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Summary of AnalytTlI esults -Groundwater USA Gasoline Station #110 2132 East Mariposa Road Stockton, CA (Page 3 of 3) Concentration to pg/L (ppb) Date 11 ID Benzene Toluene Ethyl- Total TPHg TBA MTBE DIPE ETBE 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 1 2 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 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 i 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!2$103 MW-2 <Q 5 <Q 5 <0 5 <1 D 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 3 1 <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 NOTES pglL(ppb)denotes micrograms per liter(parts per billion) TPHg denotes Total Petroleum Hydrocarbons as Gasoline analyzed by Modified EPA Method 8015B/8021 B TBA denotes t-Butanol by EPA Method 8260B MTBE denotes Methyl Tertiary Butyl lather by EPA Method 8260B DIPE denotes DI-Isopropyl Ether by EPA Method 8260E ETRE denotes Ethyl-t-Butyl Ether by EPA Method 82606 TAME denotes t-Amyl Methyl Ether by EPA Method 8260E 1 2-DCA denotes 1,2-Dlchloroethane by EPA Method 8260B EDB denotes 1 2-Dlbromoethane by EPA Method 8260B S\envlro\2591210003CrableslH20