2010-05-07_GENERAL DOCUMENTS - C2009087

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VIII. Backfilling and Grading Details of the backfilling and grading plan, the schedule, and post mine topography are located in Section 2.05.4(2)(c) of the permit application. The plan is designed to ensure disturbed areas are returned to approximate original contour in a timely manner. The plan provides for re-establishment of a stable postmining drainage system. The Division finds the plan adequate and proposes to approve the plan. SCCC has requested additional time for backfilling and grading All areas affected on the Seneca II Mine that are proposed for transfer to the PSCM, except those specifically exempted by the Division, were returned to approximate original contour. This includes the drainage channels which were returned to approximate original locations to help maintain appropriate downstream water rights. The spoil was cast by the dragline into the adjacent open pit and compacted by the reclamation equipment. All spoils were graded, highwalls reduced and spoil piles and depressions eliminated except those depressions that existed prior to mining. Cut and fill terraces were not proposed at the Seneca II Mine. The following findings have previously been made for the Seneca II lands that are proposed for transfer to PSCM at the mine: 1. The applicant requested additional time for backfilling and grading following coal removal in an area strip mine. A detailed written analysis under 2.05.4(2)(c) demonstrated that additional time was necessary based on coal production rates. Therefore, the Division approved the additional time for the Wolf Creek and Wadge pit areas, and the non-coal waste disposal site. The Wolf Creek and Wadge pit areas were reclaimed within 180 days of initial disturbance, but were regraded within 4 spoil ridges of the active pit. This delay was necessary because of production rates and pit sequencing. In some cases, it took four spoil rows to create sufficient spoil area to allow final grading to "daylight" and blend into the surrounding; topography. All highwalls have been regraded at the Seneca II Mine site. The Division approved backfilling, grading and final reclamation of Auger Area E to be completed in 1998. The solid waste disposal site, a previously mined Wadge area pit, was still being utilized for mining operations at that time. Reclamation of the area has been completed. (4.14. 1) 2. The Division approved the retention of box cut spoil or initial cut spoil outside the pit area since the applicant demonstrated that such material was not required to achieve approximate original contour in accordance with 4.09.1. Excess spoil was generated in the Wolf Creek Area, and was placed in a fill adjacent to the initial box cut. Information concerning the fill is located in Tab 12 of the permit application. Small depressions in the backfill will be used to minimize erosion, create or enhance wildlife habitat, conserve soil moisture, and promote revegetation. Seneca Coal Company has included in the postmine grading operation the use of very small swales Peabody Sage Creek Mine 28 May 7, 2010