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TI <br /> Groundwater Monitor gl to 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 elevation 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 NA = Not Available <br /> TPH(G) = Total Petroleum Hydrocarbons as Gasoline MTBE = Methyl tertiary butyl ether <br /> * TOC elevations have been surveyed relative to the City of Stockton Datum <br /> Laboratory report indicates the hydrocarbons detected did not appear to be gasoline <br /> I z <br /> 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 /> ° Covered by a new sidewalk <br /> S The positive result for gasoline does not appear to have a typical gasoline pattern <br /> 6 MTBE by EPA Method 8260 <br /> Field Blank <br /> 8 Well was obstructed <br /> 9 Laboratory report indicates gasoline and unidentified hydrocarbons >C8 <br /> io Laboratory report indicates gasoline and unidentified hydrocarbons C6-C8 <br /> n Laboratory report indicates gasoline and unidentified hydrocarbons <C7 <br /> 12 Laboratory report indicates unidentified hydrocarbons >C7 <br /> I <br /> I <br /> 6981 x1s/1/180138 14 As of 01/26/99 <br />