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M <br /> From 1958 to 1982, hazardous substances at the service station on site included cleaning solvents <br /> stored in the garage area, and gasoline and waste oil maintained in underground storage tanks. The <br /> disposition of the onsite wastes and the type of cleaning solvents used are not known. From 1982 <br /> to 1984, under the ownership of Jack Vaughn and Darryl Christensen, the only onsite activity at <br /> the service station was pumping gasoline. However,the underground waste oil tank continued to <br /> be utilized as a repository for waste oil that was being generated off site at a neighboring business. <br /> The current business tenant, Mr. Ed's Mufflers and Brakes, uses Safety Clean for the cleaning of <br /> equipment, and stores two 55-gallon drums of waste oil and used oil filters on site. These drums <br /> are removed and disposed of approximately every 3 months by PRC Refinery Service of <br /> Patterson, Calif. <br /> In 1979, approximately 1,400 gallons of gasoline leaked into soil and groundwater from an <br /> underground storage tank on site. The leaky underground storage tank was removed in 1979 and <br /> replaced with another tank. Four fuel tanks, ranging in capacity from 4,000 gallons to <br /> 8,000 gallons, and a 500-gallon waste oil tank were excavated from the site in January 1990. The <br /> San Joaquin County Public Health Services department knew that the fuel tanks contained both <br /> regular leaded and unleaded gasoline. <br /> Two soil samples were collected from the pit of the former waste oil tank following excavation. <br /> Analyses indicated the presence of up to 25 milligrams per kilogram of lead in the soils beneath <br /> the former tank. In addition, groundwater samples collected from two onsite monitoring wells in <br /> March 1992 revealed the presence of lead up to 0.16 milligrams per liter in one well,but not in the <br /> other. �3 <br /> Under the direction of the San Joaquin County, Public Health Services, Environmental Health <br /> Division (EHD), soil investigation and groundwater sampling activities were performed by <br /> consultants for Jack Vaughn and Darryl Christensen from 1990 to 1992. The EHD provided <br /> technical oversight for tank removal and soil investigation operations and continues to regulate the <br /> site. r <br /> Groundwater beneath the site occurs at approximately 8 feet below ground surface. Geologic <br /> materials in the unsaturated zone beneath the site consist of sands and clays. Ten municipal <br /> drinking water wells are within 4 miles of the site. These wells serve approximately 40,507 people <br /> with blended drinking water. The nearest drinking water well is within 0.5 mile of the site. <br /> Surface water runoff from the site flows into the city's storm drain system and ultimately <br /> discharges into the Sugar Cut Slough. The Sugar Cut Slough is more than 2 miles from the site. <br /> ,u <br /> An unknown quantity of soil and concrete removed from the underground storage tank area was <br /> deposited in the northeast corner of the trailer park. Forty-two residents and employees are on site. <br /> Tracy Joint Union High School is within 200 feet of the site and is attended by approximately <br /> 1,750 students, but access to the site is restricted by fencing. The resident population within <br /> 2 miles of the site is 1,463 people. There are no daycare centers on or within 200 feet of the site. <br /> The ground surface in the southern portion of the site is paved, while the ground surface in the <br /> northern portion of the site is gravelled. <br /> Cy, � <br /> PA cox aCox-BB•9/93 9 PnWad an sox r cydbd pWw <br />