The following are the street sanding specifications to be used in the Rapid City zone:

1. (1) A durability or hardness as defined in Mohs scale of greater than 6 for 70 percent of the material applied to the streets for deicing or skid control;

2. (2) No more than 3 percent of the total particle material content by weight may pass through a No. 200 sieve as described in ASTM C136-93, "Standard Test Method for Sieve Analysis of Fine and Course Aggregates," November 1993.

   For street sanding material, these criteria only apply to the material before the addition of salts or chemicals. Material of a lesser hardness may be used on inclined or curved roads for safety purposes or where it can be demonstrated that a material can provide at least a 25 percent reduction in air pollutants.

   References:

   Page 49 and 50, Physical Geology the Structure and Processes of the Earth, 1982, B. Clark Burchfiel, et al, Charles E. Merrill Publishing Company. Copies may be obtained from the Department of Environment and Natural Resources free of charge.

   Standard Test Method for Sieve Analysis of Fine and Course Aggregates, designation C 136-93, 4 pages, American Society for Testing and Materials, November 1993. Copies are available from ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959. Cost: $15.

Source: 22 SDR 104, effective February 11, 1996.

General Authority: SDCL 34A-1-6 , 34A-1-15.

Law Implemented: SDCL 34A-1-6 , 34A-1-15 , 34A-1-19 , 34A-1-38.