REV10666

• Permit No: C1996083
• IBM Index Class Name: Revision
• Doc Date: 1/3/2007
• Doc Name: Response to Memo of 1/2/07
• From: Byron Walker
• To: Joe Dudash
• Type & Sequence: TR44
• Media Type: D
• Archive: No

i.~
STATE OF COLORADO
DIVISION OF RECLAMATION, MINING AND SAFETY
Department of Natural Resources
1313 Sherman St., Room 215
Denver, Colorado 80203
Phone: [phone]
FAX: [phone]
QTYkt10•AA D O
DIVISION OF
MINING
- &-
SAFETY
Bill Owens
Governor
Interoffice MEMORANDUM Russell George
Executive DireROr
Ronald W. Cattany
to: Joe Dudash (by a-mail) Division Director
from: Byron G. Walker Natural Resource Trustee
cc: Dan Hernandez, Sandy Brown (both by a-mail)
subject: Bowie No. 2 Mine, Permit Number C-1996-083, Bowie Resources LLC Technical
Revision No. 44, West Expansion of Gob Pile No. 2, Adequacy Review
date: January 3, 2007
This memorandum is in response to your request (memorandum of January 2, 2007, subject as above) for
review of adequacy responses and advice concerning a request by the applicant to start depositing coal
mine waste in Gob Pile 3 before the results of geotechnical investigations are available in support of
Technical Revision (TR) 44. A stipulation is proposed for the provision of the required geotechnical
investigations. The request for advance disposal is urgent as the applicant is running out of room in the
approved disposal sites. This memorandum is supplemental to my memorandum of November 6, 2006,
wherein the Division has asked, among other information, for geotechnical investigations of ground
underneath Gob Pile 3 in support of the application for the proposed new gob pile.
No site visit was made by me for this review. Materials reviewed include your memorandum of January 2,
2007; J. E. Stover & Associates, Inc letter of December 26, 2006; geotechnical logs of Gob Pile # I Hole
WBH-B1 and Gob Pile Number 2 Hole #9; Figure 2.1 and Figure 2 (11/10/03); and Figure I (12-11-06
and OS-16-OS); and photograph Nov 21, 2006. All materials supplied have been returned to your office.
The site has, from information provided by you, that the preparatory excavation work has been
accomplished. This work is illustrated on Figure 1, 05/16-05, of Technical Revision (TR) 43, and appears
in the photograph. You also advised, in your memorandum, that the applicant's consultant reported no sign
of springs or seeps in the excavated area.
Similaz materials are recorded in the drill logs of the two exploration holes mentioned above, WBH-Bl
and 9. These two holes bracket, on the east and one on the west, the proposed Gob 3 site. As such, and due
to the consistent geomorphology of the area, similar materials might be expected to be in the Gob 3 site. As
there are no springs or seeps in the area, I find it reasonable to permit restricted temporary placement of
coal mine wastes at the site pending approval of the design Gob 3 waste bank.
Restrictions should be (part of the stipulation):
I .that the elevation (height) of material over any portion of the site is not to exceed half the final design
surface elevation of the proposed waste bank (a factor of stability of 2 over the approved design), and in no
case be of greater elevation than the original (pre-disturbed) ground surface (i.e., no weight on any area
greater than that of the pre-disturbed site).
Office of
Mined Land Reclamation
Office of
Active and Inactive Mines