Clean Harbors Invites You To Join Its Fourth-Quarter And Year-End 2004

    Business Editors/Financial Editors

    BRAINTREE, Mass.--(BUSINESS WIRE)--March 7, 2005--Clean Harbors, Inc. (NASDAQ: CLHB), the leading provider of hazardous waste and environmental management services throughout North America, will webcast its fourth-quarter and year-end conference call live over the Internet on Tuesday, March 15, 2005 at 9:00 a.m. ET.
    The conference call will follow the issuance of the Company's fourth-quarter and year-end news release, which will be available prior to the call. On the call, Chairman, President and Chief Executive Officer Alan McKim and Executive Vice President of Administration and Chief Financial Officer Mark Burgess will discuss Clean Harbors' financial results, business outlook and growth strategy.
    Those who wish to listen to the fourth-quarter and year-end conference call should visit the investor section of the Company's website at www.cleanharbors.com. In addition, if you are unable to listen to the live webcast, the call will be archived on the investor section of Clean Harbors' website.

    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 48 waste management facilities, including nine landfills, five incineration locations and seven wastewater treatment centers, the Company provides essential services to more than 30,000 customers, including more than 175 Fortune 500 companies, thousands of smaller private entities and numerous federal, state and local governmental agencies. Headquartered in Braintree, 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.

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CONTACT: Clean Harbors, Inc. Mark Burgess, 781-849-1800 Executive Vice President of Administration and Chief Financial Officer InvestorRelations@cleanharbors.com or Sharon Merrill Associates, Inc. Jason Fredette, 617-542-5300 Associate Vice President clhb@investorrelations.com

KEYWORD: MASSACHUSETTS INDUSTRY KEYWORD: BANKING ENVIRONMENT CONFERENCE CALLS SOURCE: Clean Harbors, Inc.

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