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https://hdl.handle.net/11681/26912| Title: | Environmental Assessment : Continued Operations and Maintenance Dredging Placement of Dredged Material on Dade County Beach Erosion Control Project, Intracoastal Waterway, Cut DA-9 at Bakers Haulover Inlet, Miami-Dade County, Florida : Appendix B, Seagrass Surveys |
| Authors: | United States. Army. Corps of Engineers. Jacksonville District |
| Keywords: | Dredging Dredging spoil Beach erosion Beach nourishment Miami-Dade County (Fla.) |
| Publisher: | United States. Army. Corps of Engineers. Jacksonville District. |
| Abstract: | This report is submitted as a final report for the fulfillment of Agreement #ICW-DA-13-02 by and between the Florida Inland Navigation District (FIND) Miami-Dade County, through its Department of Regulatory and Economic Resources - Environmental Resources Management (DERM) for services associated with identification, description and mapping of benthic resources inside Bakers Haulover Inlet, and specifically within the work area proposed for Inter-Coastal Waterway (IWW) maintenance dredging. The Scope of Work (SOW) for the Agreement was developed to meet specific conditions of the State of Florida‟s Department of Environmental Protection project related permit (No. 0173188-002-JC, with modifications). The SOW required identification and description of seagrasses and other benthic resources found within the defined work area (i.e., 150 meter turbidity mixing zone surrounding the area of the planned dredging area and the anticipated pipeline corridor. These resources included algae, sponges, soft corals, and hard corals. Pre-construction biological assessments within the mixing zone and pipeline corridor were conducted from August 13th to September 6th, 2013. Methodologies utilized for seagrass surveys were consistent with NOAA‟s National Marine Fisheries “Recommendations for Sampling Halophila johnsonii at a Project Site” guidance document (http://sero.nmfs.noaa.gov/pr/docs/JSG%20Survey%20Guidelines.pdf) as well as the survey methodology to define and quantify approximate seagrass and benthic resources abundance used by DERM during the 2010 surveys conducted for the prior IWW maintenance dredging. Seagrass areas were traced by a diver using a Garmin GPSMAP 76 device. The traces were downloaded using GPS Trackmaker® software, and subsequently imported into a GIS program (ArcGIS®) to produce the maps contained herein. All GIS shape files (NAD83) created during the mapping process and pre-construction survey information were provided to FIND prior to commencement of dredging on a CD submitted with the Pre-Construction Report in January 13th, 2014. The maintenance dredging began in March of 2014 and concluded with the final bathymetric survey. The interim survey was conducted during dredging operations, on March 26, 2014. The methodology for this survey included vessel based inspections within the 150 m previously defined mixing zone and in-water survey inspections of the submerged pipeline with random checks within the immediate dredging and mixing-zone area. During this survey, there was no indication of damage to the benthic resources were observed. |
| Description: | Environmental Assessment |
| Rights: | Approved for Public Release; Distribution is Unlimited |
| URI: | http://hdl.handle.net/11681/26912 |
| Appears in Collections: | Environmental Documents |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| EA_Dredging Maintenance_Baker Haulover Inlet App B_2017.pdf | 156.3 MB | Adobe PDF |  View/Open |