2013-04-10_GENERAL DOCUMENTS - C1981019

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patterns. Contour furrows will be constructed to reduce erosion. Overall, Colowyo's reclamation plan will serve to achieve contemporaneous reclamation and approximate original contour. However, a variance to Rule 4.14.1(1)(c) was granted during the initial permitting process to backfill as contemporaneously as practical in lieu of the 180 -day or four - spoil- ridges requirement. In conjunction with the approval of Permit Revision No. 2, the Division granted a variance to Rule 4.14.1(1)(c) for the South Taylor Pit. No reclamation will be completed during the current permit term (set to expire on November 5, 2012, currently in the permit renewal process) in the South Taylor pit area. The Division will hold adequate bond to ensure the completion of reclamation in the event of permit revocation and bond forfeiture. One large temporary fill (overburden) stockpile has been proposed for development of the Collom Lite and Little Collom X pits. This spoil pile is described in detail in Volume 15 Rule 2, pages 102 and 103; and Rule 4, pages 26 and 27. The feature is depicted on Map 23B - Mine Plan, Map 29B - Spoil Grading, and Map 29C - Temporary Spoil Pile Design. Volume 20, Exhibit 23, Item 1 provides the geotechnical report for the temporary pile. The current mine plan projects that the pile (estimated volume: 245,000,000 cu.yds.) will be constructed between 2013 and 2017. The spoil will be used in the final two years of mining (2032 -2033) to backfill the southern end of the Collom Lite Pit and restore the area to AOC. Topsoil Topsoil performance standards are found in Section 4.06 of the PAP (Volume 15 for Collom expansion). Variable topsoil depth replacement will be conducted in reclamation of the Collom expansion area. Variable topsoil depths will be replaced as shown on Map 28C. On ridge tops and slopes less than 10 %, approximately 4 inches of topsoil will be replaced to facilitate establishment of a Sagebrush Steppe plant community. On slopes greater than 10 %, a grassland community will established and topsoil replacement depths will vary from 6 inches at the interface with the Sagebrush Steppe community area grading to 36 inches or more at the bottom of the slope, with no topsoil replaced in the channel bottom. Revegetation Native and introduced forbs and grasses will be drill seeded or, on steep slopes, broadcast seeded. Ridge tops and slopes less than 10% will be seeded with the Sagebrush Steppe seed mix (Volume 15, Table 2.05 -9). Slopes steeper than 10% and drainage bottoms will be planted with the Grassland seed mix (Volume 15 Table 2.05 -7). Shrubs and tree species will be seeded, planted as bare root or containerized stock, or live planted. Revegetation efforts will be monitored to determine vegetative success as described in Section 4.15 of the PAP. Mulching is not in general use. Colowyo Coal Mine C1981 -019 PR -03 34 April 10, 2013