2023-07-13_REVISION - C1981019

• Permit No: C1981019
• IBM Index Class Name: Revision
• Doc Date: 7/13/2023
• Doc Name: Application
• From: Tony Tennyson -Tri-State Generation and Transmission Association, Inc.
• To: DRMS
• Type & Sequence: SL22
• Email Name: ZTT
• Email Name: AME
• Media Type: D
• Archive: No

Table P -Annual Precipitation at the Colowyo Mine*, 2006-2022
]an Feb Mar Apr May Jun Jul AugSep Oct Nov Dec Total
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 0.71 0.78 0.81 13.54
2010 0.16 0.51 2.05 1.64 1.20 0.64 0.78 1.35 0.34 2.34 1.30 2.73 15.01
2011 0.55 1.18 1.96 3.45 2.59 0.93 1.38 0.96 1.09 1.38 0.90 0.38 16.74
2012 0.40 1.17 0.46 0.73 0.42 0.48 1.85 0.79 1.15 0.73 0.22 1.77 10.13
2013 0.43 0.45 0.45 2.25 1.54 0.00 1.26 0.60 2.93 1.96 1.24 0.60 13.69
2014 0.91 0.36 1.66 1.14 2.81 0.46 1.30 2.86 2.31 1.68 0.91 0.86 17.26
2015 0.27 0.93 0.88 1.91 3.24 0.59 1.87 0.57 0.52 0.79 1.29 1.51 14.34
2016 0.56 0.50 1.23 1.81 1.48 0.22 0.44 0.33 1.32 1.24 0.85 1.63 11.58
2017 1.63 1.80 1.31 1.31 1.79 0.69 2.34 0.38 1.95 2.03 1.02 0.14 16.36
2018 0.60 0.75 1.46 1.45 1.04 0.07 0.53 1.16 1.81 2.84 0.42 0.28 12.36
2019 1.37 1.02 2.98 2.47 1.55 3.30 0.78 0.22 0.44 0.30 0.78 1.49 16.70
2020 0.49 0.70 1.77 1.25 1.03 0.73 0.48 0.08 1.04 0.59 0.92 1.19 10.27
2021 0.48 0.80 1.04 0.25 1.17 1.65 0.50 1.50 1.28 1.80 0.25 1.90 12.60
2022 0.43 0.75 1.40 0.62 2.04 1.03 0.73 0.61 2.12 2.35 1.73 2.04 15.83
17 Year Avg. 0.74 0.87 1.49 1.59 1.67 0.86 1.06 1.03 1.75 1.66 0.93 1.28 14.94
Chart P1
Seasonal Precipitation(September-August)at the Colowyo Mine*,2005-2022
25
20 17 year average-14.94"
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Fall WinterIF Spring Summer
Chart P2-Seasonal Precipitation at the Colowyo Mine*
2021/2022 vs.17-Year Average
12
10 ❑17-Year Average
❑2021/2022
w 8
w 6 4.40 4.71 4.06
4 3.32 2.83 3.07 2.92 2.36
2
0
Fall Winter Spring Summer
*An average of data collected by Colowyo Weather Stations SCN16 and WSTPT prior to 2009,and then from stations SCN16 and SCN34
due to the relocation of WSTPT.
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