ATTACHMENT 8FEDERAL COMMUNICATIONS COMMISSION (FCC)
COMPLIANCE STUDY ON
ELECTROMAGNETIC FIELDS
EXPOSURE
Prepared for:
Mastec
on behalf of
0§ at&t
Site Name: WAALD-003-E
Site ID: 17727-003-E
SnoPUD Pole # 26162262
47.80993° N, 122.33566° W
near
20901 76t" Avenue W
Edmonds, Washington, 98026
FCC COMPLIANCE:
AT&T is proposing to enhance its wireless communication service by installing a canister -shaped antenna
on top of a light pole at the location mentioned above. A radio equipment enclosure will be installed on
the same pole.
The proposed installation will comply with FCC standards and all Applicable Standards for RF Exposure.
The conclusion is based on information provided by Mastec/AT&T, on site measurement of existing RF
field strength and the RF power density calculations performed in this study. Members of the General
Public will not be exposed to hazardous levels of RF energy in the surrounding area of the facility. The
operation of the facility will contribute a maximum of 3.4% to existing cumulative Maximum Permissible
Exposure (MPE) levels on publicly accessible surfaces at ground level or in adjacent buildings.
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17727-003-E
RFSSRP
QUALIFICATION
June 18, 2020
Page 12
This report is an engineering statement confirming compliance. I am a Professional Engineer in electrical
engineering registered in the State of Washington, Oregon and California. I have been designing
electrical systems and writing RF exposure compliance reports for the last 20 years. The information
included and calculations performed herein are true and accurate to the best of my knowledge.
Sei Yuen Sylvan Wong, PE
Washington PE Reg. No. 37962
PROTOCOL
June 18, 2020
This study, and the calculations performed herein, is based on OET Bulletin 651 which adopts ANSI C95.1-
1992 and NCRP standards. In particular, equation 10 from section 2 of the guideline is used as a model
(in conjunction with known antenna radiation patterns) for calculating the power density at different
points of interest. This information will be used to judge the RF exposure level incident upon the general
population, and any employee present in the area. It should be noted that ground reflection of RF waves
has been taken into account.
FCC Maximum Permissible Exposure Levels
The FCC's maximum permissible exposure (MPE) is defined as "the rms and peak electric and magnetic
field strength, their squares, or the plane -wave equivalent power densities associated with these fields
to which a person may be exposed without harmful effect and with an acceptable safety factor level".
The FCC defines two exposure environments based on the awareness of persons who are being exposed.
RF safety compliance centers on management of these two environments.
' Cleveland, Robert F, et al. Evaluating Compliance with FCC Guidelines for Human Exposure to Radiofreguency
Electromagnetic Fields. OFT Bulletin 65, Edition 97-01, August 1997.
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General Population/Uncontrolled Exposure
June 18, 2020
Page 13
The General Population/Uncontrolled exposure applies to human exposure to RF fields when the general
public is 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 public always fall under this category when exposure is not
employment -related.
Occupational/Controlled Exposure
The Occupational/Controlled exposure applies to human exposure to RF fields when 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. These
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 action.
The FCC's MPE limits for the General Population/Uncontrolled and Occupational/ Controlled
environments are given in Table land Table 2, respectively. Figure 1 is a graph of both MPEs as functions
of frequency.
Table 1: MPE Limits for General Population/Uncontrolled Environment
Frequency Range
(MHz)
Electric
Field
Strength
(V/m)
Magnetic
Field
Strength
(A/m)
Power
Density
(mW/cm2)
Averaging Time
for I E 12, 1 H 1 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 —1500
--
--
f/1500
30
1500-100,000
--
--
1.0
30
f = frequency in MHz * = Plane wave equivalent power density
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RFSSRP
100
10
A
0.1
Table 2: MPE Limits for Occupational/Controlled Environment
Frequency
Electric
Magneti
Power
Averaging
Range
Field
c Field
Density
Time for
(MHz)
Strength
Strength
(mW/cmZ)
I E 12, 1 H 12,
(V/m)
(A/m)
or S
(Minutes)
0.3 — 3.0
614
1.63
(100)*
6
3.0 — 30
1842/f
4.89/f
(900/fZ)*
6
30 — 300
61.4
0.163
1.0
6
300 — 1500
--
--
f/300
6
1500— 100,000
--
--
5.0
6
f = frequency in MHz * = Plane wave equivalent power
density
Frequency (MHz)
June 18, 2020
14
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RFSSRP P a g e 15
In general, as specified in 47 C.F.R. 1.1307(b), as amended, when the FCC's guidelines are exceeded in
an accessible area due to the emissions from multiple fixed transmitters the following policy applies.
Actions necessary to bring the area into compliance with the guidelines are the shared responsibility of
all licensees whose transmitters contribution to the RF environment at the non -complying accessible
area exceeds 5% of the exposure limit (that applies to their particular transmitter) in terms of power
density or the square of the electric or magnetic field strength. This applies regardless of whether such
transmitters would, by themselves, normally be excluded from performing a routine environmental
evaluation. Owners of transmitter sites are expected to allow applicants and licensees to take
reasonable steps to comply with the FCC's requirements and, where feasible, should encourage
collocation of transmitters and common solutions for controlling access to areas where the RF exposure
limits might be exceeded.
RF Safety Signs
AT&T uses two types of RF safety signs:
• Alerting signs
• Information signs
Alerting Signs
Three types of alerting signs, NOTICE, CAUTION, and WARNING, associated with increasing exposure risk
relative to the applicable MPE limits are used. They announce the existence of potential RF exposure
hazards within the areas they demarcate. The formats of these signs follow the recommendations of the
ANSI and IEEE standards regarding colors, wording, and symbols.
AT&T operates antenna at this structure.
Above this point you are entering an area
where radio frequency (RF) fields may
exceedthe FCC General Population
exposure limits.
Follow safety guidelines for working In an
RF environment,
Keep 5ft. away from the fronts of the
antennas.
Contact AT&T at 800-638.2822, opt. 9, 3
and follow their Instructions prior to
performing any maintenance or repairs
above this point
This Is AT&T She USID
AM
rk&-j C0RE0NE
0 N S U S
CAUTION
Beyond This Point you are
entering a controlled area where
RF Emissions may exceed the
FCC Occupational Exposure
Limits
Obey all posted signs and site guidelines
for working in an RF environment
�W: FCC 47CFR 1.1307(b) AT&T Mobiery
Beyond This Point you are
entering a controlled area where
RF Emissions exceed the FCC
Controlled Exposure Limits
Failure to obey all posted signs and site
guidelines could result in serious injury
Ref. FCC 47CFR 1.1307(b) AT&T Mobiliry
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June 18, 2020
Page 1 6
NOTICE signs alert persons that they are attempting to access an area in which RF exposure levels may
exceed the General Population/Uncontrolled MPE.
CAUTION signs alert persons that they are attempting to enter an area in which RF exposure may
exceed the Occupational/Controlled MPE.
WARNING signs alert persons that they are attempting to enter an area in which the RF exposure may
exceed the Occupational/Controlled MPE by a factor of 10 or greater
The NOTICE sign should be installed on the post 4 feet below the antenna.
Information Signs
INFORMATION signs instruct persons on what to do and who to contact if they are in, or desire to enter,
an area where AT&T operates antennas. Several types of INFORMATION signs are used by AT&T, each
of which is identified by unique number.
Information Sign 1
INFORMATION
AT&T Mobility operates telecommunications antennas at this
location. Remain at least 3 feet away from any antenna and
obey all posted signs.
Contact the owner(s) of the antenna(s) before working closer
than 3 feet from the antenna.
Contact AT&T Mobility at 800-638-2822 prior to performing
any maintenance or repairs near AT&T antennas.
This is AT&T Mobility Site #
agement office if this door/hatch/gate is
oestapropiedad
se ubican antenas de telecomunicaciones
operadas por AT&T Mobility. Favor mantener una distancia
de no menos de 3 pies y obedecer todos los avisos.
Comuniquese con el propietario o los propietarios de las
antenas antes de trabajar o caminar a una distancia de
menos de 3 pies de la antena.
Comuniquese con AT&T Mobility 800-638-2822 antes de
realizar cualquier mantenimiento o reparaciones cerca de las
antenas de AT&T.
Esta es la estacion base n6mero
Favor comunicarse con la oficina de la administracion del
edificio si esta puerta o compuerta se encuentra sin
candado.
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RFSSRP
June 18, 2020
17
Information Sign 2
Antennas that are stand-alone (e.g., lamp posts, stadiums) in areas where there is little potential for
exceeding the General Population/Uncontrolled MPE except, perhaps, very close to the antenna. In this
case, the INFORMATION Sign 2 would be mounted close to the antenna in order to alert maintenance
workers. (Note: In areas where the potential exists for exceeding the GP MPE limits, additional
compliance action, including alerting signs, may be needed.).
INFORMATION
ACTIVE ANTENNAS ARE MOUNTED
❑ ON THE OUTSIDE FACE OF THIS BUILDING
❑ BEHIND THIS PANEL
❑ ON THIS STRUCTURE
STAY BACK A MINIMUM OF 3 FEET FROM THESE
ANTENNAS
Contact AT&T Mobility at and follow
their instructions prior to performing any maintenance
or repairs closer than 3 feet from the antennas.
This is AT&T MOBILITY site
Sign 2 www.radhaz.com AT&T Mobility
MITIGATION MEASURES:
Due to the mounting height of the proposed AT&T antenna, it would not be accessible to the general
public. No mitigation measures are necessary to comply with the FCC public exposure guidelines.
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RFSSRP
ON SITE MEASUREMENTS
June 18, 2020
18
The site was visited on June 16, 2020 at 11:47 am. The weather at the time of the visit was a cloudy
afternoon with a temperature of 57°F. All accessible areas of the site were inspected. Measurement
collection was performed using Narda Survey Meter and Broadband Probe (300kHz to 50 GHz) and was
consistent with FCC and Narda procedures in making slow sweeping motions over the area that a person
could occupy. In using this broadband instrument, the results represent the cumulative contributions of
all RF sources at the measurement locations. Narda Radiation meter NBM-550-S / F-0266 (Calibration
Date: June 21, 2018) and probe EA-5091 (NBM) (Calibration Date: June 21, 2018) were used to record
spatially averaged power density levels as a percentage of the FCC MPE General Population MPE limits.
Table 3 below is the collection of measurement readings.
Table 3: Measurement Readings are Spatial Average and Maximum as MPE % of the FCC General
Population Limits
Location
#
Site Reading
Location
#
Site Reading
Average %
Maximum %
Average %
Maximum %
1
0.0635
0.2314
8
0.0284
0.3122
2
0.2861
0.4404
9
0.1102
0.2597
3
0.2646
0.4666
10
0.0827
0.2262
4
0.3560
0.6344
11
0.0896
0.2174
5
0.2372
0.3985
12
0.2087
0.4142
6
0.2549
0.5483
13
0.2649
0.4263
7
0.2918
0.5040
Measurements taken during the site visit attest that the current maximum spatial average power density
reading is 0.36% of the MPE limit for general population/uncontrolled exposure in the surrounding area
of the proposed facility. There are no locations in the surrounding area near the facility that will have
RF exposure levels close to the MPE limit.
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N A. _
The site map below shows the measurement locations
June 18, 2020
19
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PREDICTIVE ANALYSIS
The following parameters have been considered in modeling this configuration:
June 18, 2020
Page 110
Ant #
Antenna
Antenna Model
Frequency (MHz)
Total ERP
ANT Centerline
AGL (ft)
1
Galtronics
GQ2412-06613
1900 / 2100 /
623 / 623 / 64
36'
5250
RF FIELD PREDICTION
Calculations have been made to predict RF field strength and power density levels around typical RF
sources. In order to evaluate the RF exposure level, the power densities at different locations of interest
have been examined. Equation 10 from Bulletin 65 is reproduced here as equation 1:
33.4 F2 ERP
S = R2 (1)
Where: S = Power density [MW/cm2]
ERP = Effective radiated power [W]
R = Distance [m]
F = Relative field factor (relative numeric gain)
For accessible areas at ground level, the maximum predicted power density level resulting from the
AT&T operations is 3.4% of the FCC General Population limits. The result represents worst -case
predication and are based on antennas operating at the maximum power level.
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This map shows exposure level at ground level and adjacent buildings
AM6
. Aim.& . ,-' f
*locations outside of white cloud are 0%-3.4%*
June 18, 2020
Page 111
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RFSSRP Page 112
1
This map shows the exposure level at the center of the antenna at 36' AGL
t J
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�r
AT&T ANTEN NA &
EQUIPMENT INSTALLATION
ON PROPOSED LIGHT POLE
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RFSSRP Page 113
Predicted MPE depicted at the center of the vertical zone that a person could occupy
RAD CENTER OF ANTENNA ±36'AGL I
3
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NOTICE SIGN INSTALLED 4' BELOW ANTENNA
ON BOTH SIDES OF THE POLE
RF Sign can be omitted with an
approved Sign Waiver Form
from the pole owner.
•
❑ :3%-100%
❑ 100%-500%
❑ > 500%
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RFSSRP
View facing East
COREONE
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