2004-10-18_REVISION - M1980244 (27)

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Phase IVc Summary No. 4 Page 3 043-2170 Golder observed placement, compaction, and moisture conditioning of SLF in the Phase IVc OSA • for subgrade preparation, thickness, compaction, moisture content, and materials. The Golder CQA Earthworks monitor performed thirty-one nucleaz moisture-density tests (SLNc-023 through SLNa 53) and performed seven nucleaz moisture-density retests on SLF that required reworking (SLNc- 23a, 23b, 25a, 27a, 30a, 34a and 42a) located within the Phase IVc OSA. The retested SLF met the requirements of the specifications. Field test results aze presented in Attachment B. Golder observed geomembrane deployment, documenting ambient air temperature, panel dimensions, thickness, seaming, tie-in overlap, and seam testing (trial seams, pressure, and destructive). Geomembrane placed in the Phase IVc OSA met the project specifications. Golder visually observed the placement of DCF in the Phase IVc OSA azea. Golder CQA monitors (one monitor per dozer when dozers aze greater than 50 ft apart) observed DCF placement and verified minimum thickness of 2 feet for finish grade, and 4 feet for haul traffic. Laboratory Tests Golder obtained QC samples of bentonite-amended soil liner fill (SLF-QC-10, and SLF-QC-11) and drain cover fill (DCF-QC-O1). Laboratory index testing was conducted on samples of bentonite- amended SLF and DCF 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 are available at the Golder field trailer. • Golder obtained QA samples of soil liner fill (SLFc-QA-02, SLFc-QA-03, and SLFc-QA-04) for laboratory testing. SLFc-QA-04 is incomplete and will be reported in the following weekly. The completed samples tested met the requirements of the specifications and results aze presented in Attachment B. Meetincs CC&V held Weekly Contractors' meetings on May 25 and June 1, 2004. Items discussed included Safety, Environmental, Schedule, QC documentation, and CQA. The next weekly meeting will be held on June 8, 2004 at 10:00 AM. Golder Personnel On-Site A summary of all Golder CQA personnel on site during this reporting period is presented in Attachment A. Sincerely, Ron DiDonato Project Resident • Phan Nc 06 May 23-Iune52004.doc Golder Associates inc.