543.02 DEFINITIONS.

   For the purpose of this chapter the following terms, phrases, words and their derivations shall have meanings as follows:

   (a)   "Commercial property" or "commercial zone" means those properties included within districts established by Chapter 1123 of the Planning and Zoning Code and designated C-1 and C-2.

   (b)   "Decibel (dB)" means a unit of sound pressure measurement as defined by the American National Standards Institute Bulletin S1.4-1971. One decibel or a dB refers to a sound pressure of 0.0002 microbars.

   (c)   "dB(A)" refers to a weighted scale for measuring decibels as defined in the American National Standards Institute Bulletin S1.4-1971.

   (d)   "Frequency" means the number of fluctuations of pressure in one second of time. The unit of measurement is cycles per second (cps) or hertz (hz).

   (e)   "Industrial property" or "industrial zone" means those properties included within districts established by Chapter 1123 and designated M-1 and M-2.

   (f)   "Impact noise filter" means an instrument that may be used in conjunction with the sound level meter to measure peak intensities of short duration sounds.

   (g)   "Residential property" or "residential zone" means those properties included within districts established by Chapter 1123 and designated R-1, R-2 and R-3.

   (h)   "Sound level meter" means an instrument standardized by The American Standard Association and used for measurement of the intensity of sound and calibrated in decibels. Readings shall be made on a dB(A) scale.

   (i)   "Sound pressure" means the average rate at which sound energy is transmitted through a unit area perpendicular to a point in a specified direction.

   (j)   "Traffic noise" means sound made by a motor vehicle or vehicle operated either on the public right of way or private property.

      (1964 Code Sec. 99.02)

543.03 PROHIBITIONS; EXEMPTIONS.

   Any production, processing, cleaning, testing, repairing, moving or storing of materials, goods or products; sound amplification systems; motor vehicles; or sound emanating from other activities within the City, shall be so operated as to conform with the sound pressure level standards set forth in this chapter. Aircraft and municipal or other governmental equipment are exempt from the application of this chapter. Sound created by construction or building repair of any premises within the City shall be exempt from the application of this chapter during the hours of 7:00 a.m. to 8:00 p.m. Sirens, whistles, bells, etc., which are maintained and utilized solely to serve a public purpose (such as fire, ambulance, police, air raid or tornado warning sirens, church bells or chimes) shall be exempt from the application of this chapter.

(1964 Code Sec. 99.03)

543.04 METHODS OF MEASUREMENT.

   In measuring sound the following methods shall be used:

   (a)   A B & K Precision Sound Level Meter Type 2205 or equivalent shall be used to measure sound pressure dB(A).

   (b)   Points of measurement for stationary noise sources shall be on lot lines of the property on which the noise source is located. Points of measurement for traffic noise shall be on right-of-way lines of the public right of way or on lines of private property on which the motor vehicle or vehicles are operating or at a distance of fifty feet from the noise source, whichever is greater.

   (c)   For stationary noise sources, sounds shall be measured at no less than eight point on lot lines, the location of which shall be determined by the Building Inspector.

   (d)   For traffic noise sources, sounds shall be measured at a single point with not less than three readings from that point.

   (e)   Sounds of short duration, as from forge hammers, punch presses and metal shears, shall be measured with an impact noise filter that conforms to specifications published by the American Standards Association, in order to determine peak value of the impact.

      (1964 Code Sec. 99.04)

543.05 INDUSTRIAL PROPERTY ADJOINING RESIDENTIAL PROPERTY.

   Any activity located on property in an industrial zone adjoining a residential zone, whether open or enclosed, shall not exceed, at any point on or beyond any lot line, the maximum sound pressure level set forth in the table below:

Maximum Permitted Sound Pressure Level dB(A)

 

8:00 p.m.	6:00 a.m. to 8:00 a.m.	8:00 a.m
to		to
6:00 a.m.	6:00 p.m. to 8:00 p.m.	6:00 p.m.
55	60	62

(1964 Code Sec. 99.05)

543.06 INDUSTRIAL PROPERTY ADJOINING OTHER THAN RESIDENTIAL PROPERTY.

   Maximum permissible sound pressure level, dB(A) for any activity located on property in an industrial zone, whether open or enclosed, adjoining other than a residential zone shall not exceed seventy-two decibels dB(A).

(1964 Code Sec. 99.06)

543.07 COMMERCIAL PROPERTY ADJOINING RESIDENTIAL PROPERTY.

   Maximum permissible sound pressure level, dB(A) for any activity in a commercial zone adjoining a residential zone, whether open or enclosed, shall not exceed, at any point on or beyond any lot line, sixty-two decibels dB(A).

(1964 Code Sec. 99.07)

543.08 COMMERCIAL PROPERTY ADJOINING OTHER THAN RESIDENTIAL PROPERTY.

   Maximum permissible sound pressure level, dB(A), for any activity in a commercial zone, whether open or enclosed, adjoining other than a residential zone shall be an additional eight decibels plus eight dB(A).

(1964 Code Sec. 99.08)