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Maintenance practices will include quarterly inspections by a Registered Professional Engineer <br />or his qualified designate, certification on completion of each phase (new fill bench) of <br />construction, clean-out and repair of drainage structures, and additional periodic inspections for <br />any evidence of instability or excessive erosion. Quarterly inspection reports will note pile <br />conditions, quantity and location of any refuse placed in or removed from the pile, any <br />maintenance or repair activities completed, and the status of any final grading and reclamation <br />activities. Any potentially hazardous conditions identified as a result of the inspections will be <br />promptly reported to the CDMG, and emergency mitigation measures implemented as soon as <br />reasonably feasible. <br />Conclusion <br />The proposed refuse pile meets the geotechnical requirements of CDMG. The slope stability <br />evaluation results indicate that the new proposed refuse pile can be safely constructed to meet <br />CDMG requirements assuming 2 horizontal to 1 vertical slopes with a 10 foot wide bench placed <br />every 50 feet in elevation. The capacity of the proposed refuse pile is 382,000 cubic yazds. <br />Minor modifications to the refuse pile profile for purposes of routing runoff away from outslopes <br />(such as sloping the head of the fill up to 3% and grading the terrace benches 3-5% into the fill) <br />would not significantly affect the geotechnical analysis, provided the drainage is .constructed <br />such that erosion and infiltration aze minimized as proposed in Exhibit 2.05-E4, Mine <br />Development Rock/Coal Refuse Facility Design, prepared by Montgomery Watson Harza.. <br />If you have any questions, please do not hesitate to contact Willy Accame at (303) 850-9200. <br />• Sincerely yours, <br />Manley Tom, P.E. <br />Technical Manager <br />G 'lle o M. Accame <br />Vi e P sident <br />Enclosures <br />• <br />5 <br /> <br />