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GENERAL50503
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Last modified
8/24/2016 8:37:00 PM
Creation date
11/23/2007 6:01:05 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981044
IBM Index Class Name
General Documents
Doc Date
12/16/2003
Doc Name
Proposed Decision & Findings of Compliance for RN4
Permit Index Doc Type
Findings
Media Type
D
Archive
No
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The permit application contains an inventory of structures and renewable resource <br />lands within the permit area (Table 78 and Map 25). The applicant identifies three <br />private residences that aze within the permit area, but are outside the area <br />potentially affected by mining within the five-year permit plan area. The inventory <br />also identifies various mine facilities, an AMOCO oil pipeline, County Road 107 <br />(vacated to RAG Empire Corporation), State Highway 13, a Denver Rio Grande <br />and Western Railroad spur and irrigation ditches within the permit azea. <br />Renewable resource lands identified within the permit azea include the alluvial <br />valley floors of the Big Bottom area, the Yampa River and the Williams Fork <br />Rivers, the Yampa and Williams Fork Rivers themselves, and several bedrock <br />aquifers. <br />Subsidence predictions vary, depending upon the mining methods utilized. <br />Maximum predicted subsidence where two longwall panels overlap is 13.0 feet. <br />The extraction height for both E and F seams is 10 feet each. For locales where one <br />longwall panel underlies room-and-pillar workings, maximum predicted subsidence <br />is 10.5 feet. In azeas where only one seam has been mined using longwall methods, <br />maximum predicted subsidence is 7.5 feet. Further information can be found in <br />permit Section 2.05. While the mine is in active status, RAG Empire Corporation <br />has committed to submitting results of the monitoring program at least semi- <br />annually. Maximum total subsidence of 10 feet has been reported in the subsidence <br />reports. <br />The longwall panel 2 of Mine 6 was proposed to undermine the Amoco pipeline. <br />The predicted subsidence that could occur under this zone was estimated at 10.5 <br />feet, since this would involve one longwall panel under room-and-pillaz workings. <br />In lieu of subsiding the pipeline, the operator opted to relocate the pipeline and not <br />conduct full extraction of the coal within 100 feet horizontally of the pipeline. This <br />100-foot buffer will allow for an angle of draw calculated at 19°. This plan was in <br />agreement with the Amoco Pipeline Company and approved by the Division by <br />Minor Revision No. 24. <br />The operator also submitted a plan to undermine a portion of the railroad spur, the <br />Williams Fork alluvial valley floor, the Williams Fork River, and a portion of State <br />Highway 13. Further detail on this proposal can be located in Technical Revision <br />No. 19. The Division approved of development mining only under these resources, <br />with three additional subsidence monitoring locations along the highway, <br />The Division has previously found the permittee's subsidence control plan <br />complies with Rule 2.05.6(6) and the permittee has committed to adopt all <br />measures in order to reduce the likelihood of subsidence, prevent material <br />damage, or mitigate the effects. The Division has previously approved the <br />plan (4.20.1(2) and 4.20.3(1)). <br />2. The Division has previously found that the permittee's subsidence monitoring <br />program complies with Rule 2.05.6(6)(c), and is designed to determine the <br />33 <br />
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