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<br /> <br />The following table describes the configuration of the Puncture Resistance Test, with materials <br />being listed in order of their placement in the test cell: <br />- minus 2-inch Ironclad tailings (sail liner filq <br />- two approximately 2-inch diameter gravel pieces <br />- 80-mil smooth VLDPE <br />- minus 1-inch liner cover fill <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 and <br />compacted with a compaction hammer to achieve the specified wet density. <br />Additional soil liner fill was placed to achieve a slope on a portion of the soil liner <br />fill to simulate side slope conditions. The material was compacted with a board cut <br />to form an angled end to a density that appeared similar to that achieved in the <br />horizontal lift. <br />- Measurements were made using the top of the mold as a datum to define the slope <br />of the compacted soil liner surface prior to loading. Figure 2 depicts the <br />measurements and location of the measurements taken on the surface of the soil <br />liner. <br />- Two holes were excavated in the surface of the prepared soil liner fill for placement <br />of the two gravel places. One gravel place waa placed In the hole excavated on the <br />sloping soil liner fill and the other gravel piece was planed in the hole excavated on <br />the flatter portion of the soil liner fill. The gravel pieces were placed so that the <br />'flat' face was exposed to the surface similar io the configuration of the rolled soil <br />liner surface on the heap leach pad. Excavated material was placed and compacted <br />as much as possible around the gravel pieces in an attempt to fill the <br />overexcavated hole. <br />- A specimen of the 80-mil VLDPE was cut and placed on the soil finer surface <br />containing the gravel pieces. <br />Approximately a 6-inch lift of liner cover fill was placed over the geomembrane and <br />tamped to simulate a condition that will exist fallowing placement of the liner cover <br />fill on the heap leach pad. <br />The loading plate was placed and leveled on the liner cover fill. The assembly of <br />the loading apparatus was completed. <br />The loads were applied in 100 psi/hour increments until a maximum load of 300 psi <br />was obtained. The load was left on overnight for approximately 16 hours. <br />- Finally, the cell was disassembled, and the VLDPE specimen was examined both <br />visually and employing a modified vacuum box to detect punctures. The vacuum <br />