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Title: Supplemental Environmental Assessment #548 : Design Revisions for Jean Lafitte National Historical Park and Preserve Marsh Mitigation Features Final Environmental Assessment and Assessment of Effect : West Bank and Vicinity Hurricane and Storm Damage Risk Reduction System, Jefferson Parish, Louisiana
Authors: United States. Army. Corps of Engineers. Mississippi Valley Division
Keywords: Jean Lafitte National Historical Park and Preserve (La.)
Flood control
Environmental protection
Environmental management
Publisher: United States. Army. Corps of Engineers. New Orleans District.
Abstract: The PIER #37, entitled West Bank and Vicinity (WBV) Hurricane and Storm Damage Risk Reduction System Mitigation, Jefferson, Lafourche, Plaquemines, and St. Charles Parishes, Louisiana identified the overall plan for mitigating impacts to fresh marsh, swamp, dry bottomland hardwoods ( BLH-Dry ) and wet bottomland hardwoods ( BLH-Wet ) incurred as a result of construction of the WBV HSDRRS. Properties impacted included JELA and the Environmental Protection Agency’s (EPA) Bayou aux Carpes Clean Water Act Section 404c area. Projects on JELA were identified in the PIER #37 mitigation plan to mitigate impacts to general fresh marsh; to Park fresh marsh, swamp and BLH-Wet; and to 404c BLHWet and swamp through the restoration and/or enhancement of said habitat types. These projects were programmatic in nature and required further analysis and agency coordination before National Environmental Policy Act compliance was considered complete and the projects therefore constructible. Such analysis and coordination occurred during completion of the PIER #37, Tier 1 EA. This assessment supplements the PIER #37, Tier 1 EA by addressing recent project design modifications related to the expansion of the borrow area within Lake Cataouatche, the use of a mechanical dredge for borrow excavation, access dredging (i.e., deepening) in Bayou Segnette and in Lake Cataouatche, and a slight increase in the footprint of retention dikes. This assessment focuses on the design modifications necessary to construct the two fresh marsh mitigation components (i.e., projects) addressed in PIER #37 Tier 1, specifically JL1B4 (park fresh marsh) and JL1B5 (general fresh marsh). The projects, like the remainder of those addressed in PIER #37 Tier 1, would remain exempt from the requirement for a wetland statement of findings under NPS wetland policies in Director’s Order 77-1 and its accompanying Procedural Manual (2016) because they satisfy the terms and conditions of Excepted Action in the Procedural Manual: “Actions designed to restore degraded (or completely lost) wetland, stream, riparian, or other aquatic habitats or ecological processes.”
Description: Supplemental Environmental Assessment and Finding of No Significant Impact
Rights: Approved for Public Release; Distribution is Unlimited
Appears in Collections:Environmental Documents

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