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i <br />' 1 <br /> 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 !D Date ' TPPH TEPH B T E X 8020 8260 TOC Water to SPH Elevation Thickness Reading <br /> ii u L u IL u IL u L u L u IL u IL u /L MSL ft. �I ft. MSL ft. rn <br /> 1 I <br /> Abbreviations: l <br /> . j <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 8260B;.pdor 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 f <br /> DO=Dissolved Oxygen a <br /> ug/L=Parts per billion <br /> ppm=Parts per million <br /> MSL=Mean sea level j <br /> ft=Feet j <br /> <n=Below detection limit + <br /> NA=Not applicable <br /> .I <br /> Notes; <br /> a=D.O. readings not taken Jfor 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 /> d=Top of Casing elevationialtered during-wellhead maintenance. <br /> "MTBE by EPA Method 8260 omitted due to lab error. <br /> "Sample was analyzed pa it 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-56; MW-6A and MW-613 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,by Virgil Chavez Land Surveying of Vallejo,California. - <br /> � P>.12 • <br />