12 Va. Admin. Code § 5-610-750
All sewers shall be of cast iron (CI) pipe not less than service weight, schedule 40 plastic pipe, extra strength vitrified clay or other acceptable materials to be evaluated on a case-by-case basis. Bituminous fiber pipe is prohibited. Sewers passing under driveways shall be heavy duty CI or schedule 40 plastic pipe, or other acceptable material to be evaluated on a case-by-case basis.
§§ 32.1-12 and 32.1-164 of the Code of Virginia.
Derived from VR355-34-02 § 4.10, eff. February 5, 1986; amended, Virginia Register Volume 4, Issue 14, eff. May 11, 1988.