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TABLO •WELL CONCENTRATIONS <br /> Shell Oil Pi oducts Company <br /> 7910 Lower Sall amenfo Road <br /> Stockton, California <br /> WIC #204-7524-0808 <br /> Sample Measured Corrected SP TPPH B I T I E X MTBE Comments <br /> GW Depth GW Elev <br /> Date (ft) (ft) (ft) (ug/L) (ug/L) f (ug/L) , (ug/L) (ug/L) (ug/L) <br /> 05-Oct-95 NA NA NA <50 <0 5 <0 5 <0 5 <0 5 NA i <br /> 20-Aug-96 NA NA NA <50 <0 50 <0 50 <0 50 <0 50 19 MTBE by 8260 20 ppb <br /> 06-Feb-97 NA NA NA <50 <0 50 <0 50 <0 50 078 33 <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 j <br /> and laboratory method blank contained toluene(0 0007 and 0 00034, respectively)and xylenes (BDL and 0 00048, respectively) <br /> 97377 5 <br /> I <br />