Raw backscatter data is logged as .all file for delivery to NOAA's Pacific Hydrographic Branch. NOAA's Navigation Response Branch field units are waived from producing backscatter mosaics for the 2019 field season. All equipment and survey methods were used as detailed in the DAPR.There were no conditions or deficiencies that affected equipment operational effectiveness.None ExistAll equipment and survey methods were used as detailed in the DAPR.Multibeam crosslines were collected by S3006 across a variety of depth ranges, water masses, and survey dates with good spacial distribution. Crosslines were collected, processed and compared in accordance with Section 5.2.4.2 of the HSSD (Figure 11). A Variable Resolution (VR) surface was created of only mainscheme lines, and a second VR surface was created of only crosslines. A difference surface was generated in Pydro Explorers Compare Grids tool by subtracting the crossline only surface from the mainscheme surface (mainscheme- crosslines= difference surface). From the difference surface, the following statistics were derived. The mainshceme only, crossline only, and difference surface are included in the submission of this survey as Digital Data. For the respective depths, the difference surface was compared to the allowable NOAA uncertainty standards. Statistics show the mean difference between the depths derived from mainscheme data and crossline data was 0.1 meters, with mainscheme being shoaler/deeper. In total, 99.5% of the total number of nodes pass the TVUmax test between F00788 mainscheme and crossline data (Figure 13-14). The coloring represents areas where the TVUmax error tolerance in exceeded; red, orange and yellow colors represent areas where mainscheme data is deeper than crossline data; the blue shades represent where crossline data is deeper than mainscheme data (Figure 12). The analysis was performed on F00788 MBES data reduced to Mean Lower Low Water (MLLW) using Ellipsoidally Referenced Survey (ERS) methods.SupportFiles\F00788_XL_overview.pngF00788 crossline surface overlaid on mainscheme tracklines showing good temporal and geographic distribution. SupportFiles\F00788_xl_frac.pngDepth differences between F00788 mainscheme and crossline data as compared to NOAA allowable uncertainty standards for the associated depths. SupportFiles\F00788_MB_VR_MLLW_MS-F00788_MB_VR_MLLW_XL_depth_delta.pngThe statistic distribution summary plot of the difference between F00788 mainscheme and crossline data. SupportFiles\F00788_MB_VR_MLLW_MS-F00788_MB_VR_MLLW_XL_fracAllowErr_vsDepth.pngThe depth dependent plot of the Allowable Error Fraction, with values between and including +/-1 representing passing comparisons. Sonar system quality control checks were conducted as detailed in the quality control section of the DAPR.At least once every four hours with sufficient frequency, density, depth and accuracy as outlined in section 5.2.3.3 of the 2018 HSSD.SupportFiles\F00788_svp_location.pngF00788 sound speed cast locationsSound Velocity Profiles (SVP) casts were taken at least once every four hours in the deepest water nearest to the survey area being worked on (Figure 16). The SVP casts were applied to the MBES lines in CARIS using the "nearest in distance within time of 4 hours" method.Total Propagated Uncertainty (TPU) values for F00788 were derived from a combination of fixed values for equipment and vessel characteristics, as well as field assigned values for sound speed uncertainties. The uncertainty for the VDatum model was provided to the field unit in the project instructions. A visual inspection of the Uncertainty layer revealed the areas of higher uncertainty occurred in the outer beams, shifting bottom types, and deeper areas. In addition to the usual a priori estimates of uncertainty provided via device models for vessel motion, ERS, real time and post processed uncertainty sources were also incorporated into the depth estimates of F00788. Real-time uncertainties from the Kongsberg 2040C MBES sonars were incorporated and applied during post processing. Uncertainties associated with vessel roll, gyro, and navigation were applied real-time. F00788 utilized kinematic (RTK) positioning service. The recorded delayed heave Applanix files included an estimate of the heave uncertainty and were applied during post processing. All of the aforementioned uncertainties were applied in CARIS. F00788 is an ellipsoidally referenced survey (ERS) and the tidal component was accomplished via separation model. Additional information about RTK and the separation model are located in Section C.1 and C.2 of this report. The surface was analyzed using the HydrOffice QC Tools Grid QA feature to determine compliance with specifications. Overall, 99.5+% of nodes within the surface meet NOAA Allowable Uncertainty specifications for F00788 (Figure 15). 0.0S30061.00.150.09.5ERS via VDATUM0.0SupportFiles\F00788_MB_VR_MLLW_Final.QAv5.tvu_qc.pngPydro derived histogram plot showing HSSD uncertainty standards compliance for F00788 finalize VR surface. There were no other factors that affected corrections to soundings.None Exist11.1.6CARIS HIPS and SIPsTeledyneCaris_Support_Files_2019v1SupportFiles\Flier_1.pngExample of a flier identified by QC tools over a rocky, kelp ridden shoreline. The survey was carried out to meet the Object Detection MBES Coverage requirements as defined by Section 5.2.2 of the 2019 Hydrographic Survey Specifications and Deliverables. QC Tools in Pydro Explorer was used to analyze the surfaces for fliers. There were 3 fliers identified on the finalized surface. Upon review, they were found to be primarily at the steep and rocky shoreline edges of the survey area (Figure 17). Object Detection1.668.5F00788_MB_VR_MLLWCARIS VR Surface (CUBE)Variable ResolutionNOAA_VRObject Detection1.868.5F00788_MB_VR_MLLW_FinalCARIS VR Surface (CUBE)Variable ResolutionNOAA_VRThe equipment listed above was used to collect all data on F00788. EM 2040CKongsberg MaritimeMBESPOS MV 320 v5ApplanixPositioning and Attitude SystemMicroX SVAML OceanographicSound Speed SystemCastAway-CTDYSIConductivity, Temperature, and Depth SensorSupportFiles\S3006.PNGNRT-Seattle, S3006S3006 is an aluminum survey boat built by Lake Assault Boats in Superior, WI (Figure 10).434S3006Refer to the Data Acquisition and Processing Report (DAPR) for a complete description of data acquisition and processing systems, survey vessels, quality control procedures and data processing methods. Additional information to supplement sounding and survey data, and any deviations from the DAPR are discussed in the following sections.All sounding systems were calibrated as detailed in the DAPR.All data reduction procedures conform to those detailed in the DAPR.0000003.118.5016.70000003.118.50S3006This survey data was collected from August 15 to August 19 with the assistance of LTJG Joshua Fredrick of CO-OPs and Pacific Hydrographic Branch Pathways intern, Adrian Biesel. 00000.372019-08-152019-08-162019-08-172019-08-182019-08-19SupportFiles\NRT_3_WSF.jpgNRT-Seattle with F/V SALISH in Keystone Harbor. This hydrographic survey was acquired in accordance with the requirements defined in project instructions S-N921-NRT3-19 (Figure 1). F00788 survey area includes the approach to Keystone Harbor and Keystone Harbor in the vicinity of Whidbey Island. 122.69416111148.1469344444122.65966083348.1469344444SupportFiles\F00788_survey_overview.pngF00788 assigned survey limits (in red) overlaid on chart 18464_1 and completed survey area. F00788 data was reviewed in HIPS and SIPS for holidays in accordance with Section 5.2.2.3 of the HSSD. Three holidays were identified via HydrOffice QC Tools Holiday Finder. The tool automatically scans the surface for holidays as defined in the HSSD and was run in conjunction with a visual inspection of the density surface by the hydrgrapher. There are three holidays within this project. Two data gaps are along a rocky seawall and are in less than 4 meters of water (Figure 3). The final holiday is due to a mooring pile that is utilized by the ferry. This pile is represented in the final feature file (Figure 4). Flier Finder results are discussed in section B.5.2 of this report. Complete multibeam coverage was achieved within the limits of hydrography as defined in the project instructions with some exceptions (Figure 5). In all areas where the 3.5 meter depth contour or the sheet limits were not met, the Navigable Area Limit Line (NALL) was defined as the inshore limit of bathymetry due to the risks of maneuvering the survey vessel in close proximity to the shoreline, obstructions, and kelp (Figure 6). This survey represents a small area of north Puget Sound, and is outside the channel (Figure 7 and 8). SupportFiles\F00788_holiday_1.pngTwo inshore holidays exist in four meters of water along the eastern sea wall approaching Keystone Harbor. SupportFiles\F00788_holiday_2.pngA data gap exists due to location of a pier piling. SupportFiles\F00788_NALL.pngExample of where NALL was the inshore limit of safe navigation due to dense kelp beds, represented in the final feature file. SupportFiles\IMG_0367_rotated.jpgDense kelp beds exist inshore of 8 meters on the north eastern and western shores of Keystone Harbor. Object Detection Coverage (Refer to HSSD Section 5.2.2.2)All waters in the survey areaSAR: As a result of being formed by spurious soundings, the gridded data withing the Figure 3 box has been rejected in review. Those spurious grid nodes no longer exist in the gridded surface.SupportFiles\F00788_coverage_overview.pngSurvey coverage overview in relation to Port Townsend, WA on chart 18464SupportFiles\F00788_overview_north_whidbey.pngSurvey coverage relative to northern Puget Sound on chart 18441 Data acquired in F00788 meet multibeam echo sounder (MBES) coverage requirements for object detection, as required by the HSSD. This includes crosslines (see Section B.2.1), NOAA allowable uncertainty (see Section B.2.10), and density requirements (see Section B.2.11). The surface was analyzed using the HydrOffice QC Tools Grid QA feature (Figure 2). Density requirements for F00788 were achieved with at least 99.5% of surface nodes containing five or more soundings as required by HSSD Section 5.2.2.3. The few nodes that did not meet density requirements are due to sparse data in the outer beams, slopes and rocky areas where acoustic shadowing occurred, and at the edges of the survey limits.The entire survey is adequate to supersede previous data.SupportFiles\F00788_MB_VR_MLLW_Final.QAv5.density.pngPydro derived histogram plot showing HSSD object detection compliance of F00788 MBES with the finalized CUBE surface. This survey was completed at the request of the Washington State Ferries due to reported shoaling in the approaches to Keystone Harbor in the route of the two passenger ferries. This area was last surveyed in the 1940s and is intended to update National Ocean Service (NOS) nautical charting products. This survey includes the harbor the ferries use to load and unload passengers, vehicles, and goods in Whidbey island. Additionally, there is a small boat ramp at Keystone Harbor managed by Washington State parks. Data was acquired to the survey limits in accordance with the requirements in the Project Instructions and the Nation Ocean Service (NOS) 2019 Hydrographic Survey Specifications and Deliverables (HSSD). NOAAApproach to Keystone Harbor 1United StatesWashington10000S-N921-NRT3-19F00788Approach to Keystone HarborS-N921-NRT3-19NOAA Navigation Response Team 3Keystone HarborPacific Hydrographic BranchAny 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 10N, MLLW. All references to other horizontal or vertical datums in this report are applicable to the processed hydrographic data provided by the field unit.Navigable AreametersMultibeam Echo Sounder BackscatterMultibeam Echo Sounder2019UTC 10N2019-08-192019-08-152019-08-13Michelle M. Levano, LTJG/NOAANo overhead features exist for this survey.No present or planned construction or dredging exist within the survey limits.No submarine features exist for this survey.No platforms exist for this survey.This is the primary terminal for Washington State Ferries, in addition to a small boat launch for primarily recreational vessels. Survey data from F00788 should adequate to create a small scale chart of the Keystone Harbor. One USCG AtoN and one private light were assigned and investigated in the survey area of F00788. The light characteristics were not observed due to daylight, but structures were correctly positioned and serving their intended purpose. Washington State ferry operators were able to confirm that the fog signal and light were operational. This survey was at the request of the Washington State ferries, F00788 survey data includes the Coupeville, WA ferry terminal (Figure 24). This terminal is utilized by two Washington State Ferries that operate in the area roughly every 30 minutes. SupportFiles\F00788_ferry_route.pngCharted ferry route over F00788 survey dataNo abnormal seafloor and/or environmental conditions exist for this survey.No Maritime Boundary Points were assigned for this survey.No bottom samples were required for this survey.No new surveys or further investigations are recommended for this area.US5WA28M2019-05-252019-05-152220000 Shoal soundings are compared in section D.1.1 of this report. Field derived survey data was compared to charted dredged depths. There was one danger to navigation report submitted with this survey that can be found in the appendixes of this report. SupportFiles\F00788_000000005200001_a.pngImage from the danger to navigation report submitted to MCD of a shoal sounding from F00788. Heavy kelp that is to thick to navigate was observed on both the western and eastern shorelines. This area has been encoded as a foul area, and provided the remarks "Foul with kelp" into the file feature file of this survey (Figure 22). SupportFiles\IMG_0368_rotated.jpgExample of heavy kelp observed on the shorelines of F00788. No charted features exist for this survey.F00788 survey data included the dredge channel utilized by Washington State ferries to approach the Coupeville, WA ferry terminal. There is significant shoaling differences from the charted dredged channel, and F00788 survey data. Sounding comparisons and overview are discussed in section D.1.1 of this report (Figure 23). SupportFiles\F00788_charted_channel.pngExtents of F00788 survey data compared to the charted channel on NOAA chart 18464_1. Depth legend is in meters. The chart comparison was made using a CARIS sounding and contour layer derived from the finalized VR surface. The contours and sounders were overlaid on the chart and compared for general agreement and to identify areas of significant change. Projected UTM 10Precise Positioning-Real Time Extended (PP-RTX) processing methods were used in Applanix POSpac MMS 8.3 software to produce SBETs for post-processing horizontal correction. All of F00788 meets HSSD horizontal accuracy requirements North American Datum 1983Sounding elevations relative to the ellipsoid were collected through Ellipsoidal Referenced Survey (ERS) with post-processing of the daily logged POSPac data to create a statistical best estimate of trajectory (SBET) file, as detailed in the DAPR. All of F00788 meets HSSD vertical accuracy requirements.S-N921-NRT3-19_Sheets_100m_NAD83-MLLW_Geoid12b_ERS via VDATUMMean Lower Low WaterField installed tide and GPS stations were not utilized for this survey. There is no HVCR report included with the submission of F00788.2019-09-20Data Acquisition and Processing ReportChief of Party2019-09-20Michelle M. Levano, LTJG/NOAAAll field sheets, this Descriptive Report, and all accompanying records and data are approved. All records are forwarded for final review and processing to the Processing Branch.The survey data meets or exceeds requirements as set forth in the NOS Hydrographic Surveys Specifications and Deliverables, Field Procedures Manual, Letter Instructions, and all HSD Technical Directives. These data are adequate to supersede charted data in their common areas. This survey is complete and no additional work is required with the exception of deficiencies noted in the Descriptive Report.As Chief of Party, field operations for this hydrographic survey were conducted under my direct supervision, with frequent personal checks of progress and adequacy. I have reviewed the attached survey data and reports.