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Mine #3 <br /> The existing sediment pond shown on the mine map is in an area <br /> where fill must be obtained , therefore it must be removed . Since <br /> the flat area below the backfilled slope is in competent rock , <br /> furrows placed in this area will not threaten slope stability and <br /> they will trap moisture helpful to revegetation and at the same <br /> time lessen sediment erosion as the pond did during mine operation . <br /> No furrows will be placed on the fill slope at 2 . 0 : 1 . OV . This <br /> practice of furrowing has been successfully used in lieu of <br /> sediment ponds at other coal mines as an experimental practice . It <br /> is well suited to this site . The furrows will be approximately 1 . 0 <br /> feet to 2 . 0 feet deep . <br /> The immediate area above the two spoil outslopes will slope away <br /> from the outslope and direct all runoff into a furrow/ditch <br /> draining away from the fill as shown on the map titled - Mine #3 <br /> Reclaimed . <br /> A rock filter berm will be placed at the bottom of the North Fill <br /> as a best available technology to trap sediment from the spoil <br /> slope. <br /> Mine #4 <br /> The Mine #4 portal area consists of two distinct benches and fill <br /> slopes as shown on the enclosed map titled - Mine #4 . The Upper <br /> Bench is the largest and has the greater fill slope . <br /> A sediment pond trapping runoff from the disturbed area is located <br /> immediately west of the upper bench . A catchment basin also exists <br /> at the bottom of the spoil slope . It is proposed that furrows <br /> similar to that described above be used at Mine #4 . These furrows <br /> are shown on the map titled - Mine #4 Reclaimed . Using <br /> furrow/ditches at the top of the two spoil slopes , runoff will be <br /> directed away from the spoil slope as shown . Again , the furrows <br /> trap water helpful for revegetation while at the same time , reduce <br /> erosion and gullying . No furrows will be placed on the backfilled <br /> slope at 2 . OH : 1 . OV . <br /> A rock filter berm will be placed at the bottom of the main fill as <br /> a best available technology to trap sediment from the spoil slope . <br /> The existing small sediment pond immediately west of the Upper <br /> Bench should remain since it is stable and will be useful for the <br /> post-mining land uses of wildlife habitat and grazing . <br />