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be completed. The closure drain consists of a minimum 3 -foot thick layer of drainage <br />gravel (the same structural fill material being used for the underdrains) enclosed in a <br />geotextile. <br />7.2.2.5 Construction of Leak Detection <br />The LDS will be installed in the prepared subgrade prior to SLF placement. Design of the <br />LDS was discussed above in Section 7.2.1.6. After completion of the LDS, the SLF will <br />be placed both to provide protective support for the geomembrane and to provide the base <br />component of the composite liner system. The SLF will be comprised of a minimum one- <br />foot -thick layer of material with a permeability of 1 x10 cm/sec or less. It is anticipated <br />that the material will meet applicable Technical Specifications without the addition of <br />bentonite; however, bentonite will be used as necessary to meet permeability <br />requirements. The SLF will be placed and compacted, then tested by a professional <br />engineer or other appropriately qualified professional to ensure that it meets the technical <br />specifications (see Appendix 9, Volume V for a complete copy of the technical <br />specifications). <br />The composite liner system selected for the SGVLF area is discussed in Section 7.2.2 <br />above and further described in the accompanying design report in Appendix 9, Volume <br />V. The composite liner system will be installed in accordance with the technical <br />specifications included in Appendix 9, Volume V. A qualified liner installation company <br />will install the liner and their work will be overseen by a professional engineer or other <br />appropriately qualified professionals, as has been done for construction of previous <br />phases. The completed liner installation, including copies of all required tests performed <br />on the liner, will be presented in a report that will be submitted to the OMLR for review <br />and acceptance prior to initiating solution application and leaching. <br />The "construction season" for installation of the critical liner portions of the SGVLF has <br />been tentatively identified for this site from about mid -April to mid - November. CC &V <br />also has been approved to use "cold weather seaming techniques" for synthetic liner <br />materials when temperatures are lower than 35 °F. As such, excavation and some filling <br />may be possible at other times in addition to this "construction season window." Section <br />7.2.2.7 below discusses the restrictions on liner installation. <br />The upper geomembrane liner and HVSCS will be covered by the two -foot thick <br />(minimum) lift of DCF (crushed ore) for protection. CC &V will continue to use ore <br />material which meets the applicable technical specification as appropriate for DCF. Ore <br />material to be used as DCF which requires screening (and perhaps crushing, if needed to <br />Cripple Creek & Victor Gold Mining Company <br />Cresson Project Mine Life Extension 2 <br />7 -11 <br />