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TR -18 to Permit M- 1977 -342 <br />Environmental Protection Plan <br />Evaporation rates exceed total precipitation rates. Nearby pan evaporation data is available <br />through WRCC for "Grand Lake 6 SSW" (8,367 feet AMSL, data from 1948 - 2005), and "Green <br />Mountain Dam" (7,903 feet AMSL, data from 1948 - 2005). Mean annual pan evaporation at <br />Grand Lake 6 SSW was 35.51 inches; average annual pan evaporation at Green Mountain Dam <br />was 31.90 inches. At both of these sites, all pan evaporation occurred between the months of <br />May and October. <br />A limited amount of data is also available via the hydrological and meteorological <br />instrumentation that has been installed and maintained by Henderson. Monitoring stations are <br />located at the Mine, Mill and Urad sites. These data are limited in scope and duration but help to <br />provide a secondary and more recent view of weather trends at all three locations. Data for these <br />three stations can be found in Tables 7 through 11. <br />Urad -1 Weather Station: This small station was established in December 2008 near the now - <br />closed Urad Mine. The instrumentation is installed on a tripod mount, within a fenced <br />compound. The wind sensor is mounted approximately 8 feet (2.5 meters) above ground level <br />(39° 45.546' North, 105° 49.383' West, 10,160 feet elevation ( +/- 20 feet)). Data from this <br />station includes monthly and daily air temperature, relative humidity and wind speed. The U -2 <br />Weather Station (39° 46'0.7536" North, 105° 49'3.0684" West) provides the monthly and daily <br />precipitation data applied to the Urad -1 Weather Station in Table 10 and Table 11. <br />Henderson Mill Weather Station: The Henderson Mill Weather Station was installed in August, <br />2010. Concrete foundations for the 10 -meter (33 -feet) aluminum tower, the tower lowering <br />device, and rainfall collector base were poured on the morning of August 9, 2010 and allowed to <br />cure for 24 hours before the tower was completely assembled and instrumentation installed on it. <br />Shortly after installation, a performance audit was carried out (39° 51.695' North, 106° 05.424' <br />West, 8,840 feet elevation ( +/- 20 feet)). Data from this station includes monthly and daily <br />precipitation, monthly barometric pressure, monthly relative humidity, monthly wind speed and <br />monthly air temperature. <br />Butler Gulch Weather Station: The Henderson Mine Butler Gulch weather instrumentation is <br />installed on a single (top) section of a standard aluminum tower. The wind sensor is mounted <br />approximately 10 feet (3 meters) above the ground level.(39° 46.155' North, 105° 51.275 West, <br />10,500 feet elevation ( +/- 20 feet)). Data from this station includes monthly wind speed and <br />monthly air temperature. <br />Climax Molybdenum Company <br />Henderson Operations <br />October, 2012 <br />Page 34 of 40 <br />