Laserfiche WebLink
RULE 4 PERFORMANCE STANDARDS <br />of this Section.- oral notices will be provided to residents or owners of dwellings within one-half mile of <br />the blasting site within 24 hours prior to any blasting which might be conducted between sunset and <br />sunrise. A complete written report of the blasting at night describing in detail reasons for delay in <br />blasting, including- why the blast could not be held over for the next day, when the blast was actually <br />conducted, the warning notices given, and a copy of the blast report will be filed- by Colowyo with the <br />Division, but not later than three days after the night blasting. <br />Colowyo will conduct blasting at times announced in the blasting schedule except in those unavoidable <br />hazardous situations, previously approved by the Division in this application. Unavoidable hazardous <br />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 stray <br />current conditions where electric detonators are used; or <br />4. Firing of charged holes when weather conditions indicate the existence of a safety hazard <br />is eminent <br />Colowyo gives warning and all-clear signals of different characters that are audible- within a range of <br />one-half mile of the blast. Individuals within the permit area and individuals who reside or work within <br />one-half mile of the mining area will be notified of the meaning of the signals through appropriate <br />written instructions. Colowyo will periodically inform such individuals of the proposed blasting <br />schedule and inform them of the meaning of the signals. Colowyo will also maintain signs in <br />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 of the <br />blast, as described in the annual blasting schedule, shall be notified no less than 24 hours prior to any <br />surface blasting or less frequently as each resident occupant in such areas shall approve in writing to the <br />Division. <br />Colowyo will regulate access into the area possibly subject to flyrock from blasting to protect the public <br />and livestock. Fences are in place to keep livestock out of the mining areas. The permit area will be <br />identified by signs on the access road restricting entry to authorized personnel. Signs will also be posted <br />identifying the area as a blasting area and describe the warning and all-clear signals. Immediate access to <br />the area of blasting will be cleared and controlled by qualified mine personnel prior to any blast. <br />Colowyo will control air blast from its blasting operations within the permit area so it does not exceed <br />the values specified by the chart set forth in Rule 4.08.4(6). The same design factors utilized to control <br />the seismic effects of blasting (i.e.: the use of numerous surface delays to "spread" the shots out over <br />time, particularly near residences) is also very effective in controlling airblast. Additionally, to keep <br />airblast to a minimum Colowyo also routinely 1) utilizes reduced weight (12 grain Zap) surface primer <br />cord, 2) uses proper stemming material, 3) uses a proper stemming weight, 4) avoids overdigging the <br />front row of holes and 5) avoids overloading the 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 getting <br />repaired or calibrated. Colowyo employs an Instantel Inc. Minimate Plus seismograph/microphone <br />with a low frequency limit of 2 Hz which corresponds to an airblast standard of 133 dB (peak). <br />Records of airblast monitoring will contain the information required by Rule 4.08.5(17). This <br />information will include either a recording of the calibration signal of the monitoring instrument's gain <br />setting at the time of each blast, or certifications of the instrument's annual calibration. <br />Rule 4 Performance Standards 4.08-3 Revision Date: 6/23/08 <br />Revision No.: MR-91