Samantha C. McGill Jessica R. Lacy 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 Bed sediment samples were collected from several sites within south San Francisco Bay, California, USA. Stations sampled were located within or adjacent to an area defined for strategic sediment placement. These stations were more specifically located either near instrumented stations where time-series data were collected, on/near a mound of placed sediment, or in a channel adjacent to an instrumented station. Time-series data are provided on the home page for this data release. Sediment samples were collected by ship-side push core sampling or subsampling a Gomex box corer with push cores. Push cores, which ranged in total length from 6 to 16 centimeters (cm), were sectioned by depth. The uppermost six sections from each core were 1 cm thick, and the following sections were 2 cm thick. Samples were analyzed for sediment properties including bulk density, particle size distribution, and percent carbon. The sediment properties measured in this study provide some insight on how the sediment bed where dredged material was placed changed over time. In addition, the sediment properties measured during this study such as grain-size and bulk density are the best predictors of sediment erodibility, a parameter required for numerical models of sediment transport in muddy systems. 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 20250210 ground condition at time samples were collected Complete None planned -122.21167 -122.14669 37.60643 37.57107 USGS Metadata Identifier USGS:906157c2-b9bb-4bf4-990c-c5a7ea8c8f87 ISO 19115 Topic Category oceans Data Categories for Marine Planning Substrate USGS Thesaurus sediment transport grain-size analysis push coring grab sampling sea-floor characteristics unconsolidated deposits sediment transport bulk density carbon Marine Realms Information Bank (MRIB) keywords Sediment 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 (GNIS) 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

2885 Mission Street

Santa Cruz CA 95060 831-427-4747 pcmsc_data@usgs.gov Beckman-Coulter 2011 Beckman-Coulter, 2011, Instructions for Use: LS 13 320 Laser Diffraction Particle Size Analyzer: Brea, Calif., Beckman-Coulter, 246 p. https://www.beckmancoulter.com/wsrportal/techdocs?docname=b05577ab.pdf Robert E. Carver 1971 Carver, R.E., 1971, Procedures in Sedimentary Petrology: Wiley Interscience, New York: 49-94. https://tamug-ir.tdl.org/handle/1969.3/21450 E.E. Collias M.R. Rona D.A. McManus J.S. Creager 1963 Collias, E.E., Rona, M.R., McManus, D.A., and Creager, J.S., 1963, Machine processing of geological data: Department of Oceanography, University of Washington, Technical Report No. 87, 119 p. https://apps.dtic.mil/sti/pdfs/AD0423746.pdf Edythe E. Engleman Larry L. Jackson Daniel R. Norton 1985 Engleman, E.E., Jackson, L.L., and Norton, D.R., 1985, Determination of carbonate carbon in geological materials by coulometric titration: Chemical Geology, v. 53, p. 125-128. https://doi.org/10.1016/0009-2541(85)90025-7 Robert Louis Folk 1974 Folk, R.L., 1974, Petrology of Sedimentary Rocks: Hemphill Publishing Co., Austin, TX, 182 p. https://tamug-ir.tdl.org/handle/1969.3/21435 Robert Louis Folk 1980 Folk, R.L., 1980, Petrology of Sedimentary Rocks: Hemphill Publishing Co., Austin, TX, 184 p. https://repositories.lib.utexas.edu/bitstream/handle/2152/22930/folkpetrology.pdf?sequence=3 Robert Louis Folk 1966 Folk, R. L.,1966, A review of grain-size parameters: Sedimentology, v. 6, p. 73-93. https://doi.org/10.1111/j.1365-3091.1966.tb01572.x Robert Louis Folk William C. Ward 1957 Folk, R.L., and Ward, W.C., 1957, Brazos River bar; a study in the significance of grain size parameters: Journal of Sedimentary Research, v. 27, p. 3-26. https://doi.org/10.1306/74D70646-2B21-11D7-8648000102C1865D Douglas Lamar Inman 1952 Inman, D.L., 1952, Measures for describing the size distribution of sediments: Journal of Sedimentary Research, v. 22, p. 125-145. https://doi.org/10.1306/D42694DB-2B26-11D7-8648000102C1865D J.M. Jaquet J.P. Vernet 1976 Jaquet J. M., and Vernet J.P., 1976, Moment and graphic size parameters in sediments of Lake Geneva (Switzerland): Journal of Sedimentary Petrology, v. 46, p. 305-312. https://doi.org/10.1306/212F6F46-2B24-11D7-8648000102C1865D Penscil Inc. 2015 Penscil Inc., 2015, pcSDSZ: Sediment Size Analysis Software for Windows Operation Manual Version 2.00, prepared for USGS Coastal and Marine Geology. Unpublished document. J. Syvitski 1991 Syvitski, J., 1991, Principles, Methods, and Applications of Particle Size Analysis: Cambridge University Press, New York, USA, 292 p. https://doi.org/10.1017/CBO9780511626142 Parker D. Trask 1930 Trask, P.D., 1930, Mechanical analyses of sediments by centrifuge: Economic Geology, v. 25, p. 581-599. https://doi.org/10.2113/gsecongeo.25.6.581 Parker D. Trask 1932 Trask, P.D., 1932, Origin and environment of source sediments of petroleum: Gulf Publishing Company, Houston, Texas, 323 p. https://www.cambridge.org/core/journals/journal-of-the-marine-biological-association-of-the-united-kingdom/article/abs/origin-and-environment-of-source-sediments-of-petroleum-by-d-trask-parker-assisted-by-harold-e-hammar-and-c-c-wu-gulf-publishing-co-houston-texas-323-pp-1932/E4212BACC9A798808CC166A1DE4CF691#article UIC Inc. 2022 UIC Inc., Operation Manual Model CM5017 CO2 Coulometer, Joliet, IL, 2.0, p. 28-30. UIC Inc. 2022 UIC Inc., Operation Manual Model CM5200 Autosampler Furnace, Joliet, IL, 2.4, 13 p. UIC Inc. 2022 UIC Inc., Operation Manual Model CM5230 Acidification Module, Joliet, IL, 2.1, p. 15-17. If present, large shells/clams/worms were physically removed from push core samples with minimal disturbance or loss of the sediment sample. Shell fragments greater than 1 millimeter(mm) visually identified, and separated from the sample using forceps, during the dry sieving process that is described in a process step below. For grain-size analyses, annual service tests and daily calibrations with reference standards ensure that the Beckman Coulter LS 13 320 operates within specifications. Each sample was analyzed three times by the UIC CM5017 coulometer and the data were averaged. In addition, a randomly selected lab procedural duplicate was run with each batch of samples to ensure consistency and that measured duplicate values were within 15 percent of the original values. Total carbon and total inorganic carbon values for each sample are the average of two measurements. Instruments used for carbon analyses: the UIC CM5017 coulometer, the CM5200 furnace, and the CM5230 acid digester were verified to be within specifications by running blanks and pure, reagent-grade calcium carbonate standard before and after every 10 samples. A single, lab procedural duplicate was run with each batch of 24 samples to ensure consistency, with measured duplicate values within 15 percent of the original values. Data values are within the expected values for bay sediments. Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the metadata record carefully for additional details. Push core samples were taken from a small vessel anchored at the sample location. Manufacturers stated accuracy from the least precise GPS equipment (small vessel GPS system) 3-5 meters (m). Sample depth is referenced to the surface of the sample or core, with a precision of up to 0.25 cm. Samantha C. McGill Rachel M. Allen Joanne C. Thede Andrew W. Stevens Peter Dartnell Jessica R. Lacy 2025 NetCDF files online U.S. Geological Survey https://doi.org/10.5066/P14D723N online database 20230814 20250210 ground condition at time data were collected Time series data Approximate salinity values. Data are available in the Mooring (physical oceanography) Data section of this same data release SEDIMENT COLLECTION. Sediment samples were collected at several stations in south San Francisco Bay, from a small vessel, using a custom build hand-operated push-core device that consisted of the push core “tube” secured onto a pole mount with an internal valve, the device was carefully lowered vertically off the side of the ship by hand, when the operator finished pushing the core into the bed, paracord attached to a lever on the value was pulled to close it, “capturing” the sediment, the device was carefully brought on deck and the core was dismounted and capped, this was repeated 3 times per station to obtain replicates. The two stations that were in and adjacent to the channel used a Gomex box corer that was then subsampled with three push cores (38 mm in diameter) when a sufficient amount of sediment was recovered. For each push core, the six uppermost subsamples were collected at 1 cm vertical intervals. The rest of the core was sampled at 2 cm intervals, except for two samples (P3B2-6 and P3B2-7), that were accidentally sampled at 2 and 1 cm intervals respectively. A couple of cores have a -1 cm sample depth, which means there was a feature protruding from what we defined as the sample’s (sediment bed's) surface, for example a small cluster of shells packed with mud protruding from the surface of the sample. Sediment samples were carefully extracted from cores by sliding core on top of an extruder, which pushed the sediment in the core upward, allowing us to section precise sample depths starting with the surface sample. Subsamples were placed into pre-weighed Whirl-pak bags. 20250210 A total of 687 samples were analyzed for bulk density by the USGS Pacific Coastal and Marine Science Center sediment lab. Dry bulk density was calculated with the formula: dry bulk density = (1 - porosity)* sediment density, where porosity is calculated as P = (water mass/water density)/[(water mass/water density)+(corrected dry sediment mass/sediment density)], water density is 1 g/cm3 and sediment density is 2.65 g/cm3. Local salinity readings were used to correct for the mass of salt in the pore water that was left behind during the drying process (salt mass = water mass * (salinity/1000)). The salt mass gets subtracted from dry sediment mass, to obtain the corrected dry sediment. Approximate salinity values were obtained from nearby time-series station that were deployed as part of this project or from USGS station 11162765 when no time-series station were available. The time-series data are available on this data releases' landing page. Time series data 20250226 GRAIN-SIZE ANALYSIS: A total of 438 samples (including occasional duplicates) were analyzed for grain-size. Grain-size analysis was conducted by the USGS Pacific Coastal and Marine Science Center (PCMSC) sediment lab using a Beckman Coulter LS 13 320 grain-size analyzer with an aqueous liquid module attachment. PCMSC procedures are modified from those described in Carver (1971) and Folk (1974, 1980). 5-50 grams of sediment was sub-sampled and at least 10 milliliters of 30 percent hydrogen peroxide was added and left for approximately 12 hours to remove organics. The samples were then heated to 250 degrees Celsius to remove excess hydrogen peroxide. Next, samples were placed in an ultrasonic bath to help disperse silt and clay (mud) from sand and larger-sized particles. Samples were then rinsed twice in deionized water with centrifugation to remove soluble ions. Subsequently, the samples were wet sieved with 1 millimeter and 0.063 millimeter sieves to segregate the combined gravel and coarse sand fraction (greater than 1 millimeter), sand (1 millimeter to 0.063 millimeter), and mud (less than 0.063 millimeter). Shells > 1 mm were visually identified and removed using forceps, during the sieving process, dried, and weighed. The coarse sand + gravel fractions were then dried, dry sieved at 1/4 phi intervals and weighed (Carver, 1971). The sand fraction was dried and weighed. The mud fraction was collected in a 1 liter graduated cylinder, 5 milliliters of at least 10 percent sodium hexametaphosphate (dispersant) was added, and deionized water was added to bring the total the volume to 1 liter. The mud + dispersant solution sat overnight to ensure complete dispersion and to observe if flocculation occurred. Subsequently, a 20 milliliter aliquot was extracted from the graduated cylinder and dried to obtain the mud fraction weight normalized to a 1-liter basis. The mud and sand fractions were analyzed separately via the Beckman Coulter LS 13 320 with the aqueous liquid module attachment. All size fraction data were compiled and converted by the PCMSC sediment lab pcSDSZ program (Penscil, 2015) to a grain-size distribution at 1/4 phi size intervals on a weight percent basis. pcSDSZ also calculated interpolated sizes and graphical statistics on a percent coarser basis (Folk and Ward, 1957; Folk, 1966; Folk, 1974, 1980; Inman, 1952; Trask, 1930, 1932) and moment measures (Collias and others, 1963; Jaquet and Vernet, 1976; Folk, 1980). 20250501 INTERPOLATED SIZES: Grain-sizes at select cumulative percentage values (D) were calculated by the PCMSC Sediment Lab software pcSDSZ version 1.71 on a percent coarser basis, which summed from coarse to fine bins. D values were interpolated between phi bins bracketing the specified D value. Grain-sizes were converted into units of millimeters (mm) using the formula mm=reciprocal of 2(exponent) phi or (phi=-log2(mm)). Interpolated grain-sizes at D50 are reported in phi and millimeter units. 20250501 CARBON ANALYSIS: A total of 202 (including occasional duplicates) samples were analyzed for percent carbon. Carbon analysis was performed by the PCMSC carbon lab employing a coulometric titration technique described in Engleman and others (1985) and UIC operating manuals for the UIC CM5200 autosampler furnace, the UIC CM5230 acidification module, and the UIC CM5017 coulometer. Total carbon (TC), total inorganic carbon (TIC), total organic carbon (TOC) and percent calcium carbonate (CaCO3) are reported as percent dry weight. Approximately 5 grams of sediment were dried in an 80 degrees Celsius oven. Samples were then pulverized, redried, and placed in a desiccator. For TC analysis, approximately 20 milligrams of the pulverized sample were weighed and wrapped in an aluminum capsule then combusted at 950 degrees Celsius in an UIC CM5200 autosampler furnace attached to an UIC CM5017 coulometer. The carbon dioxide (CO2) produced by combusting the sample was then converted to TC by the UIC CM5017 coulometer. For TIC, approximately 20 milligrams of sample were weighed and loaded into an UIC CM5230 acidification module attached to an UIC CM5017 coulometer. The samples were then digested in a perchloric acid solution, and the CO2 generated was measured and converted to TIC. Two analyses per sample were run and the results were averaged. TOC was calculated by subtracting TIC from TC. The TIC value was then multiplied by 8.333 (the molar stochiometric ratio of CaCO3 to C) to convert TIC to percent CaCO3. 20241008 Angela Tan USGS Physical Scientist mailing and physical

2885 Mission Street

Santa Cruz CA 95060 831-460-7409 atan@usgs.gov Data were collected in San Francisco Bay, California Point Point 712 1.0E-5 1.0E-5 Decimal degrees World Geodetic System 1984 (WGS84) WGS84 6378137.0 298.257223563 DMP23_sediment_properties.csv Table containing attribute information associated with the dataset Producer defined Sample_ID Name of sample producer defined Sample identifier, sample IDs that begin with a “P” are from stations located within a dredged material placement region. All other sample IDs begin with the first two letters of a corresponding time series station, with the exception of the set of cores from a channel that begin with “CN”. Date_Collected Date in MM/DD/YYYY format of sample collection. producer defined 08/10/2023 02/10/2025 month/day/year Time_UTC Time of sample collection, in hh:mm format, Coordinated Universal Time (UTC) producer defined 15:11 20:02 hours:minutes:seconds format, Coordinated Universal Time (UTC) Latitude Latitude of collection producer defined 37.57107 37.60643 decimal degrees Longitude Longitude of sample producer defined -122.21167 -122.14669 decimal degrees Sample_Depth_cm The down-core depth of the bottom of the sectioned sampled, where 0 is the surface of the sediment bed. producer defined -1 16 centimeter Section_Thickness_cm The thickness (vertical) of the sediment interval. producer defined 1.0 2.0 centimeter Type Type of sample producer defined Sediment Sediment core acquired by hand. producer defined -4.00phi_16mm Weight percent of sample with particle diameter greater than -4.00 phi, or 16 mm, -999 indicates that no value was calculated. producer defined 0.00 0.00 percentage -3.75phi_13.5mm Weight percent of sample with particle diameter between -4.00 and -3.75 phi, or 13.5 and 16 mm, -999 indicates that no value was calculated. producer defined 0.00 0.00 percentage -3.50phi_11.2mm Weight percent of sample with particle diameter between -3.75 and -3.50 phi, or 11.2 and 13.5 mm, -999 indicates that no value was calculated. producer defined 0.00 0.00 percentage -3.25phi_9.51mm Weight percent of sample with particle diameter between -3.50 and -3.25 phi, or 9.51 and 11.2 mm, -999 indicates that no value was calculated. producer defined 0.00 0.00 percentage -3.00phi_8mm Weight percent of sample with particle diameter between -3.25 and -3.00 phi, or 8 and 9.51 mm, -999 indicates that no value was calculated. producer defined 0.00 0.00 percentage -2.75phi_6.73mm Weight percent of sample with particle diameter between -3.00 and -2.75 phi, or 6.73 and 8 mm, -999 indicates that no value was calculated. producer defined 0.00 0.00 percentage -2.50phi_5.66mm Weight percent of sample with particle diameter between -2.75 and -2.50 phi, or 5.66 and 6.73 mm, -999 indicates that no value was calculated. producer defined 0.00 0.00 percentage -2.25phi_4.76mm Weight percent of sample with particle diameter between -2.50 and -2.25 phi, or 4.76 and 5.66 mm, -999 indicates that no value was calculated. producer defined 0.00 0.00 percentage -2.00phi_4mm Weight percent of sample with particle diameter between -2.25 and -2.00 phi, or 4 and 4.76 mm, -999 indicates that no value was calculated. producer defined 0.00 0.00 percentage -1.75phi_3.36mm Weight percent of sample with particle diameter between -2.00 and -1.75 phi, or 3.36 and 4 mm, -999 indicates that no value was calculated. producer defined 0.00 0.00 percentage -1.50phi_2.83mm Weight percent of sample with particle diameter between -1.75 and -1.50 phi, or 2.83 and 3.36 mm, -999 indicates that no value was calculated. producer defined 0.00 0.00 percentage -1.25phi_2.38mm Weight percent of sample with particle diameter between -1.50 and -1.25 phi, or 2.38 and 2.83 mm, -999 indicates that no value was calculated. producer defined 0.00 0.00 percentage -1.00phi_2mm Weight percent of sample with particle diameter between -1.25 and -1.00 phi, or 2 and 2.38 mm, -999 indicates that no value was calculated. producer defined 0.00 0.00 percentage -0.75phi_1.68mm Weight percent of sample with particle diameter between -1.00 and -0.75 phi, or 1.68 and 2 mm, -999 indicates that no value was calculated. producer defined 0.00 4.23 percentage -0.50phi_1.41mm Weight percent of sample with particle diameter between -0.75 and -0.50 phi, or 1.41 and 1.68 mm, -999 indicates that no value was calculated. producer defined 0.00 2.69 percentage -0.25phi_1.19mm Weight percent of sample with particle diameter between -0.50 and -0.25 phi, or 1.19 and 1.41 mm, -999 indicates that no value was calculated. producer defined 0.00 2.67 percentage 0.00phi_1mm Weight percent of sample with particle diameter between -0.25 and 0.00 phi, or 1 and 1.19 mm, -999 indicates that no value was calculated. producer defined 0.00 2.74 percentage 0.25phi_0.8409mm Weight percent of sample with particle diameter between 0.00 and 0.25 phi, or 0.8409 and 1 mm, -999 indicates that no value was calculated. producer defined 0.00 2.76 percentage 0.50phi_0.7071mm Weight percent of sample with particle diameter between 0.25 and 0.50 phi, or 0.7071 and 0.8409 mm, -999 indicates that no value was calculated. producer defined 0.00 2.64 percentage 0.75phi_0.5946mm Weight percent of sample with particle diameter between 0.50 and 0.75 phi, or 0.5946 and 0.7071 mm, -999 indicates that no value was calculated. producer defined 0.00 2.41 percentage 1.00phi_0.5mm Weight percent of sample with particle diameter between 0.75 and 1.00 phi, or 0.5 and 0.5946 mm, -999 indicates that no value was calculated. producer defined 0.00 2.11 percentage 1.25phi_0.4204mm Weight percent of sample with particle diameter between 1.00 and 1.25 phi, or 0.4204 and 0.5 mm, -999 indicates that no value was calculated. producer defined 0.00 2.79 percentage 1.50phi_0.3536mm Weight percent of sample with particle diameter between 1.25 and 1.50 phi, or 0.3536 and 0.4204 mm, -999 indicates that no value was calculated. producer defined 0.00 4.28 percentage 1.75phi_0.2973mm Weight percent of sample with particle diameter between 1.50 and 1.75 phi, or 0.2973 and 0.3536 mm, -999 indicates that no value was calculated. producer defined 0.00 6.21 percentage 2.00phi_0.25mm Weight percent of sample with particle diameter between 1.75 and 2.00 phi, or 0.25 and 0.2973 mm, -999 indicates that no value was calculated. producer defined 0.00 8.12 percentage 2.25phi_0.2102mm Weight percent of sample with particle diameter between 2.00 and 2.25 phi, or 0.2102 and 0.25 mm, -999 indicates that no value was calculated. producer defined 0.00 10.17 percentage 2.50phi_0.1768mm Weight percent of sample with particle diameter between 2.25 and 2.50 phi, or 0.1768 and 0.2102 mm, -999 indicates that no value was calculated. producer defined 0.00 11.97 percentage 2.75phi_0.1487mm Weight percent of sample with particle diameter between 2.50 and 2.75 phi, or 0.1487 and 0.1768 mm, -999 indicates that no value was calculated. producer defined 0.02 14.13 percentage 3.00phi_0.125mm Weight percent of sample with particle diameter between 2.75 and 3.00 phi, or 0.125 and 0.1487 mm, -999 indicates that no value was calculated. producer defined 0.03 15.43 percentage 3.25phi_0.1051mm Weight percent of sample with particle diameter between 3.00 and 3.25 phi, or 0.1051 and 0.125 mm, -999 indicates that no value was calculated. producer defined 0.05 12.73 percentage 3.50phi_0.088388mm Weight percent of sample with particle diameter between 3.25 and 3.50 phi, or 0.08839 and 0.1051 mm, -999 indicates that no value was calculated. producer defined 0.10 8.19 percentage 3.75phi_0.074325mm Weight percent of sample with particle diameter between 3.50 and 3.75 phi, or 0.07433 and 0.08839 mm, -999 indicates that no value was calculated. producer defined 0.29 4.54 percentage 4.00phi_0.0625mm Weight percent of sample with particle diameter between 3.75 and 4.00 phi, or 0.0625 and 0.07433 mm, -999 indicates that no value was calculated. producer defined 0.67 4.39 percentage 4.25phi_0.052556mm Weight percent of sample with particle diameter between 4.00 and 4.25 phi, or 0.052556 and 0.0625 mm, -999 indicates that no value was calculated. producer defined 1.15 5.01 percentage 4.50phi_0.044194mm Weight percent of sample with particle diameter between 4.25 and 4.50 phi, or 0.044194 and 0.052556 mm, -999 indicates that no value was calculated. producer defined 1.42 5.51 percentage 4.75phi_0.037163mm Weight percent of sample with particle diameter between 4.50 and 4.75 phi, or 0.037163 and 0.044194 mm, -999 indicates that no value was calculated. producer defined 1.40 5.55 percentage 5.00phi_0.03125mm Weight percent of sample with particle diameter between 4.75 and 5.00 phi, or 0.03125 and 0.037163 mm, -999 indicates that no value was calculated. producer defined 1.33 5.18 percentage 5.25phi_0.026278mm Weight percent of sample with particle diameter between 5.00 and 5.25 phi, or 0.02628 and 0.03125 mm, -999 indicates that no value was calculated. producer defined 1.15 4.74 percentage 5.50phi_0.022097mm Weight percent of sample with particle diameter between 5.25 and 5.50 phi, or 0.0221 and 0.02628 mm, -999 indicates that no value was calculated. producer defined 0.95 4.41 percentage 5.75phi_0.018581mm Weight percent of sample with particle diameter between 5.50 and 5.75 phi, or 0.01858 and 0.0221 mm, -999 indicates that no value was calculated. producer defined 0.79 4.19 percentage 6.00phi_0.015625mm Weight percent of sample with particle diameter between 5.75 and 6.00 phi, or 0.01563 and 0.01858 mm, -999 indicates that no value was calculated. producer defined 0.68 3.87 percentage 6.25phi_0.013139mm Weight percent of sample with particle diameter between 6.00 and 6.25 phi, or 0.01314 and 0.01563 mm, -999 indicates that no value was calculated. producer defined 0.65 4.00 percentage 6.50phi_0.011049mm Weight percent of sample with particle diameter between 6.25 and 6.50 phi, or 0.01105 and 0.01314 mm, -999 indicates that no value was calculated. producer defined 0.65 4.24 percentage 6.75phi_0.009291mm Weight percent of sample with particle diameter between 6.50 and 6.75 phi, or 0.00929 and 0.01105 mm, -999 indicates that no value was calculated. producer defined 0.67 4.46 percentage 7.00phi_0.007813mm Weight percent of sample with particle diameter between 6.75 and 7.00 phi, or 0.00781 and 0.00929 mm, -999 indicates that no value was calculated. producer defined 0.69 4.70 percentage 7.25phi_0.00657mm Weight percent of sample with particle diameter between 7.00 and 7.25 phi, or 0.00657 and 0.00781 mm, -999 indicates that no value was calculated. producer defined 0.70 4.93 percentage 7.50phi_0.005524mm Weight percent of sample with particle diameter between 7.25 and 7.50 phi, or 0.00552 and 0.00657 mm, -999 indicates that no value was calculated. producer defined 0.71 5.16 percentage 7.75phi_0.004645mm Weight percent of sample with particle diameter between 7.50 and 7.75 phi, or 0.00465 and 0.00552 mm, -999 indicates that no value was calculated. producer defined 0.69 5.16 percentage 8.00phi_0.003906mm Weight percent of sample with particle diameter between 7.75 and 8.00 phi, or 0.00391 and 0.00465 mm, -999 indicates that no value was calculated. producer defined 0.67 5.13 percentage 8.25phi_0.003285mm Weight percent of sample with particle diameter between 8.00 and 8.25 phi, or 0.00329 and 0.00391 mm, -999 indicates that no value was calculated. producer defined 0.66 4.91 percentage 8.50phi_0.002762mm Weight percent of sample with particle diameter between 8.25 and 8.50 phi, or 0.00276 and 0.00329 mm, -999 indicates that no value was calculated. producer defined 0.62 4.46 percentage 8.75phi_0.002323mm Weight percent of sample with particle diameter between 8.50 and 8.75 phi, or 0.00232 and 0.00276 mm, -999 indicates that no value was calculated. producer defined 0.60 4.11 percentage 9.00phi_0.001953mm Weight percent of sample with particle diameter between 8.75 and 9.00 phi, or 0.00195 and 0.00232 mm, -999 indicates that no value was calculated. producer defined 0.59 3.79 percentage 9.25phi_0.001642mm Weight percent of sample with particle diameter between 9.00 and 9.25 phi, or 0.00164 and 0.00195 mm, -999 indicates that no value was calculated. producer defined 0.58 3.57 percentage 9.50phi_0.001381mm Weight percent of sample with particle diameter between 9.25 and 9.50 phi, or 0.00138 and 0.00164 mm, -999 indicates that no value was calculated. producer defined 0.57 3.48 percentage 9.75phi_0.001161mm Weight percent of sample with particle diameter between 9.50 and 9.75 phi, or 0.00116 and 0.00138 mm, -999 indicates that no value was calculated. producer defined 0.57 3.44 percentage 9.99phi_0.000983mm Weight percent of sample with particle diameter between 9.75 and 9.99 phi, or 0.00098 and 0.00116 mm, -999 indicates that no value was calculated. producer defined 0.52 3.22 percentage 10.25phi_0.000821mm Weight percent of sample with particle diameter between 9.99 and 10.25 phi, or 0.00082 and 0.00098 mm, -999 indicates that no value was calculated. producer defined 0.50 3.17 percentage 10.50phi_0.000691mm Weight percent of sample with particle diameter between 10.25 and 10.50 phi, or 0.00069 and 0.00082 mm, -999 indicates that no value was calculated. producer defined 0.42 2.69 percentage 10.75phi_0.000581mm Weight percent of sample with particle diameter between 10.50 and 10.75 phi, or 0.00058 and 0.00069 mm, -999 indicates that no value was calculated. producer defined 0.34 2.20 percentage 10.99phi_0.000492mm Weight percent of sample with particle diameter between 10.75 and 10.99 phi, or 0.00049 and 0.00058 mm, -999 indicates that no value was calculated. producer defined 0.24 1.56 percentage 11.25phi_0.000411mm Weight percent of sample with particle diameter between 10.99 and 11.25 phi, or 0.0004 and 0.00049 mm, -999 indicates that no value was calculated. producer defined 0.14 0.89 percentage 11.48phi_0.00035mm Weight percent of sample with particle diameter between 11.25 and 11.48 phi, or 0.00035 and 0.0004 mm, which is the lowest measurable size for the coulter, -999 indicates that no value was calculated. producer defined 0.03 0.21 percentage Shell_Subsample_Weight_g The weight of shells > 1 mm that were sieved from the subsample used for obtaining percent size weights, -999 indicates that no value was calculated. producer defined 0.00 5.61 grams NoShell_Subsample_Weight_g The weight of the subsample post removing shells > 1 mm, this sample was used for obtaining percent size weights, -999 indicates that no value was calculated. producer defined 1.89 19.52 grams Percent_Gravel Percent of sample greater than 2 mm, -999 indicates that no value was calculated. Producer defined 0.00 0.00 Percentage Percent_Sand Percent of sample less than 2 mm and greater than 63 microns, -999 indicates that no value was calculated. Producer defined 1.17 76.49 Percentage Percent_Silt Percent of sample less than 63 microns and greater than 4 microns, -999 indicates that no value was calculated. Producer defined 17.13 63.51 Percentage Percent_Clay Percent of sample less than 4 microns, -999 indicates that no value was calculated. Producer defined 6.37 40.70 Percentage Percent_Mud Percent of sample less than 63 microns, -999 indicates that no value was calculated. Producer defined 23.51 98.83 Percentage Gravel_to_Sand_ratio ratio of percent sand in sample to percent silt, -999 indicates that no value was calculated. producer defined 0.00 0.00 dimensionless Sand_to_Silt_ratio ratio of percent sand in sample to percent silt, -999 indicates that no value was calculated. producer defined 0.02 4.46 dimensionless Silt_to_Clay_ratio ratio of percent silt in sample to percent clay, -999 indicates that no value was calculated. producer defined 1.42 2.69 dimensionless Sand_to_Clay_ratio ratio of percent sand in sample to percent clay, -999 indicates that no value was calculated. producer defined 0.03 12.01 dimensionless Sand_to_Mud_ratio ratio of percent sand in sample to percent mud, -999 indicates that no value was calculated. producer defined 0.01 3.25 dimensionless Gravel_to_Mud_ratio ratio of percent gravel in sample to percent mud, -999 indicates that no value was calculated. producer defined 0.00 0.00 dimensionless D50_percent_coarser_in_phi mm size at D50 in percent coarser, -999 indicates that no value was calculated. Producer defined 2.69 7.52 Phi size D50_percent_coarser_in_mm The particle size in mm at which 50 percent of the distribution is coarser. -999 indicates that no value was calculated. Producer defined 0.01 0.15 millimeters Folk_Ward_Median_percent_coarser Phi size median for sample by Folk and Ward (1957) method, -999 indicates that no value was calculated. producer defined 2.69 7.52 Phi size Folk_Ward_Mean_percent_coarser Phi size mean for sample by Folk and Ward (1957) method, -999 indicates that no value was calculated. producer defined 3.37 7.53 Phi size Inman_Median_percent_coarser Phi size median for sample by Inman (1952) method, -999 indicates that no value was calculated. producer defined 2.69 7.52 Phi size Inman_Mean_percent_coarser Phi size mean for sample by Inman (1952) method, -999 indicates that no value was calculated. producer defined 3.59 7.53 Phi size Trask_Median_percent_coarser mm size median for sample by Trask (1930) method in mm, -999 indicates that no value was calculated. producer defined 0.01 0.15 millimeters Trask_Mean_percent_coarser mm size mean for sample by Trask (1930) method in mm, -999 indicates that no value was calculated. producer defined 0.01 0.15 millimeters 1_Moment_Mean_Phi phi size mean for sample, -999 indicates that no value was calculated. producer defined 3.49 7.52 Phi size 1_Moment_Mean_mm mm size mean for sample, -999 indicates that no value was calculated. producer defined 0.01 0.09 millimeters 2_Moment_Variance Variance for sample, -999 indicates that no value was calculated. producer defined 3.38 11.73 dimensionless 2_Moment_Standard_Deviation Standard Deviation for sample, -999 indicates that no value was calculated. producer defined 1.84 3.42 Phi size Bag_Weight_g The weight of the empty sample bag. -999 indicates that no value was measured. producer defined 3.24 5.05 grams Bag_and_Wet_Sediment_Weight_g The weight of the initial wet sample, as it was collected in the sample bag. -999 indicates that no value was measured. producer defined 15.27 86.62 grams Bag_and_Dry_Sediment_Weight_g The weight of the dry sample including the weight of its sample bag. -999 indicates that no value was measured. producer defined 7.77 49.11 grams Dry_Sediment_Weight_g The weight of the dried sediment in the sample. -999 indicates that no value was measured. producer defined 4.51 44.23 grams Water_Weight_g The weight of the water from the sample. -999 indicates that no value was calculated. producer defined 7.50 45.46 grams Approximate_Salinity_PSU The approximate salinity in Practical Salinity Units (PSU), used to calculate the dry bulk density value. -999 indicates that no value was calculated. producer defined 18 26 pratical salinity units (PSU) Dry_Bulk_Density_g/cm^3 The dry bulk density of the sample, calculated as: (1-porosity) * sediment density, where porosity (P) is calculated as P = (water mass/water density)/[(water mass/water density)+(corrected dry sediment mass/sediment density)], water density is 1 g/cm3, sediment density is 2.65 g/cm3, and corrected dry sediment mass is dry sediment mass minus the mass of salt in the pore water. Local salinity readings were used to obtain the mass of salt in the pore water that was left behind during the drying process as: salt mass = water mass * (salinity/1000), -999 indicates that no value was calculated. producer defined 0.22 1.39 grams per cubic centimeter Percent_Total_Carbon total weight percentage of carbon, -999 indicates that no value was calculated. producer defined 0.68 7.52 percentage Percent_Total_Organic_Carbon total weight percentage of organic carbon, -999 indicates that no value was calculated. producer defined 0.03 2.74 percentage Percent_Total_Inorganic_Carbon total weight percentage of inorganic carbon, -999 indicates that no value was calculated. producer defined 0.04 7.10 percentage Percent_Calcium_Carbonate weight percentage of calcium carbonate, -999 indicates that no value was calculated. producer defined 0.37 59.16 percentage 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 Sediment particle size, bulk density, and percent carbon data are available as a comma-delimited text file (DMP23_sediment_properties.csv), along with associated 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 for Microsoft 365 MSO version 2208 comma-delimited text file No compression applied 0.3593 https://doi.org/10.5066/P14D723N/ Data can be downloaded using the Network_Resource_Name link and scrolling down to the Sediment Properties Data section. None 20250820 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