2014-02-07_REPORT - M1980244 (3)

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Cripple Creek & Victor Gold Mining Company PSES Pipe Rack Liner Extension Final Report Quality Assurance Monitoring & Test Results February 4, 2014 amecI9 Prior to the 80 -mil double -sided textured LLDPE geomembrane arrival to site, AMEC performed one conformance test at a frequency of one test per 106,260 square feet. The minimum specified testing frequency of one test per 150,000 square feet was exceeded. Testing frequency was based on AMEC's inventory of the 80 -mil double - sided textured LLDPE geomembrane. Conformance testing for the geomembrane used to construct the PSES Pipe Rack Liner Extension met specifications. Conformance test results are presented in Appendix K. 6.2 Deployment Monitoring Geomembrane panel deployment monitoring performed by AMEC included: • Observation of panel surface condition and panel overlap • Assignment of panel numbers • Verification of factory roll number and receipt of complete certification prior to allowing deployment • Measurement of sheet thickness • Documentation of deployed panel lengths • Development of panel layout record drawing Prior to the deployment of GCL, AMEC and ECA verified that the random fill subgrade was free of soft spots, protrusions, angular particles, abrupt grade changes, and loose soil. AMEC and ECA also verified the subgrade surface was free of desiccation cracks. Where the surface of the subgrade did not meet specifications, Ames repaired the area to meet project specifications. ECA provided written certification of subgrade acceptance prior to the placement of GCL. The subgrade acceptance certificates are presented in Appendix G. GCL was placed over the approved random fill subgrade by ECA. AMEC observed the placement of the GCL to ensure that appropriate overlap was achieved and that the GCL was placed in accordance with the Technical Specifications. AMEC assigned each geomembrane panel a number for this project, they were designated as P1 through P13. AMEC marked the panel designation and roll number directly on each panel after it was deployed. The geomembrane record drawing, showing the PSES Pipe Rack Liner Extension's geomembrane panel layout and destructive testing is presented as Sheet 2 of 2 in Appendix A. During geomembrane deployment, AMEC measured sheet thickness with digital calipers. The sheet thickness was measured at five random locations along each edge of each geomembrane panel. The average thickness specified for the 80 -mil geomembrane was 80 mils. Project specifications for 80 -mil geomembrane required 13