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Both of these structures can be seen on the Mine Plan Maps C-2 and C-3. It has been requested <br />by the landowner that both bridges remain in place after mining has been completed. <br />Stormwater and Sediment Control <br />Berms will isolate the site from the surrounding area. Therefore, all run-off will drain to the <br />pits or lakes. The pit or lake will contain the 100-Yeaz 24-Hour Event. The stormwater <br />volume was determined using the calculations below as described in the "Procedures for <br />Determining Peak Flows in Colorado", which includes and supplements Technical Release No. <br />55 "Urban Hydrology for Small Watersheds." The following calculations are for Mining Area <br />1. Similar calculations show that all mining areas will have more than the necessary <br />containment. All pits will need to be pumped at this operation. Prior to discharge, sediment <br />will be allowed to settle either in sediment ponds or previously mined pits. <br />7/22/04 Page D-2 <br />