Hemet's enforceable numeric noise limits are octave-band sound-pressure caps. Sec. 30-32(32) limits noise from C-M or M (commercial-manufacturing/industrial) zoned property onto residential property to 65 dB below 75 Hz down to 40 dB above 2,400 Hz. The General Plan also sets a 65 dBA exterior CNEL goal for residential land use.
The City of Hemet uses two kinds of numeric noise standards rather than a single residential dBA-by-hour table. First, the enforceable code limit is in Municipal Code Chapter 30, Article II, Section 30-32(32), which restricts electrical or mechanical sound or noise from any C-M or M zoned property projected onto residential property to a table of octave-band sound-pressure limits: 65 dB below 75 cycles per second, 60 dB for 75-150, 55 dB for 151-600, 45 dB for 601-2,400, and 40 dB above 2,400 cycles per second (re .002 microbar). Second, the General Plan Noise Element sets land-use compatibility goals measured in CNEL: a maximum exterior 65 dBA CNEL and interior 45 dBA CNEL for rural, single-family, and multi-family residential; 70 dBA exterior for commercial, industrial, and active recreation; and stricter interior limits for schools (45 dBA), libraries (50 dBA), and hospital sleeping areas (40 dBA). These CNEL figures are design/compatibility standards used in development review (Table II-F-4 of the 1992 General Plan), while the Sec. 30-32(32) octave-band caps are the directly enforceable industrial-to-residential limits. The zoning code (Sec. 90-1046) adds separate octave-band limits at M-1 and M-2 zone boundaries.
Industrial/commercial (C-M or M zoned) noise onto residential property exceeding the Sec. 30-32(32) octave-band limits is a code violation. General Plan CNEL standards are applied through development review and required noise studies rather than direct citation.
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