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14 Jan 03 <br /> EXPLANATION <br /> Groundwater monitoring well <br /> Q / Groundwater elevation contour in feet <br /> O /y referenced to mean sea level(ft msl) <br /> all \ Arrows indicate approximate <br /> groundwater flow direction <br /> Z ` \ -21.16 Groundwater elevation in ft msl <br /> (<0.50) Benzene concentration in parts per billion <br /> (ppb) <br /> U (<5 0) MTBE concentration in ppb by EPA <br /> Method 8260 <br /> COO <br /> \\ <x Not detected at reporting limit x <br /> W <br /> Approximate hydraulic gradient=0 0008 <br /> o \+.� Dispenser Island <br /> (typ) . <br /> Station ` <br /> Building \ <br /> MW-3 ri <br /> -27.34 <br /> (<0.50) MW-2 <br /> (<5 0) ^+ r� \ -2730 <br /> Existing (<0 50) <br /> USTs ­11-4 <br /> Planter <br /> ,Former UST \ <br /> \ Location <br /> -27 32 - - - - <br /> (<0 50} <br /> (<5 0) -N- <br /> HAMMER LANE <br /> Scale(ft) <br /> FIGURE <br /> J0 15 30 60 2 <br /> Base map from Fugm map of 6 FeE,-96 <br /> hell-branded Service Station © Groundwater Contour/ <br /> 7910 Lower Sacramento Road Chemical Concentration Map <br /> Stockton, California <br /> C A M B R I A October 30, 2002 <br />