S.D. Admin. R. 74:29:05:08

Current through Register Vol. 51, page 34, September 9, 2024

Section 74:29:05:08 - Treatment of tailings

Treatment of the tailings shall continue until the effluent or pore water from the tailings impoundment meets the following criteria as determined by using a statistical method agreed upon by the department and the operator:

(1) Less than 0.5 mg/1 weak acid dissociable cyanide for operations which use cyanide in their milling or treatment process;

(2) For all other parameters, South Dakota drinking water standards in chapter 74:04:05, South Dakota surface water quality standards in chapter 74:51:01, or South Dakota groundwater quality standards in chapter 74:54:01, whichever is more appropriate based on a pathway and fate analysis;

(3) Other parameters of concern, as determined by the department, which are not specified in the South Dakota drinking water standards or South Dakota water quality standards, shall not exceed background concentrations as determined by baseline monitoring for potential receiving streams or groundwater, as applicable; and

(4) pH of 6.5 to 8.5.

If the criteria in this section prove to be inappropriate, alternate site-specific criteria based on a pathway and fate analysis may be developed by the department; and the board of water management may require that a state surface water or groundwater discharge permit be obtained in accordance with chapter 74:52:01 or 74:54:02, as applicable.

If future sampling according to the standards in this section proves treatment to be inadequate, other criteria may be specified by the department on a site-specific basis.

S.D. Admin. R. 74:29:05:08

14 SDR 111, effective 3/3/1988.

General Authority: SDCL 45-6B-81.

Law Implemented: SDCL 45-6B-44, 45-6B-45.