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9-May-02 <br /> ROSE MARIE LANE <br /> Planter <br /> `\ MW-1 <br /> \ ------ Waste VSs 0 50 <br /> --- 57 <br /> Oiler <0 86 <br /> � W <br /> � -- o z <br /> Air& --- <br /> Water <br /> ms 's Existing USTs� *z-� <br /> ------------< <br /> Station <br /> Building Canopy and <br /> Dispenser <br /> MW-2 Islands Exxon <br /> -8 35 ' i Monitoring <br /> N c5 05 Well <br /> VEW 2 MW-4 <br /> -8 38- <br /> i- <br /> Vent Lines - - - - - - - -. NA <br /> - - - - - - - - - - - ,�` <br /> NA 04 <br /> ---- --- --- - ----- -- NA .-___-- <br /> Bate map from Fugro map of 12 Nov 92 VEW-1 ' <br /> , <br /> EXPLANATION -8 40 -8 45Ti♦ MW-3 <br /> -� Groundwater monitoring 5 -847 <br /> well c5 0 �0 5 <br /> + Vapor extraction well _ _ <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 /> (334) billion(ppb) <br /> MTBE concentrations in groundwater in ppb by <br /> EPA Method 8260 Scale(ft) <br /> NA Not available FIGURE <br /> <X Not detected at detection limit x 0 10 20 40 <br /> Approximate Hydraulic Gradient=0 002 1 2-1 <br /> Shell-branded (Independent) Groundwater Contour/ <br /> Service Station G Chemical Concentration Map <br /> 4445 Pershing Avenue <br /> Stockton, California C A M B R I A February 27, 2002 <br />