DS REVIEWED BLD2022-0302+NEIR report+3.9.2022_3.55.24_PM+2728376NON -IONIZING ELECTROMAGNETIC EXPOSURE ANALYSIS
ENGINEERING CERTIFICATION FOR
T • • Mob ile •@
PROJECT: Modification to Existing Antennas
CARRIER SITE: SE01705E — N Firdale Villag/Dental
CROWN CASTLE SITE: 826146 — N Firdale Villag/Dental
SITE ADDRESS: 10014 238th Street SW
Edmonds, WA 98020
DATE: March 9, 2022
PREPARED BY:
m•
MORRISON HERSHFIELD
600 Stewart Street, Suite 200
Seattle, WA 98101
2 0 6 - 2 6 8 - 7 3 7 0
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INTRODUCTION
Morrison Hershfield has been retained by T-Mobile to evaluate a proposed T-Mobile
telecommunications site as described below. Evaluation is for compliance with current
Federal Communications Commission (FCC) and local rules regarding public exposure to
radiofrequency (RF) electromagnetic fields (EMFs).
PROJECT
The proposed T-Mobile project consists of an existing WCF (Wireless Communications
Facility) located at 10014 238th Street SW, Edmonds, WA 98020; Latitude and
Longitude: 47' 46' 59.25", -122' 22' 1.14". The planned improvements will include the
placement of new antennas as described below. These antennas will be mounted to the
existing mount assembly at top of a tower structure at 52' AGL worst condition to the
centerline of the antennas.
All antennas face outward and point directionally away. Therefore it is unlikely that
anyone other than authorized RF workers could approach near enough to any of the
transmit antennas to cause that person's RF exposure to exceed FCC limits. It is
expected that RF exposure conditions near ground level at the site, and at all adjacent
properties, due to the contributions from all transmitting antennas will be well below the
FCC public exposure limit.
PROPOSED EQUIPMENT
Type of Service: LTE / GSM / UMTS
Antennas:
Sector
Azimuth
Height
Description
Alpha:
0
52'
(1) New Commscope / FFVV-65B-R3-V1 TMO Panel Antenna
Beta:
120
52'
(1) New Commscope / FFVV-65B-R3-V1 TMO Panel Antenna
Gamma:
240
52'
(1) New Commscope / FFVV-65B-R3-V1 TMO Panel Antenna
T-Mobile Site SE01705E — N Firdale Villag/Dental
MH Project #: 220003900
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PROPOSED EQUIPMENT (cont)
Maximum Power: 6912 watts
CALCULATIONS
Calculations for RF power densities near ground level are based on the "Evaluating
Compliance with FCC Guidelines for Human Exposure to Radio Frequency
Electromagnetic Fields, OET Bulletin 65" Edition 97-01, August 1997; issued by the
Federal Communications Commission Office of Engineering & Technology.
Compliance is determined by comparing RF field predictions with the general
population/uncontrolled environment (i.e., "Public") Maximum Permissible Exposure limits
(MPEs) allowed by the FCC rules, as specified in CFR 47 §1.1310. The following formula
has been used to calculate the power densities at specific locations:
S = 0.36 x ERP / R2
Where:
S = power density (mW/cm2)
ERP = power in watts
R = distance to the center of the radiation antenna (ft)
Formula is based on Equation 9 on page 21 of OET Bulletin 65. It includes the effect of
ground reflections. The Effective Radiated Power (ERP) depends on the vertical antenna
pattern.
THEORETICAL ANALYSIS
All existing and proposed transmit antennas are highly directional and project the majority
of the transmitted RF energy horizontally and well above all nearby accessible areas.
The following theoretical calculations predict the peak exposure condition for a six-foot
person standing at the nearest approach to the transmit antennas. A six-foot tall person
standing on the ground near the base of the antenna support or building would be at least
approximately 46 feet below all of the existing and proposed transmit antennas.
T-Mobile Site SE01705E — N Firdale Villag/Dental
MH Project #: 220003900
CONTRIBUTION OF T-Mobile FACILITY TO RF EXPOSURE ENVIRONMENT
Based on information provided by T-Mobile RF Engineers, the maximum ERP from any
sector of the proposed T-Mobile facility will be less than or equal to 6912 watts with all
channels activated. Thus the worst -case downward ERP is 69.12 watt (i.e., 1/100th of
100 watts) from the facility.
By use of the power density formula previously described, with input values of 69.12 watt
downwards ERP, and a distance of 46 feet, the worst -case calculated power density at
head height from the T-Mobile facility to a six-foot person standing at ground level is
0.0117597 mW/cm2.
T-Mobile antennas will transmit and/or receive at different MHz frequency bands worst
case being the LTE at 600 MHz. The Public MPE limit for the LTE frequency transmitted
by this facility is 0.40 mW/cm2.
The worst -case calculated exposure condition resulting from the T-Mobile facility is the
power density divided by the Public MPE limit = 2.9399220% of the Public MPE limit.
All ground level areas are expected to have exposure conditions less than the calculated
Public MPE due to the proposed T-Mobile facility.
OTHER CARRIERS
The following are examples of wireless carriers providing service to the local area:
CDMA/LTE 700-2500 Mhz Sprint, Verizon, US Cellular
GSM/UMTS/LTE 600-2100 Mhz AT&T, T-Mobile
CONTRIBUTION OF OTHER EXISTING CARRIERS TO RF EXPOSURE
ENVIRONMENT
Based on our information, there is an unknown carrier currently collocated on the existing
structure. Worst case parameters of similar facilities in the area, the maximum ERP from
any sector of the existing antennas on the structure is less than or equal to 8000 watts
with all channels activated. Therefore the worst -case downward ERP is 8000 / 100 = 80
watts from the existing facility.
T-Mobile Site SE01705E — N Firdale Villag/Dental
MH Project #: 220003900
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1- By use of the power density formula previously described, with input values of 80 watts
downwards ERP, and a distance of 66 ft, the worst -case calculated power density at
head height from the existing Unknown facility #1 to a six-foot person standing at ground
level is 0.0066116 mW/cm2.
All of the existing antennas transmit and/or receive within the PCS, ESMR or Cellular
frequency band. The Public MPE limit for all frequencies at worst case scenario for the
purpose of this calculation is 0.47 mW/cm2.
The worst -case calculated exposure condition resulting from the existing Unknown facility
#1 is the power density divided by the Public MPE limit = 1.4167651% of the Public MPE
limit.
2- By use of the power density formula previously described, with input values of 80 watts
downwards ERP, and a distance of 56 ft, the worst -case calculated power density at
head height from the existing Unknown facility #2 to a six-foot person standing at ground
level is 0.0091837 mW/cm2.
All of the existing antennas transmit and/or receive within the PCS, ESMR or Cellular
frequency band. The Public MPE limit for all frequencies at worst case scenario for the
purpose of this calculation is 0.47 mW/cm2.
The worst -case calculated exposure condition resulting from the existing Unknown facility
#2 is the power density divided by the Public MPE limit = 1.9679300% of the Public MPE
limit.
All accessible ground level areas are expected to have exposure conditions less than the
calculated Public MPE due to this existing facility.
COLOCATED FACILITITES TOTAL MPE
The predicted maximum worst -case RF exposure conditions resulting from all proposed
and existing wireless facilities at all ground -level areas is the arithmetic sum of the
contributions from each facility:
2.9399220 For T-Mobile + 1.4167651 + 1.9679300 = 6.3246171 % of the Public
MPE limit allowed by FCC rules.
This worst -case calculated exposure level is well below the 100% FCC limit. The actual
exposure conditions are likely to be many times less than this worst -case value.
T-Mobile Site SE01705E — N Firdale Villag/Dental
MH Project #: 220003900
FCC COMPLIANCE
The general population/uncontrolled exposure near this facility, including persons at
ground level, surrounding properties, inside and on existing structures will have RF
exposure much lower than the "worst case" scenario, which is a small fraction of the MPE
limit.
Only, trained personnel will be allowed to access the T-Mobile antennas and equipment
for maintenance operations. It shall be the responsibility of T-Mobile and/or its
contractors to provide adequate occupational training making employees fully aware of
the potential for RF exposure, and to exercise control over their exposure that is within
their occupational/controlled limits.
The FCC has determined that at sites where multiple wireless facilities are co -located, the
responsibility for site -wide RF safety compliance is the shared responsibility of all
licensees whose facilities produce exposure conditions greater than 5% of the applicable
MPE exposure limit. Thus, a new applicant is responsible for compliance (or submitting
an environmental assessment) at a multiple -facility site only if the proposed facility, when
considered alone, would produce exposure conditions in excess of 5% of the MPEs.
Wireless facilities that produce less than 5% of the applicable MPE exposure limit at
accessible locations are considered to be exempt from further study.
As demonstrated in this report by worst -case exposure calculations, the proposed T-
Mobile facility is not part of a multiple wireless facility and will produce far less than 5%
of the applicable exposure limit for public environments. Therefore, pursuant to the
Commission's rules no further calculations, measurements or other RF studies are
required, and the proposed T-Mobile facility is presumed to be in compliance with the
FCC's RF exposure rules.
Because the proposed T-Mobile facility is in compliance with federal rules, it is also in
compliance with local regulations concerning RF exposure. The following is the complete
text of 47 U.S.C. § 332(c)(7)(B)(iv):
"No State or local government or instrumentality thereof may regulate the
placement, construction, or modification of personal wireless service facilities
on the basis of the environmental effects of radio frequency emissions to the
extent that such facilities comply with the Commission's regulations concerning
such emissions."
T-Mobile Site SE01705E — N Firdale Villag/Dental ■
MH Project #: 220003900
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CONCLUSIONS
Based on these calculations, the proposed WCF will comply with current FCC and local
rules and guidelines regarding human exposure to radio frequency electromagnetic fields.
This conclusion is based solely on the comparison of predicted RF conditions in specific
areas with the corresponding safe exposure limits set forth in the FCC rules. The FCC
exposure limits are based on recommendations by federal and private entities with the
appropriate expertise in human safety issues.
To avoid any misunderstanding, I hereby state that, to the best of my knowledge, belief
and professional judgment, this report represents an accurate appraisal of exposure to
RF EM fields based upon careful evaluation to the extent reasonably possible.
Respectfully Submitted
For the Firm,
�A OF W ASflI,. 1�
52
Jason Ceglia, k22.03.09 11:13:34-05'00'
Morrison Hershfield Corp.
T-Mobile Site SE01705E — N Firdale Villag/Dental M
MH Project #: 220003900