(a)  Effluent limitations more stringent than minimum treatment requirements shall be developed by the staff and approved by the Director for all existing or proposed dischargers to water quality limited segments of the surface waters of the state.  The basis of these water quality effluent limitations shall be maintenance of water quality standards.

(b)  The staff shall also provide on a case‑by‑case basis for seasonal variation in the discharge of oxygen‑consuming wastes.  In order to be considered eligible for seasonal effluent limitations, a request must be submitted to the Director along with a rationale as to the need for such limitations.  Permit reissuance or modification during the remaining time of an existing permit will be considered on the basis of demonstrated need. In no case shall this variation cause or be expected to cause a receiving water body to violate applicable water quality standards.

(c)  For the purpose of determining seasonal effluent limitations, the year shall consist of a summer and a winter discharge period.  The summer period will begin April 1 and extend through October 31.  The winter period shall be that portion of the year from November 1 to March 31.  The summer oxygen‑consuming wasteload allocation shall be developed using the flow criteria specified in 15A NCAC 2B .0206.  The winter oxygen‑consuming wasteload allocation shall in no case be less stringent than two times the summer oxygen‑consuming waste load limitations nor shall it be less restrictive than minimum treatment requirements.


History Note:        Authority G.S. 143‑215; 143‑215.1; 143‑215.3(a)(1);

Eff. February 1, 1976;

Amended Eff. August 12, 1979.