Any plastic or other nonmetallic pressurized conduit installed underground on and after July 1, 1976, shall have affixed thereto a wire conductive of electricity or some other means of locating the conduit while it is underground.
Means of locating nonmetallic underground conduits
Va. Code Ann. § 56-257.1, under Chapter 10. Heat, Light, Power, Water and Other Utility Companies Generally..
Va. Code Ann. § 56-257.1