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Engineers & Architects May 5, 1994 Ms. Jeanne A. Mabus th Building and Zoning Administrator City of Orono Post Office Box 66 Crystal Bay, Minnesota 55323 Re: Liljequist Variance File No. 139-1904 Dear Jeanne, Otto G. Bonestroo. P.E. Robert W. Rosene. P.E.• Joseph C. Anderlik. P.E. Marvin L. Sorvala. P.E. Richard E. Turner. P.E. Glenn R. Cook. P.E. Thomas E. Noyes. P.E. Robert G. Schunicht. P.E. Susan M. Eberlin. C.P.A. •Senior Consultant Howard A. Sanford. P.E. Keith A. Gordon, P.E. Robert R. Pfefferle, P.E. Agnes M. Ring, A.I.C.P. Philip J. Pyne. P.E. Thomas w Peterson. P.E. Richard W Foster, P.E. Michael C. Lynch, P.E. David 0. Loskota. P.E. James R. Maland, P.E. Robert C. Russek, A.I.A. Jerry D. Pertzsch. P.E. Jerry A. Bourdon, P.E. Scott J. Arganek. P.E. Mark A. Hanson, P.E. Kenneth P. Anderson. P.E. Michael T. Rautmann. P.E. Mark R. Rolfs. P.E. Ted K. Field. P.E. Mark A. Seip, P.E. Thomas R. Anderson. A.I.A. Gary W Morien, P.E. Donald C. Burgardt. P.E. Daniel J. Edgerton, P.E. Thomas E. Angus. P.E. A. Rick Schmidt. P.E. Ismael Martinez. P.E. Philip J. Caswell. P.E. Michael P. Rau. P.E. Mark D. Wallis. P.E. Miles 8. Jensen. P.E. L. Phillip Gravel. P.E. Karen L. Wiemeri. P.E. Gary D. Kristofitz. P.E. F. Todd Foster, P.E. Keith R. Yapp, P.E. Douglas J. Benoit. P.E. Shawn D. Gustafson. P.E. Cecilio Olivier. P.E. Paul G. Heuer, P.E. John P. Gorder. P.E. Charles A. Erickson Leo M. Pawelsky Harlan M. Olson James F. Engelhardt p~·":'EIVED MAY 9 1994 Ci ... F ORONO We have inspected the property and reviewed the certificate of survey submitted with the variance application for the proposed house on Eric & Shelly Liljequist's property. The information shows that the proposed house will require approximately 625 cubic feet of fill to be placed within the floodplain of Lake Minnetonka. The applicant has proposed to excavate approximately 6 inches over a 36 feet by 35 feet area adjacent to Birch Lane as compensatory floodplain storage. We do not recommend this location because it is has the highest elevation on the lot. To qualify for floodplain storage, the excavation must take place below the floodplain elevation of 931.5. To provide the 625 cubic yards required, the proposed location near Birch Lane would first have to be excavated down to the 931.5 elevation, then lowered an additional 6 inches to create floodplain storage. The total excavation in this location would be nearly 2 feet in depth. The side and rear yard areas presently have poor drainage. It is apparent that the low areas on the lot drain solely by seepage into the soil. Although the proposed improvements will not increase the runoff on the property, the drainage could be improved by excavating a shallow ditch out to the lake. If the excavation is done either west or north of the house, nearly all of the excavation would qualify as floodplain storage. The excavation should be graded to drain around the west side of the house and out to the lake shore. Prior to the work, silt fence should be installed near the lake for erosion control. The disturbed area should be seeded or sodded shortly after the work has been completed. We see no adverse impacts on the property from either the fill placement or excavation, if it is done in this manner. Please contact me at this office if you have any questions regarding this matter. Yours very truly, BONESTROO, ROSENE, ANDERLIK & ASSOCIATES, INC. JL :t. LI~ Shawn D. Gustafson, P .E. 2335 West Highway 36 •St.Paul, MN 55113 • 612-636-4600 H