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02-Apr 01 <br /> ROSE MARIE LANE <br /> t \ <br /> Planter <br /> } MW-1 <br /> Waste 7 93 <br /> Oil <2 <br /> 500 <br /> \ Tank iso` <2 50 <br /> Air& ,7 <br /> Water Existing USTs <br /> Station <br /> 4-------------------------- <br /> Building -- --- <br /> N� MW-2* El Canopy and Exxon <br /> Mon<0 5 0-777 <br /> 0 Dispenser We]litonng <br /> Islands •` I <br /> <2 50 <br /> Vent Lines ----- -- ----------- - ---- - <br /> ------------� NA � � - MW-4 <br /> <0500 <br /> -7 79 <br /> <2 50 <0 500 <br /> Base map from FuLro map of 12 Nov 92 VEW-1 <2 50 <br /> NA <br /> EXPLANATION <0 500 <br /> Groundwater monitoring well <2 50 M 83 <br /> Vapor extraction well <0 500 <br /> Exxon monitoring well <2 50 <br /> ` - Groundwater elevation contour in feet referenced to Former UST <br /> 'V • mean sea level (ms]) Arrows indicate approximate Location <br /> .0e groundwater flow direction <br /> MW-2 Well designation <br /> -725 Groundwater elevation,ft msl <br /> <0 500`Benzene concentrations in groundwater in arts per <br /> (33 4) g p <br /> \billion (ppb) <br /> MTBE concentrations in groundwater in ppb by EPA <br /> Method 8020, results in parentheses are analyzed by <br /> EPA Method 8260 Scale (ft) <br /> FIGURE <br /> NA Not available FEM <br /> <X Not detected at detection limit x 0 10 20 40 <br /> Approximate Hydraulic Gradient=0 002 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 23, 2001 <br />