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Mg- <br /> WORK �..,��� <br /> r <br /> may" <br /> FORMt;lt C'II1 VMYN ss 9.1918 <br /> ,15 EANIA 1ARDING WAN' <br /> 1. IN`MODUC TION AND SCQ1'1 <br /> Cticvroj,. U.S.A.Ina.rclaincd f-.A 1.nginccring,Scirncr,and Technology,it>c.0"M to <br /> Install mcrnitrating vvrlls at fonmr Chevron SS 9.1011+,•15 Pao I larding Way,Stm:ltitm, <br /> Cil tomia, llowm 7 and I I Igerviunbcr 1989,12A suptrmigd the rdrillin;of si7 sail <br /> bearings that were:romplcfrd ax imnitur ne Kell%. 11i_►sell%wrrc initalle d by Slcrtrtim <br /> EAplotatittn In,:. Tlic nt-mulo of this ins°esti8ation IrAlcatc the neecd to install ailditiv=1 <br /> mnitoring wclls to determine die talent of ground-%itcr contamination acid to drill Wil <br /> borings dict%kilt tx rarttplMd with trluipt ent trj Esc uwJ mntually frit attivi:Wil venting, <br /> This%Kix t plan sumnuritcs htitfly tht mriults of the irttial s,ubsurfacr investiga[ion irAl <br /> nutlincs do%%(xk to be appcndcd to the oiriginal pcnWt to install monitaring wells that was <br /> issued to Chevron on 4 Nowmtxr 1988. <br /> EA was oti8irtally retained by Chevron to conduct a soil wporco ntaminant sur%vy <br /> (SVCA)on the site. 'Ilse SVCA was completed 18 Novcnrtacr 1987 %hca the service <br /> irarian was,till dispensing-!xsoline. The soviet itatIon formerly located at this address <br /> was dcmolL%1xd.akin the undcrground tanks were pulled on 2•1 Nbruary 1988. Pcs:oleum <br /> hyd waftn eantarr6na:ion*-as idcndrttcd visually in the sails bmrath the tanks and <br /> confirmed chemically by analyv.s of sails stockpiled for aeration during c=va ion. Soils <br /> w=excavated from the tank pit to a depth of approacinutcly 20 fete,a depth that could he <br /> functionally rc tc.htd by 11M txtavatian equtpttstrst+ <br /> 'tire Current s<sbsuface im -cidgations nt this tits have tarn rnom completely mview,cd in a <br /> problem agscsrtr rit repast that Inas been prcpxvd for Chevron U.S.A.Inc.to be <br /> fans-rdcd to San Joaquin County Environmental lfeatth AM the Ccmual Valley Region of <br /> the Regional Nater Quality Control DOW. <br /> 2. THE CURRENTSUBSURFACE INVESTIGATION <br /> The exca+.-m;on was backfilled In early. ovember 1988 to mm s-c any poton.- l hazard,red <br /> six rn mimring Mils Were installed on the site(higurt 1). The soil borings wtrr,drilled to <br /> depths betw°ectt 41 wW 50 felt w4h an Ackcr r11wy drill using 10 incl:outside-ds'mmict, <br /> — ------- ------...------Isui4ow.41lem auzcr-u_tdsr Ct-Vtr=t Sm urs agliad"Lv-..(C37.li se number_ — <br /> 5 12268). water was f int rrcmt d In the borings bctw,rcn 36 anti 43 fent..Ground <br />