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• <br />ameO <br />2.8 2010 OSA Composite Liner System <br />The 2010 OSA is a primary composite liner as follows: <br />• The primary composite liner system in the 2010 Phase 5 OSA consists of <br />a minimum of 12 inches of compacted SLF overlain by a layer of 80-mil <br />single-sided textured LLDPE geomembrane (textured side down). <br />• The HVSCS is installed over the primary liner. The HVSCS consists of <br />HVSCS piping and DCF (minimum of 2 feet). <br />0 <br />The installation of the primary layer of geomembrane in the 2010 Phase 5 OSA began in <br />May 2010 and was completed in October 2010. Lone Star installed approximately 190,467 <br />(neat line) square feet of 80-mil smooth LLDPE (texture face down) LLDPE geomembrane. <br />2.9 PSSA Composite Liner System <br />The PSSA is a double geomembrane lined system with a secondary composite liner and a <br />primary geomembrane layer separated by a Low Volume Solution Collection System <br />(LVSCS), as follows: <br />• The secondary composite liner system in the PSSA consists of either a <br />minimum of 12 inches of compacted SLF overlain by a layer of either <br />100-mil single-sided textured LLDPE geomembrane (textured side down), <br />or 100-mil double-sided textured LLDPE geomembrane, with the <br />exception of the Phase Iva and Phase IVb ore slope portion of the PSSA. <br />The Phase IVa and Phase IVb ore slope portion of the PSSA was graded, <br />shaped, and compacted to meet project specifications. The graded Phase <br />IVa ore slope was then overlain with 100-mil smooth LLDPE <br />geomembrane. Note that the Phase IVa ore slope is underlain by the <br />Phase IVa liner system. <br />• The secondary geomembrane liner is covered by a minimum of 3 feet of <br />LVSCF. The LVSCF is overlain by the primary liner. <br />• The primary liner system consists (depending on location) of either <br />100-mil smooth LLDPE geomembrane, 100-mil single-sided textured, or <br />0 <br />AMEC Earth & Environmental, Inc. <br />2000 S. Colorado Blvd 2-1000 <br />Denver, CO 80222 <br />Tel 303-935-6505 <br />Fax 303-935-6575 www.amec.com <br />16