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Canepa's Gar Wash <br /> 248 East Park Street,Stockton,California <br /> Fourth Quarter Groundwater Monitoring Report,October 2002 <br /> Page 3 of 5 <br /> • western extent of the site Detections of MTBE appeared first in monitor well MW-4, followed by MW-1, and <br /> most recently MW-7 It is possible that the low concentrations of MTBE represent background concentrations <br /> since they are at the up-gradient extent of the site <br /> Table 2—Groundwater Laboratory Analytical Results (October I7,2002) <br /> H T E X TPU-G Gasoline <br /> Oxygenates/Additives <br /> Analytical Method—). 8020 8020 8020 8020 8015M 82605 <br /> Reporting Units µg/L µg/L gg/L µg/L mglL µglL <br /> Sample 1 D <br /> 2038-MW1-10117/02 <0 5 <0 5 <0 5 <1 0 <0 05 2 6(MTBE) <br /> 2038-MW2-10/17/02 48 22 31 77 91 <5 0-< 130 <br /> 2038-MW3-10/17102 08 <0 5 <0 5 <1 0 025 11 (MTBE) <br /> 2038-MW4-10/17/02 <0 5 <0 5 <0 5 <1 0 0 66-s 5 3(MTBE) <br /> 2038-MW5-10117102 9,400 9,500 1,300 6,600 61 <50-< 1,300 <br /> 2038-MW6-10/17/02 <0 5 <0 5 <0 5 <1 0 <0 05 17(MTBE) <br /> 2038-MW7-10117/02 <0 5 <0 5 <0 S <1 0 0 055 3 3(MTBE) <br /> Units Analytical <br /> mg/L=milligrams per Mer=parts per million(ppm) B,T,E,X=benzene,toluene,ethyl benzene,total xylenes <br /> jig/l-=micrograms per liter parts per billion(ppb) TPIi-G=total petroleum hydrocarbons quantified as gasoline <br /> • Gasoline oxygenates/additives=methyl tertiary butyl ether(MTBE),ethanol, <br /> tertiary butanol,di-isopropyl ether(RIPE),ethyl tertiary butyl ether(ETBE), <br /> tertiary amyl methyl ether(TAME) <br /> FUTURE WORK <br /> The next quarterly groundwater monitoring event is scheduled for January 2003 Condor is preparing a Work <br /> Plan for Additional Soil car Groundwater Investigation by Cone Penetrometer Testing to further evaluate the <br /> vertical and horizontal extent of groundwater contamination at the site <br /> �ir/� <br /> CONDOR <br />