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regularly works within one-half mile from the blast area will be informed of the meaning of the signals through appropriate instructions. Access to the immediate area of the blasting site will be cleared and controlled by qualified mine personnel prior to any blast. Colowyo also maintains signs in accordance with 4.02.6. All areas subject to blasting are fenced for livestock. To protect the public, Colowyo will regulate access to any area possibly subject to flyrock from blasting within the permit area. The mine area will be identified by signs on all access roads restricting entry to unauthorized personnel. Signs identifying the area as a blasting area will describe the warning and all-clear signals. Four series of three short sirens and four series of three long sirens will be sounded before the blast. After checking the blast, the Blasting Foreman will report all clear to the barricade crews. Colowyo will use the explosive equation of 4.08.4 (10)(c)(i) to limit the pounds of explosive per Bms period, similar to that shown on the Blasting Analysis Map (Map 26). Some previous seismographic measurements were made during blasting operations at Colowyo; the results are set forth in Exhibit 14 - Seismographic Measurements. Although seismographic measure- ments have been made in the past seismographic records will not be used to demonstrate compliance with maximum peak particle velocities. Colowyo has chosen to continue the use of the scaled-distance formula in Rule 4.08.4(10)(c)(i) to demonstrate compliance with ground vibration requirements. • Colowyo will periodically conduct airblast monitoring to ensure compliance with airblast standards. An Instantel Inc. Blastmate Series II model DS-477 has been installed at the Durham ranch. Details regarding the monitor specifications are included in Exhibit 14. Additional information concerning the use of explosives is found in Section 4.08. 2.05-30 Revisbn Submiilled i 4 /u+ 4 Y r~,,ion No. t R - y ~I