2012-12-27_REPORT - M1980244 (8)

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ameO 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 work associated with the Cresson Project was performed under specific criteria established in Amendment Nos. 8 and 9 of Permit Number 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 Environment and Infrastructure (AMEC) from October 10 through October 12, 2011 for the extension of the liner system at the VLF Load Out Bin (LOB). The general location for the LOB Liner Extension is presented on Figure 1. 1.1 Project Description 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 was completed in 2004. Phase 5 was permitted in 2008 and was completed in 2011. As part of the construction activities, the LOB was moved from its previous location to a new pad located to the north end of the VLF, as shown on Figure 1. The liner system was extended to allow containment of the haul truck traffic at the LOB in October 2011. The composite liner system consisted of a geosynthetic clay liner (GCL) and 80mil LLDPE Single Sided Texture. 1.2 Construction Quality Assurance /Quality Control AMEC provided CQA monitoring and testing services, and prepared this report describing the monitoring and test results for the LOB Liner Extension. Figures and supporting CQA monitoring and testing documentation are presented in appendices attached to this report. 1.2.1 CQA Monitoring of Earthworks AMEC provided CQA testing and monitoring of earthworks for the LOB Liner Extension. CQA testing and monitoring of earthworks was provided for placed materials in accordance with the AMEC Earthworks CQA Plan. The earthworks material specifications for this project are