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2. United States Army Corps of Engineers (USACE)
3. South Atlantic Division
4. Wilmington District
5. Environmental Documents

Title:	Detailed Project Report and Environmental Assessment : Hookerton, NC Section 14 Emergency Streambank and Shoreline Erosion Protection Project
Authors:	United States. Army. Corps of Engineers. Wilmington District.
Keywords:	Contentnea Creek (N.C.) Hookerton (N.C.) Erosion Environmental management Environmental control
Publisher:	United States. Army. Corps of Engineers. Wilmington District.
Abstract:	This Detailed Project Report and Environmental Assessment (DPR/EA) presents the findings of the Hookerton, NC Section 14 Emergency Streambank and Shoreline Erosion Protection Study, and has been prepared to document the plan formulation process and potential environmental effects associated with the implementation of emergency streambank and shoreline erosion protection alternatives for the project site. The geographic scope of the Hookerton, NC Section 14 project consists of a Town of Hookerton wastewater treatment facility, specifically Lagoon #1, located along the embankment of Contentnea Creek in Hookerton, NC. The overall goal of the Hookerton, NC Section 14 project is to provide reliable protective measures to prevent the ongoing streambank erosion at the site from destructively impacting Lagoon #1 and the associated wastewater treatment facility. Section 14 of the Flood Control Act of 1946, as amended, is a Continuing Authorities Program (CAP) focusing on relatively smaller water resource-related projects not requiring specific Congressional authorization. The Section 14 program is designed for protection of essential, properly-maintained public facilities in imminent threat of damage or failure from natural streambank and shoreline erosion processes. The subject wastewater treatment facility qualifies under the Section 14 program, since it is maintained by the Town of Hookerton as a key element of the municipal wastewater system, and is under imminent threat of damage or failure from continuing streambank erosion at the site. This DPR/EA summarizes baseline existing conditions in the project area. It also develops and discusses potential solutions as a guide to Federal and non-Federal partnership in a protection project. This DPR/EA provides a description and discussion of the existing conditions in the project area, and the likely array of alternative plans evaluated, including their benefits, costs, and environmental effects. This report also identifies, evaluates, and recommends a solution (the Recommended Plan) that best meets the planning objectives of protecting the wastewater treatment facility from damaging streambank shoreline erosion. The Recommended Plan (Stone (Rip Rap) Slope Protection) would consist of a layer of stone (Rip Rap) placed over a layer of bedding stone along approximately 550 linear feet of streambank and extending for a distance of approximately 40-50 feet from the top of the existing streambank in the oxbow bend of Contentnea Creek adjacent to Lagoon #1. The streambank would be cleared and graded to a 1.5H:lV to 2H:1V slope (depending on segment) for placement of the streambank slope protection. Below the ordinary high water line, backfill material consisting of NCDOT #57 stone would be placed over a geotextile layer, graded, and compacted as required to provide a smooth sloped surface for the placement of the stone. Above the ordinary high water line, backfill material consisting of satisfactory fill (earth) material would be placed on the existing cleared streambank, graded, and compacted as required to provide a smooth sloped surface for placement of the stone slope protection. The streambank slope protection measures would consist of a 1’ layer of bedding stone (NCDOT #57 stone) and a 27" thick layer of NCDOT Class II riprap placed over a layer of geotextile and graded fill slope. Toe protection will be placed along the toe of the stream bottom. The stone toe protection will be placed to distance of approximately eleven (11) feet to eighteen (18) feet from the toe and to a height of approximately 3 feet above the stream bottom. Materials staging would take place in previously disturbed areas. Vegetative clearing not to exceed one acre may be required to accommodate necessary equipment. Several project costs that reflect the changing value of money over time have been calculated for the Recommended Plan. These estimated costs are documented in the cost appendix and reflect the changing value of money over time. For simplicity in the main report, the Direct Construction Cost figure is used. The Direct Construction Cost of the Recommended Plan would be $941,000 (does not include detailed design and construction management). Total Project Costs including detailed design and construction management are $1,306,000. The figure of $1,306,000 is used as the basis for cost sharing. The Fully Funded Federal cost-share for the Recommended Plan is $849,000, which is 65% of $1,306,000. In addition to the $1,306,000, all feasibility phase costs will be Federally funded, as they will not exceed $100,000. The Fully Funded non-Federal cost-share of 35% is $457,000. The non-Federal sponsor fully supports the Recommended Plan.
Description:	Detailed Project Report and Environmental Assessment
Rights:	Approved for Public Release; Distribution is Unlimited
URI:	https://hdl.handle.net/11681/37194
Size:	104 pages / 13.52 MB
Types of Materials:	PDF/A
Appears in Collections:	Environmental Documents