Laserfiche WebLink
28,2002 -10- 003-2203 <br />The predicted maximum volume of solution exceeds the available storage by approximately <br />11.5 MG. Therefore, the excess Phase I PSSA solution is routed to the Phase II PSSA. <br />3.2 Phase II PSSA <br />Golder computed the storage volume available for the Phase II 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 153 psi, corresponding to an average ore depth <br />of 200 feet over the PSSA assuming an average wet bulk density of 110 pcf. Using the <br />load-porosity relationship for Cresson ore, this corresponds to a porosity of 0.32, and yields a <br />pore volume of 39.4 MG to elevation 9,305 feet. <br />The results of the water balance model indicate that approximately 58.6 MG will be the <br />maximum quantity of solution reporting to the Phase II PSSA. The 58.b MG of required storage <br />consists of the following: <br />- 11.5 MG of solution outflow from the Phase I PSSA that reports to the <br />Phase II PSSA (there is no contribution from the Phase IV PSSA); <br />- 3.8 MG of operating volume which represents 20 feet of operating head in <br />the Phase II PSSA; <br />- 4.3 MG of solution draindown. volume which represents 12 hours of <br />draindown based on a maximum anticipated solution application rate of <br />5,800 gpm; <br />- 15.4 MG of solution accumulation due to seasonal climatic variation at a <br />95 percent confidence level; <br />- 11.0 MG associated with the 100-year, 24-hour design storm event; and <br />- 12.6 MG of solution associated with the field capacity of the ore within <br />the Phase II PSSA. <br />t:WO~izo3~aoo~PxaWiR6nwsozwaiuozoaoo.oaszo.noC Golder Associates <br />