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Tel • <br /> Ground«ater Alonitoring Data and Analytical Results <br /> Former Unocal Service Station X10187 <br /> 437 East Miner Avenue <br /> Stockton, California <br /> EXPLANATIONS. <br /> Groundwater monitoring data and laboratory analytical results prior to March 9 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 -- = Not Measured/Not Analyzed <br /> (ft) = Feet E = Ethylbenzene (D) = Duplicate <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 Benchmark marked"IS-9" in monument box at San Joaquin <br /> and Oak Streets (Elevation = 10 523 feet, City Datum) Site re-surveyed on February 10, 1999 by Field Designs <br /> ** Groundwater elevation corrected due to the presence of free product, correction factor = ((DTW-TOC)+(Product Thickness x 0 75)] <br /> 1 Laboratory reported the hydrocarbons detected appeared to be a gasoline and non-gasoline mixture <br /> 2 Laboratory reported the hydrocarbons detected did not appear to be gasoline <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 MTBE by EPA Method 8260 <br /> S Laboratory report indicates gas and unidentified hydrocarbons <C7 <br /> 6 Laboratory report indicates discrete peak C6 <br /> 7 Laboratory report indicates unidentified hydrocarbons C6-C12 <br /> 8 Laboratory report indicates gasoline and unidentified hydrocarbons C6-C 12 <br /> 9 Well development only <br /> 10 Laboratory report indicates gasoline C6-C12 <br /> ANALYTICAL METHODS, <br /> EPA Method 8015 for TPH(G) <br /> EPA Method 8020 for BTEX and MTBE except where noted <br /> EPA Method 8260 for MTBE where noted <br /> 0187 xlsl#280045 9 As of 08/20/99 <br />