Clean Harbors Appoints Simon Gerlin Senior Vice President of Finance

    Seasoned Executive Joins Finance Team as Organization Continues
                               Expansion

NORWELL, Mass.--(BUSINESS WIRE)--July 11, 2008--Clean Harbors, Inc. ("Clean Harbors") (NASDAQ: CLHB), the leading provider of environmental and hazardous waste management services throughout North America, today announced the Company has named Simon R. Gerlin, 50, to the newly created position of Senior Vice President of Finance, effective immediately. Gerlin will report to Clean Harbors' Chief Financial Officer, James M. Rutledge. Gerlin will oversee all of the Company's controllership functions, including the corporate controller function and the business unit controller functions. Additionally, Gerlin will play a key role in the Company's internal audit function going forward.

"We are excited that someone of Simon's caliber has joined our finance team," said James M. Rutledge, Executive Vice President and Chief Financial Officer. "As a former partner at PwC, Gerlin's extensive experience will strengthen Clean Harbors' overall accounting and finance organization, and help shape our audit infrastructure. Realizing these two objectives is essential for Clean Harbors as we pursue our goal of exceeding a billion dollars in annual revenue."

Prior to joining Clean Harbors, Gerlin worked at PricewaterhouseCoopers for nearly 17 years, where he held positions of increasing responsibility, culminating in his appointment as Audit Partner in 1999. While at PwC, Gerlin worked with many of the firm's key clients in multiple industries to conduct their financial audits and oversee other financial and strategic initiatives. Gerlin launched his career in the advertising field, serving as an account executive with premier New York-based agencies, including Young & Rubicam, BBDO, and NW Ayer.

Gerlin received a Bachelor of Arts degree from Middlebury College and a Master of Business Administration from Harvard University Graduate School of Business.

About Clean Harbors

Clean Harbors is North America's leading provider of environmental and hazardous waste management services. With an unmatched infrastructure of waste management facilities, Clean Harbors serves over 45,000 customers, including more than 325 Fortune 500 companies, thousands of smaller private entities and numerous federal, state and local governmental agencies. Clean Harbors' Technical Services provides a broad range of hazardous material management and disposal services including hazardous and non-hazardous waste recycling, treatment and disposal, CleanPack(R) laboratory chemical packing, and household hazardous waste management services. Clean Harbors' Site Services provides field services, industrial services, vacuum services, emergency response and disaster recovery, transformer services, tank cleaning and decontamination.

Headquartered in Norwell, Massachusetts, Clean Harbors has more than 100 locations strategically positioned throughout North America in 36 U.S. states, six Canadian provinces, Mexico and Puerto Rico. For more information, visit www.cleanharbors.com.

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, and involve risks and uncertainties. These forward-looking statements are generally identifiable by use of the words "believes," "expects," "intends," "anticipates," "plans to," "estimates," "projects," or similar expressions. These forward-looking statements are subject to certain risks and uncertainties that could cause actual results to differ materially from those reflected in these forward-looking statements. Readers are cautioned not to place undue reliance on these forward-looking statements, which reflect management's opinions only as of the date hereof. The Company 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. Furthermore, all financial information in this press release is based on preliminary data and is subject to the final closing of the Company's books and records.

A variety of factors beyond the control of the Company may affect the Company's performance, including, but not limited to:

    --  The Company's ability to manage the significant environmental
        liabilities that it assumed in connection with the CSD and
        other acquisitions;

    --  The availability and costs of liability insurance and
        financial assurance required by governmental entities relating
        to our facilities;

    --  The effects of general economic conditions in the United
        States, Canada and other territories and countries where the
        Company does business;

    --  The effect of economic forces and competition in specific
        marketplaces where the Company competes;

    --  The possible impact of new regulations or laws pertaining to
        all activities of the Company's operations;

    --  The outcome of litigation or threatened litigation or
        regulatory actions;

    --  The effect of commodity pricing on overall revenues and
        profitability;

    --  Possible fluctuations in quarterly or annual results or
        adverse impacts on the Company's results caused by the
        adoption of new accounting standards or interpretations or
        regulatory rules and regulations;

    --  The effect of weather conditions or other aspects of the
        forces of nature on field or facility operations;

    --  The effects of industry trends in the environmental services
        and waste handling marketplace; and

    --  The effects of conditions in the financial services industry
        on the availability of capital and financing.

Any of the above factors and numerous others not listed nor foreseen may adversely impact the Company's financial performance. Additional information on the potential factors that could affect the Company's actual results of operations is included in its filings with the Securities and Exchange Commission, which may be viewed on www.cleanharbors.com/investor_relations.

    CONTACT: Clean Harbors, Inc.
             James M. Rutledge, 781-792-5100
             Executive Vice President and Chief Financial Officer
             InvestorRelations@cleanharbors.com
             or
             Clean Harbors, Inc.
             Bill Geary, 781-792-5130
             Executive Vice President and General Counsel
             or
             Sharon Merrill Associates, Inc.
             Jim Buckley, 617-542-5300
             Executive Vice President
             clhb@investorrelations.com

    SOURCE: Clean Harbors, Inc.