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i I <br /> WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 7910 Lower Sacramento Road <br /> Stockton, CA <br /> Wic #204-7524-0808 <br /> MTBE MTBEDepth to GW SPH <br /> Well ID Date TPPH B T X 8020 8260 TQC Water Elevation Thickness <br /> ug/L (ug/L) (uq/L) (u IL) (ug/L) (ug/L) (uq/L) (SD) ft ) (SD) (ft ) <br /> —MW-3(D) 11/10/1998 <50 <0 50 <0 50 <0 50 064 <2 5 NA 9893 NA NA NA <br /> MW-3 02/23/1999 <50 0 <0 500 <0 500 <0 500 108 726 NA 9893 3815 6078 NA <br /> MW-3 05/28/1999 <50 0 0 565 0 620 <0 500 167 793 121 9893 3281 6612 NA <br /> MW-3 08/27/1999 <50 0 <0 500 <0 500 <0 500 <0 500 607 NA 9893 3660 6233 NA <br /> MW-3 11/09/1999 1 <50 0 1 <0 500 1 <0 500 1 <0 500 1 <0 500 1 475 NA 9893 3650 6243 1 NA <br /> i <br /> MW-3 '_ 02102I000, <50(f 1 <{ 500. 2 fib 0 709 1 6 9t-, -32 7 36 7_ 98 93 32.7& 1d 66.15 . _ NA <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 /> ug/L=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 August 26, 1993 due to well head repairs <br /> b=Change in elevation of MW-1 on February 2,2000 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 /> Page 6 <br />