HOME    SEARCH    ABOUT US    CONTACT US    HELP   
           
Rule: 17.24.515 Prev     Up     Next    
Rule Title: HIGHWALL REDUCTION
Add to My Favorites
Add to Favorites
Department: ENVIRONMENTAL QUALITY, DEPARTMENT OF
Chapter: RECLAMATION
Subchapter: Strip and Underground Mine Reclamation Act: Backfilling and Grading Requirements
 
Latest version of the adopted rule presented in Administrative Rules of Montana (ARM):

Printer Friendly Version

17.24.515    HIGHWALL REDUCTION

(1) Highwalls must be eliminated and the reduced highwall slope must be no greater than whatever slope is necessary to achieve a minimum long-term static safety factor of 1.3. The department may specify a lesser slope whenever necessary to achieve postmining slope stability. Highwall reduction must be commenced at or beyond the top of the highwall and sloped to the graded spoil bank.

(2) Highwall reduction alternatives may be permitted only to replace bluff features that existed before mining and where the department determines that:

(a) postmining bluffs are compatible with the proposed postmining land use;

(b) postmining bluffs are stable, achieving a minimum long-term static safety factor of 1.3;

(c) similar geometry and function exists between pre- and postmining bluffs;

(d) the horizontal linear extent of postmining bluffs does not exceed that of the premining condition; and

(e) highwalls will be backfilled to the extent that the uppermost mineable coal seam is buried in accordance with ARM 17.24.505(1) .

History: 82-4-204, 82-4-231, MCA; IMP, 82-4-232, MCA; NEW, 1980 MAR p. 725, Eff. 4/1/80; AMD, 1989 MAR p. 30, Eff. 1/13/89; TRANS, from DSL, 1996 MAR p. 3042; AMD, 2004 MAR p. 2548, Eff. 10/22/04.


 

 
MAR Notices Effective From Effective To History Notes
10/22/2004 Current History: 82-4-204, 82-4-231, MCA; IMP, 82-4-232, MCA; NEW, 1980 MAR p. 725, Eff. 4/1/80; AMD, 1989 MAR p. 30, Eff. 1/13/89; TRANS, from DSL, 1996 MAR p. 3042; AMD, 2004 MAR p. 2548, Eff. 10/22/04.
Home  |   Search  |   About Us  |   Contact Us  |   Help  |   Disclaimer  |   Privacy & Security