S.D. Admin. R. 74:52:06:01

Current through Register Vol. 51, page 67, December 16, 2024

Section 74:52:06:01 - Definitions

The following definitions are applicable to secondary treatment standards:

(1) "Seven-day average," the arithmetic mean of pollutant parameter values of samples collected in a period of seven consecutive days;

(2) "30-day average," the arithmetic mean of pollutant parameter values of samples collected in a period of 30 consecutive days;

(3) "BOD₅," the five-day measure of the pollutant parameter biochemical oxygen demand;

(4) "CBOD₅," the five-day measure of the pollutant parameter carbonaceous biochemical oxygen demand;

(5) "Effluent concentrations consistently achievable through proper operation and maintenance," for a given pollutant parameter, the 95th percentile value for the 30-day average effluent quality achieved by a treatment works in a period of at least two years, excluding values attributable to upsets, bypasses, operational errors, or other unusual conditions, and a seven-day average value equal to 1.5 times this value;

(6) "mg/L," milligrams per liter;

(7) "Percent removal," a percentage expression of the removal efficiency across a treatment plant for a given pollutant parameter, as determined from the 30-day average values of the raw wastewater influent pollutant concentrations to the facility and the 30-day average values of the effluent pollutant concentrations;

(8) "TSS," total suspended solids; and

(9) "Significantly more stringent limitations," BOD₅ and TSS limitations necessary to meet the percent removal requirements of at least five mg/L more stringent than the otherwise applicable concentration-based limitations.

S.D. Admin. R. 74:52:06:01

14 SDR 86, effective 12/24/1987; 19 SDR 122, effective 2/21/1993; transferred from

General Authority: SDCL 34A-2-30.

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