S.D. Admin. R. 74:29:11:54

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

Section 74:29:11:54 - Radiation standards for closure of surface facilities

For in situ uranium mine operations, closed surface facilities shall be considered suitable for release for unrestricted use if the following limits are not exceeded:

(1) The concentration of radium-226 or radium-228 in soil, averaged over any 100 square meters (m²), does not exceed the background level by more than 5 picocuries per gram (pCi/g) or 0.185 becquerel per gram (Bq/g), averaged over the first 15 centimeters (cm) of soil below the surface;

(2) The contamination of vegetation does not exceed 5 picocuries per gram (pCi/g) or 0.185 becquerels per gram (Bq/g), based on dry weight, for radium-226 or radium-228; and

(3) The concentration of natural uranium in soil, with no radioactive decay products present, averaged over any 100 square meters (m²), does not exceed the background level by more than 30 pCi/g or 1.11 Bq/g, averaged over the top 15 cm of soil below the surface, and 150 pCi/g or 5.55 Bq/g, average concentration at depths greater than 15 cm below the surface, so that no individual member of the public will receive an effective dose equivalent in excess of 0.1 rem (Roentgen equivalent man) per year or 1 millisievert (mSv) per year.

S.D. Admin. R. 74:29:11:54

33 SDR 160, effective 4/17/2007; 34 SDR 323, effective 7/2/2008.

General Authority: SDCL 34-21-15, 45-6B-81.

Law Implemented: SDCL 45-6B-43.