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E 1940's (WHF, 1990). Tank #4 was'a 250-gallon,waste oil'tank for use&motor and <br /> compressor oils (WHF, 1990). In September of. 1989, all"of the tanks and associated <br /> `i piping were removed from the site by SEMCO under' permit and direction of the San. <br /> Joaquin County Environmental Health Division. <br /> 3 Analysesof the sample collected beneath the northern portion of the product line <br /> of Tanks #1 and #2 detected 78 mg/kg diesel. Soil samples collected from beneath <br /> 9 <br /> Tanks #1 and #2 were non-detect. The soil beneath'Tanks #1 and #2 and its product <br /> lines were resampled in March 1990 in response to a,frequest from San -Joaquin County <br /> s Health Department. Total petroleum hydrocarbons in the gasoline range (TPH-g), TPH <br /> in the diesel range (TPH-d), and the aromatics benzene, toluene, ethylbenzene, and <br /> xylenes (BTEX) were all not detected. The,-depth from which these.samples were <br /> collected appears to be approximately 14 feet bgs (PHS/EHD, 1995). <br /> In January of 1990, an estimated 500':.to 600 cubic yards of petroleum-affected soil <br /> were excavated from the former Tank #3 area by WHF Environmental Consultants <br /> (WHF). The excavated soils were transported to the Union Ice facility located at 1320 <br /> West Weber Street, Stockton and bioremediated. Confirmation samples collected from <br /> the floor at a depth of approximately 25.feet below ground surface (bgs) and side walls <br /> y i is <br /> of the Tank #3 excavation indicated.residual contamination of TPH as motor oil <br /> a,. <br /> (TPH-o) at up to 285 mg/kg and ethylbenzene at 57 gg/kg (WHF, 1990). Soil samples <br /> collected during the installation of monitoring well MW-1; located approximately 30 feet <br /> northwest of the Tank #3 location, indicated toluene°in.the soils from 30 feet bgs down <br /> to the water table (55 feet bgs) at concentrations ranging from 16 to 130 ug/kg (WHF, <br /> 1993). <br /> T <br /> In April of 1992, WHF Consultants excavated approximately 1,200 cubic yards of <br /> petroleum-affected soil from the former Tank #4 area.. The affected soils were <br /> transported to the Union Ice facility'on Weber Street and bioremediated. The <br /> Ai <br /> excavation extended to a depth of approximately 35 feet bgs and was terminated to,the <br /> R41820A-625960-2 <br /> soilvap2.pin 2 <br /> as <br />