 In June 1975 Kings County, CA issued a permit to McKay Trucking for the disposal of oil field wastes in the Kettleman Hills area.Subsequently, in 1979, the land was bought by Chemical Waste Management, Inc., a subsidiary of Waste Management, Inc.In 1982, Chemical Waste Management, Inc. received a permit for the processing of PCBs (known carcinogens), and soon after a Class I waste disposal permit that allowed for the processing of nearly any type of hazardous waste.