New Jersey Administrative Code › Title 19 - OTHER AGENCIES › NEW JERSEY MEADOWLANDS COMMISSION › Chapter 4 - DISTRICT ZONING REGULATIONS › Subchapter 7 - PERFORMANCE STANDARDS › Section 19:4-7.4 - Performance standards; vibrations

Current through Register Vol. 56, No. 14, July 15, 2024
(a) The
				  following words and terms, when used in this section, shall have the following
				  meanings, unless the context clearly indicates otherwise.
"Amplitude" means the maximum displacement of the earth
					 from the normal rest position. Amplitude is usually reported as inches or
					 mils.
"Discrete impulses" means a ground transmitted vibration
					 stemming from a source where specific pulses do not exceed 60 per minute or one
					 per second.
"Frequency" means the number of times that a displacement
					 completely repeats itself in one second of time. Frequency may be designated in
					 cycles per second (cps) or hertz (Hz).
"Impact" means an earthborn vibration generally produced by
					 two or more objects striking each other so as to cause separate and distinct
					 pulses.
"Particle velocity" means a characteristic of vibration
					 that depends on both displacement and frequency. If not directly measured, it
					 can be computed by multiplying the frequency by the amplitude times the factor
					 6.28. The particle velocity will be in inches per second, when the frequency is
					 expressed in cycles per second and the amplitude in inches.
"Steady state vibration" means a vibration which is
					 continuous, as from a fan, compressor, or motor.
"Vibration" means a reciprocating movement transmitted
					 through the earth, both in horizontal and vertical planes.
(b) Ground-transmitted vibration shall be
				  measured with a seismograph or complement of instruments capable of recording
				  vibration displacement and frequency, particle velocity, or acceleration
				  simultaneously in three mutually perpendicular directions.
(c) Table 7-2 below designates the maximum
				  permitted particle velocities, except as otherwise designated. Where more than
				  one set of vibration levels apply, the most restrictive shall govern.
				  Measurements may be made at points of maximum vibration intensity.
TABLE 7-2
Vibration Level Restrictions
Performance
Maximum Peak
Standard
Particle Velocity,
Category
inches per second
Where
						  Measured
A
0.02
On or beyond the subject
						  property
boundary line
B
0.05
On or beyond the subject
						  property
boundary line
C
0.10
On or beyond the zone
						  boundaries
(d) In any
				  residential area, the peak particle velocity shall not exceed 0.02 inches per
				  second during the hours of 7:00 A.M. to 9:00 P.M. and shall not exceed 0.01
				  inches per second during the hours of 9:00 P.M. to 7:00 A.M.
(e) The maximum particle velocity shall be
				  the maximum vector sum of three mutually perpendicular components recorded
				  simultaneously. Particle velocity may also be expressed as 6.28 times the
				  displacement in inches multiplied by frequency in cycles per second.
(f) For the purpose of these regulations,
				  steady state vibrations are vibrations which are continuous, or vibrations in
				  discrete impulses more frequent than 60 per minute. Discrete impulses that do
				  not exceed 60 per minute shall be considered impact vibrations. Impact
				  vibrations are limited to values no more than twice as high as those specified
				  in Table 7-2.