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WELL CONCENTRATIONS <br /> Former Texaco Service Station <br /> 11 <br /> 440 W. Charter Way <br /> IIStockton, CA <br /> MTBE Depth W GW SPH <br /> Well ID Date TPPH B T E X M76E 8020 8260 TOC Water Elevatmn Thickness <br /> (ug/L) (ug/L) (ug/L) (uglL) (ug/L} (ug/L) (uglL) (MSL} (ft) {MSL} (ft ) <br /> it II <br /> MW-17 08/2211996 <50 1 10 <0 5 <0 5 <0 5 <30 NA 1074 2900 -1826 None <br /> MW-17 11/25/1996 <50 <0 5 080 062 530 <30 NA 1074 2890 -1816 None <br /> MW-17 02/24/1997 340 75 <0 5 16 11 <30 NA 1074 2593 -15 19 None <br /> MW-17 05/19/1997 64 <0 5 <0 5 <0 5 <0 5 <30 NA 1074 2515 -1441 None <br /> MW-17 08/21/1997 1 <50 <0 5 <0 5 <0 5 <0 5 <30 NA 1074 2577 -1503 None <br /> MW-17 11/18/1997 <50 <0 5 <0 5 <q 5 <0 5 <30 NA 1074 2665 -1591 None <br /> MW-17 02109/1998 <50 <0 5 <0 5 <0 5 <0 5 <30 NA 1074 2490 -14 16 None <br /> MW-17 05/21/1998 <50 <0 5 <0 5 <0 5 <0 5 <2 5 NA 1074 1987 -913 None <br /> MW-17 08/11/1998 <50 <0 5 <0 5 <05 <0 5 <2 5 NA 1074 2041 -967 None <br /> MW-17 11/09/1998 <50 <0 50 <0 50 <d 50 095 <2 5 NA 1074 2141 -1067 None <br /> MW-17 02/17/1999 <50 0 1 0 676 <0 500 <0i'500 <0 500 <2 00 NA 1074 21 48 -1074 None <br /> MW-17 05/2511999 <500 <5 0 <5 0 <5 0 <5 0 <25 NA 1074 2012 -938 None <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 /> msl= Mean sea level <br /> ft= Feet <br /> <n = Below detection limit <br /> Page 18 , <br />