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Home My WebLink About3.2Item 3.2 Town of Los Altos Hills October 1, 2009 Staff Report to the Planning Commission RE: A REQUEST FOR A CONDITIONAL USE PERMIT RENEWAL AND MODIFICATION TO AN EXISTING WIRELESS COMMUNICATIONS FACILITY; LANDS OF PURISSEVIA HILLS WATER DISTRICT (APPLICANT: VERIZON WIRELESS); 12862 LA CRESTA DRIVE; PERMIT #122 -09 -CUP. FROM: Cynthia Richardson, Consulting Planner APPROVED BY: Debbie Pedro, AICP, Planning Director RECOMMENDATION That the Planning Commission: Forward a recommendation to the City Council to approve the requested modification and renewal of the Conditional Use Permit from 5 years to 10 years in compliance with Government Code Section 65964(b), subject to the conditions in Attachment 1. BACKGROUND The subject parcel is located at the Purissima Hills Water District water tank facility at 12863 La Cresta Drive. Verizon Wireless is the operator of this wireless communications facility which includes four existing pipe mount antennas with heights up to 15.9 feet. As part of this Use Permit renewal, the applicant is requesting to install two new panel antennas, one to an existing pipe and a second will have a new H -Frame pipe mount at the same height and size as the existing antennas. DISCUSSION Existing equipment within the _Verizon lease area includes one equipment shed of 396 square feet and four panel antennas located on pipe mount systems. All existing and proposed facilities do not exceed 15.9 feet in height. Mature landscaping exists along the perimeter of the site screening both the existing and proposed panel antennas from off site. The applicant is not requesting any modification to the site. The two new panel antennas will result in negligible additional visual impacts from off site. Pursuant to Government Code Section 65964(b), the conditions have been amended to allow the Conditional Use Permit to be valid for 10 years (currently five (5) years). Wireless Communications Facilities Policy The facility is consistent with the Town's Wireless Communications Facilities Policy. This is a non-residential site, and visual impacts are minimized by the location of the Staff Report to the Planning Commission Verizon CUP modification & renewal October 2, 2009 Page 2 antennas and the extensive landscape screening shielding the view of facility from residential properties. The Policy requires that a 3-5 year Master Plan be included with the application. A 3-5 year Master Plan showing existing Verizon facilities and the coverage in the Los Altos Hills and Los Altos area is included as Attachment 3. CONCLUSION The facility is operating in compliance with the approved conditions of the Use Permit, and the Wireless Communications Policy. The applicant has submitted a report demonstrating that the proposed facility will operate within Federal RF emissions standards and guidelines (Attachment 4). Extension of the Use Permit will allow continued operation of the facility for an additional ten (10) years at which time subsequent Planning Commission/City Council review will be required. ATTACHMENTS 1. Recommended amended conditions of approval 2. Applicant's statement requesting permit renewal 3. Verizon 3-5 Year Antenna Master Plan 4. Radio Frequency Emissions report by Hammett & Edison, dated May 28, 2009 5. Photo simulations showing existing site conditions and proposed site conditions 6. Site plans with details of proposed modifications Staff Report to the Planning Commission Verizon CUP modification & renewal October 2, 2009 Page 3 ATTACHMENT 1 RECOMMENDED CONDITIONS OF APPROVAL FOR A CONDITIONAL USE PERMIT RENEWAL AND MODIFICATION (VERIZON WIRELESS) 12863 LA CRESTA DRIVE, PURISSIMA HILLS WATER DISTRICT FILE# 120 -09 -CUP PLANNING: 1. Any changes or revisions to the telecommunications facility or its use shall require an amendment to the applicable conditional use permit(s). Additionally, the Planning Director may, at any time, schedule a review or revocation hearing before the Planning Commission regarding the use permit, if any condition of approval is not being met or the facility is being used inconsistently with the approved use or in violation of Town development codes. 2. The use permit shall expire ten (10) years from the date of approval. Renewal of the permit must be requested in writing, with appropriate fees, prior to the expiration date. 3. The applicant shall submit a signed agreement to the Town that should the use be discontinued by the carrier, all facilities will be removed not later than ninety (90) days after discontinuance of the use or abandonment. The agreement shall be approved by the City Attorney, and must be signed by the applicant and submitted to the Town prior to acceptance of plans for building plan check. 4. The applicant must obtain a building permit for the proposed antenna replacement. To reduce visual impacts, the 4' tall replacement antennas and all remaining antennas must be painted to match the existing antennas (dark gray) prior to final inspection. 5. AT&T Wireless or the operator of the site shall be responsible for repair or repainting of the proposed facilities (equipment shed, pipe mount) in case of vandalism or wear and must do so within 72 hours of notice by the Town that a complaint has been received. ENGINEERING: 6. Any, and all, changes to the proposed Site Plan shall first be approved by the Town Engineering Department. No grading shall take place during the grading moratorium (October 15 to April 15) except with prior approval from the City Engineer. No grading shall take place within ten feet of any property line. 7. Any, and all, areas on the project site that have the native material disturbed shall be protected for erosion control during the rainy season and shall be replanted prior to final inspection. APPLICANTS PROJECT SUPPORT STATEMENT LTE UPGRADE OF VERIZON WIRELESS SITE SITE NAME: Los ALTOS 12863 LA CRESTA DRIVE TOWN OF LOS ALTOS HILLS, CA SANTA CLARA COUNTY What is LTE? Attachment 2 LTE (or Long Term Evolution) represents the latest in wireless technology. Verizon Wireless has made a commitment to bring this 4th generation service to the Bay Area. LTE will vastly increase data speeds for wireless handsets and computers. The data speeds offered by LTE will be on par with DSL and cable internet speeds. As such, smaller wireless "hot spots" or isolated WiFi networks will become obsolete, as the entire Bay Area Verizon Wireless network will provide customers unprecedented data speeds for personal and business' uses. This network upgrade will also increase public safety by enabling users to access up to the minute news and traffic information. This Project The addition of LTE technology requires modification to each of Verizon Wireless' sites in the network. This project entails merely the installation of new antennas to accomplish the objective of bringing high speed capabilities to Verizon Wireless users in Town of Los Altos Hills Since the 2002, Verizon Wireless has maintained an installation at the existing water tank communications facility on La Cresta Drive. The Verizon Wireless facility consists of ground mounted antennas on 15' pole structures and a 12' x 20' shelter within a 16.5' x 24' walled compound. The antennas are connected by cables which run through the interior of the tower. -rW10 - Verizon Wireless would like to add thFee (2) panel antennas to tl4e existing pipe mounts at the same height as the existing antennas. There are no changes to the heights of the poles, and there will be little or no change to the visual aspect. PROJECT SUPPORT STATEMENT — LANDES & PIEDMONT Compliance with City Development and Landmark Commission Standards This upgrade is consistent with the Town of Los Altos Hills Conditional Use Permit Bulletin, dated November, 2004. Each criteria is addressed in turn as follows: 9. The proposed use or facility is properly located in relation to the community as a whole, land uses, and transportation and service facilities in the vicinity. This project involves collocation on an existing wireless facility. There are no changes to the heights of the poles, and there will be little or no change to the visual aspect. The proposed modification will not increase the burden on existing transportation, utilities and services in the vicinity. 2. The site for the proposed use is adequate in size and shape to accommodate this use and all yards, open spaces, walls and fences, parking, loading, landscaping and such other features as may be required by this chapter or will be need to assure that proposed use will be reasonably compatible with land uses normally permitted in the surrounding area. The proposed installation will not have any impact on the existing uses onsite. The proposed modification will not increase ground space requirements. 3. The site is served by streets and highways of adequate width and pavement to carry the quality and kind of traffic generated by this proposed use. The proposed modification will not increase traffic to the facility. 4. The site dies not adversely affect the abutting property or the permitted uses thereof. This project involves collocation on an existing wireless facility. There are no changes to the height of the pole, and there will be little or no change to the visual aspect. The proposed modification will not adversely affect other properties in the vicinity or the general welfare of the Town. Interference The project will not interfere with any TV, Radio, Telephone, Satellite, public safety communications or any other signals. Any interference would be against the Federal Law and would be a violation of Verizon Wireless' FCC License. Notices of Actions Affecting this Development Permit In accordance with California Government Code Section 65945(a), Verizon Wireless requests notice of any proposal to adopt or amend the: general plan, specific -plan, zoning ordinance, ordinance(s) affecting building or grading permits that would in any manner affect this development permit. Any such notice may be sent to 2009 V Street, Sacramento, CA 95818. Construction Schedule The construction of the facility will be in compliance with all local rules and regulations. The typical duration is less than one month. The crew size will range from approximately 2 to 10 individuals. Page 2 of 2 Town of Los Altos Hills Antenna Master Plan ma w CD a W—W Attachment 4 Verizon Wireless • Base Station No. 116627 "Los Altos" 12863 Cresta Drive • Los Altos Hills, California Statement of Hammett & Edison, Inc., Consulting Engineers The firm of Hammett & Edison, Inc., Consulting Engineers, has been retained on behalf of Verizon Wireless, a personal wireless telecommunications carrier, to evaluate proposed modifications to its existing base station (Site No. 116627 "Los Altos") located at 12863 Cresta Drive in Los Altos Hills, 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 2.33 0.47 [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 HAmmm & EDISON, INC. VW116627596 CONSULTING ENGINEERS Page 1 Of 4 SAN FRANCISCO Verizon Wireless v Base Station No. 116627 "Los Altos" 12863 Cresta Drive • Los Altos Hills, 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 on information provided by Verizon Wireless, including drawings by MST Architects, dated May 6, 2009, that carrier presently has installed four directional antennas, two each for PCS and cellular service, on short poles adjacent to two water tanks located at 12863 Cresta Drive in Los Altos Hills, California. Verizon proposes to mount two new Andrew Model LNX-6512DS-VTM directional LTE antennas alongside the existing configuration, with all the antennas mounted at an effective height of about 131/2 feet above ground and oriented in groups of three (one of each model) toward 5°T and 200°T, away from the water tanks. The maximum effective radiated power in any direction for the proposed new LTE installation would be 400 watts. Presently located nearby are similar antennas for use by Sprint Nextel and T -Mobile, other wireless telecommunication carriers, as well as an omnidirectional antenna on top of a lattice tower in unknown service. This site was visited by Mr. Weston Lane, a qualified employee of Hammett & Edison, Inc., during normal business hours on August 24, 2006, a non -holiday weekday. The maximum power density level observed for a person anywhere at any -ground near the site was 15% of the applicable public limit. The three-dimensional perimeter of RF power density equal to the FCC standard for uncontrolled areas did not extend into any uncontrolled areas. The measurement equipment used was HAmmETT & EDISON, INC. VW116627596 CONSULTING ENGINEERS SAN FRANCISCO Page 2 of 4 Verizon Wireless • Base Station No. 116627 "Los Altos" 12663 Cresta Drive • Los Altos Hills, California a Wandel & Goltermann Type EMR -300 Radiation Meter with Type 25 Isotropic Electric Field Probe (Serial No. E-0001). Both meter and probe were undercurrent calibration by the manufacturer. Study Results For a person ariywhere at ground, the maximum ambient RF exposure level due to the proposed Verizon LTE operation by itself is calculated to be 0.0065 mW/cm2, which is 13% of the applicable public limit; cumulative levels at ground are therefore expected to be below 28% of the public limit. It should be noted that these results include several "worst-case" assumptions and therefore are expected to overstate actual power density levels. Recommended Mitigation Measures Due to their mounting locations, the Verizon antennas would not be accessible to the general public, and so no mitigation measures are necessary to comply with the FCC public exposure guidelines. To prevent occupational exposures in excess of the FCC guidelines, no access in front of the Verizon antennas themselves, such as might occur during maintenance activities, should be allowed while the site is in operation, unless other measures can be demonstrated to ensure that occupational protection requirements are met. Posting explanatory warning signs* on the antennas, such that the signs would be readily visible from any angle of approach to persons who might need to work near the antennas, would be sufficient to meet FCC -adopted guidelines. Similar measures should already be in place for the other carriers at the site; applicable keep -back distances have not been determined as part of this study. Conclusion Based on the information and analysis above, it is the undersigned's professional opinion that the Verizon Wireless base station located at 12863 Cresta Drive in Los Altos Hills, 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. Posting of explanatory signs is recommended to establish compliance by Verizon Wireless with occupational exposure limitations. * Warning signs should comply with OET-65 color, symbol, and content recommendations. Contact information should be provided (e.g., a telephone number) to arrange for access to restricted areas. The selection of language(s) is not an engineering matter, and guidance from the landlord, local zoning or health authority, or appropriate professionals may be required. HAMMETT & EDISON, INC. VW116627596 CONSULTING ENGINEERS Page 3 of 4 SAN FRANCISCO Verizon Wireless • Base Station No. 116627 "Los Altos" 12863 Cresta Drive • Los Altos Hills, California 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 supplied by others, which data he believes to be correct. May 28, 2009 HAMMETT & EDISON, INC. VW116627596 CONSULTING ENGINEERS SAN FRANCISCO Page 4 of 4 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 r.Cn 0 0.1 Electromagnetic 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 1.63 100 100 614 823.8/f 1.63 2.191f 100 1801f- 1842/ f 823.8/f 4.89/ f 2.19/f 900/ f' 180// 61.4 27.5 0.163 0.0729 1.0 0.2 3.541h 1.59ff ff/106 4f 1238 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 10 100 103 104 105 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. HAMMETT & EDISON, INC. FCC Guidelines CONSULTING ENGINEERS .. Figure 1 SAN FRANCISCO RFRZ 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 mW/cm2, BBW zxD xh and for an aperture antenna, maximum power density Smax = x h2 0.1x16x77xPnet , 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 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: 2.56 x 1.64 x 100 x RFF2 x ERP power density S = in mw/cm2, 4x,7txD2 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. HAMMETT & EDISON, INC. CONSULTING ENGINEERS Methodology SAN FRANCISCO Figure 2 May 25, 2009 Photosimulation of view looking northeast from Hwy 280. �,j 4opyngnt cuua, rrevisuausts mc., ail ngnts reserved. 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