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9-May-02 <br /> ROSE MARIE LANE <br /> \ Planter <br /> MW-1 <br /> \ ______, Waste -857SS �0 50 <br /> Oil <br /> , ----- Tank 086 <br /> W <br /> Air& W <br /> Water <br /> S_`----------- ---N ur <br /> *19� Existing USTs <br /> ------ <br /> ---------- -- --- Lei <br /> a <br /> Station �5t ------- <br /> � O <br /> Building - - L- - - - - - - - <br /> Canopy and <br /> Dispenser <br /> MW-2 ' Islands Exxon <br /> -835 Monitoring <br /> N- <br /> El <br /> <5 0 \� Well <br /> i <br /> ' VEW-2MW-4 <br /> - - - - - - - - _ ' <br /> - Vent Lines - - - - - - - -- NA `__ ` -8 - <br /> <0 5 5 <br /> NA <br /> - 0 <br /> Bast map fromFugromapofl2Nov 92 _____ NA --- -- $ � <br /> EXPLANATION VEW-1 <br /> -840 -845 MW-3 <br /> i Groundwater monitoring well <0 5 -847 <br /> 0 c0 5 <br /> Vapor extraction well <br /> - - - X50 <br /> Exxon monitoring well <br /> ` Groundwater elevation contour in feet referenced to Former UST <br /> Ymean sea level(msl) Arrows indicate approximate Location <br /> groundwater flow direction <br /> MW-2-----Well designation <br /> -7 25- —Groundwater elevation, ft msl <br /> <0 500-----Benzene concentrations in groundwater in parts per <br /> (33 4)\billion(ppb) <br /> MTBE concentrations in groundwater in ppb by <br /> EPA Method 8260 <br /> NA Not available Scale(ft) FIGURE <br /> OLL <br /> Not detected at reporting limit x 0 10 20 40 <br /> Approximate Hydraulic Gradient=0 002 1 2--.-1 <br /> Former Shell Service Station/ Groundwater Contour/ <br /> Pershing Oil Chemical Concentration Map <br /> 4445 N Pershing Avenue <br /> Stockton, California C A M B R I A February 27, 2002 <br />