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_ - <br /> SIM <br /> 1 <br /> W� <br /> 2. FIELD INVESTIGATIONS <br /> f <br /> 2.1 PRIOR INVESTIGATIONS <br /> s: <br /> The site was closed after a product line failure in November <br /> F " 1985. The amount of fuel lost was uncertain. Groundwnter <br /> Technology, Inc. (GTI) supervised the subsequent tank and product <br /> E line removal. GTI installed two monitoring wells in January 1986 <br /> f <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 /> consist predominantly of clays and sands, with lesser amounts of <br /> silt, silty.,clay, and silty sand with increasing depth. <br /> Two more monit orimg wells. were installed by GTI in May 1987, and ? <br /> water samples were collected and analyzed from all five wells at j <br /> that ti=ne. The resi;lts of those analyses are presented in Table } <br /> 2. Soil. samples were also collected from the newly drilled <br /> borings/wellsnumbered 4 and 5, and those results are also <br /> presented in 'Table 2. <br /> Both thesoil and water samples collected in monitoring wells 4 <br /> i <br /> and 5. contained effectively no hydrocarbons The water samples <br /> of M541 and M[r73 did show elevated levels: 2.75 mg/h and 8.38 mg/L <br /> f <br /> total volatile hydrocarbons (TVH) , respectively. <br /> Li <br /> 2.:2 SOIL ,VAPOR CONTAMINANT ASSESSMENT a <br /> On 23 and .24 November 1987, EA conducted an SVCA survey at the <br /> Stockton sit eep-.(approximately-20-feet) soil -gas--samples <br /> were collected from:'six locations on-site (V1-V6, Figure 4) , and,,, <br /> 5 <br /> *.onitoring .well hea.dspace samples were taken from the five <br /> monitoring wells. A follow-up investigation for the presence of <br /> F' l .;hallow hydrocarbon levels was conducted on 22 December 1987.. <br /> Shallow samples were collected from five locations (V7-V11, z <br /> � � L r <br /> Figure 4):. <br /> f : - - - - <br /> �EXXON9.;84L 7 <br /> mill <br /> I. es <br />