02/15/2022 (4) - Laserfiche WebLink

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Task 1A: Scope of Work 1) Hardbottom Edge Mapping: APTIM shall map the position of the nearshore hardbottom edge for the Phase 1 Sector 3 project area, including 1000 feet north (updrift), from R-19.5 to R-40, for a length of approximately 3.8 miles. A buoy with a Differential Global Positioning System (DGPS) antenna linked to a topside laptop computer running HYPACK navigational software will be towed by divers to record the position of the nearshore hardbottom edge. The divers will follow the inshore contour of the most prominent hardbottom-sand interface. The purpose of the survey is to provide a comparison for pre- and all subsequent post -construction edge delineations. 2) Monitoring Permanent Transects: Thirty (38) permanent transects were established along the length of project influence, which includes 1000 feet north (updrift) and 2000 feet south (downdrift). This includes twenty-four (24) biological monitoring transects and fourteen (14) sediment -only transects. Phase 1 monitoring shall be conducted from R-20 to R-40 and will include twenty-two (22) permanent transects (15 biological and 7 sediment - only). All transects were established perpendicular to the shoreline and extend from the landward hardbottom edge to a maximum distance of 50 meters seaward. APTIM will conduct the biological survey of the hardbottom using the following methods: 1) Quadrat Assessments: Up to nine (9) 0.5-m' quadrats sampled along each transect to quantify the benthic community. 2) Sediment Measurements: Collected using line -intercept and 1-m interval sediment depth measurements. 3) Video/Photo Documentation: Collected for the length of each transect. It is anticipated that the effort to delineate the hardbottom edge and monitor the transects will take up to twelve (12) field days based on previous monitoring events. The data will be compiled and incorporated into a GIS database and in situ data will be entered into an Access database. Time to complete data entry, reduction, analyses, and report production is included in the cost estimate to address the data management and reporting requirements for those 12 days of field operations. Task 1A: Deliverable Raw data will be provided to FDEP and the County including a PDF of the scanned datasheets, excel spreadsheets with quadrat data, interval sediment depth measurements and line -intercept data, shapefiles of the hardbottom edge survey, video/photo documentation. Additionally, APTIM will provide a map of the project area and adjacent hardbottom resources with the hardbottom edge delineation and monitoring transects overlaid onto the most recent aerial photography (in digital format). A post -construction biological monitoring report will be generated for submittal to the County and regulatory agencies. Task 1A: Schedule 133