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1 i I Table 3 + ; Historical Groundwater Analytical Results Former Unocal Station No 5098 5400 and 5606 Pacific Avenue Stockton,California I SAMPLE DTW TPHg BENZENE n-BUTYL sec-BB 1,2-DCA EBI IPB MtBE NAPHT n-PB TOLUENE 1,2,4-TMB 1,3,5-TMB XYLENES Methanol Ethanol ID 1 u /L u /L u1L u1L i2 /L u /L u1L u /L) (u1L) (u1L) (u1L) (111L) (u1L) u1L u /L 05/06/03 3275 <50 <0 5 <0 5 <0 5 <0 5 <0 5I1 <0 5 <0 5 <1 0 <0 5 <0 5 <0 5 <0 5 <0 5 NA NA 08/03/03 3552 <50 <0 5 <0 5 <0 5, <0 5 <0 5 <0 5 <0 5 <1 0 <0 5 <0 5 <0 5 <0 5 <0 5 NA NA 12/18/03 35 61 <50 <0 5 <0 5 <0 5 <0 5 <0 51 <0 5 <0 5 <0 5 <0 5 <0 5 <0 5 <0 5 <1 0 NA NA 02/26/04 3457 <50 <0 50 <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 04/12/04 3440 <50 078 <0 50 <0 50 <0 50 <0 50 <0 s0 <0 50 <0 50 <0 5o <0 50 095 <0 50 22 -- -- DELTA COLLEGE WELL 05/21/97 110 26 NA NA f NAi 31 NA <5 0 NA NA 092 NA NA 66 NA NA 06/24/98 <50 <10 <10 <10 <20 ' <10 <10 <20 <10 <10 <10 <10 <30 <30 NA NA 09/15/98 130 28 NA NA NA` 44 NA ND NA NA 25 NA NA 8 NA NA 12/22/98 <50 <1 0 <1 0 <1 0 <1 6 <1 0,1 110 <2 0 <1 0 <1 0 <1 0 <1 0 <3 0 <2 0 NA NA 03/18/99 <50 <0 50 NA NA NA <0 50 NA NA NA NA <0 50 NA NA <0 50 NA NA 06/17/99 <50 173 NA NA NA 27 NA NA NA NA <1 0 <1 0 <3 0 33 NA NA 09/16/99 270 564 NA NA NA'� 938 NA NA NA NA 64 NA NA 15 NA NA 12/13/99 <50 <1 0 <1 0 <1 0 <1 0 <1 0� <1 0 <2 0 <1 0 <1 0 <1 0 <1 0 <1 0 <2 0 NA NA 06/15/00 138 84 <1 0 <1 Of <1 0 55 <1 0 <2 0 <1 0 <1 0 <1 0 <1 0 <1 0 56 NA NA VAPOR EXTRACTION WELLS 11 VEW-2B 03/18/98 3780 81800 6040 <100 <100, <100 1 3020 149 <200 842 460 13800 2990 820 15290 NA NA 06/24/98 3599 65000 3670 <100 <100, <200 1844 <100 <200 447 134 13400 2450 633 ' 15230 NA NA 09/16/98 3893 71200 2600 <100 <100 <106 2990 152 <200 598 359 7730 3250 819 15060 NA NA 12/22/98 3341 43700 2610 <100 <100, <100 1420 <100 <200 560 169 6060 2420 603 10870 NA NA 03/18/99 31 18 31000 3040 <100 <100 <100 913 <100 <200 210 106 3080 1470 373 7230 NA NA 06/18/99 3432 25000 2070 <100 <100` <100 1860 108 <200 818 208 4640 2610 670 12830 NA NA Not accessible due to the presence of remediation equipment { VEW-3 03/18/98 3803 96000 3630 185 <100 <1uu 4190 146 <200 722 526 21700 3570 978 22390 NA NA 06/24/98 3590 132000 4260 784 <100 <200 6210 330 <200 997 1150 20600 8870 2650 33790 NA NA 09/16/98 3877 119000 1900 <100 <100 <106 4220 <100 <200 338 <100 25900 3840, 1160 23570 NA NA 12/22/98 3352 87200 4330 <100 <100 <100 J 3830 <100 <200 902 319 16600 2900 751 20450 NA NA 03/18/99 31 22 150000 3540 <100 <100` <100 4330 193 <200 1230 712 14900 5250 1510 23840 NA NA 06/18/99 34 10 46600 2240 <100 <100` <106 4340 <100 <200 1550 434 15200 3890 1000 24600 NA NA Not accessible due to the presence of remediation equipment 1 VEWA 03/18/98 3800 22900 3050 <50 <50 <50, 1220 65 <100 390 190 465 1230 420 2907 NA NA 06/24/98 3568 9200 1180 <10, <10 . <50 1 173 13 <20 18 14 79 367 181 738 NA NA 09/16/98 3852 7110 315 <1 0 17 <1 0 150 348 <2 0 138 504 38 534 234 2727 NA NA 06940-29* 2 ENSporabon ® M so M M = 0 to