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