2011-01-19_REVISION - C1981019 ‎(7)‎

• Permit No: C1981019
• IBM Index Class Name: REVISION
• Doc Date: 1/19/2011
• Doc Name: Updated 2011 2009 Phase III Bond Release Evaluation - Year 2
• From: Colowyo Coal Company
• To: DRMS
• Type & Sequence: SL5
• Email Name: JRS
• Email Name: SB1
• Media Type: D
• Archive: No

Table P - Annual Precipitation at the Colowyo Mine*, 2001 - 2009
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total
2001 0.53 1.27 1.15 1.18 1.76 0.68 0.96 0.90 1.01 1.19 1.19 0.68 12.50
2002 0.86 0.60 1.17 1.12 0.05 0.75 1.69 0.77 2.69 1.71 1.54 0.56 13.51
2003 0.91 2.73 2.95 2.05 1.57 0.52 0.19 0.93 1.03 0.25 2.84 1.47 17.44
2004 0.66 0.75 0.58 2.86 1.59 0.94 2.42 0.62 3.23 2.31 1.15 0.59 17.70
2005 1.97 1.24 1.59 2.59 2.01 4.50 0.45 1.19 1.35 2.60 1.54 0.64 21.67
2006 1.19 0.71 2.01 1.33 0.64 0.25 1.77 2.02 4.83 4.62 1.15 0.63 21.15
2007 1.21 1.50 1.54 0.92 1.67 0.30 1.27 0.84 4.18 2.38 1.60 2.84 20.22
2008 0.35 1.24 1.14 1.94 2.79 1.08 0.17 2.32 1.94 1.16 1.28 1.81 17.19
2009+ 1.32 0.31 1.99 1.67 1.79 2.42 0.33 0.59 0.85 - - - 11.24
2001-2009 Avg. 1.00 1.15 1.57 1.74 1.54 1.27 1.03 1.13 2.35 2.03 1.54 1.15 17.48
Chart P
Seasonal Precipitation (September - August) at the Colowyo Mine*, 2001- 2009
25 - - _
9 year average - 17.48"
20
- - - - - - - - - - - - - - - - - - - - -
C
0
19
'a
'v
d
d 10 -
0
VA
X 5 - - -
c
M
0
12 -
30
d 8 6.09
v 6
c
4
2
0
Seasonal Precipitation at the Colowyo Mine*
2007/2008 and 2008/2009 vs. 9-Year Average
4.37 3.30 4.43 3.43
Fall Winter
* An average of Colowyo Weather Stations SCN16 and WSTPT.
+ In 2009, the WSTPT station was moved to South Taylor, therefore it was replaced by Meteorological Station.
CEDAR CREEK ASSOCIATES, Inc. Page 3 Colowyo Coal Company
2009 Phase III Bond Release Evaluation