2011-11-19_REPORT - M1980244 (4)

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ameO compactor, passing over the entire fill surface at least 4 times (method compaction technique was applicable). D) Soil Liner Fill 1) VLF Existing Soil Liner Fill between stations B 12 +00 ( + / -) and B 14 +00 ( + / -), approximately 0 to 200 feet right of centerline was moisture conditioned, re- worked and re- graded. Moisture conditioning was performed using a tandem -axel water truck and compaction was performed using a 10 -ton vibratory smooth drum compactor. Density and depth checks were performed on the SLF material. One record sample was collected from the SLF material. (see Figure 2 for previously placed soil liner fill) E) Low Volume Solution Collection System 1) Low Volume Solution Collection Piping Placement of the low volume solution collection system continued at the LVCSF placement area shown on Figures 5a and 5b, advancing in front of the placement. Four -inch CPeP was placed and sandbagged in accordance with design drawings, constructing the mainline and the tertiary lines. The secondary geomembrane in the area was accepted prior to pipe placement. Installation of the low volume solution collection risers was performed placing the pipe in the Phase 5 VLF. Construction of the low volume solution collection risers began, fusing three sections of 18" HDPE pipe. Perforations were then drilled in each section from the end cap to 12' up the pipe. A Komatsu 300 excavator and a CAT 312 excavator were used to place the three 18" HDPE pipes on temporary sand bags to protect the secondary geomembrane. A rub sheet was also installed below the bottom 10' of the risers. The pipes were positioned in accordance with design drawing and the sand bags were removed from beneath the risers. LVSCF was then placed over the risers covering them with three feet of cover. LVSCF placement for this task is included and shown on Figure 5b. The open ends of the pipes were covered at all times and remain covered. An AMEC field representative observed and inspected the low volume solution collection riser construction. Installation of the risers was found to be performed in accordance with design drawings and project specifications. 2) Low Volume Solution Collection Fill (LVSCF) Low volume solution collection fill (LVSCF) placement within the Phase 5 VLF continued. LVSCF was placed in the area show on Figures 5a and 5b. The LVSCF was hauled from the processing area to the placement area using CAT 740 haul trucks loaded by a CAT 988 front - end loader. The LVSCF was placed in a 3 -foot lift using two CAT D -6 LGP dozers, a CAT D- 7 LGP dozer, a CAT D -8 LGP dozer, and a CAT D -8 narrow pad dozer (haul route construction only) except where haul routes were established. Haul routes consisted of five - foot lifts, to be spread into 3 -foot lifts later. Laborers were present at all times during placement holding the low volume collection piping in place, removing debris /sandbags, and assisting the dozer operator with lift thickness. All LVSCF was placed on previously approved secondary geomembrane. AMEC field representatives monitored the LVSCF placement constantly. VLF Weekly Report WE 09.11.10.1)