Joanne C. T. Ferreira Daniel J. Nowacki 20240711 CSV format tabular data data release DOI:10.5066/P15AORBR Pacific Coastal and Marine Science Center, Santa Cruz, California U.S. Geological Survey https://doi.org/10.5066/P15AORBR Joanne C. T. Ferreira Daniel J. Nowacki SeanPaul M. La Selle 2024 data release DOI:10.5066/P15AORBR Pacific Coastal and Marine Science Center, Santa Cruz, CA U.S. Geological Survey Suggested Citation: Ferreira, J.C.T., Nowacki, D.J., and La Selle, S.M., 2024, Sediment core data collected from Cargill Marsh, South San Francisco Bay, California during field activities 2022-643-FA and 2023-681-FA: U.S. Geological Survey data release, https://doi.org/10.5066/P15AORBR. https://doi.org/10.5066/P15AORBR This dataset presents specific activities of cesium-137 in picoCuries per gram from sediment cores collected from Cargill Marsh, South San Francisco Bay, California on June 21, 2022, and December 14, 2023. The cores were collected with hand driven push cores to assess sediment accumulation on the marsh. Laboratory measurements of cesium isotope concentrations in Cargill Marsh, South San Francisco Bay, California, to characterize marsh sedimentation history. Cores were collected, analyzed, and archived by USGS, Pacific Coastal and Marine Science Center. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Information about the data collection field activities can be found at: http://cmgds.marine.usgs.gov/fan_info.php?fan=2022-643-FA http://cmgds.marine.usgs.gov/fan_info.php?fan=2023-681-FA 20220621 20231214 Ground conditions at time data were collected Complete None planned -122.13863 -122.13845 37.59074 37.58864 USGS Metadata Identifier USGS:8ef16080-2d6a-4656-979a-3720f6643670 ISO 19115 Topic Category oceans geoscientificInformation USGS Thesaurus core analysis ocean processes sediment transport geospatial datasets Data Categories for Marine Planning substrate Marine Realms Information Bank (MRIB) keywords sediment None U.S. Geological Survey USGS Coastal and Marine Hazards and Resources Program CMHRP Pacific Coastal and Marine Science Center PCMSC Department of the Interior DOI field activity number 2022-643-FA field activity number 2023-681-FA cesium-137 dating Geographic Names Information System (GNIS) Alameda County San Francisco Bay State of California None Cargill Marsh Whale's Tail marsh Whale's Tail South marsh Eden Landing Ecological Reserve No access constraints. Please see 'Distribution Info' for details. 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 as the originator(s) of the dataset and in products derived from these data. PCMSC Science Data Coordinator U.S. Geological Survey, Pacific Coastal and Marine Science Center mailing and physical

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Santa Cruz CA 95060 831-427-4747 pcmsc_data@usgs.gov cargill_cores_overview.png Side by side comparison of depth referenced linescan images, color-enhanced CT images, and plots of Cesium-137 isotope activity for all cores. PNG Joanne C. T. Ferreira Daniel J. Nowacki 2024 Core location information for these CS-137 measurements have been published in a separate section in this data release https://doi.org/10.5066/P15AORBR Joanne C. T. Ferreira Jessica R. Lacy Samantha C. McGill Lukas T. WinklerPrins Daniel J. Nowacki Andrew W. Stevens Angela C. Tan 2023 https://doi.org/10.5066/P972R6AW Quality control of attribute accuracy was conducted during field data collection and processing workflows. No formal attribute accuracy tests were conducted. No formal logical consistency tests were conducted. 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. A RTK GPS system was used for obtaining latitude and longitude point locations during the field activity with centimeter accuracy. As each core site required two adjacent cores to complete the 90 cm length, the horizontal position accuracy of 50 cm is reasonable. Core depth values are relative to the top of sediment surface at the time of core collection. Coring-induced compaction, if any, was not determined. No formal vertical accuracy tests were conducted. Sediment cores were collected from the marsh environment on Cargill Marsh in Eden Landing Environmental Reserve, Alameda County, California using a Russian corer (a hand-held, side-filling peat auger). At each core site, two adjacent cores holes were used to sample sediment in 50 cm intervals with a 10 cm overlapping section resulting in undisturbed sediment cores of 90 cm length. Cores were transported back to the USGS Pacific Coastal and Marine Science Center for imaging, and subsequently sectioned in two cm samples for Cesium-137 analyses. Not all segments of the cores were analyzed. 2023 Radionuclide activities: Prior to quantification of short-lived radionuclide activities, bulk sediment was oven-dried at 60 degrees Celsius, ground by hand in a mortar and pestle and packed into 10 milliliter graduated polystyrene vials. Vials were capped and sealed to prevent gas exchange, then left to equilibrate for at least 21 days. Samples and reference materials with the same geometry were counted for 24 hours in a high purity, low background germanium (HPGe) well detector at the USGS PCMSC Radiochemistry Lab. Cesium-137 activities were counted at 661 kiloelectron volts (keV). 2023 Point Point 64 0.00001 0.00001 Decimal degrees WGS_1984 WGS_1984 6378137.0 298.2572236 Local surface 1.0 centimeters Attribute values 2022-643-FA_CAR-RC02.csv, 2023-681-FA_CAR-RC03.csv, 2023-681-FA_CAR-RC04.csv Comma separated value text file with core identifier in the title containing location within the core of each 2 cm thick sample and the values of cesium 137 activity and uncertainty. Producer defined top_depth_cm depth at top of sample with reference to the surface producer defined 0 95 centimeters bottom_depth_cm depth at bottom of sample with reference to the surface producer defined 2 97 centimeters Midpoint_depth_cm midpoint depth of sample with reference to the surface producer defined 1 96 centimeters 137Cs_activity_dpm_per_g Activity of Cesium-137 Producer defined 0.00 0.44 disintegrations per minute per gram (dpm per g) 0.01 137Cs_uncertainty_dpm_per_g Measurement uncertainty of Cesium-137 activity at the 99.7 percent confidence interval estimated from: detector efficiency, background correction, and three standard deviations of the counting error; -9999 is assigned when no activity was measured. Producer defined 0.00 0.21 disintegrations per minute per gram (dpm per g) 0.01 The first line of the csv file is a header line. Producer defined U.S. Geological Survey - CMGDS mailing address

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Santa Cruz CA Santa Cruz United States 831-427-4747 pcmsc_data@usgs.gov Cesium 137 measurement information is provided in comma separated value (CSV) text files. File names correspond to the names of the cores within each scan. For example, ‘2022-643-FA_CAR-RC02_137Cs.csv' corresponds core segments collected during field activity 2022-643-FA,'CAR' refers to the Cargill Marsh, 'RC02' to the core location within the marsh and '_137Cs' indicates the file contains measurements of cesium 137 activity. Location information for these cores are available in a separate section of this data release. 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 2024 File contains table in .csv format No compression applied 0.001 https://doi.org/10.5066/P15AORBR Data can be downloaded using the Network_Resource_Name link and scrolling to files in the Environmental Data section. None. CSV files can be viewed with any standard table editing software (for example, excel, numbers). 20240711 U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

2885 Mission Street

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