8.2. SR 11-07-2016 - Laserfiche WebLink

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material in the deposit. Flow rates are approximately 1,200-1,500 gallons per minute (gpm) for each plant. The washplants typically use approximately 80% recycled water and 20% make up water. The volume of makeup water will be approximately 250 gpm - 300 gpm for each plant. The plants could run 7 months (mid-April through mid- November), 5 days per week, and 12 hours per day. Under full production, and assuming make-up water requirements of 300 gpm, each plant would use approximately 4,680,000 gallons per month and 32,400,000 gallons per year. It is anticipated that the make-up water will be pumped from a groundwater pond created as part of mining operations or from a production well drilled to support the washplant. iv. Surface Waters a) Wetlands - Describe any anticipated physical effects or alterations to wetland features such as draining, filling, permanent inundation, dredging and vegetative removal. Discuss direct and indirect environmental effects from physical modification of wetlands, including the anticipated effects that any proposed wetland alterations may have to the host watershed. Identify measures to avoid (e.g., available alternatives that were considered), minimize, or mitigate environmental effects to wetlands. Discuss whether any required compensatory wetland mitigation for unavoidable wetland impacts will occur in the same minor or major watershed, and identify those probable locations. There are no wetlands on-site and no anticipated direct or indirect physical effects or alterations to any wetland features. b) Other surface waters- Describe any anticipated physical effects or alterations to surface water features (lakes, streams, ponds, intermittent channels, county/judicial ditches) such as draining, filling, permanent inundation, dredging, diking, stream diversion, impoundment, aquatic plant removal and riparian alteration. Discuss direct and indirect environmental effects from physical modification of water features. Identify measures to avoid, minimize, or mitigate environmental effects to surface water features, including in-water Best Management Practices that are proposed to avoid or minimize turbidity/sedimentation while physically altering the water features. Discuss how the project will change the number or type of watercraft on any water body, including current and projected watercraft usage. There are no surface waters on-site and untreated stormwater contacting exposed soils, stockpiles or mining areas will not be discharged off-site to any adjacent surface waters. The Site's will operate under the General Non-Metallic Mineral Mining National Pollutant Discharge Elimination System (NPDES) stormwater permit and site specific Stormwater Pollution Prevention Plans. In general, active mining areas will drain internally. Perimeter controls, such as silt fence, diversion berms and sediment traps will be utilized where necessary. Direct or indirect physical effects or alterations to surface water features as a result of the Project are not anticipated. Mining will extend in to the water table. Some created water bodies will remain on site as part of final reclamation. Environmental Assessment Worksheet Page 17 Elk River Sand and Gravel Mines:Tiller Corporation and Max Steininger, Inc.