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Topsoil was removed in advance of mining operations by scraper equipment, and was then <br />stockpiled or redistributed when possible. Stockpiles were temporarily stabilized with the <br />establishment of vegetation. <br />Overburden was blasted and removed with a dragline, then spoiled into the previous pit. The <br />initial box cut spoil was temporarily placed on an adjacent unmined area, and the spoil <br />subsequently double handled for placement back in the pit once the next pit was opened. <br />Coal was ripped or shot, removed by loader, and transported via Road A to the Hayden Station <br />power plant or to the Hayden Gulch Loadout facility (C-1992-081). <br />No crushing, screening, or washing of coal occurred, and the operation did not produce coal <br />mine waste. Non -coal waste was disposed of offsite at an approved dumpsite. <br />Spoiled overburden was graded by bulldozers to approximate original contour. Several <br />drainages were reconstructed in the mined areas, as depicted on Exhibit 20-2 of the permit <br />application package. Topsoil was redistributed by scrapers to an average thickness of 1.8 feet. <br />The approved reclamation seed mix was then drill seeded in the fall of each year, unless topsoil <br />redistribution was completed in the spring. In that case, a cover crop was sown, followed by the <br />permanent mix the following fall. Concentrated islands of seeded and transplanted shrubs were <br />established on approximately five percent of the reclaimed area. <br />At the end of mining, all surface facilities were removed, the areas regraded, topsoil <br />redistributed, and revegetation accomplished as described above. <br />Impacts to surface water and ground water have been and will continue to be mitigated and <br />monitored. Surface runoff from all disturbed areas is channeled to one of several sedimentation <br />ponds. Ponds 10, 11, Ila, 12, 12a, 13, and 14 have been constructed to date. <br />Surface water is monitored upstream and downstream of the site on Grassy Creek, Annand <br />Draw, and Sage Creek. Ground water is monitored in the Trout Creek aquifer, in spoils aquifers, <br />natural springs, and in the alluvium of Sage Creek, Grassy Creek, Annand Draw tributary, and <br />Grassy Creek tributaries. <br />Water usage at the mine consisted of dust control on roads and in pit areas. Water used in dust <br />control was obtained from Pond 002 at the Seneca II Mine. Seneca Coal Company has obtained <br />rights for all water usage at the operation. <br />PermittingHistory <br />Minor Revisions, Technical Revisions, Permit Revisions, and Bond Release approvals which <br />have been made to the Yoast Mine permit since the last renewal (RN03) are listed below. <br />Minor Revisions: <br />Revision No. Approval date Nature of revision <br />11 <br />