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To 1 <br /> WELL CONCENTRATIONS <br /> Shell Oil Products Company <br /> 141 N El Dorado Street <br /> Stockton,California <br /> WIC#214-7524-1509 <br /> Sample Measured Corrected SP TPPH B T E X MTBE Methanol dO dO Comments <br /> GW Depth GW Elev <br /> Date (ft) (ft) {#t) (ug (uglL) [uglL) (uglL) {ug1L) (uglL) mglL {mglL) Method <br /> 09-00-97 21 30 NA 0 00 <50 <0 50 <0 50 <0 50 <0 50 99 <1 0 1 8 YSI Meter All Oxygenate Compounds by 8260 ND except for MTBE 16 ppb <br /> 13-Jan-98 21 02__L NA 0 00 <50 <0 50 <0 50 <0 50 <0 50 41 <1 0 04 1 YSI MataF1 All Oxygenate Compounds by 8260 ND except for MTBE 25 ppb <br /> VEW-3 Top casing elevation (ft) N <br /> 05-Sep 96 2391 NA 000 <50 <0 50 <0 50 <0 50 <0 50 NA NA NA NA MTBE by 8260 4 0 ppb <br /> 25 Oct-96 2438 NA 000 <50 <0 50 <0 50 <0 50 <0 50 NA NA 42 YSI Meter MTBE by 8260 2 5 ppb <br /> 31-Jan-97 1967 NA 000 <50 <0 50 <0 50 <0 50 <0 50 (a) NA 34 YSI Meter <br /> 02-Apr 97 2129 NA 000 <50 <0 50 <0 50 <0 50 <0 50 (a) NA 31 YSI Meter EPA 8010 Detections <br /> 09-Jul 97 2141 NA 000 <50 <0 50 <0 50 <0 50 <0 50 42 NA 26 YSI Meter EPA 8010 Detections <br /> 09-Oct-97 2178 NA 000 <50 <0 50 <0 50 <0 50 <0 50 <25 <1 0 1 0 YSI Meter All Oxygenate Compounds by 8260 ND except for MTBE 4 0 ppb <br /> All Oxygenate Compounds by 8260 ND except for MTBE 6 4 ppb <br /> 13�Jan 98 21 56 NA 000 <50 25 15 081 36 89 <1 0 08 YSI Meter See Lab data for HVOCs <br /> VEW-4 Top casing elevation (ft) N <br /> 05 Sep 96 2327 NA 000 <50 <0 50 <0 50 <0 50 <0 50 <2 5 NA NA NA <br /> 25-Oct 96 2378 NA 000 <50 <0 50 <0 50 <0 50 <0 50 <2 5 NA 47 YSI Meter <br /> 31 Jan-97 1905 NA 000 <50 <0 50 <0 50 <0 50 <0 50 <2 5 NA 37 1 YSI Meter <br /> 02 Apr-97 2070 NA 000 <50 <0 50 <0 50 <0 50 <0 50 46 NA 25 YSI Meter <br /> 09-Jul-97 2060 NA 000 <50 <0 50 <0 50 <0 50 <0 50 10 NA 22 YSI Meter <br /> 09-0ct 97 2101 NA 0 00 <50 <0 50 <0 50 <0 54 <0 50 <2 5 <1 0 08 YSI Meter All Oxygenate Compounds by 8260 ND except for MTBE 2 1 ppb <br /> 13-Jan-98 2074 NA 000 <50 1 1 064 <0 50 20 26 <1 0 03 YSI Meter All Oxygenate Compounds by 8260 ND except for MTBE 3 7 ppb <br /> Abbreviations. <br /> NA=Not analyzed or not available <br /> <x=Not detected at detection limit of x <br /> (DUP)=Duplicate 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=Separate Phase hydrocarbon <br /> dO=dissolved Oxygen <br /> Notes <br /> '=MTBE could not be determined due to coelution with t 12 DCE <br /> (a)=MTBE could not be determined due to coetubng compounds <br /> 1 <br /> 2400821 7 <br />