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1s-Dec 99 <br /> ROSE MARIE LANE <br /> Planter <br /> \ *MW-1 <br /> -8 52 <br /> \ O lste -8S (<O 500) <br /> Tank (<2 50) <br /> \ W <br /> \ 0 W <br /> Air& � <br /> Water -84 d, <br /> Fuel USTx <br /> - rn <br /> ' a <br /> Station - <br /> ------------------------ <br /> Burlding -83 <br /> N <br /> MW-2 Canopy and LlExxon <br /> -826 Dispenser Monitoring <br /> (<0 500) Islands Well <br /> (<2 50) --- <br /> -�.� -- ----------------- --- --- <br /> -- Vent Lines ----------- + MW-4 <br /> NEW-21 -825 <br /> NA I (<0 500) <br /> (<0 500, 28-May-99) 1 (<2 50) <br /> I VEW-1 <br /> NA MW-3 <br /> (<0 500) -830 <br /> (<2 50) (<0 500) <br /> Base map from Fugm map of 12 Nov 1992 __—__ (<2 50) <br /> EXPLANATION Former USTs <br /> Groundwater Monitoring Well Location <br /> Vapor Extraction Well � <br /> - Exxon Monitoring Well <br /> • Groundwater elevation contour in feet referenced to <br /> 110, mean sea level (MSL) Arrows indicate approximate <br /> groundwater flow direction <br /> -826 Groundwater elevation in feet <br /> (<0 500)Benzene concentration in ppb <br /> (<2 50) MTBE concentration in ppb Scale FIGURE <br /> (<0 500, 28-May-99) Benzene concentrations in ppb and <br /> date sampled 0 10 20 40 <br /> Approximate Hydraulic Gradient= 0 004 1 Inch=20 Feet <br /> 2--1 <br /> Shell-branded Service Station © Groundwater Contour/ <br /> 4445 Pershing Avenue Chemical Concentration Map <br /> Stockton, California <br /> Incident No 98996182 C A M B R I A November 9, 1999 <br />