REV06355

• Permit No: C1994082
• IBM Index Class Name: Revision
• Doc Date: 12/10/2003
• Doc Name: Revised Page Letter/Response to Adequacy Comments
• From: Seneca Coal Company
• To: DMG
• Type & Sequence: TR24
• Media Type: D
• Archive: No

E~~i4
S Cva/ Company
December 12, 2003
Mr. Michael Boulay
Division of Minerals and Geology
1313 Sherman Street, Room 215
Denver, CO 80203-2273
RE: Seneca Yoast Mine Permit C-94-082,
TR-24 -Response to Adequacy Cotments
Deaz Mr. Boulay:
Seneca Coal Company
FiECEI\/ED
DEC 1 0 2003
Division of PAinerals and Geolog~~
Enclosed please fmd three copies of revised and/or additional information for TR-24 addressing the
Adequacy Comments in your November 4, 2003 letter. The responses to each of the adequacy
comments are provided below and aze numbered accordingly.
1. No foundation information war found in the application for proposed Pond O11A. In accordance with Rule
4.05.9(6), please include information on the foundation condition at the dam rite that influences the design and
stability of the dam.
Response: The information requested is included in the enclosed Attachment 13-18, Sedimentation
• Pond O11A Stability Analysis.
2. Na companion rpetiftcation way found in the application for the Pond 011A embankment. In attordante with
Rule 4.05.9(7)(x), please include a companion specification in the design report for the dam.
Response: The information requested is included in the enclosed Attachment 13-18, Sedimentation
Pond 011A StabilityAnalysir.
3. The upstream dope of the embankment it not indicated an Drawing 13-SB. Pleare indicate the upstream dope of
the Pond 011A embankment on Drawing 13-SB. The combined upstream and downstream doper should not
exceed Sh:1 v.
Response: Exhibit 13-SB has been updated to indicate a 3H:1 V slope on the upstream side of the
embankment. Therefore the combined upstream and downstream slopes equals 6H;1V.
4. Pleare include a stability analysis that demanytrater that the proposed embankment has a safety favor of 1.3 in
accordance with Rule 4.05.9(8)(6). Pleare indicate the source of conrtrunion materials, embankment and
foundation .roily, and engineering strength charanerirthy.
Response: The information requested is included in the enclosed Attachment 13-18, Sedimentation
Pond O11A Stability Anafysis.
5. There is no protection of the (inside) doper of the embankment indicated m the submittal. Pleare revise the
application to indicate the pratenion provided to the inslope or upstream face of the embankment so as to fully
comply with Rule 4.05.9(9).
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