Agenda - Planning Commission - 09/05/2002

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18 PrelL'~nary Plat Keview: RJvenwick 3''~ Add[don Paz¢ 2 of 4 Streets: 2'"ne submitted plan shows that all towrffxouse units will front onto private streets. The private sn'eets will outlet onto S~eer B, a public street, wtuch allows access to P, Jverdale Drive. Most of the private streets meet the CiW policy regarding lengths and turn around requirements. Further review of the private ~-xreets will. occur during site plan re'new Riverdzd- e Drive h~ been stuffed from its current anticipated alignment defined as Outlot O of the P, avenwick subdivision. R/verdaie Drive will be an MSA street and must conform to MSA design szandards. P~everse curves should have minimum 1 O0 foot tangent sections between the curves. The proposed plat will accommodate I12 units, which will be serviced by Riverdal¢ Drive connecting to both Game~ Sa'eat on the east, -and Hig. hway 10 on the wes:. The connection to Highway 10 will involve .*,.he resi~alizauon of the Highway 10/Ra_msey Boulevard intersection. Furthermore, it is preferable for Riverdale to connect with ,~j~r~way i0 at a right angle rather than the acute angle presented in the proposed subdivision. In order to accommodate such a right angle intersection,, it will be necessary, to acquire some prope,~y, from the prope,'W to the west, which is the future County. park. k is staff's andersumding that the County is in general ~-n-eement that ',.his is the best configuration for the intersection, however, legal issues need to be researched. In order to provide ,~ minimum of two access points to service these 112 units, it is recommended that the connect/on with Highway t0 be installed, even [f the 300 foot ienbw, h between Raverdale and Highway 10 is of a temporary, nature and standards. On .Su'eet A, a 50 foot tangent section needs to be provided bet-ween the reverse curve amd the 65 foot curve radius needs to be increased to 100 feet. Grading. and Draina.~e: A preliminary grading and drainage plan h-as been submitted as sheet 5 and 6 of 7. This plan generally colle:ts storm water runoff via overland flow and storm sewer and transrmt it to two stormwater ponds consn'ucted on the east end of the pla~. The plan is generally acceptable contingent upon the folloWing comments: · A soil bonng showing the soil tTpes and depth to gound water mus~ be subrrnrted. · A drainage area map showing the acreage of each drainage subarea must be provided. Calculations must be subrmzted showing the predevetopment and post development runoff rate m cfs for the 10 year and ! 00 year storm events. A permit mug 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 ove~3ow from the demention pond should outlet from its. southeast corner 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. I I i I ! ! I I ! ! I I I I I I ! !