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5. Laboratory Hydraulic Conductivity: Correlate to maximum field hydraulic <br /> conductivity (see Exhibit A) when compacted to a relative compaction of <br /> 90 percent at a water content of 3 to 8 percent greater than the optimum <br /> water content per ASTM D1557, and permeated with water, as measured <br /> using a standard triaxial permeability test method ASTM D5084-90. <br /> 2.5 GRANULAR DRAINAGE MATERIAL <br /> A. Granular Drainage Material (GDM): Clean, washed, well-rounded, hard, durable <br /> sandy gravel free from foreign materials. Material shall have a maximum particle <br /> size of 3/8 inch and shall have less than 3 percent passing the No. 200 sieve. The <br /> minimum hydraulic conductivity to water shall be 0.1 cm/sec. <br /> B. GDM shall contain no limestone or other material that will adversely react with <br /> leachate. <br /> C. The GDM shall be provided by the EARTHWORK CONTRACTOR. <br /> 2.6 COARSE GRAVEL <br /> A. Clean, washed, well-rounded, hard, durable gravel free from dirt, clay clods, roots, <br /> and other foreign materials. Material shall conform to the following washed sieve <br /> gradation as determined by ASTM C117 and C136: <br /> Sieve Size Percent Passing by Weight <br /> 1" 100 <br /> 1/2" 0-15 <br /> No. 4 0-5 <br /> No. 200 0-2 <br /> B. The minimum hydraulic conductivity to water shall be 1.0 cm/sec. <br /> C. Coarse Gravel Material placed directly on geotextile and around HDPE pipe shall <br /> contain no angular particles. <br /> D. Coarse Gravel Material shall contain no limestone or other material that will <br /> adversely react with leachate. <br /> E. The Coarse Gravel shall be provided by the EARTHWORK CONTRACTOR <br /> FORWARD LANDFILL 02300 <br /> 6 EARTHWORK <br />