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Table 4 Recent Groundwater Analytical Results Former Unocal Station No 5098 5400 and 5606 Pacific Avenue k Stockton, California { Sample ID Unit DTW TPHg BENZENE N-BUTYL sec-BB 1,2-DCA EB IPB MtBE NAPHT N-PB TOLUENE 1,2,4-TMB 1,3,5-TMB XYLENES METHANOL ETHANOL t) (491L) (U /L) (u /L) (u /L) (u /L) (u /L) (u /L) (u /L) (u /L) (u /L) (u /L) (u /L) (u /L) (u 1L) (u /L) (u /L E MW-1 12/18/03 B 35 25 4,4001 860 58 <5 0 <50 86 10 <50 46 26 17 <5 0 78 <10 NA NA E 02/27/04 B 3413 3,300 520 66 <2 5 <2 5 530 79 <2 5 270 200 110 30 <2 5 350 NA NA MW-2 12/18103 B 3535 28,000' 2,900 47 <12 <12 2,500 100 <12 590 270 350 1,900 410 7,200 NA NA 02/27/04 B 34 21 31,000 1,300 59 <10 <10 1,700 75 <10 580 200 450 1,400 260 4,400 NA NA MW-3 12/23/03 B 3510 32,000 7,000 <25 <25 <25 2,200 69 <25 <350 230 4300 1,400 330 8,300 NA NA 02/27/04 B 3346 31,000 3,500 28 <20 <20 1,100 44 <20 240 110 2,000 780 170 3,700 NA NA MWA 12/19/03 B 3544 7,200' 1,700 78 <5 0 <50 290 16 <5 0 50 38 120 210 31 540 NA NA E 02/27/04 B 3430 5,100 900 <5 0 <5 0 <50 160 99 <5 0 23 20 36 120 14 300 NA NA MW-5 M 12/19/03 B 3443 33,0001 7,000 <50 <50 <50 1,400 55 <50 320 140 3,200 920 210 5,300 NA NA 02/27/04 B 3454 <50 14 <0 50 <0 50 <0 50 051 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <1 0 NA NA MW-6 12/18/03 B 3591 1,600 610 31 16 <05 12 77 <0 5 35 19 16 051 081 56 NA NA 02/27/04 B 34 3i 3,400 200 12 22 <0 50 100 120 <0 50 540 300 170 <0 50 074 630 NA NA MW-7 12/19103 B 35 73 <50 11 <0 5 <0 5 <0 5 <0 5 <0 5 <0 5 16 053 099 <0 5 <0 5 <1 0 NA NA 02127/04 B 3464 <50 46 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <0 50 <1 0 NA NA f MW-8D 12/19/03 D 35 6a 420 74 065 <0 5 <0 5 15 18 <0 5 26 34 21 46 052 <1 0 NA NA 02127/04 D 34 53 400 61 <0 50 <0 50 <0 50 12 14 <0 50 077 22 22 33 <0 50 37 NA NA r E 06940-293 1 of 5 ENSR Corporation � I