Laserfiche WebLink
\, i <br />SMITH WILLIAMS CONSULTANTS, INC. <br />• <br />been designed so that leach solution applied within the lined area will flow through the ore and <br />be collected by an internal PSSA. <br />The site-grading plan was developed based on the May 2007 topographic survey information <br />from Foresight West. Growth media removed from the footprint of the Phase 5 VLF area will be <br />stockpiled in an area designated by CC&V for use during reclamation. In general, areas of the <br />Phase 5 VLF where the natural grade is in excess of 2.SH:1V, the grade will be reduced to <br />2.SH:1V by excavating or by compacting structural fill in controlled horizontal lifts prior to SLF <br />placement. However, there are some areas within the Phase 5 VLF that have been designed at <br />2.OH:1 V due to site constraints. These areas have been limited to locations within the Phase 5 <br />VLF where the steeper slopes will not affect stability of the facility. The final site grading <br />contours may vary from those shown on the foundation-grading plan drawing to suit natural <br />conditions encountered during construction. Variations from the designed grading plan need to <br />be evaluated to assess the Phase 5 VLF performance and stability. Typical cross. sections for the <br />Phase 5 VLF are shown on Drawing A210. <br />As discussed in Section 2.4 and presented in Appendix D, underground workings are located <br />within the limits of the Phase 5 VLF. These workings will need to be remediated as part of the <br />foundation preparation. The remediation details for the underground workings are presented in <br />Drawing A270. <br />Cut material, if suitable for use as structural fill, will be used for site grading and foundation <br />preparation activities. In addition, mine overburden material obtained from the mining <br />operations may be used in some areas requiring fill. During construction, this material will be <br />segregated to meet the 24-inch maximum particle diameter specification for structural fill. <br />A portion of the Phase 5 VLF will be constructed over the AGOSA. As part of the site <br />construction, the slopes of the AGOSA will be regraded to form slopes suitable for <br />geomembrane liner deployment and stability. Given the particle size distribution of materials <br />within the AGOSA (boulders to sand size), there is potential for differential settlements to <br />develop on the slope as the VLF is loaded with ore. To reduce. the influence of differential <br />settlements, a-3-foot-thick layer of structural fill will-be placed and compacted over the regraded <br />slope. In some areas, geogrid and/or geotextile may be placed on the regraded slope prior to <br />placement of the structural fill. The geogrid/ geotextile will help bridge between gaps in the <br />regraded slope and help distribute localized differential settlements. <br /> <br />S:\PROJECTS\1125 CC&V PHASE 5 VLFlH2 - DESIGMAREQUA VLF\VLF PHASE 5 FINAL REPORT V2.DOC 22 <br />