8.20.020 Standards and definitions.
A. Terminology and Standards. All terminology used in this chapter that is not defined below shall be in accordance with the American National Standards Institute (ANSI) Standard ANSI.
B. Measurement of Sound Level.
1. If the measurements are made with a sound level meter, it shall be an instrument in good operating condition, meeting the requirements of a Type I or Type II meter, as specified in ANSI Standard 1.4-1971. For purposes of this chapter, a sound level meter shall contain at least an A-weighted scale, and both fast and slow meter response capability.
2. If the measurements are made with other instruments, the procedure shall be carried out in such a manner that the overall accuracy shall be at least that called for in ANSI Standard 1.4-1971 for Type II instruments.
3. When the location or distance prescribed in this chapter for measurement of sound is impractical or would provide misleading or inaccurate results, measurements may be taken at other locations or distances using appropriate correction factors specified in this chapter or in other rules promulgated by the council.
4. Procedures and tests required by this chapter and not specified herein shall be placed on file with the city council.
C. Definitions. The following words shall have the meanings ascribed to them in this section:
“City” means the city of Maywood Park, Oregon, or the area within the territorial city limits of the city of Maywood Park, Oregon, and such territory outside of this city over which the city has jurisdiction or control by virtue of ownership or any constitutional or Charter provision, or any law.
“Construction” means any and all activity necessary or incidental to the erection, demolition, assembling, altering, installing, repair, or equipping of buildings, roadways, and utilities. It shall include land clearing, grading, excavating, and filling before, during, or following such activity.
Day-Night Noise Level. “LDN” means the noise level calculated from the following equation:
where:
LD+E is Leq between 7:00 a.m. and 10:00 p.m.
LN is Leq between 10:00 p.m. and 7:00 a.m.
“Emergency work” means work made necessary to restore property to a safe condition following a calamity, work required to restore public utilities, or work required to protect persons or property from imminent exposure to danger.
Equivalent Noise Level. “Leq” means the equivalent energy averaged sound level in decibels of the A-weighting network readings from a standard sound level meter for the period specified.
“Persons” means a person, persons, firm, association, co-partnership, joint venture, corporation, or any entity public or private in nature.
“Road vehicle” means any vehicle which is, or is designed to be, self-propelled or is designed or used for transporting persons or property on a public roadway.
“Sound level (dbA)” means the sound level in decibels measured using the A-weighting network as specified in ANSI S 1.4-1971 for sound level meters.
Time Periods.
a. “Night time period” means 10:00 p.m. of one day until 7:00 a.m. of the following day.
b. “Day time period” means 7:00 a.m. until 7:00 p.m. of the same day.
c. “Evening time period” means 7:00 p.m. until 10:00 p.m. of the same day.
d. “Any one hour” means any period of 60 consecutive minutes during the 24-hour day. [Ord. 14 § 2, 1976.]