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TABLE 2.05.3(6)(a) -1 <br />AIR -BLAST LIMITS <br />Low - Frequency Limit of Measuring Maximum Level <br />System, in Hz ( ±3dB) in dB <br />0.1 Hz or lower -Flat response 134 peak <br />2 Hz or lower - Flat response 133 peak <br />6 Hz or lower - Flat response 129 peak <br />C - Weighted, Slow response 105 C <br />NHN Mine seismographs record at the 2Hz or lower level. <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 =(D /Ds )2 <br />Section 2.05.3(6)(a) Page 11 February 2012 <br />