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Ni {yyd Mr. Frenchi, the current tenant, uses Safety Clean to clean his equipment. He also stores two 55- gallon drums of waste oil and used oil filters on site (11). These drums are located outdoors at the rear of the garage on site, near the northwest corner of the building (13). Mr. Frenchi has the drums removed and digposed of approximately every 3 months by PRC Refinery Service of Patterson, Calif. (11). l In 1979, approximately 1,400 gallons of gasoline leaked into soil and groundwater from an underground storage tank on site (9, 11). The Coxes had the leaky underground storage tank removed approximately 2 months later and replaced it with another tank(14). Four fuel tanks ranging in capacity from 4,000 gallons to 8,000 gallons were excavated from the site in January 1990. The fuel tanks were known to have contained both regular leaded and unleaded gasoline. (15) These tanks were disposed of off site by Cal Coast of Turlock,Calif. (16). As stipulated in CERCLA Section 101 (14) and CERCLA Section 101 (33), unaltered petroleum products do not qualify as CERCLA hazardous substances,contaminants,or pollutants. In addition to the fuel tanks, the 500-gallon waste oil tank was excavated from the area adjacent and north of the fuel tanks in January 1990 (15,16). The waste oil and waste oil sludge from the tank were transported off site by California Oil Recyclers and disposed of by Evergreen Oil of Newark, Calif. (12). The waste oil tank was triple-rinsed, and the rinsate and wastewater were hauled off site and disposed of by Falcon Energy of Stockton, Calif. Falcon Energy was also responsible for the disposal of the waste oil tank. (17) Following the tank excavations, two soil samples were collected from beneath each end of the former waste oil tank. Samples were analyzed for cadmium, chromium, lead, zinc, and polychlorinated biphenyls (PCBs). Analyses revealed only the presence of lead up to 25 mg/kg in soils beneath the tank (2). Approximately 9,075 cubic yards of soil and some concrete were removed from the excavation area and piled in the northeast corner of the trailer park. Some of the excavated soil was later used as backfill for the excavation pit. (18, 19) In March 1992, three monitoring wells were installed on site by Evax Techonolgies, Inc., consultants far Jack Vaughn and Darryl Christensen. The monitoring wells were installed for the purpose of evaluating if groundwater in the shallow aquifer beneath the site had been impacted by gasoline hydrocarbon products. Groundwater samples were collected on March 19, 1992. Groundwater samples from all the wells were analyzed for total petroleum hydrocarbons, benzene, toluene,ethylbenzene, and total xylenes. In addition, groundwater samples from two of the wells were analyzed for total lead. Lead was detected at 0.16 parts per million (ppm) in a monitoring well approximately 200 feet north of the former waste oil tank. A groundwater sample collected from the monitoring well approximately 30 feet northeast of the former waste oil tank did not reveal the presence of lead. Groundwater flow in the vicinity of the site is to the north- northwest. (3) 2.4 Regulatory Involvement 2.4.1 U.S. Environmental Protection Agency (EPA). The Cox& Cox site is not listed in the Resource Conservation and Recovery Information System (RCRIS), Region IX database as of June 8, 1993. 5 '0 �r "d �h PA Cox Cox-BB • 9193 r 5 Pointed on 5096 recyded paper. I'