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2014-12-30_REVISION - C1996083 (4)
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2014-12-30_REVISION - C1996083 (4)
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Entry Properties
Last modified
8/24/2016 5:56:16 PM
Creation date
12/30/2014 12:22:33 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1996083
IBM Index Class Name
Revision
Doc Date
12/30/2014
Doc Name
Adequacy Review - Geotechnical
From
Marcia Talvitie
To
Susan Burgmaier
Type & Sequence
TR97
Email Name
MLT
SLB
DIH
Media Type
D
Archive
No
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INTEROFFICE MEMORANDUM <br />Date: 30 December 2014 <br /> <br />To: Susan L. Burgmaier, Lead Specialist <br /> <br />From: Marcia L. Talvitie, P.E. <br /> <br />Subject: Bowie No. 2 Mine (Permit No. C-1996-083) <br /> TR-97 – Gob Pile #1 Slope Variance <br /> Adequacy Comments – Engineering / Geotechnical <br /> <br />As requested by Dan Hernandez in an Email dated December 5, 2014, I have reviewed the TR-97 <br />application, prepared by J.E. Stover & Associates on behalf of Bowie Resources, LLC (BRL). With TR-97, <br />BRL seeks approval for a variance from Rule 4.10.4(4). Alternative design specifications (in accordance <br />with Rules 4.09.1(3) and 4.10.1(1)(a)) are proposed for a portion of the already-constructed outslope of <br />Gob Pile #1. In May 2014, an area of approximately 0.1 acres on the southwestern side of the gob pile <br />was found to have a slope of 1.5h:1v, steeper than the 2h:1v allowed by 4.10.4(4) and approved in the <br />permit. <br /> <br />With the application, BRL submitted revised pages for two portions of the approved permit application <br />package. A new stability evaluation, dated November 21, 2014, has been prepared by Huddleston-Berry <br />Engineering & Testing, LLC (HBET). HBET evaluated the present configuration of Gob Pile #1, using <br />reasonable material parameters for native soils and compacted coal mine waste (gob). Geotechnical <br />investigations for the disposal site were conducted by other firms prior to construction of the pile. HBET <br />successfully addresses the pertinent requirements of 2.05.3(6)(b), (c) and (d) referenced by 4.09.1(3) for <br />alternative design specifications. I have no comments regarding the HBET Stability Evaluation for Gob <br />Pile #1. <br /> <br />In addition to reviewing the engineering and geotechnical aspects of TR-97, I have also prepared some <br />comments related to organization of the permit and formatting. <br /> <br />Volume IV Coal Mine Waste Bank <br />1. According to the TOC, Volume IV currently includes two separate reports: WesTec 1996 and <br />Lambert 1999. Revised pages 5 & 5i were submitted with the application. These pages appear <br />to be intended to revise/replace Page 5 of the June 1996 WesTec report. The cover page of that <br />report should be annotated to indicate that a portion was revised with TR-97 (and with TR-64), <br />as should that report’s entry in the TOC. (Modifying a portion of a document prepared and <br />certified by another party is not generally done; at a minimum, any revisions should be re- <br />certified by the party responsible for the changes.) <br /> <br />2. The 1999 Lambert report appears to address the question of stability for what is now known as <br />Gob Pile #1. If this is the case, it would make better sense to include the new HBET Analysis in <br />
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