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Ames constructed a geogrid cap over UG-546. Ames placed two layers of geogrid in accordance with the drawings and specifications. I ~ Ames did not perform confirmation drilling in the Phase Nb area during this reporting period. Phase Nc Ames continued placement of Coarse Shaft Backfill (CSB) into "Deep" underground working UG-504. (See Attachment A for approximate construction locations for all Phase IV areas.) Field Monitoring and Testing 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. Removal of oversized and deleterious material from all fill areas was observed. Golder observed recontouring of the Phase III ore slope. Ore was regraded to approximately 4H:1 V and at no time was allowed off of the existing liner system. Golder observed construction of the Primary Underdrain Sump in Phase Na complying with Details 5/13 and 6/13 of the IFC Drawings. The portions of the anderdrain sump inlet and sump that were completed were constructed in accordance with the drawings and specifications. Golder observed construction of the Phase Na Leak Detection trench for trench dimensions, geomembrane welds, geotextile overlap, and LDF. The Leak Detection Trench was constructed in accordance with the drawings and specifications. Golder observed and tested placement of SLF in Phase Na, completing twenty-three in-situ density tests, six depth verification tests, and verified surface preparation. Prior to geomembrane deployment, the SLF met the requirements of the specification. Golder observed construction of the Temporary and Permanent Diversion channel for proper materials, thickness, grades, and compaction. The Temporary and Permanent Diversion channel activities were performed in accordance with the drawings and specifications. Golder observed geomembrane deployment, documenting ambient air temperature, panel dimensions, seaming, tie-in overlap, and seam testing (trial seams, pressure, vacuum, and destructive). Geomembrane placed in Phase IVa met specifications. Golder observed and documented excavation and remediation activities associated with the Phase IV underground working construction. Full time monitoring was given to excavation of underground workings. Golder observed placement of CSB. Coazse Shaft Backfill was placed in accordance with the rn.,~ rva ss rte:-~s.ao~ Golder Associates Inc.