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a) The Atlas tailings /waste pile runoff will be collected and delivered to Sediment Pond #1. <br />Diversion ditches will reroute uphill undisturbed stormwater runoff away from the disturbed <br />areas of the Atlas waste pile. <br />b) The main Revenue Mine disturbance area will be collected and delivered to Sediment Pond #2. <br />Diversion ditches will reroute uphill undisturbed stormwater runoff away from the disturbed <br />areas of the Revenue waste pile. <br />c) The remaining disturbed area around the shop and the mill portal will be gathered and delivered <br />to Sediment Pond #3. Diversion ditches will reroute uphill undisturbed stormwater runoff away <br />from the disturbance areas. <br />d) As part of the Revenue Mine's opening under this new permit, the mine water will no longer <br />discharge into the pond west of the portal. The mine water will be conveyed to a perforated <br />pipe that will be buried in the inert pre mine waste rock of the Revenue waste pile area. <br />Maps C -2, C -3 and C -4 show the various stages of the mine operation. Map C -4 shows the <br />comprehensive system, when all structures are fully built and both tailings /waste piles will be in their <br />final contour. Map G -1 shows the stormwater basins, ditches, and ponds in a large view of the area that <br />drains towards the mine area. Map G -1B shows the stormwater basins, ditches and ponds of the mine <br />area in detail. Sediment ponds 1, 2, and 3 designs, including spillways and stage storage, can be found <br />on Maps G -2, G -3, and G -4 respectively. <br />The runoff for each stormwater basin has been calculated using SCS Curve Number Approach from <br />the USDA. The curve numbers selected for the different soil types is based on the hydrologic soil <br />group which is in turn determined by its water transmission rate (see Exhibit I). See Appendix 6 for all <br />stormwater basin details and calculations. <br />Revenue Mine August 2012 G -19 <br />