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Bonestroo 0 Rosene Anderlik & Associates Engineers & Architects August 25, 2000 Mr. Paul Weinberger Zoning Administrator/Planner City of Orono Post Office Box 66 Crystal Bay, Minnesota 55323 Re: Carriage Hill File No. 139-2467 Dear Paul, Bonestroo, Rosene, Anderilk and Associates, Inc. is an Affirmative ActFon/Equai Opportunity Employer and Employee Owned Principals: Otto G. Bonestroo, P.E. • Marvin L. Sorvala, P.E. • Glenn R. Cook, P.E. Robert G. Schunicht, PE. • Jerry A. Bourdon, P.E. Senior Consultants: Robert W. Rosene, P.E. • Joseph C. Anderlik, P.E. • Richard E. Turner, P.E. Susan M. Eberlin, C.P.A. Associate Principals: Howard A. Sanford, PE. • Keith A. Gordon, P.E. • Robert R. Pfefferle, P.E. Richard W. Foster, P.E. • David O. Loskota. Y.E. • Robert C. Russek, A.I.A. • Mark A. Hanson, P.E. - Michael T. Rautmannr P.E. • Ted K.Field, P.E. • Kenneth P. Anderson, P.E. • Mark R. Rolfs. P.E. David A. Bonestroo, M.B.A. • Sidney P. Williamson, P.E., L.S. • Agnes M. Ring, M.B.A, - Allan Rick Schmidt, P.E. Offices: St. Paul. St. Claud, Rochester and Willmar, MN • Milwaukee, WI %Febsite: www.bonestroo.com The City of Orono has received a request to reduce the financial guarantee for the Carriage Hill subdivision in accordance with the Development Agreement. Paul Weinberger and myself inspected the site on 8/24/00. The following is a summary of our observations: Sediments and gravel have washed down the ditches along Carriage Lane. These sediments have been deposited in the drainage way and NURP pond south of Carriage Lane. The drainage way shows signs of erosion which is also contributing to the sedimentation in the pond. The sediments accumulated in the pond have reduced the capacity of the pond. The developer should clean and restore the drainage way between the culvert under Carriage Lane and the NURP pond. At a minimum, the drainage way should be stabilized with rip rap to prevent further erosion. It may be necessary to install a pipe between Carriage Lane and the pond to minimize erosion and pond sedimentation. The NURP pond will need to be dredged to remove the sediments and restored to the elevations as shown on the approved grading plan. 2. The berm around the southwest quarter of the pond (between the outlet structure and the south end of the pond) has been raised since our last inspection. The elevation of the berm is now slightly higher than the inlet to the grate on the outlet structure. This will route storm water through the outlet structure in the 100-year event and appears to be acceptable. We recommend that the City retain the existing financial guarantee until the work outlined above has been successfully completed. Please contact me at (651) 604-4863 if you have any questions regarding this matter. Yours very truly, BONESTROO, ROSENE, ANDERLIK, & ASSOCIATES, INC. /C-217 Tom Kello g Cc: Mr. Greg Gappa, City of Orono 2335 West Highway 36 w St. Paul, MN 55113 ■ 651-636-4600 ■ Fax: 651-636-1311