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3.03 GCL PLACEMENT <br />amec'P <br />A. GCL rolls should be delivered to the working area of the site in their original packaging. <br />Immediately prior to deployment, the packaging should be carefully removed without damaging the <br />GCL. The orientation of the GCL should be in accordance with the design DRAWINGS, or <br />MANUFACTURER recommendations if not otherwise specified. Packaging waste shall be disposed <br />of daily into landfill or dumpster as designated by OWNER. <br />B. Equipment, which could damage the GCL, shall not be allowed to travel directly on it. If the <br />installation equipment causes rutting of the subgrade, the subgrade must be restored to its originally <br />accepted condition before placement continues. <br />C. Care must be taken to minimize the extent to which the GCL is dragged across the subgrade in order <br />to avoid damage to the bottom surface of the GCL. A temporary geosynthetic subgrade covering <br />commonly known as a slip sheet or rub sheet may be used to reduce friction damage during <br />placement. <br />D. The GCL panels shall be placed parallel to the direction of the slope. <br />E. All GCL panels should lie flat on the underlying surface, with no wrinkles or folds, especially at the <br />exposed edges of the panels. <br />F. Only as much GCL shall be deployed as can be covered at the end of the working day with soil, a <br />geomembrane, or a temporary waterproof tarpaulin. The GCL shall not be left uncovered overnight. <br />If the GCL is hydrated when no confining stress is present, it may be necessary to remove and <br />replace the hydrated material. The GCL supplier should be consulted for specific guidance if <br />premature hydration occurs. <br />G. When a textured geomembrane is installed over the GCL, a temporary geosynthetic covering known <br />as a slip sheet or rub sheet should be used to minimize friction during placement to allow the textured <br />geomembrane to be more easily moved into its final position. <br />H. Although direct vehicular contact with the GCL is to be avoided, lightweight, low ground pressure <br />vehicles such as four -wheel all- terrain vehicles (ATVs) may be used to facilitate the installation of <br />any geosynthetic material placed over the GCL. The GCL MANUFACTURER or CQA Monitor <br />should be contacted with specific recommendations on the appropriate procedures in this situation. <br />I. Soil cover, where applicable, shall be placed in a manner that prevents the soil from entering the <br />GCL overlap zones. Cover soil shall be pushed up slopes, not down slopes, to minimize tensile <br />forces on the GCL. <br />3.04 EARTHWORKS <br />A. Any earthen surface upon which GCL is installed shall be prepared and compacted in accordance <br />with the SPECIFICATIONS and DRAWINGS. The surface shall be smooth, firm, and unyielding, <br />and free of vegetation, construction debris, sticks, sharp rocks, void spaces, ice, abrupt elevation <br />changes, standing water, cracks larger than one - quarter inch (0.25 in) in width, and any foreign <br />matter that could contact the GCL. <br />B. Immediately prior to GCL deployment, the subgrade shall be final - graded to fill in all voids or cracks <br />and then smooth - rolled to provide the best practicable surface for the GCL. Prior to smooth - rolling, <br />moisture shall be applied to the surface of the subgrade by a water truck or other means approved by <br />Section 02776.1 Page 5 of 7 <br />Geosynthetic Clay Liner (GCL) <br />June 19, 2012 <br />Revision 1 <br />