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6.4 Sufficient anchorage may alternately be obtained by extending the end of the GCL roll back from the <br />crest of the slope, and placing cover soil. The length of this "runout" anchor should be prepared in <br />accordance with project drawings and specifications. <br />SEAMING <br />7.1 GCL seams are constructed by overlapping adjacent panel edges and ends. Care should be taken to <br />ensure that the overlap zone is not contaminated with loose soil or other debris. Supplemental <br />bentonite is not required for Claymax 200R. Bentomat ST, DN, SDN, or YSDN with Supergroove~ <br />have self-seaming capabilities in their longitudinal overlaps (Figure 10) without the need for <br />supplemental bentonite. For pond applications, CETCO supplemental bentonite must be used in <br />longitudinal seams regardless of the CETCO GCL used. <br />SUPERGROOVE ' <br />7.2 Longitudinal seams should be overlapped a minimum of 6 inches (150mm) for Bentomat and 12 <br />inches (300mm) for Claymax. <br />7.3 End-of-panel overlapped seams should be overlapped 24 inches (600mm) for Bentomat and <br />48 inches (1,200mm) for Claymax. <br />7.4 End-of-panel overlapped seams are constructed such that they are shingled in the direction of <br />the grade to prevent runoff from entering the overlap zone. End-of-panel seams on slopes are <br />permissible, provided adequate slope stability analysis has been conducted (i.e., the GCL is <br />not expected to be in tension). Bentonite-enhanced seams are required for all Bentomat <br />end-of-panel overlapped seams. <br />~ 10 of 15 <br />BENTOMAT/CLAYMAX Installation Guidelines <br />6.3 The GCL should be placed in the anchor trench such that it covers the entire trench floor but does ~ ~i <br />not extend up the rear trench wall. <br />