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.w --1\11 <br />Bonestroo <br />Rosene <br />Anderlik & <br />Associates <br />Engineers & Architects <br />June 21, 1993 <br />Ms. Jeanne A. Mabusth, <br />Otto G. Bonestroo. P.E . <br />Robert W. Rosene. P.E.* <br />Joseph C. Anderlik. P.E. <br />MaNin L. SoNala, P.E. <br />Richard E. Turner. P.E. <br />Glenn R. Cook, P.E. <br />Thomas E. Noyes. P.E . <br />Robert G. Schunicht. P.E. <br />Susan M. Eberlin , C.P.A . <br />*Senior Consultant <br />Building and Zoning Administrator <br />City of Orono <br />Post Office Box 66 <br />Crystal Bay, M"innesota 55323 <br />Re: Robert Owens Shoreline Repair <br />File No. 139-1838 <br />Dear Jeanne, <br />Howard A. Sanford, P.E . <br />Keith A . Gordon, P.E. <br />Robert R. Pfefferle, P.E. <br />Richa rd W. Foster. P.E . <br />David 0. Loskota, P.E . <br />Robert C. Russek. A.I.A. <br />Jerry A. Bourdon. P.E . <br />Mark A. Hanson, P.E. <br />Michael T. Rautmann. P.E. <br />Ted K. Field, P.E . <br />Thomas R. An~erson, A.I.A. <br />Donald C. Burgardt, P.E. <br />Th omas E. Angus. P.E . <br />Ismael Martinez. P.E . <br />Michael P. Rau, P.E. Mark D. Wallis, P.E . <br />Philip J. Pyne, P.E . Miles B. Jensen. P.E. <br />Agnes M. Ring, A.IC.P. L. Phillip Gravel Ill, P.E . <br />Thomas W. Peterson, P.E. Karen L. Wiemeri, P.E. <br />Michael C. Lynch , P.E. Gary D. Kristofitz. P.E . <br />James R. Maland. P.E. F. Todd Foster, P.E. <br />Jerry D. Pertzsch . P.E . Keith R. Yapp, P.E . <br />Kenneth P. Anderson. P.E. Douglas J. Benoit. P.E . <br />Mark R. Rolfs, P.E. Shawn D. Gustafson. P.E . <br />Mark A. Seip, P.E. Cecilio Olivier. P.E . <br />Gary W . Marien, P.E. Charles A. Erickso n <br />Daniel J. Edgerton , P.E. Leo M . Pawelsky <br />Allan Rick Schmidt, P.E . Harlan M . Olson <br />Philip J. Caswell , P.E . James F. Engelhardt <br />"JUN '"' 2 C. 1893 <br />We have reviewed the soil boring logs and construction details for the proposed concrete <br />modular block retaining wall on Robert Owens' property. The proposal is to construct a <br />two tier wall with 3:1 (horizontal to vertical) intermediate slopes and geogrid restraints. <br />The previously constructed embankment was constructed at a 1:1 or 1.5:1 slope and has <br />subsequently failed. We feel that the proposed wall is feasible from an engineering <br />standpoint. <br />Due to the marginal soils in the area (some clayey silt), close construction supervision is <br />recommended to insure adequate compaction of the embankments. The soil should be <br />placed at near optimum moisture conditions. This may require that moisture correction <br />techniques be used if the soils are overly wet or, very unlikely, dry. <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 />~ :b.JJ~ <br />Shawn D . Gustafson, P .E. <br />2335 West Highway 36 • St. Paul, MN 55113 • 612-636-4600