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Table 1 Groundwater Analytical Results Former Unocal Station No 5098 5400 and 5606 Pacific Avenue Stockton,California Sample IQ Unit OTW TPH9 BENZENE n-BUTYL sec-BB 1,2-OCA EB IPB MTBE NAPHT N-PB TOLUENE 1,2,4-TMB 1,3,5-TMB XYLENES METHANOL ETHANOL 0 J (a /L) (MI-LJ (u /L) (u /L) (u L) (U91L) (u/L) (-U-/L) (u /L) (u L) (U91L) (u 1L) (u 1L) (u/L) (u L (u IL MW-1 12/18/03 B 3525 4 400 1 860 58 <5 0 <50 86 10 <5 0 46 26 17 <5 0 78 <10 NA NA 02/27/04 B 3413 3,300 520 66 <2 5 <2 5 530 79 <2 5 270 200 1 1 0 30 <2 5 350 NA NA 04/12/04 B 3407 2 900 620 38 070 <0 50 58 50 <0 50 16 12 13 60 18 28 - -- 07l12104 B 3666 100' 19 <0 50 <0 50 086 12 <0 50 <0 50 <0 50 <0 50 054 <0 50 <0 50 10 -- -- 10/18/04 B 3841 3301 67 <0 50 <0 50 <0 50 66 075 <0 50 32 17 1 2 <0 50 <0 50 43 - - 01110l05 B 3684 1301 14 <0 50 <0 50 <0 50 1 1 <0 50 <0 50 12 <0 50 <0 50 <0 50 <0 50 10 - MW-2 12/18/03 B 3535 28 0002 900 47 <12 <12 2,500 100 <12 590 270 350 1,900 410 7200 NA NA 02127/04 8 3427 31,000 1,300 59 <10 <10 1,700 75 <10 580 200 450 1,400 260 4,400 NA NA 04/12/04 B 3418 14,000 580 <10 <10 <10 630 22 <10 320 41 130 1500 340 3,300 -- -- 07/12/04 B 3670 7601 59 <0 50 <0 50 <0 50 50 28 <0 50 92 55 78 46 80 120 -- - 10/18/04 B 3848 2,8001 300 <10 <10 <10 170 14 <10 68 32 43 320 68 700 -- -- 01/10105 B 3688 13,000 1,000 <10 <10 <10 390 14 <10 95 44 130 1,400 260 2,300 -- -- 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 3340 31 000 3,500 28 <20 <20 1,100 44 <20 240 110 2000 780 170 3 700 NA NA 04/12104 B 3340 17 000 2,800 29 66 <0 50 930 39 <0 50 170 110 490 650 150 3,000 - - 07/12/04 B 3592 1,100' 19 1 7 076 <0 50 10 14 <0 50 24 38 81 57 1 4 21 -- -- 10/18/04 8 3783 23 000 4 000 <50 <50 <50 1,100 <50 <50 230 91 2 400 620 140 3,800 -- -- 01110105 B 3680 15,000 2,500 28 <10 <10 890 32 <10 74 110 1,200 630 130 2,800 -- -- MW-4 12/19/03 B 3544 7200 1 1,700 78 <5 0 <5 0 290 16 <5 0 50 38 120 210 31 540 NA NA 02/27/04 B 3430 5,100 900 <5 0 <5 0 <5 0 160 99 <5 0 23 20 36 120 14 300 NA NA 04/12104 B 3492 4,500 1,800 <0 50 14 <0 50 130 14 <0 50 17 30 12 40 26 42 -- - 07/12104 B 3675 100' 21 <0 50 <0 50 <0 50 20 <0 50 <0 50 <0 50 052 071 25 <0 50 33 -- -- 10/18104 6 3854 110' 39 <0 50 <0 50 <0 50 58 <0 50 <0 50 14 063 22 32 <0 50 93 -- - 01110105 B 3698 1,500 520 <10 <10 <10 32 <10 <10 10 <10 15 56 <10 75 --06940293 1 of 11 ENSR Corporat=on