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• 5. Electric siren tone change and 2-way radio notification at thirty (30) seconds before blast. <br />6. All clear notification over 2-way radios and one (1) long siren signal of twenty (20) seconds duration <br />after area has been deemed safe for re-entry. <br />Any person within the blast area will be notified of the blast and removed from the area if their safety is in <br />danger. <br />The immediate blasting areas will be identified by 24" x 30" red and white signs stating "Danger Blasting <br />Areal - Keep Out - Authorized Entry Only." All points of public access to permit area will have a sign <br />stating "Warning Explosives in Use" (refer to Figure 3.1-2). <br />All entrances into the blasting area will be guarded from accidental entry. Communication will be main- <br />tained in the event that the blast must be delayed for any reason. All blasts will be designed to control <br />flyrock. The person in charge of the blasting activities will determine the safe distance from each blast <br />area and clear anyone out of the unsafe area to ensure personal safety. The person in charge of the <br />blasting operation will check the blast area after detonation and will give the "all clear" signal when it is <br />safe to enter the area. <br />When it is necessary to leave loaded holes overnight, all entrances into the pattern will be marked by a <br />series of cones and at least one sign will be placed to warn of loaded holes. <br />• Air blast will be controlled so as not to exceed applicable decibel limits at any inhabited dwelling, public <br />building, school, church, or community or institutional structure outside the proposed mine permit area as <br />outlined in Rule 4.08.4(6), unless a written waiver is obtained from the inhabitant. Trapper Mining Inc. <br />commits to monitoring each blast at the Trapper Mine for compliance with applicable airblast standards <br />until such time as a revision to the Trapper Mine permit may be submitted and approved that allows for a <br />different airblast monitoring frequency. When conducting airblast monitoring, Trapper will either utilize an <br />outside contractor or will monitor using in-house personnel. In either case the applicable requirements of <br />Rule 4.08.4(6) will be followed. Air blast monitoring will be accomplished using two Instantel Inc. <br />MinimateTm airblast monitoring units. One airblast monitoring unit will be located on the Stoddard Ranch, <br />approximately one mile north of the Trapper Mine permit boundary (N 415,020, E 1,434,550) and the other <br />at the north end of Trapper Mine property adjacent to the Stoddard Ranch (N 409,780, E 1,433,680). <br />These units may be moved to other locations, upon approval of the Division, as needed. The approved <br />Minimate units have a range of 88-178 dB; a resolution of 0.1 dB above 120 dB; trigger levels from 100- <br />178 dB in 1 dB steps; and an accuracy range of +/- 10% or +/- 1 dB, whichever is larger, between 4 and <br />125 Hz. The lower end flat frequency response is 2 Hz, while the upper end flat frequency response is 300 <br />Hz. <br />Blasting procedures in areas near petroleum or gas pipelines will be developed in cooperation with the <br />owners of such facilities. <br />• 3-31 <br />F _ ?0 4 !P