Clean Harbors Forms Alliance with MODEC, Inc.; Leading Environmental Firm Receives Exclusive Rights to Deploy New Biocide Products for Anthrax Decontamination.

Business Editors

BRAINTREE, Mass.--(BUSINESS WIRE)--Nov. 29, 2001

Clean Harbors, Inc. (Nasdaq: CLHB), the nation's premier responder to biological/environmental, petroleum, and chemical emergencies, today announced that it has established a strategic alliance with Modec, Inc. A privately held company, Denver-based Modec is licensed to commercialize the formulation developed by Sandia National Laboratories to decontaminate anthrax and other biological agents.

"This alliance strengthens the abilities of both our organizations to respond to a National emergency," stated Gene Cookson, chief operating officer of Clean Harbors, Inc. "Since the first confirmed reports of anthrax, Clean Harbors Environmental Services has been on the front lines decontaminating a number of private and governmental facilities. Some of the more publicized projects involved anthrax remediation at the headquarters of two U.S. television networks, a critical mail handling facility and the district offices of a member of Congress. Although these projects were successful, there is a demonstrable need for more advanced decontamination technologies. Adding Modec's cutting-edge biocide formulation to the Clean Harbors arsenal is an important step toward meeting this need - not only for anthrax, but for a variety of biological agents."

Cookson continued, "The big challenge in decontaminating commercial facilities and offices is dealing with porous materials, furnishings and valuable electronic equipment. Until now, it has often been necessary to dispose of all paper products, ceiling tiles, rugs and electronic and office equipment. That is because traditional decontaminating products, which typically involve bleach dissolved in large quantities of water, are destructive to these items. But Modec's foam and fogging technology allows an entire room or facility to be permeated with a non-toxic and non-corrosive product, while using nearly 98 percent less water. Within one hour, the contaminant is destroyed, and the client is back in business."

In response to a national initiative to combat domestic chemical and biological warfare threats, in 1997 Sandia National Laboratories launched a program to develop effective decontamination technology. The program was funded by the Department of Energy's National Nuclear Security Administration, through its Chemical and Biological National Security Program. The resulting formulation can be deployed as a foam, liquid spray or fog. Modec, Inc. has been authorized by Sandia National Laboratories as a commercial licensee, assigned to develop products and equipment for dispensing the biocide formulation with an effective disinfection rate.

Cookson concluded, "Clean Harbors is continually striving to identify the most technologically sophisticated techniques, products and systems to protect public health and the environment. Equipping our service organization with Modec's products will enable us to penetrate additional markets, including some governmental agencies where Modec is well known. Aligning Clean Harbors with Modec will also reinforce our reputation as a leader in the fight against a variety of terrorist infectious attacks, as Modec's products are also effective against smallpox and other biological agents."

About Modec, Inc.

Modec designs and manufactures complete biological and chemical decontamination systems for use by U.S. government agencies and international, state and local authorities. The Company intends to market the Sandia decontamination formulation for military applications and domestically for public and private uses. The formulation neutralizes both chemical and biological agents and can begin decontaminating a disaster scene even before a specific contaminant has been identified. It is non-toxic, non-corrosive, and environmentally friendly. The basic formulation can be deployed as a foam, mist, fog, spray, or liquid and may be used on a variety of hazardous materials. (For more information, see www.deconsolutions.com/press.htm)

About Clean Harbors, Inc.

Clean Harbors, Inc. 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 national footprint, the Company currently has service and sales offices located in 27 states and Puerto Rico, and operates 12 waste management facilities strategically located throughout the country. For more information, visit our Website at www.cleanharbors.com.