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Draft text amendments would set low‑frequency noise standard, decommissioning bond and generator rules for data centers
Summary
Planning commissioners and environmental commissioners discussed drafting text amendments that would require C‑weighted measurements for low‑frequency noise with a 55 dB limit at 300 Hz and below, a decommissioning plan with a surety bond, and limits on generator testing hours and emission tiers.
A planning commission member presented a set of draft text amendments intended to address specific community concerns about data centers: low‑frequency noise, decommissioning, truck noise during construction, generator testing and emission standards. On low‑frequency sound the draft calls for measurements for frequencies 300 hertz and below using C‑weighted sound meters and a 55 dB maximum ‘‘at the borders of the data center site and also at the property lines of the nearest residence,’’ the draft states.
The same speaker proposed that site plans include a decommissioning plan backed by a surety bond to ensure demolition and site restoration if a facility is abandoned, plus traffic‑management and highway‑damage bonds during construction. On generator emissions the draft cites U.S. EPA Tier 4 final emission standards and proposes limiting generator testing to weekdays between 10 a.m. and 4 p.m. Commissioners and environmental commissioners discussed whether wording should prohibit modified older generators and how to define enforceable monitoring.
Why it matters: The proposals are tangible regulatory options the county can adopt through text amendments; supporters said they could mitigate key risks raised by residents, while skeptics pointed out enforceability and technical measurement issues that would require expert drafting and definition.
