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<br />. <br /> <br />. <br /> <br />. <br /> <br />..' <br /> <br />warded to <br />the outer <br />adequate. <br /> <br />Subterranean Engineering,Inc. to review <br />anchor design to determine if soils are <br />Modifications may be required. <br /> <br />Comments <br /> <br />The 700' Rohn 80 guyed tower located at Arden Hills, MN does <br />meet the specifications of TIA/EIA-222-F considering 80 mph <br />wind and no ice providing all information as supplied to EEl <br />being correct and current, feedlines are bundled and evenly <br />distributed as shown on our attached drawing 27366Al-l and <br />foundations are determined to be adequate by Subterranean <br />Engineering, Inc. for the increased reactions. If tower <br />loading is changed or altered in any way, we suggest an <br />additional analysis be completed. <br /> <br />We QQ recommend that the tower owner excavate adiacent 12 <br />the existinQ anchor shafts'1Q inspect ~ excessive rust. <br />please ~ the shafts should ~ inspected all ~ ~ 12 <br />the point when it enters the concrete. Caution 1Q n21 <br />disturb the shaft with mechanical eauipment ~ ~ A ~ <br />hoe. We would ~ to reiterate the importance ~ the <br />shafts should be the, first i1gm Qf concern before ~ Qf the <br />modifications are completed QL ~ proposed antennas ~ be <br />installed. <br /> <br />There are some criteria we feel you should be aware of when <br />reviewing our analysis and report. Due to the tubular <br />construction of this tower, it is difficult to tell the <br />amount of rust or deterioration that may have developed in <br />the tower members. <br /> <br />The tubular tower members can be ultrasonically 'tested to <br />determine the area of steel remaining. However to be abso- <br />lutely sure that no rusting is taking place, each tower leg <br />would have to be tested every square inch, which is not <br />economically feasible. <br /> <br />We are not implying that you do have rusting problems in the <br />SUbject tower, we are simply stating that we cannot guaran- <br />tee that no rusting is taking place and you should be aware <br />of this. Our stress ratios as shown in our analysis and in <br />the results section of this report are based on steel being <br />in new condition with no rusting or deterioration. <br /> <br />upon request Ehresmann Engineering Inc. will visit the <br />previouslY described tower site and inspect tower, lines, <br />and antennas for, compliance to this engineering analysis in <br />its entirety upon completion of project. Cost will be <br />quoted at time of request. <br /> <br />5 <br />