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HomeMy WebLinkAbout4.3 "•� .3 TOWN OF LOS ALTOS HILLS June 14, 1995 Staff Report to the Planning Commission • RE: REQUEST FOR CONDITIONAL USE PERMIT,SITE DEVELOPMENT AND ZONING PERMIT FOR;CONSTRUCTION AND OPERATION OF AN UNMANNED COMMUNICATIONS FACILITY;NEXTEL COMMUNICATIONS,INC (LANDS OF FENWICK);28011 ELENA ROAD. .; FROM: Suzanne Davis, Planner SD . RECOMMENDATION: That the Planning.Commission: Forward the application to the City Council with a recommendation for approval of the requested Conditional.Use,Site Development and Zoning Permits,subject to the attachedfindings and conditions of approval.; BACKGROUND The Planning Commission considered a request from Nextel Communications to locate a facility at 2250 Old Page Mill Road (Gerth Lane) in September 1994. At that time several concerns were raised,including the visibility of the facility, potential health risks,possibility of interference with local cable and other utilities,and whether the use is a commercial enterprise and should be allowed in the Town. Following the Planning Commission meeting, the City Attorney reviewed information submitted by the applicant and determined that since Nextel facilities are not regulated by the Public Utilities Commission (PUC) the use did not fall under the category of"public utility", and might not be allowed. The applicant presented information to the Town from other agencies which have approved Nextel facilities,and subsequently went to the City Council for an interpretation on the code. The Council decided that Nextel does provide a public service, and therefore has the right to apply for a Conditional Use Permit under Subsection 10-1.703(h) of the Zoning Ordinance (public utility and service uses). The Nextel facility could also be of use to the Town for emergency broadcasting. DISCUSSION The applicant is requesting approval of a Conditional Use Permit to allow a communications facility to be located on a private,property located at 28011 Elena Road. The 42 acre property is owned by Mr. &Mrs. Fenwick,whose residence is located on an adjacent parcel to the west. There are two other Planning Commission June 14, 199 Nextel (Lands of Fenwick Page 2 residences located on pro erties to the south and north. The east side of the property is bounded by In erstate 280. Nextel Communications has made arrangements with the Fe wicks to lease a small area on their property to locate an underground storage vkult and four panel antennas. The facility would be unmanned, and would require minimal on-site maintenance (see Attachment 3). Photographs of the site wi l be available at the Planning Commission meeting. Nextel has made efforts to address the concerns which were raised at the September 14, 1994,Pla ng Commission hearing on their previous proposal. The equipment will be in n underground vault,with only two feet of the structure raised above gro nd. The cover which will be exposed will be painted to blend in with the site. he antennas will be only 1,0 feet in height, and will also be painted to blend in wit the surroundings. The antennas will be placed in an area where the Fenwicks lave an existing Ham radio antenna. The Town has not received any complaints from neighbors about the existing antenna. The facility will not interfere with neighbors cable t.v. or radio reception. The facility does not present airy health ris Is as discussed in a report on the evaluation of radio frequency exposure condifons (see Attachment 4). The report states that Nextel facility will comply with t e prevailing standards for limiting human exposure to radio frequency energy, a d that there will not be any significant effects on the environment. The propos d Nextel facility will be less of an impact visually than the two cell sites on Puriss ma Road because the antennas will be lower, there will not be an above grow d building and the site is so well screened. The Cellular One facility o Purissima Road is the last use permit approved for a communications facility. ellular One's use permit was approved for a three year period. At the end of that time an application for extension of the use will be re-reviewed by the Pla 'ng Commission. The Commission will determine if modifications are necessar and if the Conditional Use Permit can be approved for another specified time rame. Cellular One conditions included provisions for monitoring to ensure t at emissions are safe and remain consistent with safety standards as they a dress exposure to the public. Monitoring and reporting to the Town was to be accomplished at the installation of the facility, and once a year for three y ars. If problems are noted, staff or the Commission may agendize the matter f q r review along with the Conditional Use Permit at a public hearing. Staff is als to make random inspections of the property to ensure that the required m intenance is being accomplished to the satisfaction of the Town. Staff recomme s that these same provisions be part of the use permit for the Nextel facility. The Environmental Design& Protection Committee recommends that the proposed improvements b at least 15 feet from any existing trees. If any trenching will be done, care should be taken so that no water be directed towards Planning Commission June 14, 1995 Nextel (Lands of Fenwick) Page 3 the root crown of the Oaks. Recommended colors for the antennas are gray- green or medium brown,to reduce visibility. The Fire Department reviewed the plans and has no recommendations. In order to approve the requested Conditional Use Permit for the proposed communications facility,the Commission needs to make the findings as set forth in Section 10-1.1107(1)of the Town of Losl.Altos Hills Zoning Ordinance for the granting of a conditional use permit. The;findings in Attachment 1 are proposed for the Commission's review. The project is in conformance with the standards set forth in the Zoning and Site Development Ordinances.. Staff recommends that the Planning Commission review the plans and supplemental information, and approve the requested Conditional Use,Site Development and Zoning Permits, subject to the conditions of approval in Attachment 2. Representatives from Nextel will be available to answer any questionsthat any member of'the.Commission or the community may have. ATTACHMENTS: 1. Recommended findings for Conditional Use Permit 2. Recommended conditions of approval 3. Applicant's project description (four pages) , 4. Hammett&Edison Report dated June.29, 1994. 5. Development Plans: site plan and details (five sheets) cc: . Laura Albright. . Smart SMR of California,Inc. 475 Fourteenth Street,Suite 300 Oakland,CA,94612 ... . { Robert&Janet Fenwick 28011 Elena Road Los Altos Hills,CA 94022 - Planning Coimmission June 14, 199 Nextel (Lands of Fenwick Page 4 RECOMMENDED FINDINGS FOR CONDITIONAL USE PERMIT - FO COMMUNICATIONS FACILITY NEXTEL COMMUNICA ONS (LANDS OF FENWICK) -28011 ELENA ROAD 1. The proposed use o facility is properly located in relation to the community as a w ole, land uses, and transportation and service facilities in the vic nity. The existing undev loped property with an existing radio antenna provides a compati le location for the proposed communications facility. This use blends we 1 with the existing character of the site without adversely impactin the single family residencl es in the area. In addition the sie is well scre ned from the surrounding residential uses by the existi g vegetation, and additional landscape planting will be done to ensure that the faci ity is screened from off-site views. One side of the property is abutted by a freeway,the project site is in the middle of an unde'eloped 42 ace parcel, and it will be located as far from adjoining resideHces as possi le. The facility needs only four relatively low and unobt usive antenn s,and does not require any other large equipment or structures. Since it s an unmanned facility,no traffic will be generated and there will be n additional demands on service facilities in the vicinity. The neces ary utilities,telephone and electric service,are available at the site nd the project site has easy access off Elena Road. 2. The site for the pro osed use is adequate in size and shape to accommodate the p oposed use and all yards, open spaces, walls and fences parking, boa ing, landscaping, and such other features as may be required by the Zo ing Ordinance, or in the opinion of the Planning Commission, will b needed to assure that the proposed use will be reasonably compat ble with land uses normally permitted in the surroinding area. . The proposed instal ation requires only a minimal amount of space, and no large antennas o equipment are being proposed. The site is more..than adequ to in size an shape to accommodate the communications facility. The equipment will be primarily underground, and the panel antennas will be low to the g ound. The antennas will be painted to blend in with the sui.roundings a d additional landscaping will be added to screen them from :ff-site views. Planning Commission June 14, 1995 Nextel (Lands of Fenwick) Page 5 3. The site for the proposed use willkm served by streets and highways of adequate width and pavement to carry the quantity and kind of traffic generated by'the proposed use. . . There will be no traffic related issues with the project because virtually no traffic will be created. Routine maintenance occurs one to two times per month,via a light-duty utility vehicle. Road access to the site from Elena Road is adequate for this use. An unpaved road from the Fenwick driveway to the antenna site will complete,the on-site access. 4. The proposed use will not adversely affect the abutting property or the permitted use thereof The proposed use will have very little impact on adjacent properties or uses. The facility will be a significant distance from neighboring residences. The improvements and antennas will not have a visual impact, and will be adequately screened by the existing trees and shrubs, and new landscaping as needed. Environmental impacts of the facility will be negligible. The facility produces no odors,noise,or hazards. No interference with radio,television,or other telecommunications activities on abutting properties or in the vicinity would occur. There would be no adverse effect on the adjacent properties and/or uses. No health hazards have been identified in association with this type of facility. (Hammett& Edison,Inc. report dated June 29,;1994,on file with the Town of Los Altos Hills). . . . • • Planning Commission June 14, 1995 Nextel (Lands of Fenwick) Page 6 RECOMMEN ED CONDITIONS OF APPROVAL FOR, CONDITIONAL USE PERMIT; SITE DEVELOPMENT PERMIT AND ZONING PERMIT FOR COMMUNICATIONS FACILITY NEXTEL COMMUNICATIONS (LANDS OF FENWICK) -28011 ELENA ROAD A. PLANNING DEPARTMENT: 1. Any changes 9r modifications to the approved plans shall be approved by t e Planning Director or the Planning Commission, depending up.n the scope of the change's. 2. Paint colors fog the top of the equipment vault and the panel antennas shall be earth tone colors chosen by the applicant and approved by s aff in conformance with the Town's adopted color board. 3. Prior to final 'i spection and release of final building permits a landscape pla ting plan must be submitted to and approved by the Site Develop ent Committee. The landscape plan shall take into consideration .dequate screening of the antennas. All planting required for litigation screening that does not establish itself 4ithin eight () months,shall be replaced. A$5000.00 landscape deposit shall be posted prior to final inspection. Required plantings *411 M ��Q,+� shall be installed within six months. 50% of the deposit shall be �e �" returned one year after the date of the inspection to ensure adequate esta lishment and maintenance. The remainder will be released one y ar later if the plantings remain viable. 4. Prior to begi 'ng any grading or construction, all significant trees in the project ea are to be fenced at the dripline. The fencing shall I e of a materia and structure to clearly delineate the dripline. Town staff must inspect the fencing and the trees to be fenced prior to commencement of grading. The fencing must remain throughout the course of construction. No storage of equipment, viehicles or de•ris shall be allowed within the driplines of these trees. Care sh.l1 be taken to not divert any water towards the root crown of any of the Oak trees in the vicinity. • { Planning Commission June 14, 1995 Nextel (Lands of Fenwick) Page 7 5. This approval will remain in effect for three (3).years. At that time an application for_extensio4i of the use permit shall be re-reviewed by the Planning Commission for determination of any needed modifications and for approval to continue the operation of the facility. Monitoring shall ensure that emissions.are safe and remain consistent with safety standards as they address exposure to the public. 6. In the event that any of the conditions of this permit are not satisfied,the Planning Department may cause a noticed public hearing.to besentto review whether the permit should be continued;and upon a showing of compelling public necessity demonstrated at the noticed public hearing, the Town may add, amend,or delete conditions and regulations contained in this permit. 7. Monitoring and reporting to the Town shall be accomplished at the installation of the facility and once a year for three years. The reports shall be forwarded to the Planning Commission for their information and review. If problems are noted,staff or the Commission may agendize the report for review along with the Conditional Use Permit at a public hearing. 8. Maintenance of the equipment, antennas and the grounds, including weed abatement and maintenance of the facility is required to be accomplished on an on-going basis. The Town shall make random inspections of the property to ensure that the required maintenance is being accomplished to the satisfaction of the Town of Los Altos Hills. B. ENGINEERING DEPARTMENT:; 9. The property owner shall inform the Town of any damage and shall repair any damage caused by the construction of the project to pathways,private driveways,public and private roadways prior to final inspection and release of occupancy permits and shall provide the Town with photographs of the existing conditions of the roadways and pathways prior to acceptance of plans for building plan check. 10. Any areas on the site that have had the native soil disturbed shall be protected for erosion control during the rainy season and shall be replanted prior to final inspection. Planning Commission June 14, 1995 Nextel (Lands of Fenwick) Page 8 11. . Any and all ci anges to the approved grading plan must first be approved by he Town Engineering Department. No grading shall take place dui ing the grading moratorium (November 1 to April 1) except with •rior approval from the City Engineer. No grading shall take pla a within ten feet of any property line. 12. Upon compl tion of the construction, a final inspection shall be required to b set with the Town Planner and the City Engineer two weeks prior t final building inspection approval. CONDITION NUMBER 9 SHALL BE COMPLETED AND SIGNED OFF BY THE ENGIN ERING DE ARTMENT PRIOR TO ACCEPTANCE OF CONSTRUC ION PLAN FOR PLAN CHECK BY THE BUILDING DEPARTMENT. ALL OT ER CONDITIONS MUST BE SATISFIED PRIOR TO FINAL INSPECTION. PROTECTIVE TREE FEN I ING SHALL BE INSPECTED BY THE PLANNING DEPARTMENT PRIOR T•• ISSUANCE OF ANY BUILDING,PERMITS. NOTE: The Site Developm-nt permit is valid for one year from the approval date (until June 14,1996). • 1 required building permits must be obtained within that year. M s....a. `.. Town of Los Altos Hills - Use Permit Application Project Description Applicant's Objective To amend Use Permit Application #109-94-CUP's on file to obtain a use permit to establish a communications facility at 28011 Elena Road;,on APN: 182-02-016 in a Residential Agricultural (RA) zone. i Project Description and the Nextel System Smart SMR of California, Inc.; a wholly owned subsidiary of Nextel Communications ("Nextel"), has been authorized by the Federal Communications Commission ("FCC") to construct and operate the first multi-purpose:digital mobile radio system in the United States. This communications system will be offered to local police, fire and local agencies as well as to the general public. 1 In order to provide clear, consistent mobile communications service to Highway 280 and the surrounding area, Nextel proposes to construct and operate an unmanned specialized mobile radio facility at 28011 Elena Road in Los Altos Hills on APN: 182-02-016. The proposed facility will consist of a 10 ft. x 16 ft. vault equipment building and four (4) panel/directional. The proposed Los Altos Hills site will be part of the Enhanced Specialized Mobile Radio system for Northern California. The current system consists of approximately 100 base stations with a switching office located in.Oakland: * The fully digital mobile communications system being constructed by Nextel will operate in the 806 to 866 Megahertz frequency band at 00 watts per channel. Nextel is licensed by the FCC to operate specifically within this frequency band thereby eliminating any potential interference with other radio or television transmission or reception in this area. At the prescribed power level of 100 watts per channel, there will be no health risks associated with this type of radio 'transmission:1 .A power density study dated June 29, 1994 prepared by Hammett&Edison was submitted with Application#109-94-CUP. The Los Altos Hills site will provide mobile communications coverage along Highway 280 and in the surrounding area. This facility will consist of the following: Los Altos Hills NELT= Page 2 1. A 10 ft. x 16 ft. (160 sq. ft.) vault equipment shelter used to house the necessary electronic equipment; an. 2. An antennaconfiguratio that'will consist of four (4) panel/directional antennas in two (2) s ctors. The sei tor facing south will have an overall height of eight (8) feet abov ground level. The north facing sector will have an overall height of 12 feet above ground level. The equipment s elter will be prefabricated underground vault structure which will extend approximately two (2) fe-t above the ground. The ectending section of the vault will consist of aent for the ai conditioner and the access. Approximately 180 cubic yards of soil willIbe-removed t• install the vault,_and will be placed in a location to be. determined. All ntennas will b; made of non-reflective materials.and will be painted to, blend into the su oundings. The facility will b visited appro imately oneto two times per month by a technician for routine maintenance. Environmental Se:tin. and Ad'ac-nt Pro.ert Uses. . The subject parce is approximat-ly 42 acres and is owned by Robert and Janet Fenwick and is vacant. C rrently, the Fe,wick's have a 46 ft. retractable Ham radio antenna near the proposed loca ions of the N:xtel antennas. To-the west is another parcel owned by the Fenwick's wlich contains th-ir residence. To the south and north are single-family residentialro a ties. .To the ea.t is Highway 280. Plant and. animal life on site include, P P, those which are natural to the arra and will not be disturbed. Findings Required for Approval 1. The proposed use has been s.ecifically designed to blend(well with the existing parcel without adversely impacting t. The equipment shelter will be an underground vault. Approximatel4 two (2) feet o the shelter consisting of the air conditioner vent and the access door Will extend ab.ve the ground and 'will be painted to blend into the surroundings. The antennas will be placed among_the existing oak trees and will be painted to bleil d into the surr•undings. Additional landscaping may be added to aid in G:\SITES\ZONING\665H1PROJUST.DOC I • Los Altos Hills Page 3 the disguising of the facility. The facility will not be visible from any of the surrounding residential properties. Since the proposed site is an unmanned facility, it would not generate traffic nor place additional demands on service.facilities in the vicinity. The proposed site has easy access off Elena Road. 2. The proposed installation requires only a minimal amount of space, and the proposed locations of the shelter and the antennas are adequate in size and shape to accommodate the use. 3. There will be no traffic related issues with Nextel's proposed facility because virtually no traffic will be created. Routine maintenance occurs approximately one to two times per month via a light-duty utility vehicle. Road access to the site from Elena road is adequate. Nextel will install a 25 ft. long access drive from the Fenwick's driveway to the shelter area for parking of the maintenance vehicle. 4. The proposed use will have very little impact on adjacent properties or uses. The proposed site will be located in the middle of a 42 acre parcel, far away from the neighboring residences. The facility will have no visual due to the existing vegetation and topography of the parcel. The Nextel facility will result in no significant impacts to the environment or to the surrounding area. The facility produces no noise, smoke, odors, or hazards. No interference with radio, television, or other telecommunications activities on abutting properties or in the vicinity would occur. There would be no adverse effects on the adjacent properties and/or uses. County and Utility Services This facility is unmanned and will not require the use of any county services such as water, sewer, police, fire, etc. Electric power and telephone service are the only necessary utilities and both are available at the subject site G:\SITES\ZONING\66511\PROD U ST.DOC . . 1 NE17.=,,, ,a,,4.,„,, . Los Altos Hills Page 4 Conclusion - The proposed del elopment at t e subject site will be such that the locations, size, design and operating c aracteristics w 11 be compatible with and will not adversely affect the livability or ap ropriate deve opment of abutting properties and the surrounding neighborhood. extel's propo.ed use will not be materially detrimental to the use, enjoyment, or valuation of prop;rty of other persons located in the vicinity of the site, nor will it represent a unique or unu ual visual product. In addition, the proposed facility will - not require any c o unty or city se ices and will remain unmanned requiring only infrequent maintenance visit (approximat:ly 20 per year) and will thereby maintain a low-profile presence in the c•mmunity. • G:\SITES\ZONING\665H PROJUST.DOC • Nextel Communications Stanford Cellular Site Los Altos Hills, California Evaluation of Radio Frequency Exposure Conditions June 29, 1994 ©1994 All rights reserved. HEHAMMETT&EDISON,INC.. CONSULTING ENGINEERS SAN FRANCISCO r 1 Nextel Communictions •• Stanford Site •• Los Altos Hills, California Statement ofilliam F. Hammett, Consulting Engineer lifil The firm of Hammett & Edis n, Inc., Consulting Engineers, has been retained by Nextel Communications to evaluate the c•llular telephone site proposed to be located at 2285 Gerth Lane, Los Altos Hills, California, for co pliance with appropriate guidelines for limiting human exposure to radio frequency electromagnetic fields. Pr=vailing Exposure Standards In General Docket 79-144, the F:deral Communications Commission adopted the radio frequency protection guide or the Americ•n National Standards Institute Standard C95.1-1982, "Safety Levels with Respeclt to Human E posure to Radio Frequency Electromagnetic Fields, 300 kHz to 100 GHz." The effective date fo applying this standard to FCC licensees was January 1, 1986, and a summary of the limits of t e ANSI Standard ("ANSI") is shown in Figure 1A. The most restrictive limit aprilies at freque cies between 30 and 300 MHz, where FM and VHF television stations operate; the limit is highe at UHF and cellular frequencies, as shown. The exposures are to be averaged over some inter al of time (six minutes in C95.1-1982), as it is the rate of absorption of radio frequency ("'F") energy that ANSI is limiting, rather than the peak exposure at any one moment. In 1992, the American National S andards Institute published ANSI/IEEE Standard C95.1-1992, a summary of which s shown in Figure 1B. This revision of C95.1-1982 defines "controlled" and "uncontrolled" environments, set ing for the latter more restrictive exposure limits but longer periods for time averaging. Alth ugh there are a number of changes from the 1982 Standard, the controlled (i.e., occupational) lim is are approximately the same, while uncontrolled (i.e., public) limits are generally ive times mo - restrictive. Although the FCC rias not yet acted on its expected adoption of the revised standard, the most restrictive criteria of either standa d are used in this report to evaluate the exposure conditions at the proposed cellular site. The li it for continuous exposure io RF energy at 851 MHz, the lowest frequency assigned for cellular base station use, is 2.84 mW/cm2 (milliwatts per square centimeter) for occupational ex.osure situations and 0.567 mW/cm2 (equal to 567 µW/cm2, microwatts per square centimeter) for public exposure situations. Computer Modeling Method The FCC has provided direction o the telecommunications industry on determining compliance with ANSI in the Office of Scicnct and Technology Bulletin No. 65, "Evaluating Compliance With FCC-Specified Guidielines for Human Exposure to Radiofrequency Radiation," dated October 1985. HEHAMMETT& EDISON, INC. 940629.1 CONSULTING ENGINEERS SAN FRANCISCO Page 1 of 3 Nextel Communications • Stanford Site • Los Altos Hills, California We have developed computerized techniques for applying the formulas given in that Bulletin to calculate both ground level and on-tower power densities at radio transmitting sites. The attached Figure 3 describes the ground level calculation 'methodology in detail. This method of evaluating expected exposure conditions is accepted by the FCC, and its accuracy has been verified by numerous field tests. Site and Facility Description It is proposed to install a new cellular facility at the rear of the residential property at 2285 Gerth Lane, Los Altos Hills, California. The site is on a knoll overlooking sections of Los Altos Hills as well as a good distance of Highway 280 in both directions of the Page Mill Road exit; the suitability of the cell site was verified by my personal observation on June 9, 1994. It is proposed to install three omnidirectional antennas on a 36-foot wooden pole, such that the effective height of the antennas is 44 feet above ground. Only one antenna of the triplet is used for transmission of four communications data channels to mobile and handheld receivers, and the other two are used for reception of the return signals. Data for the proposed antenna height, antenna type and orientation, and effective radiated; power have been supplied by Nextel and are summarized in Figure 2A. It is my understanding that Nextel may eventually configure the site in "sectors," operating with panel antennas oriented in different directions in order to increase the capacity of the site; antennas that would used in such a situation are also included on Figure 2A. Cellular Facility Requirements Because of the short wavelength of the frequencies assigned for cellular use, the antennas require line-of-sight paths for their signals to propagate. Therefore, they will necessarily be mounted above nearby buildings, terrain, and vegetation; the energy directed toward any accessible location nearby will be limited by the narrow beamwidth of the elevation pattern, as shown in Figure 2B. When an additional cell site is added to anexistingcellular network, as is the case with the proposed Stanford site, the operating powers of the surrounding cells are reduced and the power of the new site is itself low, in order not to create interference with nearby cells, which will re-use the same frequencies. Because of the low power alone, it is generally not possible for exposure conditions to approach the ANSI limits without being physically very near the antennas. Study Results For the specific parameters of the proposed Stanford site, I have calculated the highest possible power densities resulting from the operation, assuming its eventual configuration as a worst case. • HEHAMMETT& EDISON,INC. 940629 CONSULTING ENGINEERS SAN FRANCISCO Page 2 of 3 . Nextel Communic 0 tions • Stanford Site • Los Altos Hills, California The land in three directions from the site is undeveloped, so approaches other than to the base of the proposed facility are unlikely. Nevertheless, the wholearea around the site has been modeled to determine the ca culated levels of RF power density at all possible areas of human exposure. As shown on Figurz 4A, the calc lated RF power density at ground level is everywhere less than I% of the most restrictive ANSI I mit. As shown on Figure 4B, the highest calculated levels occur near the base of the pole, at less t an half of one percent of ANSI, and at the top of the ridge about 250 feet north of tl-e site, at just over half of one percent. RF power density on the pole itself is calculated to be below ANSI for h-ights not exceeding 20 feet above ground. Conclusion Based on the information and ana ysis above, it is my professional opinion that the Nextel cellular telephone facility pgoposed to be located at 2285 Gerth Lane, Los Altos Hills, will comply with the prevailing standard for limiting h man exposure to radio frequency energy and, therefore, will not cause for this reason a significant impact on the environment. Calculations indicate that all human exposure, other that by workers .n the pole supporting the antennas,, meets the ANSI exposure guidelines by an additional safet, factor of at least 170 times. This finding is consistent with measurements of antual exposur= conditions taken at operating cell sites, where power density levels are typically ess than 1% oi the prevailing standards. List of Figures In carrying out these engineering studies, the following attached figures were prepared under my direct supervision: L Summary of A SI C95.1-19:,2 and C95.1-1992 Standards 2. Technical specifications of p oposed operation 3. RFR.GROUND calculation Methodology 4. Map of calculated RF power densities. Qs #Ai 4` '� ♦ e William F. Hammett, P.E. E-1302• re, June 29, 1994 u�', 3 �A•2067 2 . ii•sto * itt FtFC I 1 . `rho ECHAH F�Q�\P . OF CA I HAMMETT& EDIS N,INC. ' 940629 CONSULTING ENGINEERS IIC SAN FRANCISCO Page 3 0l'3 , Affidavit State of California ss: County of San Mateo William F. Hammett, being first duly sworn upon oath, deposes and says: 1. That he is a qualified Registered Professional Engineer, holds California Registrations Nos. E-013026 and M-020676, which:expire on June 30, 1997, and is a principal in the firm of Hammett & Edison, Inc., Consulting 'Engineers, with offices located near the city of San Francisco, California, 2. That he graduated from Dartmouth College'with a degree in Engineering Sciences in 1977 and from the University of Illinois with a degre 'of Master of Science in 1978, has completed two years of employment by the Standard Oil Company and five years by Dean Witter Reynolds in various engineering, computer, and management capacities, and has been associated with the firm of Hammett & Edison, Inc., since 1985, 3. That the firm of Hammett & Edison, Inc., Consulting Engineers, has been retained by Nextel Communications to evaluate the cellular telephone site proposed to be located at 2285 Gerth Lane, Los Altos Hills, California, for compliance with appropriate guidelines for limiting human exposure to radio frequency electromagnetic fields, 4. That such engineering work has been carried out by him or under his direction and that the results thereof are attached hereto and form a part of this affidavit, and 5. That the foregoing statement and the report regarding the aforementioned engineering work are true and correct of his own knowledge except such statements made therein on information and belief and, as to such statements, he believes them to be true. William F. Hammett, P.E. Subscribed and sworn to before me this 29th day of June, 1994 ORIGINAL COPY NOTARIZED H HAMMETT& EDISON, INC. 940629 CONSULTING IiNGINI'sGRS Affidavit SAN FRANCISCO Nextel Communications • Stanford Site • Los Altos Hills, California A SI C95.1-1982 Radio Frequency Protection Guide Frequency Electric Field Magnetic Field Equivalent Far-field Rang Squared Squared Power Density (MHz (V2/m2) (A2/m2) (mW/cm2) 0.3- 3 400,000 2.5 100 3 - 30" . 4,000 x (900/P) 0.025 x (900/f2) 900/f2 30 - 300 4,000 0.025 1.0 300 - 1,500 4,000 x (f/300) 0.025 x (f/300) f/300 1,500 - 100,000 . 20,000 0.125 5.0 Note: f= frequency (MHz) 10 • 100 10- T Ca 10 — 900 5., 1 f 1 -- 300 0.1 I I II3 4 5 0.1 1 10 102 10 10 10 Frequency (MHz) ,i FIEHAMMETT& EDISON, INC. 940629 CONSULTING ENGINEERS SAN FRANCISCO Figure 1 A I ' Nextel Communications.• Stanford Site • Los Altos Hills, California ANSI/IEEE C95.1-1992 Radio Frequency Protection Guide Frequency Equivalent Far-Field Range Electric Field Magnetic Field Power Density (MHz) (V/m) (A/m) (mW/cm2) 0.003-0.1 614 614 163 163 0.1 - 1.34 614 614 163/f 16.3/f 1.34-3.0 614 823.8/f 163/f 16.3/f 3.0-30 1842/f 823.8/f 16.3/f 16.3/f t 66� 30- 100 61.4 27.5 16.3/f 158.3/f 100-300 61.4 27.5 0. 163 0.0729 1.0 0.2 300-3,000 f/300 f/1500 3,000- 15,000 10 f/1500 15,000-300,000 10 10 Note: f= frequency (MHz) Controlled Enviri nments Uncontrolled Environments ---- i I 106 105 H-Field Power 104 \\\_„....0.0„......"H-Field Density 103 (mW/cm 2) 100 E-Field ` • 10 ��` ..- • \_ \.--_..,' > 100 ,I.- Body / 10 ' i , Current // j (mA) 1 . I I I 1 1 I I I I 0.01 0.1 1 10 100 101 101 10` Frequency (MHz) I H HAMMETT& EDISON, INC. 940G29 CONSULTING 1'sNGwIiGRS Figure I B SAN FRANCISCO . Nextel Communic tions • Stanford Site • Los Altos Hills, California Technical pecifications of Proposed Operation A. Site North Latitude 37° 23' 44" West Longitude 122° 10' 01" (192T North Ameri an datum) 2285 Gerth Lane, L s.:Altos Hills, California B. Antennas Initial Configuration: Transmit antenna ecibel Products, Type DB810 whip one Receive antennas Decibel Products, Type DB810 whip two Eventual Configuration: Transmit antenna Dlecibel Products, Type DB874 panel one per sector Receive antennas Decibel Products, Type DB874 panel two per sector C. Height Height of site above mean sea level 400 ft Effective height of anten as above site 44 ft Effective height of anten as above mean sea level 444 ft D. Operation Initial Con(figuration: Antenna pbwer gain 10.0 dBd Maximum effective radia ed power, per channel 100 W Number of channels four Maximum effective radia ed power, total i 400 W Eventual Configuration: Antenna power gain 11.3 dBd Maximum effective radiated power, per channel per sector 135 W Number of channels four Maximum effective radiated power, total per sector 540 W •HAMMETT& EDISON, INC. 940629 H coNsuI:nNc� IiNI INF.t:RS Figure 2A SAN FRANCISCO Nextel Communications • Stanford Site.• Los Altos Hills, California Antenna Radiation Pattern r ar, . +SQD . iiiiiimilitir -ti / '. ,. J.N.xfs +3DO . .6 / Xill A I .. irrif%xi. . .-d Akk .N 101111Plp aili ft! - *at 4.0qtri 41.7111 • -40 .1 ' libps-1.4=27:1701::0.millifitoa- -'2:Zkv, - "7 :.#- . _ -l0 - �.inalli'b 15 O . Is *.- N% -%."‘". . mak a 1 .11$111147 . .Ilo . . 111 :. \?..Pl" . , jig - "IIIIIF ammil 30° 144‘ ailliallill ---Alli —6o0 Elevation Plane (view from the side) 1 Data supplied by manufacturer. }3 t HAMMETT& EDISON, I INC. 940629 i % CONSULTING I.NGIN1EI?RS I'I�40ure 2f3 SAN FRANCISCO RFR.GROUNDTM Calculation Methodology Determination by Computer of ANSI Compliance. Conditions The U.S. ongress has required of the FCC that it evaluate its actions for possible significant impact n•the environment. In General Docker79-144, the FCC adopted the American National Standard Institute Standard C95.1-1982, "American National Standard Safety Levels with Respect to uman Exposure to Radio Frequency Electromagnetic Fields, 300 kHz to 100 GHz." The guidelines in this Standard are now applicable to all FCC-licensed broadcast stations. The most restrictive guideline is 1 mW/cm2, applying at FM and VHF television frequencies; at U IF television and cellular-telephone frequencies, the guideline increases with increasing.frequen y, up.. to 5 mW/cm2, applying at microwave frequencies and above. The exposure guideline at AM frequencies is 100 mW/cm2. Exposures are to be averaged over a six- minute period, allo ing, for example, a two-minute exposure to fields three times the limit if the remainder of the si,i-minute period does not include any significant exposure. gives FCC O ice of Science and Technology Bulletin N . 65 (October- 1985) the formula for calculating pow6r density from an individual radiation source: 2.56 x 1.64 x 100 x RFF2 x [0.4xVERP + AERP] power density = 4iD2 in mW/cm2, where VERP = otal peak visual ERP (all polarizations), ii kilowatts, AERP = total aural ERP (all polarizations), in kilowatts, RFF = elative field factor at the direction to the actual point of calculation, and D = istance from the center of radiation to the point of calculation, in meters. The factor of 2.56 ccounts for the increase in power density due to ground reflection, assuming a reflection coefficie t 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 isotr pie radiator. The factor of 0.4 converts ; eak visual ERP to an average RMS value; for FM and cellular stations, of course, the value of VERPis zero. The factor of 100 in the numerator converts to the desired units of power density. • This formul has been built into a computer program by Hammett & Edison that calculates, at each location on an arbitrary rectangular grid, the total expected power density from any number of individual radiat on sources. The program also allows for It he description of the actual terrain at the site to obtain ore accurate projections. The calculated results are shown on a plat of the calculation grid as percentage o` the appropriate ANSI limit. A solid black dot appearing on the plat indicates anF field calculated to be in excess of 1% of the appropriate limit. The dots increase in size p oportionally with the magnitude of the I calculated field up to 100% of the appropriate limit. t calculated fi�eelds above 100% of the limit, the dots become open circles, again increasing in size p><oportionally With the magnitude of the calculated field. • HEHAMMETT& EDIS N, INC. 940029 CONSULTING F.NGINI?EKS SAN f°KANCISC(I Figure 3 1 Nextel Communications • Stanford Site • Los Altos Hills, California Calculated RF Power Density IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII - 100- 90- - 80- -_ 70- - 60- - 50- 40- 30- 20- - 10— 1,— 5 - — - - t — 0— I A _ -10— I _ -20- I _ -30- I - -40- , I - -50- - -60- -70- - -80- - - -90- _ -100- - I I I I I I I I I I I I I I I I I I I I I I I I I I. I I I I I I I I I I I I I I I oo • 0 oo o 0 0 0 0 cn 0 - 0 — 0 0 0 0 0 0 0 0 o METERS I—lslsl -1 25 0 25 50 Calculations performed according to OST Bulletin No.65,October 1985. 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