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have a gated discharge structure that can easily be closed to retain water for a period of time, or <br /> to attenuate release to the drain ditch, if necessary. <br /> As is seen on Map C-2,the berm will extend along the entire north edge of the pit and will also <br /> be built on the entire western edge of the pit excavation area. In these two areas,the pit <br /> excavation will be vertical from the surface down to the bottom of the gravel,which, as <br /> described earlier, is a depth of 20 to 30 feet. The slope stability evaluation of this slope is <br /> described in detail in Exhibit U. In the eastern and southern portions of the pit,the mining will <br /> occur at 1H:IV,with a minimum horizontal buffer of 25 feet to the nearest structure on the <br /> surface,which will provide adequate safety factor in case of failure of the pit wall. This is also <br /> described in Exhibit U. <br /> As mining continues beyond the initial 10.8 acres,newly excavated overburden will be placed as <br /> backfill on the pit slopes to a slope of 3H:1V or milder. Some overburden may also be used to <br /> cover the bottom of the mined out pit area and some could be sold as structural fill or could be <br /> placed in the stockpile area. <br /> Farming of proposed Pit 2 and 3 areas will continue during the mining of Pit 1,with minor <br /> modifications required to the headwater delivery system due to the location of the berm. Gated <br /> pipe will be relocated to the south side of the D %Road berm to deliver water to the Pit 2 <br /> farming area. Areas outside(upstream) of the berm will no longer be farmed but will be planted <br /> and established with a dry land seed mix to provide a buffer area of vegetative cover for the <br /> adjacent properties. <br /> PIT 2: <br /> Upon completion of mining in Pit 1,topsoil from Pit 2 will be used to complete the visual barrier <br /> along D I/z and 32 %2 Roads. Remaining topsoil and overburden will be used for backfilling and <br /> reclamation of Pit 1. Only a portion of the overburden excavated is needed to construct sloped <br /> surfaces of 3H:1 V(horizontal to vertical slope ratio)to reclaim the slopes along the outer edges <br /> of Pit 1. Excess overburden and topsoil may be held for retail sales, and some may be used to <br /> expand or lessen the slopes or create minor peninsulas in the lake perimeter for potential housing <br /> Otter Creek Pit December 12 D4 <br />