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TABLE 1 <br /> HISTORICAL GROUNDWATER DATA <br /> Former Discovery Chevrolet <br /> 161511'Street <br /> Tracy, California <br /> Well. NoJ Date Total Depth to Groundwater Floating Chlorinated <br /> Elev.1 Sampled Depth' Water' Elevation Product TPHg Benzene Toluene Ethylbenzene Xylenes MTBE TPHd. O&G Halocarbons <br /> (ft.) (ft.) (ft.) (ft.) (ppb) (ppb) (ppb) (ppb) ( b) (ppb) __(ppb) (ppb) (ppb) <br /> Explanation: Analytical Laboratory: <br /> TPHg = Total Petroleum Hydrocarbons as gasoline O&G = Oil and Grease American Environmental Network(FLAP#1172) <br /> TPHd = Total Petroleum Hydrocarbons as diesel ppb = parts per billion Analytical Methods: <br /> BTEX = benzene, toluene, ethylbenzene, and total xylenes ft. = feet TPHg: EPA Methods 5030/8015 (GCFID) <br /> MTBE = methyl tert-butyl ether na = not analyzed TPHd: EPA Method 3510/8015 (GCFID) <br /> nd = none detected at or above laboratory reporting limits ---- = not applicable BTEX/MTBE: EPA Method 8020 <br /> Oxygenates = t butanol(TBA), methyl tert-butyl ether(MTBE), di-isopropyl ether(DIPE), O&G: Standard Method 5520 B&F <br /> ethyl-t-butyl ether(ETBE), and t-amyimethyl ether(TAME). Oxygenates: EPA Method 8260 <br /> 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). <br /> 2 Also analyzed for oxygenates by EPA Method 8260. None of the oxygenate compounds, including MTBE, were detected. <br /> 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. <br /> 4 Analysis for MTBE by EPA Method 8020 reported 8.0 ppb. Confirmation by EPA 8260 did not detect MTBE. <br /> 5 Analysis for MTBE by EPA Method 8020 reported 12 ppb. Confirmation by EPA 8260 did not detect MTBE. <br /> 8146.04-5 Page 3 of 3 <br />