ARCHIVED REPORTS_1989 - Laserfiche WebLink

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E, • Compaction curve - one representative sample of material • Moisture content - one representative sample of material Sieve analysis - one representative sample of material • Hydraulic Conductivity (permeability) - representative samples of material, compacted to a relative compaction of 90 percent of the maximum dry density at selected moisture contents. The number of samples tested and the moisture contents will be determined before testing, depending on the characteristics of the soil to be tested. During construction, the following construction and quality control program will be observed to build a high-quality clay liner. 1. An area of the base is excavated to 1 foot below top -of -liner grade. 2. The 1 -foot overexcavation is then filled to top -of -liner grade with tested and approved clayey or silty soil with a permeability of 1 x 10-6 cm/sec or less, when compacted. The low -permeability soils are compacted in 8 -inch (maximum) lifts to 90 percent relative compaction (ASTM Test Designation D 1557-78). Before compaction, the soil is moisture -conditioned to bring it as close as practical to a moisture content which produces lowest perme- ability. Compliance with these base preparation procedures should result in a base with a permeability of 1 x 10-6 cm/sec or less. 5.6.4 Dendritive Network of Perforated Pipes A dendritive network of perforated pipes will be installed above the liner on the landfill base. Perforated pipe will be installed inside the drainage material within and normal to the drainage swales. Any excess liquid in the refuse fill will flow through the drainage material to the perforated pipes, which will serve as conduits to the perimeter sumps. The pipes normal to the swales will be spaced to intercept liquid in the refuse fill and prevent mounding of liquid on the base clay liner. PJ9 9390218A.00W 48 Rev. 0 July 20, 1989