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Task <br /># Description Time Needed <br />months <br />1 Prepaze isolation bernn and collection ditches for North Pit. 0.5 <br />2 Strip topsoil from North Pit Area 1. Store topsoil in stockpile. 0.5 <br />3 Mine North Pit Area 1. 10 <br />4 Strip topsoil from North Pit Area 2 and mine North Pit Area 2. 10 <br />5 Prepare isolation berm and collection ditches for South Pit. Reclaim <br />North Pit Area 1 an 2 and mine South Pit Area 1. 12 <br />6 Reclaim South Pit Area 1 Slopes and mine South Pit Area 2. 13 <br />7 Mine South Pit Area 3. 14 <br />8 Mine South Pit Area 4, 11 <br />9 Reclaim South Pit Area 3 and 4 Slopes and mine South Pit Area 5. 11 <br />10 Additional Production from Staging Area 9 <br />11 Reclahn Areas 5,4,2,1 and Staging Area. 2.5 <br /> Total months 93.5 <br />The mining schedule is planned to minimize disturbance by reclaiming areas as additional mining is <br />undertaken. Note: If large contracts are awazded to the site, production could increase to the permit <br />maximum, thereby shortening the life of the pit. On the other hand, if contracts are less than <br />anticipated, the life of the pit could be extended. This table is based on a reasonable projection of <br />average production rates. <br />3. Hydrologyand Sediment Control for Mining <br />The major hydrologic design item for this operation is to safely pass runoff from the irrigated pasture <br />land uphill from the operation to the west and north. The storm runoff will be controlled by a set of <br />ditches, isolation berms and two major storm water channels. The berms will allow the pit bottom to <br />serve as a sediment pond for all storm events within the permit area. If the surrounding watershed was <br />allowed to enter the site this would not be feasible. The diversion ditches provide the necessary <br />isolation by carrying all upstream runoff away from the site. <br />There are 5 ditches used for isolation. The collection ditches will be V-ditches of 1.5 feet depth and <br />2H:1 V side slopes cut out of the natural gravel. In most areas no lining will be needed due to the mild <br />slopes of the site. Where ditches encounter steep grades, arip-rap lining will be used. Ditch # 1 <br />controls water entering into the South Pit from the west. The water from this ditch will be channeled <br />to the unnamed natural drainage to the southwest of the permit area. Ditch #2 drains the next most <br />northern area. Due to topography, the ditch will feed a pipe at its low point which will skirt above the <br />west cut slope of the well pad. This pipe will direct the runoff into the major drainage that will pass <br />Cugnini 12/03 6 <br />