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Addendum to the Environmental <br />Geochemistry Investigation of Soil and <br />Rock Materials, Van 4 Mine <br />Additional work was completed to address various technical adequacy issues <br />identified by the Colorado Division of Reclamation Mining and Safety in their August <br />28, 2009 comments to the Van 4 Mine Environmental Protection Plan. The following <br />information addresses DRMS' comment regarding application of the UNSAT-H <br />model to high-intensity short-term precipitation events. A sensitivity analysis of the <br />simulated precipitation rate was conducted using UNSAT-H, which evaluated the <br />effect of various simulated precipitation rates on the estimated percolation of water <br />through development rock piles. The attached calculation brief provides a detailed <br />description of the sensitivity analysis and the results of this work. <br />• <br />0 <br />