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`j FARR ASSOCIATES <br /> Four single-wall steel underground storage tanks, designated Tanks #1 through #4, were <br /> located on the site (Figure 2). Tanks #1 and #2 were 10,000-gallon fuel tanks that reportedly <br /> F11 contained gasoline (PHS/EHD, 1995). Tank #3 was a 500-gallon tank, which contained both <br /> fuel oil and gasoline prior to its reported decommissioning in late 1940's (WHF, 1990). <br /> Tank #4 was a 250-gallon waste oil tank for used motor and compressor oils (WHF, 1990). In <br /> September of 1989, all of the tanks and associated piping were removed from the site by <br /> i SEMCO under permit and direction of the San Joaquin County Environmental Health <br /> Division. <br /> Analyses of the sample collected beneath the northern portion of the product line of Tanks #1 <br /> and #2 detected 78 mg/kg diesel. Soil samples collected from beneath Tanks #1 and #2 were <br /> L. non-detect. The soil beneath Tanks #1 and #2 and its product lines were'resampled in March <br /> 1990 in response to a request from San Joaquin County:Health Department. Total petroleum <br /> + hydrocarbons in the gasoline range (TPH-g), TPH in.the diesel range (TPH-d),'and the <br /> aromatics benzene, toluene, ethylbenzene, and xylenes (BTEX) were not detected. The depth <br /> from which these samples were collected appears to be approximately 14 feet bgs (PHS/EHD, ' <br /> j 1995). <br /> f Y <br /> f - f <br /> In January of 1990, an estimated°500 to 600 cubic yards of petroleum-affected soil were <br /> excavated from the former Tank #3 area by WHF Environmental Consultants (WHF). The <br /> r <br /> excavated soils were transported to the Union Ice facility located at 1320 West Weber Street, <br /> Stockton and bioremediated. Confirmation samples collected.from the floor at a depth of = <br /> approximately 25 feet below ground surface (bgs) and side walls of the Tank #3 excavation <br /> indicated residual contamination of TPH as motor oil (TPH-o) at,up to 285 mg/kg and <br /> ethylbenzene at 57 ,ug/kg (WHF, 1990). Soil samples collected during the installation of <br /> monitoring well MW-1, located approximately 30.feet northwest of the Tank #3 location, <br /> indicated toluene in the soils from 30 feet bgs down to the water table (55 feet bgs) at <br />. concentrations ranging from 16 to 130,ug/kg (WHF, 1993). <br /> R4182OA-525950-2 <br /> unionice./soilgas3.wpd 2 <br />