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State Reg. <br />• 2.05.3(6) <br />(a) <br />• <br />• <br />BLASTING PLAN <br />Peabody Coal Company will drill and blast overburden parting <br />and coal materials in the proposed permit area at the Seneca II <br />~4ine site. The overburden above the Wadge and Lennox coal <br />seams will be drilled with a rotary air drill. The finished <br />holes will measure approximately 9 inches in diameter. The <br />overburden above the Wolf Creek coal seam will also be drilled <br />by a rotary air drill. The finished holes will measure <br />approximately 10-5/8 inches in diameter. Pattern size will <br />vary depending upon overburden depth and may range from 18' x <br />28' to 25' x 30'. <br />After the holes are drilled they are loaded with either an <br />ammonium-nitrate fuel-oil mixture (ANFO) or a water gel <br />(slurry) depending on the moisture in the drilled hole. The <br />loading rate is approximately 10 lbs./foot of drill hole depth. <br />Cast primers and detonation cord are placed down the hole <br />during the loading of the ANFO or water gel to insure proper <br />blast hole detonation. <br />After the holes are loaded and a decision is made to prepare <br />the holes for firing, milli-second (M-S) delay connectors will <br />be inserted into the circuit to insure proper fragmentation, <br />and minimize vibration, air blast, dust generation and flyrock. <br />Once the (M-S) delay connectors are inserted into the circuit, <br />the shot is now ready to be detonated. <br />The maximum weight of the explosive to be detonated per blast <br />will not exceed the allowable weight specified by the formula <br />W = (D/60)z where W = the maximum weight of explosives in <br />pounds that can be detonated in any 8 milli-second period, and <br />D = the distance in feet from the blast site to the nearest <br />dwelling, school, church, or institutional building. <br />12-39 Revised 8/27/86 <br />