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^� �� ttssss� �� ia� � �■ ! ! !� ! ! ! ! ! <br /> Table 3 <br /> Historical Groundwater Analytical Results <br /> Former Unocal Station No 5098 <br /> 5400 and 5606 Pack Avenue <br /> Stockton,California <br /> PHT n-PB TOLUENE 1 2 4-TMB 1 3 5-TMB XYLENES Methanol Ethanol <br /> SAMPLE DTW TPHg BENZENE tti t3U7YL sec-BB 1,2-DCA EB IPB M4BE NA , , , , <br /> 10 (ftJ (ug/L) (U91L) (ug/L) (119-IL) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (Ug/L) (ug/L) (ug (Ug/L) (ug/L) (ug/L) (-a) <br /> MW 31 <br /> NOT SAMPLED DURING FOURTH QUARTER EVENT <br /> Mw-32 <br /> NOT SAMPLED DURING FOURTH QUARTER EVENT <br /> DELTA COLLEGE WELL <br /> 05/21/97 110 26 NA NA NA 31 NA <50 NA NA 092 NA NA 66 NA NA <br /> 06/24/98 <50 <10 <10 <10 <20 <10 <10 <20 <10 <10 <10 <10 <30 <30 NA NA <br /> 09/15/98 130 28 NA NA NA 44 NA ND NA NA 25 NA NA 8 NA NA <br /> <50 <1 0 <1 0 <1 0 <10 <1 0 <1 0 <2 0 <1 0 <1 0 <1 0 <1 0 <3 0 <2 0 NA NA <br /> 03/18/99 <50 <0 50 NA NA NA <050 NA NA NA NA <050 NA NA <0 50 NA NA <br /> 06/17/99 <50 173 NA NA NA 27 NA NA NA NA <1 0 <1 0 <3 0 33 NA NA <br /> 09/16/99 270 564 NA NA NA 938 NA NA NA NA 64 NA NA 15 NA NA <br /> 12/13/99 <50 <1 0 <1 0 <1 0 <1 0 <1 0 <1 0 <20 <1 0 <1 0 <1 0 <1 0 <1 0 <2 0 NA NA <br /> 06/15/00 138 84 <1 0 <1 0 <1 0 55 <1 0 <20 <1 0 <1 0 <1 0 <1 0 <1 0 56 NA NA <br /> VAPOR EXTRACTION WELLS <br /> VEw-2B <br /> 03/18/98 3780 81800 6040 <100 <100 <100 3020 149 <200 842 460 13800 2990 820 15290 NA NA <br /> 06/24/98 3599 65000 3670 <100 <100 <200 1840 <100 <200 447 134 13400 2450 633 15230 NA NA <br /> 09/16/98 3893 71200 2600 <100 <100 <100 2990 152 <200 598 359 7730 3250 819 15060 NA NA <br /> 12/22/98 3341 43700 2610 <100 <100 <100 1420 <100 <200 560 169 6060 2420 603 10870 NA NA <br /> 03/18/99 3118 31000 3040 <100 <100 <100 913 <100 <200 210 106 3080 1470 373 7230 NA NA <br /> 06/18/99 3432 25000 2070 <100 <100 <100 1860 108 <200 818 208 4640 2610 670 12830 NA NA <br /> Not accessible due to the presence of remediation equipment <br /> VEW-3 <br /> 03/18/98 3803 96000 3630 185 <100 <100 4190 146 <200 722 526 21700 3570 978 22390 NA NA <br /> 06/24/98 3590 132000 4260 784 <100 <200 6210 330 <200 997 1150 20600 8870 2650 33790 NA NA <br /> 09/16/98 3877 119000 1900 <100 <100 <100 4220 <100 <200 338 <100 25900 3840 1160 23570 NA NA <br /> 12/22/98 3352 87200 4330 <100 <100 <100 3830 <100 <200 902 319 16600 2900 751 20450 NA NA <br /> 03/18/99 31 22 150000 3540 <100 <100 <100 4330 193 <200 1230 712 14900 5250 1510 23840 NA NA <br /> 06/18/99 3410 46600 2240 <100 <100 <100 4340 <100 <200 1550 434 15200 3890 1000 24600 NA NA <br /> Not accessible due to the presence of remedi ation equipment <br /> I <br /> VEW4 <br /> 03/18/98 3800 22900 3050 <50 <50 <50 1220 65 <100 390 190 465 1230 420 2907 NA NA <br /> 06/24/98 3568 9200 1180 <10 <10 <50 173 13 <20 18 14 79 367 181 738 NA NA <br /> 06940 293 29 of 31 ENSR Corporation <br />