OPR-B307-FH-15Rhode Island Sound and ApproachesRhode Island Sound and ApproachesNOAA Ship Ferdinand R. HasslerH12811410 NM Southeast of Nomans LandRhode IslandUnited States400002015LCDR Briana Welton, NOAANavigable Area2015-05-222015-07-162015-07-26Multibeam Echo SounderMultibeam Echo Sounder BackscattermetersUniversal Transverse Mercator (UTM)UTCAtlantic Hydrographic BranchNOAAThe survey area is located in Rhode Island Sound, within the sub-locality approximately 8.5NM south of Martha's Vineyard as shown in Figure 1.41.333527777870.711722222241.114555555670.5570555556H12811 survey limitsfile:///R:/00_PROJECTS/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12811/DR_Images/H12811_Survey_Coverage.JPGSurvey limits were extended to include portions of sheet H12810. The northernmost section was surveyed separately to avoid large amounts of fishing boat traffic. The southern edge of survey acquisition coverage was extended to increase ship efficiency by minimizing maneuvering.H12811 Coverage Modificationsfile:///R:/00_PROJECTS/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12811/DR_Images/H12811_Survey_coverage_Deviation.pngTo support safe navigation through the acquisition and processing of hydrographic survey data for updating nautical charts and by the identification and dissemination of dangers to navigation as identified during the course of survey operations.The entire survey is adequate to supersede previous data.All waters in survey areaComplete MBES with backscatterSurvey coverage was in accordance with the requirements listed above and in the HSSD.Coverage overview of H12811file:///R:/00_PROJECTS/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12811/DR_Images/H12811_Survey_coverage_overview.pngS2500873.3190000060.70100873.3190000060.70106.9600060.042015-07-162015-07-172015-07-182015-07-192015-07-202015-07-212015-07-222015-07-232015-07-242015-07-252015-07-26Mainscheme survey lines were run with a dual-head multibeam echosounder. Linear nautical miles for the dual-head system were calculated using statistics from the starboard head.Refer 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.S25037.73.77NOAA Ship FERDINAND R. HASSLER alongside pier at Marine Operations Center - Atlanticfile:///R:/00_PROJECTS/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12811/DR_Images/Hassler.pngNOAA Ship FERDINAND R. HASSLER (S250), shown in Figure 4, acquired all data within the limits of H12811.RESON7125MBESApplanixPOS M/V 320 V5Positioning and Attitude SystemHemisphereMBX-4Positioning SystemAMLMicroCTDSound Speed SystemBrooke OceanMVP-200Sound Speed SystemRESONSVP-70Sound Speed SystemSea BirdSBE 19+Conductivity, Temperature, and Depth SensorA geographic plot of cross lines is shown in Figure 5. Crosslines were filtered to remove soundings greater than 45 degrees from nadir. To evaluate cross line agreement, two 2-meter surfaces were created: one from crossline soundings, the other from mainscheme soundings. These two surfaces were differenced using CARIS BASE Editor. The difference surface has a maximum difference of -2.63 meters. The statistical analysis of the differences between the mainscheme and crossline surfaces is shown in Figure 6. The average difference between the surfaces is 0.01 meters with a standard deviation of 0.11meters meters; 95% of nodes agree within +/- 0.22 meters from the mean.H12811 MBES crossline data, shown in purple, overlaid on mainscheme surface.file:///R:/00_PROJECTS/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12811/DR_Images/H12811_Survey_Coverage_XL.JPGH12811 MBES crossline statistical analysis.file:///R:/00_PROJECTS/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12811/DR_Images/H12811_XL_MS_Diff.png0.010.132S2501.01.00.5All data for survey H12811 were reduced to MLLW via a vertical datum transformation (VDatum) model which was provided to the field unit by HSD OPS. The tide TPU values were provided in the Project Instructions. Two junction comparisons were completed for H12811 as shown in Figure 7. Both surveys were completed by NOAA Ship FERDINAND R. HASSLER: H12801 and H12802 in 2015. Both Surveys are also part of the same project, OPR-B307-FH-15. All junction surfaces were subtracted from the surface of H12811 to assess sounding consistency. H12811 and junction surveysfile:///R:/00_PROJECTS/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12811/DR_Images/H12811_Junctions.JPGH12801200002015NOAA Ship FERDINAND R. HASSLERWThe area of overlap between sheet H12811 and its junction sheet H12801, shown in Figure 8, was reviewed in CARIS subset editor. H12811 was subtracted from the surface of the junctioning survey to assess sounding consistency. Survey H12801 was conducted by NOAA Ship FERDINAND R. HASSLER in 2015 during the course of project OPR-B307-FH-15. A difference surface analysis between H12811 and H12801 2-meter resolution surfaces, which included over 1 million nodes, showed H12811 on average 0.04 meters deeper then H12801, with a standard deviation of 0.11 meters. 95% of all differences are less than 0.22 meters from the mean. Junctioning area between surveys H12811 and H12801file:///R:/00_PROJECTS/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12811/DR_Images/B2_H12801_2m_minus_H12811_2m.jpegJunction comparison statistics of H12811 and H12802file:///S:/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12801/Data/Processed/Working/Junctions/Latest_greatst_2m_H12801_minus_H12811/H12801_2m_minus_H12811_2m.pngH12802400002015NOAA Ship FERDINAND R. HASSLERWThe area of overlap between sheet H12811 and its junction sheet H12802, shown in Figure 10, was reviewed in CARIS subset editor. The junctioning survey was subtracted from the surface of H12811 to assess sounding consistency. Survey H12802 was conducted by NOAA Ship FERDINAND R. HASSLER in 2015 during the course of project OPR-B307-FH-15. A difference surface analysis between H12811 and H12802 4-meter resolution surfaces, which included over 1 million nodes, showed H12811 on average 0.28 meters deeper then H12802, with a standard deviation of 0.20 meters. 95% of all differences are less than 0.38 meters from the mean.Junctioning area between H12811 and H12802file:///R:/00_PROJECTS/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12811/DR_Images/H12802_H12811_Junction_overview.jpgJunction comparison statistics of H12811 and H12802file:///R:/00_PROJECTS/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12811/DR_Images/H12802_H12811_Diff.pngSonar system quality control checks were conducted as detailed in the quality control section of the DAPR.HYPACK Forcing File ExtenstionsEvery line acquired in the extents of survey H12811 had two file extensions added on to it during acquisition. This resulted in the raw survey lines being name XXX_XXXX.hsx.s7k. The only negative effect of this was seen in backscatter processing with Fledermaus FMGT. The extension .hsx extension was removed for processing.Surface Sound Speed SpikesA holiday located at approximately south west from the 125 foot sounding on chart 13218 was caused by a spike in the surface sound speed profile. The hydrographer tried to interpolate over this spike the port and starboard line 000_0804.HSX for DN198 in CARIS Attitude Editor but the interpolation did not improve the data quality. The data was removed as it did not meet specification. Surface sound speed holiday overviewfile:///R:/00_PROJECTS/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12811/DR_Images/H12811_SSV_Holiday_overview.jpgExample of surface sound speed spike from DN198 on port line 000_0804.HSX.file:///R:/00_PROJECTS/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12811/DR_Images/SSPinAttitudeEditor.PNGRejected data represented in CARIS Subset Editor. file:///R:/00_PROJECTS/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12811/DR_Images/SSPinSubsetEditor.pngSound Speed VariabilityDN 198 and 199 provided very challenging environmental conditions in terms of sound speed. On average casts were taken at an interval of 15-20 minutes which was not frequent enough to account for the variability. Figures 15 and 16 show the sound speed profiles from these days. As a result, refraction artifacts do exist in H12811. The hydrographer has rejected refraction data which does not meet TVU specifications. Some of the rejected data resulted in small holidays but hydrographer analysis of the holiday areas indicates no existence of navigationally significant features. DN198 Sound Speed Profiles.file:///R:/00_PROJECTS/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12811/DR_Images/DN198SoundSpeedCasts.pngDN199 Sound Speed Profiles.file:///R:/00_PROJECTS/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12811/DR_Images/DN199SoundSpeedCasts.pngIncreased overlap to compensate for sound speed artifactsfile:///R:/00_PROJECTS/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12811/DR_Images/H12811_increased_overlap.jpgA total of 349 sound speed measurements were taken within the boundaries of survey H12811. Due to the stratification of the water column and variance between consecutive sound speed profiles, casts were taken at a variety of intervals, ranging from 5 minutes to 30 minutes using the MVP 200. In general sound speed corrections were applied in CARIS using Nearest in Distance Within Time (NDWIT) of 1 hour for the entire survey. Sound speed artifacts exist throughout the survey, with most being outside of the IHO total vertical uncertainty limits for the corresponding water depth. This was compensated for by increasing coverage overlap. Examples of this can be seen in the Factors Affecting Soundings section.All equipment and survey methods were used as detailed in the DAPR.Holidays and data gapsFour holidays were identified in survey H12811 as defined by 2015 HSSD in Section 5.2.2.2. For a complete coverage survey, a holiday is defined as at least three nodes by three nodes. The holidays shown in Figures 18 and 19 are due to poor overlap in the outer beams. The holidays shown in Figures 20 and 21are due to sound speed variability and surface sound speed spikes, respectively (see Section B.2.6 of this report in this report for more information). These holidays do not exist in areas where significant shoals or features are present.Holiday in 1m surface located at 41-18-13.58N, 70-36-44.12W.file:///R:/00_PROJECTS/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12811/DR_Images/Holiday_1.PNGHoliday in 1m surface located at 41-13-29.72N, 70-37-33.96W.file:///R:/00_PROJECTS/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12811/DR_Images/Holiday_2.PNGHolidays in 2m surface located approximately 41-08-19.87N, 70-41-20.84W.file:///R:/00_PROJECTS/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12811/DR_Images/Holiday_3.PNGHoliday in 2m surface located at 41-08-28.74N, 70-39-38.62W.file:///R:/00_PROJECTS/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12811/DR_Images/Holiday_4.PNGData Density AnalysisA density analysis was run to calculate the number of soundings per surface node. The results determined that over 99% of all nodes in each finalized surface contain five or more soundings. The density analysis was executed on nodes which are populated by at least one sounding and did not account of holidays located within the surface. Data density analysis for 1-meter finalized surface.file:///R:/00_PROJECTS/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12811/DR_Images/H12811_MB_1m_MLLW_0to20m_Final_Density.pngData density analysis for 2-meter finalized surface.file:///R:/00_PROJECTS/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12811/DR_Images/H12811_MB_2m_MLLW_18to40m_Final_Density.pngData density analysis for 4-meter finalized surface.file:///R:/00_PROJECTS/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12811/DR_Images/H12811_MB_4m_MLLW_36to80m_Final_Density.pngTotal Vertical Uncertainty AnalysisTotal vertical uncertainty analysis was performed using the Finalized CSAR QA tool within Pydro. The resulting statistical analysis found that 100% of nodes within survey H12811 meet the vertical uncertainty standards.Total vertical uncertainty analysis for 1-meter finalized surface.file:///R:/00_PROJECTS/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12811/DR_Images/H12811_MB_1m_MLLW_0to20m_Final_CalculatedTVU.pngTotal vertical uncertainty analysis for 2-meter finalized surface.file:///R:/00_PROJECTS/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12811/DR_Images/H12811_MB_2m_MLLW_18to40m_Final_CalculatedTVU.pngTotal vertical uncertainty analysis for 4-meter finalized surface.file:///R:/00_PROJECTS/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12811/DR_Images/H12811_MB_4m_MLLW_36to80m_Final_CalculatedTVU.pngAll data reduction procedures conform to those detailed in the DAPR.All sounding systems were calibrated as detailed in the DAPR.Backscatter was logged in RESON datagram 7008 snippets record in the raw .s7k files. The .s7k file also holds the navigation record and bottom detections for all lines of Survey H12811. The files were paired with the CARIS HDCS data, imported, and processed using Fledermaus Geocoder Toolbox (FMGT). The FMGT project and backscatter mosaic is included in the field submission. The processed mosaic is formatted as a geo-tiff image per specifications.NOAA Profile V_5_3H12811_MB_1m_MLLWCUBE111.7924.71NOAA_1mComplete MBESH12811_MB_2m_MLLWCUBE211.7983.20NOAA_2mComplete MBESH12811_MB_4m_MLLWCUBE411.8043.97NOAA_4mComplete MBESH12811_MB_1m_MLLW_0to20m_FinalCUBE111.7920NOAA_1mComplete MBESH12811_MB_2m_MLLW_18to40m_FinalCUBE21840NOAA_2mComplete MBESH12811_MB_4m_MLLW_36to80m_FinalCUBE43643.97NOAA_4mComplete MBESH12811_MB_4m_MLLW_CombinedCUBE411.7943.97NOAA_4mComplete MBESCARIS CUBE Surfaces Not Honoring Features During processing it was noticed that least depths on rocks and boulders were not being reflected in the CUBE surfaces generated by CARIS. For example a 1.68 meter rock is not being honored at a depth of 27 meters. While this resulted in many designated soundings, the 40000 meter chart scales made the horizontal component of the designation threshold 80 meters (2mm at survey scale) decreasing the potential number of designated soundings. The hydrographer felt it was unnecessary to adjust finalized surface ranges to mitigate the issue, but resulted in 509 designated soundings. An example of this is shown in Figure 28.H12811 Features not being honored by Cube surfacefile:///R:/00_PROJECTS/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12811/DR_Images/H12811_Surface_Not_Honoring.jpgAdditional information discussing the vertical or horizontal control for this survey can be found in the accompanying HSTB base station report.Mean Lower Low WaterTCARINewport, RI8452660Martha's Vineyard GPS Buoy, MA84488758452660.tidVerified ObservedB307FH2015CORP_rev.zdfPreliminaryB307FH2015_Final.tcFinal2015-07-302015-09-23A final TCARI grid was received for project OPR-B307-FH-15, H12811, during the time period between July 16 and July 26, 2015. The final TCARI grid included data from HSTB's water level buoy that was used during the project.VDatum2015_OPR-B307-FH-15_VDatum_NAD83_MLLW_revised.csar2015_OPR-B307-FH-15_VDatum_MLLW_to_NAD83_ReverseSEP.csarAll soundings submitted are reduced to Mean Lower Low Water (MLLW) using a VDatum separation model provided by HSD Ops. A VDatum model evaluation was conducted after acquisition was completed comparing a 100m resolution Ellipsoidally Referenced Zone Tide model derived from acquired soundings to the VDatum separation model provided. The results can be seen in Appendix IV. A reverse separation model was provided to assist in the trouble shooting of some SBET issues. The SBET issues were corrected by either reprocessing the SBET or the interpolation of SBET altitude spikes. This separation model was not used to reduce any data from H12811 to MLLW.North American Datum of 1983 (NAD83)UTM Zone 19NSingle BaseMartha's Vineyard 1, Martha's Vineyard, MAWMVY1Martha's Vineyard 2, Martha's Vineyard, MAWMVY2Single Base processing was the primary method used for for Post Processed Kinematics (PPK) processing of Applanix TrueHeave data for Smooth Best Estimate of Trajectory (SBET) production. SBET files have been loaded for all lines for survey H12811 and are used to reduce acquired soundings to MLLW via HSD OPs provided separation model.HSTB installed two base stations on Martha's Vineyard, MA, that were feeding real time correctors to the FERDINAND HASSLER throughout the acquisition process via 4G internet service. More details have been provided through a supplemental HSTB field report about the base station.Achushnet, MA (306 kHz)Interpolation of SBETSOn occasion, the SBET altitude exhibited spikes which compromised the data's ability to meet TVU specifications. In these instances, the hydrographer utilized tools in Pydro's POSPAC Automated QC tool to interpolate the SBET (See Figure 29 for an example). The interpolated SBET was exported out of POSPAC Automated QC tool, opened in POSPAC MMS, and exported again to ensure the SBET was in the correct datum (NAD83). The new SBET contains the prefix "interpolated" for easy identification. The following SBETs were interpolated for H12811: interpolated_2015_201_S250P, interpolated_2015_202_S250P_b, interpolated_2015_203_S250P_b, interpolated_2015_203_S250S_b. The original SBET for 2015_201_S250P is shown on the left with the highlighted spike in the altitude. On the right the red box shows that the interpolated SBET does not have such spike. file:///R:/00_PROJECTS/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12811/DR_Images/H12811_InterpolatedSBETExample.pngAltitude IssuesThe SBET created for 2015_203_S250P has poor altitude due to "Continuous primary GNSS position measurement rejections" (See Figure 30). The erroneous altitude occurs from approximately 10:30-13:19 (about 2 hours 50 minutes in duration). The poor altitude solution impacts 9 lines from the port transducer on DN203 (listed below). In an effort to produce a survey fully surveyed to the ellipse, these port transducer lines were removed from the project as the altitude issues could not be resolved. The hydrographer ensured that the removal of this data did not impact the survey's ability to meet density requirements and no holidays were created due to the removal of these lines. Lines Removed: 000_1048.HSX.s7k 000_1057.HSX.s7k 000_1100.HSX.s7k 000_1128.HSX.s7k 000_1155.HSX.s7k 000_1217.HSX.s7k 000_2141.HSX.s7k 000_1306.HSX.s7k 000_1309.HSX.s7k Some altitude issues remain in the survey, but meet total vertical uncertainty limits for the water depth where they are located. The example below (Figure 31) shows a 0.49 meter offset in 27 meters of water where the maximum vertical uncertainty is 0.61 meters.Altitude for SBET 2015_203_S250Pfile:///R:/00_PROJECTS/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12811/DR_Images/AutoQC_2015_203_S250P.pngAltitude spike example that was left in the surveyfile:///R:/00_PROJECTS/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12811/DR_Images/H12811_remaining_alttude_spike.jpgThe hydrographer has compared a sounding plot and derived depth contours from the surveyed area to the charted soundings and contours. In general, the depth derived contours line up with the previously charted contours with only a few exceptions.13233211040000192011-012015-03-312015-04-11Surveyed soundings generally agree within 1 to 2 feet of charted soundings, with the charted soundings being shoaler then depth derived soundings. The one sixty foot contour the chart shares with the surveyed area generally agrees with some minor changes due to surveyed soundings being slightly deeper then charted soundings.H12811 RNC 13233 60 Foot contour disagreementfile:///R:/00_PROJECTS/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12811/DR_Images/H12811_13233_60ft%20contour%20disagreement.jpg13218213980000422013-072015-03-312015-04-11Surveyed soundings generally agree within 1 to 2 feet of charted soundings, with the charted soundings being shoaler than depth derived soundings. The sixty foot and ninety foot contours the chart shares with the surveyed area generally agree with some minor changes due to surveyed soundings being slightly deeper then charted soundings.H12811 RNC 13218 60 Foot contour disagreementfile:///R:/00_PROJECTS/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12811/DR_Images/H12811_60_Contour_disagreement_13218.jpgH12811 RNC 13218 90 Foot contour disagreementfile:///R:/00_PROJECTS/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12811/DR_Images/H12811_90_Contour_disagreement_13218.jpg13237210680000422013-052015-05-052015-05-16Surveyed soundings generally agree within 1 to 2 feet of charted soundings, with the charted soundings being shoaler then depth derived soundings. The ninety foot contour the chart shares with the surveyed area generally agrees with some minor changes due to surveyed soundings being slightly deeper then charted soundings.H12811 RNC 13218 90 Foot contour disagreementfile:///R:/00_PROJECTS/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12811/DR_Images/H12811_90_Contour_disagreement_13237.jpgUS4MA23M US4MA43M US5MA29M80000272015-03-312015-04-27falseENC soundings were extracted from the S-57 files and differenced from the 4-meter combined surface from H12811. This difference surface was then used to create an interpolated surface. The depth differences ranged from -4.45 to 2.23 feet. On average surveyed soundings were 1.4 deeper then charted soundings with a standard deviation of 0.3 feet. ENC contours correspond with RNC contours, see RNC comparison above for ENC contour comparison.H12811 ENC sounding comparisonfile:///R:/00_PROJECTS/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12811/DR_Images/H12811_ENC_Diff_Surface.jpgH12811 ENC sounding comparison statisticsfile:///R:/00_PROJECTS/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12811/DR_Images/H12811_ENC_Diff.pngNo Maritime Boundary Points were assigned for this survey.Two charted features exist within the coverage of sheet H12811. The charted features were examined in CARIS subset editor and were not found. The charted wreck PA near the 89 and 94 foot sounding on RNC 13218 was covered with 100% multibeam and did not appear in the surface or when examined in CARIS subset editor. The charted obstruction PA near the southeast corner of RNC 13218 was covered with 100% multibeam and did not appear in the surface or when examined in CARIS subset editor. Wreck disproval located near north east 90 foot contourfile:///R:/00_PROJECTS/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12811/DR_Images/H12811_wreck%20disproval.jpgObstruction disproval located on south east corner of chart 13218file:///R:/00_PROJECTS/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12811/DR_Images/H12811%2013218_Obstuction%20disproval.jpg Five uncharted rocks were added to the final feature file. The rocks were located in the north west portion of the sheet. An example of the rocks, as well as an overview of there location can be seen below. For position and depth of the rocks refer to the final feature file.H12811 Uncharted rock examplefile:///R:/00_PROJECTS/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12811/DR_Images/H12811_Uncharted_Rock_Ex.jpgH12811 Uncharted rock overviewfile:///R:/00_PROJECTS/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12811/DR_Images/H12811_Uncharted_Rock_Overview.jpgNo Danger to Navigation Reports were submitted for this survey.No shoals or potentially hazardous features exist for this survey.No channels exist for this survey. There are no designated anchorages, precautionary areas, safety fairways, traffic separation schemes, pilot boarding areas, or channel and range lines within the survey limits.Six bottom samples, chosen from HSD OPS suggestions and acquired backscatter, were taken within the limits of H12811 and are submitted with the final feature file, as shown below in Figure 40. Bottom samples consisted mostly of coarse to fine sand.H12811 bottom sample locationsfile:///R:/00_PROJECTS/2015/OPR-B307-FH-15_Rhode_Island_Sound/H12811/DR_Images/H12811_BS_Location.jpgShoreline was not assigned in the Hydrographic Survey Project Instructions or Statement of Work.No prior survey comparisons exist for this survey.No Aids to navigation (ATONs) exist for this survey.No overhead features exist for this survey.No submarine features exist for this survey.No ferry routes or terminals exist for this survey.No platforms exist for this survey.No significant features exist for this survey.No present or planned construction or dredging exist within the survey limits.No new surveys or further investigations are recommended for this area.No new insets are recommended for this area.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.All 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 and Specifications Deliverables Manual, 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.LCDR Briana Welton, NOAAChief of Party2016-03-06LT Jon Andvick, NOAAField Operations Officer2016-03-06Patrick BerubeSenior Survey Technician2016-03-06