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Home My WebLink About1480 Burlingame Avenue - Technical Studyb ELECTROMAGN ETIC EN ERGY (EME) EXPOSU RE REPORT � ��;� _ 1� -�+ _- _ �� ::� P� epared By: r r- ' � � � � � E\CiI�'EERI�C� /, ` �'* � ,� ,; . � ,.,�r � � ; n . � , \ �� .��-` __ f : . � �.� `ti - '�"� ` ''`"�, '�.� � ;�, �;: �: - � f 'r �� ` ,. � �. � _ , r� F��:'`;� ��y'�'' .�., . ! ,,�� C ' � �. '.. ��+ T �' � a ✓�r j � �� ,�,�; � ♦ ;�i ;1' p r , � ef f�� t ��"' ,,:� � s;'. ' �A:� t�� ► Site Name: Site ID: USID: FA Location: Site Type: �OCqtlOfl: LqtltUti@ (NAD83): longitude (Na�83): Report Completed: AT8�T M-RFSC .��.�� Central Burlingame CCL00566 13300 10095832 Rooffop 1480 Burlingame Avenue Burlingame, CA 94010 34.5769639 -122.3498011 July 23, 2015 Casey Chan Prepared for: AT8�T Mobility c/o Caldwell Compliance, Inc. 6900 Koll Center Parkway. Ste. 401 Pleasanton, CA 94566 Site Overview and Description • The proposed antennas are mounted on a rooftop • The site consists of three (3) sectors with a total of twelve (12) antennas (9 transmitting and 3 spare antennas) • There are no separate structures within forty (40) feet of the transmitting antennas • The site is co-located with Unknown antennas iant with recommendations OSC Engineering Inc. � www.OSCengineering.com � 858 436 4120 Page 2/21 Compliance Notes Occupational Safety & Compliance Engineering (OSC Engineering) has been contracted by Caldwell Compliance, Inc. to conduct an RF (radio frequency) computer simulated analysis. The Federal Communications Commission (FCC) has set limits on RF energy exposed to humans on a wireless cell site in order to ensure safety. The FCC has also mandated that all RF wireless sites must be in compliance with the FCC limits and a compliance check must be performed annually to ensure site compliance. This report is an in depth analysis summarizing the results of the RF modeling provided to us by AT8�T and in relation to relevant FCC RF compliance standards. A reanalysis is recommended upon the site going on air. OSC Engineering uses the FCC OET-65 as well as AT8�T Standards to make recommendations based on results and information gathered from drawings and Radio Frequency Data Sheets. For this reporf, OSC Engineering utilized Roofview0 software for the theoretical analysis of the AT&T Cellular Facility. A site-specific compliance plan is recommended for each transmitting site. This report serves as a single piece of the overall compliance plan. Information utilized for this report: RFDS: DWGs: SAN-FRANCISCO-SACRAMENTO_SAN-FRANCISCO_CNU0566_PM201 _2015-LTE- Next-Carrier LTE-3C_eh5556_3701865618_10095832_13300_01-23- 2015_Preliminary-Approved_v5.00 CCL00566_10095832_AE201_100� CDs Rev 0 6 25 15_LTE 3C AWS OSC Engineering Inc. � www.OSCengineering.com � 858 436 4120 Page 3/21 Compliance Results of the Proposed Site (theoretical simulation) Max RF Exposure Level from (AT8�T antennas @ roof): 172.6 � FCC General Population MPE Limit Max RF Exposure Level simulated (cumulative roof): 172.8 % FCC General Population MPE Limit Max RF Exposure Level simulated (AT8�T antennas @ ground): 2.20 � FCC General Population MPE Limit Max RF Exposure Level simulated (cumulative ground): 3.80 % FCC General Population MPE Limit OSC Engineering Inc. � www.OSCengineering.com � 858 436 4120 Page 4/21 FCC Regulations and Guidelines from OET 65 When considering the contributions to field strength or power density from other RF sources, care should be taken to ensure that such variables as reflection and re-radiation are considered. In cases involving very complex sites predictions of RF fields may not be possible, and a measurement survey may be necessary The process for determining compliance for other situations can be similarly accomplished using the techniques described in this section and in Supplement A to this bulletin that deals with radio and television broadcast operations. However, as mentioned above, at very complex sites measurements may be necessary. In the simple example shown in the below diagram, it is desired to determine the power density at a given location X meters from the base of a tower on which are mounted two antennas. One antenna is a CMRS antenna with several channels, and the other is an FM broadcast antenna. The system parameters that must be known are the total ERP for each antenna and the operating frequencies (to determine which MPE limits apply). The heights above ground level for each antenna, H1 and H2, must be known in order to calculate the distances, R1and R2, from the antennas to the point of interest. l HI Pni�tt �rJ'I�rtcrc•st � 111 � OET Bulletin 65, Evaluating Compliance with FCC Guidelines for Human Exposure to Radiofrequency Electromagnetic Fields, Page 37- 38 OSC Engineering Inc. � www.OSCengineering.com � 858 436 4120 Page 5/21 Computer Simulation Analysis The Federal Communications Commission (FCC) governs the telecommunications senrices, facilities, and devices used by the public, industrial and state organizations in the United States. "RoofViewO is a software analysis tool for evaluating radiofrequency (RF) field levels at roof-top telecommunications sites produced by vertical collinear antennas of the type commonly used in the cellular, paging, PCS, ESMR and conventional two-way radio communications services."2 "RF near-field levels are computed from selected antennas by applying a cylindrical model that takes into account the antenna's aperture height, mounting height above the roof, azimuthal beam width for directional antennas and the location of the antennas on the roof Resulting, spatially averaged power densities are expressed as a percentage of a user selectable exposure limit depending on frequency. The entire roof is composed of one-square-foot pixels and RF fields are computed for each of these pixels for each selected antenna."3 Computer simulations produced for clients are simulated with "Uptime = 100�". This means that all transmitters associated with an antenna are considered to be "on". 4 RoofViewO uses a near-field method of computing the field based on assuming that the total input power delivered to the antenna, at its input terminal, is distributed over an imaginary cylindrical surface surrounding the antenna. The height of the cylinder is equal to the aperture height of the antenna while the radius is simply the distance from the antenna at which the field power density is to be computed. Within the aperture of the antenna, this approximation is quite accurate but as the antenna is elevated above the region of interest, the model output must be corrected for mounting height. S S= P 2�Rh 2 Roofview User Guide 4.15, Page 7, Richard A Tell Associates 3 Roofview User Guide 4.15, Page 7, Richard A Tell Associates 4 Roofview User Guide 4.15, Page 10, Richard A Tell Associates 5 Roofview User Guide 4.15, Page 45, Richard A Tell Associates OSC Engineering Inc. � www.OSCengineering.com � 858 436 4120 Ppge 6/21 Antenna Inventory All technical data and specifications shown below are collected from drawings and/or documents provided by the client, as well as from online databases and/or a visit to this facility. Unknown wireless transmitting antennas are simulated using conservative values when information is not available. A1 AT&T LTE 700 A1 AT&T LTE 1900 A2 AT&T UMTS 850 A2 AT&T UMTS 1900 A3 AT&T GSM 850 A3 AT&T LTE 2100 A4 Spare 0 B1 AT&TLTE 700 61 AT&T LTE 1900 B2 Spare 0 63 AT&T GSM 850 63 AT&TLTE 2100 64 AT&T UMTS 850 64 AT&T UMTS 1900 G1 AT&T UMTS 850 G1 AT&T UMTS 1900 G2 AT&T LTE 700 G2 AT&TLTE 1900 1239.7 3453.4 1897.8 3453.4 574.4 4834.3 0.0 1239.7 3453.4 0.0 574.4 4834.3 1897.8 3453.4 1897.8 3453.4 1239.7 3453.4 13.15 16.35 13.75 16.35 12.15 16.05 0 13.15 16.35 0 12.15 16.05 13.75 16.35 13.75 1635 13.15 16.35 60 80 80 80 35 120 0 60 80 0 35 120 80 80 80 80 60 80 Panel Panel Panel Panel Panel Panel Panel(Spare) Panel Panel Panel(Spare) Panel Panel Panel Panel Panel Panel Panel Panel Kathrein Kathrein Kathrein Kathrein Commscope Commscope Kathrein Kathrein Kathrein Kathrein Commscope Commscope Kathrein Kathrein Kathrein Kathrein Kathrein Kathrein 800-10765 800-10765 742-265 742-265 56NHH-1D65B SBNHH-1D65B 800-10765 800-10765 800-10765 800-10765 SBNHH-1D656 SBNHH-1D656 742-265 742-265 742-265 742-265 800-10765 800-10765 OSC Engineering Inc. � www.OSCengineering.com � 858 436 41 20 2 2 2 2 2 2 0 2 2 0 2 2 2 2 2 2 2 2 320 320 320 320 320 320 320 200 200 200 200 200 200 200 80 80 80 80 6.29 6.29 6.34 6.34 6 6 6.29 6.29 6.29 6.29 6 6 634 6.34 6.34 6.34 6.29 6.29 68 62 67 65 66 63 65 68 62 65 66 63 67 65 67 65 68 62 76.9 76.9 76.8 76.8 77 77 76.9 76.9 76.9 76.9 77 77 76.8 76.8 76.8 76.8 76.9 76.9 8.7 8.7 8.6 8.6 8.8 8.8 8.7 8.7 8.7 8.7 8.8 8.8 8.6 8.6 8.6 8.6 8.7 8.7 Page 7/21 G3 AT&T GSM 850 574.4 12.15 35 Panel Commscope SBNHH-1D656 2 80 6 66 77 8.8 G3 AT&T LTE 2100 4834.3 16.05 120 Panel Commscope SBNHH-1D65B 2 80 6 63 77 8.8 G4 Spare 0 0.0 0 0 Panel (Spare) Kathrein 800-10765 0 80 6.29 65 76.9 8.7 X1 Unknown 1 1900 632.5 15 20.0 Panel Unknown Unknown - 60 4 65 78 9.8 X2 Unknown 1 1900 632.5 15 20.0 Panel Unknown Unknown - 60 4 65 78 9.8 D1 Unknown 10000 100.0 40 0.01 Dish Unknown Unknown - 0 5 10 75 6.8 D2 Unknown 10000 100.0 40 0.01 Dish Unknown Unknown - 180 5 10 75 6.8 OSC Engineering Inc. � www.OSCengineering.com � 858 436 41 20 Pqge 8/21 The01'2tiCal Simulation Result Diaqram - Cumulative Ground Level (Max Emission = 3.80% GP) For the purpose of theoretical simulation, OSC Engineering models antennas as if they are operating at full power (100� capacity). This assumption yields more conservative (higher) results. On-site measurements may yield different results, as antennas do not always operate at full capacity. To the right is a result diagram of the site in question. The diagram is a color- coded map per ND-00059 levels, which coincide with FCC MPE Limits. Any exposure resulting in a level higher than 100� exceeds the Limits and requires further action, such as barriers. A level exceeding 100� does not make a site out of compliance. All results are given in General Population percentages even when a site may be considered Occupational. LE ND � AT3T +� Unknown �� Cleorwlre cr��ker � Metto PCS SprinP T-MObile �r ve�izon � Omni �} o�sn Ant�nnps N.i,S. . sroo��. �e.,o� Z F000 ;c�r��..,,.�. ,cr �wo ie�o� � s000 rpp t fYpewm � 51�' OSC Engineering Inc. � www.OSCengineering.com � 858 436 4120 Page 9/21 se�ro� a . � . ,:� 200" N — `��,.< Theoretical Simulation Result Diagram — Cumulative Roof Level (Max Emission = 172.8% GP) _,.. ,..,�w ._.:..� ,...,_, � t;a►u�:;�� " . u LEGEND � AT&T +� Unknown � Clearwire Cricket �t Mefiro PCS Sprint ,` T-Mobite � V e r i z o n � Omni a� Dish Antennos N.T.t. Occup4tional MPE limit Sife Nome• Sector A `�:. 320° � .. : ti � �'��.. . ",::� `\ r r ' p¢ � ', � �� .k: �� „", � �, SeCtOr G 80° Sector B �''� :.� , � 200° \ b• zo� �o `�� N Lr� OSC Engineering Inc. � www.OSCengineering.com � 858 436 4120 Page 10/21 General Populafion 1+kPE limit Theoretical Simulation Result Diagram - ATB�T Mobility only Ground level (Max Emission = 2.20� GP) Site ID: CCL00566 Site Ncme: Central Burlingame LEGEND � AT&T � Unknown � Clearwire C r i c k e# � Metro PCS Sprint t-Mobile � V e r i z o n � Omni a� O i s h Antennas N.T.S. � OcCupotionc) MPE tfmlt �— 1 5 Exposure ��.��-.._ Gen�erel Populatfon MPE limit 5 s Exposure 0 5 Exposuro < S o a� ao• �: � Sector B 200° Sector A 320° � � � w�' � ,;� , �"�`... _ � v ,% ..� + �� . ;.. �� sector G �-'��/� 80° '. / �;�, /% N v�� OSC Engineering Inc. � www.OSCengineering.com � 858 436 4120 Page 1 1/21 Theoretical Simulation Result Diagram — AT8�T Mobility only Roof Level (Max Emission = 172.6% GP) LFGEND � AT�T Unknown Clearwire Cricket � Metro PCS Sprint T-Mobile r� verizon � Omni a� �ish Hniennos N.T.S. ,�. Otcupvtiona! MPE Limit �---- I <_ "exposure 0 5 Exposuro < t ,. .. .. Genera! Population MPE Limit S 5 Exposure i<�. f 0 5 Expos�ru < 5 J 6�Q' 30 Site ID: CCL00566 Site Name: Centraj _�ngome Sector A 320° C� s�� N • ,. r � r�: ':'v`. , :_�;` �ti� f ' ' "�� ..- ... $@C10( G � _ 1r.�``� ,/` 8�° `� �.;r�/ •% '*V� Sector B � � 200° � _. ; ; � N �v�� OSC Engineering Inc. � www.OSCengineering.com � 858 436 4120 Page 12/21 Microwave Antennas The input power for the microwave antenna(s) utilizes a generic default value of .O1 Watts. This value is below the maximum for General Population RF Safety Compliance per the AT&T ND-00059 document. Therefore the microwave antennas are determined to be compliant with AT&T Mobility's guidelines. Microwave Antenna � :;:.:�.;_.,:-------------------------r-- T- t R ----------- ---------- f Near-Field Region ; Transition Region ; Far-Field Region � � � -----� ------------� "'_"_'_"'_"�""""""""_" L_____________ 1_'___'______________ I I � 16�P � ' � � � S ' S R ' S PG Power � d� �f 7�D2 ' nf rrf � _ density ii � (Max power density � � R � ff 4�rR3 � � in the near-field ; ; �' � region) ; ; -----------------------� --------------------� ---------------�- �----- 1-------------------- � i i i At D3 �.6 D2 Distance }s,perture Rnf = dh Rff - �, Geometry and equations for computation of exposure levelsb Maxinni ni Power i irko M icrovrr��ve Anta�na In �ut Parts Diameter Power (ft� �Cm) �V+J� � JV.� V.Q� f 2 61.0 0.� 3 91.4 1.6 4 1 �1.9 2.9 5 1 �2. � �.5 6 1 �2.9 6.5 7 213. � 8.8 8 243.8 11.6 9 274.3 14.� � a �o�.a �s.� �� .� ��.o 1 � 3��.8 26.2 �3 396.2 30.� 14 ��6.7 35.6 1 a �57.2 �0.9 Maximum power into microwave antenna ports for GP RF safety compliance� b ND-00059 Rev 5.1 Page 29 of 81. Section; Microwave site � ND-00059 Rev 5.1 Page 30 of 81. Section; Microwave site OSC Engineering Inc. � www.OSCengineering.com � 858 436 4120 Page 13/21 Certification The undersigned is a Professional Engineer, holding a California Registration No. 19677 Reviewed and approved by: John B. Bachoua, PE Date: July 23, 2015 The engineering and design of all related structures as well as the impact of the antennas on the structural integrity of the design are specifically excluded from this report's scope of work. This report's scope of work is limited to an evaluation of the Electromagnetic Energy (EME) RF emissions field generated by the antennas listed in this report. When client and others have supplied data, it is assumed to be correct. OSC Engineering Inc. � www.OSCengineering.com � 858 436 4120 Page 14/21 FCC MPE Limifs (from OET-65) OSC Engineering uses the FCC's and clients' guidelines to model the computer simulation. Explained in detail in Office of Engineering & Technology, Bulletin No. 65 ("OET-65") "Evaluating Compliance with FCC Guidelines for Human Exposure to Radiofrequency Electromagnetic Radiation". Occupafional/controlled8 exposure limits apply to situations in which persons are exposed as a consequence of their employment and in which those persons who are exposed have been made fully aware of the potential for exposure and can exercise control over their exposure. Occupational/controlled exposure 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 (see below), 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. As discussed later, the occupational/controlled exposure limits also apply to amateur radio operators and members of their immediate household. General populafion/uncontrolled9 exposure limits apply to situations in which the general public may be exposed or in which persons who are exposed as a consequence of their employment may not be made fully aware of the potential for exposure or cannot exercise control over their exposure. Therefore, members of the general public would always be considered under this category when exposure is not employment-related, for example, in the case of a telecommunications tower that exposes persons in a nearby residential area. $ OET-65 "Evaluating Compliance with FCC Guidelines for Human Exposure to Radiofrequency Electromagnetic Fields pg. 9. 9 OET-65 "Evaluating Compliance with FCC Guidelines for Human Exposure to Radiofrequency Electromagnetic Fields pg. 9. OSC Engineering Inc. � www.OSCengineering.com � 858 436 4120 Page 15/21 Limits for Maximum Permissible Exposure (MPE)�o "The FCC Exposure limits are based on data showing that the human body absorbs RF energy at some frequencies more efficiently than at others. The most restrictive limits occur in the frequency range of 30-300MHz where whole-body absorption of RF energy by human beings is most efficient. At other frequencies whole-body absorption is less efficient, and, consequently, the MPE limits are less restrictive.">> (A) Limits for OccupationalJControlled Exposure Fr�quercy Electric Field ti1agr}�tic: Field Power Densty ;Sj �Svera�ing Time Fange {MHzj �t�en�th (EJ (�'/m} .�trer��tr (H) (A; r�) (m'N,�cm'; � E �', � H �° o� S (mir;utes� (�.3-3.0 o 14 1.b� (10�� ' b �.0-3�� a21- �.�,�,�f ,�ac7/'=�}* 6 32-3��C 6�.� 0.103 1.0 6 30�-15(�CM -- -- fI30Cf b 1 ��C-1 OCF,��Q -- -- 5 b (B} Limits for General Population jUncontrolled Expo�ure Frequercy Electric Field ti1agn�tic Field Power C��ens ty ;S) Averaqing Time �ange (MHz) �t�ength (E) (V; m) �trer�� tr (H) (A,'r�j (ni'NJcrn=; I� I�- I H �= or S (mir�utes j G.3-1.34 o i 4 1.6�� { 1 s��j ' 3�J 1.34-30 �24/f 2.19Jf ; � 8t?I'n}' �i0 3�-:��C 2,'.5 0.0?3 0.� 3�J 30�-15CC� -- -- f/ 154�� 3�3 1 ��G-1 OCE,��CU -- -- 1.0 3�� f= Frequen :y n MHz `Plct►�v ��+�ave equiv�alent pc�ver d�nsity �� OET-65 "FCC Guidelines Table 1 pg. 72. >> OET-65 "FCC Guidelines for Evaluating Exposure to RF Emissions", pg. 8 OSC Engineering Inc. � www.OSCengineering.com � 858 436 4120 Page 16/21 Limits for Maximum Permissible Exposure (MPE) continued 12 Fiqure 9. FCC Limifs for Maximum Permrssible Exposure (MPE) Plane-wave Equivaler�f Power Density � o. 9 L 0.03 0.3 j 3 1.34 OccupationaUConirolfed Exposure ---- General Populatior�/Uncontm!!ed Exposure 30.000 fi 300,Of)D 30 30C1 � 3.1Jt10 O1 1.500 ?Qd.000 Frequency (MHz) "MPE Limits are defined in terms of power density (units of milliwatts per centimeter squared: mW/cm2), electric field strength (units of volts per meter: V/m) and magnetic field strength (units of amperes per meter: A/m). In the far-field of a transmitting antenna, where the electric field vector (E), the magnetic field vector (H), and the direction of propagation can be considered to be all mutually orthogonal ("[plane-wave" conditions], these quantities are related by the following equation: , � S - �� - 37' . 7�` �770 w�ere: S = po��r densitw (m17�+:'cm`) E = elects-ic field s#ren� (�T�nt} H = ma�etic field �tte�� (.�r`m� 12 OET-65 "FCC Guidelines Table 1 pg. 72. OSC Engineering Inc. � www.OSCengineering.com � 858 436 4120 Page 17/21 \ �, � � � `-----,. limitations OSC Engineering completed this evaluation analysis based on information and data provided by the client. The data provided by the ciient is assumed to be accurate. Estimates of the unknown, standard, and additional transmitting sites are noted and based on FCC regulation and client requirements. These are estimated to the best of our professional knowledge. This report is completed by OSC Engineering to determine whether the wireless communications facility complies with the Federal Communications Commission (FCC) Radio Frequency (RF) Safety Guidelines. The Office of Engineering and Technology (OET-65) Evaluating Compliance with FCC Guidelines for Human Exposure to Radiofrequency Electromagnetic Radiation has been prepared to provide assistance in determining whether proposed or existing transmitting facilities, operations or devices comply with limits for human exposure to radiofrequency (RF) fields adopted by the Federal Communications Commission (FCC)13. As each site is getting upgraded and changed, this report will become obsolete as this report is based on current information per the client, per the date of the report. Use of this document will not hold OSC Engineering Inc. nor it's employees liable legally or otherwise. This reporf shall not be used as a determination as to what is safe or unsafe on a given site. All workers or other people accessing any transmitting site should have proper EME awareness training. This includes, but is not limited to, obeying posted signage, keeping a minimum distance from antennas, watching EME awareness videos and formal classroom training. �3 OET-65 "FCC Guidelines for Evaluating Exposure to RF Emissions", pg. 1 OSC Engineering Inc. � www.OSCengineering.com � 858 436 4120 Page 18/21 EH8�S and OSHA Barrier Consideration Environmental, Health and Safety (EH8�S) guidelines prohibit construction of RF safety barriers that extend to, or are within the 6-ft setback from, unprotected roof edges but do not meet the OSHA fall protection requirements of 29 CFR 1910.23 and 29 CFR 1926.500 through 1926.503. The following details are intended to assist AT&T RF safety engineers and RSVs in meeting the AT8�T Mobility RF safety compliance guidelines as defined in ND-00059. Whereas, AT8�T employees and contractors working within 6 ft. from an unprotected roof edge must follow OSHA guidelines with respect to fall protection and roof line safety.14 For Clarity: Unprotected roof edge refers to a parapet less than thirty-six (36) inches in height. �`� RF Safety Barrier 6-ft Rule v3_ehscints_EHS cmts_ws, "Installing Radio Frequency (RF) safety barriers on roofs with unprotected edges job aid" Page 1 Overview OSC Engineering Inc. � www.OSCengineering.com � 858 436 4120 Page 19/21 AT8�T Antenna Shut-Down Protocol AT&T provides Lockout/Tagout (LOTO) procedures in Section 9.415 (9.4.1- 9.4.9) in the ND-00059. These procedures are to be followed in the event of anyone who needs access at or in the vicinity of transmitting AT8�T antennas. Contact AT8�T when accessing the rooftop near the transmitting antennas. Below is information regarding when to contact an AT8�T representative. 9.4.7 Maintenance work being performed near transmitting antennas Whenever anyone is working within close proximity to the transmitting antenna(s), the antenna sector, multiple sectors, or entire cell site may need to be shut down to ensure compliance with the applicable FCC MPE limit. This work may include but is not limited to structurai repairs, painting or non-RF equipment services by ATB�T personnel/contractors or the owner of a tower, water tank, rooftop, or other low-centerline sites. The particular method of energy control will depend on the scope of work (e.g., duration, impact to the antenna or transmission cabling, etc.) and potential for RF levels to exceed the FCC MPE limits for General Population/Uncontrolled environments 9.4.8 AT&T Employees and Contractors ATB�T employees and contractors performing work on ATB�T cell sites must be trained in RF awareness and must exercise control over their exposure to ensure compliance with the FCC MPE limit for Occupational/Controlled Environments ("Occupational MPE Limit"). The rule of staying at least 3 feet from antennas is no longer always adequate to prevent exposure above the Occupational MPE Limit. That general rule was applied early in the development of cellular when omni-directional antennas were primarily used and later when wide-beamwidth antennas were used. That application was then appropriate for the Occupational exposure category. However, the current prevalence of antennas with 60- and 70- degree horizontal half-power beamwidths at urban and suburban GSM and UMTS/HSDPA sites raises some question about the continued reliability of the 3-foot rule. Antennas with low bottom-tip heights and total input powers around 70-80 W can produce exposure levels exceeding the Occupational MPE Limits at 4 feet, and these levels can be augmented by emissions of co-located operators. Therefore, AT8�T employees and contractors should apply the above general work procedures and use an RF personal monitor to assess exposure levels within the work vicinity. 9.4.9 Other Incidental Workers All other incidental workers who are not trained in RF safety are considered general public and subject to the FCC MPE limits for General Population/Uncontrolled Environments. In such instance, the M-RFSC (primary contact) or R-RFSC (secondary contact) must refer to the Mobility RF site survey plan to assess the potential RF exposure levels associated with the antenna system. If capable of exceeding the FCC General Population/Uncontrolled MPE limit, then local sector/site shutdown is necessary. The FE/FT must also follow the local shutdown procedure and use their RF personal monitor as a screening tool for verification, as necessary. 15 ND-00059_Rev_5.1 "Lockout/Tagout (LOTO) Procedures" Page 45. OSC Engineering Inc. � www.OSCengineering.com � 858 436 4120 Page 20/21 RECOMMENDATIONS •Access Point Information 1 Sign @ all roof access point(s) (to be posted) •AT8�T Sector A To be installed: a 3' X 3' wide physical barrier in front of A1 and a 3' x 7' wide physical barrier in front of A2 to A3 with Notice #2 Sign on all approaching sides of physical barrier If the parapet is less than 36" in height: Barriers must be built a minimum of 6 feet away from the roof edge to comply with OSHA safety standards •AT&T Sector 6 To be installed: a 3' X 3' wide physical barrier in front of Bl and a 3' x 7' wide physical barrier in front of B3 to B4 with Notice #2 Sign on all approaching sides of physical barrier If the parapet is less than 36" in height: Barriers must be built a minimum of 6 feet away from the roof edge to comply with OSHA safety standards •AT8�T Sector G To be installed: a 3' X 3' wide physical barrier in front of G3 and a 3' x 7' wide physical barrier in front of G1 to G2 with Notice #2 Sign on all approaching sides of physical barrier If the parapet is less than 36" in height: Barriers must be built a minimum of 6 feet away from the roof edge to comply with OSHA safety standards E=existing sign „_ ..._. __._ � t-��a� Mt4 1 � - ,� Info 5 � `Udo�� : `r� , �N,�� No1ip NoTi;6 s�+ s�+.� p...: •.. wura� � � �.�� c�ri� c�,no� iowor Sipr. Sgn o__.. .... `. , • � 7' 3' 3� �. ''�, � �' �, t . �g • � 3' 7' V \: ector G 80° `�u _ � � 3t/�',-�� SeC1or B � �� _- 2oQ° � - �' � 0 e :C ]: �� -. ... N � � �c.-�' � a.. '� �* �� .., . If work is being performed in the vicinity of the transmitting antennas, site shut-down procedures must be followed. See page entitled AT8�T Antenna Shut-down protocol for further information. OSC Engineering Inc. � www.OSCengineering.com � 858 436 4120 __ _ ,. � �_ - � - � � .. . _. ._..: ..;. . ¢ . , ,,.. ., -� . . �,:.,�_ �: - � � ��>, � 'POst of oll ��roof occess .�,: point(s) Sector A � "�` � 320° ' Page 21 /21