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TABLE 4 HISTORICAL ANALYTICAL RESULTS OF GROUND WATER SAMPLES EPA METHODS 8015M/8021 Former Chase Chevrolet(Madison) Facility 423 North Madison Street, Stockton, California (ug/1) ' Sample Sample Depth Ethyl- Xylene Location Date 10 TPH-g TPH-d TPH-mo MTBE Benzene Toluene benzene s screen Water MW-21A 08-12-98 1318 9,000 7,800 320 --- 210 55 230 47 (12-32) 11-03-98 1476 3,200 18,000 1,200 <10 170 27 160 39 02-02-99 1419 4,200 6,500 500 <10 240 <0 5 210 45 05-05-99 13 53 5,200 8,900 <250 <5 0 170 30 140 31 08-11-99 1390 2,900 8,600 <250 <10 190 47 120 27 11-09-99 15 13 <50 110 <250 <5 0 <0 5 <0 5 <05 <05 02-08-00 1458 3,800 3,100 810 <18 1,500 38 1,200 66 05-10-00 1290 3,900 2,400 300 <50 210 31 97 14 08-21-00 1374 2,900 2,900 320 <50 210 27 180 61 11-28-00 15 07 2,700 3,200 630 <5 0 230 20 230 13 02-28-01 1436 2,200 5,100 3,000 <5 0 180 22 130 83 05-21-01 1436 11,000 4,900 1,900 <5 0 150 28 110 <0 5 08-16-01 1493 3,300 8,800 750 <5 0 160 23 180 58 11-14-01 1603 3,000 6,900 840 <10 190 27 230 5 0 02-13-02 1525 4,500 7,700 930 <50 200 27 200 12 05-16-02 15 32 7,300 8,100 <2,500 <10 130 1 7 160 3 8 MW-19B 8-12-98 1580 <50 360 790 --- <05 <05 <0 5 <05 (485- 11-03-98 17 13 <50 100 <250 <5 0 <05 078 <05 072 • 53 5) 02-02-99 1659 <50 130 <250 <5 0 <05 <0 5 <05 <05 05-05-99 1559 <50 <50 <250 <5 0 12 46 1 5 68 08-11-99 1636 <50 <50 <250 <50 068 22 13 51 11-09 99 1741 <50 <50 <250 <5 0 <05 <0 5 <0 5 <0 5 02-08-00 1690 <50 53 <250 <5 0 <05 <05 <05 <0 5 05-0900 1500 <50 <50 <250 <5 0 <05 <0 5 <05 <0 5 08-21-00 16 11 <50 <50 <250 <5 0 <05 <05 <05 <0 5 11-28-00 1724 <50 71 <250 <5 0 <05 <05 <0 5 <0 5 02-28-01 1647 <50 <50 <250 <5 0 <0 5 <05 <0 5 <0 5 ' 05-21-01 1657 <50 <50 <250 <5 0 <05 <05 <0 5 <0 5 08-16-01 1745 <50 <50 <250 <5 0 <0 5 <05 <05 <05 11-14-01 1938 <50 <50 <250 <5 0 <0 5 <05 <05 <05 02-13-02 1742 <50 <50 <250 <5 0 <05 <05 <05 <05 05-16-02 1765 <50 <50 <250 <5 0 <05 <05 <05 <05 MW-20B 08-12-98 1632 <50 710 520 --- <05 056 <05 <05 (50-55) 11-03-98 1762 <50 140 <250 <50 <05 <05 <05 <05 02-02-99 17 11 <50 120 <250 <5 0 <05 057 <05 <0 5 05-05-99 16 15 140 190 <250 <50 65 21 53 25 08-11-99 1680 54 <50 <250 <5 0 061 1 7 069 27 11-09-99 1790 490 290 330 <5 0 063 <0 5 2 7 26 02-08-00 1743 <50 210 <250 <5 0 <05 <0 5 <05 <0 5 05-10-00 1554 <50 190 <250 <5 0 <05 <0 5 <05 <0 5 08-21-00 1664 <50 <50 <250 <5 0 <05 <0 5 <05 1 7 11-28-00 1773 <50 61 <250 <5 0 <05 <0 5 <05 <0 5 02-28-01 1703 <50 <50 <250 <50 <05 <0 5 <05 <0 5 05-21-01 1704 <50 <50 <250 <5 0 <05 <0 5 <0 5 <0 5 08-16-01 1796 <50 <50 <250 <50 <05 <0 5 <0 5 <0 5 11-14-01 1891 <50 <50 <250 <50 <05 <0 5 <05 <0 5 02-13-02 1797 <50 <50 <250 <5 0 <05 <05 <05 <0 5 05-16 02 18 20 <50 <50 <250 <5 0 <0 5 <0 5 <05 <05 (.1 ' Advanced GeoEnvironmental,Inc