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extensive that they require specific stability analysis to determine <br />their stability. <br />In order to satisfy the requirements of the regulations, and in response <br />to earlier Division adequacy comments, the applicant specifically <br />discussed and analyzed the stability of the following proposed road and <br />conveyor cuts: <br />Operational <br />Surface facility Survey Station Cut Height Safety factor <br />Road from central Sta. 28+50' 65 ft 1.69 <br />processing to refuse to 31+70' <br />disposal area <br />" Sta. 40+40' 60 ft T.72 <br /> to 45+50' <br />" Sta. 45+50' 45 ft 1.61 <br /> to 48+40' <br />McClave Canyon Road Sta. 20+50' 80 ft 1.67 <br /> to 23+25' <br />Conveyor Alignment Sta. 40+90' 90 ft 1.79 <br /> to 51+25' <br />" Sta. 53+25' 50 ft Greater <br />to 55+25' than the <br />above, by <br />analogy <br />~~The applicant has committed to backfilling each of the roadway and <br />'conveyor cuts to the approximate original contour. <br />Road Drainage Control <br />Road drainage ditches are designed to convey surface runoff resulting <br />from the 10-year, 24-hour storm event. All culverts conducting drainage <br />beneath road surfaces will safely pass 10-year, 24 hour peak flows and <br />will be appropriately installed. In some cases, discharges from the <br />culverts may be at velocities which are erosive. Care must be taken at <br />all culvert discharge points to dissipate energy due to these high <br />velocity discharges. Salt Creek Mining Company has installed protective <br />devices at culvert discharge points at existing operations which <br />demonstrate little or no erosion. If the applicant continues to use <br />these measures during the proposed operation, there should be little <br />problem with erosion at discharge points. <br />The proposed road culvert installation scheme does not conform with <br />performance standards of Rule 4.03.1(4)(e)(vi)(A) regarding culvert <br />spacing. Adherence to these spacing requirements ensures that drainage <br />systems will not be breached and excessive erosion will not result. <br />Alternative specifications are allowed under the provisions of <br />4.03.1(4)(e)(vi) if the applicant can demonstrate that such <br />specifications will not result in an increase in erosion. In this <br />particular case, the Division would recommend the installation of <br />_ig_ <br />