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15-Jul 00 <br /> PORTER AVENUE EXPLANATION <br /> Groundwater Monitoring Well <br /> 69 22 Vapor Extraction Well <br /> 69 2 MW-1 <br /> <2 50) 69 70 Groundwater elevation contour <br /> Former ( *(0 534) / in feet referenced to Site Datum <br /> USTs ' (<2 50) �/ Arrows indicate approximate flow <br /> 7 / direction <br /> MW-5 6970 Groundwater elevation in feet <br /> 6874 -- - --- Existing <br /> (13 4) ----- o USTs NA-Not available <br /> (c2 50) VES,_ -_= VEW 1 (0 534) Benzene concentration in ppb <br /> NA (<2 50) MTBE(by EPA Method 8020) <br /> 90� (3,090) ; concentration in ppb <br /> 6 (<.500) <x =Not detected at detection lrrrrit x <br /> Canopy and <br /> / Dispenser Approx hydraulic gradient=0 006 to 0 017 <br /> bg5 )% � Islands <br /> ♦ / <br /> MW- -001% z <br /> 7017 1k <br /> N IW-4 <br /> ( 5) �5 1-e <br /> � � 6898 <br /> 2 <br /> ( ) 6 (4,130) U <br /> (660) }-+ <br /> U <br /> Parking MW-6 -e —N— <br /> Area 6847 . <br /> (551) \ <br /> (<25 0) \ <br /> s <br /> Building <br /> MW-7 <br /> 68.11 <br /> (3,300) <br /> Scale FIGURE <br /> v <br /> 0 25 50 100 2 <br /> 2.5 1 Base map from Fugro map of 1-10-94 1 Inch=50 Feet <br /> Well-branded Service Station Groundwater Contour/ <br /> 6131 Pacific Avenue G Chemical Concentration Map <br /> Stockton, California <br /> Incident No 98996189 C A M B R I A May 15, 2000 <br />