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O <br /> rt <br /> O <br /> Q. <br /> oExtractor Pump Manways <br /> Overspill <br /> eD„D Concrete . Sump <br /> o Fill Port <br /> M <br /> o Piping Sump Piping Sump <br /> v Sensor Monitoring <br /> -;o ... Column <br /> P ___ _______________ __ - <br /> a <br /> ____-- , <br /> .. , <br /> e <br /> Vent Pipe S ° <br /> Magnetostrictive Drop Tube Pea Gravel <br /> Float Ball Probe <br /> Valve ' <br /> , <br /> , <br /> w Primary Tank ° <br /> S Pit liner <br /> , <br /> Secondary Tank ' <br /> ° <br /> Pump Tube ° <br /> ° <br /> Scale Met) <br /> —� Interstitial <br /> cn a &0 so Space Sensor <br /> 0 <br /> Figure 3. Cross-section of UST 879-G3U1 <br />