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10 Feb-04 <br /> Naw low <br /> EXPLANATION <br /> Groundwater monitoring well <br /> _ HAMMER LANE <br /> 0 Destroyed groundwater monitoring well <br /> ® Proposed groundwater monitoring well <br /> MW4 Groundwater elevation contour in feet <br /> -33.46 _ _r;, _ _ _ _ referenced to mean sea level(ft ms]) <br /> (<0 <O —50)/— 3) A MW-5 — \ Arrows indicate approximate groundwater <br /> flow direction <br /> ( _-33.50 <br /> _T7 (<0 50,30-Jun-03) .31 71 Groundwater elevation in ft msl <br /> � ,Former (0 59) (<0 50,30-Jun-03) Benzene concentration in parts per <br /> MW-3USTU11 billion b date last led <br /> `. f' Wooded (ppb), sampled <br /> MW-8(<25,30-Jun-03) <br /> field (<0 50) MTBE concentration in ppb <br /> (3 0) Existing <br /> <x Not detected at reporting limit x <br /> i <br /> �—MW-2 <br /> MW-7 a5 _-33.44Approximate hydraulic gradient= 0 0005 to 0 0008 <br /> O ® 0 ® ® ,<0 50,30-Jun-03) ' <br /> (210) <br /> � MW-9 <br /> _ r N <br /> '•may I ®I -{-® ®r p-33 47 Building 1 <br /> Canopy and u LJ <br /> yDispenser Islands <br /> MW-1 .33.49 <br /> i' W E <br /> N- <br /> MW-6 <br /> -33.51 Domestic well <br /> {<0 50,30-Jun-03) Waste Oil 160 feet <br /> (<0 50) Tank <br /> _ S <br /> Scale(fl) FIGURE <br /> a zo 40 80 2 <br /> 0 <br /> 1 <br /> Shell-branded Service Station Groundwater Contour/ <br /> 7700 Moreland Street <br /> Stockton, California G Chemical Concentration Map <br /> C A M B R I A December 18, 2003 <br />