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31-Jan 01 <br /> s it <br /> PORTER AVENUE EXPLANATION <br /> -V -�- Groundwater monitoring well <br /> 67 42 + Vapor extraction well <br /> (<0 500) <br /> MW-2 <br /> Former # 67 8 ( ) � Groundwater elevation contour <br /> USTs in feet referenced to Site Datum <br /> (<2 50) Arrows indicate approximate flow <br /> direction <br /> 6970 Groundwater elevation 1n feet <br /> VEW-2 __ ' -----, -USTs <br /> NA --' (0 534) Benzene concentration in <br /> arts per billion(ppb) <br /> 00) <br /> o � p <br /> (2,530) , __-= VEW-1 � - <br /> MW-5 ( (<250) Analysis bycEPAtion in p <br /> Method020 <br /> 67.75 <br /> (115) NA Not available <br /> (11 5MW-3 Canopy and <br /> (c2 50} I <br /> 6750 Dispenser <x Not detected at detection limit x <br /> (1 97) Islands MW-4 * Samples were analyzed outside of EPA <br /> (YO 3) �-' ___ <br /> 6735 W recommended holdtlme <br /> 1 (1,500) <br /> -T (206) Approx hydraulic gradient=0 OZ <br /> 7.6 z <br /> l <br /> 679 U <br /> 68 2 . — U <br /> Parking <br /> MW-6 1 1t -N- <br /> Area 68 46 1 <br /> _(754) <br /> (5 85 <br /> Building <br /> MW-7 <br /> 6731 <br /> (4,270)* <br /> Scale FIGURE <br /> 0 25 50 100 2 <br /> C0 Base map from Fugro map of I-10-94 1 Inca=50 Feet <br /> Shell-branded Service Station Groundwater Contour/ <br /> 6131 Pacific Avenue G Chemical Concentration Map <br /> Stockton, California <br /> C A M B R I A November 21, 2000 <br />