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C <br /> Ehries m a n n 4400 West 31 st St.-Yankton,SD 57078 <br /> Engineering Inc. Phone:(605)665-7532 Fax:(605)665-9780 <br /> d Associates E-Mail:eei@byelectric.com <br /> Web Address:httpJ/sdibi.northern.odu/ehresmann <br /> November 23, 1999 <br /> Mr. Dan Vaughan <br /> Arden Towers, Inc. <br /> 3440 Bayside Road <br /> Orono, MN 55356 <br /> Ph: 612-473-3660 <br /> Fax: 612-473-3880 <br /> Subject: 700 ' Rohn 80 Guyed Tower <br /> Site: Arden Hills., MN <br /> EEI JO: 27366-99 (Revision 8) <br /> Dear Mr. Vaughan, <br /> We: have completed our. revised structural stress analysis of <br /> the above described tower per your request. All information <br /> required to complete our structural analysis was furnished <br /> to EEI by your office. <br /> our chrrent aealvsis based qp. an enna and feedline info - <br /> matione ou o Mice dated November 16, <br /> 19 FeeYne pro ec Ne a eas, were calculated` in , accord- <br /> ance�� withs„ frem your office,dated .10/12/98 indicating <br /> : . _.. <br /> th t ail fe'a nes are Bundled and evenly distributed on "t ie <br /> ( tower' races. <br /> However, pe photos dated 10/19/99 furnished to our office <br /> the "feedliies' appear to not. be bundled as you had indicated. <br /> For ." the subject tower to agree with our analysis <br /> considerations and results , the��,'#eediines must .be installed <br /> as shown on our attached drawing 27366A1-1. <br /> As stated in previous reports, at the time this tower was <br /> erected it was rated for installation up to 800 ft depending <br /> on member sizes and tower loading. The subject t -w�er. is <br /> therefore approaching the limiting height and +doesle more <br /> lo'a ' the W"at was .originally designed for. <br /> Therefore, it is our opinion that even though the stress <br /> ratios indicate additional loading can be installed on the <br /> subject tower, 'we suggest all criteria outlined in this <br /> Antenna Support Structures-Guyed and Self Sepporting 7buners and Monopoles-Steel Fabrication <br /> Structural Analysis-Inspection-Specifications-Project Management-Detailing-PK Certification <br />