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i � <br /> WELL COATRATIONS • <br /> Shell-branded Service Station <br /> 341 East Main Street <br /> Ripon,CA <br /> MTBE MTBE 1,2- Depth to Depth GW SPH DO <br /> Well ID Date TPPH TEPH B T E 1 X 81}20 8260 TBA DIPE ETSE TAME DCA EDB Ethanol Methanol TOC Water to SPH Elevation Thickness Reading <br /> uAL un u u u u1L) (u /L) (uIL) u u u u u /L) gu1L u u MSL ft ft MSL ft m <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarlans as gasoline by EPA Method 82648 pnor 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 ethyU nzene xylenes by EPA Method 8260B prior to July 10 2001 analyzed by EPA Method 8020 <br /> MTBE=Methyl terhary butyl ether <br /> DIPE=Di-isopropyl ether analyze d by EPA Method 8260B <br /> ETBE=Ethyl tertiary butyl ether analyzed by EPA Method 82608 <br /> TAME=Tertiary butyl methyl ether analyzed by EPA Method 826013 <br /> TBA=Tertiary butyl alcohol analyzed by EPA Method 82608 <br /> 1 2-DCA=1 2-Dichloroethane an atyzed by EPA Method 8260E <br /> EDB=Ethylene dibromide analyzed by EPA Method 82608 <br /> TOC=Top of Casing Elevation <br /> SPH=Separate-Phase Hydrocart ons <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=DO readings not taken for this event at wells MW-2 M%Ar-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 elevation altered during wellhead maintenance <br /> e=Hydrocarbon does nut match pattern of[aboratory s standard <br /> f=The concentration reported refl(icts individual or discrete unidentified peaks not matching a typical fuel pattern <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 welt MW-1 it advertently not run for July 9 1999 event <br /> Ethanol and Methanol analyzed by EPA Method 82608 <br /> Survey of wells performed on Marr h 25 1999 by Virgil Chavez Land Surveying of Vallejo CA <br /> Wells MW-4A,MW-4B,MW-5A M A-56 MW-SA and MW-66 surveyed on January 8,2000 by Virgil Chavez Land Surveying of Vallejo CA <br /> Revised survey data for wells EW-t 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 CA <br /> Page 11 <br />