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�lJ 6rp l 1 V <br /> A.M. STRUCTURAL ENGINEERING <br /> 112 EAST MAPLE STREET <br /> RIVER FALLS, WI 54022 , <br /> � (715) 426-4930 <br /> November 15, 2006 � <br /> Ms. Lissa Tenuta � <br /> Sharratt Design &Company <br /> 464 Second Street ' . <br /> Suite 100 � <br /> Excelsior, MN 55331 <br /> Re: Drazen Residence. � <br /> Retaining Wall Observation <br /> A.M. Job#06241 <br /> Page 1 of 2 � <br /> Dear Lissa, <br /> Per your request, on November 14, 2006,we visited the Drazen Residence-3546 Ivy Place, <br /> Orono, Minnesota-with Mr. Steve Lemke of your office. While at the project site,we observed the <br /> existing boulder and timber retaining walls between the Drazen's home and the lakeshore. <br /> Based on our observations, I would like to inform you of our opinion as to the state of these walls. <br /> On November 14, 2006, Steve Lemke and myself inet with Mike and Mary Drazen at their - <br /> residence to observe the existing retaining structures between their house and the lakeshore. <br /> The Drazen's indicated that,the City of Orono has requested an engineer observe the retaining . <br /> walls and comment on their ability to perform, as the Drazen's are currently planning on removing <br /> the existing deck from the lakeshore. • <br /> From our observation of the retaining structures, it is our opinion that the support provided to the <br /> � timber retaining walls by the existing deck is,negligible. As such, careful removal of the deck <br /> should not hamper the existing retaining walls'ability to retain the soil that is currently being <br /> supported. However, upon removal of the deck itself,the area beneath it,that has been <br /> protected, should be studied to determine if it warrants erosion protection as a preventative <br /> measure. � <br /> Additionally, from our observation, the current retaining structures appear to be in generally good <br /> condition. In addition, it appears that these walls have been in place for quite some time, as large <br /> trees and tree stumps are located adjacent to the walls, as well as substantial surface vegetation <br /> observed to be present. Taking these factors into consideration, it is our feeling that these walls <br /> will continue to pertorm as in the past. To avoid excessive erosion and destabilization of the <br /> slope, it is our opinion that these retaining walls,trees and surface vegetation should remain in . <br /> place. . <br />