2016-07-14_PERMIT FILE - M2016010 (4)

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while waiting the required 30 minutes. This may include the access corridors and other facilities on the site. • If the investigation reveals the detonator can be re-used and re-shot,the blast area will be cleared again, blast guards reestablished, and the blast warning procedure will be reinitiated and the detonator blasted. • If the detonator cannot be re-used and blasted, the area will be secured and all mining personnel warned of the hazard. The area will be carefully excavated under the supervision of the lead blaster or quarry manager until the blasting cap and booster are located. Blast Monitoring Procedures— As part of Hitch Rack Ranch Quarry's blasting plan, all blasts will be monitored using several methods. They are as follows: • Blasts will be video recorded, if weather conditions permit. • Seismic instrument(s)will be used to measure ground vibration and peak particle velocity. The proposed maximum peak particle velocity will be one half(1/2) inch per second measured at the seismic instrument set up nearest to the closest structure. • Microphone(s)will be used to measure air over pressure (air blast)and noise. The proposed maximum decibel(dB) level for air over pressure will be 130 dB measured at the seismic instrument set up nearest to the closest structure. All blasts will be monitored with three separate monitoring units made up of a seismograph,geophone(seismic unit),and a microphone. The locations for these units are described below: • One stationary unit will be located at the western edge of the property in the location of the western gate along Little Turkey Creek Road. • The second relatively stationary unit will be located on the eastern edge of the property adjacent to the eastern gate along Little Turkey Creek Road or on the quarry access road. The location will be determined based on the closest structure to the blast. • The final monitoring unit will be placed perpendicular to each blast at or near the nearest property line. All blast monitoring will be completed by a blasting consulting firm that specializes in blast monitoring. Monitoring records will be kept onsite for each blast and will include: • The name of the person and monitoring firm recording and analyzing the seismographic record. • The type and manufacturer of the instrument • Sensitivity of the instrument • The date and certification of the last calibration of the instrument • The exact location of the instrument including the date,time,and distance from the blast • The recorded value of the peak particle velocity and air over pressure.