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)>16 <br />APTIM <br />September 2, 2022 <br />Eric Charest <br />Coastal Division <br />Indian River County Public Works <br />1801 27th Street <br />Vero Beach, FL 32960 <br />Subject: Indian River County, FL <br />Work Order 2018008-04 <br />Dear Eric: <br />Aptim Environmental & Infrastructure, LLC <br />6401 Congress Avenue, Suite 140 <br />Boca Raton, FL 33487 <br />Tel: +1 561 391 8102 <br />Fax: +1 561 391 9116 <br />www.aptim.com <br />Sebastian Inlet Technical Advisory Committee Numerical Modeling Analysis <br />This proposal outlines a scope of work for Aptim Environmental & Infrastructure, LLC (APTIM) to provide <br />numerical modeling assistance to the County for the final Technical Advisory Committee (TAC) meeting <br />for the Sebastian Inlet. <br />Scope of Work <br />In order to better understand shoreline performance for historic and proposed bypassing amounts at <br />Sebastian Inlet, APTIM will perform numerical modeling to analyze coastal processes in the vicinity of <br />the inlet and propose beach management strategies to the TAC. APTIM will develop a numerical model <br />for Indian River County that can model the complex interactions between offshore bathymetry, waves, <br />tides, winds, currents, sediment transport, erosion, and deposition. <br />The modeling effort will make best use of existing bathymetry and topography, LiDAR data, water levels, <br />waves, winds and sediment data to simulate the physical processes that influence Indian River County <br />and its surrounding areas. Beach profile data from of the annual monitoring surveys of Indian River <br />County will be used for the beach portions of the study area. <br />APTIM will model four (4) fill scenarios to evaluate the potential effects of various bypassing scenarios <br />along the adjacent beaches. The model scenarios will be evaluated for short term (one year) and long <br />term (five years) simulation periods. Each modeled alternative will be compared to a baseline condition <br />in order to draw conclusions on the expected result of implementing each scenario. The model results <br />will be reviewed and presented to the TAC. <br />Deliverable <br />A memorandum overviewing the results of numerical modeling analysis will be provided to the County <br />for presentation to the TAC. <br />Schedule & Assumptions <br />APTIM will proceed with the task described herein upon receipt of a signed Work Order from Indian <br />River County. It is estimated that the modeling efforts will require 2 months from receipt of the signed <br />work order. <br />