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

• Xbar
S
N
Nmin
Total Herbaceous Production
1985/1986/1987 Rec. Areas
63.20%
6.36
15
2
59.20%
5.65
15
2
The revegetation success criterion for total herbaceous production for the Keenesburg
Mine is a predictive equation based on cumulative precipitation amounts during the
period from September-July. The predictive equation for total herbaceous production is
y=0.3749x2.2485, where x is the cumulative amount of precipitation and y is the total
herbaceous production (in g/m2).
The total herbaceous production success criterion value for 2007 was calculated to be
165.33 g/m2 (based on 15.00" precipitation value).
Total Herbaceous Production (2007)
1985/1986/1987 Rec. Areas
1995/1997 Rec. Areas
229.27 g/m2
59.10
35
11
Xbar 239.46 g/m2
• S 57.21
N 25
Nmin 10
The total herbaceous production success criterion value for 2008 was calculated to be
39.66 g/m2 (based on 7.95" precipitation value).
Total Herbaceous Production (2008)
1985/1986/1987 Rec. Areas 1995/1997 Rec. Areas
Xbar 144.68 174.86
S 32.08 52.44
N 15 25
Nmin 9 16
•
1995/1997 Rec. Areas
Coors Energy Company Keenesburg Mine Page 4
Phase III Bond Release: 1985/1986/1987/1995/1997 Areas