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REV08325
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REV08325
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Entry Properties
Last modified
8/25/2016 1:08:58 AM
Creation date
11/21/2007 9:52:13 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980007
IBM Index Class Name
Revision
Doc Date
5/26/1987
Doc Name
WEST ELK COAL CO REQUEST FOR VARIANCE FROM RULE 4.10.4 4 FOR THE LOWER PERMANENT UNDERGROUNG DLPMNT
From
MLRD
To
SUSAN MOWRY
Type & Sequence
TR53
Media Type
D
Archive
No
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.~ <br />y III IIIIII III IIII III <br />~~~°`°~R STATE OF COLOI~v 9 <br />Roy Romer, Governor <br />DEPARTMENT OF NATURAL RESOURCES <br />MINED LAND RECLAMATION DIVISION <br />DAVID C. SHELTON, Director <br />DATE: May 26, 1987 <br />T0: Susan Mowry ~j <br />FROM: Tom Schreiner ~"- ` <br />RE: WEST ELK COAL COMPANY REQUEST FOR VARIANCE FROM RULE 4.10.4(4) FOR <br />THE LOWER PERMANENT UNDERGROUND DEVELOPMENT WASTE PILE AT THE MT. <br />GUNNISON N0. 1 MINE, FILE N0. C-81-007 <br />I have reviewed the proposal submitted in April by West Elk Coal Company <br />(WECC) fora variance from Rule 4.10.4(4) for their lower permanent <br />underground development waste pile. At this point in time, the Division does <br />not have sufficient information to approve the request by WECC to apply a <br />minimum cover of 6 - 12" on the waste pile. Information and data submitted in <br />the technical revision application does not conclusively support the <br />conclusion that revegetation success can De achieved on the Mt. Gunnison waste <br />pile by using less than four (4) feet of cover. Also, there was no <br />documentation that spontaneous combustion and erosion will be insignificant if <br />less than 4 feet of cover is used. <br />Information presented in the literature review does suggest that revegetation <br />success can be achieved on coal development waste piles in Colorado with less <br />than 4 feet of cover. However, revegetation success is site specific and <br />highly dependent on soil and overburden geochemistry as well as climatic <br />factors and plant adaptability. The small test plots at Mt. Gunnison <br />evaluated during 1980-1982 indicate general trends in applicability of various <br />seeding, seed mixture, and mulch treatments. Test plots evaluated do not <br />adequately address the issue of the most appropriate amount of cover needed to <br />achieve reclamation success. Nor do they address the issues of erosion or <br />spontaneous combustion. Results from the three year experiment, as presented <br />on Table 16, indicate that revegetation standards for cover and production <br />were not achieved and that production declined from 1980 to 1982, One would <br />not expect a significant decline in vegetative production on successful <br />reclamation. <br />Geochemical analysis and leachate tests of the overburden, coal processing <br />fires, and waste material in the pile indicates that there are no extremely <br />toxic or hazardous materials present that would affect revegetation. The pH <br />values are typically greater than 8.0 indicating alkaline conditions. The <br />SAR's are typically high (greater than 15); however, the total amount of <br />soluble sodium present is low to moderate. Sieve analysis indicates that only <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203-2273 Tel. (303) 866-3567 <br />
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