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iSti^:• <br /> S• <br /> T.L.I: <br /> I FIDI DA <br /> y � ROliND�ATATER <br /> aLUL-L` CH�3pLpGY, INc. 411571,wtChitaguiiySn,ar,Gis,eur�l.(\'S4ii?II{alSl <br /> July 23. 1991 <br /> ,lob No.020300167 <br /> i <br /> Mr.Clint Rogers <br /> Chevron U.S.A.Inc. <br /> P.O.Box 5004 <br /> San Ramon,CA 94583 <br /> Subject: Groundwater Monitoring Report <br /> Chevron Facility Na.9-0557 <br /> 139 South Center <br /> Stockton.California <br /> Dear Mr.Rogers: <br /> This letter report has been prepared tar Chevron U.S.A.,Inc. ((,Ihevron)and summarizes the Groundwater Technology,Inc.at the tabove- <br /> routine groundwater monitoring and sampling Pericrmed by <br /> referenced site. <br /> The tour monitoring v+ells at this Chevron facility were monitored on June of, 1991,tto determine depth <br /> hase <br /> to-groundwater(DT",hydraulic gradient,and to checic fa presence <br /> hydrocarbons. Table 1 pr the current and historical groundwater-monitoring data. Figure 1 shows a <br /> well locatThe calculated gradient is.002,and slopes <br /> ions and groundwater potentiometric-surface lines. <br /> to the southeast. ; <br /> After measuring the DTW,the four monitoring wells were purged and sampled. All of the groundwater <br /> presence of benzene,toluene, ethylbertzene and xylenes(BTBX) and total <br /> samples were analyzed for the p wells <br /> peiroleum hydrocarbons(f Phi)-as-gasoline. Also,the watcoliforrer neThe collected <br /> resultsindicated that <br /> r' <br /> MW-1 and MW-2 were analyzed for the presence of eta its per billion(ppb)in <br /> the benzene concentrations were below the method detection limit M 1 and <br /> p b and <br /> P,'iJV-3 and MW-4,but were detected in the samples collected from Ma oiine utas detected npMW-t at <br /> 140 ppb, respectively. The analytical results indicated d<P 0 ppb in MW-4 The analytical results for <br /> 1,30o ppb.MW-2 at 1,800 Ppb.and MW-3 at 130 pp <br /> two samples analyzed for the presence of fecal coliform were below the method detection limit- <br /> the <br /> Copies of the analytical reports are attached. <br /> plficrs lhrowhnul 1h¢11.5.,casada and Orerscas <br />