Okla. Admin. Code § 252:628-3-4

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

Section 252:628-3-4 - General IPR benchmarks

(a) CBOD₅ shall not exceed 5.0 milligrams per liter daily maximum and shallbemonitored inaccordance with minimum control test requirements for BOD₅ established in Appendix A of OAC 252:606. DEQ may increase the monitoring frequency for CBOD₅ 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.

(b) Flow shall be monitored continuously and recorded.

(c) pH shall be within the range of 6.5 standard units to 9.0 standard units and shall be monitored in accordance with minimum control test requirements established in Appendix A of OAC252:606. Where pH is monitored continuously, excursions from this pH range which are permitted in accordance with 40 CFRPart 401.17 shall not be subject to the requirements of OAC 252:628-3-10.

(d) TOC shall be monitored daily, or as approved by DEQ.

(e) TSS shall not exceed 5 milligrams per liter daily maximum and shall be monitored in accordance with minimum control test requirements established in Appendix A of OAC 252:606. Requirements for more frequent monitoring may be established on a case-by-case basis.

(f) Turbidity shall be monitored continuously. Continuous turbidity recording equipment shall be provided on the effluent piping and connected to an alarm system to warn operators of an excessive turbidity breakthrough. Turbidity shall meet the following:

(1) Turbidity shall not exceed a daily average of 2 NTU. The daily average turbidity is calculated as the average of turbidity measure stakenat intervals not to exceed 1.2 hours over a period of 24 hours;

(2) Turbidity shall not exceed 10 NTU at any time; and

(3) No more than 5% of the daily values shall exceed five (5) NTU per month. The maximum 24 hour turbidity shall be based on the highest measure from continuous monitoring taken at intervals not to exceed 1.2 hours over a 24 hour period.

Okla. Admin. Code § 252:628-3-4

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