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• maximum of 2 feet in diameter. As the waste rock is brought outside in the buggies, it will be dumped <br />into the expansion area and graded to a maximum final slope of 3 horizontal to 1 vertical (3H:1 V). <br />Any waste rock hauled out of the Packrat Portal will be dumped into bins at the Packrat Portal and then <br />hauled to the Whirlwind waste embankment using larger highway haul trucks. <br />As shown on Map C-2, two ten feet wide benches will be placed on the final slope of the waste <br />embankment as it is constructed, to prevent vertical drops of more than thirty feet. In addition, a haul <br />road with a six percent positive slope will be constructed as the embankment expands. This road will <br />be treated with magnesium chloride to minimize the generation of fugitive dust. Water will be <br />channeled away from the slope using a ditch on the inside of this road. The road and top of the <br />embankment will have a 3-foot high berm as required by MSHA for safety of the vehicle traffic on the <br />road. This berm will be made of waste rock. <br />Expansion of the waste rock pile will occur in increments of approximately three to four acres so that a <br />large portion of the area will not be disturbed at once. As permanent waste rock slopes are created, <br />• topsoil from new disturbance areas will be placed on the regraded slopes and seeded to allow for <br />contemporaneous reclamation of a portion of the pile. The work will be completed during the fall <br />seeding window (August to October 15). All reclaimed slopes will be covered with a minimum of <br />twelve inches of topsoil prior to reseeding and mulching. Based on soil samples taken in April of 2007, <br />the average replacement thickness is 14 inches, which is used for all earthwork and reclamation <br />calculations. <br />Permanent diversions will keep undisturbed runoff from entering the waste rock embankment from the <br />uphill areas to the south. Drainage of the waste rock embankment is discussed in Section 18. <br />Recent samples of the ore and waste from newly exposed underground faces were taken by Energy <br />Fuels. These samples were analyzed for chemical content and then tested using the Synthetic <br />Precipitation Leaching Procedure (SPLP), which is the Division's recommended procedure for <br />determining whether mine waste has the potential to environmentally impact ground or surface water. <br />• <br />Whirlwind Mine 07 (rev. April 08) D-12 <br />