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DRAINAGE IMPROVEMENTS TO PREVENT BACKWATER FLOOIDNG ALONG ST CHARLES BY-PASS ROAD IN LAFOURCHE PARISH

NAME OF APPLICANT: North Lafourche Conservation Levee and Drainage District, c/o Duplantis Design Group, Attn: Matthew Rodrigue, 314 East Bayou Road, Thibodaux, Louisiana 70301.

LOCATION OF WORK: Located along an existing residential street (St. Charles By-Pass Road) within the St. Charles Royalle Subdivision, in Thibodaux, Louisiana, in Sections 21 and 22, Township 15 South, Range 17 East, located in Lafourche Parish, as shown on the enclosed drawings (Latitude 29.73754 N Longitude -90.73335 W). This project is located in Deltaic Basin (East Central Louisiana Coastal HUC 08090301).

CHARACTER OF WORK: The applicant is requesting a Department of the Army permit authorization for the construction of the St. Charles By-Pass Road Backwater Flood Prevention drainage improvement project. The project is proposed to prevent future backwater flooding events from the 40 Arpent Canal located along the southern portion of the road and project area. The project entails the widening of an existing ditch that is located behind the properties west of the road. A 48-inch flap gate culvert is proposed to be installed and maintained at the end of the ditch. An approximate 3,000-foot earthen berm is proposed to be constructed at an elevation of +5.5 feet elevation. An existing ditch to the west of the proposed berm will be cleaned and a flap gate culvert is proposed to be installed at the end of the ditch to ensure proper drainage. Along the eastern side of the road behind the existing properties, a small ditch is proposed to be excavated to drain these back lots. An earthen berm is also proposed to be constructed east of this ditch to prevent re-circulation of water from the 40 Arpent Canal back into the subdivision. Approximately 9,114 cubic yards of native material would be excavated and, of that, approximately 5,886 cubic yards would be placed as fill onsite as a result of project implementation. Approximately 3,228 cubic yards of excavated material would be hauled offsite and placed in a Parish approved upland area. Approximately 3.15 acres of herbaceous wet pasture and 2.35 acres of forested wetlands would be impacted as a result of the project. The applicant has claimed that the project has been designed to avoid and minimize direct and secondary adverse wetland impacts to the maximum extent practicable. The applicant is proposing to compensate for the unavoidable impact by purchasing mitigation credits from an approved mitigation bank.

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