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TABilE 1 <br /> HISTORICAL GROUNDWATER DATA <br /> Former Discovery Chevrolet <br /> 161511'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 Halocarbons <br /> (ft.) (ft.) (ft.) (ft.) (ppb) ( h) (ppb) (ppb) ( b) (ppb) (ppb) ( b) (ppb) <br /> MW-31 02/20/96 19.5 10.18 35.41 ---- <50 <0.5 <0.5 <0.5 <0.5 na 60 na nd <br /> 45.59 05/13/96 19.5 10.51 35.08 ---- <50 <0.5 <0.5 <0.5 <0.5 na <50 na nd <br /> 08/13/96 19.5 11.48 34.11 ---- na na na na na na 60 na nd <br /> 11/21/96 19.5 10.46 35.13 ---- na na na na na <5 <50 na nd <br /> 03/18/97 19.5 10.33 35.26 ---- <50 <0.5 <0.5 <0.5 <0.5 <S <50 na na <br /> Explanation• <br /> TPHg = Total Petroleum Hydrocarbons as gasoline Analytical Laborato�: <br /> TPHd = Total Petroleum Hydrocarbons as diesel American Environmental Network(ELAP#1172) <br /> O&G = Oil and Grease <br /> BTEX = Benzene, Toluene, Ethylbenzene, and total Xylenes Analytical Methods: <br /> MTBE = Methyl t-Butly Ether TPHg: EPA Methods503018015 (GCFID) <br /> nd = none detected at or above laboratory reporting limits TPHd: EPA Method 3510/8015 (GCFID) <br /> ppb = parts per billion BTEXIMTBE: EPA Method 8020 <br /> ft. = feet O&G: Standard MEthod 5520 B&F <br /> na = not analyzed Chlorinated Halocarbons: EPA 8010 <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 /> Page 2 of 2 <br /> 8146.03- <br />