1. Except as specifically provided for elsewhere in this Title, no person shall cause or permit sound to intrude into the property of another person which exceeds the limits set forth below in this Section.  For purposes of this Section, “day hours” shall be between 7 a.m. and 10 p.m., and “night hours” shall be between 10 p.m. and 7 a.m.
2. A.  The sound levels established are as set forth in Figure 1 before any adjustments are applied:
3. FIGURE 1
4. PERMISSIBLE SOUND LEVELS

5. (7:00 a.m.-10:00 p.m., otherwise minus five dBA)

1. B.  Adjustments to Figure 1.
   1. 1.   During night hours, the sound levels of Figure 1 must be reduced five dBA.
   2. 2.   During all hours, the sound levels of Figure 1 must be decreased five dBA for narrow band or steady sound (apply 1 only).
   3. 3.   The adjustments provided herein are cumulative.
2. C.  If a dwelling unit or noise sensitive receiver is in a nonresidential zone of the City, the nonresidential standard normally applies unless:
   1. 1.   a complaint is received, and
   2. 2.   the dwelling unit or noise sensitive receiver type use predates that of the noise source. In that case, the permissible sound level, as measured at the lot line of the dwelling unit or other noise sensitive receiver, is 65 dBA in a commercial/mixed use zone and 70 dBA in an employment or industrial zone, each subject to the adjustments of Subsections 18.10.010 B., F., and G.
3. D.  Nonconforming use: The maximum permissible sound level that may be emitted from any lot containing a nonconforming use is the same as that permitted for the most restrictive zone in which the use would be conforming.
4. E.  When a sound source can be identified and its sound measured in more than one zone, each of the appropriate Sections applies at the boundaries between zones.
5. F.   Impulse sound: Notwithstanding the sound levels of this Section, no person may cause or permit the operation of an impulsive noise source that has a peak sound pressure level in excess of 100 dB during day hours or 80 dB during night hours.
6. G.  Octave band measurements: When the Noise Control Officer makes a finding that the frequency characteristics of the sound are such that the A‑scale levels specified in Section 18.10.010 are inadequate to protect the public health, welfare, or safety, octave‑band sound pressure level measurements must be performed.
   1. 1.   Octave‑band measurements must be compared to the appropriate values indicated in Figure 2 for equivalent permissible dBA land use values; octave‑band sound pressure in excess of these standards will be considered evidence of a violation of this Title.

FIGURE 2

PERMITTED OCTAVE BAND SOUND PRESSURE LEVELS

FOR GIVEN PERMISSIBLE dBA SOUND LEVELS

1. When the permissible dBA level is:	The Maximum Octave Band Sound Pressure Levels Shall Not Exceed:
   -	Octave Band Center Frequency, in Hz
   -	31.5	63	125	250	500	1000	2000	4000	8000
   45	64	58	51	46	42	39	36	33	30
   50	65	62	56	50	46	43	40	37	34
   55	68	65	61	55	52	49	46	43	40
   60	72	68	64	60	56	54	51	48	45
   65	76	72	68	64	61	59	56	53	50
   70	79	76	72	69	66	64	61	58	55
   75	82	79	76	73	71	69	66	63	60

2. H.  When property of the receiver is unoccupied, as in the case of any undeveloped lot, sound levels in excess of those specified herein will be considered only as a technical violation of the standard. No citation will be issued in such instances, nor is corrective action required by the noise source.