(a) Blasting operations shall be so conducted that ground vibrations measured at the nearest structure or building, neither quarry nor contractor owned or leased, except high-tension lines, supporting towers and appurtenances, do not exceed a peak article 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 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 City Seismologist may deem hazardous.
(1) A record of the seismic wave pattern shall be kept for a minimum of three years after project completion by the City Seismologist and the same shall be filed in the permanent records of this City.
(2) No blasting shall be permitted unless the City Seismologist is present.
(3) When the characteristics or environment of any specific blasting event have been determined to be extraordinarily hazardous by the City Seismologist and Fire Chief, additional safety precautions may be lawfully required.
(b) The permittee shall be advised of the nature of such extraordinary hazard and instructed as to what specific additional safety requirements are required.
(Ord. 1987-26. Passed 5-18-87.)