2014-01-17_REPORT - M1980244 (3)

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Cripple Creek & Victor Gold Mining Company Phase 5 Slide Repair Final Report ameO Quality Assurance Monitoring &Test Results January 14, 2014 1.0 INTRODUCTION Cripple Creek & Victor Gold Mining Company (CC &V) operates the Cresson Project, located in Teller County, Colorado, near the city of Victor. The Cresson Project is a mining and ore processing and beneficiation facility that is composed of surface mines as well as a valley leach facility (VLF); an adsorption, desorption, and recovery (ADR) plant; and associated infrastructure, all of which were designed and constructed to meet or exceed the requirements established by CRS §34 -32 -101 et seq. and regulations promulgated there under by the Mined Land Reclamation Board (MLRB). The existing Cresson Project was constructed in phases from 1994 through 2011 (Phases 1 through 5). Phases 1 and 2 were permitted in 1994 and constructed during the 1994 through 1996 construction seasons. Phase 3 was permitted in 1999 and construction was initiated the same year, with completion in 2000. Phase 4 was permitted in 2000 and construction was completed in 2004. Phase 5 was permitted in 2008 and was completed in 2011. The work associated with the Cresson Project was performed under specific criteria established in Amendment Nos.8 and 9 of Permit No. M- 1980 -244 (Permit), as approved by the MLRB. This Report documents the Construction Quality Assurance (CQA) and Construction Quality Control (CQC) services provided by AMEC from September 2013 through November 2013 for the repair of the liner system at the area of an unexpected slide of Drain Cover Fill (DCF) material. The site location for the Phase 5 Liner Repair is presented on Figure 1. 1.1 Project Description The goal of the project was to repair damage to the primary geomembrane liner caused by a slide that caused damage to the Phase 5 geomembrane liner. A leak detection survey of the area was performed in April 2012 by Leak Location Services, Inc. to delineate the extent of the damaged area. Ames Construction, Inc. removed the existing DCF from the damaged liner and ECApplications, Inc. (ECA), the liner subcontractor to Ames, was responsible for removing the damaged liner and installing a new 80 -mil double -sided textured LLDPE geomembrane liner in the Phase 5 slide area, and inspecting the existing soil liner fill (SLF) for damage and make any necessary repairs. Ames then placed DCF over the newly installed liner while taking precautions to not cause any damage to the existing intact liner. AMEC was present to perform CQA monitoring and testing for SLF repair, the placement of the geomembrane, observation of the backfill at the anchor trench, placement of the DCF, and certification of the finished liner system. 1.2 Construction Quality Assurance /Construction Quality Control AMEC provided CQA and CQC monitoring and testing services, and prepared this report describing the monitoring and test results for the Phase 5 Slide Repair. As -built s:\projects \1568 cc &v -ph v slide repair cqa \11.0 certification report\cc &v roc report.docx