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4-Od-04 <br /> EXPLANATION <br /> + Monitoring Well <br /> -N- Groundwater elevation contour in feet <br /> referenced to mean sea level(ft msl) <br /> ® Arrows indicate approximate groundwater <br /> flow direction <br /> Scale A 6.12 Groundwater elevation in ft msl <br /> (0.89) Benzene concentration in parts per billion <br /> 0 15 30 60 (ppb) <br /> (<0 50) MTBE concentration in ppb <br /> <x Not detected at reporting limit x <br /> WEST YOSEMITE AVENUE Approximate hydraulic gradient= 0 01 <br /> yy Driveway Sidewalk <br /> PlanterT, � Planter <br /> MW-3 <br /> 612 583 Sidewalk <br /> Sidewalk (0.89) (<0.50) <br /> (<0 50) (<0.50) <br /> Retail <br /> MW-1 +- - <br /> ae <br /> 620 <br /> O5 r / -- <br /> �, Retail <br /> a <br /> A Former \ <br /> O Payless Shoe `;\ <br /> Source <br /> zI jij1T-5 <br /> f-i \ <br /> 7 �_a 5.62 \ ' <br /> h (<0 50) / <br /> Retail <br /> r/� r <br /> b� <br /> i- <br /> MW-2 <br /> 6.16 <br /> (<0 50) <br /> (<0.50) Retail <br /> A <br /> ElFIGURE <br /> 3 <br /> &�r—mer Shell Service Station Groundwater Contour/Chemical <br /> 1160 West Yosemite Avenue G Concentration Map <br /> Manteca, California <br /> C A M B R I A June zz, 2004 <br />