Okla. Admin. Code § 252:740-11-1

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

Section 252:740-11-1 - Applicability and scope

(a) OAC 252:730-5-12(f)(2) provides that at no time shall heat be added in excess of the amount that will raise receiving water temperature more that 2.8 °C outside the mixing zone. Therefore, the temperature criterion will be implemented with respect to regulatory flow and reasonable potential at the maximum temperature on the edge of the mixing zone.

(b) OAC 252:730-5-26 provides generally to the effect that in streams the mixing zone encompasses 25% of the total flow. The mixing zone in lakes may be designated by the permitting authority on a case-by-case basis. To be consistent, the mixing zone used for numerical criteria implementation to protect fish and wildlife propagation from toxicity will be employed for temperature implementation in lakes. This mixing zone is defined to extend 100 feet into the lake from the source.

(c) Temperature implementation does not apply to privately owned cooling water reservoirs. Such reservoirs are specifically exempted in OAC 252:730-5-12(f)(2)(F) from implementation of temperature criteria to protect aquatic life. However, implementation of the antidegradation policy includes a maximum temperature (52 °C) which applies to all waters of the state including privately owned cooling water reservoirs. Privately owned cooling water reservoirs, however, that demonstrate no reasonable potential to exceed the antidegradation temperature shall not be limited in permits by such temperature.

(d) All calculations to implement temperature criteria shall be done in degrees Celsius (°C) at critical temperature conditions.

Okla. Admin. Code § 252:740-11-1

Adopted by Oklahoma Register, Volume 40, Issue 6, December 1, 2022, eff. 10/25/2022

Adopted by Oklahoma Register, Volume 40, Issue 24, September 1, 2023, eff. 9/15/2023