(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 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. No blasting operation will be permitted within 150 feet of any dwelling, building, school, church, theater or any structure which the Safety Director or City Seismologist may deem hazardous.
(1) Blasting operations conducted within the allowable limits of grounds motion and particle velocity contained in this section shall be considered structurally nondamaging to structures.
(2) 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.
(3) No blasting operations shall be permitted unless the City Seismologist is present.
(4) When the characteristics or environment of any specific blasting event have been determined to be extraordinarily hazardous by the City Seismologist and Safety Director, 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. 32-1975. Passed 3-24-75.)