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TAPE 4 Analytical Results of Ground Water Samples - 14 May 2002 PACIFIC CAR WASH 4405 Pacific Avenue, Stockton, Callfomia MW-1 MW-2 MW-3 MW-4 MW-5 MW-6 MW-7 MW-8 MW-9 IMW-IOAIMW-10B i 48 to 53 25 to 45 29'/,to 49%. 30 to 50 25 to 45 25 to 45 20 to 4Q 2Q to 40 20 to 40 23 to 43 50 to 55 TPH-g 40,000 100,000 31,000 ND<50 ND<50 100,000 380 ND<50 260 480 ND<50 Benzene 6,700 270 740 ND<0 5 ND<0 5 910 1.7 ND<0 5 0.74 1.1 ND<0 5 Toluene EPA 610 970 230 ND<0 5 ND<0 5 3,500 055 ND<0 5 ND<0 5 ND<0 5 ND<0 5 thylbenzene 015M/8020 510 2900 1,500 ND<0 5 ND<0 5 3,000 ND<0 5 ND<0 5 ND<0 5 ND<0 5 ND<0 5 Xylene 2,400 16,000 3,700 ND<0 5 ND<0 5 20,000 ND<0 5 ND<0 5 ND<0 5 ND<0 5 ND<0 5 MTBE 340 ND<125 ND<50 ND<0 5 ND<0 5 2,900 120 12 68 380 26 MTBE 280 26 8.9 ND<0 5 ND<Q 5 1,800 110 1.1 69 370 ND<Q 5 DIPE 8 ND<5 ND<2 5 ND<0 5 ND<0 5 ND<50 ND<2 5 ND<0 5 ND<0 5 ND<5 ND<0 5 TAME ND<5 ND<5 ND<2 5 ND<0 5 ND<0 5 ND<50 ND<2 5 ND<0 5 ND<0 5 ND<5 ND<0 5 ETRE EPA ND<5 ND<5 ND<2 5 ND<0 5 ND<0 5 ND<50 ND<2 5 ND<0 5 ND<0 5 ND<5 ND<0 5 8260M TBA ND<50 ND<50 ND<25 52 ND<5 ND<500 ND<25 ND<5 51 ND<50 ND<5 EDB ND<5 ND<5 ND<2 5 ND<0 5 ND<0 5 ND<50 ND<2 5 ND<0 5 ND<0 5 ND<5 ND<0 5 1,2-DCA 140 ND<5 ND<2 5 ND<0 5 ND<Q 5 ND<50 ND<2 5 ND<0 5 1 0.56 ND<5 ND<0 5 Notes All samples reported in micrograms per liter(pe),TPH-g total petroleum hydrocarbons quantified as gasoline MTBE methyl tertiary butyl ether,D1PE di-isopropyl ether,TAME tert-amyl methyl ether,ETBE ethyl tert-butyl ether,TBA tent-butanol 1,2-DCA 1,2-dichloroethane,EDB ethylene dibromide ND not detected,NA not analyzed < indicates constituents were not detected at concentration greater than the reporting limit shown i unmodified or weakly modified gasoline is significant Advanced GeoEnvironmental,Inc I