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April of 2007 revealed no springs or seeps; therefore, there is no water that could enter the waste <br />.~ from below and potentially compromise the stability of the embankment. Exhibit U presents a slope <br />stability analysis using commonly accepted basic equations and material parameters. The analysis <br />indicates that the waste embankment has a calculated safety factor above 2, which is well above the <br />minimum safety requirements for permanent slopes. <br />Runoff from the waste rock pile and other disturbed azeas will be collected in the sediment pond <br />shown on Map C-2. The sediment pond will allow suspended solids to settle out of solution before <br />the water enters the natural drainage. As an added precaution, the sediment pond water will be <br />tested for radium-226 and uranium, as well as other parameters on the standard DRMS surface <br />water list. For the first three years of the operation, sampling will be done once every six months. <br />For the remaining life of the mine, sampling will be done once per yeaz, unless the results provide <br />cause to increase the level of sampling (see Exhibit T for monitoring details). The sediment pond is <br />designed to fully contain the ten-yeaz, twenty-four-hour precipitation event for the site. It is also <br />designed to safely pass the 100-year, 24-hour storm event through the principal spillway pipe (see <br />Section 16 below). <br />• <br />6.Ore Stockpile Area <br />Ore will be end dumped directly onto the ore stockpile pad located north of the Whirlwind portal by <br />the buggies. The stockpile pad has been sized to contain up to 15,000 tons of ore, which represents <br />three to four months of full production. As shown on Map C-2, the ore pad covers approximately <br />0.5 acre and drains to a collection sump. Energy Fuels will compact the top 12 inches of the pad <br />area to 90% of the maximum dry density of the material as determined by Standard Proctor (ASTM <br />D-698). The sump will be equipped with an overflow that drains directly to the lined untreated <br />water pond that feeds into the water treatment plant. This overflow will utilize asix-inch diameter <br />HDPE pipe that will be buried at least eighteen inches below the surface from the sump to the Lined <br />Untreated Water Pond. <br />./ <br />Whirlwind Mine June 07 D-13 <br />