2015-06-08_REVISION - C1996083

• Permit No: C1996083
• IBM Index Class Name: Revision
• Doc Date: 6/8/2015
• Doc Name: Adequacy Response # 2
• From: J.E. Stover & Associates, Inc
• To: DRMS
• Type & Sequence: TR98
• Email Name: JDM
• Email Name: DIH
• Media Type: D
• Archive: No

J. E. STOVER & ASSOCIATES, INC.
2352 NORTH 7T" STREEET, UNIT B
GRAND JUNCTION, COLORADO 81501
PHONE: [phone], FAX: [phone]
MINE ENGINEERING
MINE RECLAMATION
June 8, 2015
Jason Musick
Division of Reclamation, Mining & Safety
1313 Sherman St., Room 215
Denver, CO 80203
CIVIL ENGINEERING
CONST. MANAGEMENT
Re: Bowie Resources, LLC, Bowie No. 2 Mine
Technical Revision #98, Adequacy Response #2
Expand Gob Pile #2 footprint, design information for borrow areas
Permit C-1996-083
Dear Mr. Musick:
The DRMS' letter dated June 1, 2015 requested additional information. On behalf of
Bowie Resources, LLC, enclosed is the revised data.
Only one adequacy item remains outstanding and is shown below;
12. Division Response (June 5, 2015): Figure 2 and Map 21-3 were revised
to show the extension of the underdrain up the valley, as requested; however,
the text on the map directs that the extension will be made only if seeps are
encountered. This zone of Gob Pile #2 qualifies as a Valley Fill configuration,
bringing the requirements of Rule 4.09.2 into play. Subsection (2) of this rule
requires that subdrainage systems shall be constructed along the natural
drainage system, from the toe to the head of the fill. (Any associated lateral
drains are to be constructed if areas of seepage are found.) Please revise the
map text to show that the underdrain will be extended, as required.
BRL: It is unlikely groundwater is present in the area of gob pile #2, and
therefore, BRL hereby requests a variance for the extension of the underdrain as
required by Rule 4.09.2(2).
If present, the source of groundwater in a natural drainage channel would be
from infiltration into the colluvium material from snowmelt or precipitation
events.
However, when a channel segment is steep, very little infiltration will occur,
runoff flows at a high velocity which minimizes infiltration. The channel segment