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23-Deo-99 <br /> PORTER AVENUE EXPLANATION <br /> Groundwater Monitoring Well <br /> Vapor Extraction Well <br /> MW-] <br /> Former 6660 Groundwater elevation contour <br /> UST MW-2 +(<0 500) R -� m feet referenced to Site Datum <br /> 66 72 r t<2 50) y Arrows indicate approximate flow <br /> (38 8) / direction <br /> (19 9) I <br /> Existing 6672 Groundwater elevation in feet <br /> USTs NA=Not available <br /> w>W_2 --vEw (38 8) Benzene concentration in ppb <br /> NA INA I (19 9) MTBE concentration in ppb <br /> (4,130) (55,05-Sep-96) <br /> 66 76 (<I,250) � (55,05-Sep-96) Benzene concentration <br /> 66 76 /�� <br /> (<0 500) ; / and date sampled <br /> (<2 50) Canopy and Approx hydraulic gradient=0 004 to 0 005 <br /> Dispenser <br /> Islands ' <br /> 66 72+ J ' MW-4 <br /> (273) 66 34 Z <br /> (618) ac (6(5,980 <br /> (58) <br /> U <br /> Parking MW-6 I —N-- <br /> Area 6660 <br /> (4 96) f <br /> (c5 00) <br /> +1 <br /> 1 <br /> Building <br /> I <br /> A <br /> MW-7 <br /> 6636 <br /> (3,980) <br /> {6b6) <br /> Scale FIGURE <br /> v <br /> 0 25 50 1002 <br /> o Base map from Fugro map of 1-10-94 1 Inch=50 Feet <br /> Cell-branded Service Station Groundwater Contour/Chemical <br /> 6131 Pacific Avenue G Concentration Map <br /> Stockton, California <br /> Incident No 98996189 C A M B R I A November 2, 1999 <br />