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TABLE 1 <br /> HISTORICAL GR( _DWATER DATA <br /> f Former Discovery Chevrolet <br /> 1615 11th Street <br /> Tracy,California <br /> Well,No./ Date Total Depth to Groundwater Floating Chlorinated <br /> Elev.` Sampled Depth' Water' Elevation Product TPHg Benzene Toluene Ethylbenzene Xylenes MTBE TPHd O&G Haiocarbons <br /> (ft.) (ft.) (ft.) (ft.) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) <br /> Trip Blank 06/12/97 ---- ---- ---- ---- <50 <0.5 <0.5 <0.5 <0.5 <5 na na na <br /> 09/17/97 ---- ---- ---- ---- <50 <0.5 <0.5 <0.5 <0,5 <5 na na na <br /> 03/06/98 ---- ---- ---- ---- na na na na na na na na na <br /> 06/05/98 ---- ---- ---- ---- <50 <0.5 <0.5 <0.5 <2 <5 na na na <br /> 09/08/98 ---- ---- ---- ---- <50 <0.50 <0.50 <0.50 <0.50 <2.5 na na na <br /> Explanation: Analvtical Laboratory: <br /> TPHg=Total Petroleum Hydrocarbons as gasoline 9194 -6198=American Environmental Network(FLAP#1172) <br /> TPHd=Total Petroleum Hydrocarbons as diesel 9198=Sequoia Analytical(FLAP#1210) <br /> BTEX=benzene,toluene, ethylbenzene, and total xylenes <br /> MTBE= methyl tert-butyl ether <br /> nd=none detected at or above laboratory reporting limits Analytical Methods: <br /> Oxygenates=t-butanol(TBA), methyl tert-butyl ether(MTBE),di-isopropyl ether(RIPE), TPHg: EPA Methods 5030/8015 (GCFID) <br /> ethyl-t-butyl ether(ETRE),and t-amylmethyl ether(TAME). TPHd: EPA Method 3510/8015 (GCFID) <br /> O&G=Oil and Grease BTEX/MTBE: EPA Method 8020 <br /> ppb=parts per billion O&G: Standard Method 5520 B&F <br /> ft. =feet Oxygenates: EPA Method 8260 <br /> na=not analyzed <br /> ----=not applicable <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 46323). <br /> 2 Also analyzed for oxygenates by EPA Method 8260. None of the oxygenate compounds, including MTBE, were detected. <br /> '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 /> s Analysis for MTBE by EPA Method 8020 reported 12 ppb. Confirmation by EPA 8260 did not detect MTBE. <br /> 8146.04-7 <br /> Page 3 of 3 <br />