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amec?% <br />April 9 2009 <br />Mr. Ron Roberts <br />CC&V Projects <br />Cripple Creek & Victor Gold Mining Co. <br />P.O. Box 191 <br />Victor, CO 80860 <br />Re: Response to RFI #090601-A-CCV-R0015 <br />Dear Ron: <br />AMEC Earth and Environmental (AMEC) has prepared this response to the Request for Information (RFI) <br />No. 090601-A-CCV-R0015 submitted by Ames Construction on 8 April, 2009. The subject RFI requests a <br />change in the Phase 5 Valley Leach Facility (VLF) specifications on the Plasticity Index (PI) of aggregate <br />materials. The change is requested to better match the characteristics of the borrow source. <br />AMEC has reviewed the material specifications for the Phase 5 VLF, and agrees that the PI can be <br />modified for some of the aggregate materials. The following summarizes the acceptable changes to the <br />PI specifications: <br />Fine Shaft Backfill (FSB): <br />o Original PI specification: 5 maximum <br />o Revised PI specification: 15 maximum <br />Pipe Bedding <br />o Original PI specification: 5 maximum <br />o Revised PI specification: 15 maximum <br />Granular Filter <br />o Original PI specification: 5 maximum <br />o Revised PI specification: 15 maximum <br />It is AMEC's opinion that these changes to the PI specifications will not have any significant affect on the <br />performance of these materials in the Phase 5 VLF design. If you have any questions or comments, <br />please contact me at (303) 433-0262. <br />Sincerely, <br />AMEC Earth & Environmental, Inc. <br />John F. Lupo, Ph.D., P.E. <br />Principal Engineer <br />JFL:jfI <br />AMEC Earth & Environmental, Inc. <br />304 Inverness Way South, Suite 490 <br />Englewood, Colorado 80112 <br />Tel: (303) 433-0262 <br />Fax: (303) 433-0362 www.amec.com <br />SAPROJECTS\1125E CCV cqa\e - correspondence\rfi 090601-a ccv-r0015 specifications letter.doc