2011-10-06_REVISION - M1980244 (3)

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3.03 GCL PLACEMENT amee A. GCL rolls should be delivered to the working area of the site in their original packaging. Immediately prior to deployment, the packaging should be carefully removed without damaging the GCL. The orientation of the GCL should be in accordance with the design DRAWINGS, or MANUFACTURER recommendations if not otherwise specified. Packaging waste shall be disposed of daily into landfill or dumpster as designated by OWNER. B. Equipment, which could damage the GCL, shall not be allowed to travel directly on it. If the installation equipment causes rutting of the subgrade, the subgrade must be restored to its originally accepted condition before placement continues. C. Care must be taken to minimize the extent to which the GCL is dragged across the subgrade in order to avoid damage to the bottom surface of the GCL. A temporary geosynthetic subgrade covering commonly known as a slip sheet or rub sheet may be used to reduce friction damage during placement. D. The GCL panels shall be placed parallel to the direction of the slope. E. All GCL panels should lie flat on the underlying surface, with no wrinkles or folds, especially at the exposed edges of the panels. F. Only as much GCL shall be deployed as can be covered at the end of the working day with soil, a geomembrane, or a temporary waterproof tarpaulin. The GCL shall not be left uncovered overnight. If the GCL is hydrated when no confining stress is present, it may be necessary to remove and replace the hydrated material. The GCL supplier should be consulted for specific guidance if premature hydration occurs. G. When a textured geomembrane is installed over the GCL, a temporary geosynthetic covering known as a slip sheet or rub sheet should be used to minimize friction during placement to allow the textured geomembrane to be more easily moved into its final position. H. Although direct vehicular contact with the GCL is to be avoided, lightweight, low ground pressure vehicles such as four -wheel all- terrain vehicles (ATVs) may be used to facilitate the installation of any geosynthetic material placed over the GCL. The GCL MANUFACTURER or CQA Monitor should be contacted with specific recommendations on the appropriate procedures in this situation. L Soil cover, where applicable, shall be placed in a manner that prevents the soil from entering the GCL overlap zones. Cover soil shall be pushed up slopes, not down slopes, to minimize tensile forces on the GCL. 3.04 EARTHWORKS A. Any earthen surface upon which GCL is installed shall be prepared and compacted in accordance with the SPECIFICATIONS and DRAWINGS. The surface shall be smooth, firm, and unyielding, and free of vegetation, construction debris, sticks, sharp rocks, void spaces, ice, abrupt elevation changes, standing water, cracks larger than one - quarter inch (0.25 in) in width, and any foreign matter that could contact the GCL. B. Immediately prior to GCL deployment, the subgrade shall be fmal- graded to fill in all voids or cracks and then smooth- rolled to provide the best practicable surface for the GCL. Prior to smooth- rolling, moisture shall be applied to the surface of the subgrade by a water truck or other means approved by Section 02776.2 Page 5 of 7 September 15, 2011 Geosynthetic Clay Liner (GCL) Revision 0 S: \Projects \1125E CCV COA \H2 - Design \ LOB_ Liner _September2011 \02776.2.r0.doc