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i <br /> r i • <br /> WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 7910 Lower Sacramento Road <br /> Stockton, CA <br /> Wic #204-7524-0808 <br /> MTBE MTBE Depth to GW SPH <br /> Well ID Date TPPH B T E X 8020 8260 TOC Water Elevation Thickness <br /> ulL) (u /L) (uIL uIL uIL uIL uI SD ft SD ft <br /> Abbreviations <br /> TPPH =Total petroleum hydrocarbons as gasoline by modified EPA Method 82608, prior to May 11,2001 analyzed by EPA Method 8015 <br /> BTEX= benzene,toluene,ethylbenzene, xylenes by EPA Method 8260B, prior to May 11, 2001, analyzed by EPA Method 8020 <br /> MTBE=methyl-tertiary-butyl ether <br /> TOC=Top of Casing Elevation <br /> SPH= Separate-Phase Hydrocarbons <br /> GW=Groundwater <br /> ug/L= parts per billion <br /> sd= site datum <br /> ft= Feet <br /> <n= Below detection limit <br /> D= Duplicate sample <br /> NA= Not applicable <br /> Notes <br /> a=Change in elevation of MW-2 on August 26, 1993 due to well head repairs <br /> b= Change in elevation of MW-1 on February 2,2000 due to well head repairs <br /> c=Concentration reported is an estimate value above the linear quantitation <br /> d =This sample analyzed outside of EPA recommended hold time <br /> = Laboratory(NET, Inc)reported persistent toluene and xylene in laboratory supplied trip blanks and rinse water Equipment blank <br /> and laboratory method blank contained toluene(0 0007 and 0 00034, respectively)and xylenes (BDL and 0 00048, respectively) <br /> I <br /> Page 7 <br />