Okla. Admin. Code § 252:628-3-5

Current through Vol. 41, No. 19, June 17, 2024

Section 252:628-3-5 - IPR primary benchmarks

(a)Primary benchmarks. IPR Source Water shall be treated to meet the primary benchmarks established in Appendix A of this Chapter in accordance with the following:

(1)Non-conservative parameters. Refer to Appendix A of this Chapter for the list of primary non-conservative parameters.

(A) Primary benchmarks shall apply at end of pipe.

(B) Effluent limitations and monitoring requirements shall be established in the permit for those parameters with primary benchmarks which are demonstrated or believed to be present in the IPR Source Water discharge based on information in the OPDES discharge permit application or other available data.

(C) The primary benchmarks for parameters identified in this paragraph shall be applied as daily maximum permit limits in the OPDES discharge permit. Monthly average permit limits shall be established as two-thirds times the daily maximum permit limits.

(2)Conservative parameters. Refer to Appendix A of this Chapter for the list of primary conservative parameters.

(A) Primary benchmarks shall apply at end of pipe.

(B) An HMB model or equivalent analysis covering the entire period of record may be performed in order to establish a tiered system for effluent loading that ensures the concentration for conservative parameters in the lake do not exceed the greater of the primary benchmark or the existing ambient concentrations absent the discharge.

(C) Effluent limitations and monitoring requirements shall be established in the permit for those parameters with primary benchmarks which are demonstrated or believed to be present in the IPR Source Water discharge based on information in the OPDES discharge permit application or other available data.

(D) All beneficial uses in the receiving water body shall be maintained and protected during drought of record conditions.

(b)No mixing zones. No mixing zones or dilution factors shall be allowed for establishing effluent limitations based on IPR primary benchmarks.

(c)Effluent monitoring requirements. The following effluent monitoring requirements apply:

(1) Parameters with primary benchmarks which are included in the permit shall be monitored at the following minimum frequencies:

(A) Disinfection By products, Metals and Inorganics, Organics: Twice a month;

(B) Nutrients: Weekly during the period of May through October and twice a month during the period of November through April;

(C) Pesticides: Monthly; and

(D) Radionuclides: Every five (5) years upon permit renewal, in accordance with permit application requirements.

(2) DEQ may increase the monitoring frequencies listed in (c) of this Section for a period not to exceed two years during the initial permit cycle for the purpose of establishing the pattern and extent of variation for a given pollutant.

Okla. Admin. Code § 252:628-3-5

Adopted by Oklahoma Register, Volume 35, Issue 24, September 4, 2018, eff. 9/15/2018