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RF Study_2.pdfU WE DELIVER ENERGY." Letter of Authorization — Fee Property Telecommunications Business Development Us Mail. Pacific Gas and Electric Company 245 Market Street Mail Code N10D San Francisco, CA 94105-1702 Fax: 415-973-3884 Wireless Provider: T -Mobile West LLC Location: Stelling Substation, Noranda Dr. & Homestead Rd., Sunnyvale SBE: 135-43-5213-1 Tower: 41169129 (002/011) Stelling-Monte Vista 115kV Pacific Gas and Electric Company (PG&E), as the owner of the property referenced above, and pursuant to the terms and conditions of Master License Agreement for Antenna Attachments entered into as of May 12, 2018, between Pacific Gas and Electric Company, a California corporation ("PG&E") and T -MOBILE WEST LLC, a Delaware limited liability company and MetroPCS California, LLC, a Delaware limited liability company (collectively, "Wireless Provider"), hereby authorizes the Wireless Provider, its agents, and contractors to: • Access the PG&E Land referenced above, following advanced notice to PG&E. • Conduct necessary activities such as site design visits, radio frequency tests subject to PG&E's prior review and approval. • Apply for and obtain all land use approvals and permits, to order building permit plans and architectural/engineering drawings which are appropriate for the installation, construction, and continued operation of a wireless communications site (including antennas and all ancillary equipment and structures). This Letter of Authorization is subject to the following conditions: • The Wireless Provider shall be solely responsible for satisfying all conditions of approval that may be contained in a conditional use permit issued by the responsible jurisdiction on behalf of "owner," "applicant" and/or "development permit holder" as referenced in the conditional use permit for as long as the same may exist (without regard to the term of the Master License Agreement). Prior to the issuance of any conditional use permit, all conditions of approval, associated with permit must be reviewed and approved by PG&E's Land Department. • As the applicant, the Wireless Provider shall be solely responsible for the payment of all agency fees including, but not limited to application fees, costs of agency review and permitting fees. • Before entering the PG&E Land, the Wireless Provider, shall furnish PG&E's Land Department with satisfactory evidence that the Wireless Provider has procured the insurance policies and coverages set forth in the Master License Agreement. • The Wireless Provider shall provide 24-hour advanced notice to PG&E's Land Department prior to entry on the PG&E Land by contacting Morgan Bunone at (415) 973-5559. • The Wireless Provider, its agents and contractors shall not interfere with or impair PG&E's use of the PG&E Facilities and Land. • The Wireless Provider's activities under this Letter of Authorization are subject to all of the terms and conditions set forth the Master License Agreement. Date: Z- Z h t Morgan Buno Land Agent, and Management Site #: TM-SF44041 Pacific Gas and Electric Company Site Name: Stelling Sub T -Motile o Proposed Base Station (Site No. SF44041) Noranda Drive and Homestead Avenue • Sunnyvale, 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 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 ANSUIEEE 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 R PRIHAMMETT & EDISON, INC. sq-a�' CONSULTING ENGINEERS TM44041596 "a i ` SAN FRANCism Page 1 of 3 T -Mobile • Proposed Base Station (Site No. SF44049) 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 HAMMETT & EDISON, INC. TM44041596 eir 111" �CONSULTING BNGINFMas Page 2 of 3 a SAN FRANCISCO T -Mobile. Proposed Ease Station (Site No. SF44049) 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 InWK HAMMETT & EDISON, INC. TM44041596 % � NN CONSULTING ENGINEERS &--,. SANFfRANCISCO 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— 10 3.0— 30 30— 300 300— 1,500 1,500— 100,000 1000 100 10 0.1 Electromagnetic Fields_lfis frequency of emission in MHz Electric Magnetic Equivalent Far -Field Field Strength Field Strength Power Density (v/m) (A/in) (mW/cm2) 614 614 1.63 1:63 100 100 614 823.8/f 1.63 2.191f 100 1801 1842/ f 823.81f 4.89/ f 2.191f 900/ f' 1801 f' 61.4 27.5 0.163 0.0729 1.0 0.2 3.544f 1.59,Tf ff/1.06 Vf1238 0300 f11500 137 61.4 0.364 0.163 5.0 1.0 / Occupational Exposure PCS FM Cell Public .Ex osure 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. wUmOq HAMMETT & EDISON, INC. " FCC Guidelines CONSULTING ENGINEERS . SU ti °". N=, - SAN Fn wcrsca 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 P°�` , in. mW/2 Qsw jtxD xh 0.1x16x77xP„,t and for an aperture antenna, maximum power density Smax = n x h2 , in MW/cm2, where 0BW = 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 71 = 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. OBT 65 gives this formula for calculating power density in the far field of an individual RF source: 2.56 x 1.64 x 100 x RFF 2 xERP power density S = in znW/cm2, 4x,nxD2 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. -1 HAMMETT & EDISON, INC. CONISUMNG WGINFER.s Methodology Uh SAN FRANaSCo Figure 2 n OP1.1 Imam r Citi+t N-APMR� ;,L„Y�vrsr t' .C.ae- f �4 u•� RI - F u-42.MW 33 - �• � � '•+ 37 � ��.. s� �'. f"-`�'�,��r�- �' -ter '�' � �� Ma •eh•�2nn u,-:...iq:�no.a�i�a. __ , — - � cased w ov ... + J N ..].I c i... ., i _5 It _ .: :5 '�-�,�.. �� 5��.:��, c.. �: .. i _ :5