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amec <br />Earth & Environmental <br />The installed and existing geomembrane at the Phase IVa re-certification area was inspected by <br />CC&V, Ames, Lonestar, and AMEC representatives. The geomembrane was found to be <br />acceptable for drain cover fill placement. <br />C) Phase IVc Re-certification Geomembrane Installation <br />Geomembrane deployment at the Phase IVc re-certification was performed replacing the existing <br />geomembrane designated in the Re-certification Memo. The subgrade surface was inspected and <br />found to be acceptable prior to each panel deployment. Density, permeability, moisture, and depth <br />testing was performed previously in the area (11/3/2009). Six panels of 100 mil single sided <br />textured geomembrane were deployed for an approximate total square footage of 3,096. Two <br />fusion trial seams were performed during the deployment of geomembrane with passing results. <br />Nineteen seams were fusion welded for an approximate total of 409 linear feet. Two destructive <br />test samples were marked during fusion seaming and tested with passing results. Twenty three <br />seam pressure tests were performed with passing results. Twenty nine repairs were made using the <br />extrusion welding method. Three extrusion trail welds were performed during repair activities with <br />passing results. Vacuum testing of all repairs was performed with passing results. AMEC <br />representatives were present at all times during geomembrane installation activities. <br />The installed and existing geomembrane at the Phase IVc re-certification area was inspected by <br />CC&V, Ames, Lonestar, and AMEC representatives. The geomembrane was found to be <br />acceptable for drain cover fill placement. <br />VII) VLF Drain Cover Fill <br />A) Phase IVa Geomembrane Re-certification Area <br />Drain cover fill placement was performed over the accepted area of geomembrane at the Phase IVc <br />re-certification. Drain cover fill was hauled from the stockpile just east of the old substation site <br />using two 40-ton articulating haul trucks loaded by a CAT 375 excavator. The drain cover fill was <br />placed using a CAT 330 excavator to cast the material over the liner. Drain cover fill placement <br />was also performed using a CAT D-6 LGP (low ground pressure) dozer when access to the area <br />was established. A minimum if 2 feet of cover was placed over the geomembrane. An AMEC <br />representative observed the placement constantly. <br />B) Phase IVc Geomembrane Re-certification Area <br />Drain cover fill placement was performed over the accepted area of geomembrane at the Phase IVc <br />re-certification. Drain cover fill was hauled from the stockpile just east of the old substation site <br />using two 40-ton articulating haul trucks loaded by a CAT 375 excavator. The drain cover fill was <br />placed using a CAT 330 excavator to cast the material over the liner. A minimum if 2 feet of cover <br />was placed over the geomembrane. This placement was performed to support the slope to the <br />north, allowing the removal of the support buttress to west. Drain cover fill was placed only on the <br />eastern portion of the re-certification area. An AMEC representative observed the placement <br />constantly. <br />VLF Weekly Report WE 11.14.09.D.doc