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31-Jul-03 <br /> _ EXPLANATION <br /> HAMAWR LANE Groundwater monitoring well <br /> _ Iy Destroyed groundwater monitoring well <br /> -- ® Proposed groundwater monitoring well <br /> NIW-0 <br /> _ <br /> -3164 Groundwater elevation contour in feet <br /> ~(<O 50)----------------------------------- referenced to mean sea level(ftmsl) <br /> <0 50) 31� ` alt flow direction <br /> Arrows indicate approximate groundwater <br /> OT <br /> _T1 --(<0.50) -31.71 Groundwater elevation in ft msl <br /> (<O 50) <br /> J� -Former (<0.50) Benzene concentration 1n parts per <br /> Existin ` UST billion(ppb) <br /> - USTs Location MW-8 Wooded <br /> (<O 50) MTBE concentration 1n ppb <br /> field <br /> <x Not detected at reporting limit x <br /> rS mayy' ode �. <br /> Approximate hydraulic gradient=0 005 <br /> - MW-7 I MW-3 T T MW-2 1' ` N <br /> C -3147- 31.75 <br /> (fL5) (<0 50) <br /> - (5,300) (180) MW-9 <br /> Building <br /> Canopy and III W E <br /> yDispenser Islands <br /> ZI I MW-1 <br /> _ y , Domestic well <br /> ` 160 feet <br /> MW-6 S <br /> -3169 <br /> (<0.50) Waste Oil <br /> (<0 50) Tank <br /> I-------------- - --------- -_ _ --- ----------------------1 --N- <br /> FIGURE <br /> Scale(ft)LO <br /> 0 20 40 80 2 <br /> rn <br /> 0- <br /> Shelf-branded Service Station Groundwater Contour/Chemical <br /> 7700 Moreland Street © Concentration Map <br /> Stockton, California <br /> C A M B R I A June 30, 2003 <br />