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2010-05-07_PERMIT FILE - C2009087 (7)
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2010-05-07_PERMIT FILE - C2009087 (7)
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Last modified
8/24/2016 4:11:40 PM
Creation date
5/26/2010 11:14:36 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C2009087
IBM Index Class Name
Permit File
Doc Date
5/7/2010
Doc Name
Climatological Information
Section_Exhibit Name
2.04.8 Climatological Information
Media Type
D
Archive
No
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RULE 2 - PERMITS <br />• 2.04.8 Climatological Information <br />This section of the permit application describes general climatic conditions in the vicinity of the <br />PSCM permit and adjacent areas as a basis for understanding and evaluation of mining - related <br />impacts and development of appropriate operation, reclamation, and restoration plans. Most of the <br />information presented in this section is based on historical records and information from the closest <br />active meteorological stations providing temperature, precipitation, and wind data. These data <br />provide a reasonable representation of site climatic conditions because these stations are located in <br />reasonable proximity to the PSCM permit area at similar site elevations (see Map 2.04.7 -M1, <br />Hydrology). <br />General Climatology and Environment <br />Routt County, where the PSCM permit area is located, has surface elevation ranges from 6,400 feet <br />at the western border of the county along the Yampa River valley to over 12,100 feet at Mt. Zirkel. <br />Terrain elevations within five to ten miles of the PSCM permit area range from 6,600 to 7,800 feet. <br />The PSCM permit area has a highland semiarid climate, with altitude and exposure being the <br />predominant influences. However, there are four distinct seasons. Arctic air masses from northern <br />Canada or warm, sometimes humid, southerly airflow from the Gulf of California and northern <br />Mexico will be transported without significant modification into the PSCM permit area, causing <br />intermittent periods of unexpectedly cold or warm temperatures. Winter nighttime temperatures in <br />this region can be quite cold near intervening river valleys subject to temperature inversions that <br />• trap cold air within their confines. However, winter daytime temperatures can be relatively mild <br />due to significant warming along nearby exposed southern slopes during sunny days. <br />The north -south orientation of the mountain ranges in Routt County contributes to orographic <br />enhancement of precipitation as the prevailing westerly airflow is lifted up and over the ridges. <br />Winter storms often lead to large accumulations of snowfall over one to three day periods, but <br />severe blizzard conditions such as found on the Great Plains are very rare. This mountainous terrain <br />also plays a role in summer precipitation. Solar heating and evapotranspiration from forested slopes <br />facing the sun hasten the development of cumulus clouds and rain showers. Summer months are <br />characterized by these afternoon showers, some of which produce thunder and lightning but rarely <br />cause extreme severe weather. Local variations in precipitation may be pronounced dependent on <br />topography, exposure, and orientation relative to prevailing wind direction. Variations in exposure <br />may result in higher wind velocities on ridges when compared with lower slope, basin, and valley <br />areas. However, natural up- valley and down - valley airflow patterns resulting from convective <br />heating and cooling can also result in strong surface winds in valley areas. Overall, winds will vary <br />by location, winters are relatively mild considering site elevation, with significant snow <br />accumulations, and summers are cool with afternoon showers. <br />Temperature <br />The four closest meteorological stations recording temperature data are located at Hayden, <br />Steamboat Springs, and at a project site (i.e., Seneca II W) near the old Seneca II W Coal Mine. In <br />addition, an on -site meteorological station (i.e., Sage Creek) has recently been installed in the Mine <br />• permit area (see Map 2.04.7 -M1, Hydrology) and analyzed data are available for November, 2008 <br />through October, 2009. Hayden is located approximately 11 miles to the northwest, Steamboat <br />PSCM Permit App. 2.04 -109 Revision 12/17/09 <br />
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