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/ ~,T1 • • <br />Y ~ Y <br />Mr. Jeffrey W. Todd - 2 - February 25, 1987 <br />~/ 5. How will the operator mitigate accelerated erosion that may result from <br />chemical spraying? <br />~? Please discuss your plans with regard to examining other available <br />products for surface application methods. We would be interested in learning <br />the results of your research. <br />.`7. Please discuss your general schedule for dam grading and rock <br />application. This will be handled in more detail during the upcoming <br />amendment process; however, such activities are directly related to the <br />present issue of dust control, since the dams are known to be a major source <br />of airborne dust. <br />/ 8. Your proposal mentions the use of "erosion control mats". There are a <br />large number of such erosion control products on the market and such <br />applications can be quite successful. Please discuss, in detail, your plans <br />to use geotextiles or other erosion control products at the mine site. Do you <br />plan to implement specific test areas? We recommend that some test areas <br />should be used. Include specific schedules in your discussion. <br />9. Snow fencing seems to be a good idea, and such plans should be <br />~/ implemented. Please provide specific details regarding the location and <br />construction schedules for snow fences. Will the retention of additional <br />moisture cause any stability problems? <br />/10. Please briefly discuss your plans to test magnesium chloride <br />application and include a discussion of the process by which such application <br />stabilizes the tailing surface. Are there any toxicity problems associated <br />with its use? <br />X11. Has the operator considered the use of sprinklers to maintain tailing <br />moisture? Certainly, the use of sprinklers can case excessive erosion on <br />slope areas, but this would not be a concern at flatter locations. Please <br />provide a detailed discussion of this issue. <br />We-look forward to your response and to working with you to resolve these <br />issues. Again hank you for your cooperation. <br />Sincerely, ,~" <br />/~ / :Y <br />/ ,% <br />d Berry <br />amation Specialist <br />DAB/pjh <br />7740E <br />