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Suite '1108 <br />MinneapoUs., MN 55421 <br />Tet 763-571-2500 <br />Fay, 763-571-1168 <br />www.LiLteig.com <br />January 28, 2010 <br />James Lehnhoff, AICP <br />Community Development Manager <br />City of Arden Hills <br />Subject: Structural Analysis of an Existing Self -Support Tower <br />Site: Arden Hills Self -Support Tower <br />Address: 1296 County Road F <br />Arden Hills, MN <br />Job No.: R10.00098 <br />Dear Mr. Lehnhoff: <br />Per our conversation, below is a more detailed explanation of the results of the structural <br />analysis with regards to the final page of the previously sent document. <br />It was stated in the report that the tower is currently at 97.4% capacity. This statement is <br />based on the Global Capacity of the tower. When individual elements of the tower are <br />looked at as indicated on the last page of the report it is noted that the controlling members <br />of the tower are the diagonal members which, although critical to the tower structural <br />integrity, are considered bracing members for the main supporting elements which are the <br />legs of the tower. As indicated on the last page, the leg members, which are considered <br />the main structural support members, for this tower are only stressed to 62.8% in its <br />existing condition. This indicates that there would be adequate capacity to add additional <br />antennas to this tower with minor modifications to some of the bracing elements. <br />Regarding the concrete foundation, as we discussed, we cannot make assumptions as to the <br />integrity of the existing foundation without a detailed investigation but would offer the <br />following statement. Typically concrete that is placed below grade will, assuming that <br />Minneapolis, MN # Detroit Lakes, MN #Fargo, ND * Bismarck, N * Sioux Falls, SD <br />