Agenda - Council - 11/14/2006 - Laserfiche WebLink

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Preliminary Plat and Site Plan Review: Ebony Woods August 31, 2006 Revised: September 22, 2006 Page 3 of 6 The proposed units appear to contain some brick, but the submitted plans lack any details so that this can be verified. No information on color was submitted. Please submit revised elevations that include this information. 9. Streets: All six units will have direct access to Ebony Street, a dedicated and improved public street. Ebony Street is not a collector street for which driveway accesses are restricted or limited. City Staff finds this access plan acceptable plan acceptable. Street and sidewalk impacts caused by the development will need to be restored by the Developer. 10. Grading and Drainage: A drainage and grading plan dated August 3, 2006 has been prepared for this development by Brad C Wilkening PE. This plan proposes that drainage from the development will be drained to Ebony Street which in turn drains to the Mississippi River. The Mississippi River Overlay District regulations state that it must be shown that the proposed development will not increase the runoff rate or decrease the natural rate of absorption of storm water. The Department of Natural Resources has commented that the additional runoff from this site should receive treatment before flowing to the Mississippi River. Staff recommends that a detention pond be considered in the center of the site which could overflow into the catch basin located on the east side of Ebony Street. An effort should-be made to locate this pond such that it would have minimal impact to the significant trees located on the site. In addition staff offers the following comments on the grading plan: • All grades must have a minimum slope of 1 %. Several areas have grades which are below this minimum. Any lots having grades flatter than 2% will require a certificate of grading prior to the issuance of a certificate of occupancy. • Contours shall be provided for a distance of 100 feet beyond the boundary of the site. • If a pond is added to the plan the location and elevation of the emergency overland flow outlet shall be identified. • Pre and post runoff calculations should be provided. • A table specifying the following information should be added to the grading plan: house type, garage elevation, minimum floor elevation, lowest floor opening, street centerline grade, and backyard and front yard slopes. • A permit for this development will be required from the Lower Rum River Water Management Organization. A revised grading and drainage plan is required as part of the final plat submittal. 11. Traffic Generation Analysis: It is anticipated that this development will add approximately 60 trips per day to the existing traffic on Ebony Street which will subsequently utilize Riverdale Drive to obtain access to the regional road system. An analysis of the adequacy of the regional road system was conducted in Spring of 2004 in conjunction with the Rivenwick Village subdivision which consisted of 195 townhouse units. This analysis surveyed the conditions at four intersections which included: TH 10 / —209 —