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y WELL CONCENTRATIONS Shell-branded Service Station 341 East Main Street Ripon, California Wic #204-6522-0307 MTBE MTBE Depth to Depth to GW SPH DO Well ID Date TPPH TEPH B T E X 8020 8260 TOC Water SPH Elevation Thickness Reacting (uglL) (uglL} {uglL) (uglL) (uglL) (ug/L) (uglL) {ug/L) (MSL) ft (ft ) MSL) ft m , MW-1 04/28/1Z,198 <100 NA <1 0 <1 0 <1 0 <1 0 92,000 150,000 NA 2532 NA NA NA 20 MW-1 07128115198 <50 NA <0 50 <0 50 <0 50 <0 50 5,200 160,000 NA 2700 NA NA NA 18 MW-1 10/07/1098 <1,000 NA <10 <10 <10 <10 130,000 130,000 NA 2736 NA NA NA 14 MW-1 11110115198 <50 NA <0 50 <0 50 <0 50 <0 50 210 NA NA 2715 NA NA NA 12 MW-1 11/18/1598 <500 NA <50 <5 0 <50 <50 3,300 NA NA 2711 NA NA NA 13 MW-1 11124115198 <10,000 NA <100 <100 <100 <100 130,000 130,000 NA 2727 NA NA NA 12 MW-1 12101115198 <50,000 NA <500 <500 <500 <500 138,000 155,000 NA 2700 NA NA NA 11 MW-1 12108115198 <10,000 NA <100 160 <100 <100 130,000 130,000 NA 2745 NA NA NA 13 MW-1 12/17/1998 <20,000 NA <200 <200 <200 <200 190,000 160,000 NA 2737 NA NA NA NA MW-1 12123111198 <10,000 NA <100 <100 <100 <100 100,000 69,000 NA E2735 NA NA NA 14 MW-1 12/29/1998 <50,000 NA <500 <500 <500 <500 139,000 127,000 NA NA NA NA 12 MW-1 01106115199 <500 NA <0 500 <0 500 <0 500 <0 500 145 NA NA NA NA NA MW-1 01114M199 <10000 NA <100 <100 <100 <100 88,100 86,700"'* NA NA I NA NA 17 199 1 <50000 A I <500 <500 1 <5 52,w Abbreviations TPPH=Total petroleum hydrocarbons as gasoline by modified EPA Method 8015 TEPH=Total petrole um hydrocarbons as diesel by modified EPA Method 8015 BTEX=benzene,toluene,ethylbenzene,xylenes by EPA Method 8020 MTBE= methyl-teitUiry-butyl ether TOC=Top of Casing Elevation SPH=Separate-Phrse Hydrocarbons GW=Groundwater DO= Dissolved Oxygen ug/L= parts per billic n msl=Mean sea level ft=Feet <n=Below detection limit * MTBE by EPA Method 8260 was omitted due to lab error **Analysis run out of recommended hold time due to lab error Pagel