2009-07-15_REVISION - M1980244 (23)

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Cripple Creek & Victor Gold Mining Company Cresson Project ameO Quality Assurance Monitoring and Test Results Load Out Bin Relocation July 7, 2009 1.2.1 CQA Monitoring of Earthworks AMEC provided CQC testing and CQA testing and monitoring of earthworks for the LOB relocation. CQA testing and monitoring of earthworks was provided for in-place materials in accordance with the AMEC Earthworks CQA Plan. 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 because these tests were intended to assist Ames (Earthworks Contractor) in materials preparation rather than record testing. AMEC provided CQA laboratory and field testing, and monitored earthworks construction activities as follows: AMEC visually monitored and documented the remediation of underground workings within the LOB footprint, including verification that Ames excavated underground workings to the minimum specified dimensions and then installed Coarse Shaft Backfill (CSB), Concrete Plug (CP), Cemented Rockfill (CR), Fine Shaft Backfill (FSB), Select Structural Fill (SSF), Structural Fill (SF), and geogrid, as specified on the Issued For Construction (IFC) drawings. ¦ AMEC monitored site grading, including slope re-contouring and fill placement, lift thickness, moisture conditioning, temperatures, compactive effort, and use of suitable material for SF. AMEC performed CQA laboratory testing of grain size and Atterberg limits. AMEC visually monitored subgrade preparation to confirm that the subgrade surface was unyielding, free of organic matter and other unsuitable materials, and that the subgrade surface was compacted prior to Soil Liner Fill (SLF) placement. AMEC visually monitored the placement and compaction of SLF including observation of depth verification performed by Ames, particle size, moisture conditioning, and compaction of the fill. AMEC performed in-place density and moisture content testing, and performed CQA laboratory testing of grain size, moisture content, Atterberg limits, compaction, and permeability. AMEC also provided visual monitoring of the SLF surface preparation and moisture conditioning for geomembrane deployment, including verification that the surface was proof-rolled, compacted, and hand-worked so as to be free of desiccation cracks, abrupt grade changes, and sharp stones or objects. AMEC also observed the backfill and compaction of the anchor trenches. ¦ AMEC visually monitored the placement of Drain Cover Fill (DCF) within the LOB • footprint, including verification of lift thickness and grade control, identification and SAPROJECTS\1125E CCV CQA\H3 - CONSTRUCTION\LOB CERT REPORT\REPORT BODY\LOB CERT REPORT 2009.07.07.DOC