Our History POWERED BY A SINGLE PURPOSE FROM DAY ONE: TO MAKE GREEN WORK. Today, Safety-Kleen is a leading provider of environmental services, oil re-refining and responsible cleaning solutions We are still at the forefront of developing practical green processes for business, just as we were the day the company was founded. In fact, for many years, we were virtually alone. Few people shared our passion for keeping workplaces safe by keeping the environment clean. That passion, and the resulting innovation, punctuates our history with notable firsts and remarkable achievements. Here are key moments in our story: 1954 – 1959 Ben Palmer invents the Parts Washer. The "Safety-Kleen Machine" was a success from the start, and he decided in the early 1960's not to sell his machine, but to lease it to the customer and service it by removing and replenishing the used solvent. 1968 – 1969 Chicago Rawhide acquires Safety-Kleen. 1970 Safety-Kleen opens the first "Reclamation Plant". 1972 – 1973 100,000th Parts Washer sold. 1974 Safety-Kleen spun off from Chicago Rawhide. 1976 RCRA – Resource Conservation and Recovery Act The early 1970's began a new trend in environmental protection. The result was the 1976 Resource Conservation and Recovery Act (RCRA), which introduced and defined the term "hazardous waste." Four years later, the U.S. Environmental Protection Agency (EPA) outlined categories of hazardous waste, as well as appropriate methods of treatment and disposal for each category. 1978 – 1983 Initial Public Offering and Second Public Offering. 1987 Safety-Kleen Oil Recovery Services Launched. 1988 Safety-Kleen maintains record growth. In 1988, Safety-Kleen set a new growth record by increasing earnings more than 20 percent per year for 18 consecutive years. 1998 Safety-Kleen and Laidlaw merge. 2000 Safety-Kleen files for Chapter 11 Bankruptcy. 2003 Safety-Kleen successfully emerges from bankruptcy and completes relocation to Plano, TX. New turnaround strategy is implemented. 2005 After sustained revenue and EBITDA growth, Safety-Kleen obtains new financing. 2006 Refinanced Sr. debt facility and completed $500 million re-capitalization. Received new, improved financial ratings (S&P: BB- and Moody's: B1). 2008 Safety-Kleen introduces EcoPower recycled motor oil to consumers. 2009 Safety-Kleen acquires Atlantic Industrial Services and Gateway Petroleum. 2012 Safety-Kleen is purchased by Clean Harbors, Inc., forming the largest environmental services company in North America, approaching $4 billion in annual revenue.