Agenda - Council Work Session - 11/03/2003

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Sketch Plan Review: Rivenwick Village October 31, 2003 Page 3 of 5 -10- The proposed setback and street deviations will be discussed wi,th the Planning Commission and City Council. Open Space: The R-3 District requires each townhouse development to provide at least 40 % open space area for future resident enjoyment. Qualifying areas include grassed lawns, landscape areas, gardens, natural areas, landscape rock, mulch, wetlands, and ponding areas. City Code also states that of the 40% open space area 10% must be dedicated as an identifiable common area. The development is providing a community pool and courtyard area. Open space area requirements wilt be reviewed and verified during preliminary plat review. Access and Streets: The submitted plan shows that all townhouse units will front onto private streets. The central spine through the development is being shown as a private street. City Code requires at least one main thoroughfare through the development and such thoroughfare must be dedicated as a public street. The public street should connect to Riverdale Drive at two locations. As mentioned above, several private streets are over 200 feet in length and will require vehicle turnarounds. Staff is recommending that public streets be incorporated throughout the development. Staff and the developer should continue to discuss street design within the development. City Code permits private streets subject to the following provisions: 200-300 feet in length with turning provisions installed, over 300 feet with a cul-de-Sac and 32 feet in width, The Home Owners Association Covenants should plainly point out that private streets are not eligible for conversion to public streets at a future date. The proposed plat will accommodate 278 units, which will be serviced by Riverdale Drive. Riverdale Drive is an MSA road and will connect to 138th Avenue and also Garnet Street near the east end of the plat and Highway #10 west of the subdivision. Grading and Drainage: A grading plan is not required to be submitted for sketch plan review. General items that will be required on the grading plan include: · Soil boring locations with a report outlining soil types and depth to groundwater A drainage area map showing the acreage of each drainage sub area must be submitted. Calculations must be submitted showing the pre-development and post development runoff rates in CFS for the 10 year and 100 year storm events. A permit must be obtained from the Lower Rum River Water Management Organization. The plan must show size and type of each storm sewer pipe. · The overflow from the detention pond should be separated from the inlet to minumize short-circuiting and maximize pollutant removal efficiencies.