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EARTHMOVING: TOPSOIL SALVAGE-In this western portion of the permit, there is little soil to be salvaged. In the sand areas (Phases 3W and 4W), soil is essentially non-ezistent and what is present is little better than the processing waste or underlyi8~gand. In Phase 2W, some soil is present on top of the overburden that covers the gravel layer. This soil is not of good quality, is generally full of weed seed, and has a long history of disturbance. Nevertheless, where soil is present on top of a gravel mining area, it is salvaged and stockpiled to the side of the future pit. At},er mining is completed the soil is pushed over the top of the balled pit. For more details on this process please refer to Exhibit E, Reclamation Plan. OVERBURDEN REMOVAL - Where sand is being mined, there is essentially no overburden. In most areas the sand ertends right to the surface. The sand near the top of the deposit tends to be finer in tezture than the sand deeper in the deposit. Processing of this upper sand usually produces considerable waste, but about 9096 of this material is still useful as a product if mined with deeper sands. Sometimes, customers want a finer sand product and mining is not necessary. Therefore, where sand is present, there is essentially no overburden to be removed. Where the gravels exist in Phase 2W, overburden is usually present. Sometimes, this overburden is a fine sand material that can be processed, but usually it is simply set aside along with the soil and subsequently used to ball the excavation after the washing fines have filled the pit to the ezpected level. WATER HANDLING: • During most of the operation, water diversion and impoundments are not necessary on the west side of Academy Boulevard. All sediment basins are contained in closed basins that are surrounded by closed basins, ezcept in Phase 2W. Ls Phase 2W the sediment basins are contained in deep mining pits and the pits are not balled further than about 5 feet from the rim of the pits. Therefore, protection through the use of additional catchment basins is not needed in that area ae overflow is extremely unlikely. Diversions are also unnecessary because no streams flow through the site. Any runoff is contained within the operational basins, except on the south end of that area west of Academy Boulevard. In that area the land is quite level and any outflow goes into defined drainage systems surrounding the operation. Once the processing plant is moved to the east side of Academy, the pit fully bacldilled, and reclamation well underway, there will be a need for water control systems. At the end of this exhibit are a series of maps and figures copied from "Little Johnson/Security Creek Drainage Basin Planning Study" prepared by Simons, Li & Associates, Inc. for the EI Paso County Department of Public Works. This study defined future detention basins and other structures on this site and within several miles of this site. This study took into account the possible drainage problems that will occur with future development of this whole region of El Paso County. • West of Academy Mining Plan Page D-5