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u <br />J <br />0 <br />1-1 <br />r <br />11 <br />C <br />u <br />0 <br />0 <br />L' <br />C <br />r <br />During construction the following construction and quality control program will be <br />observed to build a high-quality clay liner. <br />1. An area of the base is excavated to 1 foot below top -of -liner grade. <br />2. The 1 -foot overexcavation is then filled to top -of -liner grade with tested and <br />approved clayey or silty soil with a permeability of 1 x 10-6 cm/sec or less, <br />when compacted. The low -permeability soils are compacted in 8 -inch <br />(maximum) lifts to 90 percent relative compaction (ASTM Test Designa- <br />tion D 1557-78). Before compaction, the soil is moisture -conditioned to <br />bring is as close as practical to a moisture content which produces lowest <br />permeability. <br />Compliance with these base preparation procedures should result in a base with <br />a permeability of 1 x 10-6 cm/sec or less. <br />10.1.2 Dendritive Network of Perforated Pipes <br />A dendritive network of perforated pipes will be installed above the liner on the <br />landfill base. Perforated pipe will be installed in the drainage material within and <br />normal to the drainage swales. Any excess liquid in the refuse fill will flow <br />through the drainage material to the perforated pipes, which will serve as con- <br />duits to the perimeter sumps. The pipes normal to the swales will be spread to <br />intercept liquid in the refuse fill and prevent mounding of liquid on the base clay <br />liner. <br />PJ9 9390219A.00W <br />IM <br />Rev. 0 July 19, 1989 <br />