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)>t APTIM June 17, 2025 (Revised) Mr. Eric Charest Indian River County Public Works - Coastal Division 1801 27th St, Building A Vero Beach, FL 32960 Subject: Indian River County, FL Sector 3 — 2018006 — Work Order #21 Sector 3 Hardbottom Impact Analysis Dear Eric: A TRUE COPY CERTIFICATION ON LAST PAGE RYAN L. BUTLER, CLERK 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 This proposal outlines a scope of work for Aptim Environmental & Infrastructure, LLC (APTIM), to provide professional services to Indian River County (the County) in support of the Sector 3 Beach and Dune Restoration Project. The scope of work described herein is to support the County with a hardbottom impact analysis to explore the feasibility of increased fill templates along portions of the Sector 3 shoreline. The tasks to perform this work are listed below and described on the following pages. A breakdown of the hours and expenses to develop the cost is attached. The scope and fee proposal were developed following the provisions of the Professional Services Agreement between Indian River County and APTIM, dated January 9, 2018, to provide engineering and biological support services in support of the Sector 3 (Wabasso Beach) Beach and Dune Restoration Project (RFQ#2018006). Task 1: Profile Analysis APTIM will analyze historic beach profile and hardbottom monitoring area to determine candidate areas for increased fill density. APTIM proposes the following services as components of this study: • Determine candidate profiles for increased fill (erosion rates, hardbottom location, etc.) • Develop preliminary fill templates • Develop equilibrium profiles • Plot seaward limit of fill and perform impact analysis • Finalize beach fill template • Modeling of increased fill densities The monitoring data will be used to demonstrate fill areas best suited for increased fill templates within the Sector 3 Project Area. This will provide a degree of additional storm protection and allow for less frequent renourishment episodes. Previous nourishment projects had relatively thin fill sections, primarily to avoid hardbottom coverage using a method acceptable to FDEP. Thinner fill sections are subject higher loss rates by percentage. A wider and higher beach will moderate these loses, increasing the project durability. In addition, the biological monitoring study has not shown any significant reef impacts attributable to the past projects. Conclusions of this study will support the supposition that a wider and higher beach.