Clean Harbors Energy and Industrial Services Corp., Clean Harbors Energy and Industrial Services LP, Clean Harbors Energy and Industrial Western Ltd., Clean Harbors Exploration Services LP, Clean Harbors Exploration Services, ULC, Clean Harbors Industrial Services Canada, Inc., Clean Harbors Lodging Services, ULC, Clean Harbors Lodging Services LP, Envirosort Inc., Tri-Vax Enterprises Ltd., Clean Harbors Canada LP, Clean Harbors Canada, Inc., Services Environnementaux Clean Harbors Mercier, Inc./Clean Harbors Mercier, Inc., Services Environnementaux Clean Harbors Mercier, Inc., Clean Harbors Mercier, Inc., Clean Harbors Mercier, Inc./Services Environnementaux Clean Harbors Mercier, Inc., Services Environnementaux Clean Harbors Quebec, Inc./Clean Harbors Quebec, Inc., Services Environnementaux Clean Harbors Quebec, Inc., Clean Harbors Quebec, Inc., Clean Harbors Quebec, Inc./Services Environnementaux Clean Harbors Quebec, Inc., Clean Harbors Surface Rentals Partnership, Clean Harbors Surface Rentals Ltd., Sanitherm, ULC, Clean Harbors Surface Rentals, ULC, Versant Energy Services, LP, Clean Harbors Energy Services, ULC, Vulsay Industries Ltd., Clean Harbors Production Services, ULC, Lonestar West Inc., Lonestar Sylvan Inc., Lonestar Vacuum Inc., BCT Structures, ULC, Safety-Kleen Canada Inc. and Grizzco Camp Services, ULC as debtors, originally filed on May 27, 2011 (Ontario).

c.PPSA Original Registration No. 20152351 (as amended), naming Agent as the secured party and Clean Harbors Energy and Industrial Services Corp., Clean Harbors Energy and Industrial Services LP, Clean Harbors Energy and Industrial Western Ltd., Clean Harbors Exploration Services LP, Clean Harbors Exploration Services, ULC, Clean Harbors Industrial Services Canada, Inc., Clean Harbors Lodging Services, ULC, Clean Harbors Lodging Services LP, Envirosort Inc., Tri-Vax Enterprises Ltd., Clean Harbors Canada LP, Clean Harbors Canada, Inc., Services Environnementaux Clean Harbors Mercier, Inc./Clean Harbors Mercier, Inc., Services Environnementaux Clean Harbors Mercier, Inc., Clean Harbors Mercier, Inc., Clean Harbors Mercier, Inc./Services Environnementaux Clean Harbors Mercier, Inc., Services Environnementaux Clean Harbors Quebec, Inc./Clean Harbors Quebec, Inc., Services Environnementaux Clean Harbors Quebec, Inc., Clean Harbors Quebec, Inc., Clean Harbors Quebec, Inc./Services Environnementaux Clean Harbors Quebec, Inc., Clean Harbors Surface Rentals Partnership, Clean Harbors Surface Rentals Ltd., Sanitherm, ULC, Clean Harbors Surface Rentals, ULC and Safety-Kleen Canada Inc. as debtors, originally filed on May 30, 2011 (New Brunswick).

d.PPSA Original Registration No. 18124412 (as amended), naming Agent as the secured party and Clean Harbors Energy and Industrial Services Corp., Clean

Harbors Energy and Industrial Services LP, Clean Harbors Energy and Industrial Western Ltd., Clean Harbors Exploration Services LP, Clean Harbors Exploration Services, ULC, Clean Harbors Industrial Services Canada, Inc., Clean Harbors Lodging Services, ULC, Clean Harbors Lodging Services LP, Envirosort Inc., Tri-Vax Enterprises Ltd., Clean Harbors Canada LP, Clean Harbors Canada, Inc., Services Environnementaux Clean Harbors Mercier, Inc./Clean Harbors Mercier, Inc., Services Environnementaux Clean Harbors Mercier, Inc., Clean Harbors Mercier, Inc., Clean Harbors Mercier, Inc./Services Environnementaux Clean Harbors Mercier, Inc., Services Environnementaux Clean Harbors Quebec, Inc./Clean Harbors Quebec, Inc., Services Environnementaux Clean Harbors Quebec, Inc., Clean Harbors Quebec, Inc., Clean Harbors Quebec, Inc./Services Environnementaux Clean Harbors Quebec, Inc., Clean Harbors Surface Rentals Partnership, Clean Harbors Surface Rentals Ltd., Sanitherm, ULC, Clean Harbors Surface Rentals, ULC and Safety-Kleen Canada Inc. as debtors, originally filed on May 30, 2011 (Nova Scotia).

e.RDPRM Registration No. 11-0385068-0003, naming Agent as the secured party and Services Environnementaux Clean Harbors Mercier, Inc. and Clean Harbors Mercier, Inc. as debtor, originally filed on May 26, 2011 (Quebec).

f.RDPRM Registration No. 11-0385068-0002, naming Agent as the secured party and Services Environnementaux Clean Harbors Quebec, Inc. and Clean Harbors Quebec, Inc. as debtor, originally filed on May 26, 2011 (Quebec).

g.PPSA Original Registration No. 808709G (as amended), naming Agent as the secured party and Clean Harbors Industrial Services Canada, Inc., Clean Harbors Canada, Inc., Grizzco Camp Services, ULC, Lonestar West Inc., Lonestar Sylvan Inc., Lonestar Vacuum Inc., Clean Harbors Production Services ULC, Clean Harbors Surface Rentals Partnership, Clean Harbors Surface Rentals, ULC and Safety-Kleen Canada Inc. as debtors, originally filed on June 21, 2012 (British Columbia).

h.PPSA Original Registration No. 300886936 (as amended), naming Agent as the secured party and Clean Harbors Industrial Services Canada, Inc., Lonestar West Inc., Lonestar Sylvan Inc., Lonestar Vacuum Inc., Clean Harbors Lodging Services LP, Clean Harbors Lodging Services, ULC, Clean Harbors Production Services, ULC and Safety-Kleen Canada Inc. as debtors, originally filed on June 21, 2012 (Saskatchewan).

i.PPSA Original Registration No. 201210732808 (as amended), naming Agent as the secured party and Clean Harbors Industrial Services Canada, Inc., Clean Harbors Canada, Inc., Lonestar West Inc., Lonestar Sylvan Inc. and Lonestar Vacuum Inc. as debtors, originally filed on June 21, 2012 (Manitoba).

j.PPSA Original Registration No. 22495030, naming Agent as the secured party and Safety-Kleen Canada Inc. as debtor, originally filed on January 4, 2013 (New Brunswick).

k.RDPRM Registration No. 13-008141-0001, naming Agent as the secured party and Safety-Kleen Canada Inc. as debtor, originally filed on January 8, 2013 (Quebec).

l.PPSA Original Registration No. 13011110484 (as amended), naming Agent as the secured party and Clean Harbors Industrial Services Canada, Inc. as a debtor, originally filed on January 11, 2013 (Alberta).

m.PPSA Reference File No. 716041368, naming Agent as the secured party and Vulsay Industries Ltd. as a debtor, originally filed on April 27, 2016 (Ontario).

n.PPSA Original Registration No. 14011977, naming Agent as secured party and Clean Harbors Innu Environmental Services, Inc. as a debtor, originally filed on June 13, 2016 (Newfoundland and Labrador).

o.RDPRM Registration No. 16 ###-###-####, naming Agent as the secured party and Clean Harbors Canada Inc. as a debtor, originally filed on November 25, 2016 (Quebec).

3. Second Amended and Restated Security Agreement (U.S. Domiciled Loan Parties), dated June 30, 2017, by and among Agent, Clean Harbors, Inc. and each of the subsidiaries of Clean Harbors, Inc. party thereto.