01-22-2002 Planning Packet - Laserfiche WebLink

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^ J Bonestroo Rosene mn ■ Anderlik & \ Associates Engineers & Architects January 3, 2002 Paul Weinberger Zoning Administralor/Planner City of Orono Post Office Box 66 Cry stal Bay. MN 55323 He: Orono Town Office File No. 139-01-000 Dear Paul; cBoncitfoo. Poicnc. Af^dcrlik and Asto<iJtei. Inc it an Affirmaiive Action, Equal Oppoffunity Employer and Employee Owned Pfincipali Otto G Bcneit.oo P£ • Marvm l Sorva'a PE • G'rnn P Cook PE • Robert G Scnun.cht Pf • Jerry A Bou'dof' PE Senior Consultants Robert W Rosene Pf • Joseph C Anderlik PE • Richard f Turner PE • SuS.»rs V! Eber'.n c PA Associate Principals-Keith A Gordon PE • Robert R Pfefferie PE • R.chard X Foster PC .D.i..dO Ictk .v* PE • Pt ,i»ir A H p£ • ViChael T Rautrrann. PE • Ted K F*eld PE • Kenneth P Ande'son. P£ • V.»rk R Ro'ts P£ • Dav J A B ;«'eviroo MBA • S.drey P X liamson PE L S • Agnei M R nq VBA • Aaan Rifk Sf^m.dt PE • Thomas M Petersen P£ • James R Maiand PC • Vi«es B Jensen Pf • i Ph.ii-o Grawr*' i:i P[ • Damn j Ed j**f*or' Pf • Isrraei V.u! r>e/ PI • Tnomas A Syf«o PE • Sheidcn j Jornson • Dar.? A Gro^e P£ • Thomas A Rou:h,«r p£ • Robert J De;<ery Pf Offices. St Paul St Cloud Rochester anj X'i!irrar VN • Milwaukee Xi • Ch.c *gr^ H Ui^btiler war wbohestroo com . A, c. We have reviewed the sketch plan for the Orono Town Office complex located at 2525 Shadywood Road. Wc have the following comments with regards to engineering matters; • The proposed ponding design provides for a maximum pond depth of 2.85 feet. At a minimum the pond should be designed to provide an average depth of 4-fcct and a maximum depili ol 8-feet. The pond design should provide an outlet structure for rate control and I -foot of skimminit to the lOO-ve i. evem. • It is assumed that the proposed pond will discharge to the existing wetland south and west of the pond. The invert of the discharge pipe at the wetland should be set at the wetland normal water level (NWL) of 929.8. riie proposed NWL of the pond is .shown at 928.0. It is unclear how this system will work given the pond NWL is lower than the wetland. • The site lies primarily within the Lafayette B;iy drainage area as identified in the City’s draft Surface Water Management Pl;in (SWMP). The SWMP also identifies the need for a regional water quality pond located somewhere ne;u- this site. This may be an opportunity to address some existing regional drainage concerns. W e would encourage the developer to consider incorporating a regional pond into their site plan. • The storm water calculations provided assume treating only mnoff created by this develo()ment. A regional pond would be required to treat the entire area draining to the pond. • Lot 3 appears to be land locked. Access easements to Lot 3 w ill need to be prov ided across Lots I and If you have any questions please call me at (651) 604-4863. Yours very truly, BONF-STROO. ROSENI-. ANDERLIK & ASSOCIATE.S. INC. /on Tom Kellogg Cc; Greg Gappa. City of Orono 2335 West Highway 36 • St. Paul, MN 55113 • 65I-636-4600 • Fax; 651-636 1311