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08-Mar-01 <br /> EXPLANATION <br /> Groundwater monitoring well <br /> Backfill well <br /> 0 Sump <br /> Groundwater elevation contour in feet referenced to <br /> mean sea level(ft msl) Arrows indicate approximate <br /> / groundwater flow direction <br /> MW-3A—Well designation <br /> 87 78—Groundwater elevation, ft msl <br /> 1 95---Benzene concentrations in groundwater in parts per <br /> (36 3k-" billion(ppb) <br /> MTBE concentrations in groundwater in ppb by EPA <br /> Method 8260 <br /> –N– <br /> NA Not Available <br /> <x Not detected at detection limit x <br /> MW-1A <br /> Approximate hydraulic gradient=0 001 8771 <br /> ----------------- — ------�------------ <20 - <br /> T , (21,000) <br /> MW-3A <br /> 8784 ` <br /> (i 9) <br /> all <br /> al 1� NAx <br /> 1 <br /> 10,000) a <br /> 1 1 0 <br /> Carwash <br /> � � U <br /> w a <br /> Canopy and [� <br /> Dispenser Islands Existing <br /> 'T Fuel USTs 1� <br /> ' - MW-2A <br /> 8774 <br /> <06 <br /> (480) <br /> Former UST <br /> Location <br /> Mp _INTERSTATE ROUTE N0.205 <br /> ON � <br /> FIGURE <br /> Scale(ft) <br /> 0 15 30 60 2 <br /> Base Map Fugro of 415195 <br /> Shell-branded Service Station Groundwater Contour/ <br /> 3725 Tracy Boulevard Chemical Concentration Map <br /> Tracy, California <br /> C A M B R I A January 23, 2001 <br />