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• A 4 <br /> Groundwater Monitoring fivand.Analytical Results • <br /> Tosco(Unocal)Service Station#6981 <br /> 4707 Pacific Avenue <br /> Stockton,California <br /> EXPLANATIONS <br /> Groundwater monitoring data and laboratory analytical results prior to March 5, 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 /> S I =Screen Interval X=Xylenes NA = Not Available <br /> (ft bgs)=Feet Below Ground Surface MTBE=Methyl tertiary butyl ether <br /> GWE=Groundwater Elevation <br /> (msl)=Mean sea level <br /> TPH-G=Total Petroleum Hydrocarbons as Gasoline <br /> * TOC elevations have been surveyed relative to the City of Stockton Datum On September 9, 1999,and on <br /> September 34,2000,TOC elevations were re-surveyed based on City of Stockton Benchmark,a brass cap in monument well on the east side <br /> of Pacific Avenue approximately fifty feet south of March Lane,(Elevation=1156)City of Stockton datum <br /> ' Laboratory report indicates the hydrocarbons detected did not appear to be gasoline <br /> 2 The analytical results of the groundwater samples collected from monitoring wells MW-8 through MW-13 on January 17 and 18, 1994,were <br /> inconsistent with the previous analytical results for these wells Therefore,MPDS Services,Inc resampled these wells on February 28, 1994 <br /> 3 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 /> 4 Covered by a new sidewalk <br /> 5 The positive result for gasoline does not appear to have a typical gasoline pattern <br /> 6 MTBE by EPA Method 8260 <br /> 7 Field Blank <br /> s Well was obstructed <br /> 9 Laboratory report indicates gasoline and unidentified hydrocarbons>C8 <br /> 10 Laboratory report indicates gasoline and unidentified hydrocarbons C6-C8 <br /> " Laboratory report indicates gasoline and unidentified hydrocarbons<C7 <br /> 12 Laboratory report indicates unidentified hydrocarbons>C7 <br /> 13 Laboratory report indicates gasoline C6-C12 <br /> 14 Laboratory report indicates weathered gasoline C6-C12 <br /> 's Laboratory report indicates discrete peaks <br /> '6 Laboratory report indicates unidentified hydrocarbons C6-02 <br /> 6981 xls/#180138 21 As of 12/27/00 <br />