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儉उ縉縠മ⼊渨眊ग़൚眊െ儊उⴉ㤨娠兡圉ॡॷऽ睭婆⁑॑ൡ䨊भൾ瀊ॾൎ縊ॗ縯繡浯९ൾ䤊ॾൾഊ朊漉ൾ縊⸉⸮繚䙾潗ഉ伊൷上९ൗ縊ॡൟ縊瞰ഉ《൷愊൯愊澰ഉഊ縊ൡ眊ഉഊ瘊ॗൾഊ縊ഉ㨊慎⁾ൾ爊८൯ഊഊ圊漉伊縉൷ഊ뀊ॷൡ伊ⵦ縉縉娉ഉऊ്椊७൲ഊ縊縉끠ॉൄ上繾檕›爻മ⸊ൾℊ椻怭怮ൾ猊縠⸮张氺㨮›ⴧ䤠縠縠ൟ㼊倠佒佐䕓⁄ⵔ位䥂䕌倠乁䱅ള䄊呎久䅎奔⹐传⁆㠨ഩ吊呏䱁⠠′䕐⁒䕓呃剏ഩℊന怊甠倠佒佐䕓⁄ⵔ位䥂䕌吠䅍乕呉奔㩐倭佒佐䕓⁄ⵔ位䥂䕌㈠ധ䐊䅉䥍剃坏噁⁅䥄䡓丨 佔䕗⁒佔⁐䅈ൔ䈊⁙䝐䔦൭긊⠠⥅䌠乏啄呃剏奔ⱐ椊Ⱐ縠ൾ긊⠠⥅倠♇⁅䅌呔䍉긊吠坏剅縊縠൜爊縧⁾✧縧䔨 呕䱉呉⁙佐䕌剐偏协䑅吠䴭䉏䱉ऊ✉॑उउ繾मउ尊ग़䤉ⵗൾ娊उഉ圊娠उ॑उ❕ग़圉उഉ愊उॡॷ三ൽ圊उ縉उ൭䘊ग़उ൰縊उൾ⸊⁑ൡ弊मॾൊⴊ९ॾ眉ൡ搊縠Ⰹ⸮⸮⸉ൟ縊भ⸮⸭⸮⸮縮⸭ॾ⸮⸮縉₰७縉ഉ朊⸉ ബ弊⸮⸉⸮⸮ൾ縊ॏ縉उ唉幚ॾ伉圉उൾ⸊⸮उउ漉潗उॾॾഉ뀊ॗउउධऊ縉圉उ끯उॡउ൯漊ൟ縊उ眉उൡ縊उॡরഉ上⹑उഉഊ愊उൗ縊ब眉漉उര漊उउഉ洊उउഉ漊ൟ伊उॕॾ䘉ⵆउउ娉ൕऊउॉഉऊउउ൩ऊ⠉ॖउ縺उॾउൾ縊樺瘺繜Ⱜ䥉㬠‧剐偏协䑅吠䴭䉏䱉⁅䅐䕎ൌ䄊呎久䅎奔⹐传⁆㠨ഩ吊呏䱁⠠′䕐⁒䕓呃剏ഩℊ縪ബ縊倠佒佐䕓⁄ⵔ位䥂䕌吠䅍乕呉奔ⱐ剐偏协䑅吠䴭䉏䱉⁅縲䥄ⱁ䴠䍉佒䅗䕖䐠卉ൈ⠊⥎吠坏剅吠偏䠠呁奂倠♇⠊⥅䌠乏啄呃剏奔ⱐമ⠊⥅唠䥔䥌奔倠䱏⁅䕂余䑎剐偏协䑅吠䴭䉏䱉⁅假䄊呎久䅎उഉഊ䤊繬楦Ⱐㅾ⁾繾縠椠ॾⱠ繾㩩⁾楾Ⰹഭ栊恩Ⱐ縶⁾ॾറ弊 ⹉⁉㴭弬 ⁾ൾⰊ縭氠汾䤠灾㭾䤠爉縠ഭ氊繬縧䥾爉嘠楩䥾䘠ഢ縊ⴉഭ縊ൾ縊縠Ⱐ䥉縬㭾瀠 ⹉彟䤠椠縠琠䤠椠ㄠ⁾ऱ繾楾Ⱐൾ㐊琠楌彬彾渉縠纵弭ⴴㄭ✉彫彟∭䨭剐偏协䑅㘠‧呈佗䑏䱓呁䘠久䕃剐偏协䑅吠䴭䉏䱉䔊啑偉䕍呎 䕌十⁅剁䅅剐偏协䑅㘠‧呈മ䌊䅈义䥌䭎䘠久䕃३縉उ低呒⁈䱅噅呁佉ॎ≳ॠउलഉऊⰬബ弊縉मउ䅅呓䔠䕌䅖䥔乏ഉ䴊䍉䅈䱅圠䱉⁋്䄊繦䡃呩䍅啔繦㠊㌳䴠牡敫⁴瑓敲瑥㠣㔰慓牆湡楣捳Ɐ䌠⁁㐹〱ള吊※ㄴⴵ㌸ⴹ㔹㐹⁒ㄴⴵ〹ⴴ㌸㠸睷繷汷歬牡档挬浯漉縉⁾ബ縊ൠ砊縉縠ㄠ縠湲縉⁉⁾끾洉湲✉爠⸠昉縠ൕऊൗ縊縠൯ꈊൾऊ•潾縉ൕ搊ൾऊൾ⸊ൕऊഉऊ⸮⸧ഉऊ❾ൾऊऊ瑉ഉ䐊䅒乗䈠㭙䨠⁖䡃䍅䕋⁄奂›坍畮甠楁⁴慩畡൴ㄊㄠ‱㘲传⁓〹‥佚䥎䝎′㈱ㄠ‷㠰ㄠ〰‥佚䥎䝎洉渨ഉ爊⁾൏縊ഉ爊൮瘊縉繾ൾ爊उ⁑縊啑ॏൊഊ䨊圉⁚൏縊䤠✭䱌⽾ॾൗഊ䰊ഉ縊娠ൾ圊圠映ഭഊ瘊ॉ൲ഊ縊ഉ縊✭繾湦睏圉湲锉愽⁚ൾऊॖൕ匊䕈呅㜠吱䕌䱅噅呁佉华䡓䕅⁔啎䉍剅റ
CITY OF
CUPERTINO
City of Cupertino
10300 Torre Avenue
Cupertino, CA 95014
(408) 777-3251
FAX (408) 777-3333
Community Development Department
Application: DIR-2008-37, EXC-2008-17; V-2008-01 Agenda Date: March 10, 2009
Applicant: Dayna Aguirre, Sutro Consulting
Property Owner: Pacific, Gas & Electric
Property Location: North Stelling Road at Homestead Road (Stelling Substation)
(no address number)
APPLICATION SUMMARY:
Director's Minor Modification (file no. DIR-2008-37) to allow the construction of a
personal wireless service facility, consisting of 8 panel antennas and a microwave dish
mounted on a rack affixed to an existing PG&E lattice tower and a base equipment
enclosure located beneath the lattice tower.
Height Exception (file no. EXC-2008-17) to allow 8 panel antennas to be mounted at a
height of about 95 feet and a microwave dish to be mounted at a height of about 86 feet
on a lattice tower where 55 feet is allowed.
Variance (file no. V-2008-01) to allow panel antennas of a personal wireless service
facility to be setback a minimum of 25 feet (horizontal distance) and a microwave dish
to be setback a minimum of 24 feet (horizontal distance) from a residential property line
where 50 feet is required.
RECOMMENDATION:
Staff recommends that the Planning Commission approve file nos. DIR-2008-37, EXC-
2008-17 and V-2008-01 subject to the model resolutions.
PROJECT DATA:
Existing Zoning District:
Land Use:
Project Detail
Panel Antenna Height
Microwave Antenna Height
P(CG) Planned Development- General Commercial
Intent
PG& E electrical substation
Proposed Ordinance Allowance
94 feet, 4 inches 55 feet
85 feet, 6 inches 55 feet
DIR-2008-37, EXC-2008-17, V-2008-01
March 10, 2009
Page 2
Residential Property Line Setback:
Of Closest Panel Antenna: 25 feet (horizontal distance) 50 feet
Of Microwave Antenna: 24 feet (horizontal distance) 50 feet
Environmental Review: Categorical Exception, CEQA Section 15301: Existing Facilities
BACKGROUND:
The applicant, Dayna Aguirre of Sutro Consulting, is representing T -Mobile in its
application for a personal wireless service facility proposed in a Pacific, Gas & Electric
electrical substation located at North Stelling Road and Homestead Road. The facility
consists of 8 panel antennas and a microwave dish antenna mounted on a rack affixed
to the top of an existing lattice tower and a base equipment enclosure located between
the tower legs (Exhibit A). The tower is located on the southwest corner of the
substation property and will be accessed via an existing church driveway along the
southern property line.
The project site is surrounded by a church, its parking lot and recreational facilities to
the south, east and north; and by an office building to the north and 2 -story apartment
buildings to the west. All of the land uses are in Cupertino, except for the apartments
which are located in the City of Sunnyvale.
DIR-2008-37, EXC-2008-17, V-2008-01
March 10, 2009
Page 3
Because of the location of the lattice tower and the proposed location of the antennas on
that tower, the applicant is proposing a height exception and a setback variance for the
antennas. The project is subject to the 1996 -adopted wireless communications facilities
ordinance. The revised ordinance, previously reviewed by the Planning Commission,
will not go into effect until March 19, 2009.
DISCUSSION:
Communications Coverage: The applicant has supplied coverage maps depicting
existing conditions and proposed coverage (Exhibit B). The maps show existing T -
Mobile antenna sites and their coverages in southwest Sunnyvale and northwest
Cupertino. There is poor to fair coverage along the Homestead Road, Highway 280 and
North Stelling/Hollenbeck Avenue corridors. The proposed T -Mobile facility, larger
than most facilities in the surrounding area, will fill in the gap and provide "good" in -
building T -Mobile coverage to southwest Sunnyvale and northwest Cupertino, which
includes the Homestead Road corridor from Highway 85 to North De Anza Blvd.,
Homestead High School, the Garden Gate neighborhood, and portions of the North De
Anza area.
Radio Frequency Radiation (RFR) Assessment: The Federal Communications
Commission (FCC) has established exposure standards for personal wireless service
technology for the general public and also for occupational workers. Federal
telecommunications law prohibits a city from denying a development application for a
personal wireless service facility based on health concerns if the RFR emissions meet the
FCC safety standards.
As the proposed personal wireless service facility is located next to some apartments,
the applicant has submitted a RFR assessment (Exhibit C). According to the report
submitted by Hammett & Edison, Inc. Consulting Engineers, based on the type of radio
equipment, the height and geometry of the antennas and assuming a worst case
maximum power output, ground level maximum ambient RF exposure is calculated to
be 0.085% of the maximum allowable public exposure limit (i.e. 1.00 microwatt per
squared centimeter). The calculated exposure level at the second floor level of the
apartment buildings is 0.11 % of the maximum allowable public exposure limit.
Therefore, the estimated RF emissions meet the FCC RF exposure safety standards.
Noise Anal The base equipment proposed at the foot of the tower may generate
significant noise that would impact adjacent residential areas. The Cupertino noise
standards are applicable, but the noise levels were also checked against Sunnyvale's
standards. The applicant has submitted an acoustical report, evaluating estimated noise
levels against Cupertino and Sunnyvale noise standards (Exhibit D). The noise
standards are as follows:
3
DIR-2008-37, EXC-2008-17, V-2008-01
March 10, 2009
Page 4
City
Time Period
Allowable Noise Level at
Commercial/Residential Property Line
Cupertino
Daytime
65 dBA
"
Nighttime
55 dBA
Sunnyvale
Daytime
60 dBA
"
Nighttime
50 dBA
The base transceiver stations generate some noise. No air conditioning units or back-up
power generators are proposed. Noise levels dissipate with distance from the source.
The report author has calculated the noise levels to the closest Cupertino and Sunnyvale
residential property boundaries.
Residential Noise Receptor
Estimated Noise Level
Cupertino (Las Palmas Development -
under construction
23.7 dBA
Sunnyvale Noranda Drive Apartments)
43.9 dBA
The noise consultant concludes that noise generation from the project will be below
noise ordinance standards for both cities.
Height Exception: To minimize the number of new antenna structures, the applicant
seeks opportunities to locate wireless communication antennas on existing buildings,
utility poles or existing wireless structures when possible. The existing PG& E lattice
tower fits this criteria. Because of the number of conductors on this tower and T -
Mobile's coverage objectives, PG& E is requiring a short extension of the tower height
to provide the necessary clearance between the antennas and conductors. About a 7 -
foot extension is proposed for the 87.6 -foot tall, existing lattice tower, which represents
an 8% increase in tower height. The antennas would be sited at a height of 94 feet, 4
inches and 85 feet, 6 inches, where 55 feet is the maximum without a height exception.
Two photosimulations of the antenna rack on top of the tower is depicted in Exhibit E.
Similar antenna racks on lattice towers have been approved by the City in two
locations:
1) Monta Vista electrical substation, and
2) Cupertino Loc-n-Stor (not built).
Tower leg -mounted antennas were considered but the maximum height of 41 feet was
inadequate to provide desired coverage without resorting to the development of two
additional personal wireless service facilities in the area. In addition, PG& E workers
do frequent above ground maintenance at the substation, which would cause longer
0
DIR-2008-37, EXC-2008-17, V-2008-01
March 10, 2009
Page 5
than average exposures to RFR emissions if the antennas were sited at a lower height.
T -Mobile desires an operational situation where the antennas are high enough so the
personal wireless facility does not have to be turned off every time PG&E does routine
maintenance at the substation.
Setback Variance: The PG&E lattice tower is already setback 20+ feet from the abutting
residential property line. Siting T -mobile antennas on the tower (a 24 and 25 -foot
setback from residential) requires a setback variance from the current ordinance
requirement of 50 feet (horizontal distance).
The reason for the setback is to minimize the visual intrusiveness an antenna
mast/ tower may have on surrounding residential properties. The visual impact of the
lattice tower remains, regardless of whether the antennas are approved or not. The T -
Mobile facility makes a minor contribution to the visual appearance of the lattice tower,
increasing its height by only 8%. The cabling running between the antennas and the
base equipment station will be painted the same color as the tower to minimize its
appearance.
The new wireless communications facilities ordinance, effective March 19, 2009 will
allow antennas on existing utility poles and towers, regardless of setback from a
residential property line as long as the FCC RFR exposure standards are being met.
Staff is supportive of the variance request.
Noticing and Public Comments:
Staff conducted a 1,000 -foot radius noticing of property owners and submitted plans
and documents to the designated Technology, Information and Communications
Commission (TICC) members: Peter Friedland and Avinash Gadre, and the City of
Sunnyvale. Their comments are attached as Exhibit F.
Both TICC Commissioners felt the height exception was acceptable given the reduced
setback of the antennas from the residential property line. At the higher height the
antennas would be vertically separated about 75 feet away from the roof of the closest
apartment building.
Sunnyvale planning staff also commented on the proposal. The staff had two concerns:
1) potential noise from the base equipment, which has been addressed, and the lack of
discussion about alternative lattice towers on the substation property. The Sunnyvale
letter mentions three other towers; there are only two others pictured in the Existing
Conditions photos (Exhibit E). Both are shorter (about 67 and 60 feet in height) and
much more slender than the project tower. The 67 -foot tower is closer to the residences
and is excluded for discussion purposes. The other tower is about 245 feet away from
the Sunnyvale residences and closer to Stelling Road. The applicant stated that these
5
DIR-2008-37, EXC-2008-17, V-2008-01
March 10, 2009
Page 6
slender towers are not strong enough to accommodate the extra weight (and wind load)
of the proposed antenna rack.
Submitted by: Colin Jung, Senior Planner
Approved by: Steve Piasecki, Community Development Direct
Enclosures:
Model Resolutions for DIR-2008-37, EXC-2008-17; V-2008-01
Exhibit A: Sutro Consulting Project Description
Exhibit B: T -Mobile Communications Coverage Maps (Existing & Proposed)
Exhibit C: RF Emissions Assessment by Hammett & Edison, Inc. dated 12/19/08
Exhibit D: Noise Assessment by Hammett & Edison, Inc. dated 12/29/08
Exhibit E: Two photosimulations of proposed T -Mobile personal wireless service
facility
Exhibit F: Public comments from TICC Commissioners and City of Sunnyvale
Plan Set
G: \ Planning\ PDREPORT\ pcEXCreports\ 2008excrepor ts\ EXC-2008-17. doc
on
Traci Caton
From: on behalf of City of Cupertino Planning Dept.
To: Colin Jung
Cc: Gary Chao
Subject: FW: Public hearing 3/10 regarding cell phone tower, application no. DIR-2008-37, etc
FYI — we will include this communication as a desk item this evening.
From: David Arnold & Maureen McCormick [mailto:dbamm@earthlink.net]
Sent: Tuesday, March 10, 2009 9:14 AM
To: City of Cupertino Planning Dept.
Subject: Re: Public hearing 3/10 regarding cell phone tower, application no. DIR-2008-37, etc
Hi Planning Department,
I have several questions regarding the proposal to add a cell phone tower to the location described in the notice
sent to local residents. I hope that these concerns will be addressed at the public hearing this evening.
Height: Will the overall height of the existing lattice tower be increased? If yes I would strongly
encourage the council to reject the proposal. The current tower height is already the highest structure
around, increasing it would be an eyesore, and would set a precedent for other applications.
Safety to residents: Presumably the existing setback restrictions are based on an assessment of health
risks associated with living near a radio frequency source. What evidence, if any, has been presented
that the proposed setbacks take the safety of local residents into account? A variance here will also set a
precedent.
Finally, why is the additional tower/station needed? My cell signal in the area around the proposed
station is fine.
Thank you for your consideration,
David Arnold
1685 New Brunswick Ave
Sunnyvale
CITY OF
CUPERTINO
February 11, 2009
Ms. Dayna Aguirre
Sutro Consulting
4166 Clarinbridge Circle
Dublin, CA 94568
Community Development Department
10300 Torre Avenue
Cupertino, CA 95014
Telephone (408) 777-3308
Fax (408 777-3333
Planning Division
RE: File Nos. DIR-2008-37, EXC-2008-17, V-2008-01: Director's Minor
Modification, Height Exception and Variance to the Setback to locate a personal
wireless service facility with 8 panel antennas on top of a PG& E lattice tower
located at an existing power substation in the southwest quadrant of Homestead
and North Stelling Roads
Dear Dayna:
I have formally reviewed your applications and have no additional project
comments. I have referred the plans to the City of Sunnyvale whose jurisdiction
borders the property, and expect to have its comments, if any, by end of next
week.
Your Planning Commission hearing has been scheduled as follows:
Tuesday, March 10, 2009, 6:45 p.m.
Cupertino Community Hall
10350 Torre Avenue
Cupertino, CA
Contact me at 408-777-3257 if you have any questions.
Sincer ,
Colin Ju g
Senior P nner
sutro consulting
4166 Clarinbridge Circle • Dublin, CA 94568 • www.sutr000nsulfirig.com
44041 : PG&E Stelling Substation
Address: N. Stelling Road @ Homestead Road, Cupertino, CA 94087
Zone: BQ (Quasi -public building)
APN: 326-07-035
Project Description
T -mobile is proposing to construct, operate and maintain a wireless telecommunications facility
on an existing PG&E lattice tower within a substation. The substation is located at the
intersection of North Stelling Road and Homestead Road. The proposed facility will consist of
four (4) sectors, with two (2) antennas per sector, totaling eight (8) antennas. The proposed
antennas will be mounted on a new PG&E seven foot (7') extension at the top of the existing
lattice tower. The existing tower stands eighty-seven feet, seven and one-fourth inches (87'-7
1/4") tall in height. The proposed lattice extension and antennas will stand ninety-four feet,
three and one-half inches (94'-3 'h"). T -mobile also proposed to locate a two feet (2') in
diameter microwave dish to be located just below the proposed antennas. The antennas,
microwave dish, and all cables will be painted/ordered grey to match the color of the lattice
tower. The Base Transceiver Station (BTS) equipment cabinets will be placed directly under the
lattice tower on a concrete slab, within a new wood slat fence. In addition, a new chain link
fence will be place outside of the tower.
The location and configuration of the proposed antennas have been selected to achieve the
functional requirements for T -mobile Radio Frequency Engineers. As referenced in the RF
Coverage Maps, T -Mobile subscribers experience minimal or loss of coverage along
Homestead Road from state route 85 heading east towards North De Anza Boulevard. The
development of this portion of the network will allow its customers seamless access to a
nationwide network of services, whether driving, working or residing in this particular area.
Much like the other carriers and as a mandate by the FCC, T -mobile seeks to provide an
additional communication infrastructure to the wireless community. This location was also
selected because of its position relative to existing sites, providing favorable site geometry for
federally mandated E911 location accuracy requirements. Since 40 percent of 911 calls are
from mobile phones, effective site geometry within the overall network is needed to achieve
accurate location information of mobile users, through triangulation with active wireless facilities.
Safety and Compliance
The proposed facility will not be detrimental to the character of development, as it will be
unstaffed, having no impact on parking or traffic. After construction of the facility, the site will be
serviced once a month, during a routine scheduled maintenance window by a service
technician. Furthermore, the facility will generate no noise, odor, smoke or any other adverse
impacts to adjacent land uses. T -Mobile technology does not interfere with any other forms of
private or public communications systems. In addition, the proposed wireless
telecommunications facility will operate in full compliance with all local, state and federal
regulations including the Telecommunications Act of 1996.
T -Mobile Company Information
Based in Bellevue, Washington, the U.S. operations of T -Mobile International AG & Co. K.G.,
consists of T -Mobile USA, Inc. (formerly VoiceStream Wireless) and Powertel, Inc. (together "T -
Page 1 of 2
sutro consulting_
4166 Clarinbridge Circle • Dublin, CA 94568 • www.sutrooDnsutting.com
Mobile"). A cornerstone of T -Mobile's strong consumer appeal has been its Get More@
business strategy to provide customers with the best overall value in their wireless service so
they can enjoy the benefits of mobile communications to Get More From Life®. T -Mobile has
more than 24,000 employees across the country dedicated to delivering on its Get More@
promise to provide customers with more minutes, more features and more service. The T -
Mobile global brand name made its debut in the United States in July 2002, choosing California
and Nevada as the first markets in the country to launch its wireless voice and data services.
Here in the Bay Area, T -Mobile has purchased and taken control of the former PacBell Wireless/
Cingular System on January 5, 2005. T -Mobile operates an all-digital, national wireless network
based exclusively on GSM technology. T -Mobile holds a license in the California Market as
follows: 1950.2-1964.8, 1965.2-1969.8 MHz and 1870.2-1884.8, 1885.2-1889.8 MHz.
T -Mobile Site Selection/Co-location/Height Justification
In an effort to minimize the number of new facilities in an area, T -Mobile is always looking for
opportunities to co -locate on existing buildings, utility poles or existing wireless structures. For
this particular site, T -Mobile identified a PG&E lattice tower, which currently has no carriers.
Unfortunately, the tower has a series of conductors which requires PG&E to extend the tower in
order to have the necessary clearance between antennas and conductors. The City of
Cupertino Wireless Communications Facilities Ordinance states that non -building mounted
facilities have a height limit of fifty-five feet (55). Although this proposal will not be located on a
building, it will be located on an existing (87'-7 Y4") structure. The PG&E tower is a permanent
existing structure that has proven to be a good alternative for antenna placement throughout
multiple cities in lieu of new free-standing facilities. T -mobile is requesting to extend the tower
slightly strictly for safety and interference reasons. PG&E could not allow T -mobile to locate on
their tower without the (approximately 7') extension.
Since their introduction, wireless telecommunications systems have proven to be an invaluable
communications tool in the event of emergencies (traffic accidents, fires, etc.) and natural
disasters (earthquakes, floods, etc.) where normal land line communications are often
disrupted, overlooked, or inaccessible during and after an even has occurred. This service and
similar technology are utilized by numerous governmental and quasi -governmental agencies
that provide emergency service. Wireless telecommunications systems, including cellular
telephones, have also proven to be invaluable tools in business communications and everyday
personal use. In this sense, wireless telecommunications system networks are desirable in the
interest of public convenience, health, safety and welfare, and thus are proper in relation to the
development community.
Unlike other land uses, which can be spatially determined through the General Plan, the
location of wireless telecommunication facilities is based on technical requirements which
include service area, geographical elevations, alignment with surrounding sites and customer
demand components. Placement within the urban geography is dependent on these
requirements. Consequently, wireless telecommunication facilities have been located adjacent
to and within all major land use categories including residential, commercial, industrial, open
space, etc. proving to be compatible in all locations.
Page 2 of 2
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T -Mobile • Proposed Base Station (Site No. SF44041)
Noranda Drive and Homestead Avenue • �, California
cu Pix-t�r10
Statement of Hammett & Edison, Inc., Consulting Engineers
The firm of Hammett & Edison, Inc., Consulting Engineers, has been retained on behalf of T Mobile,
a personal wireless telecommunications carrier, to evaluate the base station (Site No. SF44041)
proposed to be located at Noranda Drive and Homestead Avenue in Sunnyvale, California, for
compliance with appropriate guidelines limiting human exposure to radio frequency ("RF")
electromagnetic fields.
Prevailing Exposure Standards
The U.S. Congress requires that the Federal Communications Commission ("FCC") evaluate its
actions for possible significant impact on the environment. In Docket 93-62, effective October 15,
1997, the FCC adopted the human exposure limits for field strength and power density recommended
in Report No. 86, "Biological Effects and Exposure Criteria for Radiofrequency Electromagnetic
Fields," published in 1986 by the Congressionally chartered National Council on Radiation Protection
and Measurements ("NCRP"). Separate limits apply for occupational and public exposure conditions,
with the latter limits generally five times more restrictive. The more recent standard, developed by the
Institute of Electrical and Electronics Engineers and approved as American National Standard
ANSI/IEEE C95.1-2006, "Safety Levels with Respect to Human Exposure to Radio Frequency
Electromagnetic Fields, 3 kHz to 300 GHz," includes similar exposure limits. A summary of the
FCC's exposure limits is shown in Figure 1. These limits apply for continuous exposures and are
intended to provide a prudent margin of safety for all persons, regardless of age, gender, size, or
health.
The most restrictive FCC limit for exposures of unlimited duration to radio frequency energy for
several personal wireless services are as follows:
Personal Wireless Service
Approx. Frequency
Occupational Limit
Public Limit
Broadband Radio (`BRS")
2,600 MHz
5.00 mW/cm2
1.00 mW/cm2
Advanced Wireless ("AWS")
2,100
5.00
1.00
Personal Communication ("PCS")
1,950
5.00
1.00
Cellular Telephone
870
2.90
0.58
Specialized Mobile Radio ("SMR")
855
2.85
0.57
Long Term Evolution ("LTE")
700
2.15
0.43
[most restrictive frequency range]
30-300
1.00
0.20
General Facility Requirements
Base stations typically consist of two distinct parts: the electronic transceivers (also called "radios" or
"channels") that are connected to the traditional wired telephone lines, and the passive antennas that
send the wireless signals created by the radios out to be received by individual subscriber units. The
E ON HAMMETT & EDISON, INC.
CONSULTING ENGINEERS TM44041596
SAN FRANCNM Pagel of 3
T -Mobile • Proposed Base Station (Site No. SF44041)
Noranda Drive and Homestead Avenue • Sunnyvale, California
transceivers are often located at ground level and are connected to the antennas by coaxial cables
about 1 inch thick. Because of the short wavelength of the frequencies assigned by the FCC for
wireless services, the antennas require line -of -sight paths for their signals to propagate well and so are
installed at some height above ground. The antennas are designed to concentrate their energy toward
the horizon, with very little energy wasted toward the sky or the ground. Along with the low power of
such facilities, this means that it is generally not possible for exposure conditions to approach the
maximum permissible exposure limits without being physically very near the antennas.
Computer Modeling Method
The FCC provides direction for determining compliance in its Office of Engineering and Technology
Bulletin No. 65, "Evaluating Compliance with FCC -Specified Guidelines for Human Exposure to
Radio Frequency Radiation," dated August 1997. Figure 2 attached describes the calculation
methodologies, reflecting the facts that a directional antenna's radiation pattern is not fully formed at
locations very close by (the "near -field" effect) and that at greater distances the power level from an
energy source decreases with the square of the distance from it (the "inverse square law"). The
conservative nature of this method for evaluating exposure conditions has been verified by numerous
field tests.
Site and Facility Description
Based upon information provided by T Mobile, including drawings by Michael Wilk Architecture,
dated December 17, 2008, it is proposed to mount eight RFS Model directional panel PCS antennas on
a 7 -foot extension to be added above an existing PG&E lattice tower located on the grounds of the
substation near the intersection of Noranda Drive and Homestead Avenue in Sunnyvale. The antennas
would be mounted with 3° downtilt at an effective height of about 92 feet above ground and would be
oriented in pairs toward 40°T, 140°T, 210°T, and 310°T, to provide service in all directions. The
maximum effective radiated power in any direction would be 3,000 watts, representing simultaneous
operation at 2,000 and 1,000 watts for PCS and AWS service, respectively. Also proposed to be
mounted lower on the same tower is a 2 -foot microwave "dish" antenna, for interconnection of this
site with others in the T Mobile network. There are reported no other wireless telecommunications
base stations located nearby.
Study Results
For a person anywhere at ground, the maximum ambient RF exposure level due to the proposed
T -Mobile operation is calculated to be 0.00085 mW/cm2, which is 0.085% of the applicable public
exposure limit. The maximum calculated level at the second -floor elevation of any nearby building
would be 0.11% of the public exposure limit. It should be noted that these results include several
HAmmm & EDISON, INC.
CONSULTNG ENGU-MFRS TM44041596
HESAN FRMCr.M Page 2 of 3
T -Mobile - Proposed Base Station (Site No. SF44041)
Noranda Drive and Homestead Avenue - Sunnyvale, California
"worst-case" assumptions and therefore are expected to overstate actual power density levels. The
microwave antenna would be in point-to-point service and is so directional that it makes no significant
contribution to RF exposure conditions at ground level.
No Recommended Mitigation Measures
Since they are to be mounted on a PG&E tower, the T Mobile antennas would not be accessible to the
general public, and so no mitigation measures are necessary to comply with the FCC public exposure
guidelines. It is presumed that PG&E already takes adequate precautions to ensure that there is no
unauthorized access to its tower. To prevent exposures in excess of the occupational limit by
authorized PG&E workers, it is expected that they will adhere to appropriate safety protocols adopted
by that company.
Conclusion
Based on the information and analysis above, it is the undersigned's professional opinion that the base
station proposed by T Mobile at Noranda Drive and Homestead Avenue in Sunnyvale, California, will
comply with the prevailing standards for limiting public exposure to radio frequency energy and,
therefore, will not for this reason cause a significant impact on the environment. The highest
calculated level in publicly accessible areas is much less than the prevailing standards allow for
exposures of unlimited duration. This finding is consistent with measurements of actual exposure
conditions taken at other operating base stations.
Authorship
The undersigned author of this statement is a qualified Professional Engineer, holding California
Registration Nos. E-13026 and M-20676, which expire on June 30, 2009. This work has been carried
out by him or under his direction, and all statements are true and correct of his own knowledge except,
where noted, when data has been supplied by others, which data he believes to be correct.
December 19, 2008
IN 100r,1111m HAmmETT & EDISON, INC. TM44041596
CONSULTING ENGINEERS
SAN FRANCLSCO Page 3 of 3
FCC Radio Frequency Protection Guide
The U.S. Congress required (1996 Telecom Act) the Federal Communications Commission ("FCC")
to adopt a nationwide human exposure standard to ensure that its licensees do not, cumulatively, have
a significant impact on the environment. The FCC adopted the limits from Report No. 86, `Biological
Effects and Exposure Criteria for Radiofrequency Electromagnetic Fields," published in 1986 by the
Congressionally chartered National Council on Radiation Protection and Measurements ("NCR -P").
Separate limits apply for occupational and public exposure conditions, with the latter limits generally
five times more restrictive. The more recent standard, developed by the Institute of Electrical and
Electronics Engineers and approved as American National Standard ANSI/IEEE C95.1-2006, "Safety
Levels with Respect to Human Exposure to Radio Frequency Electromagnetic Fields, 3 kHz to
300 GHz," includes similar limits. These limits apply for continuous exposures from all sources and
are intended to provide a prudent margin of safety for all persons, regardless of age, gender, size, or
health.
As shown in the table and chart below, separate limits apply for occupational and public exposure
conditions, with the latter limits (in italics and/or dashed) up to five times more restrictive:
Frequena—
Applicable
Range
(MHz)
0.3— 1.34
1.34— 3.0
3.0— 30
30— 300
300— 1,500
1,500— 100,000
1000
100
3 10
a° A E
.. 0.1
Electromatmetic Fields (f is freauencv of emission in MHz
Electric
Magnetic
Equivalent Far -Field
Field Strength
Field Strength
Power Density
(V/m)
(A/m)
(mW/cm2)
614 614
1.63 1.63
100 100
614 823.8/f
1.63 2.19/f
100 180/1
1842/ f 823.8/f
4.89/ f 2.19/f
900/ 1 18011
61.4 27.5
0.163 0.0729
1.0 0.2
3.54ff 1. 59rf
4-f/106 ff1238
f/300 f/1500
137 61.4
0.364 0.163
5.0 1.0
Occupational Exposure
PCS
FM
� Cell
Public Exposure
0.1 1 10 100 103 101 105
Frequency (MHz)
Higher levels are allowed for short periods of time, such that total exposure levels averaged over six or
thirty minutes, for occupational or public settings, respectively, do not exceed the limits, and higher
levels also are allowed for exposures to small areas, such that the spatially averaged levels do not
exceed the limits. However, neither of these allowances is incorporated in the conservative calculation
formulas in the FCC Office of Engineering and Technology Bulletin No. 65 (August 1997) for
projecting field levels. Hammett & Edison has built those formulas into a proprietary program that
calculates, at each location on an arbitrary rectangular grid, the total expected power density from any
number of individual radio sources. The program allows for the description of buildings and uneven
terrain, if required to obtain more accurate projections.
HEHAmmETT & EDISON, INC.
CONSULTING ENGINEERS FCC Guidelines
SAN FRANCISW Figure I
RFR.CALCTM Calculation Methodology
Assessment by Calculation of Compliance with FCC Exposure Guidelines
The U.S. Congress required (1996 Telecom Act) the Federal Communications Commission ("FCC") to
adopt a nationwide human exposure standard to ensure that its licensees do not, cumulatively, have a
significant impact on the environment. The maximum permissible exposure limits adopted by the FCC
(see Figure 1) apply for continuous exposures from all sources and are intended to provide a prudent
margin of safety for all persons, regardless of age, gender, size, or health. Higher levels are allowed for
short periods of time, such that total exposure levels averaged over six or thirty minutes, for
occupational or public settings, respectively, do not exceed the limits.
Near Field.
Prediction methods have been developed for the near field zone of panel (directional) and whip
(omnidirectional) antennas, typical at wireless telecommunications base stations, as well as dish
(aperture) antennas, typically used for microwave links. The antenna patterns are not fully formed in
the near field at these antennas, and the FCC Office of Engineering and Technology Bulletin No. 65
(August 1997) gives suitable formulas for calculating power density within such zones.
For a panel or whip antenna, power density S = 180 x 0.1 x P1e, .� x D x h ' m mW /�2 '
8
sw
0.1x16x11xP1e,
and for an aperture antenna, maximum power density Smm = Tc x hZ , in mW/cm2,
where @BW = half -power beamwidth of the antenna, in degrees, and
Pnet = net power input to the antenna, in watts,
D = distance from antenna, in meters,
h = aperture height of the antenna, in meters, and
77 = aperture efficiency (unitless, typically 0.5-0.8).
The factor of 0.1 in the numerators converts to the desired units of power density.
Far Field.
OET 65 gives this formula for calculating power density in the far field of an individual RF source:
power density S = 2.56 x 1.64 x 100 x RFF2 x ERP in mW/cm2
4x,�xD2 '
where ERP =' total ERP (all polarizations), in kilowatts,
RFF = relative field factor at the direction to the actual point of calculation, and
D = distance from the center of radiation to the point of calculation, in meters.
The factor of 2.56 accounts for the increase in power density due to ground reflection, assuming a
reflection coefficient of 1.6 (1.6 x 1.6 = 2.56). The factor of 1.64 is the gain of a half -wave dipole
relative to an isotropic radiator. The factor of 100 in the numerator converts to the desired units of
power density. This formula has been built into a proprietary program that calculates, at each location
on an arbitrary rectangular grid, the total expected power density from any number of individual
radiation sources. The program also allows for the description of uneven terrain in the vicinity, to
obtain more accurate projections.
nEHAmmm & EDISON, INC.
CONSULTING INGINEERS Methodology
WSAN FRANCISCO Figure 2
Exhibit D
T -Mobile - Proposed Base Station (Site No. SF44041)
Homestead Road • Cupertino, California
Statement of Hammett & Edison, Inc., Consulting Engineers
The firm of Hammett & Edison, Inc., Consulting Engineers, has been retained on behalf of T -Mobile, a
personal wireless telecommunications carrier, to evaluate the base station (Site No. SF44041) proposed
to be located at the PG&E substation located off Homestead Road in Cupertino, California, near North
Stelling Road, for compliance with appropriate guidelines limiting noise emission levels.
Prevailing Standards
Noise standards from two different jurisdictions are used for this evaluation: Cupertino, since the site
is located in that city, and Sunnyvale, since there adjoining parcels in that city, as shown in Figure 2
attached. The City of Cupertino sets forth limits on sound levels in Chapter 10.48.040 "Daytime and
Nighttime Maximum Noise Levels" of its municipal code, as follows for the indicated zones:
Zone Time Period
Noise Limit
Residential "Day" 7 a.m. to 10 p.m.
60 dBA
"Night" 10 p.m. to 7 a.m.
50 dBA
Non-residential "Day" 7 a.m. to 10 p.m.
65 dBA
"Night" 10 p.m. to 7 a.m.
55 dBA
The City of Sunnyvale establishes limits on noise in Chapter 19.42.030 "Noise or Sound Level' of its
municipal code, which says in pertinent part:
Operational noise shall not exceed 75 dBA at any point on the property line of the premises upon
which the noise or sound is generated or produced; provided, however, that the noise or sound level
shall not exceed 50 dBA during nighttime or 60 dBA during daytime hours at any point on adjacent
residentially zoned property.
Figure 1 attached describes the calculation methodology used to determine applicable noise levels for
evaluation against the prevailing standard.
General Facility Requirements
Wireless telecommunications facilities ("cell sites") typically consist of two distinct parts: the
electronic base transceiver stations ("BTS" or "cabinets") that are connected to traditional wired
telephone lines, and the antennas that send wireless signals created by the BTS out to be received by
individual subscriber units. The BTS are often located outdoors at ground level and are connected to
the antennas by coaxial cables about 1 inch thick. The BTS typically require environmental units to
cool the electronics inside. Such cooling is often integrated into the BTS, although external air
conditioning ("AC") may be installed, especially when the BTS are housed within a larger enclosure.
Most cell sites have back-up battery power available, to run the facility for some number of hours in
the event of a power outage. Many sites have back-up power generators installed, to run the facility
during an extended power outage.
KEHAmmETT & EDISON, INC. TM44041596
CONSULTING ENGINEERS
SANFRANCIsco Page 1 of 2
T -Mobile - Proposed Base Station (Site No. SF44041)
Homestead Road - Cupertino, California
Site Description
Based upon information provided by T -Mobile, including drawings by Michael Wilk Architecture,
dated December 17, 2008, that carrier proposes to install four RBS Model 2106 radio cabinets in pairs
facing each other within a wood fence enclosure to be built under an existing lattice tower sited near the
southwest corner of the PG&E substation located at the end of a driveway off Homestead Avenue in
Cupertino and behind residential buildings on Noranda Drive in Sunnyvale. T -Mobile also proposes
install directional panel PCS antennas on a 7 -foot extension to be added above that tower, but this
portion of the base station facility does not generate acoustic noise. No stand-by power generator is
proposed for installation at this site.
Study Results
The manufacturer of the cabinets reports that maximum acoustic noise levels are 62, 59, 53, and
58 dBA, measured at 1 meter to front, right, rear, and left of the units, respectively. Based on this
data, the maximum sound pressure at the nearest property line, a non-residential parcel less than
10 feet to the south, is 52.6 dBA; this is less than the Cupertino nighttime limit of 55 dBA applicable
at that location. At the nearest residential property in Cupertino, some 390 feet to the southeast, the
maximum sound pressure level is 23.7 dBA, well below the Cupertino nighttime limit of 50 dBA at
that location. Sunnyvale would apply a limit of 75 dBA limit at the property line of the site itself,
were it in that jurisdiction, and the proposed installation meets that limit. Along the property line to
the west, at the border with Sunnyvale, the maximum sound pressure level is 43.9 dBA; this is less
than the Sunnyvale residential nighttime limit of 50 dBA.
Summary
Based on the information and analysis above, it is the undersigned's professional opinion that the
T -Mobile base station proposed to be located off Homestead Avenue in Cupertino behind Noranda
Drive in Sunnyvale will comply with the standards of those cities limiting noise levels.
Authorship
The undersigned author of this statement is a qualified Professional Engineer, holding California
Registration Nos. E-13026 and M-20676, which expire on June 30, 2009. This work has been carried
out under his direction, and all statements are true and correct of his own knowledge except, where
noted, when data has been supp
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TM44041596
Page 2 of 2
Noise Level Calculation Methodology
Most municipalities and other agencies specify noise limits in units of dBA, which is intended to
mimic the reduced receptivity of the human ear to Sound Pressure ("LP") at particularly low or high
frequencies. This frequency -sensitive filter shape, shown
in the graph to the right as defined in the International
Electrotechnical Commission Standard No. 179, the
American National Standards Institute Standard No. 5.1,
and various other standards, is also incorporated into most
calibrated field test equipment for measuring noise levels.
In analyzing situations where the frequency composition of
the emitted noise is not known, the A filter can be
disregarded, and it is seen that the results should be
conservative.
d9
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60
50
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10
0
-10
-20
-30
-40
-50'
-60
-70
-80
10
100 1000 10000
Frequency (Hz)
Manufacturers of many types of equipment, such as air
conditioners, generators, and telecommunications devices,
often test their products in various configurations to
determine the acoustical emissions at certain distances. This
data, often presented as shown in the typical chart to the left,
can be used to determine the sound pressure level at any
particular distance, such as at a nearby building or property
line. The sound pressure drops as the square of the increase in distance, according to the formula:
where LP is the sound pressure level at distance Dp and LK
LP = LK + 201og(DK/DP
is the known sound pressure level at distance DK.
),
Individual sound pressure levels at a particular point from several different noise sources cannot be
combined directly in units of dBA. Rather, the units need to be converted to scalar sound intensity
units in order to be added together, then converted back to decibel units, according to the formula:
LT = 10 log (10L1/10 + JOL2/10
where LT is the total sound pressure level and LI, L2, etc are the individual sound pressure levels.
Certain equipment installations may include the placement of absorptive materials and barriers to
reduce acoustical emissions from the installation. Published in various engineering handbooks are
Noise Reduction Coefficients ("NRC") for many different materials, expressed as unitless power
factors, with 0 being perfect reflection and 1 being perfect absorption. Unpainted concrete block, for
instance, can have an NRC as high as 0.35. However, a barrier's effectiveness, known as its Sound
Transmission Class ("STC"), depends on its specific configuration, as well as the materials used and
their surface treatment.
HAMMETT & EDISON, INC.
CONSULTING ENGINEERS Methodology
HESAN FRANCISCO
Figure 1
T -Mobile • Proposed Base Station (Site No. SF44041)
Homestead Road • Cupertino, California
Location of Proposed Base Station Cabinets
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HEHAMMETT & EDISON, INC.
CONSULTING ENGINEERS TM44041596
SAN FRANCISCO Figure 2
46 0
sutro consulting Exhibit A
4166 Clarinbridge Circle - Dublin, CA 94568 - www.sutroconsulting.com
44041 : PG&E Stelling Substation
Address: N. Stelling Road @ Homestead Road, Cupertino, CA 94087
Zone: BQ (Quasi -public building)
APN: 326-07-035
Project Description
T -mobile is proposing to construct, operate and maintain a wireless telecommunications facility
on an existing PG&E lattice tower within a substation. The substation is located at the
intersection of North Stelling Road and Homestead Road. The proposed facility will consist of
four (4) sectors, with two (2) antennas per sector, totaling eight (8) antennas. The proposed
antennas will be mounted on a new PG&E seven foot (7') extension at the top of the existing
lattice tower. The existing tower stands eighty-seven feet, seven and one-fourth inches (87'-7
1/4") tall in height. The proposed lattice extension and antennas will stand ninety-four feet,
three and one-half inches (94'-3 '/2"). T -mobile also proposed to locate a two feet (2') in
diameter microwave dish to be located just below the proposed antennas. The antennas,
microwave dish, and all cables will be painted/ordered grey to match the color of the lattice
tower. The Base Transceiver Station (BTS) equipment cabinets will be placed directly under the
lattice tower on a concrete slab, within a new wood slat fence. In addition, a new chain link
fence will be place outside of the tower.
The location and configuration of the proposed antennas have been selected to achieve the
functional requirements for T -mobile Radio Frequency Engineers. As referenced in the RF
Coverage Maps, T -Mobile subscribers experience minimal or loss of coverage along
Homestead Road from state route 85 heading east towards North De Anza Boulevard. The
development of this portion of the network will allow its customers seamless access to a
nationwide network of services, whether driving, working or residing in this particular area.
Much like the other carriers and as a mandate by the FCC, T -mobile seeks to provide an
additional communication infrastructure to the wireless community. This location was also
selected because of its position relative to existing sites, providing favorable site geometry for
federally mandated E911 location accuracy requirements. Since 40 percent of 911 calls are
from mobile phones, effective site geometry within the overall network is needed to achieve
accurate location information of mobile users, through triangulation with active wireless facilities.
Safety and Compliance
The proposed facility will not be detrimental to the character of development, as it will be
unstaffed, having no impact on parking or traffic. After construction of the facility, the site will be
serviced once a month, during a routine scheduled maintenance window by a service
technician. Furthermore, the facility will generate no noise, odor, smoke or any other adverse
impacts to adjacent land uses. T -Mobile technology does not interfere with any other forms of
private or public communications systems. In addition, the proposed wireless
telecommunications facility will operate in full compliance with all local, state and federal
regulations including the Telecommunications Act of 1996.
T -Mobile Company Information
Based in Bellevue, Washington, the U.S. operations of T -Mobile International AG & Co. K.G.,
consists of T -Mobile USA, Inc. (formerly VoiceStream Wireless) and Powertel, Inc. (together "T -
Page 1 of 2
r •
sutro consulting
4166 Clarinbridge Circle • Dublin, CA 94568 • www.sutroconsuffing.com
Mobile"). A cornerstone of T -Mobile's strong consumer appeal has been its Get More®
business strategy to provide customers with the best overall value in their wireless service so
they can enjoy the benefits of mobile communications to Get More From Life®. T -Mobile has
more than 24,000 employees across the country dedicated to delivering on its Get More®
promise to provide customers with more minutes, more features and more service. The T -
Mobile global brand name made its debut in the United States in July 2002, choosing California
and Nevada as the first markets in the country to launch its wireless voice and data services.
Here in the Bay Area, T -Mobile has purchased and taken control of the former PacBell Wireless/
Cingular System on January 5, 2005. T -Mobile operates an all-digital, national wireless network
based exclusively on GSM technology. T -Mobile holds a license in the California Market as
follows: 1950.2-1964.8, 1965.2-1969.8 MHz and 1870.2-1884.8, 1885.2-1889.8 MHz.
T -Mobile Site Selection/Co-location/Height Justification
In an effort to minimize the number of new facilities in an area, T -Mobile is always looking for
opportunities to co -locate on existing buildings, utility poles or existing wireless structures. For
this particular site, T -Mobile identified a PG&E lattice tower, which currently has no carriers.
Unfortunately, the tower has a series of conductors which requires PG&E to extend the tower in
order to have the necessary clearance between antennas and conductors. The City of
Cupertino Wireless Communications Facilities Ordinance states that non -building mounted
facilities have a height limit of fifty-five feet (55). Although this proposal will not be located on a
building, it will be located on an existing (87'-7 '/4") structure. The PG&E tower is a permanent
existing structure that has proven to be a good alternative for antenna placement throughout
multiple cities in lieu of new free-standing facilities. T -mobile is requesting to extend the tower
slightly strictly for safety and interference reasons. PG&E could not allow T -mobile to locate on
their tower without the (approximately 7') extension.
Since their introduction, wireless telecommunications systems have proven to be an invaluable
communications tool in the event of emergencies (traffic accidents, fires, etc.) and natural
disasters (earthquakes, floods, etc.) where normal land line communications are often
disrupted, overlooked, or inaccessible during and after an even has occurred. This service and
similar technology are utilized by numerous governmental and quasi -governmental agencies
that provide emergency service. Wireless telecommunications systems, including cellular
telephones, have also proven to be invaluable tools in business communications and everyday
personal use. In this sense, wireless telecommunications system networks are desirable in the
interest of public convenience, health, safety and welfare, and thus are proper in relation to the
development community.
Unlike other land uses, which can be spatially determined through the General Plan, the
location of wireless telecommunication facilities is based on technical requirements which
include service area, geographical elevations, alignment with surrounding sites and customer
demand components. Placement within the urban geography is dependent on these
requirements. Consequently, wireless telecommunication facilities have been located adjacent
to and within all major land use categories including residential, commercial, industrial, open
space, etc. proving to be compatible in all locations.
Page 2 of 2
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T -Mobile • Proposed Base Station (Site No. SF44041)�71Ch1�11t C
Noranda Drive and Homestead Avenue • fid, California
�u PEr-rao
Statement of Hammett & Edison, Inc., Consulting Engineers
The firm of Hammett & Edison, Inc., Consulting Engineers, has been retained on behalf of T -Mobile,
a personal wireless telecommunications carrier, to evaluate the base station (Site No. SF44041)
proposed to be located at Noranda Drive and Homestead Avenue in Sunnyvale, California, for
compliance with appropriate guidelines limiting human exposure to radio frequency ("RF")
electromagnetic fields.
Prevailing Exposure Standards
The U.S. Congress requires that the Federal Communications Commission ("FCC") evaluate its
actions for possible significant impact on the environment. In Docket 93-62, effective October 15,
1997, the FCC adopted the human exposure limits for field strength and power density recommended
in Report No. 86, "Biological Effects and Exposure Criteria for Radiofrequency Electromagnetic
Fields," published in 1986 by the Congressionally chartered National Council on Radiation Protection
and Measurements ("NCRP"). Separate limits apply for occupational and public exposure conditions,
with the latter limits generally five times more restrictive. The more recent standard, developed by the
Institute of Electrical and Electronics Engineers and approved as American National Standard
ANSVIEEE C95.1-2006, "Safety Levels with Respect to Human Exposure to Radio Frequency
Electromagnetic Fields, 3 kHz to 300 GHz," includes similar exposure limits. A summary of the
FCC's exposure limits is shown in Figure 1. These limits apply for continuous exposures and are
intended to provide a prudent margin of safety for all persons, regardless of age, gender, size, or
health.
The most restrictive FCC limit for exposures of unlimited duration to radio frequency energy for
several personal wireless services are as follows:
Personal Wireless Service
Approx. Frequency
Occupational Limit
Public Limit
Broadband Radio (`BRS")
2,600 MHz
5.00 mW/cm2
1.00 mW/cm2
Advanced Wireless ("AWS")
2,100
5.00
1.00
Personal Communication ("PCS")
1,950
5.00
1.00
Cellular Telephone
870
2.90
0.58
Specialized Mobile Radio ("SMR")
855
2.85
0.57
Long Term Evolution ("LTE")
700
2.15
0.43
[most restrictive frequency range]
30-300
1.00
0.20
General Facility Requirements
Base stations typically consist of two distinct parts: the electronic transceivers (also called "radios" or
"channels") that are connected to the traditional wired telephone lines, and the passive antennas that
send the wireless signals created by the radios out to be received by individual subscriber units. The
HEHAmmETT & EDISON, INC.
CONSULTING ENGINEERS TM44041596
SAN FRANCISCO Pagel of 3
T -Mobile • Proposed Base Station (Site No. SF44041)
Noranda Drive and Homestead Avenue • Sunnyvale, California
transceivers are often located at ground level and are connected to the antennas by coaxial cables
about 1 inch thick. Because of the short wavelength of the frequencies assigned by the FCC for
wireless services, the antennas require line -of -sight paths for their signals to propagate well and so are
installed at some height above ground. The antennas are designed to concentrate their energy toward
the horizon, with very little energy wasted toward the sky or the ground. Along with the low power of
such facilities, this means that it is generally not possible for exposure conditions to approach the
maximum permissible exposure limits without being physically very near the antennas.
Computer Modeling Method
The FCC provides direction for determining compliance in its Office of Engineering and Technology
Bulletin No. 65, `Evaluating Compliance with FCC -Specified Guidelines for Human Exposure to
Radio Frequency Radiation," dated August 1997. Figure 2 attached describes the calculation
methodologies, reflecting the facts that a directional antenna's radiation pattern is not fully formed at
locations very close by (the "near -field" effect) and that at greater distances the power level from an
energy source decreases with the square of the distance from it (the "inverse square law"). The
conservative nature of this method for evaluating exposure conditions has been verified by numerous
field tests.
Site and Facility Description
Based upon information provided by T Mobile, including drawings by Michael Wilk Architecture,
dated December 17, 2008, it is proposed to mount eight RFS Model directional panel PCS antennas on
a 7 -foot extension to be added above an existing PG&E lattice tower located on the grounds of the
substation near the intersection of Noranda Drive and Homestead Avenue in Sunnyvale. The antennas
would be mounted with 3° downtilt at an effective height of about 92 feet above ground and would be
oriented in pairs toward 40°T, 140°T, 210°T, and 310°T, to provide service in all directions. The
maximum effective radiated power in any direction would be 3,000 watts, representing simultaneous
operation at 2,000 and 1,000 watts for PCS and AWS service, respectively. Also proposed to be
mounted lower on the same tower is a 2 -foot microwave "dish" antenna, for interconnection of this
site with others in the T -Mobile network. There are reported no other wireless telecommunications
base stations located nearby.
Study Results
For a person anywhere at ground, the maximum ambient RF exposure level due to the proposed
T -Mobile operation is calculated to be 0.00085 mW/cm2, which is 0.085% of the applicable public
exposure limit. The maximum calculated level at the second -floor elevation of any nearby building
would be 0.11% of the public exposure limit. It should be noted that these results include several
HEHAMMETT & EDISON, INC.
CONSULTING ENGINEERS TM44041596
SAN FRANCISCO Page 2 of 3
r •
T -Mobile • Proposed Base Station (Site No. SF44041)
Noranda Drive and Homestead Avenue • Sunnyvale, California
"worst-case" assumptions and therefore are expected to overstate actual power density levels. The
microwave antenna would be in point-to-point service and is so directional that it makes no significant
contribution to RF exposure conditions at ground level.
No Recommended Mitigation Measures
Since they are to be mounted on a PG&E tower, the T Mobile antennas would not be accessible to the
general public, and so no mitigation measures are necessary to comply with the FCC public exposure
guidelines. It is presumed that PG&E already takes adequate precautions to ensure that there is no
unauthorized access to its tower. To prevent exposures in excess of the occupational limit by
authorized PG&E workers, it is expected that they will adhere to appropriate safety protocols adopted
by that company.
Conclusion
Based on the information and analysis above, it is the undersigned's professional opinion that the base
station proposed by T -Mobile at Noranda Drive and Homestead Avenue in Sunnyvale, California, will
comply with the prevailing standards for limiting public exposure to radio frequency energy and,
therefore, will not for this reason cause a significant impact on the environment. The highest
calculated level in publicly accessible areas is much less than the prevailing standards allow for
exposures of unlimited duration. This finding is consistent with measurements of actual exposure
conditions taken at other operating base stations.
Authorship
The undersigned author of this statement is a qualified Professional Engineer, holding California
Registration Nos. E-13026 and M-20676, which expire on June 30, 2009. This work has been carried
out by him or under his direction, and all statements are true and correct of his own knowledge except,
where noted, when data has been supplied by others, which data he believes to be correct.
December 19, 2008
HAMMETT & EDISON, INC.
e CONSULTING ENGINEERS TM44041596
SAN FRANCISCO Page 3 of 3
FCC Radio Frequency Protection Guide
The U.S. Congress required (1996 Telecom Act) the Federal Communications Commission ("FCC")
to adopt a nationwide human exposure standard to ensure that its licensees do not, cumulatively, have
a significant impact on the environment. The FCC adopted the limits from Report No. 86, "Biological
Effects and Exposure Criteria for Radiofrequency Electromagnetic Fields," published in 1986 by the
Congressionally chartered National Council on Radiation Protection and Measurements ("NCRP").
Separate limits apply for occupational and public exposure conditions, with the latter limits generally
five times more restrictive. The more recent standard, developed by the Institute of Electrical and
Electronics Engineers and approved as American National Standard ANSI/IEEE C95.1-2006, "Safety
Levels with Respect to Human Exposure to Radio Frequency Electromagnetic Fields, 3 kHz to
300 GHz," includes similar limits. These limits apply for continuous exposures from all sources and
are intended to provide a prudent margin of safety for all persons, regardless of age, gender, size, or
health.
As shown in the table and chart below, separate limits apply for occupational and public exposure
conditions, with the latter limits (in italics and/or dashed) up to five times more restrictive:
Frequency
Applicable
Range
(MHz)
0.3— 1.34
1.34— 3.0
3.0— 30
30— 300
300— 1,500
1,500— 100,000
1000
100
3 10
r3
0.1
Electromametic Fields (f is frequency of emission in MHz
Electric
Magnetic
Equivalent Far -Field
Field Strength
Field Strength
Power Density
(V/m)
(A/m)
(mW/cm2)
614 614
1.63 1.63
100 100
614 823.81f
1.63 2.191f
100 18011
1842/f 823.81f
4.89/f 2.191f
900/f2 18011
61.4 27.5
0.163 0.0729
1.0 0.2
3.54-Tf 1.59ff
14/106 Nf/238
f/300 f/1500
137 61.4
0.364 0.163
5.0 1.0
Occupational Exposure
PCS
Cell
FM
00o0 -
Public Exposure
0.1 1 10 100 103 104 105
Frequency (MHz)
Higher levels are allowed for short periods of time, such that total exposure levels averaged over six or
thirty minutes, for occupational or public settings, respectively, do not exceed the limits, and higher
levels also are allowed for exposures to small areas, such that the spatially averaged levels do not
exceed the limits. However, neither of these allowances is incorporated in the conservative calculation
formulas in the FCC Office of Engineering and Technology Bulletin No. 65 (August 1997) for
projecting field levels. Hammett & Edison has built those formulas into a proprietary program that
calculates, at each location on an arbitrary rectangular grid, the total expected power density from any
number of individual radio sources. The program allows for the description of buildings and uneven
terrain, if required to obtain more accurate projections.
KEHAMMETT & EDISON, INC.
CONSUL'I'NG ENGINEERS FCC Guidelines
SAN FRANCISCO Figure 1
RFR.CALCTM Calculation Methodology
Assessment by Calculation of Compliance with FCC Exposure Guidelines
The U.S. Congress required (1996 Telecom Act) the Federal Communications Commission ("FCC") to
adopt a nationwide human exposure standard to ensure that its licensees do not, cumulatively, have a
significant impact on the environment. The maximum permissible exposure limits adopted by the FCC
(see Figure 1) apply for continuous exposures from all sources and are intended to provide a prudent
margin of safety for all persons, regardless of age, gender, size, or health. Higher levels are allowed for
short periods of time, such that total exposure levels averaged over six or thirty minutes, for
occupational or public settings, respectively, do not exceed the limits.
Near Field.
Prediction methods have been developed for the near field zone of panel (directional) and whip
(omnidirectional) antennas, typical at wireless telecommunications base stations, as well as dish
(aperture) antennas, typically used for microwave links. The antenna patterns are not fully formed in
the near field at these antennas, and the FCC Office of Engineering and Technology Bulletin No. 65
(August 1997) gives suitable formulas for calculating power density within such zones.
For a panel or whip antenna, power density S = 180 x 0.1 x Pnet In mWICM2,
OBw rrxD xh
x�
and for an aperture antenna, maximum power density S�nax = 0.1x 16 x ti xPnet , In MW/CM2,
where OBW = half -power beamwidth of the antenna, in degrees, and
Pnet = net power input to the antenna, in watts,
D = distance from antenna, in meters,
h = aperture height of the antenna, in meters, and
q = aperture efficiency (unitless, typically 0.5-0.8).
The factor of 0.1 in the numerators converts to the desired units of power density.
Far Field.
OET-65 gives this formula for calculating power density in the far field of an individual RF source:
2.56x1.64x100xRFF2 xERP, in MW/CM2,
4 x,7r x D
where ERP = total ERP (all polarizations), in kilowatts,
RFF = relative field factor at the direction to the actual point of calculation, and
D = distance from the center of radiation to the point of calculation, in meters.
The factor of 2.56 accounts for the increase in power density due to ground reflection, assuming a
reflection coefficient of 1.6 (1.6 x 1.6 = 2.56). The factor of 1.64 is the gain of a half -wave dipole
relative to an isotropic radiator. The factor of 100 in the numerator converts to the desired units of
power density. This formula has been built into a proprietary program that calculates, at each location
on an arbitrary rectangular grid, the total expected power density from any number of individual
radiation sources. The program also allows for the description of uneven terrain in the vicinity, to
obtain more accurate projections.
HEHAMMETT & EDISON, INC.
CONSULTING ENGINEERS Methodology
SAN FRANCISCO Figure 2
Exhibit D
T -Mobile • Proposed Base Station (Site No. SF44041)
Homestead Road • Cupertino, California
Statement of Hammett & Edison, Inc., Consulting Engineers
The firm of Hammett & Edison, Inc., Consulting Engineers, has been retained on behalf of T -Mobile, a
personal wireless telecommunications carrier, to evaluate the base station (Site No. SF44041) proposed
to be located at the PG&E substation located off Homestead Road in Cupertino, California, near North
Stelling Road, for compliance with appropriate guidelines limiting noise emission levels.
Prevailing Standards
Noise standards from two different jurisdictions are used for this evaluation: Cupertino, since the site
is located in that city, and Sunnyvale, since there adjoining parcels in that city, as shown in Figure 2
attached. The City of Cupertino sets forth limits on sound levels in Chapter 10.48.040 "Daytime and
Nighttime Maximum Noise Levels" of its municipal code, as follows for the indicated zones:
Zone Time Period
Noise Limit
Residential "Day" 7 a.m. to 10 p.m.
60 dBA
"Night" 10 p.m. to 7 a.m.
50 dBA
Non-residential "Day" 7 a.m. to 10 p.m.
65 dBA
"Night" 10 p.m. to 7 a.m.
55 dBA
The City of Sunnyvale establishes limits on noise in Chapter 19.42.030 "Noise or Sound Level" of its
municipal code, which says in pertinent part:
Operational noise shall not exceed 75 dBA at any point on the property line of the premises upon
which the noise or sound is generated or produced; provided, however, that the noise or sound level
shall not exceed 50 dBA during nighttime or 60 dBA during daytime hours at any point on adjacent
residentially zoned property.
Figure 1 attached describes the calculation methodology used to determine applicable noise levels for
evaluation against the prevailing standard.
General Facility Requirements
Wireless telecommunications facilities ("cell sites") typically consist of two distinct parts: the
electronic base transceiver stations ("BTS" or "cabinets") that are connected to traditional wired
telephone lines, and the antennas that send wireless signals created by the BTS out to be received by
individual subscriber units. The BTS are often located outdoors at ground level and are connected to
the antennas by coaxial cables about 1 inch thick. The BTS typically require environmental units to
cool the electronics inside. Such cooling is often integrated into the BTS, although external air
conditioning ("AC") may be installed, especially when the BTS are housed within a larger enclosure.
Most cell sites have back-up battery power available, to run the facility for some number of hours in
the event of a power outage. Many sites have back-up power generators installed, to run the facility
during an extended power outage.
HAMMETT & EDISON, INC. TM44041596
CONSULTING ENGINEERS
SAN FRANCISCO Page 1 of 2
T -Mobile - Proposed Base Station (Site No. SF44041)
Homestead Road - Cupertino, California
Site Description
Based upon information provided by T -Mobile, including drawings by Michael Wilk Architecture,
dated December 17, 2008, that carrier proposes to install four RBS Model 2106 radio cabinets in pairs
facing each other within a wood fence enclosure to be built under an existing lattice tower sited near the
southwest corner of the PG&E substation located at the end of a driveway off Homestead Avenue in
Cupertino and behind residential buildings on Noranda Drive in Sunnyvale. T -Mobile also proposes
install directional panel PCS antennas on a 7 -foot extension to be added above that tower, but this
portion of the base station facility does not generate acoustic noise. No stand-by power generator is
proposed for installation at this site.
Study Results
The manufacturer of the cabinets reports that maximum acoustic noise levels are 62, 59, 53, and
58 dBA, measured at 1 meter to front, right, rear, and left of the units, respectively. Based on this
data, the maximum sound pressure at the nearest property line, a non-residential parcel less than
10 feet to the south, is 52.6 dBA; this is less than the Cupertino nighttime limit of 55 dBA applicable
at that location. At the nearest residential property in Cupertino, some 390 feet to the southeast, the
maximum sound pressure level is 23.7 dBA, well below the Cupertino nighttime limit of 50 dBA at
that location. Sunnyvale would apply a limit of 75 dBA limit at the property line of the site itself,
were it in that jurisdiction, and the proposed installation meets that limit. Along the property line to
the west, at the border with Sunnyvale, the maximum sound pressure level is 43.9 dBA; this is less
than the Sunnyvale residential nighttime limit of 50 dBA.
Summary
Based on the information and analysis above, it is the undersigned's professional opinion that the
T -Mobile base station proposed to be located off Homestead Avenue in Cupertino behind Noranda
Drive in Sunnyvale will comply with the standards of those cities limiting noise levels.
Authorship
The undersigned author of this statement is a qualified Professional Engineer, holding California
Registration Nos. E-13026 and M-20676, which expire on June 30, 2009. This work has been carried
out under his direction, and all statements are true and correct of his own knowledge except, where
noted, when data has been suppl
December 29, 2008
HAMMETT & EDISON, INC.
CONSULMZG ENGINEERS
SAN FRANCISCO
hich data he believes to be correct.
E-13026
M-20676 William F. 1
EV. 6-30-09
,�CFIAN�GP�`Q'
UV441�_�
P.E.
TM44041596
Page 2 of 2
Noise Level Calculation Methodology
Most municipalities and other agencies specify noise limits in units of dBA, which is intended to
mimic the reduced receptivity of the human ear to Sound Pressure ("LP") at particularly low or high
frequencies. This frequency -sensitive filter shape, shown
in the graph to the right as defined in the International
Electrotechnical Commission Standard No. 179, the
American National Standards Institute Standard No. 5.1,
C
and various other standards, is also incorporated into most
calibrated field test equipment for measuring noise levels.
In analyzing situations where the frequency composition of
the emitted noise is not known, the A filter can be
disregarded, and it is seen that the results should be
conservative.
da
FROM
MrIWed again5o 4 WON
A t. slurp
50.
40
30
s 10 15 20 25 30 35 40
io
0
-i0
-20
-30
-40
-50
-60
-70
-80
10 100 1000 10000
Frequency (Hz)
Manufacturers of many types of equipment, such as air
conditioners, generators, and telecommunications devices,
often test their products in various configurations to
determine the acoustical emissions at certain distances. This
data, often presented as shown in the typical chart to the left,
can be used to determine the sound pressure level at any
particular distance, such as at a nearby building or property
line. The sound pressure drops as the square of the increase in distance, according to the formula:
where LP is the sound pressure level at distance DP and LK
is the known sound pressure level at distance DK. LP = LK + 20 log(DK/DP),
Individual sound pressure levels at a particular point from several different noise sources cannot be
combined directly in units of dBA. Rather, the units need to be converted to scalar sound intensity
units in order to be added together, then converted back to decibel units, according to the formula:
LT = 10 log (IOL,/10 + 10 L2/10 + ...),
where LT is the total sound pressure level and LI, Lz, etc are the individual sound pressure levels.
Certain equipment installations may include the placement of absorptive materials and barriers to
reduce acoustical emissions from the installation. Published in various engineering handbooks are
Noise Reduction Coefficients ("NRC") for many different materials, expressed as unitless power
factors, with 0 being perfect reflection and 1 being perfect absorption. Unpainted concrete block, for
instance, can have an NRC as high as 0.35. However, a barrier's effectiveness, known as its Sound
Transmission Class ("STC"), depends on its specific configuration, as well as the materials used and
their surface treatment.
HAMMETT & EDISON, INC.
CONSULTING ENGINEERS Methodology
SAN FRANCISCO Figure 1
T -Mobile • Proposed Base Station (Site No. SF44041)
Homestead Road • Cupertino, California
Location of Proposed Base Station Cabinets
NNOW. 17"
" ~ New=BTS,
HEHAMMETT & EDISON, INC.
CONSULTING ENGINFFRS
SAN FRANCISCO
Aerial
photo from Google Maps
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11
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TM44041596
Figure 2
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Colin Jung Exhibit F
From: Peter Friedland [peterfriedland @gmail. com]
Sent: Friday, February 13, 2009 4:26 PM
To: Colin Jung; 'amgadre@hotmail.com'
Subject: Re: Review of T -Mobile personal wireless service facility near Homestead Rd. & N. Stelling
Rd.
Colin,
I examined the application. I don't see any significant problems except
for the permission to reduce the 50 foot requirement. I gather the
existing PG&E tower is already that close to a property line. However,
given how high up the actual antennas will be I think the actual measured
distance from the residential property to the antenna face is fine. The
height exception makes sense and from my point of view it shouldn't be a
problem.
Remind me when (and approximate time) the Planning Commission hearing will
be. And make sure to put comments from the TICC formally on the agenda,
not requiring us to submit a card. I check with the PC on this.
Peter
At 02:37 PM 2/10/2009, Colin Jung wrote:
>Peter & Avinash:
>I am referring a plan set as described below to the designated TIC
>Commissioners for review and comment. The project involves the
>development of a T -Mobile personal wireless service facility at the PG& E
>substation located in the southwest quadrant of North Stelling Road and
>Homestead Road. The antennae are proposed to be arranged in a top hat
>design on the lattice tower with the base equipment located in a fenced
>enclosure between the tower legs. The applications include:
>File No. EXC-2008-17: A height exception to allow 8 panel antennae to be
>mounted at a height of 94 feet 4 inches and a microwave dish to be mounted
>at a height of 85 feet 6 inches on a lattice tower where 55 feet is allowed.
>File No. V-2008-01: A variance to allow panel antennae of a personal
>wireless service facility to be setback a minimum of 25 feet and a
>microwave dish to be setback 24 feet from a residential property line
>where 50 feet is required.
>File No. DIR-2008-37: A Director's Minor Modification to allow the
>construction of a personal wireless service facility, consisting of 8
>panel antennae and a microwave dish mounted on a rack affixed to an
>existing PG& E lattice tower and a base equipment enclosure located
>beneath the lattice tower.
>The plan set and the applicant's letter is attached. Other documents:
>photosimulation, RF emissions assessment, coverage maps are available upon
>request. I would appreciate any comments by: February 17, 2009.
>Colin Jung
>Senior Planner
>City of Cupertino
>408-777-3257
>fax: 408-777-3333
1
Colin Jun
From: Avinash Gadre [amgadre@hotmail.com]
Sent: Friday, February 13, 2009 7:57 PM
To: Colin Jung, Peter Friedland
Subject: Re: Review of T -Mobile personal wireless service facility near Homestead Rd. & N. Stelling
Rd.
Colin
My comments
1. If Wireless providers are always going to need height more than 50 feet
then why not change the regulations ? Anyway we allow PG&E to have higher
towers.
2. As Peter suggested, height of the antennae will probably help us relax
the requirement of 50 ft from residential properties.
Regards
Avinash
----- Original Message -----
From: "Colin Jung" <ColinJ@cupertino.org>
To: "Peter Friedland" <peterfriedland@gmail.com>; <amgadre@hotmail.com>
Sent: Tuesday, February 10, 2009 2:37 PM
Subject: Review of T -Mobile personal wireless service facility near
Homestead Rd. & N. Stelling Rd.
Peter & Avinash:
I am referring a plan set as described below to the designated TIC
Commissioners for review and comment. The project involves the development
of a T -Mobile personal wireless service facility at the PG& E substation
located in the southwest quadrant of North Stelling Road and Homestead Road.
The antennae are proposed to be arranged in a top hat design on the lattice
tower with the base equipment located in a fenced enclosure between the
tower legs. The applications include:
File No. EXC-2008-17: A height exception to allow 8 panel antennae to be
mounted at a height of 94 feet 4 inches and a microwave dish to be mounted
at a height of 85 feet 6 inches on a lattice tower where 55 feet is allowed.
File No. V-2008-01: A variance to allow panel antennae of a personal
wireless service facility to be setback a minimum of 25 feet and a microwave
dish to be setback 24 feet from a residential property line where 50 feet is
required.
File No. DIR-2008-37: A Director's Minor Modification to allow the
construction of a personal wireless service facility, consisting of 8 panel
antennae and a microwave dish mounted on a rack affixed to an existing PG& E
lattice tower and a base equipment enclosure located beneath the lattice
tower.
The plan set and the applicant's letter is attached. Other documents:
photosimulation, RF emissions assessment, coverage maps are available upon
request. I would appreciate any comments by: February 17, 2009.
Colin Jung
Senior Planner
1
February 19, 2009
To,
Colin Jung
Senior Planner
City of Cupertino
Subject: Regarding the development of a T -Mobile personal wireless
service facility at the PG& E substation located in the southwest
quadrant of North Stelling Road and Homestead Road
Dear Colin,
Thank you for referring the application to us for a proposed T -mobile wireless
service facility in the vicinity of the City of Sunnyvale. The proposed project is
located adjacent to a multi -family residential development on Noranda Drive in
Sunnyvale. Staff reviewed the drawings/ attached documents and has the
following comments:
1. The proposed site is located at an approximate distance of 25'-30' from
the rear property line of residential properties in Sunnyvale. As noted in
your email, Cupertino's telecom ordinance requires a minimum setback
of 50 feet from residential properties which triggers a variance for the
subject application. As a reference, Section 19.54.030 of Sunnyvale's
zoning code requires that "freestanding facilities, including towers, lattice
towers and monopoles, shall be restricted to a maximum height of 65'
when located adjacent to residential zoned properties. Facilities shall be
setback at a ratio of two horizontal feet for every one foot in height." It
appears that the applicant has selected a site that would likely maximize
the negative impacts on adjoining residential property owners due its
proximity.
a. Has the applicant provided an alternative sites analysis with
information on why other sites in the area are not feasible for
locating a similar facility?
b. The PG&E tower closest to the residential properties has been
selected for the wireless facility. Staff noted that there are three
other lattice towers located on the same site that are farther away
from the adjoining homes. Is the City satisfied with the level of
detail provided by the applicant as justification for a 95' tall tower
located immediately adjacent to residential properties?
P.O. BOX 3707 SUNNYVALE, CALIFORNIA 94088-3707 /planning*ci.sunnyvalexa.us
TDD (408) 730-7501
c. For the purpose of comparison, it may be helpful if the applicant
provided coverage maps for a scenario where the antennas are
located on a different tower on the same property - doing so might
suggest a way to compromise between T -mobile's coverage needs
and potential impacts on residential properties ?
d. There will likely be some noise impacts resulting from the BTS
cabinets and generators proposed to be located beneath the tower.
Could the applicant provide additional information on the noise
levels (as heard by adjacent residents) generated by proposed
equipment and mitigation measures proposed, if any?
2. Sunnyvale residents in the vicinity of the subject site would appreciate
an opportunity to provide comments on the subject project during the
public hearing. We would be happy to provide you with names and
addresses of Sunnyvale residents in the area or assist in any other way
with the noticing process.
Thanks again for the opportunity to provide input on the project. We look
forward to working closely with the City of Cupertino on issues that impact
residents of both communities.
Best regards,
Surachita Bose, AICP
Associate Planner
City of Sunnyvale
Ph: 408-730-7443
Email: sbose(a,ci.sunnyvale.ca.us
P.O. BOX 3707 SUNNYVALE, CALIFORNIA 94088-3707 /planning4)CLsunnyvalexa.us
TDD (408) 730-7501