2010-03-12_REPORT - C1981019 ‎(8)‎

• Permit No: C1981019
• IBM Index Class Name: REPORT
• Doc Date: 3/12/2010
• Doc Name: 2009 AHR & ARR Section 9 ‎(2009 Revegetation Monitoring Report)‎
• From: Colowyo Coal Company
• To: DRMS
• Annual Report Year: 2009
• Permit Index Doc Type: Hydrology Report
• Email Name: JRS
• 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 - 17.67"
20
0
15 -
'a
'u
d
10
0
d
v 5
C
M
0
00/01 01/02 02/03 03/04 04/05 05/06 06/07 07/08 08/09 9-Year
Average
August
July
June
Seasonal Precipitation at the Colowyo Mine*
2008/2009 vs. 9-Year Average
12

10 08 Year Avg.
8 02008/2009
w 6.09
6 4.85 5.44
4 4.37
3.30 3.43 3.43 3.33
2 --]
IF

0 I

Fall Winter Spring Summer
* 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 4 Colowyo Mine
2009 Revegetation Monitoring Report