RF Report (BLD-2021-1840)
ELECTROMAGNETIC ENERGY (EME) EXPOSURE REPORT
Site Name:
Site ID:
USID:
FA Location:
Site Type:
Location:
Latitude (NAD83):
Longitude (NAD83):
Report Completed:
AT&T M-RFSC
Prepared By:
Central Cupertino
CCL00737
13192
10095833
Rooftop
10101 North De Anza Boulevard
Cupertino, CA 95014
37.3238333
-122.0331111
August 13, 2021
Casey Chan
Prepared for: AT&T Mobility
c/o J5 Infrastructure.
1150 Ballena Boulevard
Suite #259
Alameda, CA 94501
OSC Engineering Inc. Page 2/16
Executive Summary
Site Compliance Conclusion
The AT&T site CCL00737 located at 10101 North De Anza Boulevard Cupertino, CA 95014
will comply with FCC Guidelines.
Occupational Safety & Compliance Engineering (OSC Engineering) has been contracted by J5 Infrastructure, Inc. to
conduct an RF (radio frequency) computer simulated analysis. The Federal Communications Commission (FCC) has
set limits on RF energy exposed to humans on a wireless cell site. The FCC has also mandated that all RF wireless sites
must be in compliance with the FCC limits and a compliance check should be performed routinely to ensure site
compliance. Per AT&T Policy simulations are performed at 75% duty cycle. RoofMaster software was utilized in the
creation of this report.
OSC Engineering uses the FCC OET-65 as well as AT&T Standards to make recommendations based on results and
information gathered from drawings and Radio Frequency Data Sheets.
A site-specific compliance plan is recommended for each transmitting site. This report serves as a single piece of the
overall compliance plan.
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Site Overview and Description
• The antennas are mounted on a rooftop
• The site consists of four (4) sectors with a total of fifteen (16) antennas
• The site is within a secure rooftop
• The site is not co-located
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Compliance Results of the Proposed Site (theoretical simulation)
A result over 100% does not make a site out of compliance with FCC guidelines. For results over 100% of the FCC Limit,
further remediation is required to consider the site compliant per FCC Guidelines. See the report entitled
RECOMMENDATIONS for compliance actions required for FCC and AT&T Compliance. Areas exceeding the FCC Limit are
demarcated with barriers and appropriate signage. Areas Outside of the demarcated areas are below the FCC Limits
(under 100% GP). The remediation actions bring the site into compliance. Results are given in terms of the FCC General
Population. Please see the page entitled FCC MPE Limits (from OET-65) for further information. On-site measurements may
yield different results, as antennas do not always operate at full capacity.
Maximum simulated RF Exposure Level from (AT&T antennas @ roof):
5673.91 % FCC General Population MPE Limit
Maximum simulated RF Exposure Level from (AT&T antennas @ ground):
1.86 % FCC General Population MPE Limit
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Antenna Inventory
All technical data and specifications shown below are collected from drawings and/or documents provided by the client, as well as from online
databases and/or a visit to this facility. Unknown wireless transmitting antennas are simulated using conservative values when information is not available.
Antenna Operator
Frequency
(MHz)Antenna Type Antenna Make Antenna Model
Azimuth
(°T)
Ground
(Z) (Rad) (ft)
Rooftop
(Z) (Rad) (ft)
A1 AT&T 5G 39000 Panel Ericsson AIR5331 5G NR 20 57 7
A2 AT&T UMTS 850 Panel Quintel QS4658-3 20 57 7
A2 AT&T LTE B29 700 Panel Quintel QS4658-3 20 57 7
A2 AT&T LTE 2300 Panel Quintel QS4658-3 20 57 7
A3 AT&T LTE B14 700 Panel Commscope NNHH-65A-R4 20 57 7
A3 AT&T LTE / 5G 2100 Panel Commscope NNHH-65A-R4 20 57 7
A4 AT&T LTE B12 700 Panel Commscope NNHH-65A-R4 20 57 7
A4 AT&T 5G 850 Panel Commscope NNHH-65A-R4 20 57 7
A4 AT&T LTE / 5G 1900 Panel Commscope NNHH-65A-R4 20 57 7
A5 AT&T Cband 3700 Panel Ericsson AIR6449 N77D 20 57 7
B1 AT&T 5G 39000 Panel Ericsson AIR5331 5G NR 0 57 7
B2 AT&T UMTS 850 Panel Quintel QS4658-3 260 57 7
B2 AT&T LTE B29 700 Panel Quintel QS4658-3 260 57 7
B2 AT&T LTE 2300 Panel Quintel QS4658-3 260 57 7
B3 AT&T LTE B14 700 Panel Commscope NNHH-65A-R4 260 57 7
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Antenna Operator
Frequency
(MHz)Antenna Type Antenna Make Antenna Model
Azimuth
(°T)
Ground
(Z) (Rad) (ft)
Rooftop
(Z) (Rad) (ft)
B3 AT&T LTE / 5G 2100 Panel Commscope NNHH-65A-R4 260 57 7
B4 AT&T LTE B12 700 Panel Commscope NNHH-65A-R4 260 57 7
B4 AT&T 5G 850 Panel Commscope NNHH-65A-R4 260 57 7
B4 AT&T LTE / 5G 1900 Panel Commscope NNHH-65A-R4 260 57 7
B5 AT&T Cband 3700 Panel Ericsson AIR6449 N77D 260 57 7
C1 AT&T UMTS 850 Panel Quintel QS4658-3 140 57 7
C1 AT&T LTE B29 700 Panel Quintel QS4658-3 140 57 7
C1 AT&T LTE 2300 Panel Quintel QS4658-3 140 57 7
C2 AT&T LTE B14 700 Panel Commscope NNHH-65A-R4 140 57 7
C2 AT&T LTE / 5G 2100 Panel Commscope NNHH-65A-R4 140 57 7
C3 AT&T LTE B12 700 Panel Commscope NNHH-65A-R4 140 57 7
C3 AT&T 5G 850 Panel Commscope NNHH-65A-R4 140 57 7
C3 AT&T LTE / 5G 1900 Panel Commscope NNHH-65A-R4 140 57 7
C4 AT&T Cband 3700 Panel Ericsson AIR6449 N77D 140 57 7
C5 AT&T 5G 39000 Panel Ericsson AIR5331 5G NR 140 57 7
E1 AT&T 5G 39000 Panel Ericsson AIR5331 5G NR 230 57 7
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FCC Regulations and Guidelines from OET 65
When considering the contributions to field strength or power density from other RF sources, care should be taken to
ensure that such variables as reflection and re-radiation are considered. In cases involving very complex sites predictions
of RF fields may not be possible, and a measurement survey may be necessary The process for determining compliance
for other situations can be similarly accomplished using the techniques described in this section and in Supplement A to
this bulletin that deals with radio and television broadcast operations. However, as mentioned above, at very complex
sites measurements may be necessary.
In the simple example shown in the below diagram, it is desired to determine the power density at a given location X
meters from the base of a tower on which are mounted two antennas. One antenna is a CMRS antenna with several
channels, and the other is an FM broadcast antenna. The system parameters that must be known are the total ERP for
each antenna and the operating frequencies (to determine which MPE limits apply). The heights above ground level for
each antenna, H1 and H2, must be known in order to calculate the distances, R1and R2, from the antennas to the point
of interest. 1
1 OET Bulletin 65, Evaluating Compliance with FCC Guidelines for Human Exposure to Radiofrequency Electromagnetic Fields, Page 37- 38
OSC Engineering Inc. Page 8/16
Inverse Square Law
The inverse-square law, in physics, is any physical law stating that a specified physical quantity or intensity is inversely
proportional to the square of the distance from the source of that physical quantity. The fundamental cause for this can
be understood as geometric dilution corresponding to point-source radiation into three-dimensional space
The inverse-square law generally applies when some force, energy, or other conserved quantity is evenly radiated
outward from a point source in three-dimensional space. Since the surface area of a sphere (which is 4πr2 ) is proportional
to the square of the radius, as the emitted radiation gets farther from the source, it is spread out over an area that is
increasing in proportion to the square of the distance from the source.2
3
4
2 https://en.wikipedia.org/wiki/Inverse-square_law
3 http://hyperphysics.phy-astr.gsu.edu/hbase/Forces/isq.html
4 https://www.nde-ed.org/GeneralResources/Formula/RTFormula/InverseSquare/InverseSquareLaw.htm
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Certification
The undersigned is a Professional Engineer, holding a California Registration No. E22553
Reviewed and approved by:
Takeshi Tsuji, PE
Date: August 13, 2021
The engineering and design of all related structures as well as the impact of the antennas on the
structural integrity of the design are specifically excluded from this report’s scope of work. This report’s
scope of work is limited to an evaluation of the Electromagnetic Energy (EME) RF emissions field
generated by the antennas listed in this report. When client and others have supplied data, it is
assumed to be correct.
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FCC MPE Limits (from OET-65)
Occupational/controlled5 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 (see below), 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. As discussed later, the occupational/controlled exposure limits also apply to amateur radio operators and
members of their immediate household.
General population/uncontrolled6 exposure limits apply to situations in which the general public 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 public 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.
5 OET-65 “Evaluating Compliance with FCC Guidelines for Human Exposure to Radiofrequency Electromagnetic Fields pg. 9.
6 OET-65 “Evaluating Compliance with FCC Guidelines for Human Exposure to Radiofrequency Electromagnetic Fields pg. 9.
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Limits for Maximum Permissible Exposure (MPE)7
“The FCC Exposure limits are based on data showing that the human body absorbs RF energy at some frequencies more
efficiently than at others. The most restrictive limits occur in the frequency range of 30-300MHz where whole-body
absorption of RF energy by human beings is most efficient. At other frequencies whole-body absorption is less efficient,
and, consequently, the MPE limits are less restrictive.”8
7 OET-65 “FCC Guidelines Table 1 pg. 72.
8 OET-65 “FCC Guidelines for Evaluating Exposure to RF Emissions”, pg. 8
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Limits for Maximum Permissible Exposure (MPE) continued 9
“MPE Limits are defined in terms of power density (units of milliwatts per centimeter squared: mW/cm2), electric field
strength (units of volts per meter: V/m) and magnetic field strength (units of amperes per meter: A/m). In the far-field of a
transmitting antenna, where the electric field vector (E), the magnetic field vector (H), and the direction of propagation
can be considered to be all mutually orthogonal (“[plane-wave” conditions], these quantities are related by the
following equation:
9 OET-65 “FCC Guidelines Table 1 pg. 72.
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Limitations
OSC Engineering completed this report based on information and data provided by the client and on-site data
collection. The data provided by the client is assumed to be accurate. This report is completed by OSC Engineering to
determine whether the wireless communications facility complies with the Federal Communications Commission (FCC)
Radio Frequency (RF) Safety Guidelines. The Office of Engineering and Technology (OET-65) Evaluating Compliance with
FCC Guidelines for Human Exposure to Radiofrequency Electromagnetic Radiation has been prepared to provide
assistance in determining whether proposed or existing transmitting facilities, operations or devices comply with limits for
human exposure to radiofrequency (RF) fields adopted by the Federal Communications Commission (FCC)10. As the site is
being upgraded and changed this report will become obsolete. Use of this document will not hold OSC Engineering Inc.
nor it’s employees liable legally or otherwise. This report shall not be used as a determination as to what is safe or unsafe
on a given site. All workers or other people accessing any transmitting site should have proper EME awareness training.
This includes, but is not limited to, obeying posted signage, keeping a minimum distance from antennas, watching EME
awareness videos and formal classroom training.
10 OET-65 “FCC Guidelines for Evaluating Exposure to RF Emissions”, pg. 1
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AT&T Barrier Guidelines
Environmental, Health and Safety (EH&S) guidelines prohibit construction of RF safety barriers that extend to, or are within the 6-ft
setback from, unprotected roof edges but do not meet the OSHA fall protection requirements of 29 CFR 1910.23 and 29 CFR
1926.500 through 1926.503. The following details are intended to assist AT&T RF safety engineers and RSVs in meeting the AT&T
Mobility RF safety compliance guidelines as defined in ND-00059. Whereas, AT&T employees and contractors working within 6 ft. from
an unprotected roof edge must follow OSHA guidelines with respect to fall protection and roof line safety.11
For Clarity: Unprotected roof edge refers to a parapet less than thirty-six (36) inches in height.
11 RF Safety Barrier 6-ft Rule v3_ehscmts_EHS cmts_ws, “Installing Radio Frequency (RF) safety barriers on roofs with unprotected edges job aid” Page 1 Overview
OSC Engineering Inc. Page 15/16
AT&T Antenna Shut-Down Protocol
AT&T provides Lockout/Tagout (LOTO) procedures in Section 9.412 (9.4.1- 9.4.9) in the ND-00059. These procedures are to be followed
in the event of anyone who needs access at or in the vicinity of transmitting AT&T antennas. Contact AT&T when accessing the
rooftop near the transmitting antennas. Below is information regarding when to contact an AT&T representative.
9.4.7 Maintenance work being performed near transmitting antennas
Whenever anyone is working within close proximity to the transmitting antenna(s), the antenna sector, multiple sectors, or entire cell
site may need to be shut down to ensure compliance with the applicable FCC MPE limit. This work may include but is not limited to
structural repairs, painting or non-RF equipment services by AT&T personnel/contractors or the owner of a tower, water tank, rooftop,
or other low-centerline sites. The particular method of energy control will depend on the scope of work (e.g., duration, impact to the
antenna or transmission cabling, etc.) and potential for RF levels to exceed the FCC MPE limits for General Population/Uncontrolled
environments
9.4.8 AT&T Employees and Contractors
AT&T employees and contractors performing work on AT&T cell sites must be trained in RF awareness and must exercise control over
their exposure to ensure compliance with the FCC MPE limit for Occupational/Controlled Environments (“Occupational MPE Limit”).
The rule of staying at least 3 feet from antennas is no longer always adequate to prevent exposure above the Occupational MPE
Limit. That general rule was applied early in the development of cellular when omni-directional antennas were primarily used and
later when wide-beamwidth antennas were used. That application was then appropriate for the Occupational exposure category.
However, the current prevalence of antennas with 60- and 70- degree horizontal half-power beamwidths at urban and suburban
GSM and UMTS/HSDPA sites raises some question about the continued reliability of the 3-foot rule. Antennas with low bottom-tip
heights and total input powers around 70-80 W can produce exposure levels exceeding the Occupational MPE Limits at 4 feet, and
these levels can be augmented by emissions of co-located operators. Therefore, AT&T employees and contractors should apply the
above general work procedures and use an RF personal monitor to assess exposure levels within the work vicinity.
9.4.9 Other Incidental Workers
All other incidental workers who are not trained in RF safety are considered general public and subject to the FCC MPE limits for
General Population/Uncontrolled Environments. In such instance, the M-RFSC (primary contact) or R-RFSC (secondary contact) must
refer to the Mobility RF site survey plan to assess the potential RF exposure levels associated with the antenna system. If capable of
exceeding the FCC General Population/Uncontrolled MPE limit, then local sector/site shutdown is necessary. The FE/FT must also
follow the local shutdown procedure and use their RF personal monitor as a screening tool for verification, as necessary.
12 ND-00059_Rev_5.1 “Lockout/Tagout (LOTO) Procedures” Page 45.
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RECOMMENDATIONS
If work is being performed in the vicinity of the transmitting antennas, site shut-down procedures must be
followed. See page entitled AT&T Antenna Shut-down protocol for further information.
•AT&T Sector A
To be installed: a 21’ barrier and
a 21’ wide physical barrier with
Caution 2 sign on all
approaches to the physical
barrier
To be installed: Caution 2 sign in
front of sector
If the parapet is less than 36” in
height: Barriers must be built a
minimum of 6 feet away from
the roof edge to comply with
AT&T safety standards
•AT&T Sector B
To be installed: a 20’ barrier and
a 19’ wide physical barrier with
Caution 2 sign on all
approaches to the physical
barrier
To be installed: Caution 2 sign in
front of sector
If the parapet is less than 36” in
height: Barriers must be built a
minimum of 6 feet away from
the roof edge to comply with
AT&T safety standards
•AT&T Sector C
To be installed: a 19’ barrier and
a 31’ wide physical barrier with
Caution 2 sign on all
approaches to the physical
barrier
To be installed: Caution 2 sign in
front of sector
If the parapet is less than 36” in
height: Barriers must be built a
minimum of 6 feet away from
the roof edge to comply with
AT&T safety standards