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z <br /> y< <br /> .... ....... <br /> ori <br /> Feblu"m 19, 1991 <br /> tk;v.tl ,alio 11 of Soil ansl (irOL111d Wtiter A(;S 3SO32-3 <br /> Unocal StMion No, 0981, Stockton, C'alifornla <br /> fst Tile sediments belleath thesite 'erleralty consist of silt with 1/3- to 7-Foot thick <br /> irreguLliiy slistrihuie;l lacers of clay, saildv silty, sand. and gravel. Several of <br /> tIle,;toll layers appear to lie laterally Colltinl1OL15 across the site. A layer of sill <br /> t <br /> and clay lappro%inlatcly i3 meet beIc)\v surface grade) appears to eats lid <br /> i laterally across the site belteath tile first citcounlcrcd ground tti'atcr. <br /> u <br /> The groundwater ivadient is towards the east-northeast. Because gasoline <br /> ! hvilrocarhons %\cl-C detected in lite soil and L'.l'011ild water near the 1101-theast <br /> corner of IIIc site, g,asuline hy'drocarhons ma? have affected soil and grauttd <br /> Stater neirihc;+,l t IIW Iitc. i <br /> ]X,{},\i M EN DATIONS <br /> i d the {lre�ious work. Nve reconln?eild the folloltiillg <br /> [ivi ed on tllc results ()F this :111 : <br /> i <br /> o "lh:u a +t+.irk plan Lac prepared describing the scope of tt'ork, lu-occcltires, and <br /> iue[hods for additional stork. "Chat the +work plait be submitted to the San <br /> • • Joaduiu (°aunty i'l:bhc 1-lealttl Services to obtain rile appropriate perillits. <br /> o I hat 111ree boring; 6e drilled to delineate, the lateral eNtettt of gasoline <br /> llydrocarborls to the soil beireath the site. `bile proposed borings wiil be drilled <br /> north of boring 13-4. 13-2. tide) cast of B-S, as shotvtl on Plate P-?. <br /> o That vapor-extraction wells be installed in the borings and a test of the tt ells <br /> be perforil?ecl. <br /> k ' Llh1[TialONS <br /> This report was prepared it, accordance with generally accepted standards of environmental <br /> geological practice in California at the time this investigation was performed. This <br /> investigation teas conducted solely for the purpose of evaluating environmental conditions of <br /> the soil and ground water xvitlt respe,_t to selected gasoline hydrocarbons at the site. No soil <br />