2009-07-15_REVISION - M1980244 (28)

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AM% ame Earth $ Environmental F) Miscellaneous No work performed during the week. II) Underground Working A) Drilling No work performed during the week.. B) Mine Shaft/Stope Remediation Underground working 2036, located within the planned LOB Conveyor Transfer Station #5: The shaft will be located and surveyed by Ames. Conveyor Transfer Station #5: Remediation completed per the Remediation Plan dated 27 April 2009. This drift was defined as underground working 2040 and AMEC is waiting for survey data to add the working to the map and spreadsheet. Underground working 2030 (Raven upper tunnel) located within the LOB Delivery Road: As the cut advances the working has been backfilled (for safety) with 24-inch minus rock. It is anticipated the shaft will be removed once the LOB Delivery road is near final grade. Underground working 2015 (Tornado Shaft) was previously exposed. The shaft has been backfilled with oversize rock to within 30-feet of existing ground surface. C) Lateral/Slot Remediation No work performed during shift. III) Stormwater Management Structures A) LOB Stormwater Culverts No work performed during shift. B) Roadside ditch No work performed during shift. C) Best Management Practices (BMP) All silt fencing is in place. Best Management Practices are performed throughout the LOB project. IV)LOB Geosynthetics A) LLDPE Geomembrane 80 and 100 mil LLDPE On Saturday (4/25/2009) the decision was made that all panels be removed with the exception of the 5H: 1V slope tying into the Phase IV VLF geomembrane, due to fly rock damage. Panels were removed and replaced with 100 mil LLDPE single sided texture, one by one, beginning Sunday (4/26/2009). Panels 1-15 were replaced with panels 1 A-12A. On Monday (4/27/2009) the remaining panels 16-21 were replaced with panels 13A-16A. The in-place Soil Liner Fill was re- inspected and accepted prior to each new panel deployment. Tuesday (4/28/2009) all necessary repairs, destructive and non-destructive testing was completed. All tests and repairs were performed with in project specifications and all results were passing. A final inspection of the LOB Sheet 3 of 10 LOB Weekly Report WE 05.02.09.D.doc