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MVN-2009-002156-CQ

Published Oct. 22, 2020

Expiration date: 11/16/2020

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NAME OF APPLICANT: East Ascension Drainage District No.1, Attn: Michael Enlow, 42077 Churchpoint Road, Gonzales, Louisiana 70737.

LOCATION OF WORK: Located along at approximate 16,168-linear foot reach of the New River Canal, in Sections 20, 28, & 30, Township 9 South, Range 3 East, east of Interstate 10, near Gonzales, Louisiana, located in Ascension Parish, as shown on the enclosed drawings (P.O.B.- Latitude 30.23285 N Longitude -90.94662 W, P.O.E.- Latitude 30.23534 N Longitude -90.90567 W). This project is located in the Pontchartrain Basin (Amite River HUC 08070202).

CHARACTER OF WORK: The applicant is requesting a permit modification to an existing Department of the Army permit authorization for the installation and maintenance of two (2) 42-inch diameter pipes with manually actuated slide gates at both the New River Weir and the Smith Bayou Weir. Under this proposed modification, the existing weir structures would remain in place and be modified with the installation of pipes and slide gates. This work would be performed using regular and long-reach excavators working from the canal banks and potentially within the canals themselves. Installation of temporary coffer-dams may be necessary to perform the work. No excess rip-rap material will be generated under this activity. Rip rap material that is removed for the installation of the pipes and gates will be reused to armor around the pipes and gates. An additional 220 cubic yards of rip-rap material will be installed around the weirs for armoring as well. The previous permit allowed for removal of the weirs in their entirety. Implementation of this proposed modification would result in a decrease of approximately 41.67 cubic yards in the total amount of rip-rap material added to the existing channel. The proposed installation of the pipes and gates into the two (2) existing weir structures would allow for the periodic de-watering of the upstream canals for maintenance and for storm water storage in advance of extreme weather events and would allow the existing weir structures to remain in place and serve their intended purposes. The existing weirs help maintain water levels at a constant level for maintenance of aquatic life, erosion control, treated wastewater discharge, and recreation. The remainder of the previously permitted activities as described in the original permit and previous permit modifications would be conducted as previously permitted. 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 utilize best management practices during and after the construction phase of the project. The original permit was authorized on May 13, 2019, was subsequently modified on April 8, 2020, and has an expiration date of May 31, 2024. No compensatory mitigation is anticipated at this time for this proposed modification.