SECTION 252:690-3-91. 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 I-1 in Appendix I.

(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 I-2 in Appendix I.

(2)   Permittees may request toxicity-based ammonia limit monitoring frequency reductions according to 252:690-3-26 or WET testing frequency reductions according to 252:690-3-42.

(3)   The monitoring frequency for a metal may be reduced to once every six (6) 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 I 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 785:45-5-10 and 785:45-5-16, no frequency reduction shall be allowed for bacteriological 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.

[Source: Added at 19 Ok Reg 1721, eff 6-13-02; Amended at 24 Ok Reg 1542, eff 6-15-07; Amended at 28 Ok Reg 1316, eff 7-1-11; Amended at 30 Ok Reg 1097, eff 7-1-13]