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Tab <br /> Groundwater Monitoring DIMnd Analytical Results <br /> Former Unocal Service Station#0187 <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 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 /> ms]=Mean sea level <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 /> ** GWE corrected due to the presence of free product,correction factor=[(DTW-TOC)+(Product Thickness x 0 75)] <br /> ' 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 /> 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 MTBE by EPA Method 8260 <br /> 5 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-C12 <br /> j 9 Well development <br /> 10 Laboratory report indicates gasoline C6-C12 <br /> ii Laboratory report indicates weathered gasoline C6-C12 <br /> 12 Detection limit raised Refer to analytical reports <br /> k3 Laboratory report indicates gasoline C6-C12+unidentified hydrocarbons<C6 <br /> i4 Laboratory report indicates gasoline C6-C12+unidentified hydrocarbons C6-C12 <br /> 15 Detection limit raised due to high levels of non-target compounds Refer to analytical reports <br /> 16 Sample collected from bottom of well using discrete bomb sampler at 114 feet <br /> 17 Sample collected from bottom of well using discrete bomb sampler at 69 feet <br /> is Well development not completed DTW only <br /> ANALYTICAL METHODS. <br /> i <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 xls/#280045 13 As of 09/01/00 <br />