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COR-040000 Stormwater Management Plan <br />Additional optional erosion and sediment control BMPs that may be implemented at the <br />site include the following: <br />Check dams <br />Because some sediment will always be present in stormwater, check dams can be used in <br />ditches to reduce the velocity of the water and allow some settling of larger particles. <br />Diversion ditches <br />On-site erosion can be greatly decreased when off-site flows, not disturbed by mining <br />activities, are diverted around the site through diversion ditches or channels. Swales and <br />ditches may be used on a permanent or temporary basis to convey stormwater in a way <br />that minimizes the potential for contamination by sediment. Swales and ditches are used <br />to reduce the velocity of runoff and enhance particle settling. Swales and ditches may <br />also be utilized to divert flow away from the ore pad, DRA, mine shaft or portal, and <br />equipment storage area. <br />Seeding and mulching <br />Temporary seeding, using a native species seed mix as determined in the Plan of <br />Operations, will be used on topsoil stockpiles and disturbed areas that will remain <br />inactive for long periods of time. Permanent seeding will be conducted in disturbed areas <br />to achieve permanent vegetation. Seeding may be done in combination with another <br />stabilization measure, such as crimp mulching, and/or installation of erosion control <br />blankets as appropriate for the site slope. <br />Surface roughening <br />Surface roughening along contours or working areas may be used as temporary erosion <br />control. Also by planting across the slope for permanent erosion control, the contour <br />ridges slow the downhill flow of water. Water is held between these contours, thus <br />reducing water erosion and increasing soil moisture. <br />Temporary sediment traps <br />Sediment traps or catch ponds may be created and/or modified so that stormwater can be <br />intercepted before leaving the site. This might be accomplished by temporarily blocking <br />diversion ditches or outlet structures and allowing the sediment to settle before gradually <br />releasing the stormwater downstream. Sediment traps provide for settling of suspended <br />particles. <br />2) ?Ylalerrals ffandlirtg a?idSpillPrevention <br />Proper materials handling and spill prevention procedures are discussed in Sections 4.d <br />and 4.e, below. <br />c) Preventative Maintenance (COR-040000, §I.B.4.c): <br />Denison will implement a preventive maintenance program that includes the following: <br />A <br />Van 4 Shaft SWMP 8 Denison Mines (USA) Corp.