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PORTER AVENUE <br /> MW-2 ' ' MW-1 <br /> 5977 5970 <br /> (ND) I I ' -�- (ND) Existing UST <br /> Former UST Location <br /> Location I I (3-10,000 galCZ <br /> } <br /> - - - - - < , W <br /> -VEW-1 Q <br /> DRY NM ' U <br /> ' Building ' I <br /> 'Canopy and ' <br /> Dispenser Islands <br /> 1 n ' <br /> o <br /> MW-3 iN <br /> 59.75 <br /> (290) <br /> EXPLANATION <br /> Ground Water Monitoring Well <br /> Vapor Extraction Well <br /> N Ground water elevation contour <br /> in feet referenced to Mean Sea <br /> Level (MSL) Arrows indicate <br /> Scale approximate flow direction <br /> 0 15 30 64 Feet 59.75 Ground water elevation in feet <br /> above MSL <br /> I Inch=30 Feet (290) <br /> Benzene concentration in ppb <br /> ND=Not Detected <br /> NM Not monitored <br /> Notes Monitoring performed on 22-Aug-97 <br /> Base map from Fugro map of 1-10-94 Approximate hydraulic gradient=0 001 <br /> 4 PLATE GROUND WATER CONTOUR BENZENE CONCENTRATION MAP <br /> Shell Service Station environ <br /> 2 6131 Pacific Avenue 97374 <br /> Stockton, California <br /> Drawn By MED Date 27-Oct-97 Approved By Date <br />