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FEB-20-2901 14�31 MINNEHAHA CREEK WATERSHED 6124710682 P.05/05 � Perm,it AppIication No.: 01-023 R�il�: B,N Applicant: Minnetonka Center for the Arts R�ccived: l/29/U1 Project: New facilitv on a developed pronei-tr Comlalete: 2/1/01 ' Lacation: 2440 North Shore Drive, Orono Mailing Date: Zl12/O1 Recommendation: Approval in accordance with submitted application and plans. Permit should�ot be issu�d until the following conditions aze met: . 1. A surety of$2,500 for erosion control and$6,000 for sioniiwater mana�ement must be recei'ved. 2. A maintenance agreement for the retent�on pond and rain �ardens m��st be executed and recorded. 3. Rule J fees must be paid. Background: The proposed project is the consttuction of a new Minnetonka C�nter for the Arts Facility near North Shore Drive and Briar Street in Orono. No wetlands are lacated on the site. The site is about 6 acres in size. The project has received Planning Com�l�ission and City Council appro��al. Rules B and N apply. Ru.le B • The erosion control plan meets Rule B requirements and incluc�c� silt fence w�here neeessary,a rock construction entraaee,and h�aybale pmtection around catch hasins. A surety of$2,500 is required. Rule N This project requires B1VIps and ratc eontrol. �MPs proposed (ur the project include four rain gard.ens. Rate control is provided by a stormwater retention pan�l_ The pond iias a a 4 foot 10:1 � bench. Runoffrates at each poinc exiting the site will decreas�� li�r che 1, 10, a�id 100-year events. Overall rwioffrates from tUe site will decrease bv 72 ��rr��nt for the 1-year event and by 46 percent for the 100-year event. Excess wa.tet in the rain gard�ns will drain into the retention pond. Drainage from the retention poad will run to a drainage e�sement on the neighboring property to the nortla. The City of Oron�has confirmed that th�� have a drainage easement over the land to the north of the property. Neighbors have r�ised conc�,ns that the project could be increasing the runoffto the properties to the north and that the uu�let from tlie proposed pond would cause erosioa in the cirainage easement to the north of tl,e Property_ However,rates will not increase to any of the nei�hboring properties and a visit to tli�• site indicated that the drainaae easem�nt receivi.ng water from th�pond is naturally veaetated u,�tl should be able to withstand flow from the pond. ,y T:\0185\01\l S I�APPOI 0?3 . � 02/l5/Ot