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10 Table • <br /> Groundwater Monitoring Data and Analytical Results <br /> Former Unocal Service Station#0187 <br /> 437 East Miner Avenue <br /> Stockton,California <br /> EXPLADIATIONS. <br /> Groundwater monitoring data and laboratory analytical results prior to March 9, 1998,were compiled from reports prepared by MPDS Services,Inc <br /> j 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 /> i <br /> S I =Screen Interval X=Xylenes <br /> (ft bgs)=Feet Below Ground Surface MTBE=Methyl tertiary butyl ether <br /> GWE=Groundwater Elevation <br /> (ms1)=Mean sea level <br /> TPH-G=Total Petroleum hydrocarbons as Gasoline <br /> * TQC elevations have been surveyed relative to Benchmark marked"IS-9"in monument box at San Joaquin and Oak Streets,(Elevation= 10 523 feet,msl) <br /> Site re-surveyed on February 10, 1999 by Field Designs TOC elevations were surveyed on November 16,2000,by Virgil Chavez Land Surveying using <br /> the previous Benchmark <br /> ** GWE corrected due to the presence of free product, correction factor [(DTW-TQC)+(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 /> 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 /> 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 /> 9 Well development performed <br /> 10 Laboratory report indicates gasoline C6-C12 <br /> 11 Laboratory report indicates weathered gasoline C6-C12 <br /> 12 Detection limit raised Refer to analytical reports <br /> 13 Laboratory report indicates gasoline C6-C 12+unidentified hydrocarbons<C6 <br /> 14 Laboratory report indicates gasoline C6-C12+unidentified hydrocarbons C6-C12 <br /> is 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 /> ki Sample collected ftom bottom of well using discrete bomb sampler at 69 feet <br /> 1s Well development not completed DTW only <br /> 0187 xis/#280045 I As of 05/16/01 <br />