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jA <br /> 02 Oct-oa <br /> EXPLANATION <br /> + Groundwater monitoring well <br /> Groundwater elevation contour in feet <br /> referenced to site datum Arrows indicate <br /> a \ / approximate groundwater flow direction <br /> 6238 Groundwater elevation in feet referenced <br /> \ to site datum <br /> W � \ <br /> (<0 500) Benzene concentration in ppb <br /> ``\ (<2 50) rn�BE(by EPA <br /> 1 Method 8020) <br /> o <br /> ci \ <x Not detected at detection limit x <br /> Aq <br /> \ Approximate hydraulic gradient=0 02 <br /> Dispenser Island <br /> (typ) \ <br /> Station <br /> f f Building <br /> U \ <br /> M -3 \ <br /> 6325 <br /> (<0 500) <br /> (41 s) , <br /> 63.3 <br /> Existing <br /> MW-2 <br /> 63 <br /> USTs 63 ♦4\63 35 <br /> (<0 500) <br /> (<2 50) <br /> O <br /> 627 Former UST <br /> Location <br /> \ <br /> 624 <br /> - ------------------ MW - -- —--—-- <br /> -- -- \ <br /> 62 3S <br /> (<2 510, -N– <br /> HAMMER LANE <br /> Scale FIGURE <br /> 0 15 30 60 <br /> 1 Inch=30 Feet 2 <br /> Base map from Fugro map of 6 Fcb 96 <br /> Shell-branded Service Station Groundwater Contour/ <br /> 7910 Lower Sacramento Road G Chemical Concentration Map <br /> Stockton, California <br /> Incident No 98996180 C A M B R I A <br /> August 1, 2000 <br />