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17-Jan 02 <br /> EXPLANATION <br /> Groundwater monitoring well <br /> Q / Groundwater elevation contour in feet <br /> /y referenced to site datum Arrows indicate <br /> 94 approximate groundwater flow direction <br /> 0 6116 Groundwater elevation in feet referenced <br /> to site datum <br /> (0 59) Benzene concentration in parts per billion <br /> (ppb) <br /> U (23 6) MTBE concentration in ppb by EPA <br /> Method 8260 <br /> `\ <x Not detected at detection limit x <br /> \ Approximate hydraulic gradient=0 02 <br /> Dispenser Island \ <br /> (typ) <br /> Station ` <br /> Building \ <br /> Q <br /> MW-3 <br /> 62 25� <br /> (<0 50) <br /> (I3) Former UST \ 6216 <br /> Existing _= Location \(<0S0) <br /> + USTs o + \(<5 Q) <br /> 62•00\ <br /> O � <br /> Planter '___ 61 75 <br /> 6150 <br /> — - - - - _MW_1 _ <br /> 61.32 - <br /> {0.59} ` -N- <br /> 3 6)= <br /> HAMMER LANE <br /> Scale(ft) <br /> FIGURE <br /> 0 15 30 60 2 <br /> N <br /> Base map from Fugm map of 6 Feb-96 <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 November 14, 2001 <br />