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Table 3 <br /> Historical Groundwater Analytical Results <br /> Former Unocal Station No.5098 <br /> 5400 and 5606 Pacific Avenue <br /> Stockton,California <br /> SAMPLE 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 <br /> ID ° /L u /L u /L 1L v v /L a v2 u L u 2 u L u L (491L) u /L /L u L <br /> DELTA COLLEGE WELL <br /> 05/21/97 110 26 NA NA NA 3.1 NA <5.0 NA NA 0.92 NA NA 6.6 NA NA <br /> 06/24/98 <50 <10 <10 <10 <20 <10 00 <20 <10 <10 <10 <10 <30 <30 NA NA <br /> 09/15/98 130 28 NA NA NA 4.4 NA ND NA NA 2.5 NA <br /> 12/22/98 <50 <1.0 <1.0 <1.0 < 8 NA NA <br /> 03/18/99 < 1.0 c1.0 <7.0 <2.0 <LO c1.0 <1.0 NA <3.0 <2.0 NA NA <br /> 50 <0.50 NA NA NA <0.50 NA NA NA NA <0.50 NA NA <0.50 NA NA <br /> 06/17/99 <50 17.3 NA NA NA 2.7 NA NA NA NA <1.0 <1.0 <3.0 3.3 NA NA <br /> 09/16/99 270 56.4 NA NA NA 9.38 NA NA NA <br /> NA 6.4 NA NA NA NA <br /> 12/13/99 <50 <1.0 <1,0 <1.0 c1.0 <1.0 <1.0 <2.0 <1.0 <1.0 <1.0 <1.0 <1.0 <2.2.0 NA NA <br /> 06/15/00 138 8.4 <1.0 0.0 0.0 5.5 <1.0 <2.0 <1.0 0.0 <1.0 <1.0 0.0 5.6 NA <br /> NA <br /> VAPOR EXTRACTION WELLS <br /> VEW-2B <br /> 03/18/98 37.80 81800 6040 <100 <100 <100 3020 149 <200 842 460 13800 2990 820 15290 NA <br /> NA <br /> 06/24/98 35.99 65000 3670 <100 000 <200 1840 <100 <200 447 134 13400 2450 633 15230 NA NA <br /> 09/16/98 38.93 71200 2600 <100 <100 <100 2990 152 <200 598 359 7730 3250 819 15060 NA NA <br /> 12/22/98 33.41 43700 2610 <100 <100 <100 1420 <100 <200 560 169 6060 2420 603 10870 NA <br /> 03/18/99 31.18 31000 3040 <100 <100 <100 913 <100 <200 210 106 3080 1470 373 7230 NA NA <br /> 06/18/99 34.32 15000 2070 <100 <100 <100 1860 108 <200 815 208 4640 2610 670 12830 NA NNA <br /> A <br /> Not accessble due to the presence of remediation equipment <br /> VEW-3 <br /> 03/18/98 38.03 96000 3630 185 <100 <100 4190 146 <200 722 526 21700 3570 978 22390 NA NA <br /> 06/24/98 35.90 132000 4260 784 <100 <200 6210 330 <200 997 1150 20600 8870 2650 33790 NA <br /> 09/16/98 38.77 119000 1900 <100 <100 <100 4220 <100 <200 336 <100 25900 3840 1160 23570 NA NA <br /> 12!22/98 33.52 87200 4330 <100 <130 <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 NMA <br /> A <br /> 06/18/99 34.10 46600 2240 <100 <100 <100 4340 <100 <200 1550 434 15200 3890 1000 24600 NA <br /> Not accessible due to the presence of remediation equipment NA <br /> VEW-4 <br /> 03/18/98 38.00 22900 3050 <50 <50 <50 1220 65 <100 390 190 465 1230 420 2907 NA NA <br /> 06/24/98 35.68 9200 1180 <10 <10 <50 173 13 <20 18 14 79 367 181 738 NA NA <br /> 09/16/98 38.52 7110 315 <1.0 17 -<1.0 150 34.8 <2.0 13.8 50.4 3.8 534 234 272.7 NA NA <br /> 12/22/98 33.41 4240 271 <10 15 <10 81 11 <20 30 14 42 118 94 208 NA NA <br /> 03/18/99 31.09 5160 326 <1.0 2.8 0.0 129 7.3 <2.0 28 12.5 249 136 61.4 539 NA NA <br /> 08/18/99 33.83 2350 400 <1.0 0.0 <1.0 61.9 7.1 <2.0 18.2 8.4 149 124 53.2 433 NA NA <br /> Not accessible due to the presence of remediation equipment <br /> y 06940-293 <br /> 32 0135 ENSR corporation <br />