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9.A,Cra INDIAN RIVER COUNTY, FLORIDA MEMORANDUM TO: Jason E. Brown, County Administrator THROUGH: Richard B. Szpyrka, P.E., Public Works Director FROM: Eric Charest, Natural Resources Manager SUBJECT: Shoreline Performance Modeling, APTIM Work Order No. 2018008-04 DATE: September 1, 2022 DESCRIPTION AND CONDITIONS Indian River County staff have been participating on the Sebastian Inlet Technical Advisory Committee (TAC) since it was convened by the Florida Department of Environmental Protection (FDEP) in January 2022. This TAC was established to allow for key stakeholder groups and professionals to utilize the most recent scientific information available in order to provide technical expertise and feedback to the FDEP for decision making with regards to updates to Sebastian Inlet District's Inlet Management Implementation Plan (IMP). Approved in 2000, the current Sebastian Inlet IMP defined strategies to best manage sand bypassing activities for the placement of beach quality sand on the adjacent eroding beaches of inlet. The intent of the IMP strategies was to replicate the natural drift of sand that has been interrupted or altered by an inlet, so that all reasonable efforts to maximize inlet sand bypassing would be designed to balance the sediment budget of an inlet, consistent with Section 161.142 Florida Statutes. As approved on November 9, 2021 by the Board of County Commissioners (BCC), Indian River County has been utilizing the expertise of APTIM Environmental and Infrastructure LLC (APTIM) to assist the County on this TAC. Work performed to date by APTIM under Work Order #2018008-3, and subsequent Amendment #1, has provided specific information regarding the dynamic nature of Indian River County beaches over a defined period of time. This data, as well as additional information brought before the TAC by stakeholders, is intended to provide the basis for the FDEP's recommendations for an updated Sebastian Inlet District IMP. During the most recent TAC meeting on August 24, 2022, TAC Meeting # 3, questions were raised over an apparent deficit of sand in the Indian River County coastal system and the potential impacts that causes on the County beaches. In order to identify any impacts, advanced modeling of shoreline performance of the County's coastline is required. As this effort is beyond the current scope of Work Order #2018008-3 with APTIM, staff is seeking BCC approval of APTIM proposed Work Order #2018008-4 to provide the County and TAC with the results from such a modeling effort. Under an April 17, 2018 BCC approved the Continuing Contract Agreement for Continuing Engineering Services, renewed on May 18, 2021 for a two (2) year extension, APTIM has been providing the County with various coastal engineering support services, such as their efforts on this TAC. 399