42-22 Performance Standards Regulating Vibration
For the purposes of this Section, the following terms are defined:
Frequency
A "frequency" is the number of oscillations per second of a vibration.
Impact vibrations
"Impact vibrations" are earth-borne oscillations occurring in discrete pulses at or less than 100 pulses per minute.
Steady state vibrations
"Steady state vibrations" are earth-borne oscillations that are continuous. Discrete pulses that occur more frequently than 100 times per minute shall be considered to be steady state vibrations.
Three-component measuring system
A "three-component measuring system" is a device for recording the intensity of any vibration in three mutually perpendicular directions.
For the purpose of measuring vibration, a three-component measuring system approved by the Commissioner of Buildings shall be employed.
In all Manufacturing Districts, no activity shall cause or create a steady state vibration at any point on any lot line, with a displacement in excess of the permitted steady state vibration displacement for the frequencies as set forth in the following table for the district indicated.
MAXIMUM PERMITTED STEADY STATE VIBRATION DISPLACEMENT
(in inches)
District | |||
Frequency | M1 | M2 | M3 |
10 and below | .0008 | .0020 | .0039 |
10 - 20 | .0005 | .0010 | .0022 |
20 - 30 | .0003 | .0006 | .0011 |
30 - 40 | .0002 | .0004 | .0007 |
40 - 50 | .0001 | .0003 | .0005 |
50 - 60 | .0001 | .0002 | .0004 |
60 and over | .0001 | .0001 | .0004 |
In all Manufacturing Districts, no activity shall cause or create an impact vibration, at any point on any lot line, with a displacement in excess of the permitted impact vibration displacement for the frequencies as set forth in the following table for the district indicated.
MAXIMUM PERMITTED IMPACT VIBRATION DISPLACEMENT
(in inches)
District | |||
Frequency (cycles per second) | M1 | M2 | M3 |
10 and below | .0016 | .0040 | .0078 |
10 - 20 | .0010 | .0020 | .0044 |
20 - 30 | .0006 | .0012 | .0022 |
30 - 40 | .0004 | .0008 | .0014 |
40 - 50 | .0002 | .0006 | .0010 |
50 - 60 | .0002 | .0004 | .0008 |
60 and over | .0002 | .0002 | .0008 |
Whenever an M2 or M3 District adjoins a Residence District, the steady state and impact vibration displacement, measured at the district boundary, shall not exceed the maximum permitted for an M1 District for the frequencies as set forth in the tables in Section 42-223 (Maximum permitted steady state vibration displacement) or Section 42-224 (Maximum permitted impact vibration displacement).