Clean Harbors Names Mark S. Burgess as Chief Financial Officer; Burgess Brings More Than 17 Years of Corporate Finance and Merchant Banking Experience to Company.

Business Editors/Environment Writers

BRAINTREE, Mass.--(BUSINESS WIRE)--June 19, 2003

Clean Harbors, Inc. ("Clean Harbors") (NASDAQ: CLHB), the leading provider of hazardous waste and environmental management services throughout North America, today named Mark S. Burgess, 44, as the Company's Executive Vice President of Administration and Chief Financial Officer. Burgess succeeds Roger Koenecke, who has decided to leave the Company for personal reasons.

"When we acquired Safety-Kleen's Chemical Services Division (CSD) last year, we began implementing a plan to recruit select executives from outside Clean Harbors to expand and augment the management team required to run our larger organization," said Alan S. McKim, Chairman and Chief Executive Officer of Clean Harbors. "The addition of Mark Burgess represents an important step forward as we continue to execute this plan. Along with a background in acquisition lending and investment banking, where he gained credit, debt and M&A experience, Mark brings Clean Harbors a record of achievement in industrial sector financial management, including over 12 years as a CFO with two companies comparable in size to Clean Harbors. We expect that Mark's involvement will be instrumental in our successful completion of the CSD integration process, and that his presence on our management team will help us further strengthen the Company's financial position."

Before joining Clean Harbors, Burgess was CFO of JL French Automotive Castings, Inc., one of the largest independent manufacturers of aluminum die castings in the world. During that time, JL French reported annual revenues exceeding $500 million, and employed more than 3,500 people located in the United States, United Kingdom, Mexico, and Spain. Previously, Burgess was with Trailmobile Corporation, a leading manufacturer of trailers and semi-trailers, where he was CFO of the corporation, and later served as President of its Canadian subsidiary. Prior to that, Burgess spent five years with Chase Manhattan Bank focusing on acquisition lending and M&A transactions. Burgess holds a Bachelor of Arts degree from Dickinson College and a Master of Business Administration degree from The Fuqua School of Business at Duke University.

McKim continued, "I want to thank Roger Koenecke for his dedicated service to Clean Harbors. Roger's commitment, expertise and professionalism has been integral to the Company's growth and to our ability to purchase CSD. I am grateful that Roger will remain available to our management team to ensure a smooth transition."

About Clean Harbors, Inc.

Clean Harbors, Inc. through its subsidiaries provides a wide range of environmental and waste management services to a diversified customer base including a majority of the Fortune 500 companies, thousands of smaller private entities and numerous governmental agencies. Within its international footprint, Clean Harbors has service and sales offices located in 36 states, six Canadian provinces, Mexico, and Puerto Rico, and operates 52 waste management facilities strategically located throughout North America. For more information, visit our Web site at www.cleanharbors.com.