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RULE 4 PERFORMANCE STANDARDS <br /> day, when the blast was actually conducted, the warning notices given, and a copy of the blast <br /> report will be filed- by Colowyo with the Division, but not later than three days after the night <br /> blasting. <br /> Colowyo will conduct blasting at times announced in the blasting schedule except in those <br /> unavoidable hazardous situations, previously approved by the Division in this application. <br /> Unavoidable hazardous situations can exist if safety requires: <br /> 1. Destruction of damaged or deteriorating explosives or detonators; or <br /> 2. Disposal of misfires and/or undetonated explosives; or <br /> 3. Firing of charged holes as soon as practicable after cessation where electricity or <br /> stray current conditions where electric detonators are used; or <br /> 4. Firing of charged holes when weather conditions indicate the existence of a safety <br /> hazard is eminent <br /> Colowyo gives warning and all-clear signals of different characters that are audible- within a <br /> range of one-half mile of the blast. Individuals within the permit area and individuals who reside <br /> or work within one-half mile of the mining area will be notified of the meaning of the signals <br /> through appropriate written instructions. Colowyo will periodically inform such individuals of <br /> the proposed blasting schedule and inform them of the meaning of the signals. Colowyo will <br /> also maintain signs in accordance with Section 4.02. <br /> A resident or owner of a dwelling or structure that is located within one-half mile of the location <br /> of the blast, as described in the annual blasting schedule, shall be notified no less than 24 hours <br /> prior to any surface blasting or less frequently as each resident occupant in such areas shall approve <br /> in writing to the Division. <br /> Colowyo will regulate access into the area possibly subject to flyrock from blasting to protect the <br /> public and livestock. Fences are in place to keep livestock out of the mining areas. The permit <br /> area will be identified by signs on the access road restricting entry to authorized personnel. Signs <br /> will also be posted identifying the area as a blasting area and describe the warning and all-clear <br /> signals. Immediate access to the area of blasting will be cleared and controlled by qualified mine <br /> personnel prior to any blast. <br /> Colowyo will control air blast from its blasting operations within the permit area so it does not <br /> exceed the values specified by the chart set forth in Rule 4.08.4(6). The same design factors <br /> utilized to control the seismic effects of blasting (i.e.: the use of numerous surface delays to <br /> "spread"the shots out over time,particularly near residences)is also very effective in controlling <br /> airblast. Additionally, to keep airblast to a minimum Colowyo also routinely 1) utilizes reduced <br /> weight (12 grain Zap) surface primer cord, 2) uses proper stemming material, 3) uses a proper <br /> stemming weight, 4) avoids overdigging the front row of holes and 5) avoids overloading the <br /> front row of holes. <br /> Colowyo does perform event triggered monitoring. However, Colowyo will not commit to daily <br /> monitoring due to unforeseen circumstances where the seismograph monitoring unit may be <br /> getting repaired or calibrated. Colowyo employs an Instantel Inc. Minimate Plus <br /> Rule 4 Performance Standards 4-27 Revision Date: 12/20/19 <br /> Revision No.: TR-135 <br />