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PERMFILE135187
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PERMFILE135187
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Entry Properties
Last modified
8/24/2016 10:35:55 PM
Creation date
11/26/2007 3:10:44 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1996083A
IBM Index Class Name
Permit File
Doc Date
9/11/2006
Doc Name
TOC To End of Report (Geotechnical Engineering Study, Gob Pile, 11/10/03)
Section_Exhibit Name
Coal Mine Waste Disposal Area No. 2
Media Type
D
Archive
Yes
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Stabilitv Analvsis <br />See Lambert & Associates Geotechnical Engineering Study, Bowie No. 2 Mine, <br />Gob Pile, dated November 10, 2003 following this section. <br />Lambert's report dated November 10, 2003, determined the 230-foot high coal <br />mine waste disposal area would be stable with 2:1 slopes, horizontal to vertical, <br />with15 foot wide terraces on 50 foot intervals. The stability analysis was not <br />performed with strength parameters from the wash plant refuse because the <br />wash plant was not operating at the time. Therefore, the DMG placed stipulation <br />number 16 in the permit that required the Operator to determine site specific <br />strength parameters of the coal processing waste and demonstrate the proposed <br />fill, as approved, will be stable with a minimum factor of safety of 1.5. <br />Lambert's report dated March 17, 2005, which follows this section, explains they <br />developed representative site specific strength parameters for the in-place coal <br />processing waste. Their stability analysis performed with the site specific <br />strength parameters indicates the pile will be stable (1.5 FS) if the slope face <br />inclinations are flattened to 5:1. The stability analysis was run with the first 50 <br />foot in place with a 2.5:1 slope. The Operator flattened the face inclinations as <br />required to achieve the required 1.5 factor of safety. <br />The Operator commits to having a qualified third party geotechnical firm perform <br />monitoring and testing. Monitoring will consist of observations of the <br />geotechnical aspects of the construction to determine if any unusual or <br />unexpected conditions are encountered. Testing will include compaction tests <br />and periodic strength tests. Results of the tests and any observed unusual or <br />unexpected conditions will be submitted to the DMG with the quarterly inspection <br />reports. <br />• TR-43 <br />-13- <br />OSI06 <br />APPROVED <br />9/i l/0 6 <br />
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