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Virginia Administrative Code
Title 9. Environment
Agency 5. State Air Pollution Control Board
Chapter 40. Existing Stationary Sources
12/31/2024

9VAC5-40-2930. Monitoring.

A. The provisions of 9VAC5-40-40 (Monitoring) apply.

B. Unless otherwise approved by the board, owners of sulfuric acid production units specified in subsection C of this section shall install, calibrate, maintain and operate systems for continuously monitoring and recording specified emissions in accordance with 9VAC5-40-40 and 9VAC5-40-41.

C. Sulfuric acid production units of greater than 300 tons per day production capacity (the production being expressed as 100% acid) shall be monitored for sulfur dioxide emissions.

D. The pollutant gas used to prepare calibration gas mixtures under paragraph 2.1, Performance Specifications 2 of Appendix B of 40 CFR 60 and for calibration checks under 9VAC5-40-41 shall be sulfur dioxide (SO2). Reference Method 8 shall be used for conducting monitoring system performance evaluations under of 9VAC5-40-41 except that only the sulfur dioxide portion of the Reference Method 8 results shall be used. The span shall be set at 1,000 ppm of sulfur dioxide.

E. The owner shall establish a conversion factor for the purpose of converting monitoring data into units of the applicable standard (lb/short ton). The conversion factor shall be determined, as a minimum, three times daily by measuring the concentration of sulfur dioxide entering the converter using suitable methods (e.g., the Reich Test, "Atmospheric Emissions from Sulfuric Acid Manufacturing Processes," see 9VAC5-20-21) and calculating the appropriate conversion factor for each eight-hour period as follows:

CF = k

(1.000 - 0.15r)

(r - s)

where:

CF = conversion factor (lb/short ton per ppm).

k = constant derived from material balance. For determining CF in English units, k = 0.1306.

r = percentage of sulfur dioxide by volume entering the gas converter. Appropriate corrections must be made for air injection plants subject to the approval of the board.

s = percentage of sulfur dioxide by volume in the emission to the atmosphere determined by the continuous monitoring system.

F. The average sulfur dioxide concentration in the flue gases shall be multiplied by the conversion factor to obtain the average sulfur dioxide emissions in units of the applicable standard. The owner shall record all conversion factors and values under subsection E of this section from which they were computed (i.e., CF, r, and s).

Statutory Authority

§ 10.1-1308 of the Code of Virginia.

Historical Notes

Derived from VR120-04-2111, eff. January 1, 1985; amended, Virginia Register Volume 18, Issue 7, eff. February 1, 2002.

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