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Phase IV Weekly Summary No. 48 Page 3 <br />003-2203 <br />Ames performed confirmatory drilling activities associated with the Phase IVc construction area on <br />known underground workings UG-257, UG-261, and UG-495. <br />Ames continued placement of Select Structural Fill (SSF) into "Shallow" underground workings UG- <br />290, UG-290b, UG-293, and UG-261. <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 March Su' at 16:30. <br />Ames began placement of Cemented Rockfill (CR) at UG-242 by tapering the working, and placing 7 <br />feet of CR in accordance with IFC Drawing 12, Detail 1. <br />(See Attachment A for approximate construction locations for atl Phase IV azeas.} <br />Field Monitoring and Testing 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 />azeas 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 placement of SF, SSF, and CR. These materials were placed in accordance with <br />• the drawings and specifications into excavated or open underground workings. Golder previously <br />obtained samples of SF, SSF, and CR for laboratory testing. Materials supplied met specifications. <br />Ground Engineering conducted field testing and sampling of CP concrete as per specifications, and <br />supplied passing 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 co~rmation drilling activities associated wish the Phase IV <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 />Golder observed and tested placement of SLF at the LOB completing two in-situ density tests, three <br />depth verification tests, and verifying surface preparation. Soil Liner fill was placed in accordance <br />to the specification. Golder observed deployment of geomembrane documenting ambient air <br />temperature, panel dimensions, seaming, tie-in overlap, seam testing (trial seams, pressure, vacuum, <br />and destructive) and conducted the final walk-through. Geomembrane placed at the LOB met <br />specifications. Golder provided full time observation of DCF placement over the deployed LLDPE. <br />Golder verified DCF placement for material, placement technique, wrinkles, and thickness. DCF <br />placed met specifications. <br />ew~rva ae e~bza-hlarcre.doo Golder Associates Inc. <br />