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Ta* <br /> Groundwater Morutoring Data and Analytical Results <br /> Tosco(Unocal)Service Station#5994 <br /> 195 West Napa Street <br /> Sonoma,California <br /> EXPLANATIONS. <br /> Groundwater monitoring data and laboratory analytical results prior to June 22, 1998,were provided by MPDS Services,Inc <br /> TOC=Top of Casing B=Benzene (ppb)=Parts per billion <br /> DTW=Depth to Water T=Toluene (ppm)=Parts per million <br /> (ft)=Feet E=Ethylbenzene ND=Not Detected <br /> GWE=Groundwater Elevation X=Xylenes --=Not Measured/Not Analyzed <br /> ms1=Mean sea level MTBE=Methyl tertiary butyl ether <br /> TPH(G)=Total Petroleum Hydrocarbons as Gasoline <br /> * TOC elevations have been surveyed relative to mean sea level(insl)using the National Geodetic Survey Sea-Level Datum of 1929,per a USC&GS Benchmark located on <br /> the south wall of the Mission Hardware building(Elevation=84 89 feet msl) <br /> I Organic lead was ND <br /> 2 Total Oil&Grease(TOG)and all EPA Method 8010 compounds were ND <br /> 3 Organic lead was detected in well MW-2 at 3 0 ppb and in well MW-6 at 10 ppb <br /> 4 Laboratory report indicates the hydrocarbons detected did not appear to be gasoline <br /> S Laboratory report indicates the hydrocarbons detected appeared to be a gasoline and non-gasoline mixture <br /> 6 Laboratory report indicates the hydrocarbons detected appeared to be a diesel and non-diesel mixture <br /> 7 Laboratory report indicates the hydrocarbons detected did not appear to be diesel <br /> 8 The bottle containing the water sample was inadvertently broken in the laboratory <br /> 9 Laboratory report indicates unidentified hydrocarbons>C8 <br /> 10 Laboratory report indicates unidentified hydrocarbons>C14 <br /> ii MPDS reported GWE based on well cover elevation,GWE reported in table based on TOC elevation <br /> 12 Detection limit raised Refer to analytical results <br /> 13 Laboratory report indicates unidentified hydrocarbons>C15 <br /> 14 Laboratory report indicates unidentified hydrocarbons C6-C12 <br /> is Laboratory report indicates umdenufied hydrocarbons>C13 <br /> 16 Laboratory report indicates unidentified hydrocarbons>C16 <br /> 17 Laboratory report indicates unidentified hydrocarbons C9-C24 <br /> 19 MTBE by EPA Method 8260 <br /> 19 Laboratory report indicates Hydrocarbons pattern present in the requested fuel quantitation range but does not resemble the pattern of the requested fuel <br /> 20 Laboratory report indicates unidentified Hydrocarbons C 10-C24 <br /> 5994 als/#180134 10 As of 12/14100 <br />