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g - <br /> -w <br /> gasoline (TPH-G) up to 360 ppm. Ground water was encountered <br /> between 11 and 12 feet below grade (Kaprealian, 1988b) . <br /> In February <br /> fram9g2+testadditional <br /> atsoil <br /> depthspof85were <br /> and 1Qcollected <br /> below <br /> I1 the siteles detected <br /> grade using a backhoe. Analyses 3f600�ppm aand TFH-G of up to <br /> concentrations of TPH-D of up <br /> 170 ppm. Results of the investigative work revealed the <br /> i� presence of diesel-range contamination in the subsurface soil <br /> extending to a depth of 10 feet below grade and encompassing <br /> Ilytical <br /> an area of approximately est00 cubichat feet. soil ahydrocarbon <br /> data from test holes sugg <br /> contamination is limited to the northern portion of the site <br /> (Kaprealian, 1989) . <br /> in February 19charalcteriil zelin-situafornpotentialed Alton <br /> offsite <br /> Geoscience to were to be used <br /> disposal. The results of the soil profiling <br /> during soil excavation to segregate the soil for disposal at <br /> the appropriate offsite facilities, <br /> lch <br /> soil excavation was initiated. Ea-racte <br /> i Petro3sum+ Inc. Milpitas, <br /> Milpitas,m the ationr <br /> runder theCalifonia, wascsupervisiy <br /> on <br /> On Guly 9, 1990+ of <br /> Alton. ?zosc.ieMobil il to nrce. Approximately 5,080rcu is yardl0ofesoil <br /> Notal depth of approximately et <br /> wer4 excavated to a p disposed of at the Durham Road <br /> (depth of water tal and <br /> Waste Management facility. <br /> Landfill and the Liquid <br /> roximately 7,300 cubic yards of imported <br /> On 3uly 23, 1990, app <br /> clean fill were used for backfilling of the open excavation. <br /> osci <br /> On September 26, 1990, Alton Geall ofcwhichewere subsequeatly <br /> drilling of four soil borings, <br /> converted to ground water Monitoring Wells AW-1 through AST-�• <br /> The monitoring well locations are shown in Figure 2. <br /> Ground water samples collected from all moni'Loring wells were <br /> analyzed for TPH-G, TPH-D, BTEX, and organic lead. Ground <br /> water samples fromwere <br /> fecal Wells AWrm.anNone ofd AW-3 <br /> ere constituents <br /> - <br /> additionally analyzed <br /> constituents were detected above reported <br /> a3tewhich had <br /> TPH-G, anlimits <br /> in <br /> Well AW <br /> all samples except from Monitoring d hich The <br /> detectable concentrations of TPH-D, e from _ <br /> concentrations of belowdetected <br /> statenthe pri.marymaximum contaminant <br /> however, were all results are <br /> levels (MCL) for drinkAltanat1990 ando1991)y <br /> -presented in Table 1 <br /> 3 <br />