4.9. SR 01-03-2017 - Laserfiche WebLink

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Surface water from the pond located in the existing ERX Motor Park area is utilized for dust control and snow making for winter events. A DNR water appropriation permit is not required for these activities because the quantity of water utilized is below the permit threshold (10,000 gallons/day or 1,000,000 gallons/year). In the event Phase 2 does include restroom/shower facilities to serve the campground, presumably new wells would be necessary. The Project Proposer will coordinate with City, County and state agencies including DNR and MDH to ensure all approvals and permits are obtained. 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. Stormwater will be treated prior to being discharged to existing wetlands on the property. Wetland hydrology will be maintained to the greatest extent practicable. ERX Motor Park will maintain a 25 foot vegetated buffer around regulated wetlands when practicable, as required by the City of Elk River. Wetland Crossing Impact: Approximately 2,050 square feet of Wetland 3 (as identified in the Wetland Investigation Report) will be impacted by the construction of a crossing that is needed to access the open space area that will be utilized during events for overnight camping. Wetland hydrology will be maintained through the installation of a 12" HDPE culvert and silt fence and erosion control blanket will be installed, where appropriate, to prevent erosion and sedimentation into the adjacent wetland areas. The portion of Wetland 3 proposed to be impacted is a Type 1 seasonally flooded basin. Crossing the wetland in this location is the only feasible alternative for gaining access to the open space (camping) area. Mitigation will not be required for this impact because the total impact quantity is below the Minnesota Wetland Conservation Act (WCA) "de minimis" threshold for a wetland of this type in this location (2,500 square feet) as well as for the Federal Clean Water Act Section 404 mitigation threshold for RGP-003-MN (5,000 square feet). 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 Page 14