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55 <br /> SSE <br /> mum <br /> 2. FIELD INVESTIGATIONS <br /> E 2.1 PRIOR INVESTIGATIONS <br /> i <br /> The site was closed after a product line failure in November <br /> 1985. The amount of fuel lost was uncertain. Groundwater <br /> Technology, Inc. (GTI) supervised the subsequent <br /> F line removal. GTI installed two monitoring wellstinkJanuaryand 1986 <br /> Y 6 <br /> and an additional well in December 1986 (Figure 4) . On the basis <br /> of the boring logs, the materials immediately underlying the site <br /> e consist predominantly of clays and sands, lesser with <br /> Y amounts.:af <br /> { silt, silty clay, and silty sand with increasing depth. <br /> Two more monitoring wells were installed by GTI in May 1987, and <br /> water samples were collected and analyzed from all five wells at <br /> that time. The results of those analyses are Presented in Table <br /> 2. Soil sampies. were also collected from the newly drilled <br /> I A borings/wells numbered 4 and:.5f and those results <br /> ` r presented in Table 2. are also <br /> Both the soil and water samples collected in monitoring wells 4 � <br /> and 5 contained effectively no hydrocarbons. The water samples <br /> Of MW3 and MW3 .;t2id show elevated levels:' 75 mg/I; and 8.38 mg/L <br /> I. <br /> . .. total volatile hydrocarbons (TVH) , <br /> respectively. <br /> i <br /> 2.2 SOIL VAPOR CONTAMINANT ASSESSMENT <br /> ,On 23-.and:.-2 4 Nov <br /> ember:`1987 _ <br /> , EA conducted an SVCA serve <br /> i <br /> Stockton site. : Deep : (a y at the <br /> pproximately' 20.feet) soil gas samples <br /> we�7e collected::fr <br /> om six locations on-site. (VI-t,S, <br /> {> <br /> Figure 4) , and <br /> monitoring well`:headspace sampleswere taken from the five <br /> c� v <br /> C" •- <br /> j <br /> fnai�itorzng we11s'. A follow-up investigation for the presence of <br /> shallow hydrocarbon Y bon levels was condu,',ted on 22 December 1987 <br /> r Shallow samples were collected from-`five Locations (V7-Vll,.' <br /> Figure 4) . <br /> ` EXXON9:84L <br /> 1 _ - 7 - __ <br />