Clean Harbors, Inc. (“Clean Harbors”) (NYSE:CLH), the leading provider of environmental, energy and industrial services throughout North America, today announced that Laura Schwinn has been appointed as President, Oil & Gas Field Services, effective March 4, 2013. “With almost two decades of experience as a recognized industry leader, Laura brings valuable perspective and keen insights to Clean Harbors,” said Alan S. McKim, Chairman and Chief Executive Officer of Clean Harbors. “Born and raised in Calgary, Alberta, Laura began her career in the Calgary oil patch, and expanded her career in the oil and gas industry in various roles around the world. Attracting a proven and seasoned executive to this newly formed position is an important milestone for our Oil & Gas Field Services business. The North American energy industry is currently undergoing a major transformation and entering a phase of rapid growth. Laura’s expertise in this sector will enable us to best position Clean Harbors to capitalize on the short- and long-term opportunities presented by the evolving needs of the major energy producers. We believe Laura is an ideal fit for Clean Harbors and look forward to her leading this business into its next stage of growth.” Previously, Schwinn held a variety of senior positions at Halliburton, most recently as Vice President, Drill Bits and Services. Prior to Halliburton, Schwinn served in a business development role at Schlumberger. Schwinn earned a Bachelor of Commerce degree from University of Victoria in British Columbia. About Clean Harbors Clean Harbors (NYSE:CLH) is the leading provider of environmental, energy and industrial services throughout North America. The Company serves a diverse customer base, including a majority of the Fortune 500 companies, thousands of smaller private entities and numerous federal, state, provincial and local governmental agencies. Through its Safety-Kleen subsidiary, Clean Harbors also is a premier provider of used oil recycling and re-refining, parts cleaning and environmental services for the small quantity generator market. Headquartered in Massachusetts, Clean Harbors has waste disposal facilities and service locations throughout the United States and Canada, as well as 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. These forward-looking statements are generally identifiable by use of the words “believes,” “expects,” “intends,” “anticipates,” “plans to,” “estimates,” “projects,” or similar expressions. Such statements may include, but are not limited to, statements about the North American energy industry and other statements that are not historical facts. Such statements are based upon the beliefs and expectations of Clean Harbors’ management as of this date only and are subject to certain risks and uncertainties that could cause actual results to differ materially, including, without limitation, those items identified as “risk factors” in Clean Harbors’ most recently filed Form 10-K and Form 10-Q. Therefore, readers are cautioned not to place undue reliance on these forward-looking statements. Clean Harbors undertakes no obligation to revise or publicly release the results of any revision to these forward-looking statements other than through its filings with the Securities and Exchange Commission, which may be viewed in the “Investors” section of Clean Harbors’ website at www.cleanharbors.com.