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10D. SEALING VERTICAL PIPE RISERS LOCATED OUTSIDE A CONTAINMENT <br /> SUMP OR STXNDPIPE (THIS INCLUDES MONITOR RISER. ) : <br /> * ALL PIPE RISERS SHALL BE TIGHTLY WRAPPED (AS SHOWN IN FIGURE <br /> 10D) FROM THE TOP OF THE TANK, UP THE TANK NOZZLE, AND UP THE <br /> PIPE AT LEAST 6" WITH A HALF-LAPPED STRIP OF FIBERGLASS MAT. ' <br /> * AT INSTALLATIONS WHERE GROUND WATER COULD RISE ABOVE THE TOP OF <br /> THE TANK, ALL PIPE RISERS SHALL BE DOUBLE WRAPPED . AS DESCRIBED <br /> ABOVE . TO A LEVEL OF 6" ABOVE THE MAXIMUM HIGH WATER LEVEL . <br /> II I <br /> II6" Min . <br /> Aw ' II <br /> HIGH WATER LEVEL <br /> 6" Min . II -smog <br /> FIG . 100 <br /> 7 rev . 7/13/90 <br />