Laserfiche WebLink
HOLE DIAMETER=3/:' <br /> PATTERN=8X8 OR 7X7 OR TIGHTER(Depending on depths—shallower depths would require a tighter <br /> pattern) <br /> PRIMERS=200 GRAM AND 350 GRAM CAST BOOSTER <br /> INITIATION=NON ELECTRIC SHOCK TUBE <br /> BULK EXPLOSIVE USED=ANFO OR TITAN EMULSION AT 1.05 g1cc FINAL DENSITY(WHEN THE <br /> EXPLOSIVES ARE LOADED INTO THE HOLE, THE BLASTER WILL MONITOR THE RISE OF THE EXPLOSIVE <br /> COLUMN WITH A TAPE MEASURE AND STOP THE LOADING WHEN THE DESIRED STEMMING HEIGHT IS <br /> REACHED. THIS IS DONE ON EVERY HOLE LOADED.) <br /> TIMING=17MS to 25MS FROM HOLE TO HOLE AND 42MS TO 84MS FROM ROW TO ROW <br /> STEMMING=CRUSHED STONE FROM 4 FT TO 8 FT. <br /> The pattern is laid out on the ground by the blaster and the holes are drilled to the depth as <br /> determined by the thickness of the rock structure.The holes are protected with a hole plug so that no <br /> loss to the depth occurs until the day of blasting. <br /> Once the pattern is drilled, the blast is scheduled. <br /> DAY OF BLASTING PROCEDURE IN REGARDS TO NOTIFICATION, SEISMIGRAPH PLACEMENT <br /> AND SHOT GUARDING <br /> 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 /> A seismograph will be placed at the property line between the blast and the home that is owned <br /> by the quarry owner. Other seismographs will be placed at nearby residence if deemed necessary. <br /> The levels desired for ground vibrations and air over pressure has been set well below that of <br /> the State of Colorado requirements.The levels to non owned structures will not exceed 1 inch per <br /> second (ips) and the air over pressure will not exceed 131 decibels. <br /> Guards are placed at all roadways that access the shot area and the guards have radio <br /> communication with the blaster. After the shot has been connected and readied for blasting, the blaster <br /> will contact each of the guards by radio and ensure that everything is safe for blasting.An air horn will <br /> be sounded 2 times at 2 minutes 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 />