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"_.2009-89_. AN ORDINANCE TO REPEAL THE PRESENT SECTION 24-255 OF THE CODE OF THE CITY OF PORTSMOUTH (2006) AND TO REPLACE IT WITH A NEW SECTION 24-255 PERTAINING TO UNLAWFUL EXCESSIVE SOUND. BE IT ORDAINED by the Council of the City of Portsmouth, Virginia: 1. That the presel1tSection 24-255, entitled "Loud disturbances and unnecessary noise or sound," of the Code of the City of Portsmouth, Virginia (2006) be, and hereby is, repealed: 2. That a new Section 24-255, entitled "Unlawful Excessive Sound," be, and hereby is adopted to read as follows: Section 24-255. Unlawful Excessive sound. (a) Excessive Sound Prohibited. It shall be unlawful for any person to create excessive sound, as described in this section. (b) Definitions. The following terms shall have the meanings indicated, for purposes of applying and enforcing this section: Calibrator. A scientific device that is commonly used for the purpose of calibrating sound meters. dBA. The sound pressure level in decibels as measured on a sound level meter using the A- weighting network. Sound. An oscillation in pressure, particle displacement, particle velocity or other physical parameter, in a medium with internal forces that cause compression and rarefaction of that medium. The description of sound may include any characteristics of such sound, including duration, intensity and frequency. Sound level. The weighted sound pressure level obtained by use of a sound level meter and frequency weighting network, such as A, B or C as specified in the American National Standards Institute specifications for sound level meters (ASA 47-1983, or a later revision thereof). If the frequency weighting employed is not indicated, the A-weighting shall apply. Sound level meter. An instrument which includes a microphone, amplifier, RMS detector, integrator or time averager, output meter and any applicable weighting network used to measure sound pressure levels. Zone. Any reference to property being in a particular "zone" shall mean the zoning district category of the property, as per Chapter 40 of this Code.