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i <br /> Talftl <br /> Groundwater Monitoringand Analytical Results <br /> Tosco(Unocal) Service Station#6981 <br /> 4707 Pacific Avenue <br /> Stockton, California <br /> RXPLANATIONS. <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 On September 9, 1999,TOC elevations were re-surveyed based on City of Stockton Benchmark, <br /> a brass cap in monument well on the east side of Pacific Avenue approximately fifty feet south of 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 /> s 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 /> e MTBE by EPA Method 8260 <br /> 7 Field Blank <br /> 8 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 /> 11 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 /> 6981 x1s1#186138 17 As of 01/28/00 <br />