Laserfiche WebLink
• <br />March 2000 <br />-60- <br />993-2099.150 <br />7.4 MG of operating volume which represents 30 feet of operating head <br />in the Phase I PSSA, y <br />~ 4.0 MG of solution draindtityn volume which represents 12 hours of <br />draindown based on a maximum anticipated solution application rate of <br />5,600 gpm, <br />12.5 MG of solution accumulation due to seasonal climatic variation at a <br />95 percent confidence level, <br />10.2 MG associated with the 100-year, 24-hour design storm event, and <br />10.8 MG of solution associated with the field capacity of the ore within <br />the Phase I PSSA. <br />u <br />• <br />The calculated volume of the Phase I PSSA solution exceeds the available storage by <br />approximately 6.4 MG. Therefore, the excess Phase I PSSA solution will be routed to the <br />20 MG capacity Phase I/II/III External Pond for storage. <br />Golder recomputed the storage volume available for the Phase II PSSA based on the recent <br />ore consolidation testing and the average normal stress within the PSSA from the Phase IV <br />ore plan. Golder used the average ore loading of 153 psi, corresponding to an average ore <br />depth of 200 feet over the PSSA assuming an average wet bulk density of 110 pcf. Using <br />the load-porosity relationship for Cresson ore presented in Appendix B~-1, this <br />corresponds to a porosity of 0.32, and yields a pore volume of 42.4 MG to elevation 9,307 <br />feet. <br />The results of the water balance model indicate that approximately 49.9 MG will be the <br />requred storage for the Phase II PSSA. The 49.9 MG of required storage includes: <br />1:\94110941FINAL REPoRT1099MAINLDOC Golder Associates <br />