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TAB 1 HISTORICAL GRC ,7WATER DATA Former Discovery Chevrolet 161511 th Street Tracy, California Well. No./ Date Total Depth to Groundwater Floating Chlorinated Elev.' Sampled Depth' Water' 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-5 03/06/98 20.0 9.58 35.56 ---- <50 <0.5 0.6 <0.5 <2 <5 na na na 06105/98 20.0 10.16 34.98 ---- <50 <0.5 <0.5 <0.5 <2 <5 na na na 09/08/98 20.0 10.67 34.47 ---- <50 <0.50 <0.50 <0.50 <0.50 <2.5 na na na 09/08/98 20.0 10.32 31.82 ---- <50 <0.50 <0.50 <0.50 <0.50 <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 09/08/98 ---- ---- ---- ---- <50 <0,50 <0.50 <0.50 <0.50 <2.5 na na na 12/07/98 ---- ---- ---- ---- <50 <0.50 <0.50 <0.50 <0.50 <2.5 na na na Explanation: Analytical Laboratory- TPHg = Total Petroleum Hydrocarbons as gasoline 9194- 6198 = American Environmental Network(ELAP#1172) TPHd = Total Petroleum Hydrocarbons as diesel >9/98 = Sequoia Analytical (ELAP#1210, #1271) BTEX = benzene, toluene, ethylbenzene, and total xylenes MTBE - methyl tert-butyl ether nd = none detected at or above laboratory reporting limits Analytical Metho(lsu Oxygenates = t-butanol (TBA), methyl tert-butyl ether (MTBE), di-isopropyl ether (DIPS), TPHg: EPA Methods 5030/8015 (GCFID) ethyl-t-butyl ether(ETBE), and t-amylmethyl ether(TAME). TPHd: EPA Method 3510/8015 (GCFID) O&G = Oil and Grease BTEXIMTBE: EPA Method 8020 ppb = parts per billion 0&G: Standard Method 5520 B&F ft. = feet Oxygenates: EPA Method 8260 na = not analyzed ---- = not applicable '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. '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. 8146.048 Page 3 of 3