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28-Apr 08 <br /> EXPLANATION <br /> + Monitoring Well <br /> Groundwater elevation contour in feet <br /> -N- referenced to mean sea level(ft ms]) <br /> �! Arrows indicate approximate groundwater <br /> flow direction <br /> 13.61 Groundwater elevation in ft msl <br /> Scale(it) (91) Benzene concentration in micrograms per <br /> Itter(µg/L) <br /> 0 15 30 60 (<I 0) MTBE concentration in pg/L <br /> NA Not analyzed <br /> WEST YOSEMITE AVEUNE <x Not detected at reporting limit x <br /> MW-3 <br /> Approximate hydraulic gradient;0 001 <br /> 136 4 <br /> (11} Driveway 13.68 Sidewalk <br /> I(NA) (0.2 <br /> Planter I + (NA) Planter <br /> Drain�� <br /> Sidewalk <br /> Sidewalk <br /> \ Former <br /> MW-1 ____\ 1 Dispenser Islands <br /> 13.61 ;» -J 1 -----, <br /> (9.1) ---- J Retail <br /> y (NA) / <br /> R <br /> 3 <br /> -o Former Underground <br /> rn Retail Storage Tanks <br /> A Former <br /> OPayless Shoe <br /> a SourceIN <br /> � <br /> ` <br /> b MW-5 <br /> 13.67 <br /> ro ,� (<0.50) <br /> Sidewalk �O (NA) <br /> Q Retail <br /> F spm <br /> MW-2 <br /> 13 58 Concrete Pad <br /> (<0.50) Former UST <br /> (NA) Retail <br /> [Trash] FIGURE <br /> 0 2 <br /> *o—rmer Shell Service Station © Groundwater Contourl <br /> 1160 West Yosemite Avenue Chemical Concentration Map <br /> Manteca, California C A M B R 1 A <br /> March 16,2006 <br />