(A) In any district no activity or operation shall cause or create earthborne vibrations in excess of the displacement values given below.
(1) Measurements shall be made at or beyond the adjacent lot line or the nearest residence district boundary line, as described below.
(2) Vibration displacements shall be measured with an instrument or complement of instruments capable of simultaneously measuring in three mutually perpendicular directions. The maximum vector shall be less than the vibration displacement permitted. For the purpose of this ordinance, steady state vibrations are vibrations which are continuous or vibrations in discrete impulses more frequent than 100 per minute. Discrete impulses which do not exceed 100 per minute shall be considered impact vibrations.
(B) The maximum permitted displacements shall be determined in each district by the following formula:
D= | K | D=displacement in inches. |
f | K=a constant to be determined by reference to the following tables. | |
f=the frequency of the vibration transmitted through the ground expressed in cycles per second. |
(C) The maximum earth displacement permitted at the points described below shall be determined by use of the formula in the preceding division (B) and the appropriate K constant shown in Table 1.
Table 1: Values of K to be used in Vibration Formula | |
Location: | |
In any neighboring lot - | K |
Steady state | 0.008 |
Impulsive | 0.015 |
Less than 8 pulses per 24-hour period | 0.037 |
In any residence district - | |
Steady state | 0.003 |
Impulsive | 0.006 |
Less than 8 pulses per 24-hour period | 0.015 |
(Ord. 77-08, passed 6-28-77) Penalty, see § 157.999