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<br />. Crown Castle International <br />288 Ft Self Support Tower Modification Letter <br />lETS Project Number 2005-70458 <br /> <br />May 6, 2005 <br />CCI au No. 816298 <br />Page 2 <br /> <br />Section Elevation Percent Capacity Used <br />Number (feet) Leg Diagonal Horizontal <br />T1 288 - 279 0.8 5.6 0.7 <br />T2 279 - 272 1.8 7.9 2.4 <br />T3 272 - 259 3.0 26.1 3.7 (b) <br />T4 259 - 247 7.7 28.6 7.3 <br />T5 247 - 237 17.8 (b) 26.9 7.1 <br />T6 237 - 232 7.3 10.0 13.9 <br />T7 232 - 222 8.5 20.8 10.4 (b) <br />T8 222 - 210 25.7 (b) 30.5 28.2 <br />T9 210 - 195 17.3 59.6 41.5 <br />T10 195 -183 35.4 (b) 27.2 15.3 <br />T11 183 - 171 16.2 50.6 16.4 (b) <br />T12 171-146 40.1 (b) 75.0 61.9 <br />T13 146 - 122 57.3 (b) 33.7 22.5 (b) <br />T14 122 - 96 54.8 (b) 55.2 17.5 <br />T15 96 - 72 55.1 (b) 53.0 58.8 <br />T16 72 - 52 65.9 (b) 44.1 102.2 <br />T17 52 - 32 74.8 (b) 48.3 49.3 <br />T18 32 - 0 63.6 (b) 52.3 (b) 68.3 (b) <br />Foundation SUFFICIENT <br /> <br />Table 2 - Tower Component Results (After Modifications) <br /> <br />(b) Indicates bolt design controls <br /> <br />The percent capacities shown above (excluding foundations) include the 1/3 increase in allowable <br />stresses as allowed by TINEIA-222-F. Capacities up to 105% are considered acceptable based on the <br />analysis procedures used. Foundation capacities are based on a full analysis of the foundation. <br /> <br />We at lETS appreciate the opportunity of providing our continuing professional services to you and <br />Crown Castle International. If you have any questions or need further assistance on this or any other <br />projects please give us a call. <br /> <br />Respectfully submitted, <br /> <br />/7 ;. A>.r ~ ~,;t<~ <br /> <br />~"""<'. .,/.-'-~ '" ~ <br />,,1' ,f/.'// l,' .(# ,..:"/j4'" <br />,.-.':;::'- i ~... ~" p' - " <br />~-"~ t ~..r'_~ '_ <br />/' <br />William A. Griswold, r., P.E. <br />Chief Engineer <br /> <br />G. Lance Cooke, P.E. <br />Senior Project Engineer <br /> <br />Attachment: <br />lETS Modification Drawings 2005-70458-01 through 2005-70458-06 <br />