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DETAIL <br />ROADWAY SURFACE <br />6 INCH <br />DUCTILE <br />3 INCHES OF RIDGID <br />STYROFOAM <br />INSULATION BOARD <br />2.0· <br />2.0' <br />IRON PIPE -----+--+--~ <br />4 INCH P. V.C. <br />GRAVITY SEWER LINE <br />COMPACTED <br />FILL