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<br />energy fuels corporation <br />Mr. Stanley V. May <br />August 28, 1979 <br />Page Three <br />/ L1 <br />J <br />2. No immediate action was necessary, because by <br />the time the excess TSS condition was discovered, runoff had <br />abated considerably, and the condition which caused the <br />excess discharge was no longer present. To prevent a re- <br />currence in the future, a sedimentation pond of greater <br />capacity has been designed and will be installed before the <br />winter months of late 1979. This pond has been designed for <br />"worst-case" surface hydrologic conditions. <br />• <br />3. Energy Fuels is currently conducting a <br />comprehensive evaluation and design study of its sedimenta- <br />tion ponds. If the study reveals that any existing ponds <br />do not comply with now-applicable OSM, EPA or Colorado <br />design criteria or will fail to meet any current effluent <br />limitations or stream standards, the pond will be redesigned <br />and reconstructed as necessary. <br />4. Detailed plans of the redesigned pond are <br />attached to this letter as Exhibit A. These designs are <br />preliminary and will be made final within about two weeks. <br />Construction of the new pond will commence in the fall of <br />1979 and completion will be before winter. <br />5. Maintenance procedures will include mowing <br />and cutting of excess vegetative growth for the purpose of <br />facilitating inspections and repairs, and will include <br />keeping ditches, culverts, spillways and other outlet <br />structures free of debris. All combustible material, other <br />than mulch or other material needed for erosion control and <br />surface stability, will be removed. All ponds, regardless <br />of size, will be examined for structural weakness, erosion <br />and other hazardous conditions, and reports and modifica- <br />tions will be made to the appropriate regulatory authority, <br />in accordance with 30 C.F.R. 577.216-3. <br />Dewatering of ponds will be achieved by a <br />non-clogging outlet device located above the maximum sedi- <br />ment storage elevation. Outlet structures have been designed <br /> <br />