CLHB Clean Harbors (MM)

Clean Harbors, Inc. (NASDAQ: CLHB), the leading provider of environmental and hazardous waste management services throughout North America, will host its first-quarter 2006 conference call on Thursday, May 4, 2006 at 9:00 a.m. ET. On the call, Chairman, President and Chief Executive Officer Alan McKim and Executive Vice President and Chief Financial Officer James M. Rutledge will discuss Clean Harbors' financial results, business outlook and growth strategy. Those who wish to listen to the first-quarter conference call webcast should visit the Investor Relations section of the Company's website at www.cleanharbors.com. The live call also can be accessed by dialing (888) 349-5690 or (706) 643-3945 (conference ID: 7688763) prior to the start of the call. If you are unable to listen to the live call, the webcast 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.