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<br />1 <br /> <br />1 <br /> <br />1 <br />3.4 Effectiveness of Mltlgatlon Measures <br />Mitigation measures at the Deserado Mine primarily include impoundment structures to control runoff <br />from surface sites and coal refuse piles. These structures have worked well as no discharges of <br />runoff and possibly contaminated water from these impoundments have occurred. Reclamation of <br />areas disturbed during construction and operation is effective in controlling both erosion and <br />suspended solids during runoff events. Sediment control structures such as berms, ponds and <br />sediment fences are used to control run off from disturbed areas until vegetation and the natural <br />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 changes <br />in mining operations or procedures are warranted. <br /> <br /> <br />1 <br /> <br />1 <br />1 <br /> <br /> <br /> <br />1 <br />20 <br /> <br />