No vibration is permitted which is discernible to human sense of feeling for three minutes or more duration in any one hour of the day between the hours of 7:00 a.m. and 7:00 p.m., or of 30 seconds or more duration in any one hour between the hours of 7:00 p.m. and 7:00 a.m. No vibration at any time shall produce an acceleration of more than 0.1g or shall result in any combination of amplitudes and frequencies beyond the "safe" range of Table 7, U.S. Bureau of Mines Bulletin No. 442, "Seismic Effects of Quarry Blasting," on any structure. The methods and equations of said Bulletin No. 442 shall be used to compute all values for the enforcement of this regulation.
(Ord. passed 10-30-06)