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COLOWYO COAL COMPANY <br />SECTION 1- INTRODUCTION <br />Rills and gullies which form in areas that have been regraded and topsoiled which either <br />(1) disrupt the approved postmining land use or the reestablishment of the vegetative <br />covers or (2) cause or contribute to a violation of water quality standards for receiving <br />streams will be identified during the spring of each year. Regraded and topsoiled areas <br />will be visually inspected and rills and gullies identify. <br />This report provides a summary of any identified rills and gullies, all activities <br />undertaken to remediate these areas, and anticipated time frames for repair. This <br />report will be submitted annually no later than June 15 of each year. <br />SECTION 2 — IDENTIFIED RILLS AND GULLIES <br />In 2012, four areas have been identified for rilling and /or gullies. Please see Map 1 for <br />location of identified areas. <br />SECTION 3 — MITIGATION MEASURES <br />Area 1 is located on topsoil pile 16D which is on the Southwest end of the East Pit <br />highwall. A small dozer (D6) will repair the gully and the area above the gully that is <br />ponding water. The area will then be reseeded with the approved topsoil seed mix. <br />Area 2 is in the East Pit, Section 10, within reclamation block EP050. A small dozer (D6) <br />will salvage topsoil from the edges of the rill, then regrade the rilling area, and reapply <br />topsoil on the small disturbed area. The area will then be reseeded with the approved <br />seed mix for that area. <br />Area 3 is in the East Pit, Section 15, within reclamation block EP050. Mitigation efforts <br />in this area will include reestablishment of the lower reach of Prospect Ditch to the tie - <br />in point on native ground. A small dozer (D6) will most likely be utilized to reconstruct <br />the ditch; however, due to limited access in the area other means may be employed <br />dependent on amount of work needed and safety issues that may arise for operators. <br />Erosion control structures (i.e. rock and /or commercial erosion products) will be <br />employed to armor and protect the reconstructed ditch. When the repair has been <br />complete the area will be reseeded with the approved seed mix for that area. <br />Area 4 is in the West Pit, Section 4, within reclamation block WP015. A small dozer (D6) <br />will salvage topsoil from the edges of the rill, then regrade the rilling area, and reapply <br />topsoil on the small disturbed area. The area will then be reseeded with the approved <br />seed mix for that area. <br />Page 2 <br />