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Virginia Administrative Code
Title 9. Environment
Agency 5. State Air Pollution Control Board
Chapter 50. New and Modified Stationary Sources
11/23/2024

9VAC5-50-40. Monitoring.

A. Unless otherwise approved by the board or specified in applicable subparts listed in 9VAC5-50-410, the requirements of this section shall apply to all continuous monitoring systems required for affected facilities in accordance with applicable subparts listed in 9VAC5-50-410. However, nothing in this chapter shall exempt any owner from complying with subsection F of this section.

B. All continuous monitoring systems and monitoring devices shall be installed and operational prior to conducting performance tests under 9VAC5-50-30. Verification of operational status shall, as a minimum, include completion of the manufacturer's written requirements or recommendations for installation, operation and calibration of the device.

C. During any performance tests required under 9VAC5-50-30 or within 30 days thereafter and at such other times as may be requested by the board, the owner of any affected facility shall conduct continuous monitoring system performance evaluations and furnish the board within 60 days of them two or, upon request, more copies of a written report of the results of such tests. These continuous monitoring system performance evaluations shall be conducted in accordance with the requirements and procedures contained in the applicable performance specification of Appendix B of 40 CFR Part 60.

D. Unless otherwise approved by the board, all continuous monitoring systems required by subsection A of this section shall be installed, calibrated, maintained and operated in accordance with applicable requirements in this section, 40 CFR 60.13 and the applicable subpart listed in 9VAC5-50-410.

E. After receipt and consideration of written application, the board may approve alternatives to any monitoring procedures or requirements of this chapter including, but not limited to, the following:

1. Alternative monitoring requirements when installation of a continuous monitoring system or monitoring device specified by this chapter would not provide accurate measurements due to liquid water or other interferences caused by substances within the effluent gases.

2. Alternative monitoring requirements when the affected facility is infrequently operated.

3. Alternative monitoring requirements to accommodate continuous monitoring systems that require additional measurements to correct for stack moisture conditions.

4. Alternative locations for installing continuous monitoring systems or monitoring devices when the owner can demonstrate that installation at alternate locations will enable accurate and representative measurements.

5. Alternative methods of converting pollutant concentration measurements to units of the applicable standards.

6. Alternative procedures for performing daily checks or zero and span drift that do not involve use of span gases or test cells.

7. Alternatives to the ASTM test methods or sampling procedures specified by any subpart listed in 9VAC5-50-410.

8. Alternative continuous monitoring systems that do not meet the design or performance requirements in Performance Specification 1 of Appendix B of 40 CFR Part 60, but adequately demonstrate a definite and consistent relationship between its measurements and the measurements of opacity by a system complying with the requirements in Performance Specification 1 of Appendix B of 40 CFR Part 60. The board may require that demonstration be performed for each affected facility.

9. Alternative monitoring requirements when the effluent from a single affected facility or the combined effluent from two or more affected facilities are released to the atmosphere through more than one point.

10. Alternative monitoring systems that meet the requirements of 40 CFR Part 75 (i) if a source is subject to 40 CFR Part 75 or (ii) if the board determines that the requirements of 40 CFR Part 75 are more appropriate for the source than the pertinent provisions of this chapter.

F. Upon request of the board, the owner of a new or modified source subject to the provisions of this chapter shall install, calibrate, maintain and operate equipment for continuously monitoring and recording emissions or process parameters or both in accordance with methods and procedures acceptable to the board.

Statutory Authority

§ 10.1-1308 of the Code of Virginia.

Historical Notes

Derived from VR120-05-04, eff. January 1, 1985; amended, Virginia Register Volume 18, Issue 21, eff. August 1, 2002.

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