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• Groundwater Montturmaland Analytical Results <br /> Former Unocal Service Station#0187 <br /> 437 East Miner Avenue <br /> Stockton,California <br /> EXPLANATIONS <br /> Groundwater monitoring data and laboratory analytical results prior to March 9,1998,were compiled from reports prepared by MPDS Services,Inc <br /> I <br /> TOC=Top of Casing TPH-G=Total Petroleum Hydrocarbons as Gasoline (ppb)=Parts per billion <br /> (ft)—Feet B=Benzene —=Not Measumd/Not Analyzed <br /> DTW=Depth to Water T=Toluene (D)=Duplicate <br /> S I =Screen Interval E=Ethylbenzene QA=Quality Assurance/Tnp 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 /> '• OWE corrected due to the presence of free product, correction factor [(DTW-TOC)+(Product Thickness x 0 75)] <br /> r Laboratory reported the hydrocarbons detected appeared to be a <br /> ppe gasoline and non-gasoline mixture <br /> 2 Laboratoryreported the hydrocarbons detected did not <br /> rep Y 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 /> ' Laboratory report indicates gas and unidentified hydrocarbons DC7 <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-C 12 <br /> 9 Well development performed <br /> 10 Laboratory report indicates gasoline C6-C 12 <br /> 11 Laboratoryreport indicates weathered <br /> po gasoline C6-C 12 <br /> 12 Detection limn raised Refer to analytical reports <br /> 13 Laboratoryreport indicates <br /> gasoline C6-C 12+unidentified hydrocarbons<C6 <br /> 14 Laboratory report indicates gasoline C6-C 12+unidentified hydrocarbons C&C 12 <br /> Is Detection Inuit 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 /> is Well development not completed DTW only <br /> 19 Sample collected at the top of water column using a disposable bailer <br /> I <br /> 0187 x1st#280045 1 As of 02/06/03 <br />