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Each catchment will be at least 800 square feet in area, thereby having a <br />capacity of greater than 14,000 gallons. <br />Appendix C contains the calculations to estimate the flow of a 100 yeaz event <br />for the two subbasins, which aze the same subbasins as in Appendix A.. <br />Appendix D shows the calculations to estimate the necessary size of riprap for <br />protecting the diversion berms. <br />7. Cotter Corporation does not propose mining any material, either ore or <br />waste rock, which is not already covered by the existing Permit No. M-1978- <br />116. The materials to be placed on the waste dump area of this amendment <br />application will not be any more toxic-forming than those materials already <br />allowed by the existing permit. The purpose of the amendment application is <br />to access the ore body by a shorter route (via the Wright Mine from the south) <br />than from the already permitted SM-18 Mine portal and waste dump site. <br />This will result in a large overall reduction in the amount of waste rock placed <br />on the surface. <br />Cotter Corporation will make the commitment to do the required sampling <br />and analyses after mining resumes (after fresh waste rock and ore is broken), <br />during the initial deposition at the surface. If the test results definitively <br />indicate that detrimental amounts of toxic materials are likely to be <br />transported away from the waste rock/ore stockpile area, Cotter will submit a <br />plan of mitigating actions. <br />12. Cotter has already forwazded to DMG a copy of the Revised Mining Plan <br />submitted to the US Department of Energy. Along with the Plan is the <br />Approval Letter of DOE approving Cotter's plan to use the ventilation hole <br />site. DOE is the federal agency that manages this tract of land. <br />If you need other information or have any questions concerning this, please contact Dick <br />White at Cotter's Nucla, Colorado office at 970-864-7347. <br />Sincerely, <br />Cotter Corporation <br /> <br />Dick White <br />Project Geologist <br />Enclosures <br />