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1
<br /> Pilot Testing Report and Conceptual Corrective Action Plan July 15, 1994
<br /> Manna Pro, 4004 South EI Dorado, Stockton, CA 3
<br />' 10,000-gallon diesel fuel tanks, two 5,000-gallon diesel fuel tanks, and one 10,000-gallon gasoline
<br /> tank Sod samples were collected at a depth of 15 feet below grade, and were analyzed for total
<br />' petroleum hydrocarbons (TPH) as diesel fuel and gasoline, and/or benzene, toluene, ethylbenzene,
<br /> and total xylenes (BTEX) Concentrations of 1,500 milligrams per kilogram (mg/kg) of diesel fuel
<br />' and 170 mg/kg of gasoline were detected in the sample collected from one boring (B1) Results
<br /> from all other samples were below the analytical method detection limit Detailed results of that
<br />' investigation are described in the report entitled Phase 11 Environmental Property Assessment,
<br /> submitted by WHF on February 10, 1990
<br />' 2 1 2 Underground Storage Tank Removal, WHF, Environmental Consultants, Inc
<br /> In July 1990, the five USTs were removed by SEMCO, Inc of Modesto, California, under contract to
<br />' WHF Ten sod samples were collected from the excavation bottom during the removal of the
<br /> underground fuel tanks, one at each end of the five tank excavations These samples were analyzed
<br />' for TPH-as-gasoline (TPH-G) and TPH-as-diesel fuel (TPH-D), and BTEX A concentration of 900
<br /> mg/kg of diesel fuel was detected in one sample collected near one 10,000-gallon diesel fuel tank
<br /> A concentration of 3,000 mg/kg of diesel fuel was detected near the other 10,000-gallon diesel fuel
<br /> tank Both gasoline and diesel fuel were detected in the soil samples collected near the north and
<br /> south ends of the 5,000-gallon diesel fuel tank Gasoline and diesel fuel were also detected in one
<br />' sod sample collected near the west end of the 5,000-gallon diesel fuel tank referenced as Tank #5
<br /> The tank removal procedures and analytical results are presented in the Re-Excavation Work Plan,
<br /> prepared by WHF and submitted to San Joaquin County Public Health Service (SJCPHS) on July 24,
<br /> 1990
<br />' 2 1 3 Re-Excavation Work, WHF, Environmental Consultants, Inc
<br />' During July 1990, in response to the detection of petroleum hydrocarbons during the removal of the
<br /> USTs, WHF proposed to excavate sod in the former tank area to a depth of 20 feet The
<br /> Re-Excavation Work Plan was submitted to SJCPHS on July 24, 1990 (Revised September 12, 1990),
<br /> and was subsequently approved
<br />' 2 1 4 Slot Sampling of Excavation, ERM-West, Inc
<br /> Around October 1990, Manna Pro retained ERM-West, Inc (ERM-West) to replace WHF ERM-West
<br /> recommended that additional investigation be performed to determine the extent of sod
<br /> contamination before further excavation of impacted soil On October 11, 1990, ERM-West
<br /> 2819R034070
<br /> GROUNDWATER
<br />' TECHNOLOGY, INC
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