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29-Mar 01 <br /> EXPLANATION <br /> + Groundwater monitoring well <br /> Q R Groundwater elevation contour in feet <br /> Q' \ referenced to site datum Arrows indicate <br /> approximate groundwater flow direction <br /> 6238 Groundwater elevation in feet referenced <br /> to site datum <br /> (<0 500) Benzene concentration in parts per <br /> billion (ppb) <br /> U (<2 50) MTBE concentration to ppb by EPA <br /> Method 8020 *Denotes MTBE by EPA <br /> Method 8260 <br /> W <x Not detected at detection limit x <br /> \ Approximate hydraulic gradient=0 003 <br /> Dispenser Island \ <br /> (typ) \ <br /> Station \ <br /> �] Building <br /> U ,\ <br /> \ <br /> MW.3 \ <br /> 6681 <br /> (<0 500)+ c� <br /> (313*) as CP <br /> Existing <br /> +�66 70 <br /> 1 (<0 500) <br /> (<2 50) <br /> Planter Former UST <br /> \ Location <br /> - -- --------------- MW-1T <br /> _ <br /> 6585----- — --------- <br /> (<0 500) <br /> (<2 50 -N- <br /> HAMMER LANE <br /> Scale(ft) <br /> FIGURE <br /> 0 15 30 64 <br /> Bace map Irum Fugw map of 6 Feb 96 2 <br /> _.ji <br /> Shell-branded Service Station ® Groundwater Contour/ <br /> 7910 Lower Sacramento Road Chemical Concentration Map <br /> Stockton, California <br /> C A M B R I A February 23, 2001 <br />