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tame i <br /> Groundwater Monitoring Data and Analytical Results <br /> Tosco(Unocal)Service Station#5886 <br /> 2701 West March Lane <br /> Stockton, California <br /> EXPLANATIONS <br /> Groundwater monitoring data and Iaboratory analytical results prior to March 25 1998, were compiled from reports prepared by MPDS Services,Inc <br /> TQC=Top of Casing B=Benzene (ppb)=Parts per billion <br /> DTW=Depth to Water T=Toluene -=Not Measured/Not Analyzed <br /> (ft)=Feet E=Ethylbenzene ND = Not Detected <br /> S I =Screen Interval X=Xylenes <br /> (ft bg ) <br /> s =Feet Below Ground Surface MTBE=Methyl tertiary butyl ether <br /> GWE=Groundwater Elevation <br /> (msl)=Mean sea level <br /> TPH-D=Total Petroleum Hydrocarbons as Diesel <br /> TPH-G=Total Petroleum Hydrocarbons as Gasoline I� <br /> * The TOC elevations were surveyed relative to msl These well casing elevations were used prior to the May 2, 1997 monitoring event <br /> The TOC elevations of the well casings were resurveyed(except for wells MW-2 and MW 3)relative w ve to msl on April 28, 1997 The well casingi elevationsare I' i <br /> used beginning with the May 2, 1997 The new TOC elevations for wells MW-2 and MW-3 were calculated by using the previously surveyed 4 <br /> elevations for wells MW-1,MW-2 and MW-3(MW-1 =-0 84 feet msl, MW-2=-0 30 feet msl,and MW 3=-0 14 feet msl)and the resurveyed <br /> elevation of well MW-1 (=-1 35 feet msl) <br /> ** Wells were re-surveyed on April 27, 1999 by Morrow Surveying TOC elevations are based on City of Stockton Benchmark#226,top of 3/4"iron pin <br /> in monument box at the intersection of the centerline of Feather River and the S R O W line of March Lane (Elevation=-0 92 feet) <br /> i Laboratory report indicates unidentified hydrocarbons unidentified hydrocarbons>C14 <br /> 2 Laboratory report indicates unidentified hydrocarbons unidentified hydrocarbons>C15 <br /> Laboratory report indicates unidentified hydrocarbons diesel and unidentified hydrocarbons>C20 <br /> ° Laboratory report indicates the hydrocarbons detected did not appear to be diesel <br /> ' <br /> Laboratory ort diesel diesel mixture <br /> re indicates the hydrocarbons detected appeared to be a iesenon iesemixrP Y II <br /> TPH-D analysis with silica gel cleanup { <br /> T MTBE by EPA Method 8260 <br /> a Detection limit raised Refer to analytical reports <br /> 9 Laboratory report indicates unidentified hydrocarbons C9-C24 <br /> I <br /> m Laboratory report indicates unidentified hydrocarbons C9-C24 and Discrete peak @ C24 <br /> Laboratory report indicates unidentified hydrocarbons C6-C12 <br /> 12 Laboratory report indicates unidentified hydrocarbons>C16 <br /> ii MTBE by EPA Method 8260 required reanalysis past hold time due to failing internal standard on first run First analysis was within hold time <br /> 14 Laboratory report indicates discrete peaks <br /> 5896 xls/#1 t4 i <br />