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TlAm <br />4a <br />In most areas, excluding flat areas were fills are started, the subgrade is keyed into as the fill <br />progress. This is due to steep slopes that are adjacent to most fill areas. In this instance, the <br />subgrade is inspected for organics and debris by an AMEC field representative prior to fill <br />placement (keying into the subgrade). <br />D) Structural Fill Placement <br />A John Deere 850 excavator and a CAT 385 excavator were used to excavate structural fill <br />material from a borrow area designated by CC &V. The fill excavation was assisted by various <br />CAT dozers. <br />Structural fill was placed in the areas shown on Figure 1. Structural fill was placed in 18" to 24" <br />lifts using various CAT dozers, keying into existing slopes when necessary. Each lift was moisture <br />conditioned using a tandem axle water truck (when necessary) and compacted using a 10 -ton <br />vibratory smooth drum compactor, passing over the entire fill surface at least 4 times (method <br />compaction technique was applicable). <br />Subgrade temperatures were monitored by an AMEC field representative prior to fill placement. <br />Fill material was not placed until the entire fill area was at or above 32 °F. Fill temperatures were <br />then monitored every hour during ambient temperatures below 32 °F. No frozen material was <br />placed during the week. <br />E) Slope Contouring <br />No work performed during the week. <br />F) Soil Liner Fill (SLF) <br />No work performed during the week. <br />G) Drain Cover Fill (DCF) <br />Processing of Drain Cover Fill (DCF) was performed at the DCF process area using a CAT D -9 <br />dozer during night shift. The processed material was hauled to a stockpile area, on Dump 4 <br />designated by CC &V using 40 -ton articulating haul trucks. The stockpile pile was maintained <br />various CAT dozers. <br />Location <br />This Week <br />Cumulative <br />Comments <br />(tons) <br />(tons) <br />DCF Process <br />18,343 <br />18,343 <br />Total <br />18,343 <br />18,343 <br />II) Underground Mine Workings <br />A) Discovery <br />During topsoil stripping, an Underground Working was encountered. The working was given a <br />number (UG #4006) by an AMEC representative and surveyed by Ames. A Hitachi 350 excavator <br />was used to clean out the accessible portion of the working. Confirmatory drilling will be <br />performed later to identify the extent of the working. The working was bermed off and caution tape <br />was placed around the shaft for safety. <br />MEW Weekly Report WE 01.07.2012 <br />