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07 Oct 02 <br /> EXPLANATION <br /> Groundwater monitoring well <br /> Q / Groundwater elevation contour in feet <br /> /y referenced to mean sea level(ft msl) <br /> Arrows indicate approximate <br /> groundwater flow direction <br /> \ <br /> -2116 Groundwater elevation in ft msl <br /> (<0 50) Benzene concentration in parts per billion <br /> (ppb) <br /> ` (c5 0) MTBE concentration in ppb by EPA <br /> Method 8260 <br /> coo <br /> \\ <x Not detected at detection limit x <br /> \ Approximate hydraulic gradient= 0 002 <br /> Dispenser Island \ <br /> (typ) . <br /> Station ` <br /> Building \ <br /> MW-3 <br /> -2615 <br /> <O 50 <br /> / <br /> (�0) -26 17 <br /> Existing \\(<0S0) <br /> USTs o #,(<5 0) <br /> Planter 26 j <br /> \ ` Former UST \ <br /> \ 2409 Location <br /> -2606 - - - <br /> (<0.50) <br /> (<5 0) —N— <br /> HAMMER LANE <br /> Scale(ft) <br /> FIGURE <br /> 0 15 30 60 2 II <br /> N <br /> Base map from Fvgm 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 August 8, 2002 <br />