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DNS REVIEWED PLN NIER ReportNON -IONIZING ELECTROMAGNETIC EXPOSURE ANALYSIS ENGINEERING CERTIFICATION FOR at&t PROJECT: Modification to Existing Antennas AT&T SITE NAME: WA6358 — Lake Ballinger CROWN CASTLE SITE: 840470 — Lake Ballinger SITE ADDRESS: 23931 Highway 99 Edmonds, WA 98026 DATE: February 24, 2022 PREPARED BY: m• MORRISON HERSHFIELD 600 Stewart Street, Suite 200 Seattle, WA 98101 206-268-7370 -2- INTRODUCTION Morrison Hershfield has been retained by AT&T to evaluate a proposed AT&T telecommunications site as described below. Evaluation is for compliance with current Federal Communications Commission (FCC) and local rules regarding public exposure to radiofrequency (RF) electromagnetic fields (EMFs). PROJECT The proposed AT&T project consists of an existing WCF (Wireless Communications Facility) located at 23931 Highway 99, Edmonds, WA 98026; Latitude and Longitude: 47°46'54.30",-122°20'37.90". The planned improvements will include the placement of new antennas as described below. These antennas will be mounted to the existing mount assembly at top of a tower structure at 56' AGL worst condition to the centerline of the antennas. All antennas face outward and point directionally away. Therefore it is unlikely that anyone other than authorized RF workers could approach near enough to any of the transmit antennas to cause that person's RF exposure to exceed FCC limits. It is expected that RF exposure conditions near ground level at the site, and at all adjacent properties, due to the contributions from all transmitting antennas will be well below the FCC public exposure limit. PROPOSED EQUIPMENT Type of Service: 5G / LTE Cellular Antennas: Sector Azimuth Height Description Alpha: 30 56' (1) Existing Commscope / NNH4-65C-R6 Panel Antenna 30 56' (1) Existing Commscope / NNH4-65C-R4 CCIV2 Panel Antenna 30 58' (1) New NOKIA / AEQK Integrated Antenna Beta: 160 56' (1) Existing Commscope / NNH4-65C-R6 Panel Antenna 160 56' (1) Existing Commscope / NNH4-65C-R4 CCIV2 Panel Antenna 160 58, (1) New NOKIA / AEQK Integrated Antenna Gamma: 270 56' (1) Existing Commscope / NNH4-65C-R6 Panel Antenna 270 56' (1) Existing Commscope / NNH4-65C-R4 CCIV2 Panel Antenna 270 58' (1) New NOKIA / AEQK Integrated Antenna AT&T Site WA6358 — Lake Ballinger MH Project #: 220003900 -3- PROPOSED EQUIPMENT (cont) Maximum Power: 1692 watts CALCULATIONS Calculations for RF power densities near ground level are based on the "Evaluating Compliance with FCC Guidelines for Human Exposure to Radio Frequency Electromagnetic Fields, OET Bulletin 65" Edition 97-01, August 1997; issued by the Federal Communications Commission Office of Engineering & Technology. Compliance is determined by comparing RF field predictions with the general population/uncontrolled environment (i.e., "Public") Maximum Permissible Exposure limits (MPEs) allowed by the FCC rules, as specified in CFR 47 §1.1310. The following formula has been used to calculate the power densities at specific locations: S = 0.36 x ERP / RI 1►JI10 0- S = power density (mW/cm2) ERP = power in watts R = distance to the center of the radiation antenna (ft) Formula is based on Equation 9 on page 21 of OET Bulletin 65. It includes the effect of ground reflections. The Effective Radiated Power (ERP) depends on the vertical antenna pattern. THEORETICAL ANALYSIS All existing and proposed transmit antennas are highly directional and project the majority of the transmitted RF energy horizontally and well above all nearby accessible areas. The following theoretical calculations predict the peak exposure condition for a six-foot person standing at the nearest approach to the transmit antennas. A six-foot tall person standing on the ground near the base of the antenna support or building would be at least approximately 50 feet below all of the existing and proposed transmit antennas. AT&T Site WA6358 — Lake Ballinger MH Project #: 220003900 M CONTRIBUTION OF AT&T FACILITY TO RF EXPOSURE ENVIRONMENT Based on information provided by AT&T RF Engineers, the maximum ERP from any sector of the proposed AT&T facility will be less than or equal to 1692 watts with all channels activated. Thus the worst -case downward ERP is 16.92 watt (i.e., 1/100th of 100 watts) from the facility. By use of the power density formula previously described, with input values of 16.92 watt downwards ERP, and a distance of 50 feet, the worst -case calculated power density at head height from the AT&T facility to a six-foot person standing at ground level is 0.0024369 mW/cm2. AT&T antennas will transmit and/or receive at different MHz frequency bands worst case being the LTE at 700 MHz. The Public MPE limit for the LTE frequency transmitted by this facility is 0.47 mW/cm2. The worst -case calculated exposure condition resulting from the AT&T facility is the power density divided by the Public MPE limit = 0.5221929% of the Public MPE limit. All ground level areas are expected to have exposure conditions less than the calculated Public MPE due to the proposed AT&T facility. OTHER CARRIERS The following are examples of wireless carriers providing service to the local area: CDMA/LTE 700-2500 Mhz Sprint, Verizon, US Cellular GSM/UMTS/LTE 600-2100 Mhz AT&T, T-Mobile CONTRIBUTION OF OTHER EXISTING CARRIERS TO RF EXPOSURE ENVIRONMENT Based on our information, there is an unknown carrier currently collocated on the existing structure. Worst case parameters of similar facilities in the area, the maximum ERP from any sector of the existing antennas on the structure is less than or equal to 8000 watts with all channels activated. Therefore the worst -case downward ERP is 8000 / 100 = 80 watts from the existing facility. AT&T Site WA6358 — Lake Ballinger MH Project #: 220003900 -5- 1- By use of the power density formula previously described, with input values of 80 watts downwards ERP, and a distance of 35 ft, the worst -case calculated power density at head height from the existing Unknown facility #1 to a six-foot person standing at ground level is 0.0235102 mW/cm2. All of the existing antennas transmit and/or receive within the PCS, ESMR or Cellular frequency band. The Public MPE limit for all frequencies at worst case scenario for the purpose of this calculation is 0.40 mW/cm2. The worst -case calculated exposure condition resulting from the existing Unknown facility #1 is the power density divided by the Public MPE limit = 5.8775510% of the Public MPE limit. All accessible ground level areas are expected to have exposure conditions less than the calculated Public MPE due to this existing facility. COLOCATED FACILITITES TOTAL MPE The predicted maximum worst -case RF exposure conditions resulting from all proposed and existing wireless facilities at all ground -level areas is the arithmetic sum of the contributions from each facility: 0.5221929 For AT&T + 5.8775510 = 6.3997439% of the Public MPE limit allowed by FCC rules. This worst -case calculated exposure level is well below the 100% FCC limit. The actual exposure conditions are likely to be many times less than this worst -case value. AT&T Site WA6358 — Lake Ballinger MH Project #: 220003900 III FCC COMPLIANCE The general population/uncontrolled exposure near this facility, including persons at ground level, surrounding properties, inside and on existing structures will have RF exposure much lower than the "worst case" scenario, which is a small fraction of the MPE limit. Only, trained personnel will be allowed to access the AT&T antennas and equipment for maintenance operations. It shall be the responsibility of AT&T and/or its contractors to provide adequate occupational training making employees fully aware of the potential for RF exposure, and to exercise control over their exposure that is within their occupational/controlled limits. The FCC has determined that at sites where multiple wireless facilities are co -located, the responsibility for site -wide RF safety compliance is the shared responsibility of all licensees whose facilities produce exposure conditions greater than 5% of the applicable MPE exposure limit. Thus a new applicant is responsible for compliance (or submitting an environmental assessment) at a multiple -facility site only if the proposed facility, when considered alone, would produce exposure conditions in excess of 5% of the MPEs. Wireless facilities that produce less than 5% of the applicable MPE exposure limit at accessible locations are considered to be exempt from further study. As demonstrated in this report by worst -case exposure calculations, the proposed AT&T facility is part of a multiple wireless facility, and will produce far less than 5% of the applicable exposure limit for public environments. Therefore, pursuant to the Commission's rules no further calculations, measurements or other RF studies are required, and the proposed AT&T facility is presumed to be in compliance with the FCC's RF exposure rules. Because the proposed AT&T facility is in compliance with federal rules, it is also in compliance with local regulations concerning RF exposure. The following is the complete text of 47 U.S.C. § 332(c) (7) (B) (IV): "No State or local government or instrumentality thereof may regulate the placement, construction, or modification of personal wireless service facilities on the basis of the environmental effects of radio frequency emissions to the extent that such facilities comply with the Commission's regulations concerning such emissions. AT&T Site WA6358 — Lake Ballinger ■ MH Project #: 220003900 7- CONCLUSIONS Based on these calculations, the proposed WCF will comply with current FCC and local rules and guidelines regarding human exposure to radio frequency electromagnetic fields. This conclusion is based solely on the comparison of predicted RF conditions in specific areas with the corresponding safe exposure limits set forth in the FCC rules. The FCC exposure limits are based on recommendations by federal and private entities with the appropriate expertise in human safety issues. To avoid any misunderstanding, I hereby state that, to the best of my knowledge, belief and professional judgment, this report represents an accurate appraisal of exposure to RF EM fields based upon careful evaluation to the extent reasonably possible. Respectfully Submitted For the Firm, apV / '� M. ASI�CEG �P OF W V. 52513 �GISTER�� ` 0NAL Jason Ceglia, PE Morrison Hershfield Corp. AT&T Site WA6358 — Lake Ballinger MH Project #: 220003900