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i T 2 Summary of Analytic esults -Groundwater USA Gasoline Station #110 2132 East Mariposa Road Stockton, CA (Page 3 of 3) Concentration in pg/L (ppb) Date Well ID Benzene Toluene Ethyl- Total TPHg TBA MTBE DIPE ETRE TAME 1,2-DCA EDB Benzene Xylenes 11/14/02 MW-1 <0 5 <0 5 <0 5 <1 0 1,300 <20 61 <2 0 <2 0 <2 0 <2 0 <2 0 02/25/03 MW-1 <0 5 07 06 <1 0 980 120 410 <2 0 <2 0 <2 0 <2 0 <2 0 05/28/03 MW-1 24 1 1 07 <1 0 880 62 300 <2 0 <2 0 <2 0 <2 0 <2 0 08/21/03 MW-1 21 19 32 39 1,700 93 2,400 <2 0 <2 0 46 <2 0 <2 0 11/25/03 MW-1 14 09 12 19 2,100 <200 3,100 <20 <20 <20 <20 <20 02/05/04 MW-1 27 1 1 09 77 1,100 <200 1,200 <20 <20 <20 <20 <20 05/18/04 MW-1 92 09 1 1 1 9 630 <20 450 <2 0 <2 0 <2 0 <2 0 <2 0 08/11/04 MW-1 <0 5 <0 5 <0 5 <1 0 510 <20 490 <2 0 <2 0 <2 0 <2 0 <2 0 11/14/02 MW-2 <0 5 <0 5 <0 5 <1 0 180 <20 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 02/25/03 MW-2 <0 5 <0 5 <0 5 <1 0 170 <20 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 05/28/03 MW-2 <0 5 <0 5 <05 <1 0 160 <20 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 08/21/03 MW-2 1 7 <0 5 <0 5 <1 0 290 <20 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 11/25/03 MW-2 31 <0 5 <0 5 <1 0 420 <20 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 02/05/04 MW-2 <0 5 <0 5 <0 5 <1 0 160 <20 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 05/18/04 MW-2 <0 5 <0 5 <0 5 <1 0 <50 <20 <2 0 <2 0 <2 0 <2 0 <2 0 <2 0 08/11/04 MW-2 <0 5 <0 5 <0 5 <1 0 <50 <5 0 <0 5 <0 5 <0 5 <0 5 <0 5 <0 5 NOTES pg/L(ppb)denotes micrograms per liter(parts per billion) TPI-Ig denotes Total Petroleum Hydrocarbons as Gasoline, analyzed by Modified EPA Method 8015B 18021 B TBA denotes t-Butanol by EPA Method 8260B MTBE denotes Methyl Tertiary Butyl Ether by EPA Method 8260B DIPE denotes DI-Isopropyl Ether by EPA Method 82606 ETBE denotes Ethyl-t-Butyl Ether by EPA Method 8260B TAME denotes t-Amyl Methyl Ether by EPA Method 8260B 1 2-13CA denotes 1,2-Dlchloroethane by EPA Method 8260B EDB denotes 1 2-Dlbromoethane by EPA Method 8260B s%enviroQ5912Y OM-rableslH2O