1. (a) Each valve in gas or vapor or light liquid service shall be monitored monthly to detect leaks by the methods specified in Subsection R315-265-1063(b) and shall comply with Subsections R315-265-1057(b) through R315-265-1057(e), except as provided in Subsections R315-265-1057(f), R315-265-1057(g), and R315-265-1057(h), and Sections R315-265-1061 and R315-265-1062.
2. (b) If an instrument reading of 10,000 ppm or greater is measured, a leak is detected.
3. (c)(1) Any valve for which a leak is not detected for two successive months may be monitored the first month of each succeeding quarter, beginning with the next quarter, until a leak is detected.

4. (2) If a leak is detected, the valve shall be monitored monthly until a leak is not detected for two successive months.

   1. (d)(1) If a leak is detected, it shall be repaired as soon as practicable, but no later than 15 calendar days after the leak is detected, except as provided in Section R315-265-1059.

5. (2) A first attempt at repair shall be made no later than five calendar days after each leak is detected.

   1. (e) First attempts at repair include the following best practices when practicable:
6. (1) Tightening of bonnet bolts.
7. (2) Replacement of bonnet bolts.
8. (3) Tightening of packing gland nuts.

9. (4) Injection of lubricant into lubricated packing.

   1. (f) Any valve that is designated, as described in Subsection R315-265-1064(g)(2), for no detectable emissions, as indicated by an instrument reading of less than 500 ppm above background, is exempt from the requirements of Subsection R315-265-1057(a) if the valve:
10. (1) has no external actuating mechanism in contact with the hazardous waste stream;
11. (2) is operated with emissions less than 500 ppm above background as determined by the method specified in Subsection R315-265-1063(c); and

12. (3) is tested for compliance with Subsection R315-265-1057(f)(2) initially upon designation, annually, and at other times as requested by the director.

    1. (g) Any valve that is designated, as described in Subsection R315-265-1064(h)(1), as an unsafe to monitor valve is exempt from the requirements of Subsection R315-265-1057(a) if:
13. (1) the owner or operator of the valve determines that the valve is unsafe to monitor because monitoring personnel would be exposed to an immediate danger as a result of complying with Subsection R315-265-1057(a); and

14. (2) the owner or operator of the valve adheres to a written plan that requires monitoring of the valve as frequently as practicable during safe-to-monitor times.

    1. (h) Any valve that is designated, as described in Subsection R315-265-1064(h)(2), as a difficult to monitor valve is exempt from the requirements of Subsection R315-265-1057(a) if:
15. (1) the owner or operator of the valve determines that the valve cannot be monitored without elevating the monitoring personnel more than two meters above a support surface;
16. (2) the hazardous waste management unit where the valve is located was in operation before June 21, 1990; and
17. (3) the owner or operator of the valve follows a written plan that requires monitoring of the valve at least once per calendar year.

KEY: hazardous waste, TSD facilities, interim status

Date of Last Change: November 17, 2025

Notice of Continuation: December 11, 2025

Authorizing, and Implemented or Interpreted Law: 19-6-105; 19-6-106