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' Ta <br /> SGroundwater Monitoring and 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 /> TPH(G)=Total Petroleum Hydrocarbons as Gasoline <br /> * TOC elevations have been surveyed relative to the City of Stockton Datum On September 9,1999,TOC elevations were re-surveyed based on <br /> City of Stockton Benchmark,a brass cap in monument well on the east side of Pacific Avenue approximately fifty feet south of <br /> March Lane,(Elevation=11 56)City of Stockton datum <br /> I 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 inconsistent with the previous <br /> 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 patter <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 /> E0 Laboratory report indicates gasoline and unidentified hydrocarbons C6-C8 <br /> i' Laboratory report indicates gasoline and umdentified hydrocarbons<C7 <br /> 1 <br /> 2 Laboratory report indicates unidentified hydrocarbons>C7 <br /> 13 Laboratory report indicates gasoline C6-C12 <br /> 14 Laboratory report indicates weathered gasoline C6-C12 <br /> 6981 xlst#180138 18 As of 06!27100 <br />