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SUMMIT NeQce/bpandea&w00-6 <br /> Manufacturing, LLC <br /> 225 Kwanis Blvd.,West Hazleton,PA 18201 (888)847.8537 fax(888)460-6885 <br /> March 28,2002 <br /> Mr.Richard P.Joyal,Jr. <br /> Seacoast,LP <br /> 19 Brentwood Ln. <br /> Yarmouthport MA <br /> 02675 <br /> Re: Structural Design of a Fall Zone Communication Pole <br /> 150-ft Monopole,6 carriers <br /> Site:Mashpee <br /> Dear Mr. Joyal: <br /> We understand that there may be some concern on the part of local building officials <br /> regarding the potential for failure of communication poles. Communication structures are <br /> designed in accordance with the Electronic Industries Association/Telecommunications <br /> Industries Association Standards ElA/I7A-222-F, "Structural Standards for Steel Antenna <br /> Towers and Antenna Supporting Structures." This is a nationally recognized standard and is <br /> modeled after the American National Standards Institute document ANSI A58.1. The ANSI <br /> standard is based upon equations that were developed using wind tunnel testing to accurately <br /> predict the effect that wind has on poles.. This ANSI standard is now known as ASCE-7. The <br /> EIA/TIA standard was developed by professional engineers experienced in the design of <br /> communication structures. Much of these specific design criteria are often not available in <br /> local building codes. <br /> Summit Manufacturing will design a monopole that will meet a wind velocity required by the <br /> EIA/TIA manual. The design will also comply with the latest version of the BOCA code. <br /> The basic wind velocity is not a peak gust velocity but is the "fastest mile" wind velocity. <br /> That means it is an average velocity based upon the time it takes the fastest wind to travel one <br /> (1)mile. A gust factor is also included in the wind pressure calculations. The wind velocity is <br /> measured at 33 feet above grade with escalation factors that, in essence, increase the wind <br /> velocity with the height of the pole. The wind velocity is a design wind velocity,which means <br /> that the pole will safely withstand the full design wind velocity and still maintain an additional <br /> load capacity know as a "Safety Factor." Radial ice accumulation of%:"is also accounted for <br /> in the design. <br /> The safety factors used to design,communication poles are the same factors used in building <br /> design. A safety factor of 1.25 is specified by the American Institute of Steel Construction <br /> (AISC) and a factor of 1.3 is specified by the American Concrete Institute (ACI). These <br /> Sumrmt Manukcwnng,LLC 1 <br />