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TABLE 1 HISTORICAL GROUNDWATER DATA Former Discovery Chevrolet 1615 11th Street' Tracy, California Well. No./ Date Total Depth to Groundwater Floating Chlorinated Elev.' Sampled Depth' Water' Elevation Product TPHg Benzene Toluene Ethylbenzene Xylenes TPHd O&G Hydrocarbons (ft.) (ft.) (ft.) (ft.) (ppb) , ._..,(PPb) (ppb) (ppb) (ppb) (ppb) ,.. (ppb) (Ppb) MW-1/ 09/16/94 20.0 9.97 .35.03 ---- 640 35 40 6.8 72 na na na 45.00 03/08/95 20.0 10.05 34.95 ---- 3,900 730 510 140 430 na na na 05/17/95 20.0 10.02 34.98 ---- 400 120 36 12 43 na na na 08/07/95 20.0 10.98 34.02 ---- 1,400 250 170 64 170 na na na 12/20/95 20.0 9.86 35.14 ---- 17,000 3,100 2,000 670 -2,400 na na na 02/20/96 20.0 9.25 35.75 ---- 3,300 880 310 230 390 na na na MW-2/ 09/16/94 19.5 10.07 34.91 ---- -7,600 370 180 260 680 na na na 44.98 03/08/95 19.5 10.12 34.86 ---- 1,000 180 47 57 180 na na na 05/17/95 19.5 10.08 34.90 ---- 100 37 11 5.5 21 na na na 08/07/95 19.5 10.89 34.09 --- 60 10 3 2 9 na na na 12/20/95 19.0 9.98 35.00 ---- 9,700 1,000 150 480 1,100 na na na 02/20/96 19.5 9.62 35.36 ---- 8,600 800 150 430 1,000 na na na MW-3/ 09/16/94 19.5 10.49 35.10 ---- <50 <0.5" <0.5 <0.5 <0.5 <50 <10,000 na 45.59 03/08/95 19.5 10.65 34.94 ---- <50 <0.5 <0.5 <0.5 <0.5 200 <1,000 na 05/17/95 19.5 10.66 34.93 ---- <50 <0.5 <0.5 <0.5 <2 <50 <1,000 na 08/07/95 19.5 11.53 34.06 ---- <50 <0.5 <0.5 <0.5 <0.5 <50 <1,000 na 12/20/95 19.5 10.49 35.10 --- <50 <0.5 <0.5 <0.5 <0.5 <50 <1,000 nd 02/20/96 19.5 10.18 35.41 ---- <50 <0.5 <0.5 <0.5 <0.5 60 na nd Notes: Groundwater depths measured from surveyed top of the north side of the well casing. Well casing elevations surveyed to MSL by Virgil Chavez Land Surveying(PLS 6323). TPHg = Total Petroleum Hydrocarbons as gasoline ppb = parts per billion nd = none detected at or above laboratory reporting limits TPHd = Total Petroleum Hydrocarbons as diesel ft. = feet O&G = Oil and Grease na = not analyzed 8146.03-1 i