Portland City Code ch. 14

Citation: Portland City Code ch. 14 2.
Parent Document: Portland City Code ch. 14
Jurisdiction: Portland (municipal)
Original Source: https://www.portlandmaine.gov/asset/ae8cabd1-66eb-4a1c-9224-92bbca5e792f ↗

Full Text

3,976 chars

2. Rooftop appurtenances may exceed the on public streets, sound from temporary
maximum height limits of 45 feet providing activities such as festivals, sound created
that their design and placement is either as a result of, or relating to, an emergency,
fully screened or integrated into the including sound from emergency warning
architecture of the structure on which signal devices, and maritime navigation
they sit. signals.
3. The applicant must provide a 2. In measuring sound levels under this
determination from the Federal Aviation subsection, sounds with a continuous
Administration that structures and duration of less than 60 seconds shall be
equipment in excess of 45 feet will not measured by the maximum reading on a
exceed the applicable height guidelines for sound level meter set to the A weighted
the runway approach and will not create a scale and the fast meter response (L
conclusive evidence that the proposed maxfast). Sounds with a continuous
development will not create a hazard. duration of 60 seconds or more shall be
measured on the basis of the energy
10.2.8 Performance standards average sound level over a period of 60
Development in the Eastern Waterfront Port Zone seconds (LEQ1).
shall comply with the following standards: 3. In addition to the sound level standards
A. Outdoor storage of materials. Outdoor otherwise established, facilities or
storage of commodities and materials operations established or built in the
accessory to normal conduct of business shall EWPZ on or after July 1, 1988, shall employ
be entirely contained, including runoff best practicable sound abatement
contaminants and residual material, within a techniques to prevent tonal sounds and
designated area. impulse sounds or, if such tonal and
B. Noise impulse sounds cannot be prevented, to
1. The level of sound, measured by a sound minimize the impact of such sounds in
level meter with frequency weighting residential zones. Tonal sound is defined
network (manufactured according to as a sound wave usually perceived as a
standards prescribed by the American hum or which because its instantaneous
National Standards Institute, Inc.), sound pressure varies essentially as a
inherently and recurrently generated simple sinusoidal function of time. Impulse
within the EWPZ between the hours of sounds are defined as sound events
7:00 p.m. and 7:00 a.m. from facilities or characterized by brief excursions of sound
operations commenced on or after July 1, pressure, each with a duration of less than
1988, shall not exceed 55 decibels on the A one second.
scale at or within the boundaries of any C. Vibration. Vibration inherently and recurrently
residential zone, except for sound from generated shall be imperceptible without
construction activities, sound from traffic instruments at lot boundaries. This shall not 10-8 | CITY OF PORTLAND LAND USE CODE WATERFRONT ZONES

Other Sections in This Document (541)

Full Text