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ame <br />May 17, 2010 <br />Mr. Timm Comer <br />Manager, Environmental Resources <br />Cripple Creek & Victor Gold Mining Co. <br />P.O. Box 191 <br />100 North Third Street <br />Victor, CO 80860 <br />Re: TR 59 Drawings <br />Dear Timm: <br />Enclosed, please find eight (8) wet stamped drawings to be included in the Technical Revision (TR) 59 <br />submittal. The wet stamp drawings are for the Phase 4 B/C Triangle Project and the LOB Pad. The Phase <br />4 B/C Triangle Project drawing shows the limits and liner details for the area to be lined. The LOB Pad <br />drawing shows the extent of the proposed lined area within the existing LOB area. <br />Note that the liner to be used for the LOB Pad is an 80 mil Linear Low Density Polyethylene (LLDPE) <br />combined with a bentonite backing (GSE Gundseal or equivalent). The liner is to be installed on <br />compacted fill per the grades shown on the drawing. For surface preparation: <br />"CONTRACTOR shall roll the surface of the Fill with a smooth drum roller to remove ridges and surface <br />irregularities greater than 0.5 inches in height. CERTIFYING ENGINEER shall determine if surface <br />preparation is sufficient to place geomembrane. On areas with slopes steeper than 3H:1 V, <br />CONTRACTOR shall adopt methods as necessary to obtain the same final surface preparations that <br />would be obtained by the passage of a smooth-drum roller on flat or level ground. Pushing of compaction <br />equipment by tracked equipment shall not be performed. Wheel ruts on the surface of the Fill from <br />grading equipment shall be repaired by CONTRACTOR prior to placement of the geomembrane by rolling <br />the surface as approved by CQA Monitor' <br />The geomembrane liner shall be installed and welded in compliance with Specification 2776, as <br />presented in Amendment No. 9. <br />If you have any questions or comments, please contact me at (303) 433-0262. <br />Sincerely, <br />AMEC Earth & Environmental, Inc. <br />n F. Lupo, Ph.D., P.E. <br />Principal Engineer <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 <br />www.amec.com <br />e / <br />i ? •e ?? ?? o ?3 <br />si??'S??eJg? ?+` <br />tli 11 <br />S1PROJECTS\1125E CCV CQA\e - correspondence\tr 59 letter.doc