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<br />performance testing is to determine if any mechanical damage will occur to the geomembrane <br />when subjected to maximum static heap loading conditions. <br />Sample Preparation: <br />Samples were placed in the cell in a condition representing placement on the pad. Soil liner fill <br />was near optimum moisture content and was compacted to a wet density of approximately 141 <br />pounds per cubic foot. That value is consistent with field measurements of soil liner fill recently <br />obtained during construction. The sample of soil liner fill was obtained from the heap leach pad <br />after the fill had been dumped from a truck and prior to compaction. The sample generally <br />contained material that was less than 3/4-inch in size, but consistent with the material being <br />placed on the pad, was reconstituted to contain gravel pieces about 2-inches in size. The gravel <br />pieces were obtained from material that was considered to be "reject" material from the surface <br />of the soil liner fill during the site inspection on August 29, 1994. <br />A sample of the drain cover fill was obtained directly from Heap Leach Pad No. 2. The <br />material contained material less than 1-inch and was generally well graded to the sand fraction. <br />The geomembrane sample was obtained from a roll of smooth 80-mil VLDPE that had been <br />delivered to the project site from which a 10-inch diameter test specimen was cut. <br />Test Configuration: <br />The following list depicts the configuration of the Puncture Resistance Test, with materials listed <br />in order of their placement in the test cell from top to bottom: <br />- minus 1-inch liner cover fill <br />- SO-mil smooth VLDPE <br />- two approximately 2-inch diameter gravel pieces (imbedded in soil liner surface) <br />- minus 2-inch Ironclad tailings (soil liner) <br />A schematic diagram of the test configuration is included as Figure 1. <br />Procedure: <br />The following test procedure was followed to perform the Puncture Resistance Test: <br />- A loose lift of soil liner fill was placed in a horizontal lift in the test apparatus <br />and compacted with a compaction hammer to achieve the specified wet density. <br />- Additional soil liner till was placed to achieve a slope on a portion of the soil <br />liner fill to simulate side slope conditions. The material was compacted, with a <br />board cut to form an angle, to a density that appeared similar to that achieved in <br />the horizontal lift. <br />2 <br />