2011-08-16_REPORT - M1980244 (4)

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amed C) Soil Liner Fill 1) VLF Soil liner fill (SLF) placement continued in the areas shown on Figure 2. Subgrade was approved and moisture conditioned prior to placement using a tandem -axle water truck. The SLF material was moisture conditioned at the temporary stockpile and loaded into 40 -ton articulating haul trucks using a John Deere 744 front -end loader. Placement of the remaining SLF was performed using various CAT dozers and one skid steer loader in a one -foot compacted lift. Moisture conditioning of SLF material was performed in place using a tandem axle water truck and compaction was achieved using a 10 -ton vibratory smooth drum compactor. Nuclear density testing, moisture verification, and depth check testing was performed with results within project specifications. Test locations were surveyed by Ames. D) High Volume Solution Collection System 1) High Volume Solution Collection Piping Placement of the high volume collection system continued at the DCF placement area shown on Figure 5, advancing in front of the placement. CPeP was placed and sandbagged in accordance with design drawings and project specifications. 2) Drain Cover Fill (DCF) Drain cover fill (DCF) placement within the Phase 5 VLF continued. DCF was placed in the areas shown on Figure 5. The DCF was hauled from the processing area to the placement area using 40 -ton articulating haul trucks. The DCF was placed in a 2 -foot lift using various CAT dozers except where haul routes were established. Haul route consisted of five -foot lifts to be spread into 2 -foot lifts later. Laborers were present at all times during placement holding the high volume collection piping in place, removing debris /sandbags, and assisting the dozer operator with lift thickness. All DCF was placed on previously approved primary geomembrane. AMEC field representatives monitored the DCF placement constantly. E) Leak Detection Trench 1) VLF A portion of the leak detection system was installed between stations H2 +00 ( + / -) to H6 +00 ( + / -) approximately 150 left of centerline. The l'xl' trench was excavated using a CAT 312 excavator. 40mil HDPE geomembrane and 12oz/ft geotextile were placed in the trench. Three -inch CPe pipe was then placed over the geotextile. Approved leak detection fill (LDF) was placed in the trench using a CAT 950 front -end loader and laborers. The geotextile was wrapped and overlapped, encapsulating the LDF and 3" CPe pipe. SLF material was then placed over the trench. Leak detection trench construction was observed and inspected by an AMEC field representative and found to be constructed in accordance with design drawing and project specifications. F) Miscellaneous 1) VLF A CAT D -6 dozer and 40 -ton articulating haul trucks were used to create a haul route near station E22 +00 ( + / -). AMEC observed construction activities in the area to ensure equipment didn't travel near the Phase 5 high volume risers. VLF Weekly Report WE 07.23.2011