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KEI-J90-0611.R1 <br /> September 24 , 1990 <br /> Page 2 <br /> I FIELD ACTIVITIES <br /> I KEI ' s field work was conducted on June 18, 1990, when one 550 <br /> gallon waste oil tank was removed from the site. The tank, was <br /> made of steel and numerous holes as large as three-inches in <br /> diameter were observed in the tank. Mr. William Snavely of -the <br /> San Joaquin County Public Health Services was present during ,tank <br /> removal and subsequent soil sampling. <br /> One soil sample, labeled WO1, was collected from beneath , the <br /> waste oil tank at a depth of approximately 10 feet. After <br /> further excavation, an additional sample, labeled W01(14) , , was <br /> collected from the waste oil tank pit at a depth of approximately <br /> 14 feet. Ground water was initially encountered at a depth of <br /> about 14 . 5 feet, then rose to a depth of approximately. 13 feet. <br /> After minor lateral excavation, limited due to the proximity of <br />' the waste oil tank pit to the underground fuel storage tank pit, <br /> three soil samples were collected from the sidewalls (labeled <br /> SWA, SWB and SWC) of the excavation 6 to 12 inches above the <br /> observed water level. Samples were collected from bulk material <br /> excavated by backhoe. Samples were placed in clean, two-'inch <br /> diameter brass tubes, sealed with aluminum foil, plastic caps and <br /> f tape, and stored in a cooled ice chest for delivery to a cer- <br /> tified laboratory. Sample locations are as shown on the attached <br /> Site Plan. <br /> SUBSURFACE CONDITIONS <br /> The subsurface soils exposed in the excavations consisted <br /> primarily of silty clay to the maximum depth explored'-('14. 5 <br /> feet) . <br /> ANALYTICAL RESULTS <br /> All samples were analyzed by Sequoia Analytical Laboratory in <br /> Redwood City, California and were accompanied by properly <br /> executed Chain of Custody documentation. All soil samples :were <br /> analyzed for total extractable petroleum hydrocarbons (TEPH) <br /> using EPA method 3550 in conjunction with modified 8015, benzene, <br /> I toluene, xylenes and ethylbenzene (BTX&E) using EPA method 8020, <br /> halogenated volatile organics using EPA method 8010, polychlorin- <br /> ated biphenyls using EPA 8270, .and metals - cadmium, chromium, <br /> 3 lead and zinc. <br /> Analytical results of the soil samples, collected from the waste <br /> oil tank pit, indicate levels of TEPH ranging from 3 .7 ppm to 640 <br /> PPM- Analyses of sample WO1 by EPA method 8010 indicate the <br /> presence of four detectable constituents at concentrations <br />