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7A-~ AT&T Wireless. Proposed Base Station (Site No. SNFCCA1801) 2325 Euclid Avenue. Redwood City, California Statement of Hammett & Edison, Inc., Consulting Engineers The firm of Hammett & Edison, Inc., Consulting Engineers, has been retained on behalf of AT&T Wireless, a personal wireless telecommunications carrier, to evaluate the base station (Site No. SNFCCAI801) proposed to be located at 2325 Euclid Avenue in Redwood City, California, for compliance with appropriate guidelines limiting human exposure to radio frequency ("RF") electromagnetic fields. Prevailing Exposure Standards The U.S. Congress requires that the Federal Communications Commission ("FCC") evaluate its actions for possible significant impact on the environment. In Docket 93-62, effective October 15, 1997, the FCC adopted the human exposure limits for field strength and power density recommended in Report No. 86, "Biological Effects and Exposure Criteria for Radiofrequency Electromagnetic Fields," published in 1986 by the Congressionally chartered National Council on Radiation Protection and Measurements ("NCRP"). Separate limits apply for occupational and public exposure conditions, with the latter limits generally five times more restrictive. The more recent Institute of Electrical and Electronics Engineers ("IEEE") Standard C95.1-1999, "Safety Levels with Respect to Human Exposure to Radio Frequency Electromagnetic Fields, 3 kHz to 300 GHz," includes nearly identical exposure limits. A summary of the FCC's exposure limits is shown in Figure 1. These limits apply for continuous exposures and are intended to provide a prudent margin of safety for all persons, regardless of age, gender, size, or health. The most restrictive limit for exposures of unlimited duration to radio frequency energy for several personal wireless services are as follows: Personal Wireless Service ADDroX. Frequency OccuDational Limit Public Limit Personal Communication ("PCS") 1,950 MHz 5.00 mW/cm2 1.00 m W/cm2 Cellular Telephone 870 2.90 0.58 Specialized Mobile Radio 855 2.85 0.57 [most restrictive frequency range] 30-300 1.00 0.20 General Facility Requirements Base stations typically consist of two distinct parts: the electronic transceivers (also called "radios" or "cabinets") that are connected to the traditional wired telephone lines, and the passive antennas that send the wireless signals created by the radios out to be received by individual subscriber units. The transceivers are often located at ground level and are connected to the antennas by coaxial cables about I inch thick. Because of the short wavelength of the frequencies assigned by the FCC for wireless services, the antennas require line-of-sight paths for their signals to propagate well and so are ~"; ;:.~~ HAMMETI & EDISON, INC " '.:.'~:;;;: CO:\Sl'LTl:\G Et>:Cl:-':EERS ¿::; L;:..- SA;'; FRA!\;CISCO ATl801597 Page I of4 ,........ .....0...-....".........."--'--' "-'."T"""""'"