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Phase IVb Weekly Summary No. 21 Page 3 003-2203 • 105 were deployed, seamed, and pressure tested by Poly-Flex. Destmctive fusion and extrusion seam samples DFb-31 through DFb-33 and DXb-09 through DXb-11 were marked and removed. Destructive fusion and extrusion seam peel and shear tests on 100-mil smooth LLDPE geomembrane deployed during this reporting period passed per project specifications. A map of the azea worked during this reporting period is provided in Attachment C. Phase IVc Ames performed no construction activities in the Phase IVc area during this reporting period. Field Monitoring and Testine Activities Golder observed construction activities associated with Phase IV earthworks. All construction materials and soil materials placed were verified as suitable, and construction methods were in accordance with project specifications. Golder observed the placement of secondary and tertiary HVSCS piping in the Phase IVb PSSA and Phase IVb OSA, verifying construction per the project plans. Golder visually observed the placement of DCF in the Phase IVb PSSA and OSA areas. Golder CQA monitors (one monitor per dozer when dozers are greater than 50 ft apart) observed DCF placement and verified minimum thickness of 2 feet for finish grade, 4 feet for HVSCS primary pipe locations, 5 Feet for 773 equipment, and 10 feet for haul road construction and equipment. Golder visually observed the placement of SDCF and ore in the vicinity of the Phase IVb vertical risers on a part-time basis. Golder visually observed construction of the HVSCS vertical risers in the Phase IVb sump on a part-time basis. Golder visually observed removal of DCF from the Phase IVa anchor trench and the Phase III toe at Phase IVb tie-in areas. Damage caused to geomembrane was marked for subsequent repair. Golder observed anchor trench excavation in the Phase IVb OSA for proper location and dimension (2' wide by 3' deep), Anchor trench excavation met or exceeded the requirements of the specifications. Golder observed underground working excavations in the Phase IVb OSA on the south side of Substation Hill. Golder observed placement, compaction, and moisture conditioning of SLF in the Phase IVb OSA for subgrade preparation, thickness, compaction, moisture content, and materials. Golder CQA monitor performed 27 nuclear moisture-density tests (SLNb-129 through SLNb-153), and 10 depth verification checks (SLDb-86 through SLDb-95) on SLF placed within the Phase IVb OSA. Two of the nucleaz moisture-density tests (SLDb-139 and SLDb-144) failed to meet project specifications with regard to compaction. The areas were reworked, retested, and met the requirements of the • specifications. The nuclear moisture-density results summary is presented in Attachment B. an,:e,~rozu~~ea-m~,azooaza« GolderASSOCiateSII1C.