5.6. SR 07-21-2008 - Laserfiche WebLink

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Access There are currently two (2) accesses to the property. One access is located off 217t" Avenue in the NE corner of the property. The access from Hwy 169 to 217t" Avenue has turn lanes from the north and from the south. The other access is at the SW corner of the site and was the main entrance for .Elk River Bituminous. This access also has turn lanes from the north and the south off Hwy 169. It is anticipated that the SW access would primarily be used by spectators and the NE access would be for the participants, however, the site would be able to be exited at both locations no matter where you were on si#e. Screening We are anticipating a storage area in the SE corner of the site for snow making and grooming equipment. This area of the site is screened fairly well today by the trees on the site; however additional fencing could be added for screening and security, if needed. Utilities No utility modifications are anticipated to be needed. Storrnwater/Drai roaae The existing site contains a relatively large land-locked pond which receives run- offfrom the majority of this site in addition to portions of the TH 169 Right-of-way and westerly site. It appears that the on-site pond overflows to the west at an elevation approximately 4 feet above the proposed track elevation of 958.5; the current elevations and characteristics of the site make it difficult for water to run off the site. Infiltration basins are proposed as the primary method of water quality and a means to reduce run-off volumes to the existing land-locked pond. Based on the highly permeable gravel/sand soils within the site, it is expected that the infiltration basins will work efFciently to minimize additional discharge to this pond. A culvert outlet will be installed from the infiltration basins to the pond so that in the event of large storm events, the available detention volume within the site will be maximized. The 100 year and back-to-back 100 year storm events have been modeled and demonstrate that the site will maintain drainage within the pond areas of the site;. the adjacent properties are unaffected. Storm water runoff will be managed on site in conformance with the City of Elk River Erosion and Stormwater Management Standards, the MPCA, National Pollutant Discharge Elimination System (NPDES) II requirements and the current Watershed rules. A SWPPP (Storm Water Pollution Prevention Plan} will be developed prior to grading operations along with erosion control provisions. Temporary and permanent methods will be employed to mitigate storm water runoff -including the aforementioned infiltration basins.