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! Ta i <br /> Groundwater Mot3ttat uig Va and Analytical Results <br /> Former Unocal Service Station#0187 <br /> 437 East Miner Avenue <br /> bi <br /> Stockton, California <br /> EXPLANATIONS <br /> Groundwater monitoring data and laboratory analytical results prior to March 9, 1998 were compiled from reports prepared by MPDS Services, Inc <br /> TOC = Top of Casing elevation B = Benzene <br /> DTW = Depth to Water I = Toluene ppb = farts per billion <br /> (ft) = Feet E = Ethylhenzene ND = Not Detected <br /> GWE = Groundwater Elevation X = Xylenes - = Not Me isuredlNot Analyzed <br /> TPH(G) = Total Petroleum hydrocarbons as Gasoline MTBE = Methyl [Litiary butyl ether <br /> r marked"IS-9" in monument box at San Joaquin <br /> * The elevations of the top of the well casings have been surveyed relative to benc,luna k 9 <br /> and Oak Streets (Elevation = 10 523 feet, City Datum) <br /> ** Groundwater elevation corrected due to the presence of frte product(correction tactor = 0 75) <br /> L Laboratory reported that the hydrocarbons detected appeared to be a gasoline and non gasoline mixture <br /> I Laboratory reported that the hydrocarbons detected did not appear to be gasoline <br /> 3 Laboratory has identified the presence of MTBE at a level above or equal to the tastt,and odor threshold of 40 ppin in the sample collected from this well <br /> 4 MTBE by EPA Method 8260 <br /> s Laboratory report indicates gas and unidentified hydrocarbons <C7 <br /> ANALYTICAL METHODS- <br /> EPA Method 8015 for TPII(G) <br /> EPA Method 8020 for BTEX and MTBE except where noted <br /> EPA Method 8260 for MTBE where noted <br /> I <br /> 0187 xis/#280045 6 As of 03109198 <br />