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Addendum to the Environmental <br />Geochemistry Investigation of Soil and <br />Rock Materials, Sunday Mines Group <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 Sunday Mines Group Environmental Protection Plan. The <br />following information addresses DRMS' comment regarding application of the <br />UNSAT-H model to high-intensity short-term precipitation events. A sensitivity <br />analysis of the simulated precipitation rate was conducted using UNSAT-H, which <br />evaluated the effect of various simulated precipitation rates on the estimated <br />percolation of water through development rock piles. The attached calculation brief <br />provides a detailed description of the sensitivity analysis and the results of this work. <br />u <br /> <br />??Qel <br />0 JAiv ® AeD <br />Oi KS nnO0 Fi?,i ®?® <br />Mih hg an sarI a on <br />ety , <br />