Clean Harbors Announces Appointment of Deirdre J. Evens to the Position of Executive Vice President

NORWELL, Mass.--(BUSINESS WIRE)--June 7, 2007--Clean Harbors, Inc. ("Clean Harbors") (NASDAQ: CLHB), the leading provider of environmental and hazardous waste management services throughout North America, today announced that the Company has named Deirdre J. Evens, 43, to the position of Executive Vice President of Corporate Sales and Business Development effective June 4, 2007. Evens will report to Clean Harbors' Chief Executive Officer Alan S. McKim. Ms. Evens will have responsibility for implementing key national and vertical account programs. She also will be responsible for directing and overseeing business development programs across the U.S. and Canada.

"We're very excited to have Deirdre join our executive team," said McKim. "Deirdre's extensive marketing and operational experience, as well as her proven leadership in managing key segments of major national companies will be a valuable asset to Clean Harbors' expanding operations and continued growth."

Most recently Evens served as Senior Vice President, Member Insight at BJ's Wholesale Club, an $8 billion Fortune 300 retailer and the leading warehouse chain in the eastern United States. In this role, she led the company's strategy, analytics and segment marketing functions, with responsibility for identifying and driving club member insights into actionable business improvements throughout all retail functions.

Prior to BJ's, Evens held a series of positions of increasing responsibility at Polaroid Corporation, a leading worldwide manufacturer of instant and digital imaging products and consumer electronics products, culminating in her appointment as Senior Vice President of Worldwide Marketing and Business Strategy. Her experience at Polaroid included leadership roles in the areas of New Product Development, Plant Management, Sales, Marketing, and Global Business Unit Management. Evens holds a Bachelor of Science degree in Mechanical Engineering from Cornell University. She is married with five children and lives with her family in Framingham, MA.

About Clean Harbors, Inc.

Clean Harbors, Inc. is North America's leading provider of environmental and hazardous waste management services. With an unmatched infrastructure of 49 waste management facilities, including nine landfills, six incineration locations and six wastewater treatment centers, the Company provides essential services to over 45,000 customers, including more than 325 Fortune 500 companies, thousands of smaller private entities and numerous federal, state and local governmental agencies. 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 successfully integrate Teris'
        operations and assets into its existing network of services
        and disposal facilities;

    --  The Company's ability to manage the significant environmental
        liabilities that it assumed in connection with the CSD and
        Teris 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 the Investor portal of the Company's Web Page at www.cleanharbors.com.

    CONTACT: James M. Rutledge
             Executive Vice President and Chief Financial Officer
             Clean Harbors, Inc.
             781.792.5100
             InvestorRelations@cleanharbors.com
             or
             Bill Geary
             Executive Vice President and General Counsel
             Clean Harbors, Inc.
             781.792.5130
             or
             Jim Buckley
             Executive Vice President
             Sharon Merrill Associates, Inc.
             617.542.5300
             clhb@investorrelations.com

    SOURCE: Clean Harbors