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RULE 4 PERFORMANCE STANDARDS <br /> <br />Rule 4 Performance Standards 4-27 Revision Date: 4/9/25 <br /> Revision No.: MR-261 <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 /> <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 /> <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 /> <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 /> <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 /> <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 /> <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 /> <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