Laserfiche WebLink
On the days of blasting, the quarry manager contacts the nearby residence that he has on his <br /> contact list and informs them of the intent to blast and gives them an approximate time of the blast. <br /> Seismic instrument(s) and microphones will be used for all blasts. Both the seismic instrument <br /> and microphone will be placed in the same location and will be located between the blast and the <br /> closest structure. If the closest structure is off the property,the instruments will be located next to the <br /> property line. Currently the home that is owned by the quarry owner is the closest structure.Additional <br /> seismographs and microphones will be placed in line with other nearby structures if deemed necessary. <br /> The levels desired for ground vibrations and air over pressure has been set below that of the <br /> State of Colorado requirements.The current regulations (7.C.R. 1101-9 Effective: March 10, 2015)states <br /> that the Maximum Allowable Particle Velocity Measured as Inches/second In Vertical,Transverse, or <br /> Longitudinal Directions shall not exceed 2 ips within 300 feet of the blast, and air over pressure at the <br /> nearest dwelling house, school, church, or otherwise occupied buildings shall not exceed 133 dB. <br /> The peak particle velocities will be measured in three mutually perpendicular directions from <br /> the blasting site. The maximum peak particle velocity to structures shall be the largest of any of the <br /> three measurements and will not exceed 1 inch per second (ips).The levels to structures for air over <br /> pressure will not exceed 130 decibels. Monitoring equipment will have a frequency range of 2 to 250 <br /> Hz. <br /> Guards are placed at all roadways that access the shot area and the guards have radio <br /> communication with the blaster. Currently the guard will be located at the entrance to the property <br /> which is the only road that accesses the mining area. If additional accesses are created, a guard will be <br /> placed at those locations. If the blast area is within 500 feet of Siloam Road, guards will be placed on <br /> the road outside the 500 ft radius and the road will be closed during the blast sequence. <br /> After the shot has been connected and readied for blasting, the blaster will contact each of the guards <br /> by radio and ensure that everything is safe for blasting. An air horn will be sounded 2 times at 2 minutes <br /> before the blast. <br /> The blaster will once again contact each of the guards to ensure that all is safe for blasting. An <br /> air horn will be sounded 3 times at 30 seconds from the blast. <br /> There will be a 10 second countdown given over the radio and then the blast will be done. <br /> After the blast, the blaster will physically go and check the blast area and ensure that there are <br /> no unfired explosives. He will then radio the guards and give them the all clear. One long air horn will be <br /> sounded. <br /> 5 <br />