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Groundwater Monitoring Data and Analytical Results <br /> Former Unocal Service Station#5098 <br /> 5606 Pacific Avenue <br /> Stockton, California <br /> EXPLANATIONS. <br /> Groundwater monitoring data and laboratory analytical results prior to September 15, 1998, were compiled from reports prepared by MPDS Services, Inc <br /> TOC = Top of Casing B = Benzene ppb = Parts per billion <br /> DTW = Depth to Water T = Toluene ND = Not Detected <br /> (ft) = Feet E = Ethylbenzene - = Not Measured/Not Analyzed <br /> GWE = Groundwater Elevation X = Xylenes <br /> msl = Relative to mean sea level MTBE = Methyl tertiary butyl ether <br /> TPH(G) = Total Petroleum Hydrocarbons as Gasoline 1,2-DCE = 1,2-Dichloroethene <br /> * TOC elevations have been surveyed relative to mean sea level (msl)per the City of Stockton Benchmark No 14(Elevation = 10 95 feet msl) Prior to June 28, 1993, the DTW <br /> measurements were taken from the top of well covers <br /> i Well has been destroyed <br /> 2 Nitrates were ND, and coliform bacteria were below detection limits <br /> 3 All EPA Method 8010 constituents were ND, except for concentrations of bromodichloromethane at 0 53 ppb, chloroform at 14 ppb,and <br /> dibromochloromethane at 0 97 ppb <br /> 4 Laboratory has potentially identified the presence of MTBE at reportable levels in the groundwater sample collected from this well <br /> 5 Laboratory has identified the presence of MTBE at a level above or equal to the taste and odor threshold of 40 ppb in the sample collected from this well <br /> I 6 <br /> Laboratory report indicates the hydrocarbons detected appeared to be a gasoline and non-gasoline mixture <br /> 7 MTBE by EPA Method 8260 <br /> 8 Detection limit raised Refer to analytical results <br /> v All EPA Method 8010 Constituents were ND <br /> io Laboratory report indicates unidentified hydrocarbons C6-C8 <br /> ii Sampled by Environmental Audit, Inc <br /> 5098 x1s1#280046 6 As of 12/22/98 <br />