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02 Oct 01 <br /> EXPLANATION <br /> Groundwater monitoring well <br /> Q Groundwater elevation contour in feet <br /> O referenced to site datum Arrows indicate <br /> �. approximate groundwater flow direction <br /> 0 61.14 Groundwater elevation in feet referenced <br /> to site datum <br /> (2.1) Benzene concentration in parts per billion <br /> (Ppb) <br /> (20) MTBE concentration in ppb by EPA <br /> Method 8260 <br /> <x Not detected at detection limit x <br /> \ Approximate hydraulic gradient=0 02 <br /> a° Dispenser Island \ <br /> (typ) . <br /> Station <br /> Building \ <br /> • MW_Q <br /> 6114 <br /> (0 54) MW-2 <br /> (20) \ 6109 <br /> Existing 2.1 <br /> USTs o <br /> � `(�0) <br /> I I I i t I <br /> 0 �60& <br /> Planter <br /> °s <br /> \ J Former UST ` <br /> Location <br /> _6026— <br /> (20) _E� <br /> (<5 0)--.. -N- <br /> HAMMER LANE <br /> Scale(lt) <br /> FIGURE <br /> 0 15 30 60 <br /> c'jj <br /> Base mop from Fugro map of 6-Feb-96 <br /> Shell-branded Service Station Groundwater Contour/ <br /> 7910 Lower Sacramento Road Chemical Concentration Map <br /> Stockton, California <br /> C A M B R I A August 30, 2001 <br />