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TAB I HISTORICAL GROUNDWATER DATA Former Discovery Chevrolet 1615 11'h Street Tracy, California Well. Nod Date Total Depth to Groundwater Floating Chlorinated Elev.' Sampled Depth' Water' Elevation Product TPHg Benzene Toluene Ethylbenzene Xylenes MTBE TPHd 0&G Halocarbons (ft.) ft.) (ft.) ft.) ( b) b) b) b) b) b) b) b) b) MW-1/ 09/16/94 20.0 9.97 35.03 --- 640 35 40 6.8 72 na na na na 45.00 03/08/95 20.0 10.05 34.95 ---- 3,900 730 510 140 430 na na na na 05/17/95 20.0 10.02 34.98 ---- 400 120 36 12 43 na na na na 08/07/95 20.0 10.98 34.02 --- 1,400 250 170 64 170 na na na na 12/20/95 20.0 9.86 35.14 ---- , a na na na 02/20/96 20.0 9.25 35.75 ---- 3,300 880 310 230 390 na na na na 05/13/96 20.0 9.94 35.06 ---- 5,800 980 510 320 730 na na na na 08/13/96 20.0 10.83 34.17 ---- 100 20 17 7.9 18 <5 na na na 11/21/96 20.0 9.87 35.13 ---- 510 190 31 22 89 13 na na na 03/18/97 20.0 9.73 35.27 ---- <50 4.0 1.1 0.5 1.8 <5 na na na 06/12/97 20.0 9.97 35.03 ---- 1,500 310 120 110 380 12 na na na 09/17/97 20.0 10.12 34.88 ---- 80 8.5 1.8 5.4 14 <5.01 na na na MW-2/ 09/16/94 19.5 10.07 34.91 ---- 7,600 370 180 260 680 na na na na 44.98 03/08/95 19.5 10.12 34.86 --- 1,000 180 47 57 180 na na na na 05/17/95 19.5 10.08 34.90 ---- 100 37 11 5.5 21 na na na na 08/07/95 19.5 10.89 34.09 --- 60 10 3 . 2 9 na na na na 12/20/95 19.0 9.98 35.00 ---- 9,700 1,000 150 480 1,100 na na na na 02/20/96 19.5 9.62 35.36 ---- 8,600 800 150 430 1,000 na na na na 05/13/96 19.5 10.04 34.94 ---- 8,200 740 160 390 1,200 na na na na 08/13/96 19.5 10.95 34.03 --- <50 1.1 0.8 0.7 2.8 <5 na na na 11/21/96 19.5 9.97 35.01 ---- <50 4.7 1.6 1.5 7 .<5 na na na 03/18/97 19.5 9.87 35.11 ---- 90 8.7 1.2 3.4 10 <5 na na na 06/12/97 19.5 10.08 34.90 ---- 2,400 240 39 150 450 15 na na na 09/17/97 19.5 10.23 34.75 ---- 250 4.1 <0.5 1.3 5 63 na na na MW-31 09/16/94 19.5 10.49 35.10 ---- <50 <0.5 <0.5 <0.5 <0.5 na <50 10,00 na 45.59 03/08/95 19.5 10.65 34.94 ---- <50 <0.5 <0.5 <0.5 <0.5 na 200 <1,00 na 05/17/95 19.5 10.66 34.93 --- <50 <0.5 <0.5 <0.5 <2 na <50 <1,00 na 08/07/95 19.5 11.53 34.06 ---- <50 <0.5 <0.5 <0.5 <0.5 na <50 <1,00 na 02/20/96 19.5 10.18 35.41 ---- <50 <0.5 <0.5 <0.5 <0.5 na 60 na nd 05/13/96 19.5 10.51 35.08 ---- <50 <0.5 <0.5 <0.5 <0.5 na <50 na nd Refer to a e 2 for Explanation. 8146.04-5 Page 1 of 2