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amedO �,���,��:,,�:�,t,, <br />IV) Storm Water Management Structures <br />A) Control Structures <br />No work performed during the week. <br />B) Best Management Practices <br />Best Management Practices are being observed throughout the Phase 5 VLF Project. Storm water <br />controls were maintained throughout the week. Precipitation was not substantial throughout the <br />week. <br />Storm water controls are being constructed in the East Cresson clay borrow as the area is <br />constructed. <br />V) VLF Primary Underdrain <br />Construction of the primary underdrain continued using a CAT D -9 dozer to rip frost in the area. The <br />frost and overburden material was loaded into CAT 777 haul trucks using a John Deere 850 excavator <br />and hauled to the overburden stockpile area east of the east perimeter road near stations A29 +00 ( + / -) <br />to A32 +00 ( + / -) right of centerline. <br />Construction of the Primary Underdrain continued using a CAT 330 excavator and a CAT D -9 dozer <br />to excavate the underdrain trench. Subgrade was inspected by an AMEC reF,resentative and found to <br />be competent and acceptable for geotextile placement. Geotextile (12oz /yd ) was then deployed and 6" <br />CPe perforated piping was then placed and coupled in the trench. Underdrain Fill material (UFM) was <br />then placed in a 3 -foot lift in the trench using a CAT 980 front -end loader and the geotextile was <br />wrapped around the UFM, overlapping a minimum of 2 feet. Select structural fill was then placed in a <br />minimum 6" lift using a CAT 980 front -end loader and moisture conditioned (when necessary). <br />Compaction was performed using a vibratory plate compactor. The remainder of the trench was <br />backfilled using a structural fill excavated from the trench previously. Approximately 250 linear feet <br />of the Primary Underdrain was installed during the week. <br />VI) VLF Geosynthetics <br />No work performed during the week. <br />CQA ACTIVITIES: <br />SUMMARY: <br />The CQA activities performed consisted of observing, documenting and recording the construction <br />activities of the contractor. <br />AMEC observed and documented ambient and fill temperatures, as well as the placement of structural fill <br />within the Phase 5 VLF fill area. <br />AMEC observed clearing, grubbing, and stripping topsoil at the East Cresson Clay Borrow. <br />AMEC observed the remediation of Underground Workings #3006 and #3007 constantly. <br />AMEC observed confirmatory drilling at Underground Working #3012 constantly. <br />VLF Weekly Report WE 02.06.10.D.doc <br />