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TABLE 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES EPA Method 80151802018260 Modified Former Curtiss Pontiac-Buick - 2450 Toste Road, Tracy, California dr- ethyl metbyl ternary Well Sample 1 di ft? _ Ethyl- isopropyl tertiary tcruary- amyl tertiary hitt 1 D TPP g c1 13wzene Toluetie xylenes methyl alcohol SC)een Date GW beuzene ether butyl ether butyl ether ether (TBA) (D1PE (ETRE) (MTBE~) 'TAME WAA 02-27-98 490 4,300 1,400 200 41 29 560 <5 0 <5 0 <5 0 <5 0 <5 0 23 - 28 09-28-98 706 220 <50 15 37 45 1.7 <1 0 <1 0 <1 0 <1 0 <5 0 12-17-98 686 58 <50 42 3 1 20 30 <1 0 <1 0 <1 0 <1 0 <5 0 03-25-99 689 71 <50 081 093 1 2 082 <1 0 <1 0 <1 0 <1 0 <5 0 06-21-99 709 200 68 16 21 44 21 <1 0 <10 <1 0 <1 0 <5 0 09-21-99 694 63 <50 57 39 <0 5 25 <1 0 <1 0 <1 0 <1 0 <5 0 12-07-99 697 <50 <50 21 083 <0 5 17 <1 0 <1 0 <1 0 <1 0 <5 0 03-17-00 6 78 <50 1 <50 <0 5 <0 5 <0 5 <0 5 <1 0 <1 0 <1 0 <1 0 <5 0 WAB 02-27-98 5 25 5,000 1,200 480 140 8.9 600 <5 0 <5 0 <5 0 <5 0 <5 0 5 - 15 09-28-98 701 2,000 160 530 260 55 130 <1 0 <1 0 99 <1 0 <5 0 12-17-98 702 560 93 270 36 13 22 <1 0 <1 0 14 <1 0 <5 0 03-25-99 688 3,600 290 1,300 120 110 88 <5 0 <1 0 23 <1 0 <5 0 06-21-99 700 3,400 130 740 400 59 220 <1 0 <1 0 13 <1 0 <5 0 09-21-99 690 2,400 210 540 200 58 120 <1 0 <1 0 30 <1 0 <5 0 12-07-99 705 1,300 84 390 79 31 55 <1 0 <1 0 89 <1 0 <5 0 03-17-00 662 1 190 1 <50 1 78 1 19 1 30 21 1 <1 0 1 <1 0 1 83 1 <1 0 t <5 0 Notes Ground a ater depth measurements in feet pg� microgramsper ltteTorparts per billion,ppb rm g Total petroleum hydrocarbons quantified as gasoline TPII d Total petroleum h)drocarbons quantified as diesel *ground crater sample collected tram 2420 Grant Line Road Concentrations in italics indicate suspected cross-contanunanon Advanced GeoEnvironmental Inc I