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WELL CONCENTRATIONS Shell-branded Service Station 341 East Main Street Ripon, California Wic #204-6522-0307 MTBE MTBEI Depth to Depth to GW SPH DO Well ID Date TPPH TEPH B T E X 8020 8260 TOC Water SPH Elevation Thickness Reading (ug/L) (ug/L) Lug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (MSL) (ft) ft ) (MSL) ft ) ( m) MW-1 04/28=198 <100 NA <1 0 <1 0 <10 <1 0 92,000 150,000 NA 2532 NA NA NA 20 MW-1 07/28/1598 <50 NA <0 50 <0 50 <050 <0 50 5,200 160,000 NA 2700 NA NA NA 18 MW-1 10/07/1598 <1,000 NA <10 <10 <10 <10 130,000 130,000 NA 2736 NA NA NA 14 MW-1 11/10/1598 <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 <50 <5 0 <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 1 12/08/1998 <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 12/23/1998 <10,000 NA <100 <100 <100 <100 100,0001 69,000 NA 2742 NA NA NA 14 MW-1 1212911;M<50,OOO <500 <500 <500 <500 139,000 127,000 NA 2722 NA NA NA 12 MW-1 01/06/19 <0 500 <0 500 <0 500 <0 500 145 NA 2735 NA NA NA NA MW-1 01/14/19 <100 <100 <10 <100 88,100 86700`* NA2738 NA NA NA 17 MW-1 01/19/19 <500 <500 <500 <500 152,000 156,000 NA 27 31 NA NA NA 0 9 < U1 <25U 1_<zwQ 50.1133,00011 , Abbreviations TPPH=Total petrole um 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 Casinq Elevation SPH=Separate-Phase Hydrocarbons GW=Groundwater DO= Dissolved Oxygen ug/L= parts per billion ms]=Mean sea leve I ft=Feet <n=Below detection limit Pagel I