11-16-1998 Planning Packet - Laserfiche WebLink

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1/I Bonestroo Rosene Anderlik & I\J| Associates Enginec rs & Architects October 28. 1998 Mr. Michael P. Gaffron, Senior Planning Coordinator City of Orono Post Office Box 66 Crystal Bay. Minnesota 55323 Re: Told Development File No. 139-2416 3ones:rrc AncJfrhk ana Auccu^tet me is an Afhrmattvc Action Eiiuai Oppor:un-ty impioyer Pnnc'pafs Otto G Bo.’^cstroo, PE • Joseph C AncJerlik PE • L S‘5rv.'*l^. PE • Richjrd E Turner. PE • Gicrn R Cook. PE • Rot:crt G Schunicht. PE • Jerry A Boufu'on, PE • Robert W Rosene PE Sus<<n M Eoenm. C PA Senior ConsuU<in(s Associate Principals HovVtirj a S»in.*.jrcJ. PE • Ke«th A Gordon. PE • Robert R Pfeffe'ie. PE • R.charc: W Foster. PE • O Loskct.». PE • Pob?ri C Putsck A I A • Mark A Hanson. PE • f/icnaei T Rautrrann P£ • Ted K.Field. P.E • Kennem p Anderson P£ • Vark R. Rolfs. PE • Sidney P Wii'-amson. PE . L S • Robert F Koismiin • Agnes V R.ng • W.cnaei P Rau, PE • • Allan Rick Schmidt. PE. Offices St Paul Rochester Wiiimar and Sf Cloud VN • ^/.lwaukee. Wi W/tfbSite vvwvy bonestroo com F - .. 'Jn I Dear Mike. We have reviewed the site plan for the proposed commercial aeveloprncnt located on the east side of Shadywood Road (CSAH 19). north of Navane Lane and Shoieliiie Drive (CSAH 15) in Navarre. The site is proposed to be developed as a Walgteen ’s letail store. Them are several engineering issues that v'ili need to be addressed as part of the plan review pfoce^s. 1. Traffic: The .site plan shows two accesses onto .Shadywood Road, one of which is located close to the signalized intersection. Plans should be »ubimtled to Hennepin County lor their review and comment. The proposed signing along CSAH 19 may creat.; sight restrictions for traffic leaving the site Details should be provided for pylon signs and entrance monuments. 2. Grading: Design grades within the parking lot near the northerly access and just south of the proposed building meet or exceed 5 percent and may create problems. We would recommend that access and parking lot grades not exceed 4 percent. The proposed retaining wall is over 16 feet tall in some locations. Retaining wall design and details should be provided tci review. Fencing will likely be required above the wall along the pond for safety purposes. 3. Drainage: The existing NURP pond is not large enough to treat runoff from both the Walgreen site and the existing Culvers site as stated in a November 29.1996 letter from the Minnebalia Creek V/atershed District (MCWD). Assuming a pond normal water levei (NWL.) of 941.0. tlie proposed grading plan for the Walgreen s site shows a reriuction in the existing pond’s wet volume from 0.6 acre feet to aoout 0.3 acre feet. In order to meet MCNVD requirements it will be necessary to provide additional de.'uJ storage in the pond. Options to provide the additional storage volume might include enlarging the existing pond, installation of an underground storm water storage vault, or excavating additional pond volume in the existing wetland located just west of the ponding area. It should be noted that the existing wetland does fall under MN DNR jurisdiction and mitigation would likely be required. A method of reducing the total volume of storm water that needs to be treated nvight be to divert rooftop drainage from one or both buildings away fixjm any on-s'te treatment facilities. Technica! data indicates that the qualify of looftop drainage is cIo:>e to that of runoft from cpci: land v ;th respect to tciai suspended solids (TSS) and total phosphorous (TP) and that additional treatment not cost effective. Drainage calculations, po.nd calculations atid a draine.ge area inap shv'xdd be submitted for review. Based on the dramagn calculations, it may be necessary to expand ti;c proposed storm sev'er system to include additional catch basins. Final plans should be submitted to the MCWD .for theii review and approval. 2335 West Highway 36 • St. Paul, MN 55113 ■ 612-636-4600 ■ Fax: 612-636-1311