Daly City's Municipal Code sets no decibel limit for a data center. Chapter 9.22 bars noise heard beyond your property line between ten p.m. and six a.m. The numeric targets sit in the 2030 General Plan Noise Element instead.
Chapter 9.22 of the Daly City Municipal Code is qualitative. Section 9.22.010 bars any noise, disorder, or tumult disturbing the public peace. Section 9.22.030 bars noise between ten p.m. and six a.m. that is heard beyond the property from which it emanates. No dBA table exists in the code. The 2030 General Plan Noise Element supplies the numbers the City applies in project review: Task NE-6.2 maintains 70 dBA Leq in residential areas, and Policy NE-5 maintains 75 dBA CNEL for office, commercial, and professional areas. Cooling and generator noise from a data center is conditioned through its Use Permit.
Noise heard beyond the property line between ten p.m. and six a.m. violates Section 9.22.030 and is enforced by police. A permitted data center also breaches its Use Permit conditions.
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