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The second component of the closure underdrain is passive drainage of water from the <br />SGVLF closure drain into the diatreme present beneath the facility. During construction <br />of the closure drain during Phase 1 construction of the SGVLF, drilled shafts will be <br />advanced a minimum of 10 feet into the diatreme foundation from the closure drain to <br />provide a long -term flow path for flows from the closure drain to enter the diatreme. <br />7.2.2 Construction Sequence <br />The construction elements described below use the same techniques that have been <br />successfully employed for construction of the AGVLF. Except as noted herein, these <br />construction methods have been previously approved by the OMLR. <br />The SGVLF will likely be constructed in two stages: Phase 1 and Phase 2. The limits of <br />geomembrane liner for each phase may vary somewhat from that contained in the design <br />drawings presented in Appendix 9, Volume V. Development of phases will be dependent <br />on a number of factors including, but not limited to, climatic conditions, mine <br />sequencing, contractor availability, and other related factors. <br />Construction of Phase 1 of the SGVLF, the toe berm, mill platform, and PSSA <br />(including the SGADR), is anticipated to begin in 2012 and take about three construction <br />seasons to complete. Utilities within the SGVLF area footprint will be relocated and a <br />portion of SH 67 will be realigned in 2012 to 2013, followed by preparation of the <br />subgrade. Construction of the High Grade Mill facilities platform will begin in 2012 to <br />prepare for construction of the High Grade Mill facilities. The SLF is expected to be <br />constructed in 2013. The geomembrane liner will be placed in 2014. Phase 2 of the <br />SGOSA is expected to be completed in two years by 2017. The actual construction <br />schedule will depend on various factors, with weather conditions during the construction <br />season being an important consideration. <br />7.2.2.1 Clearing and Soil Stripping <br />Preparation of the foundation for the SGVLF includes clearing and grubbing of <br />vegetation and removal of unsuitable foundation material. Information obtained from test <br />pits indicate that suitable growth medium material is available within the SGVLF area. <br />Portions of the area have been affected by previous activities and growth medium <br />material will be limited in that area. The actual quantity of growth medium available <br />may vary from the estimated volumes. This growth medium will be placed in one of the <br />stockpiles as shown on Drawing C -4b. <br />7.2.2.2 PSSA Embankment Construction and Relocation of SH 67 <br />Cripple Creek & Victor Gold Mining Company <br />Cresson Project Mine Life Extension 2 <br />7 -8 <br />