S.D. Admin. R. 74:52:06:03

Current through Register Vol. 51, page 54, October 28, 2024

Section 74:52:06:03 - Secondary treatment

The following limitations describe the minimum level of effluent quality attainable by secondary treatment:

(1) The BOD₅ 30-day average shall not exceed 30 mg/L, the BOD₅ seven-day average shall not exceed 45 mg/L, and the BOD₅ 30-day average percent removal shall not be less than 85 percent;

(2) At the option of the permitting authority, in lieu of the parameter BOD₅ at the levels of the effluent quality specified in subdivision (1) of this section, the parameter CBOD₅ may be substituted provided that the following conditions are met:

(a) The CBOD₅ 30-day average shall not exceed 25 mg/L;

(b) The CBOD₅ seven-day average shall not exceed 40 mg/L; and

(c) The CBOD₅ 30-day average percent removal shall not be less than 85 percent;

(3) The TSS 30-day average shall not exceed 30 mg/L, the TSS seven-day average shall not exceed 45 mg/L, and the 30-day removal shall not be less than 85 percent;

(4) The effluent values for pH shall be maintained within the limits of 6.0 to 9.0 unless the publicly owned treatment works demonstrates that:

(a) Inorganic chemicals are not added to the waste stream as part of the treatment process; and

(b) Contributions from industrial sources do not cause the pH of the effluent to be less than 6.0 or greater than 9.0.

S.D. Admin. R. 74:52:06:03

14 SDR 86, effective 12/24/1987; transferred from

General Authority: SDCL 34A-2-30.

Law Implemented: SDCL 34A-2-13, 34A-2-20.