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4 <br /> TAP 2 <br /> WELL CONCENTRATIONS <br /> Shell Oil Products Company <br /> 141 N. El Dorado Street <br /> Stockton, California <br /> WIC #204-7524-1509 <br /> sample Measurpth e � <br /> d( ) Corrected SP TPPH B T E X MTBE dO d0 Comments <br /> Date GW De ft GW Elev (ft) (ft) i (ug/L) (ug/L) (uglL) (ug/L) 1 (ug/L) (ug/L) (mg/L) Method <br /> 31-Jan-97 1967 NA 000 <50 <0 50 <0 50 <0 50 <0 50 (a) 3 4 YSI Meter _ <br /> 02-Apr-97 2129 <br /> NA 0 <50 <0 50 <0 50 <0 50 <0 50 (a) 31 YSI Meter EPA BOi 0 Detections <br /> VEW-4 Top casing elevation (ft) <br /> 05-Sep-96 2327 NA 000 <50 <0 50 <0 50 <0 50 <0 50 <2 5 4 NA <br /> 25-Oct-96 2378 NA 000 <50 <0 50 <0 50 <0 50 <0 50 <2 5 4 7 YSI Meter <br /> 31-Jan-97 1905 NA 000 <50 <0 50 <0 50 <0 50 <0 50 <2 5 3 7 YSI Meter <br /> 02-Apr-97 2070 NA 0 00 <50 <0 50 1 <0 50 <0 50 1 <0 50 4 6 25 Y51 Meter <br /> Abbreviations <br /> NA= Not analyzed or not available <br /> <x= Not detected at detection limit of x <br /> (DUP) = DUpllcate sample <br /> TPPH =Total Purgeable Petroleum Hydrocarbons carbon range C6 to C12 by EPA Method 8015 (Modified) <br /> (previously reported as Total Petroleum Hydrocarbons as Gasoline) <br /> BTEX =benzene,toluene, ethylbenzene, and xylenes by EPA Method 8020 <br /> MTBE =methyl-tertiary-butyl ether by EPA Method 8020 <br /> SP = Separale Phase hydrocarbon <br /> d0 = dissolved Oxygen <br /> of <br /> MTBE could not be determined due to coeluhon with t 1,2 DCE <br /> (a) = MTBE could not be determined due to coelulmg compounds <br /> 8 <br /> 97369 <br />