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<br />' 3.4 Effectiveness of Mitigation Measures <br />' Mitigation measures at the Deserado Mine primarily include impoundment structures to control <br />runoff from surface sites and coal refuse piles. These structures have worked well as no <br />discharges of 10-year runoff event and possibly contaminated water from these impoundments <br />have occurred. Reclamation of areas disturbed during construction and operation is effective in <br />controlling both erosion and suspended solids during runoff events. Sediment control structures <br />' such as berms, ponds and sediment fences are used to control run off from disturbed areas <br />until vegetation and the natural contours are reestablished. <br />3.5 Changes Necessary to Minimize Impacts <br />Based on the success of mitigation measures to date and the impacts so far observed, no <br />changes in mining operations or procedures are warranted. <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />20 <br />