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<br />May 2005 -5• 053-2386 <br />4.0 TESTING PROGRAM <br />Liner load tests were conducted on the following liner configurations: <br />• Amendment No. 7 and 8 (Phase III and IV) OSA Liner System was tested to a <br />maximum equivalent ore depth of approximately 1,110 feet, reported as Test #1. <br />The OSA Liner System consisted of the following (from top to bottom): <br />0 DCF; <br />0 80 mil LLDPE, single-sided textured geomembrane; and <br />0 SLF. <br />• Amendment No. 8 (Phase IV) PSSA Liner System was tested to a maximum <br />equivalent ore height of approximately 880 feet, reported as Tests 42 and #3.. <br />The PSSA Liner System consisted of the following (from top to bottom): <br />o DCF; <br />0 100 mil LLDPE, smooth geomembrane; and <br />o LVSC Fill. <br />• Amendment No. 6 (Phase I and II) OSA Liner System was tested to a maximum <br />equivalent ore height of approximately 880 feet, reported as Test 44. The OSA <br />Liner System consisted of the following (from top to bottom): <br />o DCF; <br />0 80 mil VLDPE, single-sided textured geomemb-ane; and <br />0 SLF. <br />4.1 Test #1- Phases III and IV OSA Liner System <br />The test sample was assembled using approximately four inches of SLF in the bottom of the cell, <br />compacted to a target density of 95 percent of the maximum standard Proctor dry density at plus or <br />minus two percent of the optimum moisture content. The maximum standard Proctor density for the <br />soil is 114.6 pounds per cubic foot (pcf) with optimum moisture content of 13.1 percent. The SLF <br />was compacted to a dry density of 96.6 percent at a moisture content of 12.0 percent. Next, a 12-inch <br />diameter piece of 80-mil single-sided textured LLDPE geomembrane was placed on top of the SLF <br />material, textured side down. Finally, the DCF material was placed in four lifts on top of the liner to <br />a thickness of approximately 9.4 inches. The thickness of SLF and DCF placed in the load cell is not <br />representative of field conditions, but does provide "worst case" loading as the thin DCF layer will <br />X77 <br />avstobott?.ea Golder Associates