§ 32-12. Vibration regulations; blasting and ground motion.

The intensity of ground motion produced by blasting operations, either in construction or in operation of a business such as a quarry at a fixed location, whether or not such vibration or ground motion is emitted from a source within the City, when measurements are made on the ground next to the foundation or on the basement floor of any dwelling, church, school, or any other residential, commercial, or institutional structure located within the City, shall not exceed the following limits on particle velocity:

<15 Hz	0.1 in/sec (structural damage zone)
15-25 Hz	0.25 in/sec (mid-wall motion damage zone)
26-45 Hz	0.5 in/sec (human annoyance zone)
>>45 Hz	1.0 in/sec