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CRAN RWOR WAEVT 004-B New Build 07292019 <br />General Summary <br />AT&T Mobility has contracted Waterford Consultants, LLC to conduct a Radio Frequency Electromagnetic <br />Compliance assessment of the CRAN_RWOR_WAEVT_004-B site located 4020 Colby Avenue, Everett, WA <br />98201. This report contains information about the radio telecommunications equipment to be installed at this <br />site and the surrounding environment with regard to RF Hazard compliance. The compliance assessment is <br />based on installation designs, observational data collected on site and operational parameters provided by <br />AT&T Mobility. <br />The compliance framework is derived from the Federal Communications Commission (FCC) Rules and <br />Regulations for preventing human exposure in excess of the applicable Maximum Permissible Exposure <br />("MPE") limits. At any location at this site, the power density resulting from each transmitter may be expressed <br />as a percentage of the frequency -specific limits and added to determine if 100% of the exposure limit has been <br />exceeded. The FCC Rules define two tiers of permissible exposure differentiated by the situation in which the <br />exposure takes place and/or the status of the individuals who are subject to exposure. General Population / <br />Uncontrolled exposure limits apply to those situations in which persons may not be aware of the presence of <br />electromagnetic energy, where exposure is not employment -related, or where persons cannot exercise control <br />over their exposure. Occupational / Controlled exposure limits apply to situations in which persons are <br />exposed as a consequence of their employment, have been made fully aware of the potential for exposure, <br />and can exercise control over their exposure. <br />Limits for General Population/ Uncontrolled Exposure <br />Limits for OccupationaY Controlled Exposure <br />Frequency <br />MHz <br />Power Density <br />mW/cm' <br />Averaging Time <br />minutes <br />Power Density <br />mW/ems <br />Averaging Time <br />minutes <br />30-300 <br />0.2 <br />30 <br />1 <br />6 <br />300-1500 <br />V1500 <br />30 <br />f/300 <br />6 <br />1500-100,000 <br />1.0 <br />30 <br />6.0 <br />6 <br />f=Frequency (MHz) <br />In situations where the predicted MPE exceeds the General Population threshold in an accessible area as a <br />result of emissions from multiple transmitters, FCC licensees that contribute greater than 5% of the <br />aggregate MPE share responsibility for mitigation. <br />Based on the computational guidelines set forth in FCC Office of Engineering and Technology, Bulletin 65 <br />("OET65"), Waterford Consultants, LLC has developed software to predict the overall Maximum Permissible <br />Exposure possible at any particular location given the spatial orientation and operating parameters of <br />multiple RF sources. The power density in the Far Field of an RF source is specified by OET-65 Equation 5 <br />as follows: <br />EIRP <br />S = Rz (mW/cmz) <br />4n• <br />where EIRP is the Effective Radiated Power relative to an isotropic antenna and R is the distance between <br />the antenna and point of study. Additionally, consideration is given to the manufacturers' horizontal and <br />vertical antenna patterns as well as radiation reflection. At any location, the predicted power density in the <br />Far Field is the spatial average of points within a 0 to 6 foot vertical profile that a person would occupy. <br />Near field power density is based on OET-65 Equation 20 stated as <br />_ — (1801 100 - Rn z <br />S n - R - h (mW/cm ) <br />Page 2 <br />Waterford Consultants, LLC • 201 Loudoun Street Southeast Suite 300 • Leesburg, Virginia 20175 • 703.596.1022 <br />