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Settling and Polishin Tg anks <br />The Settling Tank and Polishing Tank are of the same size with dimensions of 8 feet by 26.75 feet by <br />4.75 feet high with total capacities of 1,000 cubic feet or 7,500 gallons each. The tanks are constructed <br />in the same manner as the Untreated Water Tank and are equipped with double liners and leak <br />detection. The treated water flows initially into the Settling Tank where the insoluble precipitate <br />formed by the addition of barium chloride and ferric sulfate settles into the bottom of the tank. To <br />insure complete separation of the solids from the treated water, the water gravity flows into the <br />Polishing Tank before being discharged. <br />8. Topsoil Stockpile Areas and Sediment Pond Excavation <br />Topsoil Stripping <br />Topsoil will be stripped from all areas prior to conducting mining or construction activities. This <br />includes both previously reclaimed areas and previously undisturbed areas. Pinyon pine, juniper, scrub <br />• oak, and any other small trees will be removed from previously undisturbed areas prior to stripping the <br />topsoil. These trees and other woody material will be placed in separate piles. During reclamation, <br />these materials will be placed on top of topsoiled areas, either as mulch or in whole pieces. <br />The Packrat Mine was reclaimed by importing alluvial soil from the Gateway area. The material was <br />used to cover the backfilled portal, regraded waste embankment area, and the access road. This <br />material will be stripped to the extent possible, but it is expected that only 4 to 6 inches of material will <br />be salvaged over an area of approximately 1.0 acres. This is a volume of 672 cubic yards, assuming an <br />average soil depth of 5 inches. Since there is no room at the Packrat portal area for storing this <br />material, the material will be used for the creation of the MSHA berm along the Packrat pad area and <br />access road. These berms will be seeded with the mix described in the reclamation plan to minimize <br />erosion. <br />The following areas of topsoil stripping correspond to the areas shown on map C-lA. <br />• <br />Whirlwind Mine 07 (rev. April 08) D-17 <br />