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TABLE 2 CUMULATIVE ANALYTICAL RESULTS-GROUNDWATER San Joaquin County Motor Pool, 1810 East Hazelton Avenue, Stockton, California SAMPLE OXYGENATES DATE ETHYL- LOCATION SAMPLE€] TPH-D TPH-G BENZENE TOLUENE BENZENE XYLENES MTBE DIPE ETBE TAME T&4 1,2-DG MW-4 12/19/03 NA ND<50 ND<0 5 ND<O 5 ND<O 5 ND<1 05 ND<O 5 ND<O 5 ND<O 5 24 ND<0 5 03!24104 NA ND<50 1 1 ND<05 ND<O5 ND-0 05 ND<05 ND<05 ND<O 5 21 ND<O5 06/09/04 NA ND<50 1 1 ND<0 5 ND<O 5 ND<1 0 ND<O 5 ND<0 5 ND<O 5 ND<5 ND<0 5 08/23104 NA ND<50 ND<O 5 ND<O 5 ND<O 5 ND<1 1 1 ND<O 5 ND<0 5 ND<O 5 ND<5 ND<O 5 i 12/29/04 NA ND<50 ND<O 5 ND<O 5 ND<O 5 ND<1 15 1 ND<0 5 ND<O 5 ND<O 5 15 ND<0 5 MW-5 12/19/03 NA ND<W ND<0 5 ND<O 5 ND<O 5 ND<1 ND<5 N0<5 ND<5 ND<5 ND<50 ND<5 03/24/04 NA ND<50 ND<0 5 ND<O 5 ND<0 5 ND<1 ND<O 5 ND<O 5 ND<0 5 ND<0 5 ND<5 ND<0 5 06/09/04 NA ND<50 ND<0 5 ND<O 5 ND<0 5 ND-41 ND<O 5 ND<O 5 ND<0 5 ND<0 5 ND<5 ND<O 5 08/23/04 NA ND<50 ND<0 5 ND<0 5 ND<O 5 ND<1 ND<O 5 ND<O 5 ND<O 5 ND<0 5 12 ND<O 5 12/29/04 NA ND<50 ND<O 5 ND<O 5 N0<0 5 NO<) ND<O 5 ND<0 5 ND<O 5 ND<O 5 ND<5 j ND<O 5 MW-6 12119/03 NA 7,800 2,100 ND<50 ND<50 820 ND<5 ND<5 ND<5 ND<5 ND<50 1%113<5 03/24/04 NA 9,300 1,600 ND<20 ND<20 540 ND<0 5 ND<O 5 ND<0 5 ND<D 5 ND<5 ND<0 5 06109/04 NA 5,600 630 ND<20 ND<20 61 ND<O 5 ND<O 5 ND<O 5 ND<O 5 ND<5 ND<O 5 08/23/04 NA 3,400 180 N000 ND<10 29 ND<5 ND<5 ND<5 1%113<5 ND<50 ND<5 12/29/04 J, NA $800 40 NO-10 ND<10 ND<20 ND40 5 ND<0 5 ND<O 5 ND<O 5 ND<5 ND<O 5 CITY WELL 12/28/01 ND<50 ND<O 5 ND<0 5 LND<0 5 1 ND<0 5 ND<0 5 NDc0 5 ND<O 5 ND<0 5 ND<5 ND<0 5 NOTES All results are reported in micrograms per liter(ugA)which translates to parts per billion{ppb) Total Petroleum Hydrocarbons as Diesel(TPH-D)analyzed by EPA Method 8015M Total Petroleum Hydrocarbons as Gasoline(TPH-G) benzene toluene ethytbenzene xylenes by EPA Method 8260B or 8020/8015M Oxygenates Methyl-t-butyl ether(MTBE) DWsopropyl ether(DIPE) Ethyl-t-butyl ether(ETBE) Tart-amyl mettryA ether(TAME)and Tart-Butanol(TBA)by EPA 82608 1 2-Dichloroethane(1 2-DCA)analyzed by EPA Method 82606 ND<O 5-Not Detected at reporting limit of 0 5 ppb NA a Not analyzed for specified compound 2of2