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YWI; W7 <br /> & <br /> P <br /> .G. <br /> I <br /> tq <br /> 1 < <br /> is <br /> i <br /> Rernv-ra!of Piping and Closure Sampling,August 1990 The piping that still remain <br /> E� ed from <br /> the original facilities was removed. Closure samples were collected by another contractor to <br /> Exxon. Analytical results are not available to EA and,therefore,are not reported with this quay_ <br /> ` terly summary. <br /> Groundwater Sampling 19 September 1990 Tile <br /> S eight t monrtoring wells were ganged, and,MW2, MW6, MW7, and MW8 (Figure 2}v�ere <br /> sampled. MW3, MW4 and MW5 were <br /> dry. Samples were submitted under chain Of c'!stody to Pace Laboratories, <br /> analyzed for TPH by DNS-modified EPA Method 8015 and for BTXE by EPA Method 8020.Were <br /> T:te analytical =sults are summarized in Table 2(the laboratory report is provided as Appendix <br /> Q. The results of analysis indicate that one of the water samples (MW6) contained concentra- <br /> tions of petroleum hydrocarbons greater than the method detection limits. K-VV6, which replaces <br /> MW3,is located in the for :er tank field and is surrounded on four sides b the paces <br /> Sam lin l Y other wells. Well <br /> Sampling rie.d forms are included as Appendix D. A cumulative history of analytical results of <br /> groundwater sampling since 1986 is provided in'fable 3. •: <br /> PLANNED ACTIVrYIES AS OF OCTOBER 1990 - <br /> Vapor Extract'J System A work plan has been filed with the San Joaquin-Environmental <br /> Health Department for the installation of a vapor extraction and'treatment system, this.work. <br /> will be cairied ont b EV <br /> Y A3C Technologies, Inca <br /> _( { The next roand of quarterly groundwater sampling to be completed.by l-A is planned for mid- <br /> �,_ December 1990. <br /> .. 4. DEFINITION OF PETROLEUM HYDROCARBONS IN THE SOIL t <br /> { Tank Closure Samples <br /> Soil samples were collect , <br /> { ed from the tank excavations at the ttme of the tank removal in Febru- <br /> s= ary''1986(S-1 to S-6,'Figure 3). Concentrations of TPH to 4,600 mg/kg <br /> 1 i ey i.n sail samples collected from the excavation. The reports of the earinvestigations were <br /> G <br /> by Groundwater Technologies, Tnc'.; indicated that the amount of completed <br /> A � its distribution was "localized" (GTI report to Exxon, March 1986).affected soil was "minor"and <br /> 1 SKY <br /> -......Soil. _.... _ <br /> E. <br /> Borings <br /> 1 ' Soil samples have been collected from several soil'borings that have been drilled, which have <br /> j y been subsequently completed as monitoring wells or have been aced specifically for soil sam- <br /> piing(SBS,SB6,SB7)(see Figure 1). ;The results of the <br /> a� Table I(for MW6-4VV8,drilled by EA),Table 4 analyses of these samples are shown in <br /> (for MW3-MW5,drilled by GTI)and Table 5 <br /> F is <br /> Ir z o42i7I050/nov/pct <br /> u 2 <br /> s <br />