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May 28, 2002 -9- 003-2203 <br />3.0 WATER BALANCE RESULTS <br />This section presents discussions on the results of the revised water balance for the Phase N <br />VLF. In the following sub-sections, the results for each PSSA are presented. The tabulaz <br />results of the water balance are presented in Appendix D. Supporting graphs and calculations <br />aze also presented in Appendix D. <br />3.1 Phase I PSSA <br />Golder computed the storage volume available for the Phase I PSSA based on the ore <br />consolidation testing and the average normal stress within the PSSA from the Phase IV ore <br />plan. Golder used the average ore loading of 305 psi, corresponding to an average ore depth <br />over the PSSA of 400 feet assuming an average wet bulk density of 110 pcf. Using the <br />load-porosity relationship for Cresson ore, this corresponds to a dry porosity of 0.30, and <br />yields a pore volume of 42.9 MG to an elevation of 9,365 feet. <br />The results of the water balance model indicate that approximately 54.4 MG will be the <br />' maximum quantity of solution (including contingencies) reporting to the Phase I PSSA. The <br />54.4 MG of solution consists of the following components: <br />- 5.5 MG of operating volume which represents 30 feet of operating head in <br />' the Phase I PSSA; <br />- 4.3 MG of solution draindown volume which represents 12 hours of <br />' draindown; <br />- 18.4 MG of solution accumulation due to seasonal climatic variation at a <br />~ 95 percent confidence level, <br />- 12.0 MG associated with the 100-year, 24 hour design storm event; and <br />- 14.2 MG of solution associated with the field capacity of the ore within <br />the Phase I PSSA. <br />Golder Associates <br />