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i TAW • WELL CONCENTRATIONS Shell Oil Products Company 141 N EI Dorado Street Stockton,California WIC#204-7524-1509 Sample Measured Corrected SP TPPH B T E X MTBE Methanol d0 d0 Comments GW Depth GW Elev Date (ft) (ft) (h) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) (ug/L) mg/L (mg/L) Method VEW-3 Top casing elevation (ft) 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 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 31-Jan-97 1967 NA 000 <50 <0 50 <0 50 <0 50 <0 50 (a) NA 34 YSI Meter 02-Apr-97 2129 NA 000 <50 <0 50 <0 50 <0 50 <0 50 (a) NA 31 YSI Meter EPA 8010 Detections 09 Jul 97 2141 NA 000 <50 <0 50 <0 50 <0 50 <0 50 42 NA 26 YSI Meter EPA B010 Detections 09-0ct-97 2178 NA 000 <50 <0 50 <0 50 <0 50 <0 50 <2 5 <1 0 1 0 YSI Meter All Oxygenate Compounds ND except for MTBE 4 0 ppb VEW-4 Top casing elevation (ft) 05-Sep-96 2327 NA 000 <50 <0 50 <0 50 <0 50 <0 50 <2 5 NA NA NA 25-Oct-96 2378 NA 000 <50 <0 50 <0 50 <0 50 <0 50 <2 5 NA 47 YSI Meter 31-Jan-97 1905 NA 000 <50 <0 50 <0 50 <0 50 <0 50 <2 5 NA 37 YSI Meter 02-Apr-97 2070 NA 000 <50 <0 50 <0 50_1 <0 50 <0 50 46 NA 25 YSI Meter 09-Jul-97 2060 NA 000 <50 <0 50 <0 50 1 <0 50 <0 50 10 NA 22 YSI Meier 09-Oct-97 2101 NA 0 00 <50 <0 50 <0 50 <0 50 t <0 50 1 <2 5 <1 0 08 1 YSi Meter All Oxygenate Compounds ND except for MTBE 2 1 ppb Abbreviations NA=Not analyzed or not available <x=Not detected at detection limit of x (DUP)=Duplicate sample TPPH=Total Purgeable Petroleum Hydrocarbons carbon range C6 to 012 by EPA Method 8015(Modified) (previously reported as Total Petroleum Hydrocarbons as Gasoline) BTEX=benzene,toluene,ethylbenzene and xylenes by EPA Method 8020 MTBE=methyl tertiary butyi ether by EPA Method 8020 SP=Separate Phase hydrocarbon dO=dissolved Oxygen Motes_ =MTBE could not be determined due to coelution with t 1,2-DCE (a)=MTBE could not be determined due to coelutmg compounds 169 7