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27-Mar-00 <br /> ROSE MARIE LANE <br /> \ Planter <br /> MW-1 <br /> 1> (<0 500) <br /> \ Waste s (<5 00) <br /> Oil �I <br /> \ Tank \ <br /> W <br /> Air& � <br /> Water Existing USTs <br /> - � z <br /> a <br /> Station - <br /> Building s\ <br /> ------------------- ------------ <br /> 'N— MW-20 Canopy and Exxon <br /> -770 t Dispenser Monitoring <br /> (<0 500) Islands Well <br /> -- Vent Lines ------------ --------------------------- --------- <br /> + <br /> SENA-2 (<o 500) <br /> (<0 500, 28-May-99) (<5 00) <br /> VEW-1 <br /> NA * MW-3 <br /> (<0 500), _7 92 <br /> Base map from Fugro map of 12 Nov 92 <br /> (<5 00) (<0 500) <br /> EXPLANATION -—--— (<5 00) <br /> } Groundwater Monitoring Well <br /> Former UST <br /> Vapor Extraction Well Location , <br /> Exxon Monitoring Well <br /> ` I Groundwater elevation contour in feet referenced <br /> to mean sea level (MSL) Arrows indicate <br /> approximate groundwater flow direction <br /> -780 Groundwater elevation in feet <br /> NA=Not available <br /> (<0 500) Benzene concentration in ppb <br /> (<5 00) MTBE concentration in ppb <br /> Scale <br /> <x=Not detected at detection limit x FIGURE <br /> (<0 500, 28-May-99) Benzene concentration in ppb and date 0 10 20 40 <br /> sampled 4011 <br /> Approximate Hydraulic Gradient=0 004 1 inch=20 Feet <br /> Shell-branded Service Station Groundwater Contour/ <br /> 4445 Pershing Avenue G Chemical Concentration Map <br /> Stockton, Caftfornla <br /> Incident No 98996182 C A M B R I A February 10, 2000 <br />