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WELL CONCENTRATIONS - <br /> Shell-branded Service Station <br /> 341 East Main Street <br /> Ripon, California <br /> Wic #204-6522-0307 <br /> MTBE MTBE Depth to Depth to GW SPH DO <br /> Well ID Date, TPPH TEPH B T E X 8020 8260 TOC Water SPH Elevation Thickness Reading <br /> (uglL) (uglL) (uglL) (u IL) (uglL) (uglL) (uglL) (uglL) (MSL) (ft) (ft) (MSL) (ft) (ppm) <br /> MW-1 04/28/1998 <100 NA <1 0 <1 0 <1 0 <1 0 92,000 150,000 NA 2532 NA NA NA 20 <br /> MW-1 07/28/1998 <50 NA <0 50 <0 50 <0 50 <050 5,200 160,000 NA 2700 NA NA NA 1 8 <br /> MW-1 1010711998 <1,000 NA <10 <10 <10 <10 130,000 130,000 NA 2736 NA NA NA 14 <br /> MW-1 11/10/1998 <50 NA <0 50 <0 50 <0 50 <0 50 210 NA NA 2715 NA NA NA 12 <br /> MW-1 11/18/1398 <500 NA I <5 0 <5 0 _<50 <50 3,300 NA NA 2711 NA NA NA 13 <br /> MW-1 11/24/1398 <10,000 NA <100 <100 <100 <100 130,000 130,000 NA 2727 NA NA NA 12 <br /> MW-1 12/01/1398 <50,000 NA <600 <500 <500 <500 138,000 155,000 NA 2700 NA NA NA 11 <br /> MW-1 12/08/1998 <10,000 NA <100 160 <100 <100 130,000 130,000 NA 2745 NA NA NA 13 <br /> MW-1 12/17/1998 <20,000 NA <200 <200 <200 <200 190,000 160,000 NA 2737 NA NA NA NA <br /> MW-1 12/23/1998 <10,000 NA <100 <100 <100 <100 100,000 69,000 NA 2742 NA NA NA 14 <br /> MW-1 12/29/1398 <50,000 NA <500 <500 <500 <500 139,000 127,000 NA 2722 NA NA NA 12 <br /> MW-1 01/06/1999 <50 0 NA <0 500 <0 500 <0 500 <0 500 145 NA 2735 NA NA NA NA <br /> MW-1 01/14/1999 <10000 NA <100 <100 <100 <100 88,100 86,700** NA 2738 NA NA NA 17 <br /> MW-1 01/19/1399 <50000 NA <500 <500 <500 <500 152,000 156,000 NA 2731 NA NA NA 09 <br /> MW-1 01/28/1999 <25000 NA <250 <250 <250 <250 133,000 149,000 NA 2734 NA NA NA 11 <br /> MW-1 02/02/1999 <50 NA <0 50 <0 50 <0 50 <0 50 85,000 92,000 NA 2776 NA NA NA 13 <br /> 02/1171 ZT-7 TOIW� < < <10 1180,0001 <br /> Abbreviations <br /> TPPH =Total petrolieum hydrocarbons as gasoline by modified EPA Method 8015 <br /> TEPH =Total petroleum hydrocarbons as diesel by modified EPA Method 8015 <br /> BTEX= benzene,toluene, ethylbenzene,xylenes by EPA Method 8020 <br /> MTBE=methyl-tertiary-butyl ether <br /> TOC=Top of Casing Elevation <br /> SPH=Separate-Ph ese Hydrocarbons <br /> GW= Groundwater <br /> DO= Dissolved Oxy gen <br /> ug/L=parts per billun <br /> ms]=Mean sea level <br /> ft= Feet <br /> <n = Below detection limit <br /> Pagel <br />