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AAM <br />amec <br />Earth 8 Environmental <br />III) Storm Water Management Structures <br />A) Best Management Practices (BMP) <br />Silt fencing has been put in place and Best Management Practices are being observed throughout <br />the LOB project. <br />B) LOB Storm Water Culverts <br />Culverts were installed at Conveyor Corridor #4 and at the Transfer Station #5 access road. Six <br />inches of pipe bedding material was placed, using a CAT 345 excavator, for each culvert. The pipe <br />bedding material was moisture conditioned and compacted using a CAT 563 vibratory smooth <br />drum compactor. Each culvert was backfilled evenly using pipe bedding material. Backfilling was <br />performed using a CAT 345 excavator, a walk-behind sheep's foot compactor, and a CAT 563 <br />vibratory smooth drum compactor. Eight nuclear density tests were performed during the culvert <br />installation with results averaging 95% of maximum dry density. <br />Installation of the 42" culverts for the LOB Storm Water crossing continued. Backfilling of the in- <br />place culverts was performed using a CAT 345 excavator. Pipe Bedding Material was placed in <br />12" compacted lifts on each side and between the culverts, bringing the backfill up evenly. The <br />culverts were backfilled with Pipe Bedding Material two feet above the installed culverts. The <br />material was moisture conditioned and compacted using a walk-behind sheep's foot compactor and <br />a CAT 563 vibratory smooth drum compactor (after sufficient cover). Five nuclear density tests <br />were performed during the backfill, with results averaging 96% of maximum dry density. <br />Moisture-density relations were obtained in accordance with ASTM D-698-07. Structural fill was <br />then placed to bring the area to the existing haul road elevation using a CAT D-6 dozer. The <br />structural fill was placed in 12" lifts. The material was moisture conditioned and compacted using <br />a CAT 563 vibratory smooth drum roller, passing over the entire surface at least 4 times. The <br />remainder of the culvert crossing will be installed when materials arrive onsite. <br />CQA ACTIVITIES: <br />SUMMARY: <br />Field Observation Summary <br />The CQA activities performed consisted of observing, documenting and recording the construction <br />activities of the contractor. <br />AMEC observed fill placement on the LOB Delivery Road throughout the week. <br />AMEC observed the remediation of Underground Workings #2040 and the stope between #2015 and <br />#2016. <br />AMEC observed the LOB Storm Water Culvert installations. <br />AMEC observed excavation and structural fill placement at Conveyor Corridors #3 and #4. <br />Sheet 3 of 8 <br />LOB Weekly Report WE 06.13.09.D.doc