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A resident or owner of a dwelling or structure that is located within one-half <br />mile of the location of the blast, as described in the annual blasting schedule, <br />shall be notified no less than 24 hours prior to any surface blasting or less <br />frequently as each resident occupant in such areas shall approve in writing to <br />the Division. <br />Colowyo will regulate access into the area possibly subject to flyrock from blasting to <br />protect the public and livestock. Fences are in place to keep livestock out of the mining <br />areas. The permit area will be identified by signs on the access road restricting entry to <br />authorized personnel. Signs will also be posted identifying the area as a blasting area <br />and describe the warning and all-clear signals. Immediate access to the area of <br />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 <br />does not exceed the values specified by the chart set forth in Rule 4.08.4(6). The <br />same design factors utilized to control the seismic effects of blasting (i.e.: the use of <br />numerous surface delays to "spread" the shots out over time, particularly near <br />residences) is also very effective in controlling airblast. Additionally, to keep airblast to <br />a minimum Colowyo also routinely 1) utilizes reduced weight (12 grain Zap) surface <br />primer cord, 2) uses proper stemming material, 3) uses a proper stemming height, 4) <br />avoids overdigging the front row of holes and 5) avoids overloading the front row of <br />holes. <br />Colowyo does perform event triggered monitoring. However, Colowyo will not commit <br />to daily monitoring due to unforeseen circumstances where the seismograph <br />monitoring unit may be getting repaired or calibrated. Colowyo employs an Instantel <br />Inc. Minimate Plus seismograph/microphone with a low frequency limit of 2 Hz which <br />corresponds to an airblast standard of 133 d6 (peak). Records of airblast monitoring <br />will contain the information required by Rule 4.08.5(17). This information will include <br />either a recording of the calibration signal of the monitoring instrument's gain setting at <br />the time of each blast, or certifications of the instrument's annual calibration. <br />4.08-5 <br />October 7, 2002 <br />RN-04 <br />CR 4.2.3.7.2 <br />