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NOAA Form 76-35AU.S. Department of CommerceNational Oceanic and Atmospheric AdministrationNational Ocean SurveyD00240DESCRIPTIVE REPORTType of Survey:ResponseRegistry Number:D00240LOCALITYState:VirginiaGeneral Locality:Southern Chesapeake BaySub-locality:York Spit Channel2017CHIEF OF PARTYLTJG Sarah L. ChappelLIBRARY & ARCHIVESDate:
NOAA FORM 77-28(11-72)U.S. DEPARTMENT OF COMMERCENATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATIONHYDROGRAPHIC TITLE SHEETINSTRUCTIONS:REGISTRY NUMBER:D00240The Hydrographic Sheet should be accompanied by this form, filled in as completely as possible, when the sheet is forwarded to the Office.State:VirginiaGeneral Locality:Southern Chesapeake BaySub-Locality:York Spit ChannelScale:1: 10,000Date of Survey:10/05/2017Instructions Dated:10/05/2017Project Number:S-E924-BH2-17Field Unit:NOAA R/V Bay Hydrographer IIChief of Party:LTJG Sarah L. ChappelSoundings by:Multibeam Echo SounderImagery by:Side Scan SonarVerification by:Pacific Hydrographic BranchSoundings Acquired in:metersH-Cell Compilation Units:N/ARemarks:The purpose of this survey was to respond to a USCG request for assistance locating a missing buoy. All separates arefiled with the hydrographic data. Any revisions to the Descriptive Report (DR) generated during office processing areshown in bold red italic text. The processing branch maintains the DR as a field unit product, therefore, all informationand recommendations within the body of the DR are considered preliminary unless otherwise noted. The finaldisposition of surveyed features is represented in the OCS nautical chart update products. All pertinent records for thissurvey, including the DR, are archived at the National Centers for Envitronmental Information (NCEI) and can beretrieved via http://www.ncei.noaa.gov/.
DESCRIPTIVE REPORT MEMOOctober 30, 2017MEMORANDUM FOR: Pacific Hydrographic BranchFROM:LTJG Sarah L ChappelOfficer in Charge, NOAA R/V BAY HYDRO IISUBJECT:Submission of Suvey D00240CHAPPEL.SARAH.LYNN.14726312722017.10.30 14:39:50-04'00'The purpose of this survey was to respond to a USCG request for assistance locating missing Buoy “3”. Itwas located north of Cape Henry at the entrance to Cape Henry Channel. A cruise ship struck the buoy andmay have dragged it north until it sank or came free from the ship. The Bay Hydro II was tasked to surveythe York Spit Channel from G"37" & R"38" gate down to R"20" and then down to north of Cape Henryto help assist in clearing the precautionary area . The survey limits and methods (i.e., sensors used) weredetermined by the OIC of the Bay Hydro II in consult with the NRB Chief and NOAA Navigation Manager.The data from this survey are not intended to meet NOAA charting specifications, and are not intended tobe applied to the nautical chart with the exception of hazards to navigation (i.e., DToNs), and potential antiDToNs subject to branch review.The field unit produced a survey outline, bathymetric grid, and associated SSS mosaics. These products aresubmitted with this report to the Pacific Hydrographic Branch.Soundings were reduced to Mean Lower Low Water (MLLW) using observed tides from Stations 8632200(Kiptopeke, Chesapeake Bay), 8637689 (Yorktown USCG Training Center, York R.), 8638610 (SewellsPoint, Hampton Roads), and 8638863 (Chesapeake Bay Bridge Tunnel).All survey systems and methods utilized during this survey were as described in S-E924-BH2-17 DAPR.There were no DTONs created for this survey.All data were acquired by a NOAA or NOAA Contractor field unitPer the Project Instructions, the field unit determined one ATON (Green "25"buoy) to be missing. Theteam confirmed with local authorities that the buoy was known to be absent from the charted station. Themultibeam surfaces show major heave and roll artifacts, due to poor weather conditions. These artifactsare more egregious in the MBES data east of the Chesapeake Bay Bridge Tunnel. The hydrographer postprocessed SBETs in an attempt to alleviate these artifacts, but was unsuccessful in doing so.This survey does not meet charting specifications and is not adequate to supersede prior data.
Survey data should be archived at NCEI and the DR memo forwarded to HSD.Metadata for Survey aLocalitySouthern Chesapeake BaySub-LocalityYork Spit ChannelScale of Survey1:10000Sonars UsedEdgetech 4200 Side Scan SonarKongsberg EM2040 Multibeam SonarHorizontal DatumNorth American Datum of 1983 (NAD83)Vertical DatumMean Lower Low WaterVertical Datum CorrectionVDatumProjectionUTM Zone 18NField UnitNOAA R/V BAY HYDRO IISurvey Dates10/05/2017Chief of PartyLTJG Sarah L. ChappelSubmission Date10/30/2017
APPROVAL PAGED00240Data did not meet current specifications as determined by the OCS survey acceptance reviewprocess. The survey did not meet specifications mainly due to major artifacts found in themultibeam and sidescan data. The survey will not be applied to NOAA charting products.The following products will be sent to NCEI for archive:- D00240 DR Memo.pdf- Processed survey data and records- D00240 GeoImage.pdfThe survey evaluation and verification has been conducted according to current OCSspecifications and procedures.Date: 2018.01.0909:56:09 -08'00'Approved:Toshi WozumiActing Hydrographic Team Lead, Pacific Hydrographic BranchThe survey has not been approved for chart updates. The data will be archived at NGDC so thatit can be made available for other uses.HAUSER.OLIVIA.A.127563 Digitally signed byHAUSER.OLIVIA.A.12756360096009Date: 2018.01.10 15:24:50 -08'00'Approved:LCDR Olivia Hauser, NOAAChief, Pacific Hydrographic Branch
All data were acquired by a NOAA or NOAA Contractor field unit Per the Project Instructions, the field unit determined one ATON (Green "25"buoy) to be missing. The team confirmed with local authorities that the buoy was known to be absent from the charted station. The
