Laserfiche WebLink
RULE 4 PERFORMANCE STANDARDS <br /> seismograph/microphone with a low frequency limit of 2 Hz which corresponds to an airblast <br /> standard of 133 dB (peak). Records of airblast monitoring will contain the information required <br /> by Rule 4.08.5(17). This information will include either a recording of the calibration signal of <br /> the monitoring instrument's gain setting at the time of each blast, or certifications of the <br /> instrument's annual calibration. <br /> Colowyo will conduct blasting to prevent injury to persons and damage to public or private <br /> property outside the permit area. Colowyo will insure that the maximum peak particle velocity will <br /> not exceed the criteria as prescribed by utilizing the equation found in Rule 4.08.4(10)(b)(i)when <br /> conducting blasting operations that could affect any dwelling, public building, school, church, or <br /> commercial or institutional building.As shown in the Blasting Analysis Map (Map 26A)Colowyo <br /> has determined the maximum pounds of explosives per 8ms period of time for variable distance <br /> from any such structures. <br /> The number of blast holes detonated per 8ms period will be calculated according to the equation <br /> in Rule 4.08.4(10)(c)(i) in order to determine the maximum weight of explosive that can be <br /> detonated within any eight ms period. <br /> 4.08.5 Records of Surface Blasting Activities <br /> Colowyo will record all blasts including coal, overburden, and overburden pre-split blasts in a <br /> format as shown in Section 2.05, Figure 2.05-2, Blasting Report, which conforms to the <br /> requirements of 4.08.5. Conducting blasting operations in accordance with the equation in <br /> 4.08.4(10)(c)(i) deems peak particle velocities from blasting to be within the regulatory limits <br /> described in 4.08.4(10). Periodic airblast monitoring occurs at Colowyo. The monitor is located <br /> along Moffat County Highway 13 at the Durham/Ott Ranch. Records of airblast monitoring <br /> described on page 2.05-30 will contain the information required by Rule 4.08.5(17). This <br /> information will include either a recording of the calibration signal of the monitoring instrument's <br /> gain setting at the time of each blast, or certifications of the instrument's annual calibration. <br /> 4.08.6 Seismographic Measurements <br /> Colowyo will use the explosives equation found in Subsection 4.08.4(10)(b)(i)to limit the number <br /> of blast holes per 8ms period of time such that the peak particle velocity limit of one inch per <br /> second will not be exceeded. <br /> On June 19 and 20, 1979 initial seismic monitoring of shots at the Colowyo operation was <br /> conducted. The results of this seismographic work are set forth in Exhibit 14, Seismographic <br /> Measurements. <br /> 4.09 DISPOSAL OF EXCESS SPOIL AND UNDERGROUND DEVELOPMENT FILL <br /> WASTE <br /> To develop the West Pit and Section 16 Pit, it was necessary to construct two excess spoil fills <br /> from material in the initial cuts. The designs detail for these fills is presented in Exhibit 19 — <br /> Geotechnical Investigations, West Pit Fill and Section 16 Fill. <br /> Rule 4 Performance Standards 4-28 Revision Date: 12/20/19 <br /> Revision No.: TR-135 <br />