2016-01-14_REPORT - M1980244 (15)

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Cripple Creek & Victor Gold Mining Company Squaw Gulch VLF Phase 1 (9,550-foot Elevation Bench to Geomembrane Panel P1635) Final Report Quality Assurance Monitoring & Test Results January 2016 Project No.: 74201125N0 Page 4 • Observe and document construction of secondary and tertiary underdrains, including verification that Ames excavated the trenches to the minimum required dimensions and grades, and placed the materials according to the project technical specifications. Amec Foster Wheeler performed CQA laboratory testing of grain size, Atterberg limits, and moisture content of underdrain fill (UF) and select structural fill (SSF). • Observe and document SLF placement including observation of depth verification performed by Ames, grain size, moisture conditioning, and compaction of the material. Amec Foster Wheeler performed in-place nuclear density and moisture testing and CQA laboratory testing of grain size, moisture content, Atterberg limits, Standard Proctor, and permeability. Amec Foster Wheeler also provided visual monitoring of the SLF surface preparation and moisture conditioning for geomembrane placement to include a rolled, compacted surface free of desiccation cracks, abrupt grade changes, and sharp stones. Observation of excavation, backfill, and compaction of anchor trenches occurred as part of SLF placement. • Observe and document drain cover fill (DCF) placement above the 80-mil double-sided microspike LLDPE geomembrane within the Project to include verification of lift thickness, grade control, removal of deleterious materials, and that care was exercised in DCF placement to avoid geomembrane damage. Amec Foster Wheeler performed CQA laboratory testing of grain size and Atterberg limits. • Observe and document installation of High Volume Solution Collection System (HVSCS) piping which included placement of perforated Advanced Drainage System (ADS) piping placement directly on the geomembrane followed by DCF material placed over the pipe. • Monitor and document the ambient air temperatures and the temperatures of the fill materials, including SLF, in accordance with the project technical specifications. The ambient air and fill temperatures monitored during fill activities are presented on Tables 1 and 2, respectively. Note: The ambient air and fill temperatures are recorded from September 2015 through December 2015; reporting of this data is continued from the Squaw Gulch VLF Phase 1 (9,450’ to 9,550’ Bench) report by Amec Foster Wheeler. CQA/CQC Monitoring of Geosynthetics Installation Amec Foster Wheeler provided CQA monitoring of geosynthetics used for the Project. CQA services consisted of performing geosynthetics inventory and checking quality control certifications prior to geosynthetics deployment. CQA activities were performed in accordance with the Geosynthetics CQA Plan (Section 1400.2 of the project technical specifications, located in Appendix E). Geosynthetics CQA activities included: • Inventory of geosynthetic materials delivered to the project site