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EXPLANATION <br /> Scale <br /> Ground Water Monitoring Well <br /> 0 15 30 60 Feet <br /> A I Inch=30 Feet Ground water elevation contour in feet <br /> referenced to mean sea level (MSL) <br /> �O \ Arrows indicate approximate ground <br /> O water flow direction <br /> 6255 Ground water elevation in feet above site <br /> W \ datum <br /> (ND) Benzene concentration in ppb <br /> ND=Not Detected <br /> ` (49) MTBE concentration in ppb <br /> Notes Monitoring performed 28-Jul-98 <br /> Approximate hydraulic gradient=0 003 <br /> O <br /> a , <br /> Station <br /> Building N <br /> Canopy and \ <br /> Dispenser Island <br /> Q <br /> MW-3 <br /> 62 55 <br /> (ND) _ <br /> Existing USTs I� \\MW-2 <br /> ' X62 6 <br /> 6260 <br /> 1 Canopy and Former UST (ND) <br /> Dispenser Islands: Location (2 5) <br /> o, <br /> \ 1 - - - - - -lih —62 <br /> 6270 62 70 <br /> (0.72) <br /> _(29) <br /> HAMMER LANE <br /> Base map from Fugro map of 6-Feb-96 <br /> PLATE GROUND WATER CONTOUR/CHEMICAL CONCENTRATION MAP <br /> Shell-branded Service Station AMB�A <br /> Z7910 Lower Saciamento Road 240-0832 <br /> Stockton, California <br /> Drawn By AKC Date 06-Oct-98 Approved By -a-\ _Date <br />