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4 <br /> 28-May-03 <br /> LOUISE AVENUE <br /> Planter <br /> Former USTs 1MW-210 Existing USTs Planter <br /> �\ <0.50 l 4) <br /> 42 Dispenser ®ice <br /> Islands <br /> MW-3 <br /> (U 1348 W <br /> <0.50051 <br /> i W <br /> v amu? Storage F' <br /> Building <br /> Trash <br /> Enclosure • Dispenser • i <br /> Islands – <br /> 1 Pla4ter �' L7 z <br /> 1 <br /> Storage <br /> MW-2 Containers <br /> 13.26 <br /> <0.50 ---- — — <br /> <0 50 �� S <br /> EXPLANATION <br /> -+- Groundwater Monitoring well <br /> ® Fuel dispenser numbers <br /> / Groundwater elevation contour in feet referenced <br /> / to mean sea level(ft msl) Arrows indicate <br /> approximate groundwater flow direction _N_ <br /> 13A2 Groundwater elevation in ft msl <br /> <0 50 Benzene concentration in parts per billion(ppb) <br /> 42 MTBE concentration in ppb <br /> <x Not detected at reporting limit x FIGURE <br /> Scale (ft) <br /> Approximate hydraulic gradient=0 001 <br /> 0 20 40 80 2 <br /> hell-branded Service Station © Groundwater Contour/ <br /> 1071 North Main Street Chemical Concentration Map <br /> Manteca, California <br /> C A M B R I A April 28, 2003 <br />