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CHAPTER 63 - LOT DEVELOPMENT STANDARDS

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63.640 VIBRATION

Vibration, as used in this ordinance, refers to ground transmitted oscillations.  For the purposed of identifying and measuring different types of vibration, the following definitions shall apply:  

1. “Amplitude”:  The maximum displacement of the surface of the earth from its normal resting position.  Amplitude is generally measured in inches or mils.
2. “Discrete Impulses”:  A ground transmitted vibration stemming from a source where specific impulses do not exceed sixty (60) per minute or one (1) per second.
3. “Frequency”:  The number of times that a displacement completely repeats itself in one (1) second of time.  Frequency shall be expressed in cycles per second (cps) or hertz (Hz).
4. “Impact”:  An earthborn vibration generally produced by two or more objects striking each other so as to cause separate and distinct pulses.

63.641

Ground transmitted vibration shall be measured at the point of measurement using a seismograph or complement of instruments capable of recording vibration displacement and frequency, particle velocity, or acceleration simultaneously in three mutually perpendicular directions.

63.642

Vibration shall not exceed the following levels:  

Maximum Peak Particle Velocity in Inches per Second	When the Lot is Adjacent to:
0.02 (7 a.m. - 9 p.m.) 0.01 (9 p.m. - 7 a.m.)	R-1, R-1x, R-2, R-3, R-4, MRD, and Developing Residential Areas
0.05	B-1, B-4, M-1, CDC
0.10	M-2

63.643

The maximum particle velocity shall be the maximum vector sum of three (3) mutually perpendicular components recorded simultaneously.  Particle velocity may also be expressed as six and twenty-eight hundredths (6.28) times the displacement in inches multiplied by frequency in cycles per second.  Steady state vibrations are ones which are continuous or in discrete impulses of more than sixty (60) per minute.  Discrete impulses which do not exceed sixty (60) per minute shall be considered impact vibrations.  Impact vibrations are limited to values which are no greater than twice those specified above.



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