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r Y � <br /> RADE/ASPHALT LEAD WIRE TO TRAFFIC RATED <br /> CELL Ox <br /> UNDERGROUND STORAGE TANK4-INCH DIA. <br /> HOLE DRILLED <br /> TO DEPTH <br /> UNDER TANK <br /> PERMANENT REFERENCE CELL <br /> TYPICAL PERMANENT REFERENCE ELECTRODE INSTALLATION DETAIL <br /> Figure 2 <br />