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2012-07-10_GENERAL DOCUMENTS - C1981041
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2012-07-10_GENERAL DOCUMENTS - C1981041
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Last modified
5/19/2020 2:51:21 PM
Creation date
7/11/2012 8:35:51 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981041
IBM Index Class Name
General Documents
Doc Date
7/10/2012
Doc Name
Proposed Decision and Findings of Compliance (PR5)
From
DRMS
To
Snowcap Coal Company
Permit Index Doc Type
Findings
Email Name
MPB
SB1
Media Type
D
Archive
No
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pastureland are on previously undermined areas; the powerline has not been undermined (August <br />2003). Updated subsidence impact projections were provided in response to Division requests. <br />Projected worst case impact to the occasionally irrigated pastureland is localized dewatering of ponds <br />or ditches due to subsidence cracks, which the operator has committed to repairing if they develop. <br />Foundation floor cracking to the dwelling foundation and shop floor as a result of differential settling <br />were projected worst case impacts for these structures, which were constructed over a previously <br />mined out area. <br />Worst case impacts to the power line were projected to be minor tilting of transmission towers which <br />could be repaired by shimming under the legs or replacing deformed members, which the operator <br />indicated could be done without disruption of service. Mining beneath the powerline was to be <br />limited to development mining with no secondary extraction, resulting in an extraction rate of 49 %. <br />No definitive statement from the powerline owners documenting that potential worst case subsidence <br />damage to the powerline could be repaired without disruption of service was ever submitted. <br />However, South Portal mining operations ceased in 1997, prior to extension of workings to within the <br />subsidence angle of draw associated with the powerline. No further mining within the permit area is <br />proposed or approved. The South Mine Portals were sealed in 2000, and portal entries out -by the <br />seals were backfilled in 2007. The possibility of resumption of mining under Permit C -81 -041 is <br />essentially nil, and would at minimum require approval of a major permit revision. Stipulation No. 22, <br />previously attached to the permit, had required the operator to submit specific written documentation <br />from the powerline owners prior to mining within the subsidence angle of draw associated with the <br />powerline. Due to the fact that coal extraction operations have ceased and the portals have been sealed <br />and backfilled, the Division fmds that Stipulation No. 22 is no longer necessary or applicable, and the <br />stipulation was removed with RN -5 approval. <br />The Division fmds the subsidence control plan, as presented by Powderhom Coal Company within the <br />permit application document, to be in compliance with the subsidence - related regulations of Rules <br />2.05.6(6) and 4.20. <br />On October 31, 2007 the Division issued a proposed decision to approve a Release from Liability of <br />Areas Overlying Underground Workings (SL -3). Upon final approval of SL -3, reclamation liability <br />would be released on approximately 7,294 acres of the permit area, which currently (November 9, <br />2007) encompasses 10,310 acres. Over 2000 acres of land underlain by Permit C -81 -041 underground <br />workings are included in the area of proposed liability release; remaining lands proposed for release <br />were neither undermined nor affected by surface disturbances or facilities associated with Permit C- <br />81 -041. Please refer to the Division's October 31, 2007 Proposed Decision and Findings document <br />for SL -3, for further details. <br />XBI. Operations on Alluvial Valley Floors <br />The permittee's alluvial valley floor investigations in Section 2.06.8 of Tab 21, Volume 6, of the <br />application have been reviewed for compliance <br />There are three separate areas where alluvial valley floors must be assessed: <br />1. The surface facilities area and adjacent areas at the Roadside North and South Portals, and <br />Unit Train Loadout (UTL); <br />Permit Revision No. 5 51 July 10, 2012 <br />
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