2025-06-30_PERMIT FILE - C1981019

• Permit No: C1981019
• IBM Index Class Name: Permit File
• Doc Date: 6/30/2025
• Section_Exhibit Name: 2.04 Information on Environmental Resources
• Media Type: D
• Archive: No

RULE 2 PERMITS

Rule 2 Permits 2.04-42 Revision Date: 11/1/21
Revision No.: TR-150
Precipitation

Precipitation information for Craig and Meeker is shown in Table 2.04.8-1, Monthly Normals of
Temperature and Precipitation (1941-1970), in Table 2.04.8-2 Monthly Precipitation (1971-1979)
for Craig, Colorado and Table 2.04.8-3, Monthly Precipitation (1971-1979) for Meeker, Colorado.

Temperature

Temperature data for Craig and Meeker are presented in Table 2.04.8-1, Monthly Normals of
Temperature and Precipitation (1941-1970), in Table 2.04.8-4, Monthly Average Temperature
(1971-1979) for Craig, Colorado and in Table 2.04.8-5, Monthly Average Temperature (1971-
1979) for Meeker, Colorado. Based on data collected by the United States Department of
Commerce, the mean annual temperature of Craig is 42.4°F while the mean annual temperature at
Meeker is 44.2°F. Mean maximum and minimum monthly temperatures for both Craig and Meeker
are shown in Table 2.04.8-6, Temperature Summary - Means.

Wind

The synoptic flow in the area is characterized by prevailing westerly winds, which influence air
quality in the region. The direction and speed of the winds are greatly affected by the local
topography.

The general area contains two large drainage basins: the Yampa River Basin and the Williams
Fork River drainage system. The Yampa Valley forms a broad canyon which channels the airflow
into an east-west orientation reflecting upslope and downslope motion. Similar upslope-
downslope wind flow exists in the Williams Fork Valley. The flow draining this Valley is directed
northwardly along the high ground west of Craig prior to joining the main stream flowing up and
down the Yampa Valley at the end of the ridge.

The high frequency of near-calm conditions exists because of the protection afforded by the local
terrain in most of the valleys. These conditions generally occur at night and in the early morning.
The strongest winds in the area can be expected during the winter and early spring, especially in
March, and briefly during summer thunderstorms.

The prevailing winds over most of the permit area will be from the southwest at an average speed
of approximately 8 to 9 miles per hour; some 10 to 15 percent of the time the wind will blow out
of the northeast. Strong winds will occur due to cold fronts and thunderstorms moving through the
area, but fair weather winds will rarely exceed 20 to 25 miles per hour.

Meteorological Work at Colowyo

Site specific meteorology and total suspended particulate analyses for the Colowyo operation are
set forth in Exhibit 8, Air Quality Information under the title of "Report of Site Meteorology and
Total Suspended Particulate Studies." This one year baseline monitoring program was conducted
by Western Scientific Services, Inc. of Fort Collins, Colorado during 1976.