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Virginia Administrative Code
Title 9. Environment
Agency 5. State Air Pollution Control Board
Chapter 40. Existing Stationary Sources
12/22/2024

9VAC5-40-280. Standard for sulfur dioxide.

A. Noncombustion process operations. No owner or other person shall cause or permit to be discharged into the atmosphere from any process operation any sulfur dioxide emissions in excess of an in-stack concentration of 2000 ppm by volume.

B. Combustion installations.

1. No owner or other person shall cause or permit to be discharged into the atmosphere from any combustion installation any sulfur dioxide emissions in excess of the following limits:

a. S = 2.64K (AQCR 1 through 6)

b. S = 1.06K (for liquid or gaseous fuels - AQCR 7)

c. S = 1.52K (for solid fuels - AQCR 7)

where:

S = allowable emission of sulfur dioxide

expressed in lbs/hr.

K = actual heat input at total capacity expressed in Btu X 106 per hour.

2. Where there is more than one unit in a combustion installation and where the installation can be shown, to the satisfaction of the board, to be in compliance when the installation is operating at total capacity, the installation will be deemed to still be in compliance when the installation is operated at reduced load or one or more units are shut down for maintenance or repair, provided that the same type of fuel with the same sulfur content, or an equivalent, is continued in use.

3. For installations in AQCR 7 at which different fossil fuels are burned simultaneously, whether in the same or different units, the allowable emissions shall be determined by proration using the following formula:

PS = K

X(1.06) + Y(1.52)

X + Y

where:

PS = prorated allowable emissions of sulfur dioxide expressed in lb/hr.

X = percentage of actual heat input at total capacity derived from liquid or gaseous fuel.

Y = percentage of actual heat input at total capacity derived from solid fuels.

K = actual heat input at total capacity expressed in Btu X 106 per hour.

Statutory Authority

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

Historical Notes

Derived from VR120-04-0405, eff. January 1, 1985.

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