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• - Bal_Tc:>IV a M r-= N K Consulting Engineers & Surveyors It 2638 Shadow lane, Suite 200 • Chaska, MN 55318-1172 Phone (952) 448-8838 • Fax (952) 448-8805 www.bofon-menk.com July 21, 2016 City of Orono Attn: Jeremy Barnhart 2750 Kelley Parkway Orono, MN 55356 RE: Preliminary Plat Application 16-3847 Shadywood Villas Engineering Review #1 Dear Jeremy: I Nva As requested, we have completed an engineering review of the documents submitted for the above referenced project. We offer the following observations, comments, and recommendations for your consideration: 1.0 GENERAL: i 2or 1.1 The complete Stormwater Management Plan should be submitted for review to verify adequate sizing of proposed facilities. Proposed peak runoff rates must be restricted to existing rates. Due to flooding issues immediately downstream along Kelly Avenue, maximizing the proposed system's ability to retain runoff on-site and reduce peak runoff rates would provide additional benefit to the City. 1.2 Storm sewer calculations should be submitted for review to verify adequate sizing. 1.3 Due to the size of proposed disturbance, a Topsoil Management Plan should be included with the Final Plans to ensure adequate topsoil placement. The plan should provide direction for topsoil stripping, stockpile location(s), soil de -compaction prior to re -spread, certification of topsoil for re - spread meeting specifications, and placement of topsoil. This information could be included on the Final Grading Plan. 1.4 Work within public right-of-way must be coordinated with the Public Works Department. Contractor must provide a minimum 48 hour notice prior to any work being performed. Notes should be adjusted accordingly. 1.5 The applicant will be required to obtain Minnehaha Creek Watershed District (MCWD) approval and permitting for their Erosion Control, Stormwater Management, Wetland Protection, and Waterbody Crossings and Structures Rules. A copy of any approvals or permits required should be submitted prior to Final Plat approval. 1.6 The applicant will be required to obtain Hennepin County approval and permitting for an access and work in right-of-way on C.R. 19 (Shadywood Road). A copy of any approvals or permits required should be submitted prior to Final Plat approval. 1.7 The applicant will be required to obtain a Sanitary Sewer Extension permit from the Minnesota Pollution Control Agency and a Water Main Extension permit from the Minnesota Department of Health. Applications should be coordinated with the City, and a copy of any approvals or permits required should be submitted prior to any land disturbing activity. 1.8 The applicant will be required to obtain a General Construction Permit (NPDES) to discharge stormwater associated with construction activity since more than 1 acre will be disturbed. A copy of the permit should be submitted prior to any land disturbing activity.