(A) The house sanitary connection shall be six inch (6") vitrified clay or four inch (4") or six inch (6") cast-iron pipe, except that within five feet (5') of the outside of a building it shall be of cast-iron, and have a minimum inside diameter of four inches (4").
(B) All underground pipes when within four feet (4') or less of the surface of the ground under a driveway shall be of cast-iron pipe, or of vitrified clay pipe having an envelope of concrete of a mix of 1:2:4 or better and at least three inches (3") in thickness.
(C) Where a connection or drain is laid at less distance than five feet (5') from the exterior wall of any building, or in ground where it will be subjected to vibration, or to settlement, cast-iron pipe shall be used. Where the ground is of sufficient solidity for a proper foundation or where special supports or secure foundations are provided, vitrified clay or cast-iron pipe may be used.