2019-128 - Laserfiche WebLink

Home Browse Search

Indian River County Work Order Number 2018007-3 Sector 7 Beach and Dune Restoration Project Exhibit 1 - Scope of Work 1.3 Reconnaissance Diver Survey: CSA will monitor and note field conditions in the Project area daily following a notice to proceed until fieldwork is completed. Field conditions of note will include wind direction and speed, wave height, wave period, and water clarity (underwater visibility), as applicable, along with any significant weather conditions. Wave heights greater than 0.6 m typically result in increased turbidity and reduced underwater visibility, which prevents surveys from being conducted. During appropriate field conditions, CSA will perform the following: (a) Hardbottom Edge: CSA divers will use the diver positioning system to delineate portions of the nearshore hardbottom edge within the Project area and seaward of the 2007 permitted ETOF, and also within areas 300 m updrift and 900 m downdrift of the Project area, from FDEP Monuments R-97 to R-111. As the hardbottom edge is mapped, its relief characteristics will be recorded as: low (>0.3 m), medium (0.3 m to 1 m), or high (>1 m) relief. Results from this mapping will be compared to the most recent geo-rectified aerial imagery and side -scan sonar survey and will be used to verify the distance from both the shore and the 2007 permitted ETOF seaward to the hardbottom edge. (b) Pipeline corridor: CSA divers will use the diver positioning system and bounce dives to verify the distribution of potential hardbottom within the proposed pipeline corridor. Any hardbottom observed within the pipeline corridor will be delineated. (c) CSA divers will gather observations and measurements about the hardbottom relief, substratum type, sediment cover, and biological community composition and distribution within the Project area. CSA will use temporary transects to survey the Project area. Temporary transects will be approximately 30m in length. An estimated 30 cross -shore temporary transects, beginning at the landward edge of hardbottom located seaward of the 2007 permitted ETOF and extending directly offshore between FDEP Monuments R- 97 and R-111, will be surveyed during the 2019 survey. Divers will collect qualitative video to document the seafloor and associated biota along each transect. A survey of the proposed pipeline corridor will also be conducted to verify the absence of hardbottom in this area. If any hardbottom is observed, it will be qualitatively assessed in the same manner as previously described. 1.4 Data Analysis and Reporting: Findings from the Task 1.2 desktop analysis and the Task 1.3 in situ survey will be summarized provided by CSA in a habitat characterization report and as a habitat characterization map. The habitat characterization map will be (a) based on the preliminary desktop work and the reconnaissance and side scan surveys, and (b) will be supplied as a collection of shapefiles. The habitat characterization report will be based on the data gathered during the surveys and the data presented in the habitat characterization map. The report will include methods, results, and discussions regarding hardbottom habitat, community types, and locations within the project area. The habitat characterization report will include figures documenting the survey transect positions with the location of hardbottom and substrate types along each survey line, qualitative survey video, digital images, and drawing files showing transect locations and substrate type in ArcView format. The habitat characterization map will be provided as a collection of shapefiles. Page 2 of 2 July 31, 2019