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S TABLE 3 ' HISTORICAL ANALYTICAL RESULTS OF GROUND WATER SAMPLES EPA METHODS 8015M, 8020, 8021B Former Chase Chevrolet (Van Buren) Facility 424 North Van Buren Street, Stockton, California (ug/1) ' Sample Sample Depth to TPH as Ethyl- Location Date Water Gasoline MTBE Benzene Toluene benzene Xylene (Screen) MW-6 01-10-91 2652 2,900 NA 210 130 56 360 (209-45) 02-27-92 2773 12,000 NA 730 450 360 880 ' 05-28-92 2751 11,000 NA 320 140 120 510 09-16-92 1 2796 4,500 NA 210 100 87 450 11-05-92 2824 5,300 NA 240 250 97 560 02-11-93 2792 6,500 NA 260 56 59 290 ' 02-08-94 2716 2,800 NA 180 110 130 480 05-04-94 2714 3,600 NA 210 210 150 670 08-05-94 2680 1,600 NA 88 76 91 350 I2-20-94 2738 5,000 NA 200 160 200 1,100 05-11-95 2412 3,100 NA 130 100 150 370 10-05-95 2303 2,400 NA 140 63 180 280 02-09-96 2269 1,500 NA 65 50 92 220 • 05-08-96 2079 6,500 <7 270 270 380 1,400 08-08-96 2059 6,100 <50 330 160 360 900 11-06-96 2108 5,100 <95 290 110 380 860 02-05-97 1603 830 <5 0 56 17 17 190 05-07-97 18 18 1,200 <5 0 88 1 2 110 130 08-06-97 1838 950 <5 0 80 31 69 140 11-05-97 1912 2,600 <8 220 2 4 220 340 02-05-98 1608 470 <50 32 <0 5 42 38 05-08-98 1386 2,600 <50 ISO 1 1 250 290 08-13-98 1447 2,100 <10 130 2 7 220 260 11-04-98 1626 1,600 <5 0 88 062 160 170 02-04-99 1560 1,200 <5 0 66 0 63 130 130 ! 05-05-99 1476 2,100 <50 76 3 7 170 160 08-10-99 1530 <50 <50 <0 5 <0 5 <0 5 <0 5 11-10-99 1651 1,400 <50 66 31 64 61 02-09-00 15 87 710 <5 0 17 0 84 81 21 05-11-00 1460 1,200 <1 0 24 <0 5 120 67 08-22-00 1504 150 <5 0 3 0 <0 5 14 3 0 11-28-00 16 16 1,400 <50 21 16 79 86 02-28-01 1571 100 <50 1.9 <0 5 12 070 05-21-01 1568 390 <50 45 <0 5 29 23 08-16-01 1636 330 <50 58 <0 5 36 12 11-14-01 1733 620 <50 238 1.3 65 3.1 02-13-02 1626 340 <5 0 6.1 1 l 71 15 05-16-02 1646 96 <5 0 23 <0 5 059 <05 09-30-02 1756 190 <5 0 57 <0 5 44 1 1 12-02-02 18 00 120 <50 15 <0 5 <05 <0 5 OZ-21-03 17 26 <50 <5 0 <0 5 <0 5 <0 5 <0 5 • Advanced GeoEnvironmental,Inc