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2002 -I1- 003-2203 <br />The calculated volume of the Phase II PSSA solution exceeds the available storage by <br />approximately 19.3 MG. Therefore, the excess Phase II PSSA solution will be routed to the <br />22.5-MG capacity External Storage Pond. <br />3.3 Phase N PSSA <br />Golder computed the storage volume available for the Phase IV 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 0.305, and <br />yields a pore volume of 53.5 MG to an elevation of 9,624 feet. <br />The results of the water balance model indicate that approximately 52.8 MG will be <br />maximum quantity of solution reporting to the Phase IV PSSA. The 52.8 MG of required <br />storage consists of the following: <br />- 6.5 MG of operating volume which represents an average 20 feet of <br />operational head in the Phase IV PSSA; <br />- 5.8 MG of solution draindown volume which represents 12 hours of <br />draindown based on the maximum anticipated solution application rate of <br />8,000 (gpm); <br />- 14.8 MG of solution accumulation due to seasonal climatic variation at a <br />95 percent confidence level; <br />- 12.3 MG associated with the 100-year, 24-hour design storm event; and <br />- 13.4 MG of solution associated with the field capacity of the ore within <br />the Phase IV PSSA. <br />The maximum amount of solution reporting to the Phase IV PSSA does not exceed the PSSA <br />capacity of 53.5 MG, therefore the Phase IV PSSA solutions (plus contingencies) are fully <br />contained. <br />t:wouzoTOaomeHawrrtsni.osozwo3~zaa.oaoa.o~azanoc Golder Associates <br />