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23 Apr 01 <br /> PORTER AVENUE EXPLANATION <br /> Mn5820) �' <br /> ♦ Groundwater monitoring well <br /> 6Vapor extraction well <br /> (0(< Groundwater elevation contour <br /> FormerUSTs MW.2 '�/ in feet referenced to Site Datum <br /> 69 21 Arrows indicate approximate flow <br /> (<0 500) direction <br /> 69 - ---(<2 5 <br /> 0) '- --- 6970 Groundwater elevation in feet <br /> Existing <br /> (2 00) __- USTs (0 534) Benzene concentration in parts per <br /> o billion(ppb) <br /> (<2 50) ` , -- VEW 1 <br /> 1 t VEW-2 <br /> T NA (<2 50) MTBE concentration in ppb <br /> (7,480) ` Analysis by EPA Method 8020 <br /> (<2,500) NA Not available <br /> Canopy and <x Not detected at detection limit x <br /> Dispenser MW-4 <br /> M Islands 6913 * denotes analysis EPA Method 8260 <br /> ---- - ' (308) <br /> MW-3 (18 Q)* Approx hydraulic gradient=0 002 <br /> 6925 Z <br /> (<0 500) W <br /> (<2 50) <br /> U <br /> w <br /> U <br /> –1\i– <br /> Parking 6 21 <br /> Area (1 18 I— <br /> (<2 50)-4 <br /> a <br /> n <br /> Building <br /> MW-7 <br /> 6917 <br /> (4,640) <br /> (<10 0) <br /> Scale(ft) FIGURE <br /> 0 25 50 100 2 <br /> Q <br /> oBase map from Fugro map of 1-10-94 <br /> Shell-branded Service Station Groundwater Contour/ <br /> 6131 Pacific Avenue G Chemical Concentration Map <br /> Stockton, California <br /> C A M B R I A March 16, 2001 <br />