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rl(a' <br /> Groundwater Monitot inn and Analytical Results <br /> Former Unocal Service Station#2859 <br /> 1665 Pacific Avenue <br /> Stockton, California <br /> Well ID/ Date DTW GWE TPII(G) Ii T E X MTBE <br /> TOC* (ft) (ms!) C-- ppb_ <br /> Trip Blank <br /> TB-LB 03106/98 — -- ND ND ND ND ND ND <br /> EXPLANATIONS <br /> Groundwater monitoring data and laboratory analytical results prior to March 6, 1998, were compiled from reports prepared by MPDS Services, Inc <br /> G = 7 otal KtrDlettnt hydrocarbons as Gasoline <br /> TOC = Top of Casing elevation 1 Pll( ) MTBE = Methyl tertiary butyl ether <br /> DTW = Depth to Water B = Benzene <br /> (h) = Feet T = Toluene ppb = Parts per billion <br /> GWE = Groundwater Elevation E = Ethylbeuzene ND = Not Detected <br /> X = X leites -- = Not Measured/Not Analyzed <br /> msl = Relative to mean sea level Y <br /> * The elevations of the top of die well casings have been surveyed ielative to Mean Sea Level <br /> i Laboratory reported iliat the hydrocarbons detected appeared to be a gasoline and non-gasoline mixture <br /> Laboratory reported that the hydrocarbons detected did not appear to be gasoline <br /> s Detection limit raised Refer to analytical results <br /> { MTBE by EPA Method 8260 <br /> s Laboratory report indicates unidentified hydrocarbons C6-C12 <br /> ANALYTICAL MffHODS <br /> EPA Method 8015 for TPH(G) <br /> EPA Method 8020 for BTEX and MTBE except where noted <br /> EPA Method 8260 for MTBE where noted <br /> I <br /> I <br /> As of 03/06198 <br /> 8 <br /> 2859 xis/1280054 <br />