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<br />Low-Frequency Limit of Measuring <br />System, in Hz (f3dB) <br />0.1 Hz or lower -Flat response <br />2 Hz or lower -Flat response <br />6 Hz or lower -Flat response <br />C -Weighted, Slow response <br />New Horizon Mine seismographs record at the 2Hz or lower level. <br />Maximum Level <br />in dB <br />134 peak <br />133 peak <br />129 peak <br />105 C <br />MAXIMUM PEAK PARTICLE VELOCITY LIMITS <br />Distance (D) Maximum Allowable Scaled-Distance <br />from the Blasting Site Peak Particle Factor to be <br />(in feet) Velocity (V max) Applied without <br />for Ground Vibration Seismic Monitoring <br />(In inches/second +) (Ds++) <br />0-300 1.25 50 <br />301 to 5000 1.00 55 <br />5001 and beyond 0.75 65 <br />+ Ground velocity shall be measured as the particle velocity. Peak particle velocity shall be <br />recorded in three mutually perpendicular directions from the blasting site. The maximum peak <br />particle velocity shall be the largest of any of the three measurements. <br />++ Applicable to the scaled-distance equation of paragraph 4.08.4(10)(c)(i) W=(DIDs )2 <br /> <br />(Revised 12 Nav 2002) <br />TABLE 2.05.3(b)(a)-1 <br />AIR-BLAST LIMITS <br />2.05.3(6)(a) 12 <br />