1. (a) When MALs have been established in a previous permit and a parameter(s) has been monitored for one complete permit cycle (five years), performance-based monitoring frequency reductions or increases will be considered.
2. (1) Except for ammonia, when a permittee has experienced:
3. (A) no permit limit violation of any kind for a limited parameter during the permit cycle, a performance-based monitoring frequency reduction may be granted according to Table O-1 in Appendix O.
4. (B) a non-SNC permit limit violation during the permit cycle, the permittee is ineligible for a performance-based monitoring frequency reduction for that parameter for the ensuing permit cycle.
5. (C) SNC violations for a parameter during the permit cycle, the permittee is:
6. (i) ineligible for a performance-based monitoring frequency reduction for that parameter for the ensuing permit cycle, and
7. (ii) a monitoring frequency increase is required in accordance with Table O-2 in Appendix O.
8. (2) Permittees may request toxicity-based ammonia limit monitoring frequency reductions according to 252:606-6-26 or WET testing frequency reductions according to 252:606-6-42.
9. (3) The monitoring frequency for a metal may be reduced below the levels stated in Table O-1 in Appendix O to once every six months if:
10. (A) the permit includes a long-term average effluent concentration for the permit cycle of less than ten percent (10%) of the Monthly Average Concentration Limit;
11. (B) it no longer exhibits reasonable potential (either from monitoring or effluent limit);
12. (C) there is a limit for that parameter in a previous permit that cannot be removed; and
13. (D) the parameter is not causing the receiving water body to be listed as a Category 5 water body in Oklahoma’s Integrated Report.
14. (b) Performance-based monitoring frequency reductions shall not be based on a weekly average, a daily minimum or a daily maximum concentration limit.
15. (c) The permit frequency reductions stated in this Section and in Appendix O do not affect the need or number of control tests to be undertaken as required in Appendix A of 252:606.
16. (d) In accordance with 252:730-5-10 and 252:730-5-16, no frequency reduction shall be allowed for bacterial limitations.
17. (e) Any control test undertaken in accordance with OAC 252:606, Appendix A, shall be reported on the DMRs as required by 40 CFR § 122.41 (l)(4)(ii), provided the control test sample meets all the sample protocol requirements as contained in the OPDES permit.

Added at 41 Ok Reg, Number 23, effective 9-15-24