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HomeMy Public PortalAbout1997 Engineering Services re to Development of Comprehensive Beach Management Plan" COASTAL COASTAL SYSTEMS INTERNATIONAL, INC. 464 South Dixie Highway " Coral Gables, Florida 33146 Tel: 305/661-3655 " Fax:305/661-1914 135020 SYSTEMS January 9, 1997 INTERNATIONAL Mr. C. Samuel Kissinger Village Manager VILLAGE OF KEY BISCAYNE 85 West McIntyre Street Key Biscayne, Florida 33149 RE: ENGINEERING SERVICES RELATIVE To DEVELOPMENT OF COMPREHENSIVE BEACH MANAGEMENT PLAN FOR THE VILLAGE OF KEY BISCAYNE, DADE COUNTY, FLORIDA. Dear Mr. Kissinger: Pursuant to the request of the Village Beach Resources and Management Task Force, this is to submit the proposal for development of a Comprehensive Beach Management Plan for The Village of Key Biscayne that would expand the study scope of our previously proposed 50 -year beach management plan. Please note that the previously proposed 50 -year beach management plan focuses on the needs of the Village of Key Biscayne for future beach renourishments within the next 50 years. The currently proposed Comprehensive Beach Management Plan will add additional plan components to the 50 -year plan including understanding of the regional coastal processes south of Government Cut, identification of the economic and environmental benefits associated with the beach renourishment projects, and development of a hurricane emergency plan for beach restoration after a storm event. The following is the proposed agreement for engineering services to be provided by Coastal Systems International, Inc. (Coastal Systems) for the Village of Key Biscayne (the Village). PART I - REGIONAL COASTAL PROCESSES Coastal Systems will perform a coastal engineering evaluation for the region between Government Cut and the island of Key Biscayne (Key Biscayne). In addition to the previously proposed 50 -year management plan, Coastal Systems will collect and review historic shoreline and beach profile data along the Atlantic coastline of Fisher Island and Virginia Key to assess the beach conditions subsequent to the opening of Government Cut in 1904. Historic beach improvements on these two barrier islands will also be evaluated towards assessing the performance of the beaches. Historic bathymetric surveys, nautical charts, aerial photographs, and other related information will be collected and reviewed to assess the alteration of the flood and ebb tidal shoals in Norris Cut and Bear Cut subsequent to the opening of Government Cut. Natural sand movement across these two Cuts will be evaluated, and the growth of the ebb and flood tidal shoals will be estimated. Coastal, Environmental, Civil, Engineering and Management " 135020 Mr. Sam Kissinger January 8, 1997 Page 2 Formation of the offshore sand ridge at northern Key Biscayne in relationship to the Bear Cut channel will be evaluated. Based on the understanding of the regional coastal processes and sand movement, impacts associated with the opening of Government Cut on the downdrift beaches and cuts will be assessed. A regional sand movement within the region extending from Government Cut south to Key Biscayne will be presented. Understanding of the impacts of Government Cut on the downdrift beaches may provide justification for the Village in obtaining the permitting and funding approval from the State and Federal agencies for implementation of the beach renourishment projects. PART II - ECONOMIC AND ENVIRONMENTAL BENEFITS Coastal Systems will identify the economic and environmental benefits associated with the beach renourishment projects along the Village beach. Specifically, Coastal Systems will perform an economic analysis to determine the recreational and storm protection benefits associated with the proposed beach renourishment project. Coastal Systems will collect and review the data relative to the revenue generated by tourism in Key Biscayne and the property value of hotels and condominiums fronting the Atlantic Ocean. Coastal Systems will use the standard method adopted by the U.S. Army Corps of Engineers to calculate the recreational and storm protection benefits for the proposed beach renourishment project. A benefit and cost ratio will be calculated for the beach project and used for application of Federal and State funding. In developing the storm protection benefits, Coastal Systems will use a computer model to predict the storm erosion beach profile along the Village beach under a 100 - year storm event with input of a storm hydrograph for the beach conditions with and without a beach renourishment project. Cost associated with the predicted building damages without the beach fill under a 100 -year storm event will be estimated toward determining the storm protect benefits associated with beach renourishment. The environmental benefits associated with beach renourishment projects in preserving a healthy beach for sea turtle nesting and increasing living quality for the Village residents will also be discussed. PART III - HURRICANE EMERGENCY PLAN Coastal Systems will analyze historic storm events and identify the frequency of occurrence of a storm or hurricane that may affect the Key Biscayne beach. Coastal Systems will assist the Village in developing a hurricane emergency plan for beach restoration subsequent to a storm event. This emergency plan will specify the actions to be taken relative to beach renourishment and recovery in the event of severe beach erosion. The specific components of this emergency plan are described in the following: a) Frequency of Storm: Coastal Systems will collect and review the data of historic storm and hurricane events occurring within a 50 -mile diameter of Key Biscayne. The frequency of occurrence of a storm or hurricane that would affect Key Biscayne will be determined based on the historic data. The storm surge associated with a 100 -year storm COASTAL SYSTEMS INTERNATIONAL, INC. " Coastal, Environmental, Civil Engineering and Management " 135020 Mr. Sam Kissinger January 8, 1997 Page 3 event at Key Biscayne will be determined and utilized later for prediction of storm erosion. Impacts associated with a hurricane such as Andrew on the Key Biscayne beach will be investigated using the post -storm survey data. The path of historic storm events passing through Key Biscayne and its vicinity will be graphically presented. b) Hurricane Emergency Plan: Coastal Systems will coordinate with the Village to develop a hurricane emergency plan that would allow actions to be taken immediately after a storm or hurricane event. This emergency plan will identify the procedure and requirements involved to restore the eroding beach, and to secure necessary emergency permit and funding for beach restoration and recovery subsequent to severe erosion. Specifically, the emergency beach restoration will include engineering assessment of beach erosion, hydrographic survey, engineering design, emergency beach fill application and processing, emergency beach restoration funding application and processing, sand source alternatives, securing a marine contractor to implement the beach fill project. PART IV - COMPREHENSIVE BEACH MANAGEMENT PLAN Coastal Systems will prepare a Comprehensive Beach Management Plan report for the Village that would incorporate the above identified information into the 50 -year beach management plan. Specifically, this Comprehensive Plan report will include an emergency plan associated with a storm event, identify the recreational and storm protection benefits associated with a beach renourishment project, identify the benefit/cost ratio of the beach project, and describe regional coastal processes from Government Cut south to Key Biscayne. The impacts of Government Cut opening on the downdrift beaches will be identified. In addition, this plan will also explore the potential short and long term local funding sources such as tolls, taxes, fees etc. Specific economic and environmental benefits associated with the beach renourishment project will also be identified. This plan will also include evaluation of viable beach maintenance alternatives, the Village proposed dune landscaping and beach walk plan, as well as public education. Coastal Systems will coordinate with the Village officials, local experts and landscaping architect consultants in reviewing and incorporating these plan elements into the Comprehensive Beach Management Plan. Specifically, Coastal Systems will work with the Village officials toward selecting an optimum and practical beach maintenance plan that is suitable for the Village beach. The Village proposed dune landscaping and beach walkway plan will be evaluated and incorporated into the Village Comprehensive Beach Management Plan. The plan will also provide recommendations for public education on the importance of beach management. COASTAL SYSTEMS INTERNATIONAL, INC. " Coastal, Environmental, Civil Engineering and Management ' 135020 Mr. Sam Kissinger January 8, 1997 Page 4 GENERAL Fees: Coastal Systems will invoice the Village for Parts I through IV services on a percentage complete basis for the fees identified herein. Expenses, report preparation and costs relative to travel and accommodations will be invoiced separately pursuant to the Rate Schedule identified in our current agreement with Dade County. Invoices will be submitted by the 15th of each month for the previous month's work. Invoices are to be paid within 30 days of receipt of the invoice by the Village. Invoices not paid after 30 days and not in dispute will incur interest at a rate of 1.5 percent per month. We look forward to working with you towards developing a successful Comprehensive Beach Management Plan for the Village of Key Biscayne. Please return a signed copy of this agreement to us which will serve as our Authorization to Proceed. Should you have any questions or require any additional information, please do not hesitate to contact me. Sincerely, COAfr 1L SYSTEMS INTERNATIONAL, INC. Paul C.-P.\Lin, Ph.D., P.E. Associate SIGNED: DATE: Mr. Samuel Kissinger, Village Manager Village of Key Biscayne PL:jrc Attachment cc: James Decocq, Village of Key Biscayne R. Harvey Sasso, P.E., Coastal Systems \\Fs1\sys\PROJECT\135020\CorrespondenceAS (97-1-6) LTR Sam Kissinger doc COASTAL SYSTEMS INTERNATIONAL, INC. • Coastal, Environmental, Civil Engineering and Management 135020 . COST ESTIMATE FOR COMPREHENSIVE BEACH MANAGEMENT PLAN VILLAGE OF KEY BISCAYNE, DADE COUNTY DESCRIPTION Engineering Fees Expenses Total I. REGIONAL COASTAL PROCESSES $13,900 $500 $14,400 II. ECONOMIC AND ENVIRONMENTAL BENEFITS $20,600 $800 111. HURRICANE EMERGENCY PLAN $18,800 $300 IV. COMPREHENSIVE BEACH MANAGEMENT PLAN $23,400 $1,200 $21,400 $19,100 $24,600 TOTAL $76,700 $2,800 $79,500 GRAND TOTAL $79,500 f: project11350101coastallS (97-1-8) Cost Estimate Sam Kissinger 1/9/97