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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 Reading __(2g/LL (ug/L) (ug/L) ug/L) (ug/L) (uglL) (ug/L) (ug/L (MSL) (ft ) (ft ) (MSL) (ft } (p m) MW-1 04/2811998 <100 NA <1 0 <1 0 <1 0 <1 0 92,000 150,000 NA 2532 NA NA NA 20 MW-1 07128!1998 <50 NA <050 <0 50 <0 50 <0 50 5,200 160,000 NA 2700 NA NA NA 18 MW-1 10/07/1998 <1,000 NA <10 <10 <10 <10 130,000 130,000 NA 2736 NA NA NA 14 MW-1 11/10/1998 <50 NA <0 50 <0 50 <0 50 <0 50 210 NA NA 2715 NA NA NA 12 MW-1 11/18/1998 <500 NA <50 <50 <50 <50 3,300 NA NA 2711 NA NA NA 13 MW-1 11/24/1998 <10,000 NA <100 <100 <100 <100 130,000 130,000 NA 2727 NA NA NA 12 MW-1 12/01/1998 <50,000 NA <500 <500 <500 <500 138,000 155,000 NA 2700 NA NA NA 11 MW-1 12/08/1998 i <10,000i 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 12/23/1998 <10,000 NA <100 <100 <100 <100 100,000 69,000 NA 2742INA NA NA 14 MW-1 12/29/1998 <50,000 NA <5040 < <500 <500 <500 139,000 127,000 NA 2722 NA NA 12 MW-1 01/06/1999 <50 0 NA <0 j500 500 <0 500 <0 500 145 NA 2735 NA NA NA 4 < 0 <10.0 <100 <100 88, , 38 Abbreviations TPPH =Total petroleum hydrocarbons as gasoline by modified EPA Method 8015 TEPH=Total petroleum hydrocarbons as diesel by modified EPA Method 8015 BTEX=benzene,toluene,ethylbenzene,xylenes by EPA Method 8020 MTBE=methyl-tertiary-butyl ether TOC=Top of Casing Elevation SPH=Separate-Phase Hydrocarbons GW=Groundwater DO=Dissolved Oxygen ug/L=parts per billion 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