08-19-1991 Planning Packet - Laserfiche WebLink

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August 9, 1991permit Annlicntion No. 91»1L4: Applicant: CityofOrono P.O. Box 66 Ciystal Bay, MN 55323 Location: City of Orono, Sec. 33AB . Purpose: Stormwater management plan for construction of a municipal ottice complex on a 14.1 acre site north of US Hwy. 12 and east of Old Crystal Bay Road. * • • . • Anniicable Rules; Rule B - Stormwater Management Plan for Individual Projects Rule D - Welland Alteration F.Yhihits Reviewed: 1. Permit Application 91-114 received August 5,1991 2. Drainage plan dated August 5,1991. 3. Hydrologic calculations dated August 5,1991. 4. Preliminary plat dated July 26, 1991. .^tnff Review Summarvt The proieci involves construction of a municipal office complex including a public works building, police station, city offices, city meeting hall and associated^>^ways and parking areas on a 14.1 acre site located north of U.S. Hwy 12 and east of Old Crystal Bay Road in the City of Orono. T ; existing site contains a 2.3 acre wetland which ^ains to the north off the propeny. The drainage path then bends to the south crossing Hwy. 12 through a 24-inch culvert into the City of Long Lake where it ^ains along a (htch f ro^gh the downtown area across Hwy. 12 and into Long Lake. This ditch has been the subject of review on several previous occasions with concern expressed about erosion problems along its banks. The wetland is generally grass and willow interspersed with some pt^kets of catt^ails. Cattails are an indication that portions of the wetland may be considered Type 3 with the remainder likely to be considered Type 2. The District regulates Type 3,4 and 5 wetlands greater than 0.5 acre in size. The existing outlet of the wetland is elevation 1017.9. The applicant proposes excavating an area including a portion of ^e w^land, which would discharge through a 15-inch culvert with an outlet elevation of 1016. The pond is designed to address District rate control and water quality treatment requirements. The connguraaon as proposed would drain the weUand 1.9 feel lower Ihim the existing outflow eievaiion Staff recommends that a configuration be designed which maintains the 1017.9 outlet elevation for the wetland. The applicant notes that construction of a public works building is to pr(xeed this fall with the other proposed buildings projected for 1992. Grading and construction plans have not been submitted for the proposed construction. Rpcommendation: Table pending receipt of: 1. Construction plans for the portions of the project proposed under this peimt. 2. Revised drainage plan providing an outlet elevation for the wetland of lOl/.y.\ \ 9 of 12 . AM ph .