18 Morgan Suite 200
Irvine, CA 92618
www.mobilenet.net
Report Date: 10/23/2023
RF Emissions Compliance Report
SITE – SCL Culver 13 • 4604 Sepulveda Blvd. Culver City, CA 90230
Prepared For
Crown Castle
200 Spectrum Center Drive. Irvine, CA - 92618
Irvine, CA • 949-951-4444 Page 3
Proprietary & confidential
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: SCL Culver 13
Latitude: 34.001845°
Longitude: -118.404724°
Structure Type: Wooden Utility Pole
Address: 4604 Sepulveda Blvd. Culver City, CA 90230
Irvine, CA • 949-951-4444 Page 4
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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 limits 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).
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Analysis
Based on the information provided by Crown Castle, the proposed site will contain a single canister type antenna with accompanying remote radio units mounted on an existing wooden utility pole in the public right-of-way of Culver City, California. 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 maximum permissible exposure (MPE) values for both ground and antenna levels as well as any other applicable reference planes are shown in the table below.
From all provided and gathered information there are currently no existing neighboring transmitters that contribute to the MPE levels for SCL Culver 13. The predictive exposure levels listed below are solely based on the proposed equipment for said site and should be mitigated accordingly.
Maximum Permissible Exposure (MPE) at Ground Level/General Public Accessible Areas & Antenna Level Reference Plane
Maximum Permissible
Exposure (MPE) Level:
General Population (%)
Maximum Permissible
Exposure (MPE) Level:
Occupational (%)
Ground Level 0.63 0.13
Antenna Level 1834.97 366.99
From Figure 2 in the Elevation Detail Plots, the following keep-back distances to the FCC limits is determined to be as follows:
Distance to FCC 100% MPE Limits at the Antenna Level
• Vertical Stand-off Distance (General Population) 4.6 feet • Vertical Stand-off Distance (Occupational) 2.9 feet
• Horizontal Stand-off Distance (General Population) 15.8 feet • Horizontal Stand-off Distance (Occupational) 6.1 feet
Distance to FCC 100% MPE Limits at Ground Level
• Horizontal Stand-off Distance (General Population) n/a • Horizontal Stand-off Distance (Occupational) n/a
Irvine, CA • 949-951-4444 Page 6
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Elevation Detail
Figure 1: Predicted MPE level in relation to the center of a 6-foot vertical space that a person(s) can occupy at Ground Level
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Figure 2: Top-Down Detailed view at Antenna Level
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Figure 3: Top-Down Detailed view at Ground Level
Antenna Inventory
Antenna
Number Antenna ID Operator Antenna Mfg. Antenna Model Freq. (MHz)
Azimuth
(deg) Tilt (deg) HBW (deg)
Antenna
Aperture
(ft)
TPO (W)
per Path Paths TPO (W) Loss (db) Antenna
Gain (dbd) EIRP (W) ERP (W)
RAD
Center
AGL (ft)
1 1 Verizon Wireless AMPHENOL 2C4U6VT360X06Fwxys5-T02 1900 1900 0 0 100 2.00 30 2 60 0 5.44 344 210 32.0 1 2 Verizon Wireless AMPHENOL 2C4U6VT360X06Fwxys5-T02 2100 2100 0 0 134 2.00 30 2 60 0 6.10 400 244 32.0 1 3 Verizon Wireless AMPHENOL 2C4U6VT360X06Fwxys5-T02 3700 3700 0 0 175 2.00 40 8 320 0 7.18 2742 1671 32.0
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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 the FCCs General Population MPE limit.
Adjacent Building Level - For any person standing at accessible areas such as the adjacent buildings rooftop, calculations resulted in exposure levels well below the FCCs General Population MPE limit. No action is required to maintain a safe working environment.
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 may be exceeded within 16ft of the antenna at the horizonal distance and 7ft from the antenna at the vertical distance. 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 exceed 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’ above ground level (AGL).
• Install CAUTION sign(s) on or near the antenna(s) with the maximum Keep Back Distance of 16ft. 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 26ft above ground level (AGL) where the vertical General Population Limit is no longer exceeded.
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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 upon 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.