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amec <br />foster <br />wheeler <br />Technical Memorandum <br />To: Ron Roberts, CC&V Date: January 20, 2016 <br />Ron DiDonato, CC&V <br />From: Andrea Meduna, PE Amec Foster Project No.: 74201125N0 <br />Wheeler <br />Re: Solution Filling Curve for the Squaw Gulch Valley Leach Facility PSSA <br />1.0 Introduction <br />Amec Foster Wheeler Environment and Infrastructure, Inc. (Amec Foster Wheeler) has <br />prepared this technical memorandum for the Cripple Creek & Victor Gold Mining <br />Company (CC&V) in response to an error Amec Foster Wheeler identified while <br />performing an exercise at the request of CC&V Operations. <br />PROBLEM: The PSSA solution filling curve calculations in the design report Cripple <br />Creek & Victor Gold Mining Company Squaw Gulch Valley Leach Facility Design by <br />AMEC Earth & Environmental, Inc. (Design Report) dated September 11, 2011 were <br />calculated from the soil liner fill (SLF) elevations within the PSSA and not the top of the <br />low volume solution collection fill (LVSCF) which is also the elevation of the primary liner. <br />When the PSSA Record of Construction report was completed, the same elevations were <br />used as the design filling curve also providing inaccurate data. Essentially, the solution <br />storage volume between the primary and secondary geomembrane liners were included <br />and the elevations used were not correct. <br />CORRECTIVE ACTIONS: Provided with this memorandum is a revised filling curve <br />outlining the corrected solution volumes and elevations within the PSSA. This curve is <br />representative of as -built conditions and will demonstrate that the facility still can <br />successfully contain the design inflows and contingencies. <br />2.0 Current Conditions <br />As outlined on Drawing 7-9 of the Record of Construction drawings in Appendix A of the <br />Cripple Creek & Victor Gold Mining Company Squaw Gulch VLF Pregnant Solution <br />Storage Area Project Final Report Quality Assurance Monitoring & Testing Results dated <br />November 2014, by AMEC Environment & Infrastructure, Inc. report (PSSA ROC), the <br />elevations at the center of the PSSA High Volume Solution Collection riser plates ranges <br />Amec Foster Wheeler Environment & Infrastructure, Inc. <br />2000 S. Colorado Blvd., Suite 2-1000 <br />Denver, CO 80222 <br />Tel: +1 (303) 935-6505 <br />Fax: +1 (303) 935-6575 <br />amecfw.com <br />