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HomeMy WebLinkAboutMCUP 13-03; T-Mobile The Islands; Conditional Use Permit (CUP) (3)c 0 YOUR BE SAFETY PARWER RADIO FREQUENCY ELECTROMAGNETIC FIELDS EXPOSURE REPORT Prepared forT -Mobile c/o Mitchell J Architecture, Inc. Site Name: Site ID: Site Type: The Island SD06398A Rooftop Located at: 5814 Van Allen Way, Suite B Carlsbad, CA 92008 Latitude: 33.1346 I Longitude: -117.2876 Report Date: 12/6/2012 Page 1/11 EXECUTIVE SUMMARY Dtech Communications, LLC ("Dtech") has been retained by Mitchell J Architecture, Inc, contractors toT-Mobile, to determine whether its wireless communications facility complies with the Federal Communications Commission ("FCC") Radio Frequency ("RF") Safety Guidelines. This report contains a computer-simulated analysis of the Electromagnetic Fields ("EMF") exposure resulting from the facility. The table below summarizes the result at a glance: Table 1: EMF Summary T-Mobile Summary Access to antennas locked Recommended RF Sign( s) @ access point( s) Recommended RF Sign(s)@ antennas Recommended Barrier( s) @ sectors NA Max cumulative EMF level for 13.4% General Population T -Mobile on ground Max cumulative EMF level for 13.4% General Population facility on ground Max cumulative EMF level for 467.0% General Population T-Mobile on roof (93.4% Occupational) Max cumulative EMF level for 467.1% General Population facility on roof (93.4% Occupational) FCC Compliant Yes-with recommendations BACKGROUND Dtech uses the FCC's guidelines described in detail in Office of Engineering & Technology, Bulletin No. 65 ("OET -65") "Evaluating Compliance with FCC Guidelines for Human Exposure to Radiofrequency Electromagnetic Radiation". Table 2 below summarizes the current Maximum Permissible Exposure ("MPE") safety limits classified into two groups: General population and Occupational. 11526 Sorrento Vallo Road. Ste. F"' San Diego, CA 92121 "' 858.792.0066"' www.dterhmm.rom Page 2/11 Frequency (Mhz) 30-300 300-1500 1500- 100,000 c 0 Table 2: FCC MPE Limits {from OET-65) General Population/ Uncontrolled MPE (m \'V./ cm2) 0.2 Frequency (Mhz)/1500 2-1 1.0 Averaging Time (minutes) 30 30 30 Occupational/ Controlled MPE (m\\'/cm2) 1.0 5.0 Averaging Time (minutes) 6 6 6 General population/uncontrolled limits apply in situations in which the general public may be exposed or in which persons who are exposed as a consequence of their employment, and may not be fully aware of the potential for exposure or cannot exercise control over their exposure. Therefore, members of the general public always fall under this category when exposure is not employment-related. Occupational/controDedlimits apply in situations in which persons are exposed as a consequence of their employment, and those persons have been made fully aware of the potential for exposure and can exercise control over their exposure. Occupational/ controlled limits also apply where exposure is of a transient nature as a result of incidental passage through a location where exposure levels may be above general population/uncontrolled limits, as long as the exposed person has been made fully aware of the potential for exposure and can exercise control over his or her exposure by leaving the area or by some other appropriate means. It is important to understand that the FCC guidelines specify exposure limits not emission limits. For a transmitting facility to be out of compliance with the FCC's RF safety guidelines an area or areas where levels exceed the MPE limits must, flrst of all, be in some way attessible to the public or to workers. When accessibility to an area where excessive levels is appropriately restricted, the facility or operation can certify that it complies with the FCC requirements. 11526 Sorrento Va!Jg· Road. Ste. F .A San Diego. C4 92121 .A 858.792.0066 .A www.dtethcom.mm Page 3/11 SITE DESCRIPTION The wireless telecommunication facility is located on a building rooftop. Sector A & B antennas are mounted inside a cupola behind RF screen walls above the main roof and sector C antennas are recessed into the parapet wall. All antennas are connected to the equipment via coaxial cables. Technical specifications provided below are gathered from physical field surveys where possible, provided drawings and/ or other documents provided by our clients, site/building managers and other licensees at this facility. "Generic", "Others", "Unknown" and conservative estimates are used where information is not available. Nextel is co-located at this facility. Table 3: Site Technical Specifications A1 T-Mobile Andrew Panel 2100 65 1936 30.7 A2 T-Mobile Andrew TMB~16 Panel 1900 335 65 4.3 unused unused unused 104 80 30.7 A2 T-Mobile Andrew TMB~16 Panel 2100 335 65 4.3 1 2070 104 80 30.7 B1 T-Mobile Andrew TMB.:«-6516 Panel 1900 100 65 4.3 3425 106 77 30.7 B1 T-Mobile Andrew TMBX*6516 Panel 2100 100 65 4.3 15.4 1936 106 77 30.7 5.2 B2 T-Mobile Andrew TMBXX-6516 Panel 1900 100 65 4.3 15.4 unused unused unused 104 75 30.7 5.2 B2 T-Mobile Andrew TMB:xx.6516 Panel 2100 100 65 4.3 15.4 1 2070 104 75 30.7 5.2 C1 T-Mobile Andrew TMB:«-6516 Panel 1900 220 65 4.3 15.4 3425 52 37 30.7 5.2 C1 T-Mobile Andrew TMBXX-6516 Panel 2100 220 65 4.3 15.4 1936 52 37 30.7 5.2 C2 T-Mobile Andrew TMB:«-6516 Panel 1900 220 65 4.3 15.4 unused unused unused 0 47 38 30.7 5.2 C2 T-Mobile Andrew TMBXX-6516 Panel 2100 220 65 4.3 15.4 2070 47 38 30.7 5.2 1 """''" Generic Generic Panel BOO 20 80 12 Generic Generic Generic 400 9 60 31 5.5 Nextel Generic Generic Panel BOO 20 80 12 Generic Generic Generic BOO 10 59 31 5.5 Ne.xtel Generic Generic Panel BOO 20 80 12 Generic Generic Generic 400 12 59 31 55 Nextel Generic Generic Panel BOO 200 80 12 Generic Generic Generic 400 10 55 31 5.5 Nextel Generic Generic Panel BOO 200 80 12 Generic Generic Generic BOO 9 55 31 5.5 Nextel Generic Generic Panel BOO 200 80 12 Generic Generic Generic 400 56 31 5.5 Nextel Generic Generic Panel BOO 290 80 12 Generic Generic Generic 400 57 31 5.5 Nextel Generic Generic Panel BOO 290 80 12 Generic Generic Generic BOO 58 31 5.5 Nextel Generic Generic Panel BOO 290 80 12 Generic Generic Generic 400 7 59 31 5.5 11526 Somtzto Va!!v Road, Ste. F £San Diego, CA 92121 £ 858.792.0066£ www.dteth(()m.(()m Page 4/11 Figure 1: Site Map 11526 Som11to Valli!)· Road. Ste. F .& Sa11 Diego. C4 92121 .& 858.792.0066 .& JVJJJJv.dtedJtvm.<"0/11 Page 5/11 RESULTS Figure 2: Result-The top (bird's rye) vieJJJ of the resulting MPE (Maximum Permissible E>..posure) map surrounding the fadli!J. 'll.llfPCC- Pullllc ... _.Umll • X>S.OOO D 500 <X s s.ooo • 100 <Xs 500 • 5<X S100 0 x ss Max Slm Levels T -Mobile: 13.•% Cumul.tlve: 13.•% Site 10: SD06398A T-Mobile: Simulation Diagram / T-Moblle Sec:torC Ground Level Elevation:O' T-Mobile Sector A T-Moblle Sector& -- 25ft ••• 11526 Somnto Valli!)' Road. Ste. F .& San Diego. CA 92121 .& 858.-92.0066 .& JVJVJv.dte<hmm.<"om Page 6/11 Figure 3: Result-The top (bird's rye) view of the resulting MPE (Maximum Permissible Exposure) map Stl"ounding the Jmiliry. %ofPCC-,_ ...... '-- • X>5.000 0 500<X ~5.000 • 100<X~500 • 5<X ~100 0 X~5 Max Slm Levels T -Mobile: W .O% umulatlve: W.1% Site ID: SD06398A T-Mobile: Simulation Diagram Roof Level Elevation:25.5' T~oblle Sector A 25ft ••• 11526 Somnto Valley Road. Ste. F .A. San Diego. C4 92121 .A. 858.792.0066 .A. IVIVIV.rltedxom . .-om Page 7/11 0 0 RECOMMENDATION(S) On the ground, calculations forT-Mobile's site including contributions from existing carriers resulted in exposure levels below the FCC's most stringent General Population MPE Limits in accessible areas. On the roof, the highest exposure level is below the FCC's Occupational but above the General Population MPE Limits near the T -Mobile antennas. There may be situations where workers i.e. window washers, painters, etc. may find themselves directly in front of the antennas. For the facility to be classified as an Occupational/Controlled environment, the following action(s) would be sufficient to meet the FCC's RF Safety Guidelines: 1) Access to the roof deck must be kept locked to restrict routine access by the general public. 2) Install RF advisory sign(s) in accordance with T-Mobile's RF policy at access point(s) or path( s) to the antennas and/ or at each sector to establish awareness for potential exposure. 3) Individuals entering the site or working near/in front of antennas must receive appropriate RF safety training1 and be made aware of the potential HotZones (areas exceeding the FCC's MPE Limits). In addition, contact information should be made available in the event work is required within the HotZones. Compliance actions, if necessary, for the other carrier(s) at this site have not been determined as part of this study since estimates were used for their site specifications. CONCLUSION Based on the above results, analysis and recommendation(s), it is the undersigned's professional opinion thatT-Mobile's site including contributions from existing carriers can comply with the FCC's RF Safety Guidelines. The worse-case exposure levels in publicly accessible areas are below the FCC's General Population MPE Limits. 1 See Appendix C for Dtech Communication's RF Safety training program-Antenna View 11526 Sorrento ValkJ· Road, Ste. F A San Diego. C4 92121 A 858.792.0066 A www.dtethtvm.l'om Page 8111 0 CERTIFICATION This report has been prepared by or under the direction of the following Registered Professional Engineer: Darang Tech, holding California registration number 16000, with renewal date of06/30/13. 11526 Sorrento Vally Road, Ste. F A San Diego. C4 92121 A 858.792.0066 A www.dteth(om.tom Page 9/11 Appendix A: Measurement and/ or Computer Simulation Methods Spatial averaging measurement technique is used. An area between 2 and 6 feet, approximately the size of an average human, is scanned in single passes from top to bottom in multiple planes. When possible, measurements were made at very close proximity to the antennas and inside the main beam where most of the energy is emitted. The maximum levels (max-hold) were recorded. Dtech uses an industry standard power density prediction computer Modef to assess the worse-case, cumulative EMF impact of the surrounding areas of the subject site. The Model does not take into account losses due to buildings. Its methodologies are conservative enough to account for typical down-tilts deployed in wireless communications. In addition, the analysis is performed at 100% duty cycle-all transmitters are active at all times and transmitting at maximum power. For purposes of a cumulative study, nearby transmitters are included where possible. The result is a surrounding area map color-coded to percentages of the applicable FCC's MPE limits. A result higher than 100% exceeds the limits. Appendix B: Limitations Dtech performed this analysis based on data provided by our clients that Dtech believes to be true and correct. Estimates where noted, are based on common industry practices and our best interpretation of available information. As mobile technologies continuously change, these data and results may also change. Therefore, Dtech disclaims all other warranties either expressed or implied. Any use of this document constitutes an agreement to hold Dtech and its employees harmless and indemnify it for any and all liability, claims, demands, litigation expenses and attorneys fees arising from such use. This is a technical document and may contain minor grammatical and/ or spelling errors. 2 Roofview® Version 4.15, Richard Tell Associates, Inc.© 1996-2000. 11526 Sorrento Va!!v· Road, Ste. FA San Diego. CA 92121 A 858.792.0066 A www.dtedJ,YJm.com Page 10/11 •• l • c 0 Appendix C: Antenna View® Dtech Communications offers a unique, online tool (Antenna View®) to train, identify and inform individuals of site-specific HotZones-areas that exceed the FCC's Safety Limits. Antenna View® is an online, interactive training tool that will educate nontechnical people in about ten minutes. It is a site-specific, RF safety training program that requires the end user to sign an online agreement thereby limiting the liability to the landlord and carriers. Some of the advantages include: • Virtual walk-through in 3-D with corresponding photographs • Site-specific, interactive, simple to understand • Delivers pertinent information i.e. HotZones (areas exceeding FCC safety limits), site owners and contact numbers. • User online agreement= accountability We invite you to take a quick tour at www.Antenna View.com and see how easy to understand and informative Antenna View® is. Under Article 47 CFR§ 1.1307(b), the FCC & OSHA mandates wireless operators/fadliry owners to have an RF surory completed including a stifery plan and training to ensure that their tenants, emplqyees and contractors who work in or around RF sites are aware of the potential risks posed l!J RF radiation. Most cell sites are located on building rooftops where HV AC contractors, window washers, painters, etc. routine!J work and generai!J do not know what antennas even look like. Dtech Communications can help with ongoing FCC/ OSHA compliance and provide practical training that is ea!Y to understand l!J at!Jone regardless of their technical background 11526 Sorrento TTa/!9· Road, Ste. F • San Diego. C4 92121 • 858.792.0066 • www.dte,hmm.mm Page 11111