Agenda - Parks and Recreation Commission - 11/15/2001

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Sketch Plan Review: Birch Hill Lodges Page 2 of 3 o o a second access point is available for emergency purposes. The site plan is proposing private streets from the townhome structures to Cobalt Street. Lots: The sketch plan is showing eight, ten and twelve unit structures that range in size from 8,900 square feet, 10,600 square feet, and 12,512 square feet, respectively. The City Code standards for the lot sizes in the R-3 district are outdated and difficult to apply to current development trends. However, the minimum amount of area required by the current standards for the types of structures proposed would be 504,000 square feet. The area of the plat is 613,387 square feet. Grading and Drainage: Drainage is collected via overland flow and storm sewer to ponds located in two areas. One ponding area is proposed for the northeast comer of the site. This pond will overflow into the wetland located on the north side of Sunwood Drive. A second and smaller ponding area is located adjacent to State Highway #47 approximately 250 feet south of the northwest comer of the site. The outlet from this pond discharges into the storm sewer system for State Highway #47 which ultimately discharges into a sedimentation pond before overflowing into DNR protected wetland 658W. It will be necessary to obtain a permit from MnDot showing that the post development flow into this storm sewer is less than or equal to the predevelopment flow. A review of the property must be made to identify any existing wetlands. A permit must be obtained from the Lower Rum River Water Management Organization which will need to address the adequacy of storm water treatment, erosion control during construction, and any impact, to wetlands. In addition to the above, special attention should.be directed to the following: · The grading plan should identify the elevation of high points between State Highway #47 and the townhouse units. Turfed areas flatter than 2% on the grading plan will need to have a certificate of grading showing that actual grades exceed 1% prior to the issuance of occupancy permits. The proposed park area is proposed to be graded flat with a four foot drop to the existing park along the western border of the site. The grading plan for the park area will need to be revised once the boundaries of the park area defined. -5-