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TA*E 4 • Analytical Results of Ground Water Samples - 14 August 2002 PACIFIC CAR WASH 4405 Pacific Avenue, Stockton, Callforma MW-1 I MW-2 MW-3 MW-4 MW-5 MW-6 MW-7 MW-8 MW-9 MW-10A MW-10B 48 to 53 25 to 45 29'/2 to 49%. 30 to 50 25 to 45 1 25 to 45 20 to 40 20 to 40 20 to 40 23 to 43 50 to 55 TPH-g 42,000 98,000 67,000 ND<50 ND<50 94,000 480 ND<50 640 330 ND<50 Benzene 9,900 420 1,100 ND<0 5 ND<0 5 1,100 2.5 ND<0 5 27 ND<0 5 ND<0 5 Toluene EPA 720 1,900 1,400 ND<0 5 ND<0 5 3,100 ND<0 5 ND<0 5 1.5 ND<0 5 ND<0 5 thylbenzene 8015NV8020 630 3,200 2,800 ND<0 5 ND<0 5 2,700 ND<0 5 ND<0 5 14 ND<0 5 ND<0 5 Xylene 3,000 18,000 13,000 ND<0 5 ND<0 5 20,000 13 ND<0 5 44 ND<0 5 ND<0 5 MTBE 450 ND<100 ND<50 ND<0 5 ND<0 5 2,400 150 ND<0 5 15 700 81 MTBE 280 13 19 ND<0 5 ND<0 5 1,800 93 ND<0 5 12 490 62 DiPE 94 ND<5 ND<5 ND<0 5 ND<0 5 ND<50 ND<2 5 ND<0 5 ND<0 5 ND<5 ND<0 5 TAME 4.5 ND<5 ND<5 ND<0 5 ND<0 5 ND<50 ND<2 5 ND<0 5 069 24 ND<0 5 ETBE 8EPA ND<2 5 ND<5 ND<5 ND<0 5 ND<0 5 ND<50 ND<2 5 ND<0 5 ND<0 5 ND<5 ND<0 5 TBA ND<100 ND<200 ND<200 ND<20 ND<20 ND<200 ND<100 ND<20 ND<20 62 ND<20 EDB ND<2 5 ND<5 ND<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 1110 ND<5 ND<5 ND<0 5 ND<0 S ND<50 ND<2 5 ND<0 5 1 16 1 18 069 Notes All samples reported in micrograms per liter(µgA),TPH-g total petroleum hydrocarbons quantified as gasoline MTBE methyl tertiary butyl ether,DIPE di-isopropyl ether,TAME tert-amyl methyl ether,ETBE ethyl tert-butyl ether,TSA tertbutanol,1,2-DCA 1,2-dichloroethane,EDB ethylene dibromide NO not detected,NA not analyz(d < indicates constituents were not detected at concentration greater than the reporting limit shown i unmodified or weakly modified gasoline is significant I Advanced GeoEnvvonmental,Inc