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WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 341 East Main Street <br /> Ripon, CA <br /> MTBE MTBE Depth to Depth GW SPH DO <br /> Well ID Date TPPH TEPH B T E X 8020 8260 TOC Water to SPH Elevation Thickness Reading <br /> (ug/L u L u L uIL u IL (ug/L u !L (ug/L MSL ft. ft. MSL ft. m <br /> Abbreviations: <br /> TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 8260B; prior to July 10,2001,analyzed by EPA Method 8015. <br /> TEPH=Total petroleum hydrocarbons as diesel by modified EPA Method 8015. <br /> BTEX=Benzene,toluene,ethylbenzene,xylenes by EPA Method 82606; prior to July 10,2001,analyzed by EPA Method 8020. <br /> MTBE=Methyl-tertim-butyl ether <br /> TOC=Top of Casing 1_levation <br /> SPH=Separate-Phasa 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 Methcd 8260 omitted due to lab error. <br /> **Sample was analyzod 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-6B surveyed on January 8,2000 by Virgil Chavez Land Surveying of Vallejo,CA <br /> Revised survey data fc�r wells EW-1 and EW-2 provided by Cambria Environmental Technology, Inc, in January,2001. <br /> Site surveyed May 7,9D02,by Virgil Chavez Land Surveying of Vallejo,California. <br /> Page 11 <br />