2013-01-04_REVISION - M1977193 - Laserfiche WebLink

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Rule 6.5 Geotechnical Stability Exhibit (any required sections) (1) On a site - specific basis, Applicant shall be required to provide a geotechnical evaluation of all geologic hazards that have the potential to affect any proposed impoundment, slope, embankment, highwall, or waste pile within the affected area. The Applicant may also be required to provide a geotechnical evaluation of all geologic hazards, within or in the vicinity of the affected lands that may be de- stabilized or exacerbated by mining or reclamation activities. ALL FINAL HIGHW ALL CONFIGURATION PLANS HAVE BEEN DESIGNED IN ACCORDANCE WITH SITE SPECIFIC ROCK STABILITY CHARACTERISTICS AS PORTRAYED BY EXISTING MINJNG FACES, CURRENT MINING PRACTICES AND EXPERIENCE. THE FINAL HIGHWALL CONFIGURATION PLAN HAS BEEN REVIEWED BY A PROFESSIONAL GEOLOGIST AND FOUND TO BE COMPATIBLE AND APPROPRIATE FOR THE ROCK CONDITIONS FOUND AT THIS LOCATION. (2) On a site - specific basis, Applicant shall be required to provide engineering stability analyses for proposed final reclaimed slopes, highwalls, waste piles and embankments. Applicant may also be required to provide engineering stability analyses for certain slopes configuration as they will occur during operations, including, but not limited to embankments. Information for slope stability analyses may include, but would not be limited to, slope angles and configurations, compaction and density, physical characteristics of earthen materials, pore pressure information, slope height, post - placement use of site, and information on structures or facilities that could be adversely affected by slope failure. THE DESIGN AND CONSTRUCTION OF ALL SEDIMENT PONDS, WATER CONTAINMENT STRUCTURES, BERMS, DITCHES, INLETS, AND SPILLWAYS HA VB BEEN REVIEWED AND APPROVED BY A LICENSED PROFESSIONAL ENGINEER. AT THE COMPLETION OF CONSTRUCTION, ALL STRUCTURES WILL BE INSPECTED AND CERTIFIED OPERATIONAL BY AN ENGINEER LICENSED IN THE STATE OF COLORADO. (3) Where there is the potential for off -site impacts due to failure of any geologic structure or constructed earthen facility, which may be caused by mining or reclamation activities, the Applicant shall demonstrate through appropriate geotechnical and stability analyses that off -site areas will be protected with appropriate factors of safety incorporated into the analysis. The minimum acceptable safety factors will be subject to approval by the Office, on a case -by -case basis, depending upon the degree of certainty of soil or rock strength determinations utilized in the stability analysis, depending upon the consequences associated with a potential failure, and depending upon the potential for seismic activity at each site. THE DESIGN OF THE STORMWATERMANAGEMENTPLAN IS SUCH THAT SEDIMENT PONDS ARE LOCATED IN A REDUNDANT AND CHAIN-LIKE ARRANGEMENT AND LOCATION SO AS TO MINIMIZE OFF- Sl'1'E IMP ACTS TO PROPERTY IN THE EVENT OF A FAILURE OF ANY STRUCTURE WITHIN THE STORMWA I'ER MANAGEMENT SCENARIO. THE MINE OPERATOR HAS PROPOSED THIS PT .AN AS THE BEST MANAGEMENT PRACTICE AVAILABLE TO ADDRESS CONTROL OF OFF-SUE IMPACTS DUE TO STORM RELATED EVENTS. (4) At sites where blasting is part of the proposed mining or reclamation plan, the Applicant shall demonstrate through appropriate blasting, vibration, geotechnical, and structural engineering analyses, that off-site areas will not be adversely affected by blasting.