2004-10-18_REVISION - M1980244 (27)

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Phase IVc Summary No. 2 Page 2 043-2170 \J • • and cemented rock-fill portion of the remediation was completed last construction season. Future placement of geogrid will complete remediation of the working. Ames constructed Secondary Underdrain at the west Phase IVb/ IVc tie-in and on the Nc slope on Chicken Hawk Hill. Ames constructed approximately 210 feet of Secondary Underdrain. Ames began constntction of the Phase IVc Leak Detection Trench (LDT) within Phase IVc along the west end of the VLF on Chicken Hawk Hill. Ames constructed approximately 650 feet of LDT. Ames continued production of bentonite-amended SLF at the screen and pug mill plant located above the Ames materials yazd. A map of the area worked during this reporting period is provided in Attachment C. Field Monitorine and Testing Activities Golder observed construction activities associated with Phase IVc earthworks. All construction materials and soil materials placed were verified as suitable, and construction methods were in accordance with project specifications. Golder observed placement and compaction of SF in the Phase IVc OSA for subgrade prepazation, lifr thickness, compaction, moisture content, and materials used. The Golder CQA Earthworks Monitor performed visual observations to verify conformance with method specifications. SF placed met the requirements of the project specifications. Golder observed construction of LDT in Phase IVc for trench dimensions, slope, and materials used. Golder observed construction of Secondary Underdrain in Phase IVc for proper trench dimensions, slope, materials, geotextile over-lap, and material thickness. Laboratory Tests Golder obtained QC samples of bentonite-amended soil liner fill (SLF-QC-06, and SLF-QC-07). Laboratory index testing was conducted on samples of bentonite-amended SLF at either the Golder Soils Laboratory in Lakewood, Colorado, or at the field trailer to verify suitability of materials prior to use in the field. A summary of QC laboratory test results for SLF materials conducted after completion of the 2003 construction season is available at the field trailer. Golder obtained one sample of Underdrain Fill (LIFc-O1) for laboratory testing. The sample tested met the requirements of the specifications and results aze presented in Attachment B. Meetines CC&V held Weekly Contractors' meetings on Apri127 and May 4, 2004. Items discussed included Safety, Environmental, Schedule, QC documentation, and CQA. The next weekly meeting will be held on May 11, 2004 at 10:00 AM. rn~rvooz,~d~zs-~YS, zoon e~ Golder Associates lnc.