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Phase IV Weekly Summary No. 46 Page 3 003-2203 UNK-9. Ames blasted underground workings delineated b~ confirmation drilling at UG-286 on January 29a' at 16:30 and at UG-269 and UNK-9 on Febmary 6 at 16:30. i (See Attachment A for approximate construction locations for all Phase IV azeas.) Field Monitoring and Testing Activities Golder observed construction activities associated with Phase IV earthworks. All construction materials and soil materials 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 conducted temperature measurements of fill material prior to placement. No fill was placed until fill temperatures met the requirements of the specifications. Golder observed cleazing and grubbing within the Phase )V area. All available topsoil was removed and deleterious material hauled to Upper Arequa Gulch. Golder observed construction of the 84-inch culvert at the south end of the Permanent Diversion Channel. Golder observed that the material placed (CSP, Pipe Bedding Fill, and Structural Fill) met the requirements of the specifications. Golder observed placement of SF, SSF, and CSB. These materials were placed in accordance with the drawings and specifications into excavated or open underground workings. Golder previously obtained samples of SF, SSF, and CSB for laboratory testing. Materials supplied met specifications. Ground Engineering conducted field testing and sampling of CP concrete as per specifications, and • will supply strength results at the completion of 28-day testing. Golder observed and documented excavation and remediation activities associated with the Phase N underground working construction. Full time monitoring was given to excavation of underground workings. Golder observed and documented confirmation drilling activities associated with the Phase IV construction. Full time monitoring was given to confirmation drilling of underground workings including logging holes, mazking drill locations, surveying holes, and documenting underground workings encountered. Laboratory Test Results Golder obtained QA samples SFa-09 and SFb-04 of Structural Fill being placed in Phase IVa and Phase IVb. Test results will be presented upon completion of laboratory testing. Golder conducted conformance sampling and testing of Tensaz UX1700HS geogrid delivered to site. All lots sampled met project specifications and results are presented in Attachment B. Golder began to conduct Conformance Testing of geomembrane being produced by POLYFLEX. Test results on material produced to date indicate passing values with the exception of 80-mil LLDPE role number PR-8-O1-0019-37 that failed to meet the minimum and average thickness s Phase Ne 46 Jv2]-Feb9.doc Golder Associates Inc.