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WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 341 East Main Street <br /> Ripon, CA <br /> Wic #204-6522-0307 <br /> Depth <br /> MTBE MTBE 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 IL uIL (ug/L u IL uILu IL u ILMSL ft. ft. MSL ft, m <br /> Abbreviations: <br /> TPPH =Total petroleum hydrocarbons as gasoline by modified EPA Method 8015 <br /> TEPH =Total petroleum hydrocarbons as diesel by modified EPA Method 8015 <br /> BTEX= benzene,toluene, ethylbenzene,xylenes by EPA Method 8020 <br /> MTBE = methyl-tertiary-b.ityl ether <br /> TOC =Top of Casing Elevation <br /> SPH = Separate-Phase F,ydrocarbons <br /> GW=Groundwater <br /> DO= Dissolved Oxygen <br /> ug/L W 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 /> i - <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 E260 omitted due to lab error. <br /> Sample was analyzed past EPA recommended holding time. <br /> Survey of wells performed on March 25, 1999 by Virgil Chavez Land Surveying of Vallejo, CA. <br /> *** MTBE by 8260 for wel. MW-1 inadvertently not run for July 9, 1999 event. <br /> Wells MW-4A, MW-413, M,N-5A, MW-5B, MW-6A and MW-6B surveyed on January 8,2000 by Virgil Chavez Land Surveying of Vallejo, CA <br /> Page 7 <br /> I <br />