Basic Hydrographic Survey 2020 W00670 Rhode Island Rhode Island Sound Orsted South Fork Wind Farm 20000 2020-05-26 2020-08-31 ESD-AHB-22 Orsted Chief of Party, MMT AB, contractor for Orsted Atlantic Hydrographic Branch meters Any revisions to the Descriptive Report (DR) applied during office processing are shown in red italic text. The DR is maintained as a field unit product, therefore all information and recommendations within this report are considered preliminary unless otherwise noted. The final disposition of survey data is represented in the NOAA nautical chart products. All pertinent records for this survey are archived at the National Centers for Environmental Information (NCEI) and can be retrieved via https://www.ncei.noaa.gov/. Products created during office processing were generated in NAD83 UTM 19N, MLLW. All references to other horizontal or vertical datums in this report are applicable to the processed hydrographic data provided by the field unit. North American Datum 1983 Mean Lower Low Water VDatum Projected UTM 19 2023-07-12 CC BY (External Source Data) CC-BY-4.0 https://creativecommons.org/licenses/by/4.0/ https://creativecommons.org/licenses/by/4.0/legalcode This data is licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0). Attribution is included in this report. 2023-07-07 Atlantic Hydrographic Branch Chief of Party Chief of Party MMT AB, contractor for Orsted AHB MMT AB were contracted by Orsted to conduct a geophysical survey on the lease area OCS-A 0486 in support of the South Fork Wind Farm (SFW01) site investigations. The SFW01 Site Area is located approximately 31 kilometres (km) southeast of Block Island, Rhode Island in Rhode Island Sound on the Atlantic Outer Continental Shelf (OCS). A 20cm resolution, tiled average gridded digital terrain model of the bathymetry in the survey area is provided. Integrate post-processed navigation (SBET) with MBES. Apply tidal correction to MLLW and apply sound velocity corrections. Verify that DTM surface meets Orsted standards in vertical and horizontal alignment. Clean data and verify that outliers have been rejected in line with Orsted standards, export average 20cm surface DTM. No Data Acquisition and Processing Report provided by the field unit. All data were reviewed for DTONs and none were identified in this survey. MMT AB, contractor for Orsted This survey does meet charting specifications and is adequate to supersede prior data.