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Fourth Quarter,2001 Quarterly Groundwater Monitoring Report <br /> Canepa's Car Wash,Pacific Avenue,Stockton,CA <br /> January 14,2002 <br /> Page-3- <br /> . historical laboratory analytical results (Table A, attached). Benzene and MTBE iso-concentration <br /> contours are shown in Figure 5 and Figure 6, respectively. Graphs showing benzene and MTBE <br /> concentrations in MW-1 and MW-2 relative to groundwater elevations are attached as Figures 7, 8, 9, and <br /> 10. The samples were analyzed by GeoAnalytical Laboratories, Inc. of Modesto, California. <br /> Table 1 <br /> Groundwater Elevation Data (October 25,2001) <br /> Well Casing Well Collar Depth to Groundwater <br /> Screen <br /> WELL Elevation Water Elevation <br /> Interval (feet) (feet) (feet) <br /> (feet-bgs) <br /> MW1 50-70 15.48 35.10 -19.62 <br /> MW2 50-70 15.29 34.87 -19.58 <br /> MW3 50-70 15.53 35.47 -19.94 <br /> MW4 50-70 15.83 35.59 -19.76 <br /> MW5 50-70 14.71 34.55 -19.84 <br /> MW6 45-65 14.89 34.19 -19.30 <br /> MW7 45-65 15.80 35.32 -19.52 <br /> MWS 45-65 15.31 35.27 -19.96 <br /> MW9 25-45 14.84 34.76 -19.92 <br /> MW 10 25-45 14.72 33.99 -19.27 <br /> MW11 25-45 15.12 34.61 -19.49 <br /> MW12d 100-110 1499 34.52 -19.53 <br /> • Table 2 <br /> Laboratory Analytical Results (October 25126,2001) <br /> Constituent: Benzene Toluene Ethyl Total TPI/-G MTBE <br /> MCL 1 ug/L 150µg/L 700µti Xylenes 13 gg/L <br /> Detection Limit: 0.5 0.5 0.5 1.0 0.05 0.5 <br /> Sample ID mg/ pg/L µg/L pVL mg/L pg/L <br /> 1707-MW1-10126/01 680 320 77 240 3.3 390 <br /> 1707-MW2-10/26/01 17,000 870 1,800 4,600 62 <50 <br /> 1707 MW3-10126/01 <0.3 <03 <0.3 <0.6 <0.05 100 <br /> 1707-MW4-10125101 <03 <03 <0.3 <0.6 <0.05 <1.0 <br /> 1707-MW5-10/25/01 <0.3 <0.3 <0.3 <0.6 <0.05 <1.0 <br /> 1707-MW6-10/25101 <0.3 <0.3 <0.3 <0.6 <0.05 <1.0 <br /> 1707-MW7-10/26/01 <0.3 <0.3 <0.3 <0.6 <0.05 <1.0 <br /> 1707-MW8-10/25/01 <0.3 <03 <0.3 <0.6 <0.05 <1.0 <br /> 1707-MW9-10/25/01 <0.3 <03 <0.3 <0.6 <0.05 <1.0 <br /> 1707-MW10-10125101 <0.3 <0.3 <0.3 <0.6 <0.05 <1.0 <br /> 1707-MW11-10125101 390 64 61 140 2.4 85 <br /> 1707-MW12d- <br /> 10125/01 170 240 72 430 2.4 <10 <br /> Unit Conversions: Analytical: <br /> ug/L:parts per billion(ppb) TPH-G=total petroleum hydrocarbons,quantified as gasoline. <br /> mg/L:parts per million(ppm) MTBE=methyl-tertiary butyl ether <br /> • <br /> C CONDOR <br />