2015-05-13_REPORT - M1980244 - Laserfiche WebLink

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CRIPPLE CREEK & VICTOR GOLD MINING Co. • 1,14 ANGLOGOLD ASHANTI (COLORADO) amec SQUAW GULCH (VLF) WEEKLY REPORT foster wheeler One Cat 345 excavator removed excess SLF from the Phase 1 A bench in the vicinity of station A7+00. The material was placed upslope on approved subgrade for sebsequent grading. One Cat 312 excavator finish graded the south Phase 1 containment berm between stations A0+00 to C0+00. One excavator with attached vibratory tamper plate compacted the Phase 1 containment berm between stations A0+00 and C0+00. Laborers, with a fire hose connected to a water truck, maintained surface moisture. One hand operated vibratory plate compactor compacted the Soil Liner Fill material along the Phase 1 A bench next to the existing PSSA liner between approximately stations A8+00 through A10+00. One Cat 312E excavator trimmed the previously placed Phase SLF from along the edge of the A and C benches in the vicinity of stations A4+00 through A6+00 and C0+00 and C3+00. The above activities were performed per the project plans and specifications Drain Cover Fill: Continued the haul and placement of Drain Cover Fill (DCF) material between the Phase 1 B and DD benches upslope of approximately stations 134+00 through B13+00. GPS equipped Cat D6 LGP dozers were used to spread the material, pushing uphill while maintaining a minimum of two feet of cover between the LLDPE liner and the dozer tracks. The Cat 740 rubber tired haul trucks maintained a minimum cover depth of four feet above the geomembrane liner. Prior to DCF placement, high volume solution collection piping was placed on the approved LLDPE liner per the project drawings. Ames and Amec personnel were on site throughout the shift to monitor the integrity of the liner and piping during DCF placement. The above DCF activities were performed per the project plans and specifications. Underdrain System: Primary Underdrain: Complete. Secondary Underdrain: No activity Tertiary Underdrain: No activity Leak Detection: Completed the installation of the leak detection system outside the Phase 1 boundary between the Phase 1 containment berm and the leak detection manhole — excavated pipe trench, welded/installed solid HDPE piping, and installed the leak detection manhole. Completed backfill of the HDPE pipe and the pipe connection to the manhole. The above activities were performed per the project plans and specifications.