HomeMy WebLinkAboutNIER.205 S Mill St.2023.05Centerline Communications, LLC • 750 W Center St • West Bridgewater • MA • 02379 Page | 1
Radio Frequency Emissions Analysis Report
Verizon Wireless Rooftop Facility
May 23, 2023
Analysis Format: Theoretical Calculations
Site Name: ASPEN
Site ID: 393699
Site Address: 205 South Mill St. Space 110, Aspen, CO 81611
Statement of Compliance
Verizon Wireless will be compliant with FCC Regulations once the mitigation
measures recommended in this report are implemented.
393699 / ASPEN
Centerline Communications, LLC • 750 W Center St • West Bridgewater • MA • 02379 Page | 2
Contents
Overview ......................................................................................................................................... 3
Antenna Inventory ......................................................................................................................... 4
Calculation Methodology ............................................................................................................... 5
Analysis & Results .......................................................................................................................... 6
Compliance Actions ...................................................................................................................... 17
Conclusions ................................................................................................................................... 18
APPENDIX A: RF Signage Description Table ................................................................................ 19
APPENDIX B: FCC Rules & Regulations ........................................................................................ 21
APPENDIX C: Certifications .......................................................................................................... 24
393699 / ASPEN
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Overview
Centerline Communications, LLC (“Centerline”) has been contracted to provide a Radio Frequency (RF)
Analysis for the following Verizon Wireless rooftop facility to determine whether the facility is in
compliance with federal regulations regarding RF emissions. The applicable federal regulations are
detailed in Appendix B of this report. This analysis includes theoretical emissions calculations for all
Verizon Wireless equipment that will be installed at the site.
Analysis Site Data
Site ID: 393699
Site Name: ASPEN
Site Address: 205 South Mill St. Space 110, Aspen, CO 81611
Site Latitude: 39.189861
Site Longitude: ‐106.81994
Facility Type: Rooftop
Compliance Summary
Status: Verizon Wireless will be compliant with FCC Regulations
Upon Installation of Proposed Barriers and Signage
Verizon Max Modeled
% Maximum Permissible Exposure (MPE)
(General Population Limit):
202.15%
Composite Max Modeled
% Maximum Permissible Exposure (MPE)
(General Population Limit):
202.15%
Note: In addition to the Verizon antennas and radio equipment, there are antennas and radio equipment for
unknown carriers which have been included in this analysis as part of the overall site compliance determination.
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Antenna Inventory
The proposed antenna configuration for Verizon at this facility is shown below.
All calculations for this facility were performed assuming that all radios were running at full power and
were uncombined in their RF paths. FCC OET Bulletin 65 – Edition 97‐01 recommends that modeling of
this nature should be done as described to yield the most conservative theoretical analysis. Due to the
dynamic nature of many deployed systems, the “real world” values are anticipated to be significantly
lower than those shown in this report due to the conservative nature of the theoretical analysis.
Sector Operator Frequency Band
TX
Power/
Channel
(watt)
Tx
#
ERP
(watts) Antenna Make Antenna Model
Gain
(dBd) Az (°)
Antenna
Centerline
Height (ft)
A1 Verizon L700 29.992 4 146.47 JMA CX16OMI236-1C 1.05 0 42.67
A1 Verizon N850 29.992 2 69.94 JMA CX16OMI236-1C 0.85 0 42.67
A1 Verizon L850 29.992 2 69.94 JMA CX16OMI236-1C 0.85 0 42.67
A1 Verizon L1900 39.994 4 907.12 JMA CX16OMI236-1C 7.85 0 42.67
A1 Verizon L2100 19.998 4 421.34 JMA CX16OMI236-1C 7.55 0 42.67
A1 Verizon AWS3-2100 19.998 4 421.34 JMA CX16OMI236-1C 7.55 0 42.67
A1 Verizon C-Band 3600 160 2 568.58 JMA CX16OMI236-1C 2.95 0 42.67
2 Unknown 23000 0.1 1 716.14 GENERIC MICROWAVE 1FT 38.55 235 42.67
3 Unknown 23000 0.1 1 716.14 GENERIC MICROWAVE 1FT 38.55 235 42.67
4 Unknown 23000 0.1 1 716.14 GENERIC MICROWAVE 1FT 38.55 235 42.67
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Calculation Methodology
Centerline has performed theoretical calculations on all transmission equipment located on this facility.
All calculations have been performed using the RoofMaster® software from Waterford Consultants LLC.
This software performs calculations using a cylindrical model for very conservative power density
predictions within the near‐field of the antenna where the antenna pattern has not truly formed yet.
Within this area power density values tend to decrease based upon an inverse distance function. At the
point where it is appropriate for modeling to change from near‐field calculations to far‐field calculations
the power decreases inversely with the square of the distance. This modeling technique is accurate with
low antenna centerlines, such as rooftops, where persons can get close to the antennas and pass
through fields in close proximity.
The below calculation in Figure 1 shows the theoretical distribution of power over an imaginary cylinder
with equal power distribution in all directions.
Figure 1: Distribution of power over an imaginary cylinder in all directions
This model can be modified for directional antennas to show directionality of power distribution. This
formula will tend to be conservative as it assumes that all power is focused between the 3 dB power roll
off points as shown in Figure 2.
Figure 2: Distribution of power over an imaginary cylinder in all directions inside the half power roll off
points (HBW)
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Analysis & Results
Calculations performed based upon the data provided for this facility have produced results in some
areas of the rooftop that are above allowable FCC limits for exposure to RF emissions as specified by
federal standards.
Maximum Predicted Composite MPE Level on Site: % of MPE Limit:
Accessible General Population MPE Limits: 202.15%
Accessible Occupational MPE Limits: 40.43%
Maximum Ground Level Composite MPE Level: % of MPE Limit:
Ground Level General Population MPE Limits: 0.46%
Ground Level Occupational MPE Limits: 0.09%
Verizon Sector Alpha: Transmitting over Main Level % of MPE Limit:
Accessible General Population MPE Limits: 202.15%
Accessible Occupational MPE Limits: 40.43%
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Ground Level, All Carriers (0.00 ft.)
Emissions Thresholds for:
393699 / ASPEN
ALPHA
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Adjacent Building 1 / Lower Level, All Carriers (22.50 ft.)
Emissions Thresholds for:
393699 / ASPEN
ALPHA
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Adjacent Building 3 Lower Level, All Carriers (30.00 ft.)
Emissions Thresholds for:
393699 / ASPEN
ALPHA
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Main Level / Awning / Adjacent Building 2, All Carriers (34.38 ft.)
Emissions Thresholds for:
393699 / ASPEN
ALPHA
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Main Level / Awning / Adjacent Building 2, Verizon Transmitters (34.38 ft.)
Emissions Thresholds for:
393699 / ASPEN
ALPHA
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Adjacent Building 3, All Carriers (40.00 ft.)
Emissions Thresholds for:
393699 / ASPEN
ALPHA
393699 / ASPEN
Centerline Communications, LLC • 750 W Center St • West Bridgewater • MA • 02379 Page | 13
Adjacent Building 4, All Carriers (50.00 ft.)
Emissions Thresholds for:
393699 / ASPEN
ALPHA
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Centerline Communications, LLC • 750 W Center St • West Bridgewater • MA • 02379 Page | 14
Adjacent Building 5, All Carriers (77.50 ft.)
Emissions Thresholds for:
393699 / ASPEN
ALPHA
393699 / ASPEN
Centerline Communications, LLC • 750 W Center St • West Bridgewater • MA • 02379 Page | 15
Top Floor Level (10dB attenuation applied), All Carriers (22.50 ft.)
Emissions Thresholds for:
393699 / ASPEN
ALPHA
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Centerline Communications, LLC • 750 W Center St • West Bridgewater • MA • 02379 Page | 16
1 1 10 0
Signage Diagram
Signage for:
393699 / ASPEN
Existing Item
Signage Count
Proposed Item
0
All Access Points
ALPHA
10’ grid size
Proposed Barrier
× 9
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Compliance Actions
In order to ensure the Verizon Wireless facility is compliant with FCC regulations, the following
mitigation should be implemented:
Access Install a NOC Information and Guideline sign on the access ladder.
Alpha Sector Install (1) Notice sign on the antenna ballast mount.
Install a triangular 6‐segment barrier of alternating lengths 16’ and 5’
around the antenna ballast mount in the orientation indicated on the
‘Signage/Barrier Diagram’ on page 16. Install (9) Notice signs on that
proposed barrier ((1) Notice sign per proposed barrier stanchion).
Notes No MPE >5% of the GP limit on the ground was detected within this
assessment.
Ensure the proposed barriers are installed at least 6’ away from the
unprotected roof edges.
393699 / ASPEN
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Centerline Communications, LLC • 750 W Center St • West Bridgewater • MA • 02379 Page | 18
Conclusions
Centerline has performed a theoretical analysis for the Verizon Wireless facility ASPEN. The RF exposure
diagrams included in this report show that there are areas near the Verizon Wireless antenna that have
the potential to exceed the FCC General Population exposure limit. As detailed above, RF signage and
barriers have been recommended to ensure the site is compliant with FCC regulations.
Predictive modeling confirms that with the proposed Verizon Wireless facility in place, exposure levels
from the facility in all publicly accessible areas including at ground level, inside the subject building and
on adjacent buildings are in strict compliance with the federal allowable RF exposure limits for the
general public. The vertical antenna pattern of the typical panel antennas used by Verizon Wireless
project a vast majority of RF energy towards the horizon with very little energy being directed in a
downward direction. The energy directed downward is typically 100‐1000 times less than the energy in
the main beam which is being directed towards the horizon. Additionally, roof/building materials
significantly attenuate RF energy, typically by 10‐20 dB, which is a factor of 10‐100. Furthermore,
exposure drops off dramatically as you move away from transmitting antennas. Combining all these
factors together results in exposure levels in publicly accessible areas being compliant with allowable
limits by a substantial margin.
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APPENDIX A: RF Signage Description Table
393699 / ASPEN
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Sign Description
RF Guideline Sign
Gives guidelines on how to proceed in areas that may exceed either the
FCC’s General Population or Occupational exposure limits.
NOC Information Sign
Typically placed at access point to provides site identification and contact
information.
Blue Notice Sign
Used to inform individuals that they are entering an area that may exceed
the FCC’s General Population exposure limit. It must be placed so it is
visible from all approachable sides. It must also be outside of the area
predicted to exceed the limit so it can be read without standing within
the affected area.
Yellow Caution Sign
Used to inform individuals that they are entering an area that may exceed
the FCC’s Occupational exposure limit. It must be placed so it is visible
from all approachable sides. It must also be outside of the area predicted
to exceed the limit so it can be read without standing within the affected
area.
Orange Warning Sign
Used to inform individuals that they are entering an area that may exceed
10x the FCC’s Occupational exposure limit. It must be placed so it is
visible from all approachable sides. It must also be outside of the area
predicted to exceed the limit so it can be read without standing within
the affected area.
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393699 / ASPEN
Centerline Communications, LLC • 750 W Center St • West Bridgewater • MA • 02379 Page | 20
APPENDIX B: FCC Rules & Regulations
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All information used in this report was analyzed as a percentage of the Maximum Permissible Exposure
(% MPE) limits as detailed in 47 CFR § 1.1310 as well as Federal Communications Commission (FCC) OET
Bulletin 65 Edition 97‐01. The FCC MPE limits are typically expressed in units of milliwatts per square
centimeter (mW/cm2) or microwatts per square centimeter (µW/cm2). The exposure limits vary
depending upon the frequencies being utilized. The General Population/Uncontrolled MPE limit (in
mW/cm2) for frequencies between 300 and 1500 is defined as frequency (in MHz) divided by 1500
(fMHz/1500). Frequencies between 1500 and 100,000 MHz have a General Population/Uncontrolled MPE
limit of 1 mW/cm2 (1000 µW/cm2). The calculated power density at each sample point divided by the
limit at each calculated frequency provides a result in % MPE. Summing the calculated % MPE from all
contributors provides a cumulative % MPE at a particular sample point. Wireless carriers use different
frequency bands with varying MPE limits; therefore, it is useful to report results in terms of % MPE as
opposed to power density.
All results were compared to the FCC radio frequency exposure rules as detailed in 47 CFR § 1.1307(b) to
determine compliance with the MPE limits for General Population/Uncontrolled environments as
defined below.
General population/uncontrolled exposure limits apply to situations in which the general population
may be exposed or in which persons who are exposed as a consequence of their employment may not
be made fully aware of the potential for exposure or cannot exercise control over their exposure.
Therefore, members of the general population would always be considered under this category when
exposure is not employment related, for example, in the case of a telecommunications tower that
exposes persons in a nearby residential area.
Occupational/controlled exposure limits apply to situations in which persons are exposed as a
consequence of their employment and in which those persons who are exposed have been made fully
aware of the potential for exposure and can exercise control over their exposure. Occupational/
controlled exposure limits also apply where exposure is of a transient nature as a result of incidental
passage through a location where exposure levels may be above General Population/Uncontrolled
limits, as long as the exposed person has been made fully aware of the potential for exposure and can
exercise control over his or her exposure by leaving the area or by some other appropriate means.
Additional details can be found in FCC OET 65.
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Table 1: Limits for Maximum Permissible Exposure (MPE)
(A) Limits for Occupational/Controlled Exposure
Frequency Range
(MHz)
Electric Field Strength
(E)
(V/m)
Magnetic Field Strength
(H)
(A/m)
Power Density (S)
(mW/cm2)
Averaging Time [E]2,
[H]2, or S
(minutes)
0.3‐3.0 614 1.63 (100)* 6
3.0‐30 1842/f 4.89/f (900/f2)* 6
30‐300 61.4 0.163 1.0 6
300‐1,500 ‐‐ ‐‐ f/300 6
1,500‐100,000 ‐‐ ‐‐ 5 6
(B) Limits for General Population/Uncontrolled Exposure
Electric Field Strength
(E)
(V/m)
Magnetic Field Strength
(H)
(A/m)
Power Density (S)
(mW/cm2)
Averaging Time [E]2,
[H]2, or S
(minutes)
0.3‐1.34 614 1.63 (100)* 30
1.34‐30 824/f 2.19/f (180/f2)* 30
30‐300 27.5 0.073 0.2 30
300‐1,500 ‐‐ ‐‐ f/1,500 30
1,500‐100,000 ‐‐ ‐‐ 1.0 30
f = Frequency in (MHz)
* Plane‐wave equivalent power density
Frequency Range
(MHz)
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APPENDIX C: Certifications
393699 / ASPEN
I, Joe Yang, preparer of this report certify that I am fully trained and aware of 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. I have been
trained in the procedures and requirements outlined in Verizon’s FCC Regulatory Compliance Manual.
Joe Yang
5/23/2023
I, David C. Cotton, Jr., reviewer and approver of this report certify that I am fully trained and aware of
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. I have been trained in the procedures and requirements outlined in Verizon’s FCC
Regulatory Compliance Manual.
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