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COR-030000 Stormwater Management Plan <br />drainage systems, and the surrounding area. The basins are formed by excavating an <br />area or by placing an earthen embankment across a low area or drainage swale. A <br />spillway is often constructed using large stones or aggregate to slow the release of <br />runoff. Maintenance activities include removing the sediments when the basin <br />reaches about 50 percent. Inspect the basin after each runoff event to ensure that it is <br />draining properly, and check the structure for damage from erosion. <br />viii) Water Bars <br />Earth berm water bars are narrow, earthen ridges built across the flow direction to <br />divert or slow down the velocity of stormwater runoff. They are typically built on <br />either side of roadways, or areas on the mine sites that have larger exposed areas to <br />reduce exposed soil from moving, protecting the area until it is revegetated. They are <br />also used as a tool to enhance revegetation on areas that are no longer active. Water <br />bars will be inspected regularly and maintained until the area is successfully <br />revegetated. Maintenance involves rebuilding the water bars as needed due to <br />damage from vehicle traffic or erosion. <br />Additional BMPs may be added as site conditions change and will be identified in the <br />SWMP prior to installation. <br />2) Non Slruclura113ac1icesforL?rorion andSedimenl Conlrol?,¢I.C.3.c?2? <br />Non-structural practices are those practices which, when implemented, will minimize <br />erosion and sediment or other pollutant transport. Practices implemented at this site <br />include interim stabilization practices, permanent stabilization practices (see Section 4), <br />and site-specific scheduling for implementation of the practices, as well as site <br />management practices and personnel training. The potential BMPs for the project are <br />described below. Specific locations for BMP implementation at the site are indicated on <br />the site plans, provided in Appendix B. Appendix C provides the installation details for <br />BMPs identified in Appendix B. <br />i) Crim mulch <br />Crimp mulching uses hay or straw material that is machine crimped into the soil to <br />provide stability. Crimp mulch may be used on its own as a temporary soil <br />stabilization method, or in conjunction with seeding for final stabilization. Crimp <br />mulch functions as a soil stabilizer by decreasing the velocity of sheet flow. Mulch <br />will likely be crimped into the soil using either a drill seeder or notched disk plow to <br />the minimum depth of two inches and a maximum depth of four inches. To maximize <br />effectiveness crimping equipment must run parallel to the contours of the land. <br />Crimp mulch may not be appropriate for slopes that are equal to or greater than 3:1 or <br />in areas with hard or rocky soil in which the crimper cannot penetrate. Inspections <br />should look for areas where mulch is missing, thin or for areas where erosion has <br />occurred. Maintenance items would include re-grading as necessary and reapplying <br />as appropriate. <br />Denison Mines (USA) Corp. Sunday Mines SWMP <br />12