Laserfiche WebLink
regularly works within one-half mile from the blast area will be informed of the meaning of <br />the signals through appropriate instructions. Access to the immediate area of the blasting site <br />• will be cleared and controlled by qualified mine personnel prior to any blast. Colowyo also <br />maintains signs in accordance with 4.02.6. All areas subject to blasting are fenced for <br />livestock. <br />To protect the public, Colowyo will regulate access to any area possibly subject to flyrock <br />from blasting within the permit area. The mine area will be identified by signs on all access <br />roads restricting entry to unauthorized personnel. Signs identifying the area as a blasting area <br />will describe the warning and all-clear signals. Four series of three short sirens and four <br />series of three long sirens will be sounded before the blast. After checking the blast, the <br />Blasting Foreman will report all clear to the barricade crews. <br />Colowyo will use the explosive equation of 4.08.4 (10)(c)(i) to limit the pounds of explosive <br />per 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 <br />are set forth in Exhibit 14 -Seismographic Measurements. Although seismographic measure- <br />ments have been made in the past seismographic records will not be used to demonstrate <br />compliance with maximum peak particle velocities. Colowyo has chosen to continue the use <br />of the -scaled-distance formula in Rule 4.08.4(10) (c) (i) to demonstrate compliance with <br />ground vibration requirements. <br />Colowyo will conduct airblast monitoring to ensure compliance with airblast standards. All <br />blast events will be monitored for airblast. On these reports Colowyo will record the name <br />of the company doing the monitoring, the person taking the periodic airblast reading, the <br />name of the person analyzing periodic airblast records, and the distance of the instrument <br />from the blast. Airblast monitoring will be taken from the closest dwelling to the blast area. <br />An Instantel Inc. Blastmate Series II .model DS-477 are maintained at the Durham Ranch <br />and Wilson Creek resident area. Details regarding the monitor specifications are included in <br />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 />'• <br />2.05-30 Revision Date: I/2/04 <br />Revision No.: MR-61 <br />