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I , 1 1 � I 1 TABLE 4 1' HISTORICAL ANALYTICAL RESULTS OF GROUND WATER SAMPLES i ' EPA METHODS 8015M/8020/8021B Former Chase Chevrolet (Madison) Facility 423 North Madison Street, Stockton, California ' (ILg/1) Locatpion Sample Doth ITPH-g ITPH-d TPH-mo MTBE Benzene toluene Ethyl Xylene screen Date Water benzene MW-21B 08-12-98 1504 2,600 1,600 <250 NA 20 35 67 27 (48-53) 11-03-98 1644 2,200 1,600 320 <50 12 1 2 49 26 02-02-99 1587 1,300 1,200 <250 <5 0 80 <0 5 49 13 05-05-99 1566 1,300 700 <250 <5 0 86 17 29 28 08-11-99 1582 1,400 700 <250 <5 0 <1 15 16 86 11-09-99 1670 <50 <50 <250 <5 0 <0 5 <0 5 <0 5 <0 5 02-08410 1567 800 460 330 60 24 <0 5 41 16 05-10-00 1425 1,400 920 360 <5 0 <0 5 <0 5 1 1 63 08-21-00 1425 1,200 1,100 <250 <5 0 <0 5 <0 5 1 1 056 ' 11-2800 16 12 730 360 <250 <5 0 <0 5 <0 5 1 1 39 02-2801 1575 650 ' 270 <250 <5 0 <0 5 <0 5 058 <0 5 05-21-01 1583 930 630 <250 <5 0 <0 5 <0 5 057 <0 5 08-16-01 1671 680 1,100 250 <5 0 <0 5 <0 5 052 <0 5 11-14-01 1775 860 420 <250 <5 0 <0 5 <0 5 1 1 <0 5 ' 02-13-02 1670 700 620 <250 <20 <0 5 30 <0 5 <0 5 05-16-02 1691 750, 260 <250 <5 0 <0 5 <0 5 075 45 09-30-02 18 11 NS NS NS NS NS NS NS NS 12-02-02 1831 NS NS NS NS NS NS NS NS 02-21-03 17 84 NS NS NS NS NS NS NS NS 05-08-03 1767 830 430 <250 NA <0 5 <0 5 <0 5 75 08-07-03 1902 NS NS NS NS NS NS NS NS 10-30-03 1856 610 620 <250 <5 0 <05 <0-5 075 18 I I MW-25 08-07-03 1999 <50 <50 NA <5 0 <0 5 <0 5 <0 5 <0 5 ' 10-30-03 199 <50 <50 <250 <5 0 <0 5 <0 5 <0 5 <0 5 Nates µg/I micrograms per liter TPH 8 Total Petroleum Hydrocarbons quantified as gasoline " TPH-d Total Petroleum Hydrocarbons quantified as diesel TPH mo Total Petroleum Hydrocarbons quantified as motor oil INS Not sampled NA Not analyzed 10-30-03 Samples identified as MW-19A/B appear to have been collected from wells MW-21 A/B I ISI i tAdvanced GeoEnvironmental,Inc' t