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<br /> Bonestroo,Rosene,Anderlik and Associates,Inc.Is an AffirmativBort ityer
<br /> Bonestroo and Employee Owned ��III■■■
<br /> Principals:Otto G.Bonestroo,P.E.•Marvin L.Sorvala,P.E.•Glenn R.Cook,P.E.•Robert G.Schunicht,P.E.
<br /> 0 Rosene Jerry A.Bourdon,P.E.•Mark A.Hanson,P.E.
<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,P.E.• David O.Loskota,P.E.
<br /> Associates Michael T.Rautmann,P.E.• Ted K.Field,P.E.•Kenneth P.Anderson,PE.• Mark R.Rolfs,P.E.• David A.Bonestroo,M.B.A.
<br /> Sidney P Williamson,P.E.,L.S.•Agnes Iv1.Ring,M.B.A.•Allan Rick Schmidt,P.E.• Thomas W.Peterson,P.E.
<br /> En ineers&Architects James R.Maland,P.E.• Miles B.Jensen,P.E.• L.Phillip Gravel III,P.E.• Daniel J.Edgerton,P.E.• Ismael Martinez,P.E.
<br /> 9 Thomas A.Syfko,P.E.•Sheldon J.Johnson• Dale A.Grove,P.E.• Thomas A.Roushar,P.E.• Robert J.Devery,P.E.
<br /> July 29 2003 Offices:St.Paul,St.Cloud,Rochester and Willmar,MN•Milwaukee,WI•Chicago,IL
<br /> Website:www.bonestroo.com
<br /> Mike Gaffron
<br /> Planning Director 02
<br /> City of Orono (41 y ui,
<br /> Post Office Box 66 OyON
<br /> Crystal Bay,MN 55323 0
<br /> Re: 680 Tonkawa Road
<br /> Plat No. 03-2901
<br /> File No. 139-03-000
<br /> Dear Mike,
<br /> We have reviewed the revised grading plan dated 6-19-03 for the proposed new home construction at 680
<br /> Tonkawa Road. We have the following comments in regards to engineering matters.
<br /> • The sod swales north and south of the proposed home are shown at grades of 6%to 8%.We recommend
<br /> that sod swales not exceed 5%because of erosion concerns.The applicant should modify the Swale design
<br /> to minimize erosion potential.
<br /> • Retaining walls exceeding 4-feet in height require a separate engineered design submittal for review and
<br /> approval. Wall elevations were.not provided so it is unclear whether any walls heights exceed 4-feet.
<br /> • The applicant has stated that drainage calculations were submitted for the neighboring property at 684
<br /> Tonkawa approximately 1 1/2 years ago.That may be true however they are not specific to this application.
<br /> Separate drainage information should be submitted that is specific to this site. That information should
<br /> include existing and proposed drainage area maps and drainage calculations for the one, ten and one
<br /> hundred year storm events.The drainage area maps should show the total drainage areas(on and off site)
<br /> affecting all areas of the property.Flows through swales on the north and south sides of the proposed home
<br /> should be quantified. Pre new home rates should not exceed post new home rates.
<br /> • The erosion and sediment control measures should be in place,inspected and approved by the city prior to
<br /> any grading or construction activities.
<br /> Please contact me at(651)604-4863 if you have any questions regarding this matter.
<br /> Yours very truly,
<br /> BONESTROO, ROSENE,ANDERLIK& ASSOCIATES, INC.
<br /> j I
<br /> Tom Kellogg
<br /> Cc: Greg Gappa, City of Orono
<br /> 2335 West Highway 36 ■ St. Paul, MN 55113 ■ 651-636-4600 ■ Fax: 651-636-1311
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