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Bonestroo,Rosene,Anderlik and Associates,Inc.is an Affirmative Action/Equal Opportunity Employer
<br /> Bonestroo and Employee Owned
<br /> Principals:Otto G.Bonestroo,PE. Marvin L.Sorvala,P.E.• Glenn R.Cook,PE.• Robert G.Schunicht,P.E.•
<br /> Rosene Jerry A.Bourdon,PE.
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<br /> Anderlik & Senior Consultants:Robert W.Rosene,P.E.•Joseph C.Anderlik,P.E.• Richard E.Turner,P.E.• Susan M.Eberlin,C.P.A.
<br /> Associate Principals:Keith A.Gordon,P.E.• Robert R.Pfefferle,P.E.• Richard W.Foster,PE.•David O.Loskota,P.E.•
<br /> Associates Mark A.Hanson,PE.• Michael T.Rautmann,PE.• Ted K.Field,P.E.• Kenneth P.Anderson,PE.• Mark R.Rolfs,P.E.•
<br /> David A.Bonestroo,M.B.A.• Sidney P Williamson,PE.,L.S.•Agnes M.Ring,M.B.A.•Allan Rick Schmidt,P.E.•
<br /> En ineers &Architects Thomas W.Peterson,P.E.• James R.Maland,PE.• Miles B.Jensen,P.E.• L.Phillip Gravel Ill,P.E.• Daniel J.Edgerton,RE.•
<br /> 9Ismael Martinez,PE.• Thomas A.Syfko,P.E.• Sheldon J.Johnson• Dale A.Grove,PE.• Thomas A.Roushar,P.E.•
<br /> Robert J.Devery,PE.
<br /> October 9, 2001 Offices:St.Paul,St.Cloud,Rochester and Willmar,MN•Milwaukee,WI• Chicago,IL
<br /> Website:www.bonestroo.com
<br /> Mr. Michael P. Gaffron,
<br /> Senior Planning Coordinator
<br /> City of Orono
<br /> Post Office Box 66
<br /> Crystal Bay,Minnesota 55323
<br /> Re: Orono Senior Housing
<br /> File No. 139-01-000
<br /> Plat No. 2641
<br /> Dear Mike,
<br /> We have reviewed the site plans for the proposed Orono Woods Apartments. The site is located in the
<br /> northwest quadrant of Wayzata Boulevard (T.H. 12) and North Brown Road. The site is proposed to be
<br /> developed as a senior housing complex and office building. The plans show the senior housing to be
<br /> constructed as Phase 1 and the office complex as Phase 2.It is our understanding that the use for Phase 2 may
<br /> change based on demand.This review focuses primarily on Phase 1.The following are comments with regards
<br /> to engineering matters:
<br /> 1. Traffic: The proposed layout appears to be in accordance with our traffic flow comments dated
<br /> November 14,2000.We recommend that the access onto Wayzata Boulevard be signed and striped as a
<br /> right-in right-out only intersection. MnDOT should comment on the construction or striping of a
<br /> westbound right turn lane into the site from T.H. 12.Cross walk striping and traffic control signing will
<br /> be necessary at various locations within the site. Signing and striping plans should be included with the
<br /> plan set.Streets and parking areas should be constructed to the City's commercial/industrial street section
<br /> as per City Standard Detail STR-7. All streets and parking areas shall have B618 concrete curb and
<br /> gutter.
<br /> 2. Grading:The grading plan shows street grades at both accesses ranging between 5%and 6%.This will
<br /> create problems for stopping and turning movements, particularly in the winter. We recommend a
<br /> minimum landing area of 50 feet with a maximum grade of 2%at both accesses.Some parking lot grades
<br /> are shown at 5%. We would recommend that parking lot grades not exceed 4 percent.The grades on the
<br /> access road to the office complex exceed 8%. Grades to the parking area for the office complex are
<br /> shown at 10%.We recommend these grades be reduced as much as practical for the stopping and turning
<br /> reasons noted above.The proposed retaining wall northwest of the pond is 8-feet tall at its highest point,
<br /> all retaining walls over 4-feet in height require an engineered design and details.All silt fence must be in
<br /> place prior to any grading activity.
<br /> 3. Drainage: A drainage area map and storm sewer calculations should be provided for our review. Plans
<br /> should be submitted to the Minnehaha Creek Watershed District for their review.MnDOT should review
<br /> and comment on the plans and provide verification that the existing pond is sized for the proposed
<br /> developed conditions.Inverts of flared end sections(FES)outletting to the pond should be set at the pond
<br /> normal water level(NWL) of 972.0+/-. Class III riprap should be called out and quantified at all FES.
<br /> Minimum storm sewer size shall be 12-inches.All storm sewer in the roadway or parking areas shall be
<br /> RCP.
<br /> 2335 West Highway 36 • St. Paul, MN 55113 • 651-636-4600 • Fax: 651-636-1311
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