Agenda - Council - 11/12/2002 - Laserfiche WebLink

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-194- Prelim/nary Plat Review: Rivenwick _3rd Addition September 27, 2002, revised November 8, 2002 Page 3 of 4 · A soil boring showing the soil ,types and depth to groundwater must be submitted. · A drainage area map showing the acreage of each drainage subarea must be provided. Calculations must be submitted showing the predevelopment and post development runoff rate in c£s for the 10 year and i 00 year storm events. A permit must be obtained from the Lower Rum River Water Management Organization · The plan should be modified to show the size and type of each storm sewer pipe. · The overflow from the detention pond should outlet from its southeast comer to minimize short- circuiting and maximize pollutant removal efficiencies, · A table needs to be prov/ded specifying the house type, garage elevation, mum floor elevation, and street grade. Open Space: City Code requires a minimum of 40% of the development to consist of open space. Open space in this case, is defined as grassed lawns, landscape areas, gardens, natural areas, landscape rock, mulch, wetlands, and ponding areas. City Code reqmres 10% of the 40% open space to be identifiable common area for use by residents of the development. The development contains approximately 64% (10.31 acres) of open space. The preliminary plat is also providing a 1.2 acre area to be utilized for common open space (i.e. tot lot or recreational area for the townhouse residents). The proposed plat meets the open space.requirements established in City Code. Drainage and Utility Easements: TNs subdivision will be served by sanitary sewer and City water which will be extended from the adjacent Rivenwick subdivision. The entire plat will be served by gravity sanitary sewer, however, it should be noted that there must be a minimum of seven and one half feet of cover over the top of the sewer. Several locations on the west end of the plat have less cover than required. The road elevation should be raised to correct this situation. The watermain should be looped across T.H. 10. Sewer and water trunk fund can be utilized for the improvement outside of the plat. Utilities and Water Usage: The development will be serviced by municipal water and samtary sewer. Park Dedication: The sketch plan was reviewed by the Park Commission at their August meeting. The Park Commission is recommending park dedication be satisfied by a cash payment in the mount of $190,400 (I 12 x $1,700). The Park Commission is recommending $95,200 be allocated for improvements to Riverdale Park and the parkland along Mississippi River. It should be noted that the ram in effect at the time of final plat will be required. Trail Development and Fees: The City's current trail development fee is $400.00 per lot, or $44,800 dollars in this case. Payment ofth/s fee is required prior to recording the plat and the.rate in effect at final plat approval will be used. A trail will be required from the plats westerly boundary limits, along Riverdale Drive to Garnet Street. The trail should extend along Riverdale Park (northwest side of the park) to the east cage of Riverdale Park. Construction of the trail outside of the plat boundaries will be credited against the Trail Fees. The I ! I I I I I I I i I I I I