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Permit M77-424 Amendment 1 <br />EXHIBIT K <br />CLIMATE <br />Exhibit K <br />Page 1 of 1 <br />An in-depth description of the climate present in the affected area is given in Exhibit K of <br />the original permit. This description includes air movement patterns, air temperatures, <br />particulate matter, radiological contaminants, land (soil depth and structure and soil <br />erosion), and water (hydrologic cycle). <br />In brief, the affected azea occupied by the water transmission pipeline and evaporation <br />pond spans an elevation from about 7,700 feet above mean sea level (amsl) at the portal <br />to about 5,500 feet amsl at the evaporation pond. As stated in the original permit, the <br />climate is a typical mountainous steppe climate with an annual range in high and low <br />temperatures that can exceed 130 F with a daily or diurnal range of 30 F to 40 F. <br />Midsummer temperatures average approximately 70 F with a range of 60 F to 100 F. <br />As also stated in the original permit, precipitation ranges from 8.5 inches below 5,000 <br />feet to 24 inches above 8,000 feet. Precipitation generally occurs in the form of rain or <br />snow and falls approximately 45 days per year. Snowfall occurs on an average of 20 <br />days per year with accumulations up to 100 inches (more recently observations show <br />snowfall has not exceeded 36 inches on the mine benches). In the canyons below 7,000 <br />feet, snow may reach 24 inches in depth, but the ground is rarely covered with snow for <br />more than a few days a year. Above 7,000 feet snow depth may reach 6 feet. <br />