10-10-1988 - Agenda Packet City Council - regular meeting

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Permit Application No. 88-103 July 15, 1988 Owner: Washington Scientific Ind. 2605 W. Wayzata Blvd. Long Lake, MN 55356 Location: City of Orono, Sec. 33AD Project: Stormwater management plan for a building addition to an existing commercial site. Applicable Rules: Rule B: Stormwater Management Plan for Individual Projects Exhibits Reviewed: 1. Permit Application 88-103 received July 5, 1988. 2. Site survey prepared by Advance Surveying and Engineering Co. dated May 26, 1988. 3. Site plan prepared by Vogt Corporation dated May 19, 1988. 4. Minnehaha Creek Watershed District Permit File 87-153. Staff Review Summarj: The project involves an addition to an existing commercial building located in Orono. The building addition will add approximately 33,000 square feet of roof surface to the site which presently contains 6.5 acres of building and bituminous parking area. The addition of the building will increase the runoff rates by approximately four percent. The total site area is 25 acres. The runoff generated from the roof of the building addition will be of generally better water quality, therefore staff recommends that water gt!;lity treatment not 5e required for this site. however, runoff rates for a 100-year storm event will increase which does not meet District standards for rate control. Runoff from this site enters subwatershed designated LLLC-14 in the District's 509 plan. This is the same watershed which was reviewed extensively by the Board and the City of Long Lake several years -go. Recommendation: Table pending receipt uf: 1. 1(ydrologic analysis for a 100-year .,corm event including pre- and post - development. 2. Revised plan and calculations demonstrating conformance with District standards for rate control. Project Review Status by Other Governmental Units: The City of Orono Planning Commission granted preliminary approval for this project in June 1988.