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COR-030000 Stormwater Management Plan <br />ii) Seed and stabilization (temporary and permanent Uound cover) <br />Seeding involves the mechanical or hand application of specific seed mixes <br />appropriate for the site location and soil type. Seeding provides plan t growth to <br />stabilize the soil reducing the likelihood of erosion or sediment transport. As soon as <br />practical, after the completing of earth disturbing activities, soil should be properly <br />prepared and seeded. The choice of seed mix will dictate application rates and <br />methods. Seeding should be accompanied by an additional BMP, such as mulching <br />t:ackifying, or surface roughening to protect the seed and soil from erosion during the <br />germination and growth process. Seed areas should be inspected to ensure that the <br />soil stabilization method (e.g. surface roughening, crimp mulch, hydro-mulch, etc.) <br />was applied correctly and has not been compromised. The area should also be <br />inspected for erosion and/or sediment deposition. Maintenance items would include <br />re-grading and seeding bare or areas of thin vegetative growth and/or adding <br />additional BMPs as appropriate. If seeding cannot be accomplished due to seasonal <br />or other constraints, temporary stabilization, such as mulch and/or mulch tackifier <br />shall be used. This temporary stabilization will be inspected and maintained until <br />permanent seeding is allowed. Seeding methods and maintenance will also be <br />consistent with those described in Sections 4.7 and 5.0 in the Plan of Operations for <br />Sunday Mines. <br />iii) Surface roughening <br />Surface roughening consists of grooves or tracks installed in the soil surface, parallel <br />to the slope. This is a temporary soil stabilization technique that works well in areas <br />that will remain inactive for a short time. Surface roughening works by reducing <br />water velocity and promoting infiltration, thus decreasing the potential for erosion to <br />occur. Any disturbed areas with no earth disturbing activity planned for longer than <br />14 days may be surfaced roughened. This may include areas where scheduling <br />prevents the immediate implementation of final stabilization practices, the sides of <br />stock piles or other slopes. Surface roughening may be applied by creating a <br />continuous furrow parallel to the slope. This can be done with the teeth on a loader <br />bucket, ripping, disking or plowing equipment. Surface roughening can also be <br />created by running tracked equipment up and down the slope. Inspection of surface <br />roughened areas would include proper implementation, structural integrity and areas <br />of erosion or sediment accumulation. Maintenance for surface roughening would <br />include re-applying the technique or installation of new or additional BMPs. <br />iv) Preserving of existing vegetation <br />• <br />0 <br />Existing and new vegetation will be maintained to the extent practicable to help <br />prevent erosion and reduce the potential for sediments to become suspended in <br />stormwater flows. Vehicle equipment travel will be confined to existing roads, mine <br />access roads and the disturbed mine workings area to prevent destruction of 10 <br />vegetation. Inspections include observation for sediment accumulation or erosion to <br />Denison Mines (USA) Corp. Sunday Mines SWMP <br />13