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. � .. ' � Bonestroo,Rosene,Anderlik and AssocJates,Inc.Is an Affi�mative Action/Equal Opportunity Employer Bonestroo Principals:Ot[o G.Bonestroo,P.E.•Joseph C.Anderlik,P.E.•Marvin L.Sorvala.P.E.• � Richard E.Tumer,P.E.•Glenn R.Cook,P.E.•Robert G.Schunicht,P.E.• Jerry A.Bourdon,P.E.• . Rosene Robert W.Rosene,P.E.and Susan M.EDerlin,C.P.A.,Senior Consultan[s �'� Associate P�incipa/s:Howard A.Sanford,P.E.•Keith A.Gordon,P.E.•Robert R.Plefferie,P.E.• Anderliic & 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,P.E.•Kenneth P.Anderson,P.E.•Mark R.Rolfs.P.E.• � Associ�tes Sidney P.Williamson,P.E.,L.S.•Robert F.Kotsmith•Agnes M.Ring•Michael P.Rau,P.E.• A�lan Rick Schmidt,P.E. Engineers &Architects o��;�es:5�.Pa��,Rochester,Wil�mar and St.Cloud,MN•Milwaukee,WI June 22, 1998 wensite:www.eonestroo.com Mr. Greg Gappa Director of Public Services City of Orono PO Box 66 Crystal Bay MN 55323-0066 Re: Head Property Sanitary Sewer File No.139-GEN Dear Greg: As directed by City staff, we have reviewed the existing conditions and the possible sanitary sewer service to the Head property in Orono. The property is located on Crystal Bay, north of Minnetonka Beach and west of C.R. 15 (Shoreline Drive) neaz the Arcola bridge as shown on Figure 1. Most of the property is relatively flat, elevated just one to two feet above the NWL(929.6) of the lake. The existing residence is located near the high point of the property at an elevation approximately eleven feet above the lake's NWL. An on-site septic system provides sewer service to the property. The system is currently nonconforming and no alternate septic sites exist on the property. :t :s propos�d that sPwer improvements to the Head property include the installation of a residential gr�ne�r�tation and forcemain as shown on Figure 2. As part of the project,a 4-inch HDPE pipe would be directionally bored southerly under the lake to an existing gravity manhole at the intersection of Shoreline Drive and Beach Lane in Minnetonka Beach. The 4-inch pipe would serve as a conduit for a 2-inch forcemain that would cazry flows from the Head property to the existing manhole. The conduit would provide a mazgin of safety against forcemain leaks and allow for future forcemain maintenance without re-boring the line. Beach Lane will be excavated around the existing manhole to make the forcemain connection. The street would be restored to its original grade and section. Disturbed lawns would be regraded and restored with sod. The �roje�t will require the approval of the Minnesota Department of Natural Resources (NIN DNR). Pernuts wili be required from Hennepin County,Minnesota Pollution Control Agency and the MN DNR. Tt�;.;;;__:.:.*�a cost f�r the proposed improvements is$54,000. The installation of the grinder station and �:�r.i��r:�o.: of the s�wer to the home will be the responsibility of the property owner. A detailed cost estiri�t��fc��rr,e proposed improvements is attached for your review. � Please contact me at 604-4863 if you have any questions. Sincerely, BONESTROO,ROSENE,ANDERLIK&ASSOCIATES,INC. _�- �� i om Ke:logg 2335 West Highway 3G ■ St. t'aul, MN 55113 ■ G�2-G3G-4G00 ■ Fax: G12-G3G-13]9