2002-03-22_REVISION - M1977436 (3)

Home Browse Search

EXHIBIT E -RECLAMATION North Lake Area The primary purpose of this amendment proposes a change to the reclamation of the existing 36-acre North Lake. According to the approved permit for this operation, the north pit area is to be reclaimed as an unlined wildlife pond. This amendment request proposes to minimize the surface area of the pond by developing a portion of the area as wetlands. In accordance with the existing permit, backfilling of the north pit slopes will utilize excess topsoiVoverburden salvaged during mining. All slopes will be no steeper than 3 V:1H to a depth often feet below the anticipated water level, transitioning to a maximum of 2V:1 H thereafter. Grading of the pit floor of the unlined North Lake area has occurred in a manner that will allow wash fines, pumped from the aggregate processing operation, to settle in and fill various cells of the excavation, which will facilitate the establishment of wetlands and minimize the exposed surface area of the pond. Wetland areas will then be seeded with wetland plant species appropriate to the various hydrologic regimes established in this manner. It is anticipated that approximately 15 acres of the North Lake area will be reclaimed as wetlands. Wetland areas will be revegetated with wetland species of herbaceous plants, lazge and small shrubs and grasses. Examples of the type of species that may be planted are as follows: Shrubs Peachleaf willow Populus sargentii Sandbar willow Salix exigua Sedges and Rushes Water sedge Carex acquatilis Nebraska sedge Carex nebraskensis Spike sedge Eleocharis palustris Torry rush Juncus torreyi Grasses Canada reedgrass Calamagrostis expansa Fowl mannagrass Glyceria striata Emergents Alkalik bulrush Scirpus paladosus Soft stem bulrush Shoeneoplectus validus Broadcast seed application rates and use of other similar species shall be determined in consultation with qualified experts. Revegetation of other disturbed surfaces in the North Lake area will be in accordance with the existing permit. A spillway to the South Platte River will be constructed at the north end of the wetlands/pond area, in accordance with Urban Drainage and Flood Control District (tJDFCD) recommendations, to allow water to flow into and out of the pit. The spillway length for the North Lake area, depicted on the revised Exhibit F-Reclamation Plan Map submitted with this amendment request, was found using UDFCD criteria. Central and South Reservoirs In addition to the change proposed for reclamation of the North Lake area, this amendment incorporates reclamation details that will allow for minimum mining setbacks from the South Platte River in the Central and Sou[h Reservoir areas. The existing approved permit provides for mining within 100-feet of