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i <br /> WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 16131 Pacific Avenue <br /> Stockton, CA <br /> MTSE MTBE Depth to Depth to I GW SPHD <br /> Well ID Date TPPH B T E I1 �XQ <br /> 8020 8260 TOC Water SPH Elevation Thickness Reading <br /> u L u L u u L u u L u /L MSL ft I ft t MSL ftm <br /> I P <br /> Notes <br /> `=Chromatogram pattern indicates an unidentified hydrocarbori <br /> a=Analyzed outside'of EPA recommended hold time i' 1 <br /> b=The TPPH values for these samples are primarily caused by',t a presence of chlorinated compounds C <br /> c=Survey date I° II <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 pnmarily due to the presence of Tetrachiorosthene I ` <br /> Dissolved Oxygen readings given prior to well purging 1 <br /> Site surveyed November 30,2001,and September 20,2002, by Virgil lChav�ex Land Surveying of Vallejo,California �r <br /> Top-of-casing measurements prior to December 7, 2001,are measured to arbitrary Site Datum _ <br /> t <br /> I I �- <br /> 1{ <br /> I' I <br /> rr <br /> I i <br /> i <br /> i 4 <br /> I I <br /> ' I - <br /> �I P e 12 <br /> l <br />