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\' ~y <br />regularly works within one-half mile from the blast area will be informed of the meaning of the <br />signals through appropriate instructions. Access to the immediate area of the blasting site will be <br />cleared and controlled by qualified mine personnel prior to any blast. Colowyo also maintains <br />signs in accordance with 4.02.6. All areas subject to blasting are fenced for livestock. <br />To protect the public, Colowyo will regulate access to any area possibly subject to flyrock from <br />blasting within the permit area. The mine area will be identified by signs on all access roads <br />restricting entry to unauthorized personnel. Signs identifying the area as a blasting area will <br />describe the warning and all-clear signals. Four series of three short sirens and four series of three <br />long sirens will be sounded before the blast. After checking the blast, the Blasting Foreman will <br />report all clear to the barricade crews. <br />Colowyo will use the explosive equation of 4.08.4 (l0)(c)(i) to limit the pounds of explosive per <br />8ms period, similar to that shown on the Blasting Analysis Map (Map 26). Some previous <br />seismographic measurements were made during blasting operations at Colowyo; the results are <br />set forth in Exhibit 14 -Seismographic Measurements. Although seismographic measurements <br />have been made in the past seismographic records will not be used to demonstrate compliance <br />with maximum peak particle velocities. Colowyo has chosen to continue the use of the -scaled- <br />distance formula in Rule 4.08.4(10) (c) (i) to demonstrate compliance with ground vibration <br />requirements. <br />Colowyo will conduct airblast monitoring to ensure compliance with airblast standards. All blast <br />events will be monitored for airblast. On these reports Colowyo will record the name of the <br />company doing the monitoring, the person taking the periodic airblast reading, the name of the <br />person analyzing periodic airblast records, and the distance of the instrument from the blast. <br />Airblast monitoring will be taken from the closest dwelling to the blast area. An Instantel Inc. <br />Blastmate Series II ,model DS-477 are maintained at the Durham Ranch and Wilson Creek <br />resident area. Details regarding the monitor specifications aze included in Exhibit 14. <br />Airblast monitoring will be recorded on a seismograph report (See Figure 4) for review by in- <br />house personnel, agency representatives, and requesting publics. The airblast data is recorded <br />under the "PSPL" (Peak Sound Pressure Levels) in decibels (dB <br />Additional information concerning the use of explosives is found in Section 4.08 <br />Revision Date: 1/2/04 <br />Revision No.: MR-61 <br />2.05-30 <br />