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2012-01-06_PERMIT FILE - C1982057 (33)
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2012-01-06_PERMIT FILE - C1982057 (33)
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Last modified
8/24/2016 4:47:13 PM
Creation date
2/14/2012 10:39:16 AM
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Template:
DRMS Permit Index
Permit No
C1982057
IBM Index Class Name
Permit File
Doc Date
1/6/2012
Section_Exhibit Name
Tab 21 Minesoil Reconstruction
Media Type
D
Archive
No
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Postmining topography and designs are discussed in further detail in Tab 20 and Tab 17. Seeding the topsoil • <br />stockpiles with an annual grain cover crop or native grasses and forbs, including vigorous rooting and <br />nitrogen Poring plants such as alfdHa, will be done to prevent erosion and also improve the fertility and <br />physical filth of the soil. The seed mixture, seeding method, and seeding rate for topsoil stockpiles is <br />described in the Revegetation Plan, Tab 22, Table 22-6. The topsoil removal area at any one time steal{ be <br />minimized to prevent both wind and water erosion. <br />SCC does not propose to use any selected overburden materials as topsoil substitutes or plant seedbed <br />media. This is based on resuRs of the soil survey and topsoil inventory for Seneca II-W. Sufficent quantities <br />of suitable quality topsoil are available to restore the disturbed areas to the desired postmine land use. <br />Following mining, an average of 1.3 feet of suitable topsoil will be replaced over the final graded spoil <br />medium. <br />No topsoil will be replaced on those facilities which are to be retained to compliment the final postmine land <br />use. These fadli[ies indude the high water line area and spillway of Ponds 005 and 006 (5.0 acres), and a <br />100-foot-wide section of the mine entrance road (19.5 acres), Road A (20.2 acres), Road G (21.8 acres), and <br />Road H (19.7 acres). <br />Research over the last ten years has demonstrated that topsoil depths required for optimum production are • <br />related to the quafrly of the underlying spoil, with greater depths of good quality soil needed to restore <br />production on poor quality spoil (U.S. Congress, 1986). Poor quality spoil material may require more than <br />three feet of topsoil replacement whereas good quality spoil may need less than one foot. In North Dakota, <br />the replacement of one foot of subsoil plus one foot of topsoil over good quality spoil materials is <br />recommended (Doll et al, 1984). Power et al., (1976) and Barth and Martin (1982) demonstrated that three <br />feet of topsoil was necessary for optimum production on sodic spoil. Barth and Martin, 1961, showed fine <br />sandy loam topsoil depths for optimum production in southeastern Montana to be less than one foot for <br />optimum perennial grass produdwn on nonsaline, nonsodic sift loam spoil. Schuman and others (1980) <br />found that native grass production on reclaimed spoil in Wyoming equaled forage production on an <br />undisturbed native area when the topsoil thickness was 1.3 feet. In northwestern <br />• <br />30 Revised 04!24!91 <br />
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