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' Phase IVb Weekly Summary No. 16 Pale 3 003-2203 <br />approximately 42,304 square feet in the Phase IVb OSA during this reporting period. Geomembrane <br />panels P-603 through P-6li were deployed, seamed, and pressure tested by Poly-Flex. Destructive <br />fusion seam samples DF-164 through DF-168 and extrusion seam sample DX-29 were marked and <br />removed. Destructive fusion and extrusion seam peel and sheaz tests of DF-164 through DF-168 and <br />DX-29 were performed and passed per project specifications. <br />Phase IVc <br />Ames resumed limited cut to fill and cut to temporary stockpiling activities within the limits of the <br />Phase 1Vc area. Ames hauled Structural Fill (SF) material from the Phase IVc azea to temporary <br />stockpiles on Chicken Hawk Hill and in the Saddle Fill. <br />Field Monitoring and Testing Activities <br />Golder observed construction activities associated with Phase N 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 or deleterious material from all fill <br />azeas was observed. Golder observed Structural Fill (SF) placement in Phase IV for materials, lift <br />thickness, moisture content, and compactive effort. <br />Golder observed placement, compaction, and conditioning of LVSCF in the Phase IVb PSSA sump <br />for subgrade preparation of the High Volume Solution Collection System (HVSCS) riser <br />foundations. Golder CQA monitors performed four nuclear moisture-density tests (LVSCNb-O1 <br />through LVSCNb-04) on LVSCF placed within the Phase IVb PSSA sump. The tests performed met <br />the requirements of the specifications and the nuclear moisture-density results summary is presented <br />in Attachment B. <br />Golder visually observed the placement of LVSCF in the Phase Nb PSSA area. Golder CQA <br />monitors (one monitor per dozer when dozers are greater than 50 ft apart) observed LVSCF <br />placement. <br />Golder observed anchor trench excavation in the Phase IVb PSSA and OSA for proper location and <br />dimension (2' wide by 3' deep). Anchor trench excavation met or exceeded the requirements of the <br />specifications. Golder observed anchor trench backfill in the Phase IVb PSSA for lift thickness and <br />compaction. <br />Golder observed construction of the Primary Underdrain in Phase IVb for trench dimension (5' wide <br />by 3' deep), slope (minimum 1%), materials, and geotextile overlap. <br />Golder observed and monitored placement of Bedding Fill (BF) in the Phase IVb PSSA for proper <br />location and thickness (1' deep). Golder monitored compactive effort and fmish grading to verify <br />conditions met specification. <br />Golder observed geomembrane deployment, documenting ambient air temperature, panel <br />dimensions, thickness, seaming, tie-in overlap, and seam testing (trial seams, pressure, vacuum, and <br />destructive). Geomembrane placed in the Phase IVb area met the project specifications. <br />Phaze N616 Mayo-May10, 200i.doc Golder Associates lnc. <br />