Provider of environmental, energy and industrial services. The company is organized into four business units: technical services, industrial and field services, safety-kleen, and oil and gas field services. Technical services provides environmental and hazardous waste management services including the collection, packaging, transportation, recycling, treatment and disposal of hazardous and non-hazardous waste. Industrial and field services provide industrial and specialty services, such as high-pressure and chemical cleaning, catalyst handling, decoking, material processing and industrial lodging services to refineries, chemical plants, pulp and paper mills, and other industrial facilities. Safety-kleen provides a broad set of environmentally-responsible products and services and oil and gas field services provide exploration, surface rentals, solids control, and environmental services to the energy sector serving oil and gas exploration, production, and power generation.