Laserfiche WebLink
Cripple Creek & Victor Gold Mining Company <br />Squaw Gulch VLF Phase 1 <br />(9,550-foot Elevation Bench to Geomembrane Panel P1635) <br />Final Report <br />Quality Assurance Monitoring & Test Results <br />January 2016 <br />Project No.: 74201125N0 Page 18 <br />4.2 Field Testing and Monitoring <br />Amec Foster Wheeler observed earthworks fill operations to verify lift thickness, <br />adequate compaction, ambient air and fill temperatures and acceptable moisture <br />contents. Holes made in the SLF during testing were backfilled and tamped with fine <br />bentonite powder. Amec Foster Wheeler standardized the nuclear gauges at the start of <br />each day according to ASTM D6938. <br /> Underdrains <br />Amec Foster Wheeler verified that the underdrains were constructed as specified in the <br />IFC Drawings and project technical specifications. UF material was placed a minimum <br />of 2 feet deep by 4 feet wide in the secondary underdrain trenches and 2 feet deep by <br />3 feet wide in the tertiary underdrain trenches. All oversized and unsuitable material was <br />removed from the UF prior to final placement. Amec Foster Wheeler monitored the <br />installation of the geotextile in the underdrains, ensuring that the geotextile overlap was <br />adequate, and a minimum of 6 inches of SSF was placed on the top of the geotextile. <br /> Structural Fill <br />Amec Foster Wheeler monitored subgrade preparation, including verification that Ames <br />compacted the SF with a smooth drum vibratory compactor or equivalent approved <br />methods. It was also verified that Ames removed protruding rocks from the SF surface <br />prior to SLF placement, the fill was moisture conditioned during placement, and the final <br />surface was smooth and unyielding prior to SLF placement. <br />All of the SF material within the Project contained more than 30 percent by weight larger <br />than ¾-inch, and was placed by method specification per project technical specification <br />2200, Section 3.06 Subsection B. Amec Foster Wheeler verified that the maximum <br />particle size of the SF did not exceed 24 inches and that lifts were not larger than 1-½ <br />times the maximum particle size. It was also verified that Ames made a minimum of four <br />passes with a 10-ton static drum weight smooth drum vibratory roller or approved <br />equivalent as outlined in Appendix N. <br /> Soil Liner Fill <br />Field testing for SLF included monitoring of placement and preparation of the finished <br />SLF surface for geomembrane deployment, testing in-place moisture and density with a <br />nuclear gauge, and depth verification. <br />Field Monitoring <br />Amec Foster Wheeler observed SLF placement to verify soil temperatures when <br />appropriate, lift thickness, adequate compaction, acceptable moisture conditions, final