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TABLE 4 CUMULATIVE ANALYTICAL RESULTS - GROUNDWATER Stockton Metropolitan Airport, Former Fuel Farm OXYGENATES SAMPLE DATE TPH- ETHYL- LOCATION SAMPLED JET FUEL TPH-G BENZENE TOLUENE BENZENE XYLENES MTBE RIPE ETBE TAME TBA SB-3 01103/96 460 750 29 15 12 so 12 NA NA NA NA SB-4 01/04196 8,500 18,000 710 95 1,100 2,400 ND<500 NA NA NA NA MW-1 11/26/02 840 7,700 1,300 460 490 670 ND<5 ND<5 ND<5 ND<5 ND<50 03107/03 120 7,300 1,600 38 170 180 ND<5 ND<5 N0<5 ND<5 N0<50 06106103 ND<250 3,900 700 11 1 110 58 ND<5 ND<5 ND<5 ND<5 ND<50 09/15/03 140 6,600 1 2,100 77 130 29 ND<5 ND<5 ND<5 ND<5 ND<50 MW-2 11!26102 340 420 ND<0 5 ND<0 5 ND<0 5 ND<1 ND<0 5 ND<0 5 ND<0 5 ND<0 5 18 03/07103 ND<50 220 ND<0 5 ND<0 5 ND<0 5 ND<1 ND<0 5 ND<0 5 ND<0 5 ND<0 5 ND<5 06/06/03 ND<250 240 11 18 ND<0 5 ND<1 ND<0 5 ND<0 5 ND<D 5 ND<0 5 22 09115103 ND<50 110 1 55 10 i 05 ND<1 ND<0 5 ND<0 5 ND<0 5 ND<0 5 ND<5 I MW-3 11/26/02 490 1,400 ND<0 5 ND<0 5 ND<0 5 ND<1 ND<0 5 36 ND<0 5 ND<0 5 28 03107103 ND<50 1,700 16 ND<0 5 054 30 ND<0 5 39 ND<0 5 ND<0 5 ND<5 06/06103 ND<250 1,800 50 92 11 30 ND<0 5 37 ND<0 5 ND10 5 ND<5 09115/03 54 2,100 55 62 33 3 2 ND<0 5 56 ND<0 5 ND<0 5 44 NOTES All results are reported in micrograms per liter(ug/1) which translates to parts per billion(ppb) Total Petroleum Hydrocarbons(TPH)as-Jet Fuel TPH as-Gasoline(TPH-G)and benzene toluene ethylbenzene xylenes(BTEX)analyzed by EPA Method 802018015M or 8260B Oxygenates methyl-t-butyl ether(MTBE) di-isopropyl ether(DIPE) ethyl-t-butyl ether(ETBE) tert-amyl methyl ether(TAME)and tert butanol(TBA)analyzed by EPA Method 62608 MTBE analyses on SB 3 and SB-4 samples by EPA Method 8020 ND<5=Not Detected at reporting limit of 5 ppb NA =Not analyzed for specified compound