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d s <br /> bentonite is required for this overlap. If the GCL does not have a grooved cut in the <br /> nonwoven geotextile longitudinal overlap, then bentonite-enhanced seams are required <br /> as described below. <br /> C. End-of-roll overlapped seams should be constructed with a minimum overlap of 24 <br /> inches (600 mm) for Bentomat ST. Seams at the ends of the panels should be <br /> constructed such that they are shingled in the direction of the grade to prevent the <br /> potential for runoff flow to enter the overlap zone. End-of-roll overlapped seams require <br /> bentonite-enhanced seams as described below. <br /> D. Bentonite-enhanced seams are constructed between the overlapping adjacent panels as <br /> follows. The underlying edge of the longitudinal overlap is exposed and then a <br /> continuous bead of granular sodium bentonite is applied along a zone defined by the <br /> edge of the underlying panel and the 6-inch (150-mm) line. The granular bentonite shall <br /> be applied at a minimum application rate of one quarter pound per lineal foot (0.4 kg/m). <br /> A similar bead of granular sodium bentonite is applied at the end-of-roll overlap. <br /> E. Cyclical wetting and drying of GCL covered only with geomembrane can cause overlap <br /> separation. Soil cover should be placed promptly whenever possible. Geomembranes <br /> should be covered with a white geotextile and/or operations layer without delay to <br /> minimize the intensity of wet-dry cycling. If there is the potential for unconfined cyclic <br /> wetting and drying over an extended period of time, the longitudinal seam overlaps <br /> should be increased based on the project engineer's recommendations. <br /> F. To avoid seam separation, the GCL should not be put in excessive tension by the weight <br /> or expansion of textured geomembrane on steep slopes. The project Engineer should <br /> be consulted about the potential for GCL tension to develop. <br /> 3.7 Detail Work <br /> A. The GCL shall be sealed around penetrations and embedded structures embedded in <br /> accordance with the design drawings and the GCL Manufacturer. <br /> B. Cutting the GCL should be performed using a sharp utility knife. Frequent blade <br /> changes are recommended to avoid damage to the geotextile components of the GCL <br /> during the cutting process. <br /> 3.8 Damage Repair <br /> A. If the GCL is damaged (torn, punctured, perforated, etc.) during installation, it may be <br /> possible to repair it by cutting a patch to fit over the damaged area. The patch shall be <br /> obtained from a new GCL roll and shall be cut to size such that a minimum overlap of 12 <br /> inches (300 mm) is achieved around all of the damaged area. Granular bentonite or <br /> bentonite mastic should be applied around the damaged area prior to placement of the <br /> patch. It may be desirable to use an adhesive to affix the patch in place so that it is not <br /> displaced during cover placement. <br /> 2870,Forbs Avenue Hoffman Estates, {L 601.92 CEV2�'J <br /> 847.851.1800 1 800.527.9948 <br /> www.CETCO.com <br />