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WELL COIINTRATIONS • <br /> Shell-branded Service Station <br /> X41 Worth El Dorado <br /> Stockton, CA <br /> Wic 4204-7524-1509 <br /> MTBE MTBEDepth to GW SPH DO <br /> Well ID Date TPPH B T E X 8020 8260 TOC Water Elevation Thickness Reading <br /> ug/L u /L u /L u /L (Ug/ ug/L u IL MSL___]_ ft MSL ft m <br /> VEW-4 10/25/1996 <50 <0 50 <0 50 <0 50 <0 50 <2 5 NA NA 2378 NA 000 47 <br /> VEW-4 01/31/1997 <50 <0 50 <0 50 <0 50 <0 50 <2 5 NA NA 1905 NA 000 37 <br /> VEW-4 04/02/1997 <50 <0 50 <0 50 <0 50 <0 50 46 NA NA 2070 NA 000 25 <br /> VEW-4 07/09/1997 <50 <0 50 <0 50 <0 50 <0 50 10 NA NA 2060 NA 000 22 <br /> VEW-4 10/09/1997 <50 <0 50 <0 50 <0 50 <0 50 <2 5 21 NA 2101 NA 000 08 <br /> VEW-4 01/13/1998 <50 1 1 064 <0 50 20 26 37 NA 2074 NA 000 03 <br /> VEW-4 04/22/1998 <50 <0 50 <0 50 <0 50 <0 50 49 NA NA 1764 NA 000 043 <br /> VEW-4 07/28/1998 <50 <0 50 <0 50 <0 50 <0 50 20 NA NA 1659 NA 000 05 <br /> VEW-4 10/05/1998 <50 <0 50 <0 50 <0 50 <0 50 73 NA NA 1742 NA 000 53 <br /> VEW-4 01126!1999 <50 0 <0 500 <0 500 <0 500 <0 500 688 NA NA 18.10 NA 0.00 07 <br /> Abbreviations Notes <br /> TPPH=Total petroleum hydrocarbons as gasoline by modified EPA Method 8015 °-MTBE could not be determined due to coelution with t-1,2-DCE <br /> BTEX=benzene,toluene,ethylbenzene,xylenes by EPA Method 8020 (a)a MTBE could not be determined due to coeluting compounds <br /> MTBE n methyl-tertiary-butyl ether <br /> TOC-Top of Casing Elevation <br /> SPH a Separate-Phase Hydrocarbons <br /> GW-Groundwater <br /> DO=Dissolved Oxygen <br /> ugA_= parts per billion <br /> msl-Mean sea level <br /> ft-Feet <br /> <n-Below detection limit <br /> D= Duplicate sample <br /> Page 11 <br />