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Cripple Creek & Victor Gold Mining Company Laboratory Liner Extension 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 I through 5). Phases I and II were permitted in 1994 and constructed during the 1994 through 1996 construction seasons. Phase III was permitted in 1999 and construction was initiated the same year, with completion in 2000. Phase IV was permitted in 2000 and construction completed in 2004. Phase 5 was permitted in 2008 and completed in 2011. The work associated with the Cresson Project was performed under specific criteria established in Amendment Nos. 8, 9, and 10 of Permit Number M- 1980 -244, as approved by the MLRB. This Report documents the Construction Quality Assurance (CQA) and Construction Quality Control (CQC) services provided by AMEC Environment and Infrastructure (AMEC) from January 22, 2013 through January 24, 2013 for the extension of the liner system at the laboratory. The general site location for the Laboratory Liner Extension is presented on Figure 1. 1.1 Project Description The Laboratory Liner Extension project began with small scale site grading and preparation of the subgrade. Upon acceptance of the subgrade; a geosynthetic clay liner (GCL) was placed over the subgrade. To complete the composite liner system, a layer of 80 -mil single -sided texture LLPDE was placed and overlaid with a layer of 12 oz. /yd2 non -woven geotextile. After the composite geosynthetic liner system was in place, a 6- inch - reinforced concrete slab was placed over the liner system. The liner was secured to the concrete using batten strips where concrete was already in place. Where the new slab was located, the liner was extrusion welded to an embedded HDPE "T -lock" manufactured by Agru America. 1.2 Project Coordination AMEC CQC and CQA activities were directed by the AMEC Project Resident. The AMEC Project Resident during this period was Mr. Thorne M. Clark. The Certifying Engineer and Project Manager Mr. Michael E. Nelson, PE, or his representative made periodic site visits to resolve technical issues and to review AMEC activities. Appendix C presents a summary of the AMEC staff on site during the period of January 22 through 24, 2013. sAprojects \1125m -cc &v lab liner extension\h2 - design \lab liner extension \roc report\lab liner roc report.docx