Okla. Admin. Code § 252:606-6-91

Current through Vol. 42, No. 8, January 2, 2025

Section 252:606-6-91 - Performance-based monitoring frequency reductions and increases

(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.

(1) Except for ammonia, when a permittee has experienced:

(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.

(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.

(C) SNC violations for a parameter during the permit cycle, the permittee is:

(i) ineligible for a performance-based monitoring frequency reduction for that parameter for the ensuing permit cycle, and

(ii) a monitoring frequency increase is required in accordance with Table O-2 in Appendix O.

(2) Permittees may request toxicity-based ammonia limit monitoring frequency reductions according to 252:6066-26 or WET testing frequency reductions according to 252:606-6-42.

(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:

(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;

(B) it no longer exhibits reasonable potential (either from monitoring or effluent limit);

(C) there is a limit for that parameter in a previous permit that cannot be removed; and

(D) the parameter is not causing the receiving water body to be listed as a Category 5 water body in Oklahoma's Integrated Report.

(b) Performance-based monitoring frequency reductions shall not be based on a weekly average, a daily minimum or a daily maximum concentration limit.

(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.

(d) In accordance with 252:730-5-10 and 252:730-5-16, no frequency reduction shall be allowed for bacterial limitations.

(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.

Okla. Admin. Code § 252:606-6-91

Adopted by Oklahoma Register, Volume 41, Issue 23, August 15, 2024, eff. 9/15/2024