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<br />San Luu Project - Pheae 11 Rain 1 8zpanaion ConaWCtion States Report <br />4.4.4 Random Fill <br />Material Type 4 is being used as random fill for general grading and backfilling localized <br />' depressions as well as for construction of the north and east dikes. Type 4 material utilized as <br />fill is placed in 12-inch maximum loose lifts within two percent of optimum moisture content <br />and compacted to 95 percent of maximum dry density (ASTM D-698). Type 4 material is also <br />utilized to construct liner cover/drain layer placement access roads. For this use, approximately <br />2-3 ft. of Type 4 material is placed over the liner cover layer to provide equipment access to <br />other areas. <br />4.5 Liner <br />' 4.5.1 Phase 1-2 Liner Tie-In <br />In order to create a continuous liner sub-based layer/clay liner layer beneath Ghe geomembrane <br />at the Phase 1 to Phase 2 de-in, the Phase 1 liner is cut at the anchor trench and laid back. The <br />liner within the anchor trench is then removed and Phase 2 sub-base is placed directly adjacent <br />' to the Phase 1 sub-base with no intervening synthetic liner. Detail of this ruin configuration <br />is depicted on Figure 2. <br />' 4.5.2 Pipeline Underliner <br />' In order to preclude the possibility that erosion of the liner cover layer beneath the tailings <br />distribution and water return pipelines could result in the pipeline(s) resting directly on the 40- <br />mil. VLDPE liner, a piece of 60-mil. HDPE liner is placed on top of the VLDPE liner beneath <br />the pipelines and liner cover layer. A full roll width, 22 ft, piece of HDP'E liner is being <br />utilized. This liner is not welded to the primary VLDPE liner. <br />' 4.5.3 Conformance Samples <br />The Owner has elected to sample the geosynthetic liner for third-party conformance testing to <br />verify that the actual material properties conform to the specifications of the Grier required to <br />be provided by the manufacturer. A 3 ft x 5 ft sample is collected from every 1Q0,000 ft= of <br />' liner delivered. These samples are sent to Precision Laboratories of Orange, California for <br />testing. <br />' October, 199J 9 SRK Project No. 14725 <br />