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12 Apr-00 <br /> PORTER AVENUE EXPLANATION <br /> Groundwater Monitoring Well <br /> Vapor Extraction Well <br /> MW-1 <br /> *MW-2 6824 Groundwater elevation contour <br /> Former b 6825 +(<0 500) in feet referenced to Site Datum <br /> USTs (<0 500) (<2 50) Arrows indicate approximate flow <br /> (<2 50) I / direction <br /> Existing 6828 Groundwater elevation in feet <br /> o o USTs NA=Nat available <br /> VEW-2 VEW-1 (219) Benzene concentration in ppb <br /> 4 <br /> NA <br /> (3,90) la�n <br /> (<250) MTBE(by EPA Method 8020) <br /> MW-5 (cSpO) concentration in ppb <br /> (< 49 <x=Not detected at detection lima x <br /> (<0 500) � <br /> Canopy and <br /> (<2 50) Dispenser (55/93,05-Sep-96) Benzene/MTBE <br /> Islands concentration and date <br /> sampled <br /> MTBE by EPA Method 8260 <br /> MW-4 <br /> MW. 6770 z Approx hydraulic gradient=0 004 <br /> 6828 (5440) <br /> (219) (<250) d <br /> (<2 50) \� U <br /> U <br /> Parking MW-61k <br /> -1�-Area 6818 <br /> (30 \ ` <br /> Building Ar <br /> MW-7 <br /> 6819 <br /> (6,070) <br /> <40 0 <br /> Scale FIGURE <br /> 0 25 50 100 2 <br /> v <br /> c Base map from Fugro map of 1-10-94 1 Inch=50 Feet <br /> hell-branded Service Station © Groundwater Contour/ <br /> 6131 Pacific Avenue Chemical Concentration Map <br /> Stockton, California <br /> Incident No 98996189 C A M B R I A February 3, 2000 <br />