9 Va. Admin. Code § 25-115-20
§ 62.1-44.15 of the Code of Virginia; § 402 of the Clean Water Act; 40 CFR Parts 122, 123, and 124.
Derived from Virginia Register Volume 12, Issue 20, eff. July 24, 1996; amended, Virginia Register Volume 17, Issue 16, eff. July 24, 2001; Volume 22, Issue 9, eff. February 8, 2006; Volume 27, Issue 12, eff. July 24, 2011; Volume 32, Issue 5, eff. July 24, 2016; Volume 37, Issue 12, eff. July 24, 2021; Volume 39, Issue 4, eff. November 9, 2022.