NS ORD-1996-033 Zoning Ordinance Text Amendments - Telecommunication Towers

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JULES COHEN & ASSOCIATES, P.C. CONSULTING ENGINEERS 38 WASHINGTON, D.C. 20036 Engineering Statement Page 2 Carrboro,_North Carolina Site Descri2tion The surveyed cellular site is located at 515 South Greensboro Street, Carrboro, Orange County, North Carolina. The geographic coordinates of the site, referenced to the 1983 North American Datum, are: 35°54'09"North Latitude, 790 04' 11" West Longitude. A 180-foot self- supporting tower has been erected at the site to support the KNKA293 base station antennas._,T wo Decibel Products, type DB810, transmitting antennas are mounted at the top of the tower with centerlines 187 feet above ground level (AGL). Six other antennas are mounted near the top of the tower, but these antennas are for receiving only. Access to the tower is restricted to authorized personnel by a fence with a lockable gate. Exposure Standards As stated earlier, analysis of-the data collected in this survey is based on two standards for human exposure to radio-frequency electromagnetic fields: ANSI C95.1-1982, the currently adopted FCC standard, and ANSMEEE C95.1-1992, the revision of ANSI C95.1-1982. The FCC is in the process of changing its rules to incorporate the revised standard, ANSUIEEE C95.1-1992, in place of the current standard, ANSI C95.1-1982. It is expected that the FCC will incorporate the revised standard into its rules with few changes. AN C95.1-1982 specifies maximum exposure in terms of frequency-dependent protection guides. The pn*wtion guides are concerned with total whole-body absorption of radio- frequency energy over any 0.1-hour period. All of the radio-frequency sources at the KNKA293 cellular spa are in dw 300 to 3000 megahertz(N4Hz) frequency range. The protection guide level for this frequency range corresponds to an average equivalent plane wave power density that may be calculated using the formula. r S 300