02/02/2021 - Laserfiche WebLink

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I' DEPARTMENTAL 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: Sector 3 - Phase 1 Beach and Dune Restoration Project (IRC -1925) Additional Erosion Observed Since Summer 2020 Survey DATE: January 25, 2021 DESCRIPTION AND CONDITIONS On December 1, 2020, the Indian River County Board of County Commissioners approved staff's recommended Award of Bid No. 2021012 for constructing Phase 1 of the Sector 3 Beach and Dune Restoration Project. Phase 1 of Sector 3 consists of restoring the beach and dune on the northern 3.7 mile stretch of Sector 3 (Wabasso Beach Park north to the Seaway sub -division). Engineer's estimated at the time of bidding and award that the project would entail the placement of approximately 307,000 cubic yards (cy) of beach compatible sand and approximately 200,710 native dune plantings. Indian River County has semi-annual beach surveys performed as recommended in the County's Beach Preservation Plan. These county -wide surveys are used to monitor the seasonal (summer and winter) fluctuations of the beach. Bid No. 2012012 incorporated the most recent surveys available (Summer 2020) when determining the estimated volumes of sand needed for the restoration project (307,000 cubic yards). In accordance with the awarded contract for Phase 1 of the Sector 3 Beach and Dune Restoration project, the contractor (Guettler Brothers Construction, LLC.) is required to perform pre and post - construction surveys. These surveys are used in the determination of sand volumes placed within the permitted fill templates as the conditions exist in the field at the time of construction. The pre -construction surveys performed (late December/early January) have been evaluated by the contractor, the Engineer of Record for the project (APTIM, LLC), and County staff. The pre - construction surveys identified additional erosion being observed over the past 6 months, since the routine Summer 2020 surveys were performed, which in turn increased the quantity of sand required to fill the designed beach templates. County staff perform visual observations of the beach and dune conditions throughout the County's 22.4 mile stretch of coastline, with a focus on documenting conditions during periods of significant erosion, such as the passing of tropical and nor'easterly storms. Since the Summer 2020 surveys, the County has experienced erosional events from Tropical Storm Isaias (August 2020), 205