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will be dumped into the expansion azea and graded to a maximum final slope of 3 horizontal to 1 <br />vertical (3H:1 V). Any waste rock hauled out of the Packrat Portal will be dumped into bins at the <br />Packrat Portal and then hauled to the Whirlwind waste embankment using lazger highway haul <br />trucks. <br />As shown on Map C-2, two ten feet wide benches will be placed on the final slope of the waste <br />embanlanent as it is constructed, to prevent vertical drops of more than thirty feet. In addition, a <br />haul mad with a six percent positive slope will be constructed as the embankment expands. This <br />road will be treated with magnesium chloride to minimize the generation of fugitive dust. Water <br />will be channeled away from the slope using a ditch on the inside of this road. The road and top of <br />the embankment will have a 3-foot high berm as required by MSHA for safety of the vehicle traffic <br />on the road. This berm will be made of either waste rock or topsoil salvaged from previously <br />reclaimed azeas. <br />Expansion of the waste rock pile will occur in increments of approximately four to five acres so that <br />a large portion of the azea will not be disturbed at once. As permanent waste rock slopes aze 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. All reclaimed slopes will be covered with a <br />minimum of twelve inches of topsoil prior to reseeding and mulching. Based on soil samples taken <br />in April of 2007, the average replacement thickness is 14 inches, which is used for all earthwork <br />and reclamation calculations. <br />Permanent diversions will keep undisturbed runoff from entering the waste rock embankment from <br />the uphill azeas to the south. Drainage of the waste rock embankment is discussed in Secfion 16. <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 <br />water. <br />•~ <br />Whirlwind Mine June 07 D-11 <br />