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Phase IVc Summary No. 18 Page 2 043-2170 eastern portion of the VLF. SLF material was tested, condifioned, reworked, retested, and maintained prior to SLF surface acceptance. Ames continued excavation of the Phase Nc anchor trench on the eastern section of the Phase Nc VLF. Ames excavated approximately 50 feet of anchor. trench in preparation for geomembrane installation during this reporting period. Ames continued production of bentonite-amended SLF at the screen plant and pug mill located above the Ames materials yard. Ames also continued production of Drain Cover Fill (DCF) material at the screen plant by the secondary crusher. Poly-Flex continued deployment of 80-mil single-sided textured LLDPE geomembrane in the Phase Nc OSA. Geomembrane was installed in the Phase Nc OSA on the south facing slope of Raven Hill downward to the Phase IVb/IVc tie-in. Poly-Flex deployed 80-mil single-sided textured LLDPE geomembrane over an area of approximately 98,868 square feet in the Phase Nc OSA during this reporting period. Geomembrane panels C-776 through C-795 were deployed, seamed, and tested by Poly-Flex. Destructive fusion and extrusion seam samples DFc-279 through DFc-289 and DXc-29 through DXc-30 were mazked and removed. Destructive fusion and extrusion seam peel and shear testing on samples DFc-272 through DFc277, DFc-279 through DFc-289, and DXc-29 through DXc-30 were performed and passed per project specification. Ames continued hauling, placement and grading of DCF material into the Phase Nc OSA in the central and eastem sections of the VLF, Raven Hill area. Ames placed DCF material and High Volume Solution Collection (HVSC) piping per the project plans onto approved geomembrane panels. A map of the area worked during this reporting period is provided in Attachment C. Field Monitoring and Testing Activities Golder observed construction activities associated with Phase Nc earthworks. All construction materials and soil materials placed were verified as suitable, and construction methods were in accordance with project specifications. Golder observed the excavation and construction of the LDT in the Phase Nc VLF for trench dimensions (1' wide by 1' deep), slope, and materials used. Golder observed excavation of the Phase Nc anchor trench for proper location, dimension (2' wide by 3' deep) and maintenance prior to geomembrane deployment. Anchor trench excavation met or exceeded the requirements ofthe specification. Golder observed placement, compaction, and moisture conditioning of SLF in the Phase Nc OSA for subgrade prepazation, thickness, compaction, moisture-content, and materials used. The Golder CQA Earthworks Monitor performed ten nuclear moisture-density tests (SLNc-231 through SLNc-240) and performed no nucleazrnoisture-density retests. Field test results aze presented in Attachment B. PhaselVC lS September OS-September 112W4 Golder Associates lnc.