2012-08-24_REPORT - M1980244 - Laserfiche WebLink

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"Wilme In most areas, excluding flat areas were fills are started, the subgrade is keyed into as the fill progress. This is due to steep slopes that are adjacent to most fill areas. In this instance, the subgrade is inspected for organics and debris by an AMEC field representative prior to fill placement (keying into the subgrade). D) Structural Fill Placement A CAT 993 front -end loader and a CAT 992 front -end loader were used to load structural fill material from a borrow area designated by CC &V. The material was loaded into CAT 40 -ton articulating and CAT 777 haul trucks and hauled to fill areas. The fill excavation was assisted by various CAT dozers. Structural fill was placed in the areas shown on Figure 1. A CAT 330 excavator and a CAT 312 excavator with a hammer attachments "broke up" oversize boulders before they were placed in the fill. Structural fill was placed in 18" to 24" lifts using various CAT dozers, keying into existing slopes when necessary. Each lift was moisture conditioned using a tandem axle water truck (when necessary) and compacted using a 10 -ton vibratory smooth drum compactor, passing over the entire fill surface at least 4 times (method compaction technique was applicable). Subgrade temperatures were monitored by an AMEC field representative prior to fill placement. Fill material was not placed until the entire fill area was at or above 32 °F. Fill temperatures were then monitored every hour during ambient temperatures below 32 °F. No frozen material was placed during the week. E) Slope Contouring Slope contouring was performed using a CAT 330 excavator and a CAT D -6 dozer. Material generated during slope contouring was placed as structural fill at the top of the slope. F) Soil Liner Fill (SLF) No work performed during the week. G) Drain Cover Fill (DCF) No work performed during the week. Location This Week Cumulative Comments DCF Process - 158,613 DCF processing is temporarily paused Total - 158,613 DCF processing is temporarily paused H) Underdrain Construction of the Secondary underdrain under the Mill Site fill continued using a CAT 330 excavator to excavate approximately 385 linear feet of a 3'x4' trench along the surveyed alignment. The trench was as -built surveyed by Ames. 12 oz /yd2 geotextile and a 2' lift of Underdrain Filter Material (UFM) was then placed in the trench, "burrito wrapping" the UFM material with the geotextile. A 6 -inch lift of select structural fill (SSF) was then placed over the geotextile using a CAT 950 front -end loader. The SSF material was moisture conditioned and compacted using a vibratory plate compactor. A total of 385 linear feet of Secondary Underdrain was installed. Structural fill placement was then performed over the underdrain. Underdrain construction was observed by an AMEC field representative and found to be constructed in accordance with design drawings and project specifications. MEW Weekly Report WE 02.25.2012