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i <br /> • WELL CONCRTRATIONS • <br /> i <br /> Shell-branded Service Station <br /> 1267 Country Club <br /> Stockton, CA <br /> MTBE MTBEDepth to GW SPH <br /> Well ID Date TPPH TEPH B T E X 8020 8260 TOC Water Elevation Thickness <br /> (ug/L.) (u2/L) u IL u IL u IL u IL ug/L u IL MSL ft MSL ft <br /> Abbreviations <br /> TPPH =Total petroleum hydrocarbons as gasoline by EPA Method 82606, prior to January 29, 2001, analyzed by EPA Method 8015 <br /> TEPH =Total petroleum hydrocarbons as diesel by modified EPA Method 8015 <br /> BTEX= Benzene, toluene, ethylbenzene, xylenes by EPA Method 8260B, prior to January 29, 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 /> MSL= Mean sea level <br /> ft= Feet <br /> <n = Below detection limit <br /> (D) = Duplicate sample <br /> NA= Not applicable <br /> ND =Not detected at or above the minimum quantitation limits <br /> Notes <br /> MTBE by EPA method 8260 was run out of recommended hold time, value should be considered an estimate <br /> a =This sample was analyzed outside of EPA recommended hold time <br /> b=TEPH with Silica Gel cleanup <br /> c= Hydrocarbon reported does not match the pattern of the laboratory's standard <br /> Site surveyed January 7, 2002, by Virgil Chavez Land Surveying of Vallejo, California <br /> Page 7 <br />