(12/15/61)
(12/15/61)
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.
(12/15/61)
For the purpose of measuring vibration, a #three-component measuring system# approved by the Commissioner of Buildings shall be employed.
(12/15/61)
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# (cycles per second) |
M1 | M2 | M3 |
| 10 and below 10-20 20-30 30-40 40-50 50-60 60 and over |
.0008 .0005 .0003 .0002 .0001 .0001 .0001 |
.0020 .0010 .0006 .0004 .0003 .0002 .0001 |
.0039 .0022 .0011 .0007 .0005 .0004 .0004 |
(12/15/61)
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 10-20 20-30 30-40 40-50 50-60 60 and over |
.0016 .0010 .0006 .0004 .0002 .0002 .0002 |
.0040 .0020 .0012 .0008 .0006 .0004 .0002 |
.0078 .0044 .0022 .0014 .0010 .0008 .0008 |
(12/15/61)
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).