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application proposed the construction of a new portal facility and haul road, because the existing <br />portals at the Orchard Valley (Bowie No. 1) Mine had been rendered unuseable by an <br />underground coal mine fire. The applicant proposed to upgrade an existing public access road to <br />serve as a coal haul road to the proposed west portal bench, which will be constructed by a <br />balanced cut-and-fill method. The portal bench fill included a 130-foot maximum height terraced <br />earthen fill constructed across East Roatcap Creek. Maximum inter-terrace facial slopes did not <br />exceed a 2.Sh:l.Ov (horizontal to vertical) slope gradient. A 48-inch concrete culvert was <br />installed beneath the cross valley fill to accommodate the 100-yeaz flow of the East Roatcap <br />Creek. <br />The permit revision application included geotechnical specifications documented in the Orchard <br />Valley (Bowie No. 1) West Mine Appendix, Volume 6, prepared by Golder and Associates, <br />consultants to the operator. This appendix presents the results of geotechnical investigations, <br />stability analyses and detailed engineering designs for the west portal bench cut and fill and the <br />accompanying upgraded haul road. The stability analyses are based upon projected slope <br />configurations and material mechanical properties obtained from material sampling and <br />laboratory analyses. <br />Stability analyses were completed for both the operational and reclaimed configurations of the <br />west portal facility area. Reclamation of the West Mine began in 2000 with complete structural <br />demolition and removal at the West Mine portal bench. The three portal adits were backfilled <br />with compacted, non-combustible material. Partial structural demolition at the West Mine fan <br />area was also accomplished. Backfilling and grading of the West Mine portal bench began in <br />2000 as well. However, because of site constraints, complete backfilling and grading was only <br />possible for the upper portion of the site. When vegetation has been established on the upper <br />portion, the East Roatcap Creek culvert will be reomoved and the lower portion will be backfilled <br />and graded. BRL has applied for a partial Phase I bond release for reclamation work performed at <br />the Bowie No. 1 East Mine and the Bowie No. I West Mine. <br />XI. Revegetation -Rule 4.15 <br />Information pertaining to vegetation baseline may be found on pages 70-75, Part 2.04 of Volume <br />1, and in the Vegetation Appendix of Volume 9A. Information pertaining to the revegetation <br />plan and vegetation success criteria may be found on pages 67-76, Part 2.05 of Volume 1, and in <br />the Vegetation Appendix of Volume 9A. <br />Disturbance at the Bowie No. I Mine began in late 1975. Currently, additional disturbances aze <br />not anticipated due to the cessation of mining. Initial disturbance occurred prior to any <br />requirements for preparation of vegetation inventories; thus, portions of this mine site were not <br />surveyed. However, as new areas are proposed to be disturbed, they are first inventoried. <br />A total of four vegetation inventories have been completed to date at this mine site. The first <br />inventory was conducted in 1977 and provided a brief qualitative description of the vegetation <br />types to comply with the existing baseline requirements. With the enactment of the Colorado <br />Surface Coal Mining Reclamation Act, came more stringent baseline requirements. A second <br />inventory for the two reference areas (pinon juniper and mountain shrub land), and about five (5) <br />acres of the original waste disposal area was conducted in 1981. This study also provided <br />information to allow for the development of a revegetation plan. A third vegetation inventory <br />was conducted in 1982 since the two identified reference areas did not adequately reflect the <br />intended post-mining land use. This third inventory allowed for the development of acceptable <br />vegetation success criteria and resulted in a modification to the seed mixture. The last inventory <br />33 <br />