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RULE 4 PERFORMANCE STANDARDS <br />Ranch residents were also presented with a copy of the report. On May 20, 1997 an additional copy of <br />the report was presented to the Durhams and also a copy forwarded to the Division. A copy of the May <br />20, 1997 letter can be found in Exhibit 14 - Seismograph Measurements. <br />4.08.3 Public Notice of Blasting Schedule <br />The blasting program at the Colowyo operation will involve the detonation of more than five pounds of <br />explosives or blasting agent in all blasts. Colowyo will annually publish a blasting schedule in the local <br />Craig newspaper. A typical blasting schedule published in the local newspaper is set forth in Section <br />2.05, Figure 2.05-1, Publication of Blasting Schedule. <br />Copies of the blasting schedule will be republished and redistributed every 12 months by mail to local <br />governments and public utilities and by mail or delivered to each residence within one-half mile of the <br />blasting site described in the schedule. <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. Colowyd 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 />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 area will <br />be identified by signs on the access road restricting entry to authorized personnel. Signs will also be <br />posted identifying the area as a blasting area and describe the warning and all-clear signals. Immediate <br />access to the area of blasting will be cleared and controlled by qualified mine personnel prior to any <br />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 uses various other methods to ensure airblasts are kept in compliance. <br />Colowyo will not conduct blasting within 1000 feet of any building used <br />4.08.4 Surface Blasting Requirements <br />Colowyo will conduct all blasting operations during daylight hours between sunrise and sunset as set <br />forth in the blasting schedule in Section 4.08.3. <br />Warnings and notices of unscheduled blasting between sunset and sunrise that cannot be delayed until the <br />next day due to unavoidable hazardous conditions will be provided in accordance with the requirements <br />Rule 4 Performance Standards 4.08-2 Revision Date: 6/23/08 <br />Revision No.: MR-91