Laserfiche WebLink
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 <br />velocity will not exceed the criteria as prescribed by utilizing the equation found in Rule <br />4.08.4(10) (b) (i) when conducting blasting operations that could affect any dwelling, public <br />building, school, church, or commercial or institutional building. As shown in the Blasting <br />Analysis Map (Map 26) Colowyo has determined the maximum pounds of explosives per <br />8ms period of time for variable distance from any such structures. <br />The number of blast holes detonated per 8ms period will be calculated according to the <br />equation in Rule 4.08.4(10)(c)(i) in order to determine the maximum weight of explosive that <br />can be detonated within any eight ms period. <br />4.08.5 Records of Surface Blastine Activities <br />Colowyo will record all blasts including coal, overburden, and overburden pre-split blasts in <br />a format as shown in Section 2.05, Figure 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 <br />located along Moffat County Highway 13 at the Durham/Ott Ranch, Records of airblast <br />monitoring described on page 2.05-30 will contain the information required by Rule <br />4.08.5(17). This information will include either a recording of the calibration signal of the <br />monitoring instrument's gain setting at the time of each blast, or certifications of the <br />. 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 <br />number of blast holes per 8ms period of time such that the peak particle velocity limit of one <br />inch per 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 /> <br />4.08-6 Revision Date: 9/24/02 <br />Revision No.: RN-04 <br />