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Z <br /> OUR4YSILVER NAVES <br /> Materials Handling and Spill Prevention <br /> It is anticipated that no stormwater discharges will occur for any stormwater events prior to <br /> being allowed to settle in the setting pond. A summary of estimated risks if a discharge were to <br /> occur is presented below: <br /> Mine Pond Mine Pond Mine Pond Sediment <br /> Pollutant 1 2 3 Pond 1 <br /> Oil and Grease Low Low Low Low <br /> Total Dissolved Solids Low Low Low Low <br /> Total Suspended Solids Low Low Low Low <br /> pH (Outside Range 6.5 to 9.0) Low Low Low Low <br /> The mine water is regulated as an industrial discharge under the Colorado Discharge Permit <br /> System (CDPS) and is subject to effluent limitation guidelines and water quality based effluent <br /> limitations. The Mine Water is not part of this SWMP. However, stormwater that comingles <br /> with mine water is subject to the same CDPS permit limits at Outfall 002A. <br /> As shown on the SWMP Site Map,the mill is entirely underground. As described in Attachment <br /> A of the Discharge Permit Application, a number of chemicals will be used in the milling <br /> process, primarily in flotation of the sulfide minerals. The two main mill tunnels will be graded <br /> to drain to a central underground sump, so that any chemical spill that could possibly occur <br /> would never enter the mine water discharge and consequently, the site discharge. This central <br /> sump will have a capacity of 3000 gallons, which is far more than any of the chemical tanks that <br /> will be stored in the mill area. <br /> Mill Chemicals <br /> Aero 242 Promoter-0.01 lb/ton <br /> Aerophine 3418- 0.02 lb/ton <br /> Copper Sulfate (CuSO4)-0.22 lb/ton <br /> Hydrated Lime- 5.36 lb/ton <br /> Sodium Metabisulfite [MBS]- 0.53 lb/ton <br /> MIBC [Frother]- 0.23 lb/ton <br /> SIPX-0.04 lb/ton <br /> Zinc Sulfate (ZnSO4)-0.53 lb/ton <br /> Flocculant [all thickeners]- .1 lb/ton <br /> Stormwater Management Plan 9 P a g e <br />