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L. Operations layer soil overlying the liner system components shall immediately follow the installation of the geomembrane and other geosynthetics overlying the geosynthetic clay liner. If areas cannot be covered immediately due to steepness of slopes, visqueen shall be placed over geosynthetic components overlying the geosynthetic clay liner. The geosynthetic clay liner shall be removed and replaced if it becomes hydrated. M. All hydrated geosynthetic clay liner shall be removed and replaced by the GEOSYNTHETICS CONTRACTOR at no additional cost to the OWNER. Hydrated GCL is defined as material that has become soft as determined by squeezing the material with finger pressure, material that has exhibited swelling, or material that has a moisture content greater than 100 percent as determined by ASTM D2216 or ASTM D4643. Cause for replacement of the GCL due to exposure to moisture and subsequent hydration shall be determined at the QA/QC CONSULTANT's sole discretion. 3.6 SEAMS AND OVERLAPS A. On slopes steeper than 10:1 (horizontal to vertical) all geosynthetic clay liners shall be continuous down the slope; that is, no horizontal seams shall be allowed on the slope. B. No horizontal seams shall be allowed on the base and the crest of the landfill within 5 feet(1.5 m) of the toe or the crest of the slope. C. All geosynthetic clay liners shall be overlapped in accordance with the Manufacturer's recommended procedures. As a minimum, along the length (i.e., the sides) of the mat, the overlap shall be 12 inches. Along the width (i.e., the ends) of the mat,the overlap shall be 12 inches. D. The overlaps shall not be nailed or stapled to the subgrade. E. Granular bentonite shall be placed on the overlaps. 3.7 MATERIALS IN CONTACT WITH THE GEOSYNTHETIC CLAY LINER A. Installation on rough surfaces shall be carefully perfonned to minimize damage to the geosynthetic clay liner. B. Equipment used for placing soils shall not be driven directly on the geosynthetics overlying the geosynthetic clay liner. A minimum thickness of 1 foot of material is required between a low ground pressure dozer (such as a wide pad Caterpillar D-4 bulldozer or equivalent) and the geosynthetic clay liner. A minimum thickness of 3 feet of material is required between rubber-tired vehicles and the geosynthetic clay liner. In areas of heavy vehicle traffic, such as access ramps, the material thickness should be at least 3 feet. The following table shall be complied with during construction: FORWARD LANDFILL 8 02777 GEOSYNTHETIC CLAY LINER(GCL)