CLHB Clean Harbors (MM)

Clean Harbors, Inc. (NASDAQ: CLHB), the leading provider of environmental and hazardous waste management services throughout North America, will webcast its second-quarter 2005 conference call live over the Internet on Monday, August 1, 2005 at 9:00 a.m. ET. The conference call will follow the issuance of the Company's second-quarter news release, which will be available prior to the call. On the call, Chairman, President and Chief Executive Officer Alan McKim will discuss Clean Harbors' financial results, business outlook and growth strategy. Those who wish to listen to the second-quarter conference call should visit the Investor Relations section of the Company's website at www.cleanharbors.com. If you are unable to listen to the live webcast, the call will be archived on the Company's 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 over 45,000 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.