18 Morgan Suite 200
Irvine, CA 92618
www.mobilenet.net
Report Date: 10/19/2022
RF Emissions Compliance Report
SITE – CA002_CLC_CULVER_010 • 11317 Washington Pl, Culver City, CA 90066
Prepared For - Crown Castle, 200 Spectrum Center Drive. Irvine, CA - 92618
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Executive Summary
Crown Castle has contracted MobileNet Services to evaluate the Radiofrequency Electromagnetic Compliance of the proposed site below. Compliance is based on the Federal Communication Commission (FCC) Rules and Regulations for human exposure to electromagnetic fields.
Site Name: CA002_CLC_CULVER_010
Latitude: 34.007113°
Longitude: -118.416993°
Structure Type: Metal Streetlight Pole
Address: 11317 Washington Pl, Culver City, CA 90066
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FCC RF Exposure Guidelines
The Federal Communications Commission (FCC) has provided standards (FCC 96 -326) for RF exposure which are derived from recommendations of two expert organizations, the National Council on Radiation Protection and Measurements (NCRP) Section 17.4.5 Report No. 86 and the Institute of Electrical and Electronics Engineers (IEEE) Sections 4.2.1 and 4.2.2 C95.1 -1992. The FCC consulted with the Environmental Protection Agency (EPA), the Food and Drug Administration (FDA), and the Occupational Safety and Health Administration (OSHA) and obtained their support for the guidelines that the FCC is using. The exposure guidelines incorporate prudent margins of safety.
The FCC has classified Radio Frequency ( RF) exposure limits into two tiers - General Population or “Uncontrolled Environment” and Occupational or “Controlled Environment”. These limits apply to accessible areas where workers or the general public may be exposed to RF electromagnetic fields. The General Public limits are generally five times more restrictive than the Occupational limit.
• General Population/Uncontrolled – Exposure l imits apply in situations in which the general public may be exposed, or in which persons that are exposed as a consequence of their employment may not be fully aware of the potential for exposure or cannot exercise control over their exposure. • Occupational/Controlled – Exposure limits apply in situations in which persons are exposed as a consequence of their employment and are fully aware of the potential for exposure and can exercise control over their exposure.
Maximum Permissible Exposure (MPE) – FCC OET Bulletin 65 Table 1 of 47 C.F.R. § 1.1310
where f = frequency in MHz
In situations where the predicted MPE exceeds the General Population threshold in an accessible area because of emissions from multiple transmitters, FCC licensees that contribute greater than 5% of the aggregate MPE share responsibility for mitigation per 47 C.F.R § 1.1307(b)(3).
Frequency Range Occupational Exposure Limit Averaging Time Public Exposure Limit Averaging Time 30-300 MHz 1 mW/cm² 30 mins. 0.2 mW/cm² 6 mins.
300-1500 MHz f/300 mW/cm² 30 mins. f/1500 mW/cm² 6 mins. 1500-100,000 MHz 5 mW/cm² 30 mins. 1 mW/cm² 6 mins.
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Analysis
Based on the provided information from Crown Castle the proposed site will contain (3) 5G Antenna/Radio integrated units mounted atop a metal streetlight pole in the public right -of-way located in Culver City, CA. The predictive RF power density resulting from each transmitter at any location is expressed as a percentage of the FCC limit. It is assumed that all antenna specified channels are transmitting simultaneously, and that the radio transmitters are operating at maximum power. As predicted by RoofMaster™ the MPE values for both ground and antenna level are shown in the table below.
Maximum Permissible Exposure (MPE) at Ground/Generally Accessible Areas & Antenna Level
From Figure 2 in the Elevation Detail Plots the following keep-back distances to the FCC limits can be determined as follows:
Distance to FCC 100% MPE Limits at the Antenna Level
• Vertical Stand-off Distance (General Population) 3.71 feet • Vertical Stand-off Distance (Occupational Population) N/A • Horizontal Stand-off Distance (General Population) 5.26 feet • Horizontal Stand-off Distance (Occupational Population) N/A
Distance to FCC 100% MPE Limits at Ground Level
• Horizontal Stand-off Distance (General Population) N/A • Horizontal Stand-off Distance (Occupational Population) N/A
Reference Plane Maximum Level:
General Population (%)
Maximum Level:
Occupational (%)
Ground Level 0.14 0.03
Antenna Level 368.21 73.64
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Elevation Detail
Figure 1:Predicted MPE shown at the center of a 6-foot vertical space that a person could occupy at ground level
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Figure 2: Enlarged view of Antenna Level MPE limits
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Figure 3: Top-Down View at Antenna Level MPE limits
Antenna Inventory
Antenna
Number Antenna ID Operator Antenna
Mfg Antenna Model Freq
(MHz)
Azimuth
(deg)
Tilt
(deg)
HBW
(deg)
Aper
(ft)
TPO
(W) Paths Loss
(db)
Antenna
Gain (dbd)
EIRP
(W)
RC AGL
(ft)
1 1 Verizon ERICSSON SON SM6705 CM1 02.07.22 28GHz VZW28000 0 0 4 1.3 0.3 4 0 26.14 809 36.4 2 2 Verizon ERICSSON SON SM6705 CM1 02.07.22 28GHz VZW28000 120 0 4 1.3 0.3 4 0 26.14 809 36.4 3 3 Verizon ERICSSON SON SM6705 CM1 02.07.22 28GHz VZW28000 240 0 4 1.3 0.3 4 0 26.14 809 36.4
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Evaluation
Ground Level - For any person standing at accessible areas such as the ground level, calculations resulted in exposure levels well below (< 1%) the FCCs General Population MPE limit.
Antenna Level – Any areas exceeding 100% of the General Population Limits are displayed as Blue. As seen in Figures 1 and 2 the FCC's general population limit maybe exceeded within 6ft of the antenna. Any personnel accessing the pole and working within the area exceeding 100% of the limit should coordinate with the wireless operator or work should be performed by personnel trained in proper RF safety. Any work on the pole where the area is displayed as either Green or shows no color does not exceeding hazardous exposure levels and requires no action to maintain a safe working environment.
RF Signage Recommendation
For the facility to be classified as Occupational/Controlled environment the following actions are recommended in accordance with the FCC's and Crown Castle's RF safety guidelines:
• Install NOTICE sign(s) near the bottom of the pole or on the shroud any time there is a zone near the antenna that exceeds the General Population limit. This sign should be mounted where it is easily visible to workers on the ground as they approach the pole. Recommend placing on pole about 7-9’ from the ground level.
• Install CAUTION sign(s) on or near the antenna(s) with a Keep Back Distance of 6ft. Keep Back distance must be filled in on the sign. This sign must be mounted on or just below the radiating antenna where it is visible to workers approaching the antenna in a lift or bucket truck. Recommend placing on pole at 29ft from ground level.
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Figure 4: RF Signage Recommendation
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Calculation Methodology
MobileNet Services has performed theoretical modeling using RoofMaster™ developed by Waterford Consultants, LLC to predict the overall maximum permissible exposure (MPE) possible at any particular location given the spatial orientation and operating parameters of multiple RF sources . The input data for the calculations is based u pon information provided by the client.
RoofMaster™ predictive models comprise of the Far Field model as specified in OET -65 as well as use of the OET -65 Cylindrical Model (Sula09). These models utilize several operational specifications for different types of antennas to produce a plot of spatially averaged power densities that can be conveyed as a percentage of the applicable exposure limit.
The power density in the Far Field of an RF source is described by OET-65 Equation (4) as the following equation:
𝑆 =
𝐸𝐼𝑅𝑃
4⋅𝜋⋅𝑅2 (𝑚𝑊 𝑐𝑚2⁄ ),
where EIRP is the Effective Radiated Power relative to an isotropic antenna and R is the distance between the antenna and the point of study. At any location, the predicted power density in the Far Field is the spatial averaging of points within a 0-to-6-foot vertical space that a person would occupy.
The Near field power density is described by OET-65 Equation (20) is represented as the following equation:
𝑆 = (
180
𝜃𝐵𝑊
) ∙
100∙𝑃𝑖𝑛
𝜋∙𝑅∙ℎ (𝑚𝑊 𝑐𝑚2⁄ ),
where 𝑃𝑖𝑛 is the power input to the antenna , ℎ is the aperture length and 𝜃𝐵𝑊 is the beam width of the antenna in degrees.
Conclusion
The proposed site will be COMPLIANT with the FCC guidelines limiting public exposure to RF energy. 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 RF exposure levels from the proposed site will be well below the maximum permissible levels and complies with Radiofrequency Radiation Exposure Limits of 47 C.F.R § 1.1307(b)(3) and 47 CFR § 1.1310.