2009-03-25_REPORT - M1980244 (6)

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AWN ame Earth & Environmental CQA ACTIVITIES: SUMMARY: The CQA activities performed consisted of observing, documenting and recording the construction activities of the contractor. AMEC witnessed the delivery of the 80 mil and 100 mil LLDPE geomembrane liner on Wednesday and Thursday. Observed work activities during the week within the LOB/Delivery Road from Station 30+00 advancing to Station 16+00. All work performed was cut to Dump 4. Continue drilling the LOB/Delivery Road cut for planned blasting next week. NOTE: Rockbreakers will be drilling on the LOB Delivery Road cut this Saturday. AMEC is not required to be on site for this work. Night shift work and day shift work consisted of cut to fill from the LOB/Delivery Road, Approximate Station 2+00 to 8+00 to the fill in the VLF from Station K4+00 to K8+00, 0-100 feet left. Intermittent SLF processing at Dump 5 due to continued mechanical problems has resulted in reduced production. Quality of produced material was not affected. A different plant is due on site during the week of the 21 st of March. Saturday work was postponed due to Rockbreakers drilling schedule. Testing Summary: Testing has continued this past week with additional samples of clay gathered from Dump 5, South Crescent clay storage and from a stockpile of augmented clay with bentonite from the previous Phase of construction. This sample is located in the Arequa Process area. Permeability testing is in progress on samples sent last week. Progress on the laboratory work is going well. Tentative results of SLF-8, 9 and 12 indicate the fastest result is 7E-07 @ +2% and run at 5 PSI. Additional samples have been sent to Denver for permeability testing. Sample Summary Description Comments SLF-8, 9, 12, 13C 17-20C Unprocessed and processed clay, testing in-progress. LOB-SF-1 Structural fill, LOB Delivery Road, Complete Sheet 4 of 11 LOB Weekly Report WE 03.14.09.13