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i <br /> WELL CONtNTRATIONS <br /> Shell-branded Service Station <br /> 341 East Main Street <br /> Ripon, CA <br /> Wic #204-6522-0307 <br /> MTBE MTBE Depth to Depth GW SPH DO <br /> Well ID Date TPPH TEPH B T E X 8020 8280 TOC Water to SPH Elevation Thickness Reading <br /> u /L (ug/L (Ug/L (ug/L (ug/L (u,/L (ug/L (ug/L MSL ft. ft. MSL ft. m <br /> Abbreviations: <br /> TPPH=Total petroleurn hydrocarbons as gasoline by EPA Method 82608; prior to July 10, 2001, analyzed by EPA Method 8015. <br /> TEPH =Total petroleurn hydrocarbons as diesel by modified EPA Method 8015 <br /> BTEX=benzene, toluene, ethylbenzene, xylenes by EPA Method 826013; prior to July 10, 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 /> DO= Dissolved Oxygen <br /> ug/L=parts per billion <br /> ppm=parts per million <br /> msl=Mean sea level <br /> ft=Feet <br /> <n=Below detection limit <br /> NA= Not applicable <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 port, unable to sample. <br /> *MTBE by EPA Method 8260 omitted due to lab error. <br /> **Sample was analyze 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 /> Wells MW-4A, MW-4B, MW-5A, MW-5B, MW-6A and MW-613 surveyed on January 8, 2000 by Virgil Chavez Land Surveying of Vallejo, CA <br /> Revised survey data ft-wells EW-1 and EW-2 provided by Cambria Environmental Technology, Inc. in January, 2001. <br /> Page 9 <br />