Agenda - Council - 02/25/2003 - Laserfiche WebLink

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Preliminary Plat: The Village of Sunfish Lake January 31,2003, Revised February 21, 2003 Page 4 of 7 It should be noted that the designed overflow elevation could be reduced to elevation 863.17 if an overflow from Sunfish Lake to Wetland 1 I4P were provided as a condition to this development. This would reduce the requirement to accommodate a single 100-year event. Similar to the northern drainage area, the backyards between Streets A and. ~3 will need to be evaluated to determine the levels of 100 year ponding'. The comments above are based on the calculations submitted by the developer. It should be noted that staff has not completed a comprehensive review of these hydraulic calculations. -218- All wetlands within the site need to be identified and delineated and dedicated on the final plat. as drainage and utility easements. Any wetland filling or mitigation will require permit action by the Lower Rum Pdver Water Management Organization. A permit from the Lower Rum River. Watershed Management Organization. and-the Minnesota Pollution Control Agency will be required for drainage, The developer is .responsible for obtaining any and alt permits required from other regulatory-agencies. The City has enacted an ordinance that requires an elevation survey at the time of footing inspection to ensure compliance with the approved grading plan. No grades shall be flatter than 1%. Grades flatter than 2% will require a certificate of grading prior to an occupancy permit being granted. Staff has noted the following items on the grading and- drainage plan should be corrected and/or addressed: · Where drainage is tntended to flow from rear of house pad to street (i.e. Lot 11, Block I), front comer lot elevations must provide for a minimum of 1% grade over turfed areas. · The high point on the north end of Street E must be identified · The.high points along Street A must be identified · The rear yard grades of Lots 1 and 2, Block 14 is flatter than 1%, which is contrary to City regulations and must be corrected. · Spec/fy emergency overflow for north pond. · Soil borings must be provided documenting the groundwater elevations. · Topographic information for a d/stance of 100 feet beyond the bo~Zders of the plat should be added to the plan. · Invert elevations and pipe sizes need to be added to the plan. · Drainage calculations need to be provided for the 10 year storm events. The development plan needs to identify the minimum floor elevations. .:?~.ii:~A table must be submitted specif-ying house type, garage elevation, minimum floor elevation, lowest opening elevation, I00 year flood elevation,, and backyard and front yard slopes 11.. Easements. The standard 10 foot drainage and utility easements (5 feet on common property lines) must be provided around the perimeter of all lots on the preliminary and final plats. All wetlands located on the property must be delineated and dedicated as drainage easements. All utilities' are to be protected with a minimum 20 foot drainage and utility easement. This. I I I