2009-03-27_REPORT - C1981019 ‎(7)‎

• Permit No: C1981019
• IBM Index Class Name: REPORT
• Doc Date: 3/27/2009
• Doc Name: 2008 AHR & ARR Exhibit 9A
• From: Colowyo Coal Company
• To: DRMS
• Annual Report Year: 2008
• Permit Index Doc Type: Hydrology Report
• Email Name: JRS
• Media Type: D
• Archive: No

Table P - Annual Precipitation at the Colowyo Mine*, 2001 - 2008
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Total
2001 0.5' 1.77 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 1.9.1 2.79 1.08 0.17 2.32 1.94 1.16 1.25 1.81 17.19
2001-2008 Avg. 1.05 1.26 1.57 1.72 1.33 1.13 1.25 1.04 2.62 2.15 1.57 1.06 17.74
Chart P
Seasonal Precipitation (September - August) at the Colowyo Mine*, 2001- 2008
25
20
c
0
15
'a
iJ
ILs 10
w
0
N
d
5 - 0
c
0
12
10
v 8 6.04
6
c
M
4
2
0
Seasonal Precipitation at the Colowyo Mine*
2007/2008 vs. 8-Year Average
4.43
3.06
Fall Winter
5.87
4.62
7
Spring
08 Year Avg.
02007/2008
3.42 3.56
11
Summer
Rio Tinto Energy America/Colowyo Mine Page 4 Revegetation Monitoring - 2008
N en It to F, w
O O O O O
.y N M O O 100 01
O
O O O O O
O O O d
Q
November February May August
October - January April July 06