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RULE 2 PERMITS <br /> been made in the past seismographic records will not be used to demonstrate compliance with <br /> maximum peak particle velocities. Colowyo has chosen to continue the use of the-scaled-distance <br /> formula in Rule 4.08.4(10) (c) (i)to demonstrate compliance with ground vibration 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 /> MiniMate Series III , model DS-477 are maintained at the Durham Ranch and Wilson Creek <br /> resident area. Details regarding the monitor specifications are included in Exhibit 14. <br /> Airblast monitoring will be recorded on a seismograph report (See Figure 2.05-4) for review by <br /> in-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 /> Disposal of Excess Spoil <br /> Two additional pits have be developed within the permit boundary at Colowyo. One of the pits <br /> was developed in Sections 15 and 16, south of the existing operation and the other pit, defined as <br /> the West Pit, was developed in Section 4. <br /> The pit in Sections 15 and 16 (Section 16 Pit) was a single seam dragline operation. To develop <br /> the dragline operation, an initial cut must be opened near outcrop. A permanent excess spoil fill <br /> of approximately 2 million yd3 of excess spoil was constructed to accommodate the initial cuts. <br /> Please see Map 23 for historical mining areas of the Section 16 Pit. <br /> The West Pit was a multiple seam operation utilizing truck/shovel and dragline methods, similar <br /> to the East Pit operation. Approximately 45 million yd3 of box cut material was placed in an <br /> external fill (approximately 22 million yd3) north of the box cut excavation or as backfill <br /> (approximately 23 million yd3) in the initial pit area. Over 3 million yd3 was moved from the <br /> external fill and backfilled within the pit limits of the East and West Pits.Approximately 19 million <br /> yd3 of excess spoil will remain in place as a permanent excess spoil fill, consistent with applicable <br /> provisions of Rule 4.09(3). <br /> The West Pit Fill and Section 16 Fill are considered complete and have been mostly if not all Phase <br /> III released. No additional excess spoil exists for the West or Section 16 Pits. <br /> Detailed geotechnical investigations were completed for both the West Pit Fill and the Section 16 <br /> Fill by CTL/Thompson, Inc. Reports of the investigations are found in Exhibit 19. Construction <br /> plans for the fills, addressing the requirements of Rule 4.09, Disposal of Excess Spoil, can also be <br /> found in Exhibit 19. <br /> Rule 2 Permits 2.05-15 Revision Date: 12/20/19 <br /> Revision No.: TR-135 <br />