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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-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 /> 4 MTBE by EPA Method 82606. <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-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 /> 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 /> 13 Well development not completed. DTW only. <br /> 06940-1 34 ENSR oration <br />