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Bonestroo,Rosene,Anderlik and Associates,Inc.is an Affirmative Action/Equal Opportunity Employer
<br /> Bonestroo Principals:Otto G.Bonestroo,P.E.•Joseph C.Anderlik,P.E.•Marvin L.Sorvala,P.E.
<br /> Richard E.Turner,P.E.• Glenn R.Cook,P.E.• Robert G.Schunicht,P.E.• Jerry A.Bourdon,RE.
<br /> RoseneRobert W Rosene,PE.and Susan M.Eberlin,C.P.A.,Senior Consultants
<br /> Associate Principals:Howard A.Sanford,P.E.• Keith A.Gordon,P.E.•Robert R.Pfefferle,P.E.
<br /> Anderlik &
<br /> Richard W.Foster,P.E.•David O.Loskota,P.E.• Robert C.Russek,A.I.A.•Mark A.Hanson,P.E.
<br /> Michael T Rautmann,P.E.•Ted K.Field,PE.• Kenneth P.Anderson,P.E.•Mark R.Rolfs,P.E.
<br /> Associates Sidney P.Williamson,P.E.,L.S.• Robert F Kotsmith
<br /> Offices:St.Paul,Rochester,Willmar and St.Cloud,MN• Milwaukee,WI
<br /> Engineers &Architects
<br /> August 15, 1997
<br /> Mr. Michael P. Gaffron
<br /> Asst. Planning and Zoning Administrator RECEIVED
<br /> City of Orono
<br /> Post Office Box 66 AUG 8 1997
<br /> Crystal Bay, Minnesota 55323
<br /> Re: Dennis Meyer
<br /> File No. 139-2257
<br /> Dear Mike,
<br /> We have reviewed the grading plan for the proposed residential home construction for Dennis
<br /> Meyer on Tract F at Tonkaview Lane. The grading plan is acceptable from an engineering
<br /> standpoint. Due to the increase in hardcover and the existing severely steep slopes immediately
<br /> south of the proposed residence, we would recommend that the applicant construct a storm water
<br /> quantity pond. The pond would function as a dry pond, used only to reduce post-developed peak
<br /> flows to existing conditions. We have estimated the drainage area to the pond at 0.7 acres.
<br /> We recommend that the pond be graded approximately 25 feet in diameter, with a two foot
<br /> depth, 3 to 1 slopes (max.), and a 6-inch outlet culvert. These specifications would reduce the
<br /> developed peak flows to existing conditions. The approximate elevations of the pond would be
<br /> 1022 at the bottom and 1024 at the top of the berm. The culvert would extend from the bottom
<br /> to daylight below the berm. The runoff would reach a depth of 1.5 feet in the pond during a 100-
<br /> year storm event, assuming that the outlet is not plugged or frozen. We have attached a rough
<br /> sketch of the recommended pond.
<br /> Please contact me at this office if you have any questions regarding this matter.
<br /> Yours very truly,
<br /> BONESTROO, ROSENE, ANDERLIK, & ASSOCIATES, INC.
<br /> Shawn D. Gustafson, P.E.
<br /> Cc: Mr. Greg Gappa, City of Orono
<br /> 2335 West Highway 36 ■ St. Paul, MN 55113 ■ 612-636-4600 ■ Fax: 612-636-1311
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