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OLE 1 <br /> WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 7910 Lower Sacramento Road <br /> Stockton,California <br /> WIC#204-7524-0808 <br /> Sample Measured Corrected SP TPPH BT E X MTBE Methanol Comments <br /> GW Depth GW E1ev <br /> Date (ft) (ft) (ft) (ug/l-) (ug/L) (ug1Q (ug/L) (uglL) (ug/L) mg/L <br /> MW-3(DUP) <br /> 19-Feb-93 NA NA NA <50 <0 5 <0 5 <0 5 <0 5 NA NA <br /> 26-Aug-93 NA NA NA <50 <0 5 <0 5 <0 5 <0 5 NA NA <br /> 15-Feb-94 NA NA NA <50 <0 5 <0 5 <0 5 <0 5 NA NA <br /> 16-Aug-94 NA NA NA <50 <0 5 <0 5 <0 5 <0 5 NA NA <br /> 05-Oct-95 NA NA NA <50 <0 5 <0 5 <0 5 <0 5 NA NA <br /> 20-Aug-96 NA NA NA <50 <0 50 <0 50 <0 50 <0 50 19 NA MTBE by 8260 20 ppb <br /> 06-Feb-97 NA NA NA <50 <0 50 <0 50 <0 50 078 33 NA <br /> Oxygenate Compound by 8260 ND except <br /> 21-Nov-97 NA NA NA <50 <0 50 <0 50 <0 50 16 99 <1 0 for MTBE 13 ppb <br /> 11-Feb-96 NA NA NA <50 1 071 096 <0 50 1 5 35 NA <br /> 21-May-98 NA NA NA <50 <0 50 <0 50 <0 50 15- 52 NA <br /> Abbreviations <br /> <x=Not detected at or above the detection limit as indicated <br /> NA=Not analyzed or not available <br /> (DUP)=Duplicate sample <br /> TPPH=Total Purgeable Petroleum Hydrocarbon carbon range C6 to C12 by EPA Method 8015(Modified) <br /> (previously reported as Total Petroleum Hydrocarbons as Gasoline) <br /> BTEX=benzene,toluene,ethylbenzene,xylenes by EPA Method 8020 <br /> MTBE=methyl-tertiary-butyl ether by EPA Method 8020 <br /> Notes <br /> a=Change in elevation of MW-2 on 08/26/93 due to well head repairs <br /> =Laboratory(NET,Inc)reported persistent toluene and xylene in laboratory supplied trip blanks and rinse water Equipment blank <br /> and laboratory method blank contained toluene(0 0007 and 0 00034,respectively)and xylenes(BDL and 0 00048,respectively) <br /> 240-08'2 5 <br />