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I <br /> WELL CONCENTRATIONS <br /> Shell-branded Service Station <br /> 620 West Charter Way <br /> Stockton, CA <br /> Wic #204-7524-4305 <br /> I <br /> MTBE MTBE Depth to GW SPH DO <br /> Well ID Date TPPH B T EX 8020 8260 TOC Water Elevation Thickness Reading <br /> u IL u IL u 1L u IL u IL u IL u 1l MSL ft MSL ft m <br /> MW-10 11/25/1996 <50 <0 5 <0 5 <0 5 [ <0 5 <10 NA 8837 2566 16271 000 24 <br /> MW-10 02/24/1997 <50 <0 5 <0 5 <0 5 <0 5 <10 NA 8837 2197 116640 000 14 <br /> MW-10 05/19/1997 <50 <0 5 <0 5 <0 5 [[ <0 5 <10 NA 8837 2179 116658 000 44 <br /> MW-10 08/21/1997 <50 <0 5 <0 5 <0 5 [[ <0 5 <10 NA 8837 2270 116,567 000 14 <br /> MW-10 11/17/1997 <50 <0 50 <0 50 <0 50 <0 50 NA 210 8837 2376 116461 000 34 <br /> MWA 0 02/09/1998 51 13 60 087 28 <3 NA 8837 21 05 1167 32 000 30 <br /> MW-10 05/21/1998 <50 <0 50 <0 50 <0 50 [[ <0 50 <2 5 NA 8837 1730 3171 07 000 26 <br /> MW-10 08/11/1998 <50 <0 50 <0 50 <0 50 J] <0 50 <2 5 NA 8837 1752 �170 85 000 18 j <br /> MW-10 11/09/1998 <50 39 1 2 0 98 [ 0 56 5 3 NA 88 37 1865 [169 72 000 23 <br /> MW-10 02/17/1999 <50 <0 50 <0 50 <0 50 [[ <0 50 <2 5 NA 8837 " �� NA 000 " <br /> MW-10 05/25/1999 <50 0 <0 500 <0 500 <0 500 [[ <0 500 <5 00 NA 8837 1802 170 35 000 19 <br /> MW=10r' 08118!1999 ;<50 0,'r <0 5008 <0 5a0 <0 500 �F <0t500s ,<5 00 NA 88 37, e 118 43_, t 1169 94 <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 /> DO= Dissolved Oxygen <br /> ug/L=parts per billion <br /> msl= Mean sea level <br /> ft= Feet <br /> <n= Below detection limit <br /> D=Duplicate sample <br /> NA= Not applicable <br /> Page 16 <br />