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WELL CONCENTRATIONS r <br /> Shell-branded Service Station <br /> X6131 Pacific Avenue ; <br /> � E <br /> Stockton, CA <br /> � I <br /> MTBE MTBE Depth to Dept to G SPH D <br /> Well [D Date TPPH B T E X 8020 8260 TOC Water SPH Elevation Thickness Reading <br /> u IL a IL u L Ug/L u /L u L u IL MSL ft f' ft MSL ft m <br /> i, I <br /> Notes 1; I - fh, <br /> "=Chromatogram pattern indicates an unidentified hydrocarbon' �# <br /> a=Analyzed outside of EPA recommended hold time 1} <br /> b=The TPPH values for these samples are primarily caused by the presence of chlonnated compounds I <br /> c=Survey date <br /> d= Based on historical data,the samples for MW-6 and MW-7 appear to have been switched I <br /> e=The reported value Is primarily due to the presence of Tetrachloroethene <br /> f=Top of casing elevation altered dunng wellhead maintenances L <br /> g= Hydrocarbon does not match pattern of,laboratory's standard <br /> Dissolved Oxygen readings given prior to well purging iI <br /> Site surveyed November 30, 2001, and September 20, 2002, by VirgdiChavez Land Surveying of Vallejo, California <br /> Top-of-casing measurements prior to December 7, 2001,are measured to arbitrary Site Datum <br /> m <br /> I „ I <br /> I <br /> I I <br /> li - <br /> ' I I - <br /> I <br /> - <br /> 5 I h <br /> , I � <br /> I , , <br /> Pa a 14 <br /> I II � <br />