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INSTALLATION GUIDELINES <br />BENTOMAT® <br />GEOSYNTHETIC CLAY LINERS <br />In many instances, a needlepunch reinforced GCL may <br />require removal /replacement if the following are true: <br />• The geotextiles have not been separated, torn, or <br />otherwise damaged <br />• There is no evidence that the needlepunching between <br />the two geotextiles has been compromised <br />• The GCL does not leave deep indentations when <br />stepped upon <br />• Overlapped seams with bentonite enhancement (see <br />Section 7) are intact <br />5.9 <br />For the convenience of the installer, hash marks are placed on <br />BENTOMAT goesynthetic clay liners every 5' (1.5 m) of length. <br />Compacted Soil Backfill <br />SECTION 6 <br />ANCHORAGE <br />6.1 <br />If required by the project drawings, the end of the GCL roll should <br />be placed in an anchor trench at the top of a slope. The front <br />edge of the trench should be rounded to eliminate any sharp <br />corners that could cause excessive stress on the GCL. Loose <br />soil should be removed or compacted into the floor of the trench. <br />FIGURE 9 - TYPICAL ANCHOR TRENCH DESIGN <br />E <br />E <br />18" (450 mm) <br />Compacted Subgrade <br />2870 Forbs Avenue Hoffman Estates, IL 60192 <br />847.851.1800 1 800.527.9948 <br />- 8 - <br />(T <br />not <br />Rounded Corner <br />Varies <br />TT Z nnTTTT "Tf7TTTT ^,7''V 1 ' Z(.'!G[.f <br />6.2 <br />If a trench is used for anchoring the end of the GCL. soil backfill <br />should be placed in the trench to provide resistance against <br />pullout. The size and shape of the trench, as well as the <br />appropriate backfill procedures should be in accordance with <br />the project drawings and specifications. Typical dimensions are <br />shown in Figure 9. <br />6.3 <br />The GCL should be placed in the anchor trench such that it <br />covers the entire trench floor but does not extend up the rear <br />trench wall. <br />6.4 <br />Sufficient anchorage may alternately be obtained by extending <br />the end of the GCL roll back from the crest of the slope, and <br />placing cover soil. The length of this "runout" anchor should be <br />prepared in accordance with project drawings and specifications. <br />SECTION 7 <br />SEAMING <br />7.1 <br />GCL seams are constructed by overlapping adjacent panel edges <br />and ends. Care should be taken to ensure that the overlap zone <br />is not contaminated with loose soil or other debris. BENTOMAT <br />200R, BENTOMAT ST, BENTOMAT DN, and BENTOMATSDN have <br />SUPERGROOVE which provides self- seaming capabilities in their <br />longitudinal overlaps, and therefore do not require supplemental <br />bentonite. However, for pond applications, supplemental <br />bentonite must be used in longitudinal seams, regardless of the <br />CETCO GCL. <br />GCL <br />