2012-04-02_REPORT - C1982057 (9)

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Topsoil Replacement. 59.4 acres of topsoil was replaced during 2011. Therefore, the total remaining mine disturbance area requiring topsoil (as of December 31, 2011) is 24.7 acres. Topsoil Replacement Thickness. The overall topsoil replacement thickness for the II -W disturbed area was originally projected to be 1.3 feet for the mine area and 0.7 feet for the Tie - Across Haul Road. The topsoil balance for the remaining disturbed area was calculated as follows: Mine Area Total Disturbance Area = 1,285.3 acres Permanent Facilities & Topsoil Replaced= 1,201.2 acres Disturbed area requiring topsoil = 84.1 acres Topsoil in stockpiles (Table 11.1) = 75.5 ac -ft Mean Replacement Depth = 0.9 feet (10.8 inches) Tie - Across Haul Road Total Disturbance Area = 96.6 acres Topsoil in stockpiles (Table 11.1) = 73.1 ac -ft Mean Replacement Depth — 0.7 feet (9 inches) REVEGETATION • Seeding and Shrub Planting Seeding. There were 59.4 acres (upland) seeded for the first time in 2011. Table 11.2 lists the approved seed mix for upland sites and ephemeral drainages. Seed tags from the seed bags used are contained in the attachment 2011 Seed Tags. Shrub Planting. There were 3,320 shrubs and trees planted along the Mine Entrance Road and around the shop area in 2011. The types and number planted included: Silver Sage 95 — Narrowleaf Cottonwood 500 - Coyote Willow 1,225 - Serviceberry (Mtn. and Utah) 500 - Chokecherry 500 - Aspen 500 • Monitoring ESCO Associates, Inc conducted revegetation monitoring of permanently revegetated areas and shrub establishment monitoring in the shrub plot areas during the summer and fall of 2011. The 2011 Annual Revegetation Monitoring Report will be submitted as a separate document. 2