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Phase IV Weekly Summary No. 45 Page 3 <br />003-2203 <br />Ames continued to place Concrete Plug (CP) concrete into "Deep Shafts" UG-222, UG-229, UG-234a, <br />UG-242, UG-246b, and UG-521. Ames placed three feet of concrete in accordance with IFC Drawing <br />12, detail 1. <br />Ames performed confirmatory drilling activities associated with the Phase Nc construction azea on <br />known underground workings UG-275, UG-277, UG-278, UG-286, UG-289, UG-290, and Un-named <br />tunnel 1. <br />Ames began blast drilling of underground workings within Phase Nc at UG-277 and UG-278. Ames <br />blasted underground workings at UG-278 delineated by confirmation drilling on January 23`s at 16:30 <br />and UG-277 on January 25~'. <br />(See Attachment A for approximate construction locations for all Phase N azeas.) <br />Field Monitorine and Testing Activities <br />Golder observed construction activities associated with Phase N earthworks. All construction <br />materials and soil materials were verified as suitable, and construction methods were in accordance <br />with project specifications. Removal of oversized and deleterious material from all fill areas was <br />observed. Golder conducted temperature measurements of fill material prior to placement. No fill <br />was placed until fill temperatures met the requirements of the specifications. <br />Golder observed clearing and grubbing within the Phase IV azea. All available topsoil was removed <br />and deleterious material hauled to Upper Arequa Gulch. <br />Golder observed construction of the 84-inch culvert at the south end of the Permanent Diversion <br />Channel. Golder observed that the material placed (CSP, Pipe Bedding Fill, and Structural Fill) met <br />the requirements of the specifications. Golder observed field testing of the concrete placed for the <br />thrust block. <br />Golder observed placement of SF, SSF, CSB, and CP. 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, and CSB 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 strength results at the completion of 28-day testing. <br />Golder observed and documented excavation and remediation activities associated with the Phase N <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 N <br />construction. Full time monitoring was given to confirmation drilling of underground workings <br />including logging holes, mazking drill locations, surveying holes, and documenting underground <br />workings encountered. <br />PhsaelVe451en13-Ib.doc Golder Associates Inc. <br />