Suspended sediment concentrations from water samples collected in south San Francisco Bay, California, 2023-2024

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator: Samantha C. McGill
Originator: Angela C. Tan
Publication_Date: 20250820
Title:
Suspended sediment concentrations from water samples collected in south San Francisco Bay, California, 2023-2024
Geospatial_Data_Presentation_Form: Comma-separated values
Series_Information:
Series_Name: data release
Issue_Identification: DOI:10.5066/P14D723N
Publication_Information:
Publication_Place:
Pacific Coastal and Marine Science Center, Santa Cruz, California
Publisher: U.S. Geological Survey
Online_Linkage: https://doi.org/10.5066/P14D723N
Larger_Work_Citation:
Citation_Information:
Originator: Samantha C. McGill
Originator: Jessica R. Lacy
Originator: Andrew W. Stevens
Originator: Rachel M. Allen
Originator: Peter Dartnell
Originator: Joanne C. Thede
Originator: Angela C. Tan
Originator: Gerald A. Hatcher
Publication_Date: 2025
Title:
Oceanographic and hydrographic monitoring data of a shallow-water placement of dredged sediment in south San Francisco Bay, California, 2023-2025
Series_Information:
Series_Name: data release
Issue_Identification: DOI:10.5066/P14D723N
Publication_Information:
Publication_Place:
Pacific Coastal and Marine Science Center, Santa Cruz, California
Publisher: U.S. Geological Survey
Other_Citation_Details:
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.
Online_Linkage: https://doi.org/10.5066/P14D723N
Description:
Abstract:
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.
Purpose:
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.
Supplemental_Information:
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.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 20230810
Ending_Date: 20240813
Currentness_Reference: ground condition at time sample was collected
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -122.18533
East_Bounding_Coordinate: -122.14645
North_Bounding_Coordinate: 37.61126
South_Bounding_Coordinate: 37.57592
Keywords:
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:a93a2185-c583-44d4-8a89-af66789dea86
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: oceans
Theme:
Theme_Keyword_Thesaurus: Data Categories for Marine Planning
Theme_Keyword: Water-Quality Parameters
Theme:
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: suspended material (water)
Theme_Keyword: field sampling
Theme_Keyword: water sampling
Theme_Keyword: marine water quality
Theme_Keyword: suspended material (water)
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: USGS
Theme_Keyword: U.S. Geological Survey
Theme_Keyword: PCMSC
Theme_Keyword: Pacific Coastal and Marine Science Center
Theme_Keyword: CMHRP
Theme_Keyword: Coastal and Marine Hazards and Resources Program
Place:
Place_Keyword_Thesaurus: Geographic Names Information System
Place_Keyword: San Francisco Bay
Place_Keyword: State of California
Place:
Place_Keyword_Thesaurus: none
Place_Keyword: South San Francisco Bay
Place_Keyword: Eden Landing Ecological Reserve
Access_Constraints: No access constraints
Use_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.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Contact_Person: PCMSC Science Data Coordinator
Contact_Address:
Address_Type: mailing and physical
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060
Contact_Voice_Telephone: 831-460-4747
Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
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.
Logical_Consistency_Report:
Data values are within the expected values for suspended sediment in south San Francisco Bay.
Completeness_Report:
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.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
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.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
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.
Lineage:
Process_Step:
Process_Description:
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.
Process_Date: 20240813
Process_Step:
Process_Description:
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.
Process_Date: 20240819
Spatial_Data_Organization_Information:
Indirect_Spatial_Reference: Data were collected in San Francisco Bay, California
Direct_Spatial_Reference_Method: Point
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Point
Point_and_Vector_Object_Count: 220
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 1.0E-5
Longitude_Resolution: 1.0E-5
Geographic_Coordinate_Units: Decimal degrees
Geodetic_Model:
Horizontal_Datum_Name: World Geodetic System 1984 (WGS84)
Ellipsoid_Name: WGS84
Semi-major_Axis: 6378137.0
Denominator_of_Flattening_Ratio: 298.257223563
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: DMP23_SSC.csv
Entity_Type_Definition:
Table containing attribute information associated with the dataset
Entity_Type_Definition_Source: Producer defined
Attribute:
Attribute_Label: Sample_ID
Attribute_Definition:
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.
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:
Unrepresentable_Domain: Unique identifier for samples; assigned in the sediment lab.
Attribute:
Attribute_Label: Date_Collected
Attribute_Definition: Date in MM/DD/YYYY format of sample collection.
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 08/10/2023
Range_Domain_Maximum: 08/13/2024
Attribute_Units_of_Measure: Date in month/day/year format
Attribute:
Attribute_Label: Time_UTC
Attribute_Definition:
Time of sample collection, in hh:mm:ss format, Coordinated Universal Time (UTC)
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 15:06:00
Range_Domain_Maximum: 21:20:00
Attribute_Units_of_Measure: hours:minutes:seconds format, Coordinated Universal Time (UTC)
Attribute:
Attribute_Label: Latitude
Attribute_Definition: Latitude of sample location in decimal degrees, north.
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 37.57592
Range_Domain_Maximum: 37.61126
Attribute_Units_of_Measure: Decimal degrees
Attribute:
Attribute_Label: Longitude
Attribute_Definition: Longitude of sample location in decimal degrees, east.
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -122.18533
Range_Domain_Maximum: -122.14645
Attribute_Units_of_Measure: Decimal degrees
Attribute:
Attribute_Label: Sample_Height_MAB
Attribute_Definition:
The height in meters above the seabed where sample collection occurred. MAB stands for Meters Above Bed.
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.15
Range_Domain_Maximum: 2.65
Attribute_Units_of_Measure: meters
Attribute:
Attribute_Label: Method
Attribute_Definition: Method of sample collection.
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: pump
Enumerated_Domain_Value_Definition: Samples were collected using a peristaltic pump
Enumerated_Domain_Value_Definition_Source: Producer defined
Attribute:
Attribute_Label: Total_Depth_m
Attribute_Definition:
Water depth in meters at time of sampling, determined from the ships echosounder.
Attribute_Definition_Source: Producer defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.8
Range_Domain_Maximum: 3.4
Attribute_Units_of_Measure: meters
Attribute:
Attribute_Label: Aliquot_Volume_ml
Attribute_Definition: The volume of sample in milliliters used for the analysis.
Attribute_Definition_Source: producer defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 80.0
Range_Domain_Maximum: 250.0
Attribute_Units_of_Measure: milliliters
Attribute:
Attribute_Label: Sediment_Weight_mg
Attribute_Definition: The weight of the dried sediment captured by the filter.
Attribute_Definition_Source: producer defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.82
Range_Domain_Maximum: 16.37
Attribute_Units_of_Measure: milligrams
Attribute:
Attribute_Label: Suspended_Sediment_Concentration_mg/l
Attribute_Definition:
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.
Attribute_Definition_Source: producer defined
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 3.56
Range_Domain_Maximum: 118.38
Attribute_Units_of_Measure: milligram per liter
Overview_Description:
Entity_and_Attribute_Overview: The first line of the csv file is a header line.
Entity_and_Attribute_Detail_Citation: U.S. Geological Survey
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey - CMGDS
Contact_Address:
Address_Type: mailing and physical
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060
Contact_Voice_Telephone: 831-427-4747
Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov
Resource_Description:
These data are available in csv format (DMP23_SSC.csv) accompanied by CSDGM FGDC-compliant metadata.
Distribution_Liability:
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.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: comma-delimited text
Format_Version_Number: Microsoft Excel 2002 (12527.20988) 64-bit
Format_Information_Content: file contains the csv table
File_Decompression_Technique: No compression applied
Transfer_Size: 0.0155
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: https://doi.org/10.5066/P14D723N
Access_Instructions:
Data can be downloaded using the Network_Resource_Name link and scrolling down to the Turbidity Data section.
Fees: None.
Technical_Prerequisites:
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.
Metadata_Reference_Information:
Metadata_Date: 20250820
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: PCMSC Science Data Coordinator
Contact_Organization:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Contact_Address:
Address_Type: mailing and physical
Address: 2885 Mission Street
City: Santa Cruz
State_or_Province: CA
Postal_Code: 95060
Country: United States
Contact_Voice_Telephone: 831-427-4747
Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov
Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/DataReleases/CMGDS_DR_tool/DR_P14D723N/DMP23_SSC_metadata.html>
Generated by mp version 2.9.51 on Tue Sep 2 13:32:13 2025