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Groundwater Monitoring Data and Analytical Results <br /> el <br /> Tosco (Circle K)Unit#01205 <br /> 16470 Cambridge Street <br /> Lathrop, California <br /> EXPLANATIONS, <br /> Groundwater monitoring data and laboratory results prior to January 25, 1999, were compiled from reports prepared by Pacific Environmental Group,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 MeasuredlNot Analyzed <br /> GWE = Groundwater Elevation X = Xylenes <br /> TPH(G) = Total Petroleum Hydrocarbons as Gasoline MTBE = Methyl tertiary butyl ether <br /> * TOC elevations have been surveyed relative to the San Joaquin County Benchmark No W-34 <br /> i Laboratory report indicates gasoline and unidentified hydrocarbons C6-C12 <br /> z Detection limit raised Refer to analytical reports <br /> 3 MTBE by EPA Method 8260 <br /> 4 Laboratory report indicates gasoline and unidentified hydrocarbons >C10 <br /> 5 MTBE by EPA Method 8260 analyzed past hold time by 20 minutes <br /> 6 MTBE by EPA Method 8260 analyzed past hold time by 59 minutes <br /> 7 Laboratory report indicates gasoline C6-C12 <br /> 01205 xls/180183 3 As of 01/31/00 <br />