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REP35724
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REP35724
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Entry Properties
Last modified
8/25/2016 12:13:06 AM
Creation date
11/27/2007 7:12:21 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981044
IBM Index Class Name
Report
Doc Date
10/9/1986
Doc Name
GEOTECHNICAL ADEQUACY EAGLE MINES PERMIT REVISION APPLICATION - 6MINE ADDITION PN C-81-044
From
MLRD
To
GREGG SQUIRE
Permit Index Doc Type
SUBSIDENCE REPORT
Media Type
D
Archive
No
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<br />five year permit period. However, the life-of-mine plan projects mining <br />beneath State Highway 13, the D&RGW Railroad Spur, and the Williams Fork and <br />Yampa rivers and their associated ylluvial valley floors. <br />Subsidence Inventory <br />1. Map No. 25, entitled "Structures and Renewable Resources", should be <br />amended to depict the boundaries of the Yampa and Williams Fork <br />alluvial valley floors. <br />Table 78, entitled "Inventory of Structures and Renewable Resource <br />Lands", indicates that subsidence is "Not Planned" for State Highway <br />13. The applicant states that it intends to subside •the Highway during <br />the life-of-mine, but not during the first five year permit period. <br />Table 79, entitled "Maximum Predicted Worst Case Subsidence for <br />Structures and Renewable Resource Lands", projects a maximum predicted <br />worst case subsidence of 6.0 feet for State Highway 13. The applicant <br />should correct or clarify this issue. <br />Description of Worst Possible Consequences <br />The application observes that the AMOCO Oil Pipeline night need repair <br />if affected by subsidence. While earlier mining plans for the Ho. 5 <br />mine included subsidence control components to protect the oil <br />pipeline, the plan under review does not. The application states, on <br />page 2.05,6(6)-13, that the pipeline might be affected by general <br />lowering of the ground surface with grade changes and surface <br />cracking. However, on page 2.05.6(6)-22, the applicant observes that <br />surface lowering and cracking have been observed above existing <br />longwall panes No. LW-1 & LW-2 in the No. 5 mine. 'Surface lowering <br />has reached a maximum vertical magnitude of 4.8 feet, while surface <br />cracks have reached widths of one foot with vertical offsets of up to <br />one foot. The applicant projects that "disruption of flow" might <br />occur, which would necessitate repair. The applicant. should elaborate <br />upon the potential environmental consequences of a "dlisruption of <br />flow". What sort of detection time is involved for remote pressure <br />sensing from Casper, Wyoming? How much leakage could) occur prior to <br />control and repair? What sort of clean up and repair activities would <br />be conducted? Who would be responsible for these efforts?. <br />2. County Road 107 would be undermined by the proposed mine plan. The <br />application states, on page 2.05.6(6)-13, that County Road 107 might be <br />affected by general lowering of the ground surface with grade changes <br />and surface cracking. However, on page 2.05.6(6)-22„ the applicant <br />observes that surface lowering and cracking have been observed above <br />existing longwall panels No. LW-1 & LW-2 in the No. !i mine. Surface <br />lowering has reached a maximum vertical magnitude of 4.8 feet, while <br />surface cracks have reached widths of one foot with vertical offsets of <br />up to one foot. The application observes that this road right-of-way <br />has been abandoned by the County. What sort of control is exerted by <br />the operator? Is the public conceivably exposed to a hazard? What <br />notice is afforded the public user? <br />
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