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Table 1 <br /> Groundwater Monitoring Data and Analytical Results <br /> Fortner 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 AssurancelTrip 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 /> 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 /> 5 Laboratory report indicates gas and unidentified hydrocarbons <C7. <br /> 6 Laboratory report indicates discrete peak C6. <br /> ' 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 /> S8 Well development not completed. DTW only. <br /> 06940 �5 ENSFOoration <br /> r � � 111• r r� � � � � �r r � � � � �■■ � <br />