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TABLE l <br /> HISTORICAL GROUNDWATER DATA <br /> Former Discovery Chevrolet <br /> 16H le Street <br /> Tracy,California <br /> Well.No./ Date Total Depth to Groundwater Floating Chlorkw0d <br /> Rev.' Sanpled Depth' Water` Elevation Product TWq Benzew Toluene Ethylbenacme Xylenes MTBE TPHd O&G Halocarborn <br /> (R.) (N (W (ft.) (opb) (Ppb) (ppb) (ppb) (Ppb) (ppb) (nob) (Ppb (ppb) <br /> Exotanalwo: AnalvtiW Labonton: <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 biltion Anahtcal Methods: <br /> BTEX -bea=n,toluene,etbylbeamne,and total xylenes ft. = feet TPHg: EPA Methods 503 0180 1 5(GCFID) <br /> MTBE = methyl tent-butyl ether on = not analyzed TPHd: EPA Method 3510/8015(GCFID) <br /> ad =now detected at or above laboratory reporting limits -- = not applicable BTEX/MTBE: EPA Method 8020 <br /> Oxygenates= t-bats wl(TBA),methyl tert-butyl other(MTBE),di-isopropyl ether(DIPE), O&G: Standard Method 5520 B&F <br /> ethyl-t-butyl ether(ETRE),and t-amytmethyl ether('FAME). Oxygenates: EPA Method 8260 <br /> 1 Measured from surveyed top of the north side of the well casing. Weli casing elevations surveyed to MSL by Virgil Chavez Land Surveying(PLS#6323). <br /> 2 Also analyzed for oxygenates by EPA Metbod 8260. None of the oxygenate compounds, including MTBE,were detected. <br /> 3 Also analyzed for oxygenates by EPA Method 8260. MTBE detected at a conceanxtion of 6 ppb. MTBE reported as not detected by EPA 8020. <br /> `Analysis for MTBE by EPA Method 8020 reported 8.0 ppb. Confirmation by EPA 8260 did not detect MTBE. <br /> 3 Analysis for MTBE by EPA Method 8020 reported 12 ppb. Coafirmation by EPA 8260 did not detecxe MTBE. <br /> at46.a.s <br /> Pane 3 of 3 <br />