Virginia Administrative Code
Title 9 - ENVIRONMENT
Agency 5 - STATE AIR POLLUTION CONTROL BOARD
Chapter 40 - EXISTING STATIONARY SOURCES
Part II - Emission Standards
Article 23 - Emission Standards for Nitric Acid Production Units (Rule 4-23)
Section 9VAC5-40-3210 - Monitoring

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

B. Unless otherwise approved by the board, owners of existing sources specified in subsection C of this section shall install, calibrate, maintain and operate systems for continuously monitoring and recording emissions of specified pollutants.

C. Nitric acid plants of greater than 300 tons per day production capacity (the production capacity being expressed as 100% acid) shall be monitored for nitrogen oxides emissions.

D. The pollutant gas used to prepare calibration gas mixtures under paragraph 2.1, Performance Specification 2 of Appendix B of 40 CFR 60 and for calibration checks under 9VAC5-40-41 shall be nitrogen dioxide (NO2). The span shall be set at 500 ppm of nitrogen dioxide. Reference Method 7 shall be used for conducting monitoring system performance evaluations under 9VAC5-40-41.

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 established by measuring emissions with the continuous monitoring system concurrent with measuring emissions with the applicable reference method tests. Using only that portion of the continuous monitoring emission data that represents emission measurements concurrent with the reference method test periods, the conversion factor shall be determined by dividing the reference method test data average by the monitoring data averages to obtain a ratio expressed in units of the applicable standard to units of the monitoring data, i.e., lb/short ton per ppm. The conversion factor shall be reestablished during any emission test under 9VAC5-40-30 or any continuous monitoring system performance evaluation under 9VAC5-40-41. The average nitrogen oxides concentration in the flue gases shall be multiplied by the conversion factor to obtain the average nitrogen oxides emissions in the units of the applicable standard.