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Table 1 <br /> Groundwater Monitoring Data and Analytical Results <br /> Tosco (Unocal) Service Station#6981 <br /> 4707 Pacific Avenue <br /> Stockton, California p <br /> EXPLANATIONS, <br /> Groundwater monitoring data and laboratory analytical results prior to March 5 1998, were compiled front 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 Availabie <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 /> t Laboratory report indicates the hydrocarbons detected did not appear to be gasoline i <br /> Z The analytical results of the groundwater samples collected from monitoring wells MW-8 through MW-13 on January 17 and 18, 1994, were inconsistent withtheprevious <br /> analytical results for these wells Therefore, MPDS Services, Inc resampled these wells on February 28, 1994 <br /> II <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 <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 /> II <br /> 9 Laboratory report indicates gasoline and unidentified hydrocarbons >C8 <br /> 10 Laboratory report indicates gasoline and unidentified hydrocarbons C6-C8 <br /> ti Laboratory report indicates gasoline and unidentified hydrocarbons <C7 <br /> 12 Laboratory report indicates unidentified hydrocarbons >C7 <br /> u <br /> 'i <br /> I <br /> 0 <br /> i <br /> I� <br /> i <br /> 6981 x1s1V8 1.0 As of 099 <br />