2005-04-22_REVISION - M1977526 - Laserfiche WebLink

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EXHIBIT E -RECLAMATION PLAN OVERVIEW The existing Worthing Pit and the Expansion Area North will be reclaimed concurrently. Historic mining activities at the Worthing Pit have produced three lakes currently used for fishing, boating and water skiing. Historic mining activities on the Expansion Area North have produced one small lake, little to no remaining topsoil or ground cover, and steep slopes. Under this amendment, the proposed post-mining land uses for the Worthing Pit and Expansion Area North will include areas of mixed residential and recreational. Should the geology be suitable, a Technical Revision will be submitted for revising the post-mining land uses for the Worthing Pit to also include a water storage facility (WSF) and access roads to the WSF. There are approximately I11 acres of disturbance at the existing Worthing Pit. These acres include three pit lakes totaling approximately 57 acres, a gravel stockpile and processing area, topsoil stockpile and equipment storage yard. There are 21 acres of planned disturbance at the Expansion Area North and 29 acres of planned disturbance at Expansion Area South. The Worthing Pit and Expansion Area North will be reclaimed concurrently to be compatible with historic and surrounding conditions. Expansion Area South will be reclaimed using the same methods described for Expansion Area North. Depending on whether a WSF is constructed, two reclamation plans (Reclamation Plan A and Reclamation Plan B) are being considered. Exhibits F-1 and F-2 illustrate reclaimed topography for Reclamation Plans A and B: Reclamation Plan A (Without WSF) - The Worthing Pit will include approximately 57 acres of total lake surface. The mined out Expansion Area North will be backfilled to a minimum elevation of 4,996-feet AMSL, at least two feet above the average ground water elevation of 4,994-feet, AMSL as shown on Exhibit F-1. All pit walls will be sloped to a maximum of 3H:7 V. Overall, the site will slope gently from east to west towards the South Platte River to provide positive drainage. Reclamation Plan B (With WSF) - Afrer construction of the WSF, the WSF will be deepened, and excavated material will be used as additional backfill for Expansion Area North. The overall maximum elevation of the Expansion Area North under this plan will increase to approximately that of Brighton Road, 5,016- feet AMSL, while maintaining the gentle east to west slope and positive drainage, as shown by the post-mining reclamation contours in Exhibit F-2. For bonding purposes, reclamation will occur in several phases, as follows: Mining Expansion Area North -The 21-acre Expansion Area North is dewatered and dry mined and remaining sand and gravel is dry mined from Worthing Pit. Afrer Expansion Area North is mined out, it will be backfilled to at least two feet above the groundwater table and slopes will be graded to no steeper than 3H:1V before application of topsoil and revegetation. Backfill will he generated by excavating shale from the floor of existing Pit Lakes 1 and 2 at the Worthing Pit. Final contours are shown in Exhibit F-1, Reclamation Plan A. ]898-Frei Ill Bzhibits_(4.20.OS).doc E-1