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rr rr r� �■r r r� r rr rr r� r■ ri rr rr rr rr r� r r <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= Ethy[benzene 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 /> 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-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 8260B. <br /> 5 Laboratory report indicates gas and unidentified hydrocarbons DC7. <br /> s Laboratory report indicates discrete peak C6. <br /> 7 Laboratory report indicates unidentified hydrocarbons C6-C12. <br /> B 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 /> 1S Well development not completed. DTW only. <br /> 06940-325 35 of 36 ENSR Corporation <br />