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15-Dart-01 <br /> EXPLANATION <br /> Groundwater monitoring well <br /> Groundwater elevation contour in feet <br /> referenced to site datum Arrows indicate <br /> \ approximate groundwater flow direction <br /> 0 \ <br /> 6238 Groundwater elevation in feet referenced <br /> W \ to site datum <br /> (<0 500) Benzene concentration in parts per <br /> \ ,\ billion(ppb) <br /> ' \ (<2 50) MTBE concentration in ppb by EPA <br /> Q Method 8020 <br /> \ <x Not detected at detection limit x <br /> W <br /> Approximate hydraulic gradient=0 1 <br /> Dispenser Island <br /> (typ) <br /> Station <br /> Building <br /> MW-3 < \ <br /> 6433 <br /> (<O 500) <br /> (3r 0) o <br /> Existing o MW-2 <br /> USTs a \69 SQ <br /> 1, (<0 500) <br /> (<2 50) <br /> 1 _*A Former UST <br /> Location <br /> - -- ---- -- -- ----- <br /> MW-1� <br /> ---63.55-------------- <br /> {<2 50 -N- <br /> HAMMER LANE <br /> Scale <br /> FIGURE <br /> 0 15 30 60 2 <br /> N 1 Inch=30 Feet <br /> Sace map from Fugro map of 6 Feb 96 <br /> Shell-branded Service Station Groundwater Contour/ <br /> 7910 Lower Sacramento Road G Chemical Concentration Map <br /> Stockton, California <br /> C A M B R I A November 21, 2000 <br />