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Virginia Administrative Code
Title 9. Environment
Agency 5. State Air Pollution Control Board
Chapter 40. Existing Stationary Sources
9/26/2020

9VAC5-40-3430. Standard for Volatile Organic Compounds.

A. Filling of storage tanks.

1. No owner or other person shall use or permit the use of any stationary storage tank for storage of any volatile organic compound unless such tank is equipped with a control method that will remove, destroy or prevent the discharge into the atmosphere of at least 60% by weight of volatile organic compound emissions during the filling of such tank.

2. Achievement of the emission standard in subsection A 1 of this section by use of the methods in 9VAC5-40-3440 A will be acceptable to the board.

3. Exempted from the provisions of this subsection are stationary storage tanks with a storage capacity of 2,000 gallons or less.

B. Volatile organic compound storage - fixed roof tanks.

1. No owner or other person shall use or permit the use of any fixed roof tank for storage of volatile organic compounds unless such tank is equipped with a control method which will remove, destroy or prevent the discharge into the atmosphere of at least 90% by weight of volatile organic compound emissions.

2. Achievement of the emission standard in subsection B 1 of this section by use of control methods in 9VAC5-40-3440 B will be acceptable to the board.

3. Exempted from the provisions of this subsection are stationary storage tanks with a storage capacity of 40,000 gallons or less.

4. The owner of a fixed roof tank subject to the provisions of subsection B 1 of this section shall:

a. When the fixed roof tank is equipped with an internal floating roof, perform a visual inspection annually of the floating cover through the roof hatches, to ascertain compliance with the specifications in subsection B 4 (1) and (2).

(1) The cover should be uniformly floating on or above the liquid and there should be no visible defects in the surface of the cover or liquid accumulated on the cover.

(2) The seal must be intact and uniformly in place around the circumference of the cover between the cover and tank wall.

b. Perform a complete inspection of the cover and seal and record the condition of the cover and seal when the tank is emptied for nonoperational reasons such as maintenance, an emergency, or other similar purposes.

c. Maintain records of the average monthly storage temperature and true vapor pressure of the liquid as stored, and the results of the inspection performed under the provisions of subsection B 4 a and b of this section.

C. Volatile organic compound storage - floating roof tanks.

1. No owner or other person shall use or permit the use of any floating roof tank for storage of volatile organic compounds, unless such tank is equipped with a control method which will remove, destroy or prevent the discharge into the atmosphere of at least 90% by weight of volatile organic compound emissions.

2. Achievement of the emission standard in subsection C 1 of this section by use of methods in 9VAC5-40-3440 C will be acceptable to the board.

3. Exempted from the provisions of this subsection are stationary storage tanks with a storage capacity of 40,000 gallons or less.

4. The owner of a floating roof tank subject to the provisions of subsection C 1 of this section shall:

a. Perform routine inspections annually which shall include a visual inspection of the secondary seal gap.

b. When the floating roof is equipped with a vapor-mounted primary seal, measure the secondary seal gap annually in accordance with subsections C 4 b (1) and (2) of this section.

(1) Physically measuring the length and width of all gaps around the entire circumference of the secondary seal in each place where a 1/8 inch uniform diameter probe passes freely (without forcing or binding against the seal) between the seal and tank wall; and

(2) Summing the area of the individual gaps.

c. Maintain records of the types of volatile organic compounds stored, the maximum true vapor pressure of the liquid as stored, and the results of the inspections performed under the provisions of subsection C 4 a and b of this section.

Statutory Authority

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

Historical Notes

Derived from VR120-04-2503, eff. July 1, 1991.

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