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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:1 V, 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 1 /2 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 1 /2 and 32 1 /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 D - <br />