2003-02-19_REVISION - M1980244 - Laserfiche WebLink

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Phase IVb Weekly Summary No. 14 Page 2 003-2203 . Ames continued placement of Structural Fill (SF) in the Phase IVb area, placing SF on the Substation Hifl south and west slopes. Ames also continued slope recontouring and re-compaction on Substation Hill and Raven Hill. Ames completed drilling of perforation holes into the 26-inch High Volume Solution Collection System (HVSCS) piping. Ames welded the 14-inch HDPE piping for the Low Volume Solution Collection (LVSCS) riser piping. Ames continued Drain Cover Fill (DCF) removal near the Phase III /Phase Nb PSSA tie-in in prepazation for east end berm and Phase IVb constmction. Ames excavated and constructed approximately 500 feet of Primary Underdrain on the west slope of Substation Hill in the Phase IVb azea. Ames placed Low Volume Solution Collection Fill (LVSCF) onto the previously repaired, tested, and documented aeeas ofpanels L-354, L-355, and L-351, where dozer damage occurred in January 2003. Poly-Flex continued deployment of 100-mil smooth (upper) LLDPE geomembrane in the Phase IVb PSSA. Poly-Flex deployed 100-mil smooth LLDPE geomembrane over an area of approximately 241,224 squaze Feet in the Phase IVb PSSA during this reporting period. Geomembrane panels U-20 through U-114 were deployed, seamed, and pressure tested by Poly-Flex. Destructive fusion seam samples DFu-07 through DFu-35, were marked and removed. Destructive fusion seam peel and shear . tests of samples DFu-O1 through DFu-16 were performed. One destructive sample (DFu-09) failed strength tests, and additional destructive tests were conducted to delineate the affected area. Caps were extrusion welded over the failed seam length, vacuum tested and documented. Phase IVc Ames resumed limited cut to fill activities within the northern limits of the Phase IVc azea. Ames hauled oversize material from the Phase IVc area to an uncontrolled fill site. Ames constructed a geogrid and Select Structural Fill (SSF) cap over working UG-278. Ames placed two layers of geogrid in accordance with the drawings and specifications. Approximately 4,502 square feet of geogrid was placed over the working. Field Monitorin¢ and Testing Activities Golder observed construction activities associated with Phase IV earthworks. All construction materials and soil materials placed 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 observed Structural Fill (SF) placement in Phase IV for materials, lift thickness, moisture content, and compactive effort. Golder observed placement of SLF in Phase IVb for subgrade preparation, thickness, compaction, • moisture content, and earthworks materials used. rmu rvt ia,tor_o-apnb, zrw; Golder Associates lnc.