12 Va. Admin. Code § 5-421-2380
2. Equipped with a port cover assembly that is:
If a water tank is designed with an access port for inspection and cleaning, the opening shall be in the top of the tank and:
§§ 35.1-11 and 35.1-14 of the Code of Virginia.
Derived from Virginia Register Volume 18, Issue 10, eff. March 1, 2002.