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Blast Vibration Analysis: Proposed MMRR Quarry <br />Page 10 <br />With a potential range of vibration frequencies ranging from 10-100 Hz, determining the actual <br />frequency of the blast induced vibration prior to onset of quarry operations is difficult if not <br />impossible. A theoretical analysis of a structure's natural frequencies can determine its resonant <br />frequencies and responses. However, from a practical standpoint, a structure's natural frequencies <br />are unknown until it is excited in some way. Unfortunately, in this case determining the actual <br />response through a series of initial blasts based on the Scaled Distance Formula may result in 1) <br />impairment to highway lighting with resulting adverse impacts to the public safety of vehicles <br />traveling on Highway 119 and 2) potential repair and replacement expenses for the District. <br />©Leonard Rice Engineers, Inc. November 10, 2005 -Job No. 1086BCS03D <br />