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Ames performed confirmatory drilling activities associated with the Phase IVc construction azea on <br />known underground working UG-297. <br />Ames continued placement of Select Structural Fill (SSF) into "Shallow" underground working UG- <br />261. <br />Ames continued placement of Coarse Shaft Backfill (CSB) into "Deep" underground working UG-270. <br />Ames continued blast drilling of underground workings within Phase IVc at UG-267. Ames blasted <br />underground workings delineated by confirmation drilling at UG-267 on Mazch 5`s at 16:30. <br />Ames resumed placement of Concrete Plug (CP) concrete into "Deep Shafts" UG-267, UG-268, UG- <br />278, UG-286, and UNK-09. Ames placed three feet of concrete in accordance with IFC Drawing 12, <br />Detail 1. <br />Ames placed Cemented Rockfill (CR) at UG-222, UG-229, UG-234a, UG-246b, UG-254, UG-256, <br />UG-258, UG-260, UG-262, UG-282, and UG-521 by tapering the working, and placing 7 feet of CR in <br />accordance with IFC Drawing 12, Detail 1. <br />(See Attachment A for approximate construction locations for all Phase IV azeas.) <br />Field Monitoring and Testin¢ Activities <br />Golder observed construction activities associated with Phase IV earthworks. All construction <br />materials and soil materials placed were verified as suitable, and construction methods were in <br />accordance with project specifications. Removal of oversized and deleterious material from all fill <br />areas was observed. Golder conducted temperature measurements of fill material prior to placement. <br />No fill was placed until fill temperatures met the requirements of the specifications. <br />Golder observed construction of the Primary Underdrain in Phase IVa for trench dimensions (5' by <br />3'), slope (minimum 1%), geotextile (12 oz.), UF, geotextile overlap (2'), and SSF. A sample of <br />SSF was taken from placed material and failed to meet specifications. The SSF was rejected and <br />removed. <br />Golder observed placement of SF, SSF, CP, and CR. These materials were placed in accordance <br />with the drawings and specifications into excavated or open underground workings. Golder <br />previously obtained samples of SF, SSF, CP, and CR for laboratory testing. Materials supplied met <br />specifications. Ground Engineering conducted field testing and sampling of CP concrete as per <br />specifications, and will supply 28-day strength results. <br />Golder observed and documented excavation and remediation activities associated with the Phase IV <br />underground working construction. Full time monitoring was given to excavation of underground <br />workings. <br />Golder observed and documented confirmation drilling activities associated with the Phase IV <br />Phase IVa49h1archlP3].doc Golder Associates Inc. <br />