Samantha C. McGill Angela C. Tan 20250820 Comma-separated values data release DOI:10.5066/P14D723N Pacific Coastal and Marine Science Center, Santa Cruz, California U.S. Geological Survey https://doi.org/10.5066/P14D723N Samantha C. McGill Jessica R. Lacy Andrew W. Stevens Rachel M. Allen Peter Dartnell Joanne C. Thede Angela C. Tan Gerald A. Hatcher 2025 data release DOI:10.5066/P14D723N Pacific Coastal and Marine Science Center, Santa Cruz, California U.S. Geological Survey Suggested Citation: McGill, S.C., Lacy, J.R., Stevens, A.W., Allen, R.M., Dartnell, P., Thede, J.C., Tan, A.C., and Hatcher, G.A., 2025, Hydrodynamic, bathymetric, and sediment transport data spanning dredge material placement in south San Francisco Bay, California, 2023-2025: U.S. Geological Survey data release, https://doi.org/10.5066/P14D723N. https://doi.org/10.5066/P14D723N Water samples were collected in south San Francisco Bay between August 2023 and August 2024 to measure suspended sediment concentration. The water samples were collected near USGS instrument platforms (see time-series data page) with a peristaltic pump. The suspended sediment concentrations of the samples were determined at the USGS Pacific Coastal and Marine Science Center sediment lab. Measured suspended sediment concentrations were used to calculate calibration coefficients that can be used to convert time series of turbidity data to time series of suspended sediment concentrations. These calibration coefficients can be found in file: DMP23_Turbidity_to_SSC_calibration_constants.csv, one of the support files for the time-series data section of this data release. These data were collected to calibrate turbidity data from optical backscatter sensors to suspended-sediment concentration. These data were collected as part of a collaborative study with USGS Western Ecological Research Center monitoring the pilot project conducted by U.S. Army Corps of Engineers San Francisco District. The study investigated the transport, impacts, and evolution of strategically placed dredged material in a shallow subtidal region adjacent to a marsh. Goals of this study were to assess the potential use of shallow-water placement for marsh management and restoration while gaining insight into local sediment transport adjacent to marshes in the shallows of south San Francisco Bay. These data are intended for researchers, students, policy makers, and the general public. Information about the data collection field activities can be found at: https://cmgds.marine.usgs.gov/fan_info.php?fan=2023-655-FA Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. 20230810 20240813 ground condition at time sample was collected Complete None planned -122.18533 -122.14645 37.61126 37.57592 USGS Metadata Identifier USGS:a93a2185-c583-44d4-8a89-af66789dea86 ISO 19115 Topic Category oceans Data Categories for Marine Planning Water-Quality Parameters USGS Thesaurus suspended material (water) field sampling water sampling marine water quality suspended material (water) None USGS U.S. Geological Survey PCMSC Pacific Coastal and Marine Science Center CMHRP Coastal and Marine Hazards and Resources Program Geographic Names Information System San Francisco Bay State of California none South San Francisco Bay Eden Landing Ecological Reserve No access constraints USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey (USGS) as the originator of the dataset and in products derived from these data. U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

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Santa Cruz CA 95060 831-460-4747 pcmsc_data@usgs.gov Data values are within the expected value range and have been used to calibrate coincident turbidity measurements in the file: DMP23_Turbidity_to_SSC_calibration_constants.csv. This file can be found in the support files for the time series data section of this data release. Data values are within the expected values for suspended sediment in south San Francisco Bay. Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. Specific field notes were retained in the file to support further use of the data. All other horizontal positions were derived from ship navigation systems, which included: Garmin GPSMAP 7610 and a Garmin GPS19x antenna, Garmin GPSmap XSV chartplotter and a Garmin GPS19x antenna, and Garmin Echomap UHD2 64sv w/ inbuilt GPS antenna; all were WAAS-capable, and had location to within 3 m. No formal positional accuracy tests were conducted. Pumped samples were collected with the intake valve at a fixed height on the sampling frame either resting on the seabed or suspended from the vessel. Water samples were collected periodically between August 2023 and August 2024 using a peristaltic pump. Tubing extended from the pump to a metal frame of a known height, that was lowered off the side of the ship to a desired elevation below the water surface (after determining the total water depth from the ships echosounder). The frame was held at the desired depth until a 1-liter plastic bottle was filled. Sampling positions were recorded using the ships navigation system. Samples were placed in cold storage until processed. 20240813 The suspended sediment concentrations of the samples were determined in the USGS Pacific Coastal and Marine Science Center sediment lab. Suspended sediment concentrations were determined by filtering a known, subsampled volume of sample through a pre-weighed 0.45 micrometer nitrocellulose membrane filter, which is then dried and reweighed to determine the mass of suspended sediment caught on the filter. The mass of the suspended sediment in the water sample was calculated by subtracting the weight of the clean filter from the weight of the dried filter with captured sediment. This dried sediment weight (in milligrams) is divided by the liquid volume of sample filtered (in liters) to estimate the concentration of suspended sediments. 20240819 Data were collected in San Francisco Bay, California Point Point 220 1.0E-5 1.0E-5 Decimal degrees World Geodetic System 1984 (WGS84) WGS84 6378137.0 298.257223563 DMP23_SSC.csv Table containing attribute information associated with the dataset Producer defined Sample_ID Sample identifier in XYY format where X identifies the data series (W for water sample) and YY indicates the number in the series. Identical Lab IDs indicates replicate samples processed by the sediment lab. Producer defined Unique identifier for samples; assigned in the sediment lab. Date_Collected Date in MM/DD/YYYY format of sample collection. Producer defined 08/10/2023 08/13/2024 Date in month/day/year format Time_UTC Time of sample collection, in hh:mm:ss format, Coordinated Universal Time (UTC) Producer defined 15:06:00 21:20:00 hours:minutes:seconds format, Coordinated Universal Time (UTC) Latitude Latitude of sample location in decimal degrees, north. Producer defined 37.57592 37.61126 Decimal degrees Longitude Longitude of sample location in decimal degrees, east. Producer defined -122.18533 -122.14645 Decimal degrees Sample_Height_MAB The height in meters above the seabed where sample collection occurred. MAB stands for Meters Above Bed. Producer defined 0.15 2.65 meters Method Method of sample collection. Producer defined pump Samples were collected using a peristaltic pump Producer defined Total_Depth_m Water depth in meters at time of sampling, determined from the ships echosounder. Producer defined 0.8 3.4 meters Aliquot_Volume_ml The volume of sample in milliliters used for the analysis. producer defined 80.0 250.0 milliliters Sediment_Weight_mg The weight of the dried sediment captured by the filter. producer defined 0.82 16.37 milligrams Suspended_Sediment_Concentration_mg/l The suspended sediment concentration in milligrams per liter from the sample. Calculated by dividing the dried sediment weight (in milligrams) by the liquid volume of sample filtered (in liters) to estimate the concentration of suspended sediments. producer defined 3.56 118.38 milligram per liter The first line of the csv file is a header line. U.S. Geological Survey U.S. Geological Survey - CMGDS mailing and physical

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Santa Cruz CA 95060 831-427-4747 pcmsc_data@usgs.gov These data are available in csv format (DMP23_SSC.csv) accompanied by CSDGM FGDC-compliant metadata. Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. comma-delimited text Microsoft Excel 2002 (12527.20988) 64-bit file contains the csv table No compression applied 0.0155 https://doi.org/10.5066/P14D723N Data can be downloaded using the Network_Resource_Name link and scrolling down to the Turbidity Data section. None. The data are available in comma-separated values (CSV) spreadsheet format. Text editing software can be used to open the file, as well as spreadsheet programs, such as Microsoft Excel. 20250820 PCMSC Science Data Coordinator U.S. Geological Survey, Pacific Coastal and Marine Science Center mailing and physical

2885 Mission Street

Santa Cruz CA 95060 United States 831-427-4747 pcmsc_data@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998