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! f 4 tl <br /> N <br /> I <br /> February 19. 1991 <br /> Evaluation of SO11 and (Jrc;urtd \Pater ;SGS 38032-3 ! <br /> Unocal Slcction L".,o. 0981, Stockton, California <br /> slight westward slope. Based on an extrapolation of a geological Wrap prepared by \larchancl <br /> and Atwater (1979), sedintertts beneatil tite site consist of alluvial deposits of the Modesto <br /> 1:0rrtlatiort, which were dcpmnc;l by the \]akclume [liver, and glacial outwash. <br /> PREVIOUS WORK <br /> Previous work is described M Apl)lied GeoSYstents Work Plan No. 38032-31V (July 7, 1989). <br /> Mlle locations where soil ':ttnples acre collected are shown on rile Sample l_oca[iatt \lap, <br /> Plate 1'-3. The results srf f:shor:ttory .ru:tivses of soil samples collected from sample locations <br /> aim 1 throuLh 18 arc shctwtt ern'Ihlrics A I.:%2. and :13 in Appendix A. The soil samples collected <br /> at 13 feet below grade. from 10,11;0115 shown on Plate A-3 (Appendix A) as location numbers <br /> 10, 11. 12, lb, 17, 18, represent tlo <br /> he samples collected below ,Ile ends of the t!lree previous <br /> Ir;. underground gasoline tanks. <br /> During kIav 1988, Applied GeoStistents monitored the excavation of soil and pipelines by <br /> Bassett Construction of Sacramento. CalifOrnia, collected soil samples for laboratory anal}'sis. <br /> and monitored the excavation of .oil and pipelines by Bassett Construction of Sacramento, <br /> California. During June 1988, Applied GeoSvstems monitored tile removal of underground <br /> gasoline tanks, excavat:011 of soil, and installation of two new underground gasoline [auks and <br /> collected soil samples. Results of the field workant' laboratnry analysis indicated gasoline <br /> hydrocarbons were present in the soil near the center and northeast corner of the tank cuvity <br /> and near the northeast corner of tite pttrnp islands (Applied GeoSvstenls, July 3, 1988). <br /> At the request of Unocal, Applied GeoSvstertts performed ,isoil-vaporsurvey at the site <br /> (Applied GeoSvstenls, January 12, 1989). '1'lte location where the soil-vapor samples were <br /> collected is shown on Plate A-3, and lite results of the survev are shown on Table A4 in <br /> 3 <br />