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WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 7910 Lower Sacramento Road <br /> Stockton, CA <br /> Wic #204-7524-0808 <br /> MTBE MTBE Depth to GW SPH <br /> Well ID Date TPPH B T E X 8020 8260 TOC Water Elevation Thickness <br /> (ug/L) (ug/L) (ug,L) (ug/L) (ug/L) (ug/L) (ug/L) (SD) (ft) (SD) (ft) <br /> MW-3 05/28/1999 <50 0 0 565 1 0 620 1 <0 500 1 167 1 793 1 121 1 -9893 1 3281 1 6612 1 NA <br /> MW-3 08/2711yy99�9 <50 0 <0 500 1 <0 500 <0 500 <0 500 607 NA 9893 3660 6233 NA <br /> �.a`rTf01 <br /> rxe E E t x ' k "v"cy-e'we d+ v2 <br /> ¢ Hy <br /> a i <br /> I <br /> Abbreviations <br /> TPPH=Total petroleum hydrocarbons as gasoline by modified EPA Method 8015 <br /> BTEX=benzene,toluene,ethylbenzene,xylenes by EPA Method 8020 <br /> MTBE=methyl-tertiary-butyl ether <br /> TOC=Top of Casing Elevation <br /> SPH=Separate-Phase Hydrocarbons <br /> GW=Groundwater <br /> uglL=parts per billion <br /> sd=site datum <br /> ft=Feet <br /> <n=Below detection limit <br /> D=Duplicate sample <br /> NA=Not applicable <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 nnse water Equipment blank <br /> and laboratory method blank contained toluene(0 0007 and 0 00034, respectively)and xylenes(BDL and 0 00048, respectively) <br /> Page 6 <br />