El Dorado County's General Plan Noise Element (Policy 6.5.1.7, Table 6-2) caps noise from stationary sources at a neighboring home. A data center's cooling and generators must stay at or below 55 dBA daytime and 45 dBA nighttime hourly Leq in Community areas, and 50/40 dBA in Rural areas.
El Dorado County has no standalone noise ordinance; the General Plan Public Health, Safety, and Noise Element governs non-transportation sources through use-permit and CEQA review. Policy 6.5.1.7 requires new non-transportation noise be mitigated to the Table 6-2 standards, measured at a neighboring noise-sensitive use. In Community Regions the limit is a one-hour Leq of 55 dBA daytime (7 a.m.-7 p.m.), 50 dBA evening, and 45 dBA at night (10 p.m.-7 a.m.); Rural Regions are 50/45/40 dBA. The standard applies at the receiving property line in Community areas, or 100 feet from a rural residence, and drops 5 dBA for pure-tone or impulsive noise. A data center's chillers and generator testing are reviewed against these limits.
Cooling or generator noise exceeding the Table 6-2 limits at a neighboring home violates the General Plan noise standards. The county requires mitigation as a permit condition, and unmitigated impacts can be conditioned or denied under CEQA.
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