2011-11-02_HYDROLOGY - C1980006 - Laserfiche WebLink

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5. Shellfish Beds No activity may occur in areas of concentrated shellfish populations, unless the activity is directly related to a shellfish harvesting activity authorized by NWPs 4 and 48. 6. Suitable Material No activity may use unsuitable material (e.g., trash, debris, car bodies, asphalt, etc.). Material used for construction or discharged must be free from toxic pollutants in toxic amounts (see Section 307 of the Clean Water Act). 7. Water Supply Intakes No activity may occur in the proximity of a public water supply intake, except where the activity is for the repair or improvement of public water supply intake structures or adjacent bank stabilization. 8. Adverse Effects From Impoundments If the activity creates an impoundment of water, adverse effects to the aquatic system due to accelerating the passage of water, and /or restricting its flow must be minimized to the maximum extent practicable. 9. Management of Water Flows To the maximum extent practicable, the pre - construction course, condition, capacity, and location of open waters must be maintained for each activity, including stream channelization and storm water management activities, except as provided below. The activity must be constructed to withstand expected high flows. The activity must not restrict or impede the passage of normal or high flows, unless the primary purpose of the activity is to impound water or manage high flows. The activity may alter the pre- construction course, condition, capacity, and location of open waters if it benefits the aquatic environment (e.g., stream restoration or relocation activities). 10. Fills Within 100 -Year Floodplains The activity must comply with applicable FEMA- approved state or local floodplain management requirements. 11. Equipment Heavy equipment working in wetlands or mudflats must be placed on mats, or other measures must be taken to minimize soil disturbance. 12. Soil Erosion and Sediment Controls Appropriate soil erosion and sediment controls must be used and maintained in effective operating condition during construction, and all exposed soil and other fills, as well as any work below the ordinary high water mark or high tide line, must be permanently stabilized at the earliest practicable date. Permittees are encouraged to perform work within waters of the United States during periods of low -flow or no -flow. 13. Removal of Temporary Fills Temporary fills must be removed in their entirety and the affected areas returned to pre - construction elevations. The affected areas must be revegetated, as appropriate. 14. Proper Maintenance Any authorized structure or fill shall be properly maintained, including maintenance to ensure public safety.