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2s Oct-01 <br /> PORTER AVENUE EXPLANATION <br /> MW-1 + Groundwater monitoring well <br /> 66 20 I <br /> (<0 50) Vapor extraction well <br /> FormerMW-2 (<0 50) ' Groundwater elevation contour in feet <br /> USTs 6631 referenced to site datum Arrows <br /> (1 5) 7 indicate approximate flow direction <br /> +/ <br /> MW-5 (0 Sl} <br /> 6655 ` __ - - - -i ;' Existing 69.70 Groundwater elevation in feet <br /> (<0 50) USTs' ' USTs (0 53) Benzene concentration to parts per <br /> (< 0} VEW-2 i billion(ppb) <br /> NA ' <br /> (2,600) ! (<2 5) MTBE concentration in ppb by EPA <br /> "' (<25) i Method 8260 <br /> L Canopy and NA Not available <br /> +� Dispenser <br /> a Islands <x Not detected at detection limit x <br /> 3 � Approximate hydraulic gradient=0 003 <br /> 6630 MW-4 <br /> �o (16) 6612 [sl <br /> (<0 50) (21) <br /> (7 4) U <br /> w <br /> Parking U <br /> Area MVV.6 _N <br /> 66 21 <br /> (3 6)—�v <br /> (<0 50) b <br /> Building <br /> �., -7 <br /> 6609 <br /> (300) <br /> (<2 0) <br /> Scale(ft) FIGURE <br /> in <br /> 0 25 50 100 2 <br /> o Base map from Fugro map of 10-Jan-94 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 <br /> August 30, 2001 <br />