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T <br /> P <br /> � FcbrU:tn' 19, 1991 <br /> 1".�alttation of Scsil MidCirouEscl 11':ttcr AGS 35032-3 <br /> �I (!nocai Station NO, 6981. Stockton, California <br /> 1 <br /> I.:Aploration (State LICCrr9p No. 512265) of Stockton, Cakiforniu. Soil boring li 1 was . .Soc <br /> to rc�;;slrnct tnottiux'ing ++c11 \111' l ++ithirt 10 feet of the underTrouIul storage tanks. Sail <br /> lxJring B-2 was tlrillcd near the nortlleast corner 01' the ptJittp islands to construct ntonironnd <br /> +�cll \111'-2 nour the inferred up:4radicrJt side o1' the underground gasoline-storage tanks arul <br /> near an area where petroleum 11+'dFOC;l[bons %vere detected in 111e soil. Soil boring 13-3 was <br /> imately?5 feet southeast of the underground gasoline-storage tanks to construct <br /> drilkecl:Jpprox <br /> s�asoline <br /> nwngitorirr +\,ell \111'-3 near the inlerrcd +dojut radiertl side of tho underground <br /> Itoratr;e tanks. Soil t)Ofing 11-4 was drillcrd near the 1101-11nvest corner of thte pump islands to <br /> onstrrrct nJonitoring ++ell \111 t near the ini'rrcci npgradie[tt aide of rite urulcrgrouncl <br /> ~ gasolinc-storage tanks. Soil borin�� 13-5 —as clrillccl to construct rttonitorinc; well \lit'-3 near <br /> the underground easalinc stor;tge tanks grid near arr area where petroleum hydrocarbons were <br /> detected in the soil. 'File locations of the five soil borings/rrtonitoring tivclis are shown ort <br /> Plate P-?. l'1re soil Uorings +�crc tcrrninated at a depth approximately fee[ below <br /> surface grade. Ground ++ater +raS encountered at appraxim;tte9t' S1 feet belo++ rite surface <br /> grade in each burin,. <br /> During drilling, the geologist collected coil samples (ram the five borings at approximately 5 <br /> foot intervals for laboratory analysis and itlentiGcation. Additionally, 5400t 101114 collhtttrous <br /> cores were used to obtain continuous loszs of sediments front three of the borings. During <br /> � sampling,a field photoionization detector(PID)was used to evaluate the hydrocarbon vapors <br /> present in selected soil samples• Table 1 lists the boring number• depth interval, and PID <br /> reacting. <br /> Soil samples were classified according to tite UrifsCd Soil Classification Sister,, Platc [3 in <br /> rials encountered are presented in the Logs of Boring, <br /> ;appendix B. Descriptions of the mate <br /> Plates B-? through B-16 in Appendix B. <br /> 5 <br /> App1109d Ge®SystemS __ <br />