RF Report (BLD-2021-0507) 10101 N De AnzaCompliance Statement
Based on information provided by AT&T Mobility and predictive modeling, the Central Cupertino 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. Delineating areas that are predicted to exceed the FCC MPE limits with barriers and
RF alerting signage and restricting access to these areas to authorized personnel 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 at ground level or in adjacent buildings.
Certification
I, David H. Kiser, 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: Central Cupertino Site Structure Type: Rooftop
Address: 10101 North De Anza
Boulevard
Latitude: 37.3238333
Cupertino, CA 95014 Longitude: -122.0331111
Report Date: February 23, 2021 Project: Modification
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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:
!= !"#$
%⋅'⋅#! (mW/cm()
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
!=*180
.)*
/⋅100 ⋅1+,
2 ⋅3 ⋅ℎ (mW/cm()
where Pin is the power input to the antenna, qBW 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 maximum-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.
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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 (4) AIR5331 ANTENNAS ON NEW ANTENNA MOUNTS ON
ROOFTOP, TYP. 1 PER SECTOR (INCLUDING (1) AT NEW SECTOR E)
The antennas will be mounted on a 52-foot Rooftop with centerlines 57 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. No other antennas are known to be
operating in the vicinity of this site.
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
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7430 New Technology Way, Suite 150 Frederick, Maryland 21703 (703) 596-1022 Phone www.waterfordconsultants.com
of the antennas. For accessible areas at ground level, the maximum predicted power density level resulting
from all AT&T Mobility operations is 2.66% of the FCC General Population limits. Incident at adjacent buildings
depicted in Figure 1, the maximum predicted power density level resulting from all AT&T Mobility operations is
16.7119% of the FCC General Population limits. The proposed operation will not expose members of the
General Public to hazardous levels of RF energy at ground level or in adjacent buildings.
For accessible areas at the roof level of 10101 North De Anza Boulevard, the maximum predicted power
density level resulting from all AT&T Mobility operations is 665.078% of the FCC Occupational limits (3325.39%
of the FCC General Population limits). For areas on the roof near the antennas that are predicted to exceed
the General Population limits, barriers and RF alerting signs (Caution 2) should be posted to be visible upon
approach to provide notification of potential conditions at these areas. These recommendations are depicted
in Figure 2.1, 2.2 and 2.3. Any work activity in front of transmitting antennas should be coordinated with AT&T
Mobility.
Compliance Requirement Diagram (Alpha Sector)
Recommendations
AT&T Mobility Alpha
Sector
Caution 2 signs required
in front and behind the
sector on screen wall
AND
Caution 2 sign required
on barrier post
Materials –
6 Post,
9 Caution 2 Signs,
Roughly 22’ Chain.
Barriers Space –
4’x8’x10’
**Barriers must be
built a minimum of 6
feet away from
unprotected roof edge.
Minimum of 36” of
parapet wall
Figure 2.1: Mitigation Recommendations
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7430 New Technology Way, Suite 150 Frederick, Maryland 21703 (703) 596-1022 Phone www.waterfordconsultants.com
Compliance Requirement Diagram (Beta Sector)
Recommendations
AT&T Mobility Beta Sector
Caution 2 signs required in
front and behind the sector on
screen wall
AND
Caution 2 sign required on
barrier post
Materials –
16 Post,
13 Caution 2 Signs,
Roughly 80’ Chain.
Barriers Space –
7’x10’x8’x17’x4’x8’x11’x9’x6’
**Barriers must be built a
minimum of 6 feet away
from unprotected roof edge.
Minimum of 36” of parapet
wall
Figure 2.2: Mitigation Recommendations
Central Cupertino - Modification 02.23.2021
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7430 New Technology Way, Suite 150 Frederick, Maryland 21703 (703) 596-1022 Phone www.waterfordconsultants.com
Compliance Requirement Diagram (Gamma Sector)
Recommendations
AT&T Mobility Gamma
Sector
Caution 2 signs required
in front and behind the
sector on screen wall
AND
Caution 2 sign required
on barrier post
Materials –
8 Post,
11 Caution 2 Signs,
Roughly 39’ Chain.
Barriers Space –
18’x9’x12’
**Barriers must be built
a minimum of 6 feet
away from unprotected
roof edge. Minimum of
36” of parapet wall
Figure 2.3: Mitigation Recommendations
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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 (MHz):
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 ERICSSON SON_AIR5331_B260_TB 39000 20 0 4 2 1.2 1 0 26.89 610 1000 57
2 AT&T QUINTEL QS4658-3 02DT 700 20 0 64 4.3 40 2 0 10.25 847 1390 57
2 AT&T QUINTEL QS4658-3 02DT 2300 20 0 57 4.3 25 4 0 13.85 2427 3981 57
3 AT&T KATHREIN 742264V01 00DT 850 20 0 67.7 4.4 40 2 0 11.95 1253 2056 57
4 AT&T COMMSCOPE SBNHH-1D65A 00DT 2100 20 0 62 4.6 60 4 0 14.7 7083 11620 57
5 AT&T QUINTEL QS4658-3E 02DT 700 20 0 69 4.3 40 2 0 10.15 828 1359 57
5 AT&T QUINTEL QS4658-3E 02DT 850 20 0 65 4.3 40 2 0 11.15 1043 1710 57
5 AT&T QUINTEL QS4658-3E 02DT 1900 20 0 74 4.3 40 4 0 13.55 3623 5945 57
6 AT&T ERICSSON SON_AIR5331_B260_TB 39000 0 0 4 2 1.2 1 0 26.89 610 1000 57
7 AT&T QUINTEL QS4658-3 02DT 700 260 0 64 4.3 40 2 0 10.25 847 1390 57
7 AT&T QUINTEL QS4658-3 02DT 2300 260 0 57 4.3 25 4 0 13.85 2427 3981 57
8 AT&T KATHREIN 742264V01 00DT 850 260 0 67.7 4.4 40 2 0 11.95 1253 2056 57
9 AT&T COMMSCOPE SBNHH-1D65A 00DT 2100 260 0 62 4.6 60 4 0 14.7 7083 11620 57
10 AT&T QUINTEL QS4658-3E 02DT 700 260 0 69 4.3 40 2 0 10.15 828 1359 57
10 AT&T QUINTEL QS4658-3E 02DT 850 260 0 65 4.3 40 2 0 11.15 1043 1710 57
10 AT&T QUINTEL QS4658-3E 02DT 1900 260 0 74 4.3 40 4 0 13.55 3623 5945 57
11 AT&T QUINTEL QS4658-3 02DT 700 140 0 64 4.3 40 2 0 10.25 847 1390 57
11 AT&T QUINTEL QS4658-3 02DT 2300 140 0 57 4.3 25 4 0 13.85 2427 3981 57
12 AT&T KATHREIN 742264V01 00DT 850 140 0 67.7 4.4 40 2 0 11.95 1253 2056 57
13 AT&T COMMSCOPE SBNHH-1D65A 00DT 2100 140 0 62 4.6 60 4 0 14.7 7083 11620 57
14 AT&T QUINTEL QS4658-3E 02DT 700 140 0 69 4.3 40 2 0 10.15 828 1359 57
14 AT&T QUINTEL QS4658-3E 02DT 850 140 0 65 4.3 40 2 0 11.15 1043 1710 57
14 AT&T QUINTEL QS4658-3E 02DT 1900 140 0 74 4.3 40 4 0 13.55 3623 5945 57
15 AT&T ERICSSON SON_AIR5331_B260_TB 39000 140 0 4 2 1.2 1 0 26.89 610 1000 57
16 AT&T ERICSSON SON_AIR5331_B260_TB 39000 230 0 4 2 1.2 1 0 26.89 610 1000 57