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L <br /> WELL COMENTRATIONS <br /> Shell-branded Service Station <br /> 6131 Pacific Avenue <br /> Stockton, CA <br /> MTBE MTSE Depth to Depth to GW SPHDO <br /> Well ID Date TPPH B T E X 8020 8260 TOC Water SPH Elevation Thickness Reading <br /> u IL u /L (ug/L (ug/L (ug/L (ug/L (ug/L MSL ftft MSL ft m <br /> Notes <br /> "=Chromatogram pattern indicates an unidentified hydrocarbon <br /> a=Analyzed outside of EPA recommended hold time <br /> b=The TPPH values for these samples are primarily caused by the presence of chlorinated compounds <br /> c=Survey date <br /> d= Based on historical data,the samples for MW-6 and MW-7 appear to have been switched <br /> e=The reported value is primarily due to the presence of Tetrachloroethene <br /> f=Top of casing elevation altered during wellhead maintenance <br /> g= Hydrocarbons reported as TPPH do not exhibit a typical Gasoline chromatographic pattern <br /> Dissolved Oxygen readings given prior to well purging <br /> Site surveyed November 30, 2001, and September 20, 2002, by Virgil Chavez Land Surveying of Vallejo, California <br /> Top-of-casing measurements prior to December 7, 2001,are measured to arbitrary Site Datum <br /> I <br /> Page 13 <br />