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900 feet from the closest anticipated blasting areas and should be clear of any <br /> damaging f/yrock that would result from a properly designed and implemented <br /> blasting plan. <br /> 4. Please commit to conducting a pre-blast survey of all permanent man-made <br /> structures which have the potential to be impacted by blasting operations. <br /> Response: <br /> The blasting specifications will require pre-blast condition surveys of all permanent <br /> man-made structures which have the potential to be impacted by blasting <br /> operations. An abandoned single-family residence located just across South St. <br /> Wain Creek is believed to be the only man-made structure within half a mile of the <br /> quarry. The structure was heavily impacted by the 2013 flood and it is our <br /> understanding that the structure is currently uninhabitable. <br /> 5. Please provide the Division with the proposed maximum peak particle velocities <br /> in inches/second based on the distance from the blast site to all structures within <br /> one mile of the blast location. <br /> Response: <br /> The blasting specifications will limit the maximum peak particle velocity to 1.0 inch <br /> per second at the permit boundary and at all permanent structures within one mile <br /> of the blast location. <br /> 6. Please commit to recording the peak particle velocities in three mutually <br /> perpendicular directions from the blasting site. The maximum peak particle velocity <br /> shall be the largest of any of the three measurements. <br /> Response: <br /> The blasting specifications will require blast monitoring equipment to be 4-channel <br /> units capable of measuring overpressure and vertical, longitudinal and transverse <br /> directions of ground vibration velocities. Peak Particle Velocity will be defined as <br /> the maximum of the three measured ground vibration velocities. <br /> 7. Please describe how the air overpressure (air blast) and noise will be measured. <br /> In addition, provide the Division with the lower frequency limit of the planned <br /> measuring system in Hertz (Hz) and the maximum level in decibels (dB) for each <br /> frequency limit. <br /> 3 <br /> hdrinc.com <br /> 1670 Broadway, Suite 3400,Denver,CO 80202-4824 <br /> (303)764-1520 <br />