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TABLE:1 HISTORICAL GROUNDWATER DATA Former Discovery Chevrolet 161511' Street Tracy, California Well. No./ Date Total Depth to Groundwater Floating Chlorinated Elev.' Sampled Depths Water' Elevation Product TPHg Benzene Toluene Ethylbenzene Xylenes MTBE TPHd O&G Halocarbons (ft.) (ft.) ft.) (£t.) b) (ppb) b) (ppb) 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 ---- 17,000 3,100 2,000 670 2,400 na 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 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 ✓440 -59 X150 -450 -15 na na na MW-3/ 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 Refer to pMe 2 for Explanation. 8146.04-5 Page 1 of 2