Significant Noise Source: A significant
noise source is any individual item of equipment,
or group of equipment items, which collectively function
as an operating system, that generates an A-weighted
sound pressure level (SPL) equal to or in excess of
37 decibels (dBA), measured at 0.6 meters distance
from the noisiest part of the equipment.
Continuous Noise Source: A significant
noise source, which exists for a cumulative total
of eight hours or more in any 24-hour period, is considered
a continuous noise source.
Intermittent Noise Source: A significant
noise source, which exists for a cumulative total
of less than eight hours in any 24-hour period, is
considered an intermittent noise source.
Acoustic Reference: All sound pressure
levels in decibels are referenced to 20 micropascals.
