9 Va. Admin. Code § 5-160-184
Federal agencies shall reduce the same type of pollutant as being increased by the federal action except the department may approve offsets or mitigation measures of different precursors of the same criteria pollutant, if such trades are allowed by the Commonwealth of Virginia in 9VAC5-80 (Permits for Stationary Sources) as approved in the applicable implementation plan, are technically justified, and have a demonstrated environmental benefit.
§ 10.1-1308 of the Code of Virginia.
Derived from Virginia Register Volume 27, Issue 11, eff. March 2, 2011.