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EXPLANATION <br /> Scale <br /> Ground Water Monitoring Well <br /> 0 15 30 60 Feet <br /> A 1 Inch=30 Feet Ground water elevation contour to feet <br /> Q referenced to mean sea level(MSL) <br /> O <br /> Arrows indicate approximate ground <br /> water flow direction <br /> O <br /> Z <br /> 5991 Ground water elevation in feet above MSL <br /> \ (0 69) Benzene concentration in ppb <br /> ND=Not Detected <br /> (3 3) MTBE concentration to ppb <br /> a Notes Monitoring performed 11-Feb-98 <br /> Approximate hydraulic gradient=0 06 <br /> O \ � <br /> a , <br /> Station <br /> Building N <br /> Canopy and \ <br /> Dispenser Island <br /> Q <br /> MW-3 <br /> y <br /> 5991 <br /> •(0 69) , <br /> ,- - -I (33j� <br /> Existing USTs; \\MW-2 <br /> o - 60 57 <br /> Former UST (14) <br /> Canopy and <br /> ocation 600 (ND) <br /> 1 � <br /> QDt$penser Islan Lis <br /> - - - - - - - - MW-1 <br /> 63 <br /> (3 5) ! <br /> (3 5) <br /> (ND <br /> HAMMER LANE <br /> Base map from Fugro map of 6-Feb-96 <br /> PLATE GROUND WATER CONTOURICHEMICAL CONCENTRATION MAP <br /> Shell Service Station C AMBR�A <br /> 2 7910 Lower Sacramento Road 240-0832 <br /> Stockton, California <br /> Drawn By TNM Date 10-Apr-98 Approved By (�Date -r q Rf <br />