(a) Blasting operations shall be so conducted that ground vibrations measured at the nearest structure or building, except high-tension lines, supporting towers and appurtenances, do not exceed a peak particle velocity of two inches per second or its equivalent on any of the three mutually perpendicular planes of motion, i.e. vertical, longitudinal or transverse, and so that noise levels do not exceed a sound pressure level of 130 dB peak. No blasting operation shall be permitted adjacent to any structure which the Fire Chief or seismologist may deem hazardous.
(b) A record of the seismic wave pattern shall be kept for a minimum of three years after project completion by the seismologist, and such record shall be filed in the permanent records of the Director of Public Safety.
(c) No blasting shall be permitted unless the seismologist is present.
(d) When the characteristics or environment of any specific blasting event has been determined to be extraordinarily hazardous by the seismologist and/or the Fire Chief, additional safety precautions may be lawfully required. The permittee shall be advised of the nature of such extraordinary hazard and instructed as to what specific additional safety requirements are required.
(Ord. 1988-29. Passed 9-12-88.)