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I <br /> EXPLANATION <br /> - <br /> HAMMER LANE + Groundwater monitoring well <br /> � - <br /> 0 Destroyed groundwater monitoring well <br /> ® Proposed groundwater monitoring well <br /> MW-4 ® <br /> -33 08 Product dispenser number <br /> - <br /> (<0 50,30-Jun-03)---—--`--—-- --—--—--—--—--—--—--—--— Groundwater elevation contour in feet <br /> (<0 50)l MW-5 referenced to mean sea level(ft ms]) <br /> _____13307 Arrows indicate approximate groundwater <br /> (<0 50,30-Jun-03) flow direction <br /> 33 06 L f Former (<0 50) <br /> ! UST I •3171 Groundwater elevation in ft msl <br /> 1 <br /> Location Wooded <br /> MW-8 field (<0 50,30-Jun-03) Benzene concentration in parts per <br /> / ' ' 1; <br /> Existing'f � billion(ppb),date last sampled <br /> USTS f lr d< <br /> Oe (<0 50) MTBE concentration in ppb <br /> - - MW-7 x-33 08�, <x Not detected at reporting limit x <br /> (<0 50,30-Jun-03) <br /> ® 8 © ® (34) Approximate hydraulic gradient=0 001 to 0 002 <br /> MW-3 MW-9 <br /> .33011 1 N <br /> (d5,30-Jun-03) Building <br /> MW-1 Canopy and 1 <br /> Dispenser Islands <br /> � ' I <br /> -N- W E <br /> MW-6 <br /> -3313 1 Domestic well <br /> - (<0 50,30-Jun-03) <br /> (<0 50) Waste Oil 160 feet <br /> Tank <br /> S <br /> Scale(h) FIGURE <br /> 0 20 Off 80 <br /> 2 <br /> Shell-branded Service Station <br /> 7700 Moreland Street Groundwater Contour/ <br /> Stockton, California G Chemical Concentration Map <br /> C A M B R I A <br /> - March 3, 2004 <br />