1988-04-29_PERMIT FILE - C1981008A (54)

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• TABLE 21-3 Projected Topsoil Salvage by Soil Map Unit for Mining Areas 2 and 3, 1988-1989, Nucla Mine, Montrose County, Colorado, February 1988 Topsoil Total Topsoil Map Unit Area Salvage Depth Volume Designation 1 (Acres) (Feet) (Ac.Ft.) Disturbed 12.27 - 1.943 2 1.30 0.75 0.98 4 0.15 1.00 0.15 5 0.13 1.42 0.18 64 3.81 0.50 1.91 74 1.29 0.58 0.75 84 4.41 0.42 1.85 94 1.49 0.67 1.00 10 1.17 1.00 1.17 • 11 2.33 0.00 0.00 124 0.67 0.00 0.00 13 0.90 0.00 0.00 TOTAL 29.925 - 9.93 1Map Unit Designation follows the 1986 Soil Survey in Attachment 9-4 to Tab 9 (Soil Survey-Scraper Pit, Mine Areas 2 and 3). 2Area currently disturbed which will require replaced topsoil/subsoil. This total does not include existing sediment ponds (2.3 acres) or existing and proposed topsoil stockpiles (2.5 acres), which, when combined, total 4.8 acres. 3Topsoil which currently exists in stockpiles. See Exhibit 21-1, Topsoil Balance Plan or Exhibit 12-2, Operations Plan, for locations and Table 21-1 for individual stockpile volumes. 4These soil map unit areas were disturbed by previous mining activity (pre-law and Permit 75-36) and subsequently reclaimed. 5The entire 29.92 acre area will be reclaimed to rangeland. A 6 inch topsoil replacement depth was previously approved for 22.88 acres within Mine Areas 2 and 3 under Permit 75-36. Therefore, a 6 inch topsoil/subsoil replacement depth over 3.5 feet of suitable spoil is • justified for these previously disturbed areas within Mine Areas 2 and 3. A 10 inch topsoil/subsoil replacement depth is justified for 7.04 acres of first time disturbance area within Mine Areas 2 and 3. The 6 and 10 inch topsoil/subsoil replacement areas are shown on Exhibit 21-2, Postmine Soil Replacement Depths. 21-14 Revised 08/19/88