2014-02-07_REPORT - M1980244 (7)

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Cripple Creek & Victor Gold Mining Company Mill Site Earthworks Project Final Report Quality Assurance Monitoring & Test Results January 31, 2014 TMA supporting CQA monitoring and testing documentation are presented in appendices attached to this report. 1.2.1 CQA Monitoring of Earthworks AMEC provided CQC testing and CQA testing and monitoring of earthworks for the Mill Site Earthworks Project. CQA testing and monitoring of earthworks was provided for in -place materials in accordance with the AMEC Earthworks CQA Plan (Section 1400.1 of the Project Specifications; see Appendix E). The earthworks material specifications for this project are summarized in Table 1. CQC earthworks testing was provided to support the contractor during the manufacture of materials and prior to material placement. The CQC test results are not included in this report as these tests were intended to assist the contractor in materials preparation rather than record testing. All CQA testing results are included. AMEC provided CQA laboratory and field testing, and monitored earthworks construction activities as follows: • AMEC monitored topsoil stripping, site grading, including slope re- contouring and fill placement, lift thickness, moisture conditioning, temperatures, compaction efforts, in -place nuclear density testing, and use of suitable material for Overburden Fill (OVF). AMEC performed CQA laboratory testing of grain size and Atterberg limits. • AMEC visually monitored the construction of the Secondary Underdrain, including verification that Ames excavated trenches to the minimum required dimensions and grades, and placed materials as specified. AMEC performed CQA laboratory testing of grain size, Atterberg limits, and moisture content of the Underdrain Filter Material (UFM) and Select Structural Fill (SSF). • AMEC visually monitored and documented the remediation of underground workings within the Mill Site Earthworks Project footprint, including verification that Ames excavated underground workings to the minimum specified dimensions and installed Coarse Shaft Backfill (CSB), cemented rockfill, concrete, geogrid, SSF, and Structural Fill (SF) as specified on the Issued for Construction (IFC) drawings. • AMEC visually monitored subgrade preparation to confirm the subgrade surface was unyielding; free of organic matter and other unsuitable materials; and the subgrade surface was compacted prior to Soil Liner Fill (SLF) placement. • AMEC visually monitored the placement and compaction of SLF including depth verification performed by Ames, particle size, moisture conditioning, and compaction of the fill. In place nuclear moisture density testing was conducted as well as CQA laboratory testing of grain size, moisture content, Atterberg limits, Proctor, and permeability. AMEC also monitored the SLF surface preparation and 2