HomeMy WebLinkAboutRe: grading (2) Bonestroo,Rosene,Anderlik and Associates,Inc.is an Affirmative Action/Equal Opportunity Employer
Bonestroo Principals:Otto G.Bonestroo,P.E.•Joseph C.Anderlik,P.E.•Marvin L.Sorvala,P.E.
Richard E.Turner,P.E.• Glenn R.Cook,P.E.• Robert G.Schunicht,P.E.• Jerry A.Bourdon,RE.
RoseneRobert W Rosene,PE.and Susan M.Eberlin,C.P.A.,Senior Consultants
Associate Principals:Howard A.Sanford,P.E.• Keith A.Gordon,P.E.•Robert R.Pfefferle,P.E.
Anderlik &
Richard W.Foster,P.E.•David O.Loskota,P.E.• Robert C.Russek,A.I.A.•Mark A.Hanson,P.E.
Michael T Rautmann,P.E.•Ted K.Field,PE.• Kenneth P.Anderson,P.E.•Mark R.Rolfs,P.E.
Associates Sidney P.Williamson,P.E.,L.S.• Robert F Kotsmith
Offices:St.Paul,Rochester,Willmar and St.Cloud,MN• Milwaukee,WI
Engineers &Architects
August 15, 1997
Mr. Michael P. Gaffron
Asst. Planning and Zoning Administrator RECEIVED
City of Orono
Post Office Box 66 AUG 8 1997
Crystal Bay, Minnesota 55323
Re: Dennis Meyer
File No. 139-2257
Dear Mike,
We have reviewed the grading plan for the proposed residential home construction for Dennis
Meyer on Tract F at Tonkaview Lane. The grading plan is acceptable from an engineering
standpoint. Due to the increase in hardcover and the existing severely steep slopes immediately
south of the proposed residence, we would recommend that the applicant construct a storm water
quantity pond. The pond would function as a dry pond, used only to reduce post-developed peak
flows to existing conditions. We have estimated the drainage area to the pond at 0.7 acres.
We recommend that the pond be graded approximately 25 feet in diameter, with a two foot
depth, 3 to 1 slopes (max.), and a 6-inch outlet culvert. These specifications would reduce the
developed peak flows to existing conditions. The approximate elevations of the pond would be
1022 at the bottom and 1024 at the top of the berm. The culvert would extend from the bottom
to daylight below the berm. The runoff would reach a depth of 1.5 feet in the pond during a 100-
year storm event, assuming that the outlet is not plugged or frozen. We have attached a rough
sketch of the recommended pond.
Please contact me at this office if you have any questions regarding this matter.
Yours very truly,
BONESTROO, ROSENE, ANDERLIK, & ASSOCIATES, INC.
Shawn D. Gustafson, P.E.
Cc: Mr. Greg Gappa, City of Orono
2335 West Highway 36 ■ St. Paul, MN 55113 ■ 612-636-4600 ■ Fax: 612-636-1311