Agenda - Council - 04/10/2007 - Laserfiche WebLink

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Prelimin.ary Plat an.d Site Plan Review: Ebony Woods August 31,2006 Revised: September 22, 2006, December 20, 2006; April 5, 2007 Page 4 of7 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 >, 2006 has beeu prepared for tlns 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 v{ater. The Department of Natural Resources has commented that tl1e 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 shciuld 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 Trdnimum, 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 s)J.ould be provided. . A table specifying the following infonnation should be added to the grading plan: house type, garage elevation, mu:1imum floor elevation, lowest floor opening, street centerline grade. and' backyard and front yard slopes. It A permit for this development will be required from the Lower Rum River Water Management Organization. A revised. grading ana-arainage plan is required-as-P--aJ.Tufthe-final-p-Iat-submittal. 11. Traffic Generation Analysis: It is anticipated that this developn~ent 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; ThlO / Feldspar St; TH 10 / Suufish Lake Boulevard: Riverdale Dr / Feldspar St. This study showed that all of the above key intersections operated at an acceptable level of service with the exception of tl1e TI-IlO / Sunfish Lake Boulevard wInch operates at a LOS E during the pm peak hour due to the high level of through traffic on Highway 10. It is important to note that this unacceptable level of service is not associated with the traffic being generated on Riverdale Drive, but is attributable to the -125-