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<br />occurred, and is not expected to occur at any time. Given the <br />rock type, mining does not take place close enough to the sur- <br />face to create the potential for subsidence. <br />D. 2. Comment: <br />Please note that the operator must submit a technical <br />revision or an amendment prior to any possible future earth <br />moving operations which have not been included in this <br />amendment. <br />Cotter Response <br />Cutter acknowledges the requirement for a technical <br />revision or permit amendment prior to any future earthmoving <br />operations on pages D-2 and D-3 of the pending amendment <br />application. <br />D. 3. Comment: <br />Please describe in detail how radioactive sediments from <br />the settling ponds will be removed and handled prior to <br />regrading the ponds. To what extent will the radioactive <br />sediments be removed? <br />Cotter Response <br />The removal and handling of sediments resulting from <br />the operation of the water treatment plant is subject to and <br />regulated by license condition 13.3.2.3.4 in Cotter's <br />Radioactive Materials License CO-369-035: <br />Radioactive Sludges and Sediment Disposal <br />Accululations of radioactive materials in <br />clarifiers, filters, and exchange columns <br />shall be minimized. Filter press cake <br />shall normally be removed from the site <br />each operating weekday, and ion exchange <br />back wash shall be removed at least every <br />two months. Sludges shall be removed <br />from the evaporation and drying ponds <br />annually. <br />-4- <br />