06-15-1978 Council Minutes - Laserfiche WebLink

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_�� � � : Page �8 , , /�o,s�;�t�taa, �ode.�, �Kc�!e�ila � i�sccaci�, '�sc. G�a�s �•�•�s . ZS�S �. �_ / d1�!!�36 O!ro G.Bonrsfroo.T.E. Lawrencc F.Feldsltn.P.E. SKIfR dY RoDart W.Roaene,l.E. Gknn R. Cook, P.E. /la,�, /{�l+�nesata. 55ff3 loreph C. Anderllk. r.E. Eetth A. Gordo». P.E. � BradJord A.Lem6uj. P.E. Thornat E. Noyei.l.E• � P�p/f�: 6.�6—'�F�SOD • Robcrf D. Frlaaa�d,P.E. R(chnrd W.Fottrr, P.E. I� RicMrd£. Zurntr,l.E. Ro6ert G. Sthunlcht, P.F. . lomts C. Ofron. P.E. Marv(n L. Sorvala, P.E. ' Donald C.BWaardt.P.E. June 6, 1978 x��rti x.��..r.�- Clwrler A. Erlcbon Leo M. Pawalslry �. Walter Benson Aarlan M. OUon City Administrator � `' � �� ^. City of Orono D E5 Box 66 �S ' Crystal Bay, Mn. 55323 r ��t v .�..1 Re: Walter�s Port Sea Wall Our File No. 139 ►� v�I..L�.C�� .�'f� �Fi��:� Dear Mr. Benson: Pursuant to Council direction, we have reviewed the Walter-�s Port sea wall problem and present the following summary of our review. We have inspected the • sea wall at the Walter's Port Lagoon together with Mr. Reese, Mr. Crist and Mr. Ellis and observed the condition of the existing wall. Subsequent to that in- spection, we have had several discussions with Mr. Reese regarding the method of repair/replacement of portions of the west wall. It is our understanding that the south 125 feet of west sea wall, along the channel area, is to be replaced with aluminum sheeting like that already inplace along the east side of the channel. Mr. Reese has submitted several sketches in- dicating how the work will be accomplished. It is proposed to install a break water at the lake end of the wall, consisting of large boulders, 24" to 36" in size. Tie-backs are indicated, 5 feet on center, anchored to piling approximate- ly 15 feet behind the wall. Based on our review of the sketches and our dis- cussions with Mr. Reese, we have no engineering objections to this concept and recommend that it be accepted by the City. It will, of course, be necessary for the Walter�s Port Association to furnish detailed engineering drawings, certi- fied by a professional engineer registered in the State of Minnesota for the con- atruction and installation of the aluminum sheeting sP.a wall, which should include such details as length of sheet piling, diameter of tie-backs, soils and earth pressures on wall, etc. The installation of the tie-backs as proposed in the sketch will require some dis- ruption to the marshy area adjacent to the west wall. It is our opinion that this disruption will be minimal and that the marshy area will recover quickly to its present condition. We further understand through discussions with Mr. Reeae that the remainder of the wQst wall will be left basically in its present condition. Portions of the wall that have been raised from ice-heave will be cut down and the existing narrow walkway along the top will be removed. Most of the marshy area behind this portion of the wall is at an elevation very near to lake level. It is assumed by everyone concerned that the portion of the sea wall belaw lake level is relative- ly structurally sound, and therefore there is no pressing need for any i�ediate replacement in thia area. - Page 1.