1999-11-24_PERMIT FILE - M1999051

Home Browse Search

• surface waters and where needed to protect other structural controls. After the snow melts and prior to the time when seeding is practicable, disturbed areas will be inspected regularly for evidence of erosion. Please review the enclosed Attachment 1- Reclamation Plan from the DMG 112 Permit Application for more information. Appropriate temporary stabilization measures, such as temporary seeding, mulching, and watering to control dust, may be implemented throughout construction to minimize the possibility of stormwater pollution. Additionally, any temporary control measures such as silt fences will be removed prior to seeding or mulching in order to minimize disturbance to final stabilization practices. Seeding/mulching will be performed in a manner sufficient to achieve an effective vegetative cover. 2.2 Erosion and Sedimentation Proper selection, implementation, and exact locations of the controls described here, as well as any other controls required to meet the intent of this plan, will be determined in the field by the permittee. 2.2.1 Stabilization Practices Stabilization measures generally control the potential for pollution at the source. They typically include preserving the natural vegetation, mulching, controlling dust, and revegetating as soon as possible after construction. Temporary stabilization practices and permanent stabilization practices will be incorporated in accordance with the DMG Reclamation Permit. Temporary stabilization, such as temporary seeding, mulching, and dust control in the form of watering, will be incorporated to minimize the potential for erosion. Temporary seeding reduces the potential for erosion by binding together the soil and trapping loose sediments. Mulching enhances vegetation growth and increases the infiltration rate of the soil. Dust settling on exposed surfaces during dry weather may be introduced into stormwater runoff during wet weather and can be a significant contributor to stormwater pollution. Therefore, dry surfaces, especially roadways, will be watered on an as- needed basis. 2.2.2 Structural Controls Structural controls are used to divert stormwater flows away from exposed areas, to prevent sediments and other pollutants from being carried off -site, and to eliminate runoff onto the site that may become polluted. These controls are briefly described below and in more detail in Attachment 3. Structural controls must be installed prior to commencing construction activities. • Silt Fences are fabric fences installed vertically on wooden posts or steel reinforcing bars, backed by 36 -inch high wire mesh. The posts should be placed at 6 -foot intervals with 3 feet extending above the ground surface. They allow 5