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Phase IVa Weekly Summary No. 56 Page 2 003-2203 dozer rip the azea and mix the SLF with the subgrade, and then replace the SLF for this azea. SLF replacement was not scheduled until the week of July IS` Ames started night shift for SLF placement on June 22"d. The night shift was discontinued on June 25a'. Ames continued placement of Drain Cover Fill (DCF) and haul road construction in the Phase Na area. The DCF was placed using CAT D6, D8, and D9 dozers. The DCF was placed on the floor and slopes, advancing from north to south. Ames continued construction of the Leak Detection Trench (LDT) in the southern end of Phase Na. A CAT 426, 120 (wl a hammer attachment), 330 excavator, and a Vermeer trencher were being used for the LDT construction. Ames began construction of the three (3) 42" CSP's for the VLF access road on June 27a'. The CSP's were placed and pipe backfilling began on June 28a' and completed on June 29u'. Poly-Flex continued deployment of 80-mil LLDPE geomembrane in the Phase IVa area. Poly-Flex deployed 80-mil single-sided textured LLDPE geomembrane over an area of 132,061 squaze feet in the Phase IVa azea during this reporting period. Geomembrane panels P136 through P161 were deployed, seamed, and tested by Poly-Flex. Destructive seam samples DF-53 through DF-66 were marked, removed, and tested. Ames did not perform confirmation drilling in the Phase IVa area during this reporting period. Phase IVb ~ Ames continued constmction of the Phase IVb(c Temporary Diversion Channel and completed construction on June 27`h. During this reporting period, the 36" CSP headwall and wing-walls were formed and poured. Channel forming and final grading were also conducted. Rip-rap was placed upstream of the headwall. Backfil] was placed behind the CSP headwall. Ames resumed placement of Structural Fill (SF) in the Phase Nb area by reconstructing the saddle berm removed for 36"CSP placement. Ames began removal of the old diversion channel. This work consisted of removal of the concrete headwall and CSP's underneath the old Highway 67 alignment, removal of channel rip-rap, and demolition and removal of a concrete drop-structure. Ames began removal of topsoil from the northwest face of the substation hill area. Uncontrolled fill materials was placed by Ames adjacent to the Secondary Crusher fill. Ames continued removal of DCF from the Phase III liner near Chicken Hawk Hill. Ames performed excavation remediation activities for underground working UNK-11. The working was observed and verified to be "Deep" as defined in the drawings and will be remediated accordingly. vn~<,v. sa m,K szv.eoc Golder Associates Inc.