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i WELL CONCENTRATIONS Shell-branded Service Station 341 East Main Street Ripon,CA MTBE MTBE 1,2- �I Depth to Depth GW SPH DO Well ID Date TPPH TEPH SLT E X 802D 8260 TBA DIPE ETBE TAM£ DCA EDB Ethanol Methanol TOC Water toSPH Elevation Thickness Readingu 1t. u 2 u u fL u u u u h u u u u fL >L u u MSL ft ft MSL ft m I Abbrevfatlans TPPH=Total petroleum hydrocarbons as gasoline by EPA Method 82609,prior to July 10,2001,analyzed by EPA Method 8015 TEPH=Total petroleum hydrocarbons as diesel by me dllled EPA Method 8015 STEX=Benzene,toluene,ethylbenzene,xylenes by EPA Method 8260B prior to July 10 2001 analyzed by EPA Method 8020 MTBE-Methyl tertiary butyl ether TBA A Tertiary butyl alcohol DIPE Oidsopropyl ether ETBE Ethyl tertiary butyl ether TAME=Tertiary butyl methyi ether 1,2-DCA a 12-Dichioroethane EDB-Ethylene dibromide TOC n Top of Casing Elevation i SPH=Separate-Phase Hydrocarbais GW=Groundwater DO a Dissolved Oxygen ugfl-a Parts per billion Ppm■Parts per million MSL a Mean sea level &a Feet m a Below detection Imit NA=Not applicable Notes a=DO readings not taken for this event at wells MW-2,MW-3,and EW-2 b a MTBE by EPA 8020 not taken for this event. c=No pat,unable to sample d.Top of Casing elevation altered during wellhead maintenance e a Hydrocarbon doss not match pattern of laboratory's standard "MTBE by FPA Method 8260 omitted due to tab error Semple was analyzed past EPA recon M--1W holding time MTBE by 8280 for well MW-1 Inadvertency not run for July B 1899 event. Survey of wells performed on March 25,1999,by Vlrgli Chavez Land Surveying of Vallejo CA Wslis MW-4A,MW-48 MW 5A,M1Ni59,Mv"A,and MW-6B surveyed on January 8 2000 by Virgil Chavez Land Surveying of Vallejo CA Revised survey data for wells EW-1 and EW-2 provided by Cambria Environmental;Technology Inc,In January,2001 $se surveyed May 7 2002 by Vlrgit Chavez Land Surveying of Vallejo CA