REV14988

• Permit No: C1980005
• IBM Index Class Name: Revision
• Doc Date: 10/4/2004
• Doc Name: 1st Adequacy Response
• From: Seneca Coal Company
• To: DMG
• Type & Sequence: TR36
• Media Type: D
• Archive: No

E
S CoMComaep Seneca Coal Company
September 30, 2004
Mike Boulay
Division of Minerals and Geology
1313 Sherman Street, Room 215
Denver, CO 80203
[phone]
RE: Seneca II Mine (Permit No. C-1980-005)
TR-361• Adequacy Response
Dear Mr. Boulay,
REC~~~~p
~~~ 0 Y 2004
Division of Minerals and Geology
Enclosed please fmd three (3) copies of revised and/or additional information for TR-36 addressing
the Adequacy Review comments in your August 2, 20041etter. The responses to each of the adequacy
comments are provided below and are numbered accordingly.
1. All of the SEDC.'AD demanrtrationr including the printoutr and channelr derignr refer to Seneca II-W throughout
the derign information ar opposed to Seneca II. Please rerubmit the printoutr and channel derigns suing the correct
reomenclatun.
Response: The SEDCAD printouts have been corrected and are included.
2. Pleare revue page 7-12-1 to include the nferencer to the new designed port mime channelr 6a, 66, 12a.
Response: Revisions have been made to page?-12-1 to include Channels 6a, 66, Ha, 8b, and IZa.
3. To be conrirtent with the other channel aesignr, pleare prosnde the rummary sheetr for Channels 6a and 66 in the
channel deri8n portion afAppendix B in Section 7-12.
Response: The Channel Summary sheet for SIIPM06 has been updated to include Channels 6a and
66.
4. Page 7-12-1, revised page 7-12-Sa, and Appendix C of Section 7-12 appear to contain incomplete information
with regard to culvert derign and rising. Page 7- 12-1 rhould accurately ident~ the culvertr evaluated as permanent
strudurer. Culvertr 2A and 3A are not rhown on revived Exhibit 7-19 and do not appear to be permanent
strudurxr, and Appendix C doer not contain the hydrauh~c calcu/ationr for al! culverXC Page 7-12-Sa it somewhat
misleading in that it appearr to indicate all culverts were riled wring the U.S. Bureau of Public Raadr nomograph.
Please venire pages 7-12-1 and 7-12-Sa according. Appendix C of Section 7-12 should aLro be revised and
updated I~egardlerr of whether a culvert is temporary orpermanenr, all culvertr arsonated with a light ure mad or
the permanent access roads shown on Exhibit 7-19 will require a hydmlagic derign and sin, ng information showing
that they will rafely parr the 10year, 24-haurpredpitation event. Further, page 7-12-156 showr four culverts bared
on the nomograph on page 7-12-157. Them it no hydmlagic demonriration indicating that there cnlvertr are designed
to rafely pass peak ranofffrom a 10-year, 24-hourpreoipitation event. The design flow and required diameter
information columnr contained on page 7-12-156 do not appear to be ruppated by hydraulic cakrelations. Please
Seneca Coal Company • P.O. Box 670 • Hayden, Colorado 87639
Telephone [phone] • FAX [phone]