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17-Jul-01 <br /> PORTER AVENUE EXPLANATION <br /> MW-1 Groundwater monitoring well <br /> 6886 <br /> (<0 50) Vapor extraction well <br /> Former (1) Groundwater elevation contour in feet <br /> U Ts MW-2 T referenced to site datum Arrows <br /> 691 <br /> indicate approximate flow direction <br /> (<0 50) . <br /> 69 38 - - (<5 0) _ _ _ '6509 69.70 Groundwater elevation to feet <br /> (<0 50) `Existing <br /> (<5 0) E USTs (0 53) Benzene concentration in parts per <br /> VEW-2 ' VEW-1 <br /> NA i billion(ppb) <br /> (9,900) (<2 5) MTBE concentration to ppb by EPA <br /> ' (<500) Method 8260 <br /> Canopy and NA Not available <br /> Dispenser <br /> Islands © , <x Not detected at detection limit <br /> - - - <br /> MW-3 � Approx hydraulic gradient=0 004 <br /> 6923 Mme`-4 <br /> (<0 50) 6907 <br /> (<50) (70) d� <br /> (13) U <br /> w <br /> Parking U <br /> Area tib MW-6 _N_ <br /> 6908 <br /> (2 5) <br /> (<5 0) <br /> 691 <br /> Building <br /> I <br /> MW-7 <br /> 6912 <br /> (3,900) <br /> <20 <br /> Scale(ft) FIGURE <br /> 0 25 50 100 <br /> Base map from Fugro map of 10-Jan-94 2 <br /> Whell-branded Service Station Groundwater Contour/ <br /> 6131 Pacific Avenue © Chemical Concentration Ma <br /> Stockton, California p <br /> C A M B R I A May 11, 2001 <br />