Metadata: Identification_Information: Citation: Citation_Information: Originator: Thomas D. Lorenson Originator: Amy E. East Publication_Date: 20240103 Title: Lead, Radium, Cesium, and Thorium isotope activity in sediment samples from Los Padres reservoir, Carmel River watershed, California Geospatial_Data_Presentation_Form: comma-delimited text Series_Information: Series_Name: data release Issue_Identification: DOI:10.5066/P99M6Y8O Publication_Information: Publication_Place: Pacific Coastal and Marine Science Center, Santa Cruz, California Publisher: U.S. Geological Survey Other_Citation_Details: Suggested Citation: Lorenson, T.D. and East, A.E., 2024, Lead, Radium, Cesium, and Thorium isotope activity in sediment samples from Los Padres reservoir, Carmel River watershed, California, U.S. Geological Survey data release, https://doi.org/10.5066/P99M6Y8O. Online_Linkage: https://doi.org/10.5066/P99M6Y8O Description: Abstract: Sediment samples were collected from Los Padres reservoir in the Carmel River watershed, central California coast, between July 11 and 17, 2017, using a CME-45 barge-mounted drill rig, to characterize sedimentary properties in the reservoir deposits following the Soberanes Fire of 2016 and high river flows in winter 2017. Borehole samples were recovered using direct push coring with an Osterberg piston sampler operated by Taber Drilling Company of Sacramento, California, and overseen by AECOM, Inc. Sediment was recovered using a split-barrel sampler and a rotary drill bit was added to the sampler where needed to penetrate coarse sediment. Samples from three boreholes are described in this data release: two sampled at multiple sediment depths (B2 and B7) and a third (B4) from which only the topmost sample is included. Each borehole was drilled to the depth of apparent pre-dam alluvium or bedrock. Alternate sections were described and sampled; every second section was discarded without examination. Geochemical data are reported for sediment cores. Data include short-lived cosmogenic and natural radionuclide activities for Lead-210; Radium-226, Cesium-137, Thorium-234, and excess Lead-210. The USGS gratefully acknowledges collaboration with B. Kozlowicz of AECOM, Inc., in the collection of these data. Purpose: Laboratory measurements of natural lead, radium, cesium, and thorium isotope concentrations in Los Padres reservoir, Carmel River watershed, California, to characterize post-fire sedimentation history. Purpose: Laboratory measurements of isotopic activity in borehole sediment from Los Padres reservoir, Carmel River watershed, California, to characterize post-fire sedimentation history. Supplemental_Information: This data release is associated with the following data release including grain size and charcoal abundance in Los Padres reservoir sediment samples: https://doi.org/10.5066/P9C7NKM4. Additional information about the field activities from which these data were derived is available online at: https://cmgds.marine.usgs.gov/fan_info.php?fan=2017-635-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: Multiple_Dates/Times: Single_Date/Time: Calendar_Date: 20170713 Single_Date/Time: Calendar_Date: 20170714 Single_Date/Time: Calendar_Date: 20170716 Currentness_Reference: ground condition at time data were collected Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -121.666476 East_Bounding_Coordinate: -121.664314 North_Bounding_Coordinate: 36.383113 South_Bounding_Coordinate: 36.380511 Keywords: Theme: Theme_Keyword_Thesaurus: ISO 19115 Topic Category Theme_Keyword: geoscientificInformation Theme_Keyword: environment Theme_Keyword: inlandWaters Theme: Theme_Keyword_Thesaurus: Data Categories for Marine Planning Theme_Keyword: Data Content Subjects Theme_Keyword: Nonliving Resources Theme: Theme_Keyword_Thesaurus: USGS Thesaurus Theme_Keyword: Sciences Theme: Theme_Keyword_Thesaurus: Marine Realms Information Bank (MRIB) keywords Theme_Keyword: coastal change hazards topics Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: U.S. Geological Survey Theme_Keyword: USGS Theme_Keyword: Coastal and Marine Hazards and Resources Program Theme_Keyword: CMHRP Theme_Keyword: Pacific Coastal and Marine Science Center Theme_Keyword: PCMSC Theme: Theme_Keyword_Thesaurus: USGS Metadata Identifier Theme_Keyword: USGS:650b3ce4d34e823a02735e31 Place: Place_Keyword_Thesaurus: Geographic Names Information System (GNIS) Place_Keyword: Carmel River Access_Constraints: None 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 as the originator(s) 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: 831-427-4747 Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov Native_Data_Set_Environment: Geochemical data are tabulated in comma separated variable (CSV) format. With Microsoft Excel for Mac V 16.78.3 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: For radionuclides, sample activities were calculated by comparison to reference standards with the same geometry and counting time; reported uncertainties include 1 standard deviation counting errors, detector efficiency, and background corrections. Counting efficiency for Cesium-137 was determined by comparison to the International Atomic Energy Agency (IAEA) Standard Reference Material 300. Counting efficiency for Lead-210, Thorium-234, Radium-228, and Radium-226 was determined using IAEA standards RGU-1 and RGTh-1. Logical_Consistency_Report: No formal logical consistency tests were conducted. 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. Positional_Accuracy: Horizontal_Positional_Accuracy: Horizontal_Positional_Accuracy_Report: A Garmin handheld GPS reported a horizontal accuracy of plus or minus 3 meters. Lineage: Process_Step: Process_Description: SEDIMENT COLLECTION. Surface sediment was collected using a benthic grab sampler deployed from a boat. Long cores were collected using a vibracore device deployed from the A-frame of the boat. Process_Date: 20171025 Process_Step: Process_Description: 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. For surface sediment and Cores 3, 5, 6, and 9, 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), Lead-210 at 46.5 keV, and Radium-226 as the average of indirect peaks at 351.87 keV (Lead-214) and 609.31 keV (Bismuth-214). Unsupported, or excess, Lead-210 was calculated by subtracting supported Lead-210 (assumed to equal average Radium-226 activity) from total Lead-210. Process_Date: 20200212 Spatial_Data_Organization_Information: 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: 20 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: 0.00001 Longitude_Resolution: 0.00001 Geographic_Coordinate_Units: Decimal degrees Geodetic_Model: Horizontal_Datum_Name: North American Datum 1983 Ellipsoid_Name: GRS 1980 Semi-major_Axis: 6378137.0000 Denominator_of_Flattening_Ratio: 298.2572 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: Attribute table Entity_Type_Definition: Table of data Entity_Type_Definition_Source: producer defined Attribute: Attribute_Label: Sample_ID Attribute_Definition: Sample ID refers to borehole number and depth in borehole Attribute_Definition_Source: producer defined Attribute_Domain_Values: Unrepresentable_Domain: unique identifier for each sample Attribute: Attribute_Label: Date_Collected Attribute_Definition: Date of sample collection Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 07/13/2017 Range_Domain_Maximum: 07/16/2017 Attribute_Units_of_Measure: mm/dd/yyyy Attribute: Attribute_Label: Longitude_NAD83 Attribute_Definition: Longitude of collection Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -121.66648 Range_Domain_Maximum: -121.66431 Attribute_Units_of_Measure: meters Attribute: Attribute_Label: Latitude_NAD83 Attribute_Definition: latitude of sample Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 36.38051 Range_Domain_Maximum: 36.38311 Attribute_Units_of_Measure: meters Attribute: Attribute_Label: Midpoint_depth_cm Attribute_Definition: midpoint depth of sample cm Attribute_Definition_Source: producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 3 Range_Domain_Maximum: 1654 Attribute_Units_of_Measure: centimeters Attribute: Attribute_Label: 210Pb_total_activity_dpm/g Attribute_Definition: Activity of supported, or excess, Lead-210; -9999=not determined Attribute_Definition_Source: Producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1.51 Range_Domain_Maximum: 9.61 Attribute_Units_of_Measure: disintegrations per minute per gram (dpm per g) Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: 210Pb_total_uncertainty_dpm/g Attribute_Definition: Measurement uncertainty of excess Lead-210 activity estimated from: detector efficiency, background correction, and one standard deviation of the counting error; -9999=not determined Attribute_Definition_Source: Producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.33 Range_Domain_Maximum: 1.83 Attribute_Units_of_Measure: disintegrations per minute per gram (dpm per g) Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: 226Ra_activity_dpm/g Attribute_Definition: Activity of supported, or excess, Radium-226; -9999=not determined Attribute_Definition_Source: Producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1.64 Range_Domain_Maximum: 3.88 Attribute_Units_of_Measure: disintegrations per minute per gram (dpm per g) Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: 226Ra_uncertainty_dpm/g Attribute_Definition: Measurement uncertainty of excess Radium-226 activity estimated from: detector efficiency, background correction, and one standard deviation of the counting error; -9999=not determined Attribute_Definition_Source: Producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.08 Range_Domain_Maximum: 0.31 Attribute_Units_of_Measure: disintegrations per minute per gram (dpm per g) Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: 210Pb_excess_activity_dpm/g Attribute_Definition: Activity of supported, or excess, Lead-210; -9999=not determined Attribute_Definition_Source: Producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: -0.21 Range_Domain_Maximum: 6.14 Attribute_Units_of_Measure: disintegrations per minute per gram (dpm per g) Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: 210Pb_excess_uncertainty_dpm/g Attribute_Definition: Measurement uncertainty of excess Lead-210 activity estimated from: detector efficiency, background correction, and one standard deviation of the counting error; -9999=not determined Attribute_Definition_Source: Producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.34 Range_Domain_Maximum: 1.86 Attribute_Units_of_Measure: disintegrations per minute per gram (dpm per g) Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: 137Cs_activity_dpm/g Attribute_Definition: Activity of Cesium-137; -9999=not determined Attribute_Definition_Source: Producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 2.51 Attribute_Units_of_Measure: disintegrations per minute per gram (dpm per g) Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: 137Cs_uncertainty_dpm/g Attribute_Definition: Measurement uncertainty of Cesium-137 activity estimated from: detector efficiency, background correction, and one standard deviation of the counting error; -9999=not determined Attribute_Definition_Source: Producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00 Range_Domain_Maximum: 1.68 Attribute_Units_of_Measure: disintegrations per minute per gram (dpm per g) Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: Th234_activity_dpm/g Attribute_Definition: Activity of Thorium-234; -9999=not determined Attribute_Definition_Source: Producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 1.31 Range_Domain_Maximum: 5.71 Attribute_Units_of_Measure: disintegrations per minute per gram (dpm per g) Attribute_Measurement_Resolution: 0.01 Attribute: Attribute_Label: 234Th_uncertainty_dpm/g Attribute_Definition: Measurement uncertainty of Thorium-234 activity estimated from: detector efficiency, background correction, and one standard deviation of the counting error; -9999 =not determined Attribute_Definition_Source: Producer defined Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.27 Range_Domain_Maximum: 1.33 Attribute_Units_of_Measure: disintegrations per minute per gram (dpm per g) Attribute_Measurement_Resolution: 0.01 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 - ScienceBase Contact_Address: Address_Type: mailing and physical Address: Denver Federal Center, Building 810, Mail Stop 302 City: Denver State_or_Province: CO Postal_Code: 80225 Contact_Voice_Telephone: 1-888-275-8747 Contact_Electronic_Mail_Address: sciencebase@usgs.gov Resource_Description: These data are available in csv format (Los_Padres_Reservior_Gamma.csv) and includes 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: Microsfot Excel for Mac V. 16.78.3 Format_Information_Content: File contains table in .csv format File_Decompression_Technique: No compression applied Transfer_Size: 0.003 Digital_Transfer_Option: Online_Option: Computer_Contact_Information: Network_Address: Network_Resource_Name: https://www.sciencebase.gov/catalog/file/get/650b3ce4d34e823a02735e31 Network_Resource_Name: https://www.sciencebase.gov/catalog/item/650b3ce4d34e823a02735e31 Network_Resource_Name: https://doi.org/10.5066/P99M6Y8O Access_Instructions: Data can be downloaded using the Network_Resource_Name links. The first link is a direct link to download a zipped file of data and metadata. The second and thrid links point to a landing page with metadata and data. Fees: None. Technical_Prerequisites: These data can be viewed with any text reader. Metadata_Reference_Information: Metadata_Date: 20240103 Metadata_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: 831-427-4747 Contact_Electronic_Mail_Address: pcmsc_data@usgs.gov Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998