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Since the operation will only be active for 6 months per year average, therefore, the full gold mining <br />operation will take approximately 24 years. The gravel sales will be concurrent with gold mine <br />operation. <br />Section 7.0. Sediment Control System for Operation <br />The permit area is basically divided into 4 mining areas, as well as the wash plant area and the upper <br />ponds near the Westerman Ditch. The eastern and western areas contains significant pre -law <br />disturbance. The southern area primarily drains to the water holding ponds and settling pond. Pre -law <br />areas have no new controls since the porous nature of the gravel provides good sediment control, since <br />any runoff seeps in the ground from these areas. <br />There are other numerous depressions piles and valleys which trap runoff and infiltrate it into the <br />ground. Due to extreme porous nature of the gravel the numerous depressions and the 2 main ponds <br />present in this area, there has never been a problem with disturbed area runoff leaving the site. All runoff <br />from this area is trapped in the depressions. For this reason, no new collection ditches are planned. <br />Gravel berms of 3 feet height will be placed at the downhill portion of all mining areas, if the areas are <br />not trapped by the pit excavations themselves. Any water from the south portion of the permit will flow <br />down the access road to the plant area, where this flow will be directed into the sediment pond, as shown <br />on Map C -2. No new sediment control facilities are planned for the permit area. There are major areas of <br />pre -mine hydraulic mine disturbance outside the depression area that do drain off site but they have <br />nothing to do with the current operation and are not collected by the ditches or the depression area. Also, <br />these areas consist of large cobbly material that does not cause any issues with off site sediment <br />delivery. All of the disturbance related to this mine either drains to the sediment pond or the depression <br />areas or are porous enough as to not create runoff. <br />This Settling Pond below the wash plant pond has a surface area of 1500 square feet and will reach a <br />depth of 20 -30 feet at a grade of 2.011:1.OV. The pond will be completely incised in original ground. No <br />dam will be built. There will be no discharge from the pond since the drainage areas are so porous and <br />Sullivan Aggregate Pit March 2015 D -9 <br />