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<br />DATE: April 12, 2000 <br />TO: Berhan Keffelew <br />FROM: Jim Pendleton <br />• ~I I I II I I~ I II ~~II ~I~ <br />sss <br />RE: CC&VG CRESSON PROJECT - Geotechnical Adequacy Review - <br />March, 2000 - Amendment No. B Application - Volume IV, <br />Appendix 6, "Overburden Storage Areas Stability and <br />Hydrology Evaluation..." <br />(Permit No: M-80-244) <br />Disclaimer <br />As usual, my opinions will be limited to the geotechnical elements <br />and within-fill ground water table assumptions contained within <br />Appendix 6. I assume that other Division specialists will review, <br />and render opinions regarding, the surface hydrologic elements of the <br />proposed plan for the overburden storage areas. <br />Introduction <br />This appendix contains stability and hydrology evaluations and <br />reports for both the Squaw Gulch Overburden Storage Area (SGOSA) and <br />the Arequa Gulch Overburden Storage Area (AGOSA) The evaluation and <br />report was prepared for Cripple Creek and Victor Gold (CC&VG) by <br />Golder Associates, Inc. (GAI). <br />During the prolonged review and approval of previous Amendment No. 6 <br />(1996) and Amendment No. 7 (1998/9), the Division forwarded detailed <br />review comments to CC&VG. These comments covered a broad selection of <br />geotechnical and hydrologic topics related to the SGOSA and AGOSA; <br />including but not limited to, slope stability evaluation (static & <br />pseudo-static), seismic evaluation & stability evaluation <br />implications, geotechnical structure and slope design, surface <br />hydrology evaluation, surface hydrology facility design, ground water <br />hydrology evaluation and design application, construction phasing, <br />surety calculation, and standard specification development. <br />