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W MIM <br /> Table 1 <br /> Groundwater Monitoring Data and Analytical Results <br /> Former Unocal Service Station No. 0187 <br /> 437 East Miner Avenue <br /> Stockton, California <br /> EXPLANATIONS: <br /> Groundwater monitoring data and laboratory analytical results prior to November 29,2003,were compiled from reports prepared by Gettler-Ryan, Inc. <br /> TOC=Top of Casing TPHg=Total Petroleum Hydrocarbons as Gasoline (ug/L)=micrograms per liter <br /> (ft.)= Feet B= Benzene --= Not Measured/Not Analyzed <br /> DTW=Depth to Water T=Toluene (D)= Duplicate <br /> S.I.=Screen Interval E=Ethylbenzene QA=Quality Assurance/Trip Blank <br /> (ft. bgs)= Feet Below Ground Surface X=Xylenes <br /> GWE=Groundwater Elevation MtBE= Methyl tertiary butyl ether <br /> (msl)= Mean sea level <br /> * TOC 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-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 /> 5Laboratory report indicates gas and unidentified hydrocarbons<C7. <br /> s <br /> 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 /> t0 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-C12+unidentified hydrocarbons<C6. <br /> 14 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 /> is 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 oniy. <br /> 06940-325 1 ENSR Corporation <br />