(A) Table 1 designates the applicable lines of Table 2 that apply on or beyond adjacent lot lines within the zone, and on or beyond appropriate district boundaries. Vibration shall not exceed the maximum permitted particle velocities in Table 2. Where more than one set of vibration levels apply, the most restrictive shall govern. Readings may be made at points of maximum vibration intensity.
(B) (1) Districts shall be defined as in the County Zoning Ordinance as it is presently enacted or hereinafter modified as follows:
(a) R - Residential E1-2, RI-6;
(b) C - Commercial C1-6; and
(c) I - Industrial I1-3.
Table 1 | |||||
Applicable Lines of Table 2 | |||||
Emitting to | Lot Line Adjacent | District Boundaries | |||
From | R | C | I-1 | I-2, 3 | |
C | X | X | – | X | X |
I-1 | Z | X | Y | – | – |
I-2, 3 | – | X | Y | Z | – |
(2) The maximum permitted peak particle velocities that correspond to the above designations are as follows:
Table 2 | ||
Steady-State Vibration Limits | ||
Peak Particle Velocity (inches per second)
| ||
Vibration Limit | Daytime | Nighttime |
X | 0.03 | 0.01 |
Y | 0.06 | 0.06 |
Z | 0.26 | 0.20 |
(C) The maximum particle velocity shall be in 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 the frequency in Hertz (cycles per second).
(D) For purposes of this section, steady-state vibrations are vibrations which are continuous. Vibrations in discrete impulses more frequent than 60 per minute shall be considered impact vibrations.
(1980 Code, § 93.095) (Res. 94-229, passed 1-19-1995; Res. 99-210, passed 5-20-1999)