Laserfiche WebLink
Mr. Jack Henris <br />October 19 2016 <br />Page 7 <br />m:\min\tc1\_teller\m-1980-244 cc-v\am -11\m-80-244-am-11-2ndmaincomment2016-10-19r4combined.docx <br />42. Appendix 6, Paragraph 2.4, Stability Evaluation Results. The response is adequate. <br />43. Appendix 6, Figure 5, Section 3. Please explain why the east slope is steeper (2.5H:1V) <br />than during operations (2.9H:1V). The response is adequate. <br />44. Appendix 7, Table 2 – Runoff Coefficients. The response is adequate. <br />45. Appendix 7, PSSA Capacity and Pumping Rates. The response is adequate. <br />46. Appendix 7, PSSA Capacity and Pumping Rates. The response is adequate. <br />47. Appendix 7, Figures 4 and 5. The response is adequate. <br />48. Appendix 7, Figures 11, 12, 15, 16, 19, 20, 23, 24, and 27. The response is adequate. <br />49. Appendix 7, Table B.1. The response is adequate. <br />Volume IV – Appendices 9 through 14 <br />50. Appendix 9, Water Purchase Agreements. These agreements are signed by AngloGold <br />Ashanti (Colorado) Corp. The response is adequate. <br />51. Appendix 10, Chicago Tunnel Site (p. 5). “An existing 18-inch culvert beneath the Cripple <br />Creek access road / constructed riprap spillway. <br />a. Why not use a larger culvert. The response is adequate. <br />b. How is traffic to cross the riprap-lined spillway? The response is adequate. <br />52. Appendix 10, Chicago Tunnel Site (p. 6). Stormwater conveyances are required to pass the <br />peak flow resulting from the 100-year, 24-hour design storm. The response is adequate. <br />53. Appendix 10, Chicago Tunnel Site Detention Pond (p. 6). Please re-evaluate and re-design <br />as appropriate all AM-11 ponds and their spillways. The response is not adequate. The <br />SEDCAD model input (p. 7) in Attachment 13 indicates the sediment pond is empty at the <br />onset of the design storm. The Division’s engineer is all too familiar with the CC&V pond <br />design criteria as he designed several of them in the 1990’s. Regardless of the design <br />volume of the pond, the pond must be designed to pass the 100-year design flow assuming <br />the pond is full to the lowest, non-gated, gravity flow outlet structure, unless it can be <br />demonstrated the pond will be empty at the onset of the 100-year, 24-hour design storm. <br />Pursuant to Rule 7.3.1(3), please confirm the proposed 8-foot wide armored spillway at the <br />one-foot freeboard depth cut is designed to safely convey the full design peak flow to a point <br />past the toe of the embankment. <br />54. Appendix 10, Integration of Chicago Tunnel Site (p. 7). The last paragraph states “most of <br />the facilities have been constructed to meet those criteria”. The response is adequate. <br />55. Appendix 10, Figure 1 (p. 8). The response is adequate. <br />56. Appendix 10, Revised Globe Hill Mine Perimeter. Globe Hill Mine pit interception of <br />Poverty Gulch / “Bypass Pipeline”. CC&V’s commitment to evaluate alternative designs <br />for stormwater management in Poverty Gulch and submit a Technical Revision to propose <br />an alternative to the bypass pipeline is adequate.