2009-03-16_REVISION - C1981028 ‎(4)‎

• Permit No: C1981028
• IBM Index Class Name: REVISION
• Doc Date: 3/16/2009
• Doc Name: Bond Release Application
• From: Savage & Savage
• To: DRMS
• Type & Sequence: SL4
• Email Name: JHB
• Media Type: D
• Archive: No

inspections have revealed concerns with protection of the hydrologic balance, protection
measures have been implemented and maintained.
• Notice to Parties Identified in Rule 3.03.2(1): Please see attached copies of letters and
certified receipts sent to specified parties. A copy of the letter to the Weld County Clerk
and Recorder, requesting retention of the public copy of the bond release application is
enclosed in this section.
Newspaper Advertisement: A copy of the newspaper advertisement to be published in
the Fort Lupton Press is attached. A copy of the proof of publication will be forwarded
for inclusion when received.
Achievement of Revegetation Success
The reports, 2007 Quantitative Vegetation Study, Phase III Bond Release [Year 1], Coors
Energy Company Keenesburg Mine, Keenesburg, Colorado, and 2008 Quantitative
Vegetation Study, Phase III Bond Release Wear 21, Coors Enemy Comnanv Keenesbure
Mine, Keenesburg, Colorado that document achievement of the applicable final
revegetation bond release criteria are appended to this application.
A summary of the applicable revegetation success criteria and sampled values for 2007
and 2008 for the Keenesburg Mine follows.
• Vegetation Cover
The revegetation success criterion for vegetation cover for the Keenesburg Mine is a
predictive equation based on cumulative precipitation amounts during the period from
September-July. The predictive equation for total vegetation cover is y=0.0173x3-
0.8592x2+14.562x-47.015, where x is the cumulative amount of precipitation and y is the
total percentage of live vegetation cover.
The vegetation cover success criterion value for 2007 was calculated to be 36.45% total
vegetation cover (based on 15.00" precipitation value).
Total Vegetation Cover (2007)
1985/1986/1987 Rec. Areas 1995/1997 Rec. Areas
Xbar 60.80% 61.40%
S 7.40 8.20
N 20 20
Nmin 4 5
The vegetation cover success criterion value for 2008 was calculated to be 23.13% total
vegetation cover (based on 7.95" precipitation value).
0 Total Vegetation Cover (2008)
Coors Energy Company Keenesburg Mine Page 3
Phase III Bond Release: 1985/1986/1987/1995/1997 Areas