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These areas have been limited to locations within the SGVLF where the steeper slopes <br />will not affect stability of the facility. <br />Underground workings are located within the footprint of the SGVLF. These workings <br />will be further examined and stabilized as necessary utilizing the methodologies <br />previously approved and certified for the construction of the AGVLF under previous <br />amendments and as described in Appendix 9, Volume V. <br />Cut material, if suitable for use as structural fill, will be used for site grading and <br />foundation preparation activities. Because a deficit of fill material currently exists, <br />overburden material will also be utilized. During construction, overburden material to be <br />used will be segregated to meet the 24 -inch maximum particle diameter specification for <br />structural fill. <br />A possible source of clay borrow material was found within the footprint of the SGVLF <br />as shown on Drawing C -4. This clay borrow material is overlain by 2 to 5 feet of <br />unsuitable material consisting of growth medium and clean sands and gravels that will <br />have to be removed to access the borrow material. The borrow area has been estimated <br />to contain approximately 500,000 yd of in -place clayey soils that may be used to <br />produce SLF. A portion of the potential borrow area underlies the proposed High Grade <br />Mill facilities platform and will require excavation and removal prior to construction of <br />the mill platform regardless of whether or not this material is used for the SLF. <br />A portion of the SGVLF will be constructed over the existing SGOSA. As part of the site <br />construction, the slopes of the SGOSA will be regraded to 2.0H:1 V. Given the particle <br />size distribution of materials within the SGOSA (boulders to sand size), there is a <br />potential for differential settlement to occur on the slope as the SGVLF is loaded with <br />ore. To reduce the impact of differential settlement, a three foot layer of structural fill <br />may be placed and compacted over the regraded slope. In some areas, geogrid and/or <br />geotextile may be placed on the regraded slope prior to placement of the structural fill. <br />The geosynthetic materials will help bridge gaps in the regraded slope and help distribute <br />the differential settlement. <br />7.2.2.4 Closure Drain and Boreholes to Diatreme <br />During foundation preparation activities, drilled shafts will be advanced a minimum of 10 <br />feet into the diatreme to provide a preferential flow path after closure for flows from the <br />PSSA as discussed in Section 7.2.1.7. Prior to construction of the liner system for the <br />PSSA portion of the SGVLF, the closure drain connecting to the drilled shafts will also <br />Cripple Creek & Victor Gold Mining Company <br />Cresson Project Mine Life Extension 2 <br />7 -10 <br />