The following words, phrases and terms as used in this article shall have the following meanings:
"Acoustic specialist"means a person or persons trained in acoustic sampling, qualified to measure sound levels consistent with criteria contained within this article.
"Ambient sound level"means the composite of normal or existing sound from all sources measured at a given location for a specified time of the day or night. The ambient sound level shall be measured with a sound level meter, using slow response and "A" weighting. The ambient sound level shall be determined with the sound source at issue silent.
"Approving authority"means the designated body or persons authorized to grant approval or deny a discretionary permit or an exception to this article.
"A-weighting"means the standard A-weighted frequency response of a sound level meter, which de-emphasizes low and high frequencies of sound in a manner similar to the human ear for moderate sounds.
"C-weighting"means the standard C-weighted frequency response of a sound level meter, which de-emphasizes high frequencies of sound in a manner similar to the human ear for relatively loud sounds.
"Decibel"means a unit for measuring the relative amplitude of sound equal approximately to the smallest difference normally detectable by the human ear, whose range includes approximately 130 decibels on a scale beginning with zero decibels for the faintest detectable sound. The sound pressure associated with zero decibels is 20 micropascals.
"Discretionary permit"means a permit issued by the county other than ministerial permits, including but not limited to conditional use permits, tentative subdivision maps, design review permits and administrative permits.
"Enforcement officer"means the Placer County sheriff, the planning director, and/or the health officer and the employee(s) designated by the sheriff, the planning director, and/or the health officer as code enforcement officer(s) to enforce the provisions of this article.
"Equivalent hourly sound level (L eq)"means the sound level corresponding to a steady state A-weighted sound level containing the same total energy as the actual time-varying sound level over a one-hour period.
"Fixed sound source"means a device or machine which creates sounds while fixed or stationary, including but not limited to residential, agricultural, industrial and commercial machinery and equipment, pumps, fans, compressors, air conditioners and refrigeration equipment, also includes motor vehicles operated on private property.
"Impulsive sound"means a single noise event or series of single noise events, which result in a high peak sound level of short duration (less than one second). Examples include, but are not limited to guns shots, blasting, or hammering.
"Intruding sound level"means the sound level created, caused, maintained or originating from an alleged offensive source, measured in decibels, at a specified location while the alleged offensive source is in operation.
"Motor vehicle"means any vehicle that is propelled by other than human or animal power on land.
"Noise"means any loud discordant or disagreeable sound or sounds.
"One-third octave band"means a band of frequencies, in hertz (Hz), which is one-third of an octave wide. The center frequencies of one-third-octave bands increase by a factor of 1.26 (cube root of 2). Examples ozone-third octave band center frequencies in the range of audible sound include 20, 25, 31.5, 40 and 63 hertz. Describing sound pressure levels in one-third octave bands provides information as to the tone or pitch, of noise (low frequency versus high frequency), as well as the amplitude of the sound.
"Pleasure motor boat"means any boat which is powered by an in-board, out-board or in-board/out-board motor and is used for recreational purposes, including boats that are or may be used commercially to support recreational use. This includes, but is not limited to, commercial fishing and sightseeing. A vessel competing in a regatta, boat race, or trial runs pursuant to the terms of a duly authorized government permit shall not be considered a "pleasure motor boat" for purposes of this article.
"Property line or plane"means a vertical plane including the property line that determines the property boundaries in space.
"Public property"means any property owned by a public agency and held open to the public, including but not limited to parks, streets, sidewalks, and alleys.
"School"means institutions conducting regular academic instruction at preschool, kindergarten, elementary, secondary or collegiate levels.
"Sensitive receptor"means a land use in which there is a reasonable degree of sensitivity to noise. Such uses include single-family and multi-family residential uses, frequently used outbuildings, schools, hospitals, churches, rest homes, cemeteries, public libraries and other sensitive uses as determined by the enforcement officer.
"Simple tone noise"means any sound that is distinctly audible as a single pitch (frequency) or set of pitches. Includes sound consisting of speech and music.
"Sound level"means the sound pressure level in decibels as measured with a sound level meter using the A-weighting and C-weighting networks or one-third-octave band frequency. The unit of measurement is referred to herein as dBA, dBC or one-third octave band.
"Sound level meter"means an instrument meeting American National Standard Institute standard S1 .4A-1985 for Type 1 or Type 2 sound level meters or an instrument and the associated recording and analyzing equipment that will provide equivalent data.
(Ord. 5280-B, 2004)