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Low - Frequency Limit of Measuring <br />System, in Hz ( ±3dB) <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 />NHN Mine seismographs record at the 2Hz or lower level. <br />Distance (D) <br />from the Blasting Site <br />(in feet) <br />for Ground Vibration <br />(In inches /second +) <br />0 -300 <br />301 to 5000 <br />5001 and beyond <br />TABLE 2.05.3(6)(a) -1 <br />AIR -BLAST LIMITS <br />MAXIMUM PEAK PARTICLE VELOCITY LIMITS <br />Maximum Allowable <br />Peak Particle <br />Velocity (V max) <br />Seismic Monitoring <br />(Ds + +) <br />1.25 <br />1.00 <br />0.75 <br />Maximum Level <br />134 peak <br />133 peak <br />129 peak <br />105 C <br />Scaled- Distance <br />Factor to be <br />Applied without <br />50 <br />55 <br />65 <br />in dB <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 ) <br />Section 2.05.3(6)(a) Page 11 February 2012 <br />