S-L904-NRT6-15San Francisco Piers 34 and 36San Francisco BayNRT-6F006571San Francisco Piers 34 and 36CaliforniaUnited States100002015Ian ColvertNavigable Area2015-03-252015-08-122015-08-12Multibeam Echo SounderMultibeam Echo Sounder BackscattermetersUniversal Transverse Mercator (UTM)UTCPacific Hydrographic BranchThe purpose of this survey is to provide contemporary surveys to update National Ocean Service (NOS) nautical charts. All separates are filed with the hydrographic data. Any revisions to the Descriptive Report (DR) generated during office processing are shown in bold red italic text. The processing branch maintains the DR as a field unit product, therefore, all information and recommendations within the body of the DR are considered preliminary unless otherwise noted. The final disposition of surveyed features is represented in the OCS nautical chart update products. All pertinent records for this survey, including the DR, are archived at the National Centers for Envitronmental Information (NCEI) and can be retrieved via http://www.ncei.noaa.gov/.NOAAThe United States Coast Guard requested a hydrographic survey near Piers 34 and 36 at the San Francisco waterfront. 37.7875583333122.37669166737.7812611111122.389122222A charted wreck located near the approaches to Piers 34 and 36 (37-47-03.32N, 122-22-44.15W) was investigated.Coverage of wreck (right) deviates from assigned coverage (black polygon) for survey F00657.SupportFiles\A4_survey_coverage_deviation.pngThe USCG is reporting shoaling in the area, and both Piers 34 and 36 have been removed but are still represented on the nautical chart. The field team is assigned to survey depths and verify that the piers were fully removed and no submerged dangers remain.The entire survey is adequate to supersede previous data.Water depth for survey F00657 range between 0.83 - 22.35 meters.Complete Coverage is assigned for survey F00657, requiring 0.5 meter resolution CUBE surface representing depths between 0 - 22 meters. Areas of survey F00657 exceeded depths of 20 meters, but not deeper than 22.35 meters, were included in the 0.5 meter CUBE surface because data density met 0.5 meter requirements.Areas (red) where depths exceed 20 meters. SupportFiles\red_exceeds.pngSurvey F00657 bathymetry overlaid chart 18650, San FranciscoSupportFiles\A4_Survey_Coverage.pngS300307.419000000.359007.419000000.35904.8400000.09182015-08-12Refer 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.S3003320.5KongsbergEM 3002MBESThe hydrographer also used the following: 1)Sea-Bird SeaCat SBE 19+ CTD Profiler; 2) ODOM Digibar Pro surface sound speed velocity probe; 3) Applanix Model 320 Version 5 POS/MV; 4) Trimble SPS361 DGPS beacon receiver.Crosslines were conducted for survey F00657, totaling 4.84% of survey mainscheme. Crosslines exhibit strong agreement to mainscheme, within NOAA specifications. Uncertainty values submitted, finalized grid calculated in CARIS HIPS & SIPS using "greater of the two" of total propagation certainty and standard deviation (scaled to 95%). All uncertainty proofs completed using Pydro Finalized CSAR QA. For survey F00657, 93.8% of nodes pass object detection coverage, and 99.9% nodes pass uncertainty standards.F00657 Object Detection CoverageSupportFiles\B2_uncert_F00657_50_cm_Final_Density.pngF00657 Uncertainty StandardsSupportFiles\B2_uncert_F00657_50_cm_Final_TVU_QC.pngNo junction surveys were provided for survey F00657.Sonar system quality control checks were conducted as detailed in the quality control section of the DAPR.None ExistThere were no conditions or deficiencies that affected equipment operational effectiveness.None ExistThere were no other factors that affected corrections to soundings.One cast used for survey F00657. Duration of survey did not exceed four hours nor extend beyond region of sound velocity constraints.All equipment and survey methods were used as detailed in the DAPR.All data reduction procedures conform to those detailed in the DAPR.All sounding systems were calibrated as detailed in the DAPR.Backscatter was not collected for this survey.Backscatter data was collected in the raw bathymetry files and was processed by the processing branch during review.CarisHIPS/SIPS8.1.13NOAA Profile V_5_3F00657_50_cmCUBE500.8322.35NOAA_0.5mObject DetectionF00657_50_cm_FinalCUBE500.8322.35NOAA_0.5mObject DetectionFor survey F00657, one grid surface is used: a 50 cm CUBE surface, finalized.Additional information discussing the vertical or horizontal control for this survey can be found in the accompanying HVCR.Mean Lower Low WaterDiscrete Zoning9414750.tidFinal ApprovedL904NRT62015CORP.zdfFinal2015-09-162015-09-29F00657 complies with the requirements from CO-OPS which were included with the project data from the Navigation Response Branch. F00657 submitted with final approved water levels applied.The Tide Note is attached.North American Datum of 1983 (NAD83)10Pigeon Point, CA (287 kHz)Due to the small area surveyed, a soundings layer generated from bathymetry overlaid over chart 18650 and ENC US5CA13M are used for chart comparisons. 18650182420000572013-122015-10-142015-10-14CHART 18650 COMPARISON Piers 34 and 36 disproven. The hydrographer recommends removing Piers 34 and 36 from chart. Generally, bathymetric soundings agreed with charted depths within a half meter, with exceptions: A two foot sounding, among a debris field, is located within the charted Pier 36 ruin. A 25 foot sounding located adjacent south of charted Pier 36 ruin disproven by seven foot sounding. No evidence of features or debris field found within charted Pier 34 ruin. Bathymetery of charted wreck exhibited sounding two foot deeper than as charted. San Francisco Piers 34, 36 soundings / chart comparisonSupportFiles\F00657_CHARTLET_01_of_03.jpgENC US5CA13M20000722015-10-082015-10-08falseENC US5CA13M COMPARISON Piers 34 and 36 disproven. The hydrographer recommends removing Piers 34 and 36 from ENC.ENC US5CA13M compared with bathymetrySupportFiles\D1_ENC_comparison.pngNo Maritime Boundary Points were assigned for this survey.No charted features exist for this survey.No uncharted features exist for this survey.No Danger to Navigation Reports were submitted for this survey. An area of foul ground that is not charted exists within charted Pier 36 ruins. Refer to F00657_FFF.hob for delineation. Bathymetry exhibits debris field within charted Pier 36 ruin.SupportFiles\F00657_CHARTLET_03_of_03.jpgThe F00657_FFF.hob is not appended to this report.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.No bottom samples were required for this survey.Two shoreline features were assigned for survey F00657. Assigned feature Pier 34: No evidence of features or debris field was found within charted Pier 34 ruin. The Hydrographer recommends removing Pier 34 ruin from chart. Assigned feature Pier 36: A two foot sounding, among a debris field, is located within the charted Pier 36 ruin. The Hydrographer recommends removing Pier 36 ruin from chart and adding a debris field, with least depth known. Brannan Street Warf: construction of Brannan Street Warf has altered the shoreline boundary of the survey area, encroaching as much as 35 meters from charted shoreline. Brannan Street Warf (google map) overlaid over survey F00657, altering shoreline boundary.SupportFiles\google_earth_comp.jpgWith respect to assigned feature Pier 36, the least depth found during review was one foot. The one foot sounding was included as the least depth within a foul ground obstruction area in the chart update product. As noted in the chart comparison above, the charted wreck was investigated and found to be two feet deeper than charted. See attached Feature Report. Prior survey comparisons exist for this survey, but were not investigated.Although ATONs were not assigned for survey F00657, ATONs charted within survey area were noted by survey crew as charted and verified for location and purpose. 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.Ian ColvertChief of Party2015-12-07