HomeMy WebLinkAboutMUP20-0001_RF_EmissionsCompliance Statement Based on information provided by AT&T Mobility and predictive modeling, the Skyway installation proposed by AT&T Mobility will be compliant with Radiofrequency Radiation Exposure Limits of 47 C.F.R. §§ 1.1307(b)(3) and 1.1310. RF alerting signage and restricting access to the Monopole to authorized climbers that have completed RF safety training is required for Occupational environment compliance. The proposed operation will not expose members of the General Public to hazardous levels of RF energy and will not contribute to existing cumulative MPE levels on walkable surfaces at ground or in adjacent buildings by 5% of the General Population limits.
Certification I, David C. Cotton, Jr., am the reviewer and approver of this report and am fully aware of and familiar with the Rules and Regulations of both the Federal Communications Commissions (FCC) and the
Occupational Safety and Health Administration (OSHA) with regard to Human Exposure to Radio Frequency Radiation, specifically in accordance with FCC’s OET
Bulletin 65. I have reviewed this Radio Frequency Exposure Assessment report and believe it to be both true and accurate to the best of my knowledge. General Summary The compliance framework is derived from the Federal Communications Commission (FCC) Rules and Regulations for preventing human exposure in excess of the applicable Maximum Permissible Exposure (“MPE”) limits. At any location at this site, the power density resulting from each transmitter may be expressed as a percentage of the frequency-specific limits and added to determine if 100% of the exposure limit has been exceeded. The FCC Rules define two tiers of permissible exposure differentiated by the situation in which the exposure takes place and/or the status of the individuals who are subject to exposure. General Population / Uncontrolled exposure limits apply to those situations in which persons may not be aware of the presence of
electromagnetic energy, where exposure is not employment-related, or where persons cannot exercise control over their exposure. Occupational / Controlled exposure limits apply to situations in which persons are exposed as a consequence of their employment, have been made fully aware of the potential for exposure, and can
exercise control over their exposure. Based on the criteria for these classifications, the FCC General Population limit is considered to be a level that is safe for continuous exposure time. The FCC General Population limit is 5 times more restrictive than the Occupational limits.
Radio Frequency Emissions Compliance Report For AT&T Mobility
Site Name: Skyway Site Structure Type: Monopole
Address: 4842 Media Way Latitude: 39.72772
Paradise, CA 95969 Longitude: -121.68031
Report Date: December 20, 2019 Project: New Build
Skyway - New Build 122019
Page 2 7430 New Technology Way, Suite 150 Frederick, Maryland 21703 (703) 596-1022 Phone www.waterfordconsultants.com
Table 1: FCC Limits
Frequency (MHz)
Limits for General Population/ Uncontrolled Exposure Limits for Occupational/ Controlled Exposure Power Density (mW/cm2) Averaging Time (minutes) Power Density (mW/cm2) Averaging Time (minutes)
30-300 0.2 30 1 6
300-1500 f/1500 30 f/300 6
1500-100,000 1.0 30 5.0 6
f=Frequency (MHz) In situations where the predicted MPE exceeds the General Population threshold in an accessible area as a result of emissions from multiple transmitters, FCC licensees that contribute greater than 5% of the aggregate MPE share responsibility for mitigation. Based on the computational guidelines set forth in FCC OET Bulletin 65, Waterford Consultants, LLC has
developed software to predict the overall Maximum Permissible Exposure possible at any location given the spatial orientation and operating parameters of multiple RF sources. The power density in the Far Field of an RF source is specified by OET-65 Equation 5 as follows:
𝑆𝑆= 𝐸𝐸𝐸𝐸𝐸𝐸𝐸𝐸4⋅𝜋𝜋⋅𝐸𝐸2 (mW/cm2)
where EIRP is the Effective Radiated Power relative to an isotropic antenna and R is the distance between the antenna and point of study. Additionally, consideration is given to the manufacturers’ horizontal and vertical antenna patterns as well as radiation reflection. At any location, the predicted power density in the Far Field is the spatial average of points within a 0 to 6-foot vertical profile that a person would occupy. Near field power density is based on OET-65 Equation 20 stated as 𝑆𝑆=�180𝜃𝜃𝐵𝐵𝐵𝐵�⋅100⋅𝑃𝑃𝑖𝑖𝑖𝑖𝜋𝜋⋅𝑅𝑅⋅ℎ (mW/cm2)
where Pin is the power input to the antenna, θBW is the horizontal pattern beamwidth and h is the aperture length.
Some antennas employ beamforming technology where RF energy allocated to each customer device is dynamically directed toward their location. In the analysis presented herein, predicted exposure levels are based on all beams at full utilization (i.e. full power) simultaneously focused in any direction. As this condition is unlikely to occur, the actual power density levels at ground and at adjacent structures are expected to be less that the levels reported below. These theoretical results represent worst-case predictions as all RF emitters are assumed to be operating at 100% duty cycle. For any area in excess of 100% General Population MPE, access controls with appropriate RF alerting signage
must be put in place and maintained to restrict access to authorized personnel. Signage must be posted to be visible upon approach from any direction to provide notification of potential conditions within these areas. Subject to other site security requirements, occupational personnel should be trained in RF safety and equipped with personal protective equipment (e.g. RF personal monitor) designed for safe work in the vicinity of RF emitters. Controls such as physical barriers to entry imposed by locked doors, hatches and ladders or other access control mechanisms may be supplemented by alarms that alert the individual and notify site
management of a breach in access control. Waterford Consultants, LLC recommends that any work activity in these designated areas or in front of any transmitting antennas be coordinated with all wireless tenants.
Skyway - New Build 122019
Page 3 7430 New Technology Way, Suite 150 Frederick, Maryland 21703 (703) 596-1022 Phone www.waterfordconsultants.com
Analysis AT&T Mobility proposes the following installation at this location:
• Install 9 proposed antennas
• Install 12 proposed RRUs The antennas will be mounted on a 71.4-foot monopole with centerlines 121 feet above ground level. Proposed
antenna operating parameters are listed in Appendix A. Other appurtenances such as GPS antennas, RRUs and hybrid cable below the antennas are not sources of RF emissions. Panel and microwave antennas have been installed at this site by other wireless operators. Operating parameters for these antennas considered in this analysis are also listed in Appendix A.
Figure 1: Antenna Locations
Power density decreases significantly with distance from any antenna. The panel-type antennas to be employed at this site are highly directional by design and the orientation in azimuth and mounting elevation, as documented, serves to reduce the potential to exceed MPE limits at any location other than directly in front of the antennas. For accessible areas at ground level, the maximum predicted power density level resulting
Skyway - New Build 122019
Page 4 7430 New Technology Way, Suite 150 Frederick, Maryland 21703 (703) 596-1022 Phone www.waterfordconsultants.com
from all AT&T Mobility operations is 0.2971% of the FCC General Population limits. Based on the operating parameters in Appendix A, the cumulative power density level at this location from all antennas is 0.4742% of
the FCC General Population limits. There are no apparent inhabited buildings or structures in the immediate area as depicted in Figure 1. Based on the operating parameters in Appendix A, the cumulative power density level at this location from all antennas is 0% of the FCC General Population limits.
Waterford Consultants, LLC recommends posting RF alerting signage with contact information (Caution 2B) at the base of the Monopole to inform authorized climbers of potential conditions near the antennas. These recommendations are depicted in Figure 2.
Figure 2: Mitigation Recommendations
Skyway - New Build 122019
Page 5 7430 New Technology Way, Suite 150 Frederick, Maryland 21703 (703) 596-1022 Phone www.waterfordconsultants.com
Appendix A: Operating Parameters Considered in this Analysis
Antenna #: Carrier: Manufacturer Pattern: Band:
Mech Az (deg):
Mech DT (deg): H BW (deg): Length (ft): TPO (W): Channels: Loss (dB): Gain (dBd): ERP (W): EIRP (W):
Rad Center (ft):
1 AT&T KATHREIN 80010966 01DT 700 100 0 66.7 8 40 4 0 13.15 3305 5422 121
1 AT&T KATHREIN 80010966 01DT 850 100 0 65 8 40 4 0 13.85 3883 6370 121
1 AT&T KATHREIN 80010966 2.5DT 1900 100 0 65.5 8 40 4 0 15.75 6013 9866 121
2 AT&T KATHREIN 80010966 01DT 700 100 0 66.7 8 40 4 0 13.15 3305 5422 121
2 AT&T KATHREIN 80010966 2.5DT 2100 100 0 59.9 8 40 4 0 16.55 7230 11861 121
3 AT&T KATHREIN 80010866 2.5DT 2300 100 0 73 8 25 4 0 15.35 3428 5623 121
4 AT&T KATHREIN 80010966 01DT 700 340 0 66.7 8 40 4 0 13.15 3305 5422 121
4 AT&T KATHREIN 80010966 01DT 850 340 0 65 8 40 4 0 13.85 3883 6370 121
4 AT&T KATHREIN 80010966 2.5DT 1900 340 0 65.5 8 40 4 0 15.75 6013 9866 121
5 AT&T KATHREIN 80010966 01DT 700 340 0 66.7 8 40 4 0 13.15 3305 5422 121
5 AT&T KATHREIN 80010966 2.5DT 2100 340 0 59.9 8 40 4 0 16.55 7230 11861 121
6 AT&T KATHREIN 80010866 2.5DT 2300 340 0 73 8 25 4 0 15.35 3428 5623 121
7 AT&T KATHREIN 80010966 01DT 700 220 0 66.7 8 40 4 0 13.15 3305 5422 121
7 AT&T KATHREIN 80010966 01DT 850 220 0 65 8 40 4 0 13.85 3883 6370 121
7 AT&T KATHREIN 80010966 2.5DT 1900 220 0 65.5 8 40 4 0 15.75 6013 9866 121
8 AT&T KATHREIN 80010966 01DT 700 220 0 66.7 8 40 4 0 13.15 3305 5422 121
8 AT&T KATHREIN 80010966 2.5DT 2100 220 0 59.9 8 40 4 0 16.55 7230 11861 121
9 AT&T KATHREIN 80010866 2.5DT 2300 220 0 73 8 25 4 0 15.35 3428 5623 121
10 Sprint RFS APXV9ERR18-C-02DT 850 0 0 80 6 25 4 0 11.9 1531 2512 50
10 Sprint RFS APXV9ERR18-C-00DT 1900 0 0 80 6 45 4 0 14.6 5132 8419 50
11 Sprint RFS APXVTM14 ALU-I20 00DT 2500 0 0 65 4.7 20 8 0 15.9 6153 10095 50
12 Sprint RFS APXV9ERR18-C-02DT 850 120 0 80 6 25 4 0 11.9 1531 2512 50
12 Sprint RFS APXV9ERR18-C-00DT 1900 120 0 80 6 45 4 0 14.6 5132 8419 50
13 Sprint RFS APXVTM14 ALU-I20 00DT 2500 120 0 65 4.7 20 8 0 15.9 6153 10095 50
14 Sprint RFS APXV9ERR18-C-02DT 850 240 0 80 6 25 4 0 11.9 1531 2512 50
14 Sprint RFS APXV9ERR18-C-00DT 1900 240 0 80 6 45 4 0 14.6 5132 8419 50
Skyway - New Build 122019
Page 6 7430 New Technology Way, Suite 150 Frederick, Maryland 21703 (703) 596-1022 Phone www.waterfordconsultants.com
Antenna #: Carrier: Manufacturer Pattern: Band:
Mech Az (deg):
Mech DT (deg): H BW (deg): Length (ft): TPO (W): Channels: Loss (dB): Gain (dBd): ERP (W): EIRP (W):
Rad Center (ft):
15 Sprint RFS APXVTM14 ALU-I20 00DT 2500 240 0 65 4.7 20 8 0 15.9 6153 10095 50
16 Unknown ANDREW VHLP4-11 11000 0 0 1.5 4 0.2 1 0 38.7 1462 2399 43
Colocated antenna parameters based on industry standards