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Phase IVb Weekly Summary No. 25 Page 3 003-2203 <br />Golder observed placement, compaction, and moisture conditioning of SLF in the Phase IVb OSA <br />for subgrade prepazation, thickness, compaction, moisture content, and materials. The Golder CQA <br />Earthworks monitor performed six nucleaz moisture-density tests (SLNb-169 through SLNb-174) <br />and performed ten nuclear moisture-density retests on SLF that required reworking (SLNb-169a, - <br />169b, -169c, -170a, -170b, -171a, -171 b, -172a, -172b, and -173a) located within the Phase IVb <br />OSA. The retested SLF met the requirements of the specifications. Field test results are presented in <br />Attachment B. <br />Golder observed placement of secondary and tertiary HVSCS piping in the Phase IVb OSA, <br />verifying construction and layout per the project plans. <br />Golder visually observed placement and grading of DCF in the Phase IVb OSA. Golder CQA <br />monitors (one monitor per dozer when dozers aze greater than 50 ft apart) observed DCF placement <br />and verified minimum thickness of 2 feet for finish grade, 4 feet for HVSCS primary pipe locations, <br />5 feet for 773 equipment, and 10 feet for haul road construction and equipment. <br />Golder visually observed removal of DCF from the Phase Nb / Phase I /Phase II tie-in azea, at the <br />old LOB pad access haul road. Golder marked damage caused to the geomembrane for subsequent <br />repair during Phase IVb geomembrane tie-in construction. <br />Golder observed anchor trench excavation in the Phase IVb OSA for proper location and dimension <br />(2' wide by 3' deep). Anchor trench excavation met or exceeded the requirements of the <br />specifications. Golder also provided part-time observation for anchor trench backfilling, verifying <br />construction per project plans. <br />Golder observed geomembrane deployment, documenting ambient air temperature, panel <br />dimensions, thickness, seaming, tie-in overlap, and seam testing (trial seams, pressure, vacuum, and <br />destructive). Geomembrane placed in the Phase IVb OSA met the project specifications. <br />Laboratory Tests <br />Golder obtained QA samples of Drain Cover Fill (DCFb-09 and DCFb-10), Bedding Fill (BFb-OS), <br />and Soil Liner Fill (SLFb-17). Laboratory index testing was conducted on samples of Drain Cover <br />Fill (DCFb-09 and DCFb-10), Bedding Fill (BFb-OS), and Soil Liner Fill (SLFb-17) to verify <br />suitability of materials used. Laboratory test results are presented in Attachment B. <br />Meetines <br />CC&V held a Weekly Contractors meeting on July 8, 2003. Items discussed included Safety, <br />Environmental, Schedule, and CQA. The next weekly meeting will be held on July 15, 2003 at <br />10:00 AM. <br />Golder Personnel On-Site <br />A summary of all Golder CQA personnel on site during this reporting period is presented in <br />Attachment A. <br />Phase IV6351ulybluly12, 2003 Golder Associates lnc. <br />