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Virginia Administrative Code
Title 9. Environment
Agency 5. State Air Pollution Control Board
Chapter 40. Existing Stationary Sources
12/21/2024

9VAC5-40-5680. Other mobile sources.

A. General. All mobile sources operating within Virginia, including the air space over this Commonwealth, shall control their emissions in strict accordance with the applicable federal laws and regulations.

B. Visible emissions. The provisions of 9VAC5-40-80 shall apply to the discharge of visible emissions from all mobile sources, unless specified otherwise in subsection C of this section.

C. Exceptions.

1. Aircraft. Subsection B of this section shall not apply to aircraft.

2. Diesel locomotives. Visible emissions from operating diesel-powered locomotives shall not exceed a density greater than 30% opacity unless the locomotive is operating under any of the following conditions:

a. Accelerating under load, and then only for a maximum of 40 consecutive seconds for stabilization of the new operating condition;

b. Being loaded after a period of idle, and then only for a maximum period of four consecutive minutes after the changed condition;

c. Started cold, and then only for a maximum of 30 consecutive minutes after such a start; or

d. Being tested, adjusted, or broken in after rebuilding or repair, and then only for maximum periods of 3 consecutive minutes for an aggregate of no more than 10 minutes in any 60-minute period.

3. Ships and other watercraft. Visible emissions in excess of subsection B of this section are authorized when not at dock and for brief periods when at dock under the following conditions:

a. During dock trials as required to test and calibrate the ship's machinery control systems;

b. When lighting off a cold machinery plant and getting under way;

c. When used on shore to simulate dock or sea trials; or

d. When soot blowing. Soot blowing shall be limited to once in each 24-hour period and shall be allowed only when wind conditions and direction are such as to prevent a public nuisance or hazard to the health and safety of persons and property both ashore and afloat.

4. Other diesel-powered mobile sources. Visible emissions from diesel-powered mobile sources which are not otherwise governed by these regulations shall not exceed 20% opacity for longer than 10 consecutive seconds after the engine has been brought up to operating temperature.

Statutory Authority

§§ 10.1-1307 and 10.1-1308 of the Code of Virginia.

Historical Notes

Derived from VR120-04-4104, eff. January 1, 1985.

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