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sediment will be allowed to leave the site and cloud any downstream waters. Seeded overburden <br /> and waste fine berms throughout the site ensures that no surface flows may exit the site. <br /> The two principal ways that the gravel pit could affect the water quality of the area downstream <br /> are a) through poor sediment control within the site causing increased sedimentation <br /> downstream, and b) by fuel leakage from a ruptured tank. Water that is encountered in the pit <br /> will not be released from the site.New excavation areas will dewater into adjacent settling ponds <br /> as needed. No water from disturbed areas leaves the site. Fuel leakage is also not a problem since <br /> all fuel tanks on-site will have secondary containment as well as strict SPCC Plan procedures for <br /> spill prevention and control. <br /> According to searches on the Division of Water Resources database,there are no wells within <br /> 600 feet of the mining pit of the Alma Placer Mine site. One well exists on-site, 289937, and is <br /> permitted to High Mountain Mining Company, L.L.C. for commercial use. <br /> 3. Groundwater <br /> Groundwater is generally found at South Platte River level in the permit area and will be <br /> encountered in the gold mining operation in the cuts shown on Map C-2. It is expected that <br /> excavation in cuts east of Highway 9 will reveal old river channel alluvium and water will be <br /> pumped into the pond system as described in the mine plan. <br /> The quality of the water in these site specific alluvial gravel is good with acceptable pH, low <br /> dissolved solids and virtually no suspended solids. The lode gold deposits and old mines <br /> upstream have not contributed significant acid water and/or heavy metals or other ions of <br /> concern downstream. <br /> 4. Water Consumption for the Operation and Water Rights <br /> The gravel operation will use water for dust suppression on roads and in plants, raw gravel <br /> crushing, screening and stockpiling, and domestic uses in the shop building and living trailers. <br /> The gravel operator will allow all wash water to enter settling basins that will overflow into <br /> Ponds #3 and#4. From these ponds, a pump will recycle clean water back to the plant. Makeup <br /> Alma Placer Mine <br /> December 2017 G-3 <br />