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•� ' First Quarter,2003 Quarterly Groundwater Monitoring Report Canepa's Car Wash,Pacific Avenue,Stockton,CA Page 4 Table 3 Groundwater Laboratory Analytical Results (January 14 and 15, 2003) Constituent Benzene Toluene Ethyl Total MTBE Gasoline MCL 1 µg/L 150µg/1, BOeOnzene Xylenes TPH-G 13;4 / Oxygenates/Additives Analytical Method--1' 8020 8020 8020 8020 8015m 8260B 8260B Reporting Limits—+ 0 5 gg/L 0 5 gg/L 0 5 pg/L. 1 0 lig/L 005 05 0 5-13 0 Sample 1 D mg/L µgll- gg/L 1707-MW-1-1/15/2003 1,100 120 80 270 3 4 60 <5 0-130* 1707-MW-2-1115/2003 15,000 980 2,400 4,100 69 <50 <50-1,300* <5 0-130* 1707-MW-3-1/15/2003 0 5 <0 5 <0 5 <1 0 <0 05 350 190 (1,2-DCA) 1707-MW-4-1/15/2003 13 <0 5 0 5 <1 0 0 08 <05 <0 5-13 0 1707-MW-5-1/14/2003 <0 5 <0 5 <0 5 <1 0 <0 05 <0 5 <0 5-13 0 1707-MW-6-1114/2003 <0 5 <0 5 <0 5 <1 0 <0 05 <0 5 <0 5-13 0 1707-MW-7-1/14/2003 <0 5 <0 5 <0 5 <1 0 <0 05 <0 5 <0 5-13 0 1707-MW-8-1/14/2003 <0 5 <0 5 <0 5 <1 0 <0 05 <0 5 <0 5-13 0 1707-MW-9-1/14/2003 <0 5 <0 5 <0 5 <1 0 <0 05 <0 5 <0 5-13 0 1707-MW-10-1/1412003 <0 5 <05 <05 <1 0 <0 05 <0 5 <0 5-13 0 1707-MW-11-1/1512003 2 6 <0 5 0 8 <1 0 0 18 13 15(TBA) 1707-MW-12D-1/15/2003 0 5 <0 5 0 6 <1 0 0 057 <0 5 <0 5-13 0 1707-SV4-1/15/2003 82,000 74,000 9,800 24,000 710 530,000 <5,000-130,000- Units Analytical mg/L=milligrams per liter=parts per million(ppm) B,T,E,X=benzene,toluene,ethyl benzene,total xylenes pg/l.=micrograms per liter=parts per billion(ppb) TPH-G=total petroleum hydrocarbons quantified as gasoline Gasoline oxygenates/additives= methyl tertiary butyl ether(MTBE),ethanol, tertiary butanol (TBA), di-isopropyl ether (DIPE), ethyl tertiary butyl ether (ETBE), tertiary amyl methyl ether(TAME), 1,2-dichloroethane (1,2-DCA), 1,2-dibromoethanc(1,2-EDB) . = Elevated reporting levels are due to high concentration of non-target analytes requinng sample dilution v �.� CONDOR