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TABLE 1 HISTORICAL GROUNDWATER DATA Former Discovery Chevrolet 161511' Street Tracy, California Well. Nod Date Total Depth to Groundwater Floating Chlorinated Elev.l Sampled Depths Waters Elevation Product TPHg Benzene Toluene Ethylbenzene Xylenes MTBE TPHd O&G Halocarbons (ft.) (ft.) (ft.) (ft.) (ppb) (ppb) (ppb) (ppb) (PPb)__ (Ppb) (Ppb) _(Ppb) (ppb) MW-51 12/18/97 20.0 10.22 34.92 ---- <50 <0.5 <0.5 <0.5 <2 <52 na na na 45.14 03/06/98 20.0 9.58 35.56 ---- <50 <0.5 0.6 <0.5 <2 <5 na na na 06/05/98 20.0 10.16 34.98 ---- <50 <0.5 <0.5 <0.5 <2 <5 na na na DW 06/05/98 85.0 4.85 ---- ---- <50 <0.5 <0.5 <0.5 <2 <5 na na na Trip Blank 06/12/97 ---- ---- ---- ---- <50 <0.5 <0.5 <0.5 <0.5 <5 na na na 09/17/97 ---- ---- ---- ---- <50 <0.5 <0.5 <0.5 <0.5 <5 na na na 03/06/98 ---- ---- ---- ---- na na na na na na na na na 06/05/98 ---- ---- ---- ---- <50 <0.5 <0.5 <0.5 <2 <5 na na na Explanation: Analytical Laboratory: TPHg = Total Petroleum Hydrocarbons as gasoline 0&G = Oil and Grease American Environmental Network(ELAP#1172) TPHd = Total Petroleum Hydrocarbons as diesel ppb = parts per billion Analvtical Methods: BTEX = benzene, toluene, ethylbenzene, and total xylenes ft. = feet TPHg: EPA Methods 5030/8015 (GCFID) MTBE = methyl tert-butyl ether na = not analyzed TPHd: EPA Method 3510/8015 (GCFID) nd = none detected at or above laboratory reporting limits ---- = not applicable BTEXIMTBE: EPA Method 8020 Oxygenates = t-butanol (TBA), methyl tert-butyl ether(MTBE), di-isopropyl ether(DIPS), O&G: Standard Method 5520 B&F ethyl-t-butyl ether(ETBE), and t-amylmethyl ether(TAME). Oxygenates: EPA Method 8260 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). 2 Also analyzed for oxygenates by EPA Method 8260. None of the oxygenate compounds, including MTBE, were detected. 3 Also analyzed for oxygenates by EPA Method 8260. MTBE detected at a concentration of 6 ppb. MTBE reported as not detected by EPA 8020. 4 Analysis for MTBE by EPA Method 8020 reported 8.0 ppb. Confirmation by EPA 8260 did not detect MTBE. 5 Analysis for MTBE by EPA Method 8020 reported 12 ppb. Confirmation by EPA 8260 did not detect MTBE. 8146.04-5 Page 3 of 3