CCP 09-20-1999 - Laserfiche WebLink

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considered, the Tower has the capacity to safely withstand only 25 mph winds, . In 680 feet out of the 700-foot Tower, the Tower legs are overstressed to some extent. This is due to the fact that the Tower has a very severely bent shape in the wind. Most of the guy cables and all of the existing foundations are overstressed when ice accumulation is considered." That same report goes on to state that the base foundation and inner anchor are inadequate to support the Tower loading. Also, that the existing middle and outer anchor guy rods are insufficient to support the new reactions when Yz" radial ice is considered. 5. The minutes of the regular Planning Commission meeting of March 4, 1981, reflect Jim Cahill, engineer for Motorola, stating the 700-foot Tower will withstand 125 mph winds, will hold fifteen antennae and will have 3 sets of anchors. He also noted that a 2.0 safety factor would be built into the tower. 6. According to the Special Use Permit (pC#81-05), the project was to be constructed and operated in strict accordance with the documentation on file. That documentation included the Unarco-Rohn drawing of February 12, 1981, the Unarco-Rohn "Description of Computer Analysis for Guyed Tower by Moment Distribution" of February 13, 1981, and the Athens Construction, Inc., site plan of February 11, 1981. . The Unarco-Rohn drawing of February 12, 1981, includes a table showing the original Tower design loading. This table shows 5 UHF's with 3-6" S.A. at the top and again at the 660-foot elevation and the 620-foot elevation, No other antennas are shown. The Unarco-Rohn computer analysis also indicates all antennae located above the 600 foot level. From the engineering reports that were done by EEl in 1998, it appears that no less than 18 additional antennae are now located on the Tower. City code requires any additions or alterations to the tower require an amendment to the Special Use Permit and a Building Permit. A check of City files shows only one permit issued for the property at 1777 14th Street since the original installation. That permit was for electrical work regarding U.S. West antennae installation in 1998. 7. According to the Unarco-Rohn documents on file, the Tower was not designed to withstand Yz" of radial ice, as required by the Code at that time, but was a consideration in their computer analysis. .