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flocculation of fine particles in the sluice tails pond takes place. This chemical is used in very <br /> small quantities and the majority of solids should and do settle very rapidly. <br /> One, at least, 55 gallon drum of Hyperfloc will be stored on-site at any one time. The Hyperfloc <br /> will be stored in the drum within 50 feet of the sluice so that it can be mixed and applied to the <br /> sluice tails within a short distance. Additional tanks of Hyperfloc will be stored in secondary <br /> containment on-site to be readily available for use when necessary. <br /> The 55 gallon steel drum, the 100 gallon mixing tank, and 150 gallon water tank will collectively <br /> be stored within secondary containment capable of holding 110%of the collective tank capacity. <br /> A standard 55 gallon drum spill kit is placed on-site to be rapidly employed if a spill of <br /> flocculant were to occur. All employees will be trained to check for spills of flocculant and <br /> trained in the use of the spill kit. In addition, DRMS, CDPHE, and Park County Department of <br /> Health will be immediately notified if any flocculant spill occurs. <br /> Flocculant will allow all solids to settle out in the initial area of the sluice tails pond. This pond is <br /> excavated in native material—glacial debris and alluvium, and will not drain to the surrounding <br /> area. As the pond is used, silt and fines will build up along the base of the pond, further reducing <br /> its permeability. <br /> 5.2 Water Transmission <br /> A sluice pond is not lined with a synthetic liner.The pond is excavated in native material that has a <br /> significant proportion of fines within it. Sluicing operations directed into the pond will decrease the <br /> permeability of the pond even further as silt and fines build up along the pond's base. Water will <br /> leave the pond in two ways: recycling to the sluice itself, and evaporation. Infiltration will be <br /> negligible. Any overflow from the sluice ponds will be contained on-site by existing site berms. <br /> 6. Schedule of Operations <br /> Mining and processing will occur approximately 8 months of the year, generally from April <br /> through November. Winter months provide freezing conditions that make year-round operations <br /> difficult. Mining will occur within the Lake County regulation limit of 6:00 AM to 7:00 PM, <br /> Monday through Saturday. The Operator will not have night mining operations, although minor <br /> truck activity or repairs may occur after hours. <br /> Box Creek Placer Mine t:rcQ Lewicki and Associatca PLLc <br /> September 2018 D-12 <br />