Agenda - Council - 01/14/2003 - Laserfiche WebLink

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Preliminary Plat Review: Rivenwick 3rd Addition September 27, 2002, revised November 8, 2002, revised January 10, 2003 Page 3 of 4 It should also be noted that Riverdale Drive has been shifted from it' current anticipated def'med as Outlot G of Rivenwick Subdivision. Riverdale Drive will be a Municipal State Aid (MSA) street and must be constructed to MSA design standards. The developer will be responsible for the full cost of this street. The development agreement accompanying the fmal plat will define the financing of the cost associated with the resignalization of Highway #10 and Ramsey Blvd. and the future cost of relocating-R/verdale Drive when it is extended further westward. The Council may wish to. provide direction to staff concerning this issue at the preliminary plat stage. Noise Mitigation: The City received a letter from MnDot noting that the City should take a look at how traffic noise generated from U.S. Highway # 10-may affect the proposed townhouse development. Staff engaged the services of SRF Consulting firm to make a recommendation to' the City on what measures, if any, need to be taken if noise levels from U.S. Highway #10 exceed 1V[PCA guidelines. SRF has concluded that no noise mitigation should be required and MI)CA is reviewing SRF's conclusion. Gradine and Drainaee: A preliminary grading and drainage plan has been submitted as sheets 5 and 6 of 7. This plan generally collects storm water runoffvia overland flow and storm sewer and transmit it to two stormwater ponds constructed on the. east end of the plat. The .plan is generally acceptable contingent upon the following comments: · A soil boring showing the soil types and depth to ground water 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 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 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 coruer to minimize short- circuiting and maximize pollutant removal efficiencies. · A table needs to be provided specifying the.house type, garage elevation, minimum 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 ease is defined as grassed lawns, landscape areas, gardens~ natural areas, landscape rock, mulch, wetlands, and ponding areas. City Code requires 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: This. 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. -157-