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F~diibit 3, ScriimPnt Control Plan. The Mine No. 3 aryl middle Creek Mine Detention <br />• Basins are designed as treatment facilities, in aooordance with Bile 4.05.2. <br />These plans have been certified by a registered professional engineer. <br />Inspection during construction aryl certification after construction will be <br />performed by a registered professional ergineer. Certification of the detention <br />basins and diversion ditches will be fo*~*~~ to the Division upon conq~letion. <br />The lsoposed ing~ovrdmPnts do not fall urrler the jurisdiction of the State <br />Engineer as ~~~*+tation Control Reservoirs. Nevertheless, CYCC will e~mmine <br />the constructed ponds for structural weakness and erasion and submit reports to <br />the Division ].r1 the form of Table 42, Pond Maintenance Certification. <br />Permanent ImoarrXLnents <br />The Mine No. 3 aryl Middle Cree]c Mine Detention Basins are approved as permanent <br />irdrtients. The detention basins will serve the dual purpose of water <br />treatment facilities and stock ponds in pastures separated by fences. ZYnese <br />purposes are congaatible with the post-mining lard use of pastureland. The design <br />of the permanent ~m~~*Y~*+ts, which is set forth in EJdiibit 3, Sediment Control <br />• Plan, is in accordance with lhrle 4.05.9 and SCS Public Gha*+r~arr7 378. <br />Desicm Considerations <br />As docwmnted in Esd~ibit 3, ReAima++t Control Plan, none of the proposed ponds has <br />a capacity of more than 1,000 acre-feet, embanlanents greater than 10 feet in <br />vertical height, or surface areas greater than 20 acres. Therefore, requirements <br />of the state F}gineer for ~~~*+tation control reservoirs do not apply to the <br />ponds proposed in this application. In addition, the ponds do not meet the <br />embanlanent height and storage criteria of 30 CFR 77.216; therefore, requirements <br />of the Mine Safety and Health Administration do not apply to the pords proposed <br />in this application. The applicable design criteria are set forth in Rule <br />4.05.2, SCS Public Standard 378, and NPDES Permits oV`0027154 arri Qo-0036021. <br />All impautiLnents have been designed to contain and treat the runoff resulting <br />fr~n 10 year, 24-hour precipitation event (design event). The method described <br />in SCS Technical Release No. 55, Procedures for DerPrm;n;r,g Peak Flows in <br />Colorado, was used for <br /> <br />TR 90-06 2.05-22 Revised 11-16-90 i <br />