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Canepa s Car Wash <br /> .f 6230 Pacific Avenue,Stockton,CA <br /> Third Quarter Groundwater Momtonng Report,July 2004 <br /> Page 4 of 6 <br /> Contaminant concentrations In the sample collected from MW-3 increased relative to the May 7, 2004 <br /> monitoring event, however, contaminant concentrations were less than the January 30, 2004 monitoring <br /> event (Figure 6, Attachment A) Contaminant concentrations in the sample collected from monitor wells <br /> MW-1, MW-2, MW-5, and soil vapor extraction well SV-4 are generally consistent with historic results <br /> Benzene and MTBE iso-concentration contour maps are included as Figures 4 and 5, respectively, <br /> Attachment A Laboratory certificates of analyses and chain of custody record are included in Attachment <br /> E <br /> Table 3 <br /> Groundwater Sample Laboratory Analytical Results (July 22 and 23, 2004) <br /> Constituent Benzene Toluene Ethyl Total TPH-G MTBE Other Gasoline <br /> Benzene Xylenes Oxygenates/Additives <br /> MCL I lig/L. 150µg/L 700 lig/l, 1,750µg/L 13 Ag/L. <br /> Analytical Methods 8260B 8260E 8260B 8260B 8015m 8260B 8260B <br /> Reporting Limits-4 0 5 pg/L 0 5µg/L 0 5}ig/L 1 0 pg/L 005 05 0 5 -20 <br /> Sample I D mg/L Ag/L gg/L <br /> 1707-MW I-7/23/04 4,400 150 110 170 2 1 210 < 1 0-<40 <br /> 1707-MW2-7/23/04 9,500 1,000 2,300 3,750 40 <1 0 < l 0-<40 <br /> < 10-<40 <br /> 1707-MW3-7/22/04 19 <1 0 <1 0 <20 <0 05 1,000 <br /> 110(1, 2-DCA)* <br /> . 1707-MW4-7/22/04 <0 5 <0 5 <0 5 <1 0 <0 05 <0 5 <0 5 -<20 <br /> 1707-MW5-7122/04 13 <0 5 <0 5 <1 0 <0 05 <0 5 <0 5 -<20 <br /> 1707-MW6-7/22/04 <05 <0 5 <0 5 <l 0 <0 05 <0 5 <0 5 -<20 <br /> 1707-MW7-7/22/04 <05 <0 5 <0 5 <1 0 <0 05 <0 5 <0 5 -<20 <br /> 1707-MW9-7/22/04 <0 5 <0 5 <0 5 <1 0 <0 05 <0 5 <0 5 -<20 <br /> 1707-MWIO-7/22/04 <05 <0 5 <0 5 <1 0 <0 05 <0 5 <0 5 -<20 <br /> 1707-MW 11-7/22/04 <0 5 <0 5 <0 5 <1 0 0 072 3 5 <05 -<20 <br /> 26 TSA <br /> 1707-MW 12D-7/23/04 <0 5 <0 5 <0 5 <1 0 <0 05 <0 5 <0 5 -<20 <br /> 1707-SVE4-7/22/04 78,000 70,000 4,800 23,000 260 410,000 <500-<20,000 <br /> Bold analytical data exceed California MCL(Maximum Contaminant Level) <br /> *=Review of EDF indicated that the positive laboratory analytical result for TAME in MW 3 should have been reported as 1 2-DCA <br /> Units Analytical <br /> mg/L=milligrams per liter=parts per million(ppm) B,T,E,X=benzene,toluene,ethyl benzene,total xylenes <br /> µg/L=micrograms per liter parts per billion(ppb) TPH-G=total petroleum hydrocarbons quantified as gasoline <br /> Gasoline oxygenates/additives= methyl tertiary-butyl ether(MTBE),ethanol, <br /> tertiary-butanol (TBA), di-isopropyl ether (RIPE) ethyl tertiary butyl ether <br /> (ETRE), tertiary-amyl methyl ether(TAME), 1,2-dichloroethane (1,2-DCA), <br /> I 2-dibromoethane(1,2 EDB) <br /> I <br /> 4 <br /> �d� CONDOR <br />