2010-12-27_REVISION - C1981019 ‎(5)‎

• Permit No: C1981019
• IBM Index Class Name: Revision
• Doc Date: 12/27/2010
• Doc Name: Updated Dec 10 2009 Phase II Bond Release Evaluation
• From: Colowyo/Cedar Creek
• To: DRMS
• Type & Sequence: SL4
• Email Name: JRS
• Email Name: SB1
• Media Type: D
• Archive: No

An average of Colowyo Weather Stations SCN16 and WSrFT.
In 2009, the WSTFT station was moved to South Taylor, therefore it was replaced by Meteorological Station.
Inc. Page 3 Colowyo Coal Company
2009 Phase H Evaluation (Updated O -10)
Table P - Annual Precipitation at the Colowyo Mine -, 2001 - 2009
Jan Feb Mar Apr May Jun lul Aug Sap Oct Nov
Oec
Total
2001
0.53 1.27 1.15 1.10 1.76 0.68 0.96 0.90 1.01 1,19 1.19
0.68
12.50
13.51
2002
0.86 0.60 LV 1.12 005 oJ5 1.69 0.>7 2.69 1J1 1.59 0.56
2003
_0.91 2.73 2.95 2.05 1.57 0.52 0.19 0.93 1.03 0.25 284
3.47
17.44
17.70
2004
0.66 0.75 0.58 2 86 1.59 0.99 2 42 0.62 3.23 2.31 1.15
0.59
21.67
2005
1.97 1.24 1,59 2.59 201 4.50 045 1.19 1.35 2.60 154
0.64
21.15
2006
1.19 0.71 201 1.33 0.64 0.25 1 ,77 202 4.83 4.62 1.15 0.63
2007
1.21 150 1,54 0.92 1,67 0.30 1.27 0.89 4.18 2.38 1.60
2.84
20.22
2008
0.35 L24 114 1,94 2.79 108 0.17 2.32 1.99 1.16 1.28
181
17.19
2009'
1.32 0.31 Lan 1.67 i J9 2 42 0.33 0.59 0.85
11.24
2001 -2009 A.9.1
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 Colowyg Mine -, 2001- 2009
25
20
F9 year oval -
_ - _ _ _
_
3
15
30
0
5
0
o
aAU9 c
July
btt h ®S
�
r
Jun
Seasonal Precipitation at the Colowyo Mine'
2008/2009 vs. 9-Year Average
12
10 O9
year Avg.
0200812009
8
6.08 5.44
5
6 4.85
4'37 3.30 3.43 3.43
3.33
4
2
F F7
0
Fall Winter Spring Summer
An average of Colowyo Weather Stations SCN16 and WSrFT.
In 2009, the WSTFT station was moved to South Taylor, therefore it was replaced by Meteorological Station.
Inc. Page 3 Colowyo Coal Company
2009 Phase H Evaluation (Updated O -10)