S.D. Admin. R. 74:51:01:23

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

Section 74:51:01:23 - Bioassay methods

The toxicity of pollutants to aquatic life shall be based on bioassays which determine concentrations of a substance which at a defined period of exposure are toxic to aquatic life. Toxicity tests shall simulate expected receiving water conditions. Tests shall be conducted according to test procedures approved or methods given in the references listed in 40 C.F.R. Part 136 (July 1, 2020), guidelines for establishing test procedures for the analysis of pollutants.

The term, acute, means a stimulus severe enough to rapidly induce an effect. In aquatic toxicity tests, a deleterious response (e.g., mortality, disorientation, immobilization) to a stimulus observed in 96 hours or less is considered acute. When referring to aquatic toxicology or human health, an acute effect is not always measured in terms of lethality.

The term, chronic, means a stimulus of the lowest concentration of a constituent causing observable effects. In aquatic toxicity tests, observable effects may include lethality, reduced growth, or reduced reproduction, usually a four- to seven-day test.

S.D. Admin. R. 74:51:01:23

SL 1975, ch 16, § 1; 4 SDR 32, effective 12/4/1977; transferred from § 34:04:02:06, effective 7/1/1979; 10 SDR 145, effective 7/4/1984; 13 SDR 129, 13 SDR 141, effective 7/1/1987; 14 SDR 86, effective 12/24/1987; 19 SDR 111, effective 1/31/1993; transferred from § 74:03:02:06, July 1, 1996; 24 SDR 10, effective 7/20/1997; 35 SDR 253, effective 5/12/2009; 41 SDR 109, effective 1/12/2015; 47 SDR 110, effective 4/27/2021

General Authority: SDCL 34A-2-11, 34A-2-93.

Law Implemented: SDCL 34A-2-10, 34A-2-11.