Agenda - Council - 10/09/2007 - Laserfiche WebLink

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Preliminary Plat and Site Plan Review: Ebony Woods August 31, 2006 Revised: September 22, 2006; December 20, 2006; April 5, 2007; October 4, 2007 Page4of7 plan, revised landscaping plan, revised building elevations prepared by a design architect showing the materials and colors of the buildings. 9. Minimum Floor Area: The R -2 District requires twinhome units to be at least.912 square feet in size. 10. Building Height: City Code restrict building height to 35 feet for twinhome buildings within the R -2 district. The proposed structures are 2 stories and meet this requirement. 11. 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. 12. Grading and Drainage: A drainage and grading plan last revised on September 24, 2007 has been prepared for this development by Brad C Wilkening PE. This plan proposes that runoff from the development will be drained to two rain gardens each approximately 750 square feet, in area which are located between the twin units in the front of the properties. Precipitation events too large to be stored in the rain gardens would overflow into 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. Both of rain gardens and a water quality treatment manhole which is located at the intersection of Ebony and 137 Avenue will provide treatment to the storm water prior to discharge into the Mississippi River. The drainage plan and the volume of water retained will be reviewed by the Lower Rum River Water Management Organization Staff recommends a provision be incorporated into the design to protect the sidewalk from the overflow from the rain gardens. All grades must have a minimum slope of 1 %. Certificates of grading will be required prior to the issuance of a certificate of occupancy since the lots proposed have overland grades flatter than 2 %. A permit for this development will be required from the Lower Rum River Water Management Organization. A final grading and drainage plan needs to be submitted as part of the final plat submittal. 13. 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 / Ramsey Boulevard; Th10 / Feldspar St; TH 10 / Sunfish Lake Boulevard; Riverdale Dr /