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FIGURE 10 - SUPERGROOVE <br />7.2 <br />Longitudinal seams should be overlapped a minimum of 6 <br />inches (150 mm) for BENTOMAT geosynthetic clay liners. For <br />high -head applications (greater than 1 foot or 20.48 cm) <br />involving BENTOMAT CL, BENTOMAT CLT, or BENTOMAT 600 CL, <br />a minimum longitudinal seam overlap of 12 inches (300 mm) <br />and supplemental bentonite (per Section 7.6) is recommended. <br />7.3 <br />End -of -panel overlapped seams should be overlapped 24 inches <br />(600 mm) for BENTOMAT geosynthetic clay liners. <br />7.4 <br />End -of -panel overlapped seams are constructed such that they <br />are shingled in the direction of the grade to prevent runoff from <br />entering the overlap zone. End -of -panel seams on slopes are <br />permissible, provided adequate slope stability analysis has <br />been conducted (Le., the GCL is not expected to be in tension). <br />Bentonite- enhanced seams are required for all BENTOMAT end - <br />of -panel overlapped seams. <br />7.5 <br />BENTOMAT end -of- panel, bentonite- enhanced, overlapped <br />seams are constructed first by overlapping the adjacent panels, <br />exposing the underlying panel, and then applying a continuous <br />bead or fillet of granular sodium bentonite 12" from the edge of <br />the underlying panel (Figure 11). The minimum application rate <br />at which the bentonite is applied is one - quarter pound per linear <br />foot (0.4 kg/m). <br />7.6 <br />If longitudinal bentonite enhanced seams are required for <br />BENTOMAT 200R, BENTOMAT ST, BENTOMAT DN, or BENTOMAT <br />SDN, they are constructed by overlapping the adjacent panels a <br />minimum 6 inches (150 mm), exposing the underlying edge, and <br />applying a continuous bead of granular bentonite approximately <br />3 inches (75 mm) from the edge. For pond applications involving <br />BENTOMAT CL or BENTOMAT CLT, longitudinal seams are <br />constructed by overlapping adjacent panels by 12 inches (300 <br />mm), exposing the underlying edge, and applying a continuous <br />bead of bentonite approximately 6 inches (150 mm) from the <br />edge. The minimum application rate for the granular bentonite <br />is one quarter pound per linear foot (0.4 kg/m). <br />FIGURE 11 <br />BENTOMAT END -OF -PANEL OVERLAPPED SEAM <br />SECTION 8 <br />SEALING AROUND PENETRATIONS <br />AND STRUCTURES <br />8.1 <br />Cutting the GCL should be performed using a sharp utility knife. <br />Frequent blade changes are recommended to avoid irregular <br />tearing of the geotextile components of the GCL during the <br />cutting process. <br />8.2 <br />The GCL should be sealed around penetrations and structures <br />embedded in the subgrade in accordance with Figures <br />12 through 14. Granular bentonite shall be used liberally <br />(approximately 0.25 Ibs /In. ft. or 0.4 kg/m) to seal the GCL to <br />these structures. <br />cE, <br />www.CETCO.com <br />