2013-09-13_REVISION - C1981044 - Laserfiche WebLink

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On completion of facilities and structures removal, the portal en�ries will be seaicd according else approved MSHA plan. ETU EC plans to use concrete from the dismantled coal silo and /or cindeibloclks from the dismantled fuel island and compressor building to construct a seal for the mine entries. No toxic or combustible material will be used as sealing or backfill material to minimize any potential for contamination of ground water. The portal faceup area will be backfilled with the material from surrounding areas and backfilled areas will be left in a roughened condition to minimize the potential for slippage. The postmining topography of the area is shown on the Reclamation Plan Map (Map 29). Prior to the backfilling and final grading operations, the plant growth media, ie: the top 6 inches of vegetated overburden, will be salvaged and temporarily stockpiled adjacent to the site. The stockpiled plant - growth media will be protected from erosion by a temporary vegetative cover, if final grading will be delayed, and no vehicular traffic will be allowed on signed stockpile areas, to minimize degradation due to compaction. On completion of backfilling operations, stockpiled plant - growth media will be redistributed over the area. Contour ditches or furrows will be constructed on the reclaimed slope to reduce erosion. These ditches or furrows will be approximately 20 to 50 feet apart and have check dams placed at periodic intervals. The ditches will be maintained until the vegetation becomes established. The area will then be seeded with the rangeland/wildlife habitat seed mixture. The seed mixture will be drill- seeded, using a rangeland drill, at a rate of 17.25 pounds PLS /acre. If it is necessary to apply the seed by the broadcast method, the seeding rate will be doubled. A straw mulch, applied at the rate of two tons /acre, will be applied over the seeded site, and either crimped in or applied with a tackifier. Overland Conveyor All of the overland conveyor systems and facilities will be dismantled /demolished including supports and footings. All material capable of being salvaged will be salvaged. The unsalvageable material may be placed at the toe of the faceup highwall at the portal area prior to backfilling and /or placed in the 5A underground workings near the portal entries. The affected areas will be backfilled and graded using spoil material from prior strip Mining operation. and spoil from the conveyor bench. The postmining topography of the area is shown on the Reclamation Plan Map (Map 29). On completion of the backfilling /upgrading operations., plant- growth media salvaged prior to initiation of grading operations and temporarily placed adjacent to the area to be regraded. will be redistributed over the area. The backfilling/grading operations will leave the area in a roughed condition to minimize slippage of the top dressing. Contour ditches or furrows will be constructed on the reclaimed slopes to reduce erosion. The ditches or furrows will be approximately 20 to 50 feet apart and have check darns placed at periodic intervals. The ditches will be maintained until the vegetation becomes established. It is anticipated that the ditches will fill with sediment in one or two years following vegetation reestablishment. The disturbed areas will then be drill- seeded with the appropriate land -use seed mixture, rangeland /wildlife or pastureland, for which the area is to be reclaimed. The seed will be applied with a rangeland drill at the rate of 17.25 pounds PLS /acre for the rangeland /wildlife mixture and 17.0 pounds PLS acre for the pastureland mixture. If it is necessary to apply the seed by the bi•nadcast method, the seeding rate will be doubled. Straw mulch, applied at a rate of two (2) tons /acre. vvill be spread over the seeded sites. The mulch will be crimped into the top dressing or a tackif ee_° applied tc, assure its stability.