2014-02-07_REPORT - M1980244 (3)

Home Browse Search

Cripple Creek & Victor Gold Mining Company PSES Pipe Rack Liner Extension Final Report ameO Quality Assurance Monitoring &Test Results February 4, 2014 2.0 SUMMARY OF EARTHWORK CONSTRUCTION Earthworks activities associated with the PSES Pipe Rack Liner Extension included the following: • Site grading • Random fill subgrade preparation • DCF placement above the primary geomembrane layer • Compaction of DCF Ames generally used the following equipment during construction: • Caterpillar 320C Excavator • Komatsu Excavator • John Deere 35D Mini Excavator • Bobcat T705 Skid -steer Loader • Caterpillar CS56 Smooth Drum Compactor • Vibratory Plate Compactors • Jumping Jack Compactors Weather data for the PSES Pipe Rack Liner Extension construction activities from the period of September 2013 through November 2013 are presented in Table 2. 2.1 Subgrade Preparation Ames re- contoured the entire surface of the PSES Pipe Rack Liner Extension footprint. The surface was smooth, firm, and unyielding, and free of vegetation, construction debris, sticks, sharp rocks, void spaces, ice, abrupt elevation changes, standing water, and cracks larger than one - quarter inch in width. The quality of the finished surface was then maintained until the GCL was placed. AMEC and ECA provided formal random fill subgrade approval prior to GCL deployment. Acceptance forms are presented in Appendix G. 2.2 Drain Cover Fill Ames placed DCF at the PSES Pipe Rack Liner Extension during November 2013, with placement being completed on November, 15 2013. Ames placed approximately 4,407 cubic yards of DCF in the PSES Pipe Rack Liner Extension. The material was placed in a minimum 2- foot -thick lift over the geomembrane. Ames placed DCF in an uphill direction on any slopes steeper than 4H:1 V. The first lift was placed in a minimum 24 -inch lift accordance with the Technical Specifications; the remaining DCF 5