Based on the consents received on or prior to the Consent Date, Clean Harbors and the trustee under the Indenture are expected to enter into a supplemental indenture that will, once operative, eliminate substantially all of the restrictive covenants and certain events of default and reduce the required notice period contained in the optional redemption provisions of the Indenture. The supplemental indenture is expected to become operative upon payment for the 2016 Notes tendered by the Consent Date as described above.Requests for copies of the Offer to Purchase and other documents relating to the Tender Offer may be directed to Global Bondholder Services Corp., the Information Agent, at (866) 794-2200 or (212) 430-3774. Goldman, Sachs & Co. is acting as Dealer Manager and Solicitation Agent for the Tender Offer. Questions regarding the Tender Offer may be directed to Goldman, Sachs & Co. at (800) 828-3182 and (212) 357-0345. This press release is not an offer to purchase or solicitation of consents with respect to the 2016 Notes. The Tender Offer is only being made pursuant to the Offer to Purchase and the related Letter of Transmittal and Consent. Safe Harbor Statement Any statements contained herein that are not historical facts are forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. These forward-looking statements are generally identifiable by use of the words “believes,” “expects,” “intends,” “anticipates,” “plans to,” “estimates,” “projects,” or similar expressions. Such statements may include, but are not limited to, statements about Clean Harbors’ business outlook and financial guidance and other statements that are not historical facts. Such statements are based upon the beliefs and expectations of Clean Harbors’ management as of this date only and are subject to certain risks and uncertainties that could cause actual results to differ materially, including, without limitation, those items identified as “risk factors” in Clean Harbors’ most recently filed Form 10-K and Form 10-Q. Therefore, readers are cautioned not to place undue reliance on these forward-looking statements. Clean Harbors undertakes no obligation to revise or publicly release the results of any revision to these forward-looking statements other than through its various filings with the Securities and Exchange Commission, which may be viewed in the “Investors” section of Clean Harbors’ website at www.cleanharbors.com. About Clean Harbors Clean Harbors is the leading provider of environmental, energy and industrial services throughout North America. Clean Harbors serves more than 60,000 customers, including a majority of the Fortune 500 companies, thousands of smaller private entities and numerous federal, state, provincial and local governmental agencies. Headquartered in Norwell, Massachusetts, Clean Harbors has more than 200 locations, including over 50 waste management facilities, throughout North America in 37 U.S. states, seven Canadian provinces, Mexico and Puerto Rico. For more information, visit www.cleanharbors.com.