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C. All geosynthetic clay liners shall be overlapped in accordance with the <br /> Manufacturer's recommended procedures. As a minimum, along the length (i.e., the <br /> sides) of the mat, the overlap shall be 12 in. Along the width (i.e., the ends) of the <br /> mat,the overlap shall be 12 in. <br /> D. The overlaps shall not be nailed or stapled to the subgrade. <br /> E. Granular bentonite shall be placed on the overlaps. <br /> 3.7 MATERIALS IN CONTACT WITH THE GEOSYNTHETIC CLAY LINER <br /> A. Installation on rough surfaces shall be carefully performed to minimize damage to <br /> the geosynthetic clay liner. <br /> B. Equipment used for placing soils shall not be driven directly on the geosynthetics <br /> overlying the geosynthetic clay liner. A minimum thickness of I ft of material is <br /> required between a low ground pressure dozer (such as a wide pad Caterpillar D-4 <br /> bulldozer or equivalent) and the geosynthetic clay liner. A minimum thickness of <br /> 3 ft of material is required between rubber-tired vehicles and the geosynthetic clay <br /> liner. In areas of heavy vehicle traffic, such as access ramps, the material <br /> thickness should be at least 3 ft. The following table shall be complied with <br /> during construction: <br /> Maximum <br /> Equipment Ground Pressure Initial Lift Thickness <br /> (psi) ft <br /> 5 1.0 <br /> 10 1.5 <br /> 20 2.0 <br /> >20 >3.0 <br /> C. Installation of the geosynthetic clay liner areas with appurtenances areas, and <br /> connection of the geosynthetic clay liner to appurtenances shall be made according <br /> to the Construction Drawings. The GEOSYNTHETICS CONTRACTOR shall <br /> ensure that the geosynthetic clay liner is not damaged while working around the <br /> appurtenances. <br /> 3.8 REPAIR <br /> A. Any holes or tears in the geosynthetic clay liner shall be repaired by placing a <br /> geosynthetic clay liner patch over the hole. On slopes greater than 5 percent, the <br /> patch shall overlap the edges of the hole or tear by a minimum of 2 ft (0.6 m) in all <br /> directions. On slopes 5 percent or flatter, the patch shall overlap the edges of the <br /> hole or tear by a minimum of 1 ft(0.3 m) in all directions. The patch shall be <br /> secured with a water-based adhesive, if approved by the Manufacturer and by the <br /> QA/QC CONSULTANT. <br /> Forward Landfill WMU FU-04 9 GEOSYNTHETIC CLAY LINER (GCL) <br /> 02777 <br />