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`' <br />SMITH WILLIAMS CONSULTANTS, INC. <br /> <br />presented in Figures 5 through 9 include all process and contingency flows. Additional model <br />output is presented in Appendix G. <br />The predicted pond volume for the Phase I PSSA is presented in Figure 5. The capacity of the <br />Phase I PSSA was calculated based on the average ore depth of 420 feet presented in the ore- <br />stacking plan shown in Figure 3. Using the load-porosity relationship for Cresson ore presented <br />in Appendix B, this corresponds to a porosity of 0.30, and yields a pore volume of 42.9 million <br />gallons (MG) at an elevation of 9,365 feet. Eighty percent of the total Phase I PSSA volume is <br />34.3 MG, which corresponds to an elevation of 9,358.8 feet. As shown, the Phase I PSSA is <br />predicted to fully contain all solutions, including contingency inflow, reporting to the PSSA. <br />The Phase I PSSA also has sufficient capacity to fully contain the contents of the Enrichment <br />Tank located on Phase I (100,000 gallons of solution), should this tank fail unexpectedly. <br />Figure 6 presents the volume time series for the Phase II PSSA. The capacity of the Phase II <br />PSSA was calculated based on the average ore depth presented in the ore-stacking plan <br />presented in Figure 3. The average ore within the PSSA is 220 feet. Using the load-porosity <br />relationship for Cresson ore presented in Appendix B, this corresponds to a porosity of 0.32, and <br />yields a pore volume of 35.4 MG at an elevation of 9,302 feet. Eighty percent of the total Phase <br />II PSSA volume is 26.1 MG, which corresponds to an elevation of 9294.4 feet. As shown, the <br />Phase II PSSA is predicted to fully contain all solutions, including contingency inflow, reporting <br />to the PSSA. <br />The volume time series for the Phase IV PSSA is presented in Figure 7. The capacity of the <br />Phase IV PSSA was calculated based on the average ore depth presented in the ore-stacking-plan <br />presented in Figure 3. The average ore within the PSSA is 440 feet. Using the load-porosity <br />relationship for Cresson ore presented in Appendix B, this corresponds to a porosity of 0.31, and <br />yields a pore volume of 54.2 MG at an elevation of 9,624 feet. Eighty percent of the total Phase <br />IV PSSA volume is 43.4 MG, which corresponds to an elevation of 9,616.5 feet. As shown, the <br />Phase IV PSSA is predicted to fully contain all solutions, including contingency inflow, <br />reporting to the PSSA. The Phase IV PSSA also has sufficient capacity if CC&V decides to <br />actively pump water accumulated within the sedimentation pond to be installed as part of Phase <br />5 activities. While the sedimentation pond is sized to fully contain twice the run-off from 10 <br />year/24 hour storm event,- the intent is to maintain the pond dry. Precipitation and run-off <br />collecting within-the pond will either be pumped to the Phase IV PSSA or used elsewhere iri the <br />mine operation. The Phase IV PSSA is able to fully contain the contents of the sedimentation <br />pond, should it be required. <br />S:\PROJECTS\t 125 CCSV PHASE 5 VLF\H2 - DESIGNWREQUA VLF\VLF PHASE 5 FINAL REPORT V2.DOC 4S <br />