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HISTORICAL GROUNDWATER DATA <br /> Former Discovery Chevrolet <br /> 1615 11`s Street <br /> Tracy, California <br /> Explanation: <br /> TPHg = Total Petroleum Hydrocarbons as gasoline Analytical Laboratory: <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 Methods5030/8015(GCFID) <br /> nd = none detected at or above laboratory reporting limits TPHd: EPA Method 3510/8015 (GCFID) <br /> ppb = parts per billion BTEX/MTBE: EPA Method 8020 <br /> ft. = feet O&G: Standard MEthod 5520 B&F <br /> na = not analyzed Chlorinated Halocarbons: EPA 8010 <br /> t 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 /> r.. <br /> 8146.03-4 <br /> �� Page 2 of 2 <br />