Final EME Report (BLD-202-1675)cDtech
communications
YOUR RF SAFETY PARTNER
RADIO FREQUENCY ELECTROMAGNETIC FIELDS EXPOSURE REPORT
POST -Activation
Prepared for T-Mobile
Site Name:
TN9 Apple Rooftop
Site ID:
SF14981A
Site Type:
Rooftop
y� -
Located at:
10335 N Tantau Avenue
Cupertino, CA 95014
Latitude: 37.327453 / Longitude:-122.006598
Report Date: 4/8/2024
Report By: Christopher Stollar, P.E.
Based on FCC Rules and Regulations, T-Mobile will be compliant provided
recommendation(s) are implemented.
Page 1 / 19
TABLE OF CONTENTS
1.0 EXECUTIVE SUMMARY..................................................................................................................................3
2.0 SITE DESCRIPTION..........................................................................................................................................4
2.1 Site Map................................................................................................................................................................4
2.2 Site Photographs.................................................................................................................................................
5
3.0 ANALYSIS..............................................................................................................................................................8
3.1 Existing Conditions............................................................................................................................................8
3.2 Emission Measurements..................................................................................................................................10
4.0 CONCLUSION...................................................................................................................................................12
4.1 Results.................................................................................................................................................................12
4.2 Recommendation(s).........................................................................................................................................12
4.3 Statement of Compliance................................................................................................................................15
4.4 Engineer Certification......................................................................................................................................15
AppendixA: Background..............................................................................................................................................16
Appendix B: Measurement and/or Computer Simulation Methods.....................................................................17
AppendixC: Limitations...............................................................................................................................................17
AppendixD: Equipment Certification........................................................................................................................18
Appendix E: Sample T-Mobile RF Advisory Signs..................................................................................................19
7 Dtech
.nmunreohons 5850 Oberlin Drive, Ste. 300 ♦ San Diego, CA 92121 ♦ 858.792.0066 ♦ www.dtecbcom.com Page 2/ 19
1.0 EXECUTIVE SUMMARY
Dtech Communications, LLC ("Dtech'� has been retained by Smartlink, contractors to T-Mobile, to
determine whether its wireless communications facility complies with the Federal Communications
Commission ("FCC's Radio Frequency ("RF") Safety. This report contains an on -site, measurement analysis
of the Electromagnetic Fields ("EMF") exposure resulting from the facility. The analysis also includes
assessment of existing wireless carriers on site, where information is provided. The table below summarizes
the results at a glance:
Table 1: EMF Summary
T-Mobile
Summary
Access Type
Door
Access to antennas locked
Yes
RF Sign(s) @ access point(s)
NOTICE, GUIDELINE (Existing)
NOC (Recommended)
RF Sign(s) @ Screen Wall Doors
NOTICE, GUIDELINE (Existing)
RF Sign(s) @ antennas
CAUTION (Existing)
CAUTION Additional Recommended
Barrier(s) @ sectors
Indicative Paint Striping (Existing)
Max EMF measured level for
0.5% General Population
Facility on Ground
Max EMF measured level near
221.8% General Population
T-Mobile on Roof
44.36% Occupational)
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2.0 SITE DESCRIPTION
The wireless telecommunication facility is located on a building rooftop. The facility consists of 3 wireless
carrier(s) or operator(s): T-Mobile (9 antennas), AT&T (10 antennas) and Verizon (16 antennas). The
antennas are typically grouped into sectors pointing in different directions to achieve the desired areas of
coverage. T-Mobile's antennas are mounted behind screen walls on the main roof.
2.1 Site Map
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2.2 Site Photographs
T-Mobile-General View
T-Mobile-Screen Wall Door (South -East End)
NOT:
RW
T-Mobile-Screen
NOT:
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� J RWIOfgFM[M.Y [w
flRgh�ryq
P Z U, -
T-Mobile-Access Door
NOTICE, GUIDELINE
T-Mobile-Screen Wall Door (North-East End)
T-Mobile-Sector A
T-Mobile-Sector A
CAUTION
T-Mobile-Sector B
T-Mobile-Sector A
T-Mobile-Sector A
CAUTION
dlikk
T-Mobile-Sector B
Indicative Paint Striping, CAUTION
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T-Mobile-Sector B
T-Mobile-Sector C
T-Mobile-Sector C
Indicative Paint Striping
T-Mobile-Sector B
CAUTION
T-Mobile-Sector C
T-Mobile-Sector C
CAUTION
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communicatbns 5850 Oberlin Drive, Ste. 300 ♦ San Diego, CA 92121 ♦ 858.792.0066 ♦ www.dtecbcom.com Page 7/ 19
3.0 ANALYSIS
3.1 Existing Conditions
Figure 1: Site Diagram - Plan (bird's eye) view map of signs/ barriers/indicative markings currently existing on site.
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Figure 2: Site Diagram - Plan (bird's eye view map of signs/barriers/indicative markings currently existing on site.
Site
Roof Level
M
C ®y�
U
Roof Level
Diagram
770w
Center
Building
Penthouse
II
Roof Level
0 0
T T Mobile
Paint NJ AT&T
AT&T
r Verizon
rou
Existing
Striping
N
Grid Size =
75 ft
4
4
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communicatbns 5850 Oberlin Drive, Ste. 300 ♦ San Diego, CA 92121 ♦ 858.792.0066 ♦ www.dtecbcom.com Page 9/ 19
3.2 Emission Measurements
Field measurements were conducted at the subject site on 4/5/2024 9:00 AM by Eric Valdez, Dtech
personnel. Weather conditions can be best described as cloudy, mild breeze.
Figure 3: Plan (bird's eye) view map of results compared to FCC's General Population MPE (Maximum Permissible
Exposure) Limits. A result higher than 100% exceeds the FCC's General Population MPE Limits.
Measurement Diagram
<5% 5.8%
<5%
<5%
Roof Level
All Other
Measurements
were <5%
Roof Level
<5%
A
17.0% 56.2% 20.4% 67.6% 48.6%
Max. 10.5%
20.6% 205.6% 22.9% 221.8% 198.4%
°
11,
_
-
_
.'I
III
►11
HE
.1I
II,
,II
II,
,II
II,
,II
I
9.7 /°
<5% <5%
<5%
All Other
Measurements
were <5%
<5%
<5%
<5% <5%
18.0%
160.5% 17.3%
°
<5%
6.2% 174.2% 187.9% 24.0% 190.3% 15.9%
<5% 7.5% 44.8% 55.4% 27.6% 48.1% <5%
B
Roof Level
N FF Elevation:52.7'
Grid Size =15 ft
Additional Measurements
Ground: 0.5%
North End
South End
T T-Mobile 6
'?I AT&T 6
JdrJ Verizon 12
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Figure 4: Plan (bird's eye view map of results compared to FCCs General Population MPE (Maximum Permissible
Exposure) Limits. A result higher than 100% exceeds the FCCs General Population MPE Limits.
Center
Building
Roof Level
N FF Elevation:52.7'
Grid Size = 15 ft
Measurement Diagram
Roof Level
<5%
<5%
<5%
<5%
14.5% 10.1%
148.9%
64.3%
<5%
<5%
167.0%
<5%
50.1%
Penthouse
152.2%
62.1%
<5%
215.5%
C
45.0%
<5%
134.6%
<5%
17.4% Roof Level
<5% All Other
<5% Measurements
were <5%
<5% <5%
<5% 0
Roof Level
Additional Measurements
Ground: 0.5%
�MI
0
T T-Mobile 3
o ATV 4
T Verizon 4
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,ommunicatbns 5850 Oberlin Drive, Ste. 300 ♦ San Diego, CA 92121 ♦ 858.792.0066 ♦ www.dtecbcom.com Page 11 / 19
4.0 CONCLUSION
4.1 Results
For a typical 6-foot person standing in accessible areas on the ground, measurements for T-Mobile's site
including contributions from existing carriers resulted in exposure levels below the FCC's most stringent
General Population MPE Limits.
For a typical 6-foot person standing on the roof, the highest measured exposure level is above the FCC's
General Population MPE Limits near the T-Mobile antennas.
There is indicative paint striping and some RF advisory sign(s) already posted at path(s) to and/or near the
antennas to help establish awareness for exposure. There may be situations where workers i.e. window
washers, painters, roofers, etc., may find themselves directly in front of the antennas. Individuals entering
the site or working near/in front of antennas must receive appropriate RF safety training and be made
aware of the RF restricted areas. In addition, contact information should be made available in the event
work is required within the RF restricted areas. Alternatively, if the need occurs for any building
maintenance personnel to work directly in front of the antennas, T-Mobile should be contacted to arrange
for the power to be shut down during the work period.
4.2 Recommendation(s)
The following compliance action(s) would be sufficient to meet the FCC's RF Safety Guidelines:
1) Install additional RF advisory signs according to the Recommendation diagram.
2) Apply Antenna Shutdown procedure. Proper notification including identification of restricted areas
or RF exposure maps, antenna power -down procedures and contact information must be provided
to the building's landlord or property owner. This will help ensure that a regional point of contact or
the NOC will be contacted when someone in the public needs to perform maintenance in areas of
potential concern.
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Figure 5: Becommendation(s) Diagram -Final Compliant Configuration: North/South Building. Small sign icons are
existing on site and large (red) sign icons are additional recommended signs.
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Figure 6. Recommendation(s) Diagram - Final Compliant Configuration: Center Building. Small sign icons are existing on
site and large (red) sign icons are additional recommended signs.
)mmendation Diagram
wel H F-- -7
wel
Existing Paint
Striping
Penthouse
Roof Level
M
0
0
dP T-Mobile 3
oI AT&T 4
drI Verizon 4
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4.3 Statement of Compliance
Based on the above results, analysis and recommendation(s), it is the undersigned's professional opinion
that T-Mobile's site including contributions from existing carriers will be compliant with the FCC's RF
Safety Guidelines provided recommendations) are implemented.
4.4 Engineer Certification
This report has been prepared by or under the direction of the following Registered Professional Engineer:
Darang Tech, holding California registration number 16000. I have reviewed this report and believe it to be
both true and accurate to the best of my knowledge.
E551p�
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* EXP. '5/10/25
OCTf2l�P��y�
'CALIF
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Appendix A: Background
Dtech uses the FCC's guidelines described in detail in Office of Engineering & Technology, Bulletin No. 65
("OET-65") "Evaluating Compliance with FCC Guidelines for Human Exposure to Radiofrequency
Electromagnetic Fields". The table below summarizes the current Maximum Permissible Exposure
("MPE") safety limits classified into two groups: General population and Occupational.
Table 2: FCC MPE Limits (from OET-65)
Frequen
neral Population/
Averagi
ccupational/ �JAveragm
(Mh
controlled MPE
(mW/cm2)
L
Tim
inutes
Controlled MPE Time
(mW/cm2) minutes
1 11
1
1
11 11
Frequency11
1
Frequency 11
1 1
1 1
11
100,0 11
1
1
1
General population/uncontrolled limits apply in situations in which the general public may be exposed or
in which persons who are exposed as a consequence of their employment, and may not be 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 limits apply in situations in which persons are exposed as a consequence of their
employment, and those persons have been made fully aware of the potential for exposure and can exercise
control over their exposure. Occupational/controlled 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.
It is important to understand that the FCC guidelines specify exposure limits not emission limits. For a
transmitting facility to be out of compliance with the FCC's RF safety guidelines an area or areas where
levels exceed the MPE limits must, first of all, be in some way accessible to the public or to workers. When
accessibility to an area where excessive levels is appropriately restricted, the facility or operation can certify
that it complies with the FCC requirements.
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Appendix B: Measurement and/or Computer Simulation Methods
Spatial averaging measurement technique is used. An area between 2 and 6 feet, approximately the size of
an average human, is scanned in single passes from top to bottom in multiple planes. When possible,
measurements were made at very close proximity to the antennas and inside the main beam where most of
the energy is emitted. The spatial averaged values were recorded. A result higher than 100% exceeds the
FCC's General Population MPE Limits.
Dtech uses an industry standard power density prediction computer Modell to assess the worse -case,
cumulative EMF impact of the surrounding areas of the subject site. In addition, the analysis is performed
at 100% duty cycle -all transmitters are active at all times and transmitting at maximum power. For purposes
of a cumulative study, nearby transmitters are included where possible. The result is a surrounding area map
color -coded to percentages of the applicable FCC's MPE Limits.
Appendix C: Limitations
The conclusions in this document rendered by Dtech are based solely upon the information collected during
the site survey and/or furnished by our Client which Dtech believes is accurate and correct. Dtech,
however, has no responsibility should such Client provided information prove to be inaccurate or
incorrect. Third party specification estimates used for cumulative computer simulation purposes, where
applicable, are based on common industry practices and our best interpretation of available
information. Data, results and conclusions in this document are valid as of its date. However, as mobile
technologies continuously change, these data, results and conclusions may also be at variance with such
future changes. Dtech has no responsibility to update its survey or report to account for such future
technology changes. This document was prepared for the use of our Client only and cannot be utilized by
any third party for any purpose without Dtech's written consent. Dtech shall have no liability for any
unauthorized use of this document and any such unauthorized user shall defend, indemnify and hold Dtech
and its owners, directors, officers and employees harmless from and against any liability, claim, demand, loss
or expense (including reasonable attorney's fees) arising from such unauthorized use.
1 Roofmaster(tm)
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Appendix D: Equipment2 Certification
'[L� "� Advanced Test
Equipment Corp,
Li aials - Sales - Calibration - Service
ATEC Asset ID
IIIIIII IIIII IIIII IIIII Ill
26306
Certtllcats Number: 2024001517-Rev2
Asaet lD
26306
Manufacturer
NsAa
Model Number
NARD-EA5D91
Serial Number
D1008
DeaWptlon
300idiz-50GHz Isotropic Probe, Shaped
E-Flold, FCC
AB�Advanced Test
Equipment Corp.
Rentals • Sales - Calibration - Service
ATEC Asset ID
II IIIII IIIII IIIII IIIII III
26304
Certificate Number. 2024001516Rev1
Asset I
26304
Manufac4rrer
Nerds
Model Number
NARD-NBM-520
Serial Number
M200
Deecription
Broadband FWd Meter (W probea)
CALIBRATION CERTIFICATE
Work Order
II IIIII IIIII IIIII IIIII IIIII IIIII IIIII IIIII IIIII IIII IIIIIIII IIII III IIIIII III
2024001517
inKWCondrdon
In Tolerance
Final condnlon
In Tolerance
Canbration Date
1/302024
Due Date
1l3 =6
Temperature C'
22.90
Humidly
35.0
Procedure
Probe ATE Software 990313
Rev. Revision
CALIBRATION CERTIFICATE
Work Order
II IIIII IIIII IIIII IIIII IIIII IIIII IIIII IIIII IIIII IIII IIIIIIII IIII (IIIIIIII III
2024001516
lnft Condleon
In Tolerance
Final CondMon
In Tolerance
Calibration Date
lr3OM24
Due Date
1/302026
Temperature C'
24.08
Humidity
34.01
Procedure
2401-8700-OOA
Rev. Revision
2 The meter manufacturer specification indicates that readings below 20% have an uncertainty of ±3dB and the instrument's dynamic range is between 2.5% and
3000.0% of the FCC's public limits. Therefore, a reading below 2.5% may be interpreted at the minimum range of 2.5%.
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Appendix E: Sample T-Mobile' RF Advisory Signs
j \, NOTICE
GUIDELINES FOR WORKING IN
RAOIOFREOUENCY ENVIRONMENTS
• WI personnel should have electromagnetic energy
tE ME t awareness trai ni ng.
• Al personnel erderi no this site must be authori zed.
obey all posted signs.
. Assume all antennas are a"i e.
Belpre wvr king on antennas, notify owners and disable
appr opri ate trans miners.
• Mairdai n mi ni mu m 3 feet cl earance from al I ardennas
Ba no! slop in }rant of antennas.
• the personal RF monitors while working near
are—
♦ Never operate transmitters Without shields during
normal operation.
• Oo not operate base elation antennas in equipmerR
rcoms.
GUIDELINES Sign
IN CASE OF
EMERGENCY
CALL
1-888-662-4662
Site No:
Site Mame:
NOC Sign
• ACAUTION
Beyond this point:
Radio frequency fields beyond Radio frequency fields at this site
this point may exceed the FCC may exceed FCC rules for human
general public exposure limit. exposure.
Obey ell pesbld signs and site guideline; For your safety, obey all posted signs and
for working In radio frequency site guidelines for working in radio
environments.
frequency ernironments.
NOTICE Sign CAUTION Sign
AWARNING
Beyond this point:
Radio frequency fields at this site
exceed the FCC rules for human
exposure.
Failure to obey all posted signs and site
guidelines for vrorkin9 In radio frequency
... imnments=idd result in senous injury.
WARNING Sign
3 The above signage is for reference only. Actual signs may be updated in accordance to T-Mobile RF policy. See cover page for site specific information.
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