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Phase IVb Weekly Summary No. 18 Page 3 003-2203 <br />. Substitution of 100-mil singled-sided textured liner for 100-mil double-sided textured on the upper floor <br />of the PSSA sump was allowed by the Certifying Engineer, provided the textured side is placed facing <br />upwazd. The upwazd facing textured surface is needed to provide frictional resistance for the Drain <br />Cover Fill and Risers. <br />Poly-flex deployed 100-mil single-sided textured LLDPE geomembrane over an azea of approximately <br />11,930 square feet in the Phase IVb PSSA sump floor during this reporting period. Geomembrane <br />panels U-361, U-363, U-368 through U-380, and U-398 through U-400 were deployed, seamed, and <br />pressure tested by Poly-Flex. Destructive fusion seam sample DFu-114, and extrusion seam samples <br />DXu-07 through DXu-08 were marked and removed. Destructive fusion and extrusion seam peel and <br />shear tests of these samples were performed and passed per project specification. <br />Phase IVc <br />Ames performed no construction activities in the Phase IVc area during this reporting period. <br />Field Monitorine and Testine 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 or deleterious material from all fill <br />azeas was observed. Golder observed SF placement in Phase IV for materials, lift thickness, <br />moisture content, and compactive effort. <br />• Golder observed dewatering and re-compaction of LVSCF in the Phase IVb PSSA sump after <br />rainfall flooded the area. Golder CQA monitors performed four nuclear moisture-density re-tests <br />(LVSCNb-Olb through LVSCNb-046) on LVSCF within the Phase IVb PSSA sump. The tests <br />performed met the requirements of the specifications and the nuclear moisture-density results <br />summary is presented in Attachment B. <br />Golder visually observed the placement and grading of LVSCF in the Phase IVb PSSA area. Golder <br />CQA monitors (one monitor per dozer when dozers are greater than 50 ft apart) observed LVSCF <br />placement and verified minimum thickness of 3 feet. <br />Golder visually observed the placement of DCF in the Phase IVb PSSA area. Golder CQA monitors <br />(one monitor per dozer when dozers are greater than 50 ft apart) observed DCF placement and <br />verified minimum thickness of 2 feet for finish grade, 4 feet for HVSCS primary pipe locations, and <br />10 feet for haul road construction. <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 and monitored placement of BF in the Phase IVb PSSA for proper location and <br />• thickness (1' deep). Golder monitored compactive effort and finish grading to verify conditions met <br />specifications. <br />Phase IVb lBMay18-htay2i ?OW(q.doc Golder Associates lnc. <br />