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2013-05-10_REVISION - M1977193 (3)
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2013-05-10_REVISION - M1977193 (3)
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Last modified
6/15/2021 5:45:58 PM
Creation date
5/13/2013 7:49:04 AM
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Template:
DRMS Permit Index
Permit No
M1977193
IBM Index Class Name
REVISION
Doc Date
5/10/2013
Doc Name
Preliminary Adequacy Review Reponse.
From
Azurite, Inc.
To
DRMS
Type & Sequence
AM5
Email Name
TC1
TCW
Media Type
D
Archive
No
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z <br />benches. The topsoil and vegetative work will be much better utilized in the lower reaches of <br />the mining area where vegetative establishment is a more reasonable goal. <br />b) Storm water run -off from the highwall area can be more efficiently collected and directed <br />from the highwall benches to the lower storm ditch network and eventually to the large storm <br />water detention pond system in the north end of the affected land if topsoil /fines are not <br />placed on the mining benches. Sedimentation of the collection ditches will result in high <br />maintenance demands of the storm ditch system and tendency to plug during times of high - <br />intensity events. <br />c) The intent of the mining law is to promote site stability and impact control. This goal is <br />more readily achievable if the highwall benches are not a source of sediment loads during <br />storm events. The rock faces, if left in the configuration as shown in the attached drawing, <br />will best meet these requirements without attempting to revegetate the benches. The general <br />drainage direction of the toe -to -drain ditches located at the toe of each vertical face run will <br />be to the North to facilitate the overall site drainage to the north end of the affected land into <br />the Storm Water Management Plan containment area. <br />PROTECTING NEIGHBORING LAND AREAS FROM STORM FLOWS <br />Since the 1997 amendment, the proposed storm water management system has been fully <br />implemented and has performed effectively in diverting storm flows away from Tunnel Drive and <br />northwards to constructed detention ponds designed to hold up to a 10 -year storm event. The existing <br />storm water detention structures will be appropriate until mining has progressed below 5650' <br />elevation in areas that interrupt the current flow path to the retention ponds, 20 — 30 years hence. <br />Storm flow diversion and detention will continue through active mining and in perpetuity after <br />termination of mining operations. <br />FINAL RECLAMATION OF MAIN PIT AREA <br />The main pit area will not be re- vegetated until near to the life of the mine, approximately 70 <br />years from present. This is due to the fact that the mine pit will be in continuous use as product <br />stockpile, process, and load -out area. The storm water diversion ditch will also cross this area. <br />At the time of final reclamation, process fines will be used for planting medium and will be applied <br />at depths of 12 " -18 ". This material will be amended with organic materials (sewage sludge, manure, <br />or other materials that may be available) to achieve a planting medium that will support native <br />vegetation. An initial application of inorganic fertilizer of Nitrogen at 100 9/acre minimum and <br />Phosphorus at 80# /acre is anticipated prior to seeding. The seed mixture will be composed of the <br />following species: <br />
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