2013-05-20_REVISION - C1996083 ‎(2)‎

• Permit No: C1996083
• IBM Index Class Name: REVISION
• Doc Date: 5/20/2013
• Doc Name: Adequacy Response #3
• From: J.E. Stover & Associates, Inc
• To: DRMS
• Type & Sequence: TR75
• Email Name: SLB
• Email Name: SB1
• 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
May 16, 2013
Susan Burgmaier
Division of Reclamation, Mining & Safety
1313 Sherman St., Room 215
Denver, CO 80203
c0,40)
Mp`( 2p1p13
DP� pF�R 9
MO', '
Re: Bowie Resources, LLC, Bowie No. 2 Mine
Technical Revision Application No.75, Adequacy Response #3
Permit C -1996 -083
Dear Ms. Burgmaier:
CIVIL ENGINEERING
CONST. MANAGEMENT
The DRMS' email dated May 16, 2012 requested additional information. On behalf of Bowie
Resources, LLC, enclosed is the requested data.
Rule 4.10.4 Coal Mine Waste Banks- Construction Requirements
4. DRMS: The Division's initial review of the as -built topography provided with the TR -75
application indicated that portions of Gob Pile #4 were constructed with steeper slopes than
what was approved in the original design for the pile. On an attached map (attached hereon
for your reference), we identified areas of the slope that appeared to be between 2.OH:1 V
and 2.5H:1 V, and other areas that were steeper than 2.OH:1 V (blue -green areas).
BRL contracted Buckhom Geotech, Inc. to further examine the stability of the refuse area.
Buckhorn has conducted a revised as -built stability analysis, and determined that slopes as
steep as 2H:1 V will provide the required minimum factor of safety of 1.5. However, in the
conclusions section of the memo, Buckhom recommends "that the areas highlighted in the
DRMS letter of October 31, 2012 be surveyed to confirm the slopes in those areas. Any
areas steeper than 2H:1 V should be re- graded to achieve a slope with a minimum F.S. of 1.5
as required ".
BRL will need to ground -truth the contours of Figure 2 and identify and re -grade any
segments steeper than 2.0HAV, in order to achieve the required factor of safety. This
work must be completed and submitted to the Division before TR -75 can be approved,
and no cover material should be placed on Gob Pile #4 unil TR -75 has been approved.
BOW -2: The West half of Gob Pile #4 was regraded in February of 2013 and the slopes
met or exceeded the 2HA V standard established by BGI. Bowie was granted approval
for the grading work on the west half of the pile when TR -75 was approved on February
11, 2013. With the TR -75 approval, Stipulation No. 29 required grading of the east half
of the pile when weather conditions permitted.