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i <br /> WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 341 East Main Street <br /> ' Ripon, CA <br /> I MTBE MTBE Depth to Depth GW SPH DO <br /> Well ID Date 1TPPH TEPH B T E X 8020 8260 TOC Water to SPH Elevation Thickness Reading <br /> a v IL u IL u IL u IL u IL u IL u IL u IL MSL ft ft MSL ft m <br /> Notes <br /> a=D O readings not taken for this event at wells MW-2, MW-3 and EW-2 <br /> b=MTBE by EPA 8020 not taken for this event <br /> c=No pont, unable to sample <br /> d=Top of Casing elevation altered during wellhead maintenance <br /> e=Hydrocarbon does not match pattern of laboratory's standard <br /> `MTBE by EPA Method 8260 omitted due to lab error <br /> Sample was analyzed past EPA recommended holding time <br /> MTBE by 8260 for well MW-1 inadvertently not run for July 9, 1999 event <br /> Survey of wells performed on March 25, 1999, by Virgil Chavez Land Surveying of Vallejo, CA <br /> i <br /> Wells MW4A, MW413, MW-5A, MW-513, MW-6A and MW-68 surveyed on January 8,2000 by Virgil Chavez Land Surveying of Vallejo, CA <br /> Revised survey data for wells EW-1 and EW-2 provided by Cambria Environmental Technology, Inc in January, 2001 <br /> Site surveyed May 7,2002, bey Virgil Chavez Land Surveying of Vallejo, California <br /> I <br /> I <br /> i <br /> I <br /> I <br /> I <br /> • PO4 <br />