Manasquan Inlet to Barnegat Inlet Feasibility Study
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New Jersey Shore Protection Study US Army Corps of Engineers New Jersey Department of Philadelphia District Environmental Protection Manasquan Inlet to Barnegat Inlet Feasibility Study Volume 1 Final Feasibility Report Integrated Environmental Impact Statement Appendix G* – Pertinent Correspondence June 2002 New Jersey Shore Protection Study Manasquan Inlet to Barnegat Inlet Final Feasibility Report Integrated Environmental Impact Statement June 2002 U.S. Army Corps of Engineers Philadelphia District New Jersey Shore Protection Study Manasquan Inlet to Barnegat Inlet Final Feasibility Report and Integrated Environmental Impact Statement (EIS) June 2002 ABSTRACT: This feasibility report and Environmental Impact Statement presents findings of a study to determine a feasible hurricane and storm damage reduction plan for coastal communities located between Manasquan Inlet and Barnegat Inlet, NJ. The report describes the engineering, economic, social, and environmental analyses that were conducted to develop a selected plan of action. Potential impacts to cultural and environmental resources are evaluated herein in accordance with NEPA and Section 106 of the National Historic Preservation Act of 1966. NOTE TO READER: To provide full and convenient access to the environmental, economic, and engineering documentation prepared for the study, the EIS for this project has been integrated into this feasibility report in accordance with Engineering Regulation 1105-2-100. Sections required for compliance with the National Environmental Policy Act (NEPA) are noted by an asterisk (*) in the Table of Contents. Furthermore, Appendix G* – Pertinent Correspondence was bound with Volume 1 of the final report due to the significance of the content and to simplify the coordination process. New Jersey Shore Protection Study Manasquan Inlet to Barnegat Inlet Final Feasibility Report and Integrated Environmental Impact Statement (EIS) EXECUTIVE SUMMARY Proposed Action: Hurricane and storm damage reduction for communities between Manasquan Inlet and Barnegat Inlet, New Jersey using beach fill to construct a protective berm and dune. Location of Action: Boroughs of Point Pleasant Beach, Bay Head, Mantoloking, Lavallette, Seaside Heights, and Seaside Park; and Townships of Brick, Dover, and Berkeley. Type of Statement: Final Feasibility Report and Integrated Environmental Impact Statement (EIS) Lead Agency: U.S. Army Corps of Engineers, Philadelphia District More Information: For further information please contact: Paul Gaudini, P.E., Acting Chief, Planning Division Attn: Beth Brandreth, Environmental Resources Branch U.S. Army Engineer District, Philadelphia Wanamaker Building, 100 Penn Square East Philadelphia, PA 19107-3390 Telephone: (215) 656-6555 Executive Summary ES-1 Manasquan Inlet to Barnegat Inlet Final Feasibility Report Summary This report presents the results of a feasibility study to determine an implementable solution and the extent of Federal participation for a project that provides hurricane and storm damage reduction for communities located on the Atlantic coast of New Jersey between Manasquan Inlet and Barnegat Inlet. The lead agency for this study is the U.S. Army Corps of Engineers, Philadelphia District. The Manasquan Inlet to Barnegat Inlet study covers one of six study areas recommended by the New Jersey Shore Protection Study. The study was authorized by resolutions by the U.S. House of Representatives and U.S. Senate in December 1987. This feasibility report was prepared based on recommendations of the reconnaissance study completed in March 1996 that identified potential solutions to erosion and storm damage problems within the study area. The reconnaissance study determined that such a solution was in the Federal interest and identified the Non-Federal sponsor. The feasibility study was cost shared between the Federal Government and the State of New Jersey Department of Environmental Protection (NJDEP) and was conducted under provisions of the Feasibility Cost Sharing Agreement executed 17 April 1997. The study area is located in central New Jersey and extends approximately 24 miles from Manasquan Inlet to Barnegat Inlet. The study area lies in Ocean County and consists of a barrier spit that is connected to the mainland at the northern end and extends to the south. The feasibility study evaluated various alternative plans to provide hurricane and storm damage reduction benefits. The study area is vulnerable to storm erosion, wave, and inundation damage produced by hurricanes and northeasters. Severe storms in recent years have continued to erode the beaches and have exposed communities to potential for catastrophic coastal erosion and flooding damages. Two reaches were delineated within the study area and evaluated separately for proposed solutions. The southern reach extends approximately 10 miles from Barnegat Inlet northward to Berkeley Township and encompasses Island Beach State Park. No action is recommended for this reach, based on minimal storm damage reduction benefits and State agencies’ desires to preserve this area as a natural setting with no direct intervention to control beach processes. The northern reach extends approximately 14 miles from Berkeley Township northward to Point Pleasant Beach at Manasquan Inlet with oceanfront that is essentially fully developed. The selected plan for this reach consists of berm and dune restoration using sand obtained from offshore borrow sources. The design dune crest has a top elevation of +22 ft NAVD at all areas except Seaside Heights and northern Point Pleasant Beach, where the design dune crest elevation is +18 ft NAVD. The design berm extends 75 ft in front of the dune except at Seaside Heights and northern Point Pleasant Beach, where the design berm width is 100 ft. The design berm crest elevation corresponds to the average existing berm elevation, which is +8.5 ft NAVD at all Executive Summary ES-2 Manasquan Inlet to Barnegat Inlet Final Feasibility Report areas except northern Point Pleasant Beach where the natural berm crest transitions to +11.5 ft NAVD due to influence of the Manasquan Inlet south jetty. The proposed project extends approximately 14 miles. The selected beach fill plan tapers to the existing beach width at the southern end of the project, adjacent to Island Beach State Park. The northern end of selected plan terminates at the Manasquan Inlet south jetty, with no taper. Initial sand quantity is estimated at 10,689,000 cu yds and includes design fill quantity, advanced fill, and overfill. Periodic nourishment quantity is estimated at 961,000 cu yds on a 4-year nourishment cycle. Identified borrow areas contain approximately 17.5 million cu yds for initial construction and approximately 6 nourishment cycles (through year 24). Additional borrow sites may be required for subsequent nourishment cycles, assuming no future infilling of the identified borrow areas. Alternate borrow sites to provide the remaining quantity will be identified in an off-shore area beyond the three-mile limit. Investigations during the Preconstruction, Engineering, and Design (PED) phase will identify the specific sites to be used. A Section 404(b)(1) evaluation has been prepared and is included in this Feasibility Report and Environmental Impact Statement. This evaluation concludes that the proposed action would not result in any significant environmental impacts relative to the areas of concern under Section 404 of the Federal Clean Water Act. The selected plan has primary output based on hurricane and storm damage reduction. The plan provides average annual net benefits of approximately $5,350,000 and a benefit-to-cost ratio of 1.9. The total initial project construction cost is estimated at $58,223,000 (September 2000 price level) and would be cost-shared 65% Federal, 35% non-Federal. The Federal share of this first cost is $37,845,000 and the non-Federal share is $20,378,000. Lands, Easements, Rights-of Ways, Relocations, and Dredged Material Disposal Areas (LERRD) costs are estimated at $3,691,000 and will be credited towards the Non-Federal Sponsor’s cash contribution. Periodic nourishment is expected to occur at 4-year intervals subsequent to completion of initial construction (year 0). Over 50 years, total periodic nourishment cost is estimated at $96,920,000 (September 2000 price level) and includes E&D monitoring during construction. Based on the Water Resources Development Act (WRDA) of 1999, cost sharing for periodic nourishment would be 50% Federal and 50% non-Federal for sand placement costs and 100% non-Federal for major replacement of dune grass, sand fence, and crossovers. The ultimate cost of construction which includes initial construction, project monitoring, and 50 years of periodic nourishment is estimated to be $155,143,000 (September 2000 price level), cost-shared 54% Federal and 46% non-Federal, based on WRDA 1999 cost-sharing. All costs include planning, engineering, and design. Operation, Maintenance, Repair, Replacement, and Rehabilitation (OMRR&R), estimated at $100,000 annually, is not included in this cost and is a non-Federal responsibility. Executive Summary ES-3 Manasquan Inlet to Barnegat Inlet Final Feasibility Report N E W Manasquan Inlet Extent of # Study Area Point Pleasant Beach J E R S E Y # Bay Head ± S T # I Mantoloking M I L T N Brick Township C E J Dover Township O R P D E S # 37 Lavallette O P O #Seaside Heights R P± # Seaside Park Y Berkeley Township A W Y K R A A P B T A Island Beach E G T State Park A E T S N R A N B E