Parent and alkylated polycyclic aromatic hydrocarbons (PAHs) in watershed soil and reef sediment at Olowalu, Maui, 2022

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Frequently anticipated questions:

What does this data set describe?

Title:
Parent and alkylated polycyclic aromatic hydrocarbons (PAHs) in watershed soil and reef sediment at Olowalu, Maui, 2022
Abstract:
Seventy six parent and alkylated polycyclic aromatic compounds, including polycyclic aromatic hydrocarbons (PAHs), were quantified in watershed and reef sediment from Olowalu, Maui, in February 2022 to explore urban and wildfire effects. Sample locations and total organic carbon contents (OC) are available in the accompanying file OlowaluWatershedReef2022_compositions.csv.
Supplemental_Information:
Additional information about the field activity or activities from which these data were derived is available online at:
https://cmgds.marine.usgs.gov/fan_info.php?fan=2022-606-FA
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
  1. How might this data set be cited?
    Takesue, Renee K., Falinski, Kim, Hodges, Amy, Deakos, Mark, and Storlazzi, Curt D., 20240307, Parent and alkylated polycyclic aromatic hydrocarbons (PAHs) in watershed soil and reef sediment at Olowalu, Maui, 2022: data release DOI:10.5066/P92N5DT3, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

    This is part of the following larger work.

    Takesue, Renee K., Falinski, Kim, Hodges, Amy, Deakos, Mark, and Storlazzi, Curt D., 2024, Metals and PAHs in watershed soil and reef sediment at Olowalu and leeward Maui, February 2022: data release DOI:10.5066/P92N5DT3, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

    Online Links:

    Other_Citation_Details:
    Suggested Citation: Takesue, R.K., Falinski, K., Hodges, A., Deakos, M., and Storlazzi, C.D., 2024,Metals and PAHs in watershed soil and reef sediment at Olowalu and leeward Maui, February 2022: U.S. Geological Survey, https://doi.org/10.5066/P92N5DT3.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -156.63914
    East_Bounding_Coordinate: -156.45059
    North_Bounding_Coordinate: 20.84197
    South_Bounding_Coordinate: 20.76454
  3. What does it look like?
    https://www.sciencebase.gov/catalog/file/get/64b8078ad34e70357a2b49c9?name=pic_charred_trees_OLO.jpeg&allowOpen=true (PNG)
    Picture of charred and regrowing vegetation above Olowalu Reef
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 12-Feb-2022
    Ending_Date: 17-Feb-2022
    Currentness_Reference:
    Watershed and reef sediment samples were collected approximately two months after winter flooding in December 2021 and one month after tsunamigenic waves impinged on the leeward Maui shore from the January 15, 2022 eruption of Hunga-Tonga volcano in the South Pacific.
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: comma-delimited text
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Point data set. It contains the following vector data types (SDTS terminology):
      • Point (23)
    2. What coordinate system is used to represent geographic features?
      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.00001. Longitudes are given to the nearest 0.00001. Latitude and longitude values are specified in Decimal degrees. The horizontal datum used is D_WGS_1984.
      The ellipsoid used is WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.0000.
      The flattening of the ellipsoid used is 1/298.2572.
  7. How does the data set describe geographic features?
    Attribute table
    Table of data. Abbreviations: OK, value meets all quality control criteria; J, concentration less than lowest calibration equivalent; K, peak detected but did not meet quantification criteria and the reported value is the maximum possible concentration; U, not detected at reporting limit. Flag codes separated by an underscore (_) indicate both conditions apply. -9999, not detected at reporting limit. (Source: Producer defined)
    Compound_ID
    Unique names of polycyclic aromatic compounds. (Source: Producer defined) Unique alphanumeric compound names.
    FIRE22_20_flag
    Analytical quality control (QC) codes. Flag codes separated by an underscore (_) indicate both conditions apply. (Source: Producer defined)
    ValueDefinition
    OKAll QC criteria were satisfied.
    JConcentration was less than the lowest calibration standard.
    KCompound peak was detected but did not meet quantification criteria; the reported value is the maximum possible concentration.
    UCompound was not detected at the reporting limit.
    FIRE22_20_concentration
    Concentrations of polycyclic aromatic compounds. -9999, not detected at the reporting limit. (Source: Producer defined)
    Range of values
    Minimum:0.093
    Maximum:13.7
    Units:nanograms per gram (ng/g) dry weight
    FIRE22_20_reporting_limit
    Analytical reporting limits for polycyclic aromatic compounds in sediment. (Source: Producer defined)
    Range of values
    Minimum:0.0367
    Maximum:0.352
    Units:nanograms per gram (ng/g) dry weight
    KEA22_01_flag
    Analytical quality control (QC) codes. Flag codes separated by an underscore (_) indicate both conditions apply. (Source: Producer defined)
    ValueDefinition
    OKAll QC criteria were satisfied.
    JConcentration was less than the lowest calibration standard.
    KCompound peak was detected but did not meet quantification criteria; the reported value is the maximum possible concentration.
    UCompound was not detected at the reporting limit.
    KEA22_01_concentration
    Concentrations of polycyclic aromatic compounds. -9999, not detected at the reporting limit. (Source: Producer defined)
    Range of values
    Minimum:0.059
    Maximum:3.72
    Units:nanograms per gram (ng/g) dry weight
    KEA22_01_reporting_limit
    Analytical reporting limits for polycyclic aromatic compounds in sediment. (Source: Producer defined)
    Range of values
    Minimum:0.0323
    Maximum:0.329
    Units:nanograms per gram (ng/g) dry weight
    KEA22_03_flag
    Analytical quality control (QC) codes. Flag codes separated by an underscore (_) indicate both conditions apply. (Source: Producer defined)
    ValueDefinition
    OKAll QC criteria were satisfied.
    JConcentration was less than the lowest calibration standard.
    KCompound peak was detected but did not meet quantification criteria; the reported value is the maximum possible concentration.
    UCompound was not detected at the reporting limit.
    KEA22_03_concentration
    Concentrations of polycyclic aromatic compounds. -9999, not detected at the reporting limit. (Source: Producer defined)
    Range of values
    Minimum:0.112
    Maximum:0.455
    Units:nanograms per gram (ng/g) dry weight
    KEA22_03_reporting_limit
    Analytical reporting limits for polycyclic aromatic compounds in sediment. (Source: Producer defined)
    Range of values
    Minimum:0.0347
    Maximum:0.418
    Units:nanograms per gram (ng/g) dry weight
    KEA22_06_flag
    Analytical quality control (QC) codes. Flag codes separated by an underscore (_) indicate both conditions apply. (Source: Producer defined)
    ValueDefinition
    OKAll QC criteria were satisfied.
    JConcentration was less than the lowest calibration standard.
    KCompound peak was detected but did not meet quantification criteria; the reported value is the maximum possible concentration.
    UCompound was not detected at the reporting limit.
    KEA22_06_concentration
    Concentrations of polycyclic aromatic compounds. -9999, not detected at the reporting limit. (Source: Producer defined)
    Range of values
    Minimum:0.155
    Maximum:44.1
    Units:nanograms per gram (ng/g) dry weight
    KEA22_06_reporting_limit
    Analytical reporting limits for polycyclic aromatic compounds in sediment. (Source: Producer defined)
    Range of values
    Minimum:0.0324
    Maximum:0.385
    Units:nanograms per gram (ng/g) dry weight
    UKU22_08_flag
    Analytical quality control (QC) codes. Flag codes separated by an underscore (_) indicate both conditions apply. (Source: Producer defined)
    ValueDefinition
    OKAll QC criteria were satisfied.
    JConcentration was less than the lowest calibration standard.
    KCompound peak was detected but did not meet quantification criteria; the reported value is the maximum possible concentration.
    UCompound was not detected at the reporting limit.
    UKU22_08_concentration
    Concentrations of polycyclic aromatic compounds. -9999, not detected at the reporting limit. (Source: Producer defined)
    Range of values
    Minimum:0.196
    Maximum:95.5
    Units:nanograms per gram (ng/g) dry weight
    UKU22_08_reporting_limit
    Analytical reporting limits for polycyclic aromatic compounds in sediment. (Source: Producer defined)
    Range of values
    Minimum:0.0186
    Maximum:0.306
    Units:nanograms per gram (ng/g) dry weight
    UKU22_09A_flag
    Analytical quality control (QC) codes. Flag codes separated by an underscore (_) indicate both conditions apply. (Source: Producer defined)
    ValueDefinition
    OKAll QC criteria were satisfied.
    JConcentration was less than the lowest calibration standard.
    KCompound peak was detected but did not meet quantification criteria; the reported value is the maximum possible concentration.
    UCompound was not detected at the reporting limit.
    UKU22_09A_concentration
    Concentrations of polycyclic aromatic compounds. -9999, not detected at the reporting limit. (Source: Producer defined)
    Range of values
    Minimum:0.0900
    Maximum:43.5
    Units:nanograms per gram (ng/g) dry weight
    UKU22_09A_reporting_limit
    Analytical reporting limits for polycyclic aromatic compounds in sediment. (Source: Producer defined)
    Range of values
    Minimum:0.0395
    Maximum:0.339
    Units:nanograms per gram (ng/g) dry weight
    REEF22_08_flag
    Analytical quality control (QC) codes. Flag codes separated by an underscore (_) indicate both conditions apply. (Source: Producer defined)
    ValueDefinition
    OKAll QC criteria were satisfied.
    JConcentration was less than the lowest calibration standard.
    KCompound peak was detected but did not meet quantification criteria; the reported value is the maximum possible concentration.
    UCompound was not detected at the reporting limit.
    REEF22_08_concentration
    Concentrations of polycyclic aromatic compounds. -9999, not detected at the reporting limit. (Source: Producer defined)
    Range of values
    Minimum:0.0420
    Maximum:1.75
    Units:nanograms per gram (ng/g) dry weight
    REEF22_08_reporting_limit
    Analytical reporting limits for polycyclic aromatic compounds in sediment. (Source: Producer defined)
    Range of values
    Minimum:0.0398
    Maximum:0.399
    Units:nanograms per gram (ng/g) dry weight
    REEF22_13_flag
    Analytical quality control (QC) codes. Flag codes separated by an underscore (_) indicate both conditions apply. (Source: Producer defined)
    ValueDefinition
    OKAll QC criteria were satisfied.
    JConcentration was less than the lowest calibration standard.
    KCompound peak was detected but did not meet quantification criteria; the reported value is the maximum possible concentration.
    UCompound was not detected at the reporting limit.
    REEF22_13_concentration
    Concentrations of polycyclic aromatic compounds. -9999, not detected at the reporting limit. (Source: Producer defined)
    Range of values
    Minimum:0.149
    Maximum:1.71
    Units:nanograms per gram (ng/g) dry weight
    REEF22_13_reporting_limit
    Analytical reporting limits for polycyclic aromatic compounds in sediment. (Source: Producer defined)
    Range of values
    Minimum:0.0641
    Maximum:0.457
    Units:nanograms per gram (ng/g) dry weight
    REEF22_16_flag
    Analytical quality control (QC) codes. Flag codes separated by an underscore (_) indicate both conditions apply. (Source: Producer defined)
    ValueDefinition
    OKAll QC criteria were satisfied.
    JConcentration was less than the lowest calibration standard.
    KCompound peak was detected but did not meet quantification criteria; the reported value is the maximum possible concentration.
    UCompound was not detected at the reporting limit.
    REEF22_16_concentration
    Concentrations of polycyclic aromatic compounds. -9999, not detected at the reporting limit. (Source: Producer defined)
    Range of values
    Minimum:0.158
    Maximum:1.47
    Units:nanograms per gram (ng/g) dry weight
    REEF22_16_reporting_limit
    Analytical reporting limits for polycyclic aromatic compounds in sediment. (Source: Producer defined)
    Range of values
    Minimum:0.0713
    Maximum:0.410
    Units:nanograms per gram (ng/g) dry weight
    HARB22_10_flag
    Analytical quality control (QC) codes. Flag codes separated by an underscore (_) indicate both conditions apply. (Source: Producer defined)
    ValueDefinition
    OKAll QC criteria were satisfied.
    JConcentration was less than the lowest calibration standard.
    KCompound peak was detected but did not meet quantification criteria; the reported value is the maximum possible concentration.
    UCompound was not detected at the reporting limit.
    HARB22_10_concentration
    Concentrations of polycyclic aromatic compounds. -9999, not detected at the reporting limit. (Source: Producer defined)
    Range of values
    Minimum:0.194
    Maximum:19.9
    Units:nanograms per gram (ng/g) dry weight
    HARB22_10_reporting_limit
    Analytical reporting limits for polycyclic aromatic compounds in sediment. (Source: Producer defined)
    Range of values
    Minimum:0.0247
    Maximum:3.31
    Units:nanograms per gram (ng/g) dry weight
    KEA22_02_flag
    Analytical quality control (QC) codes. Flag codes separated by an underscore (_) indicate both conditions apply. (Source: Producer defined)
    ValueDefinition
    OKAll QC criteria were satisfied.
    JConcentration was less than the lowest calibration standard.
    KCompound peak was detected but did not meet quantification criteria; the reported value is the maximum possible concentration.
    UCompound was not detected at the reporting limit.
    KEA22_02_concentration
    Concentrations of polycyclic aromatic compounds. -9999, not detected at the reporting limit. (Source: Producer defined)
    Range of values
    Minimum:0.0600
    Maximum:4.14
    Units:nanograms per gram (ng/g) dry weight
    KEA22_02_reporting_limit
    Analytical reporting limits for polycyclic aromatic compounds in sediment. (Source: Producer defined)
    Range of values
    Minimum:0.0256
    Maximum:0.320
    Units:nanograms per gram (ng/g) dry weight
    UKU22_09C_flag
    Analytical quality control (QC) codes. Flag codes separated by an underscore (_) indicate both conditions apply. (Source: Producer defined)
    ValueDefinition
    OKAll QC criteria were satisfied.
    JConcentration was less than the lowest calibration standard.
    KCompound peak was detected but did not meet quantification criteria; the reported value is the maximum possible concentration.
    UCompound was not detected at the reporting limit.
    UKU22_09C_concentration
    Concentrations of polycyclic aromatic compounds. -9999, not detected at the reporting limit. (Source: Producer defined)
    Range of values
    Minimum:0.0740
    Maximum:4.28
    Units:nanograms per gram (ng/g) dry weight
    UKU22_09C_reporting_limit
    Analytical reporting limits for polycyclic aromatic compounds in sediment. (Source: Producer defined)
    Range of values
    Minimum:0.0321
    Maximum:0.352
    Units:nanograms per gram (ng/g) dry weight
    UKU22_14_flag
    Analytical quality control (QC) codes. Flag codes separated by an underscore (_) indicate both conditions apply. (Source: Producer defined)
    ValueDefinition
    OKAll QC criteria were satisfied.
    JConcentration was less than the lowest calibration standard.
    KCompound peak was detected but did not meet quantification criteria; the reported value is the maximum possible concentration.
    UCompound was not detected at the reporting limit.
    UKU22_14_concentration
    Concentrations of polycyclic aromatic compounds. -9999, not detected at the reporting limit. (Source: Producer defined)
    Range of values
    Minimum:0.134
    Maximum:17.2
    Units:nanograms per gram (ng/g) dry weight
    UKU22_14_reporting_limit
    Analytical reporting limits for polycyclic aromatic compounds in sediment. (Source: Producer defined)
    Range of values
    Minimum:0.0137
    Maximum:0.309
    Units:nanograms per gram (ng/g) dry weight
    REEF22_02B_flag
    Analytical quality control (QC) codes. Flag codes separated by an underscore (_) indicate both conditions apply. (Source: Producer defined)
    ValueDefinition
    OKAll QC criteria were satisfied.
    JConcentration was less than the lowest calibration standard.
    KCompound peak was detected but did not meet quantification criteria; the reported value is the maximum possible concentration.
    UCompound was not detected at the reporting limit.
    REEF22_02B_concentration
    Concentrations of polycyclic aromatic compounds. -9999, not detected at the reporting limit. (Source: Producer defined)
    Range of values
    Minimum:0.122
    Maximum:0.888
    Units:nanograms per gram (ng/g) dry weight
    REEF22_02B_reporting_limit
    Analytical reporting limits for polycyclic aromatic compounds in sediment. (Source: Producer defined)
    Range of values
    Minimum:0.0689
    Maximum:0.455
    Units:nanograms per gram (ng/g) dry weight
    REEF22_05B_flag
    Analytical quality control (QC) codes. Flag codes separated by an underscore (_) indicate both conditions apply. (Source: Producer defined)
    ValueDefinition
    OKAll QC criteria were satisfied.
    JConcentration was less than the lowest calibration standard.
    KCompound peak was detected but did not meet quantification criteria; the reported value is the maximum possible concentration.
    UCompound was not detected at the reporting limit.
    REEF22_05B_concentration
    Concentrations of polycyclic aromatic compounds. -9999, not detected at the reporting limit. (Source: Producer defined)
    Range of values
    Minimum:1.79
    Maximum:25.4
    Units:nanograms per gram (ng/g) dry weight
    REEF22_05B_reporting_limit
    Analytical reporting limits for polycyclic aromatic compounds in sediment. (Source: Producer defined)
    Range of values
    Minimum:1.23
    Maximum:7.370
    Units:nanograms per gram (ng/g) dry weight
    REEF22_15_flag
    Analytical quality control (QC) codes. Flag codes separated by an underscore (_) indicate both conditions apply. (Source: Producer defined)
    ValueDefinition
    OKAll QC criteria were satisfied.
    JConcentration was less than the lowest calibration standard.
    KCompound peak was detected but did not meet quantification criteria; the reported value is the maximum possible concentration.
    UCompound was not detected at the reporting limit.
    REEF22_15_concentration
    Concentrations of polycyclic aromatic compounds. -9999, not detected at the reporting limit. (Source: Producer defined)
    Range of values
    Minimum:0.0660
    Maximum:0.916
    Units:nanograms per gram (ng/g) dry weight
    REEF22_15_reporting_limit
    Analytical reporting limits for polycyclic aromatic compounds in sediment. (Source: Producer defined)
    Range of values
    Minimum:0.0291
    Maximum:0.442
    Units:nanograms per gram (ng/g) dry weight
    REEF22_17_flag
    Analytical quality control (QC) codes. Flag codes separated by an underscore (_) indicate both conditions apply. (Source: Producer defined)
    ValueDefinition
    OKAll QC criteria were satisfied.
    JConcentration was less than the lowest calibration standard.
    KCompound peak was detected but did not meet quantification criteria; the reported value is the maximum possible concentration.
    UCompound was not detected at the reporting limit.
    REEF22_17_concentration
    Concentrations of polycyclic aromatic compounds. -9999, not detected at the reporting limit. (Source: Producer defined)
    Range of values
    Minimum:0.0890
    Maximum:0.598
    Units:nanograms per gram (ng/g) dry weight
    REEF22_17_reporting_limit
    Analytical reporting limits for polycyclic aromatic compounds in sediment. (Source: Producer defined)
    Range of values
    Minimum:0.0326
    Maximum:0.368
    Units:nanograms per gram (ng/g) dry weight
    REEF22_19_flag
    Analytical quality control (QC) codes. Flag codes separated by an underscore (_) indicate both conditions apply. (Source: Producer defined)
    ValueDefinition
    OKAll QC criteria were satisfied.
    JConcentration was less than the lowest calibration standard.
    KCompound peak was detected but did not meet quantification criteria; the reported value is the maximum possible concentration.
    UCompound was not detected at the reporting limit.
    REEF22_19_concentration
    Concentrations of polycyclic aromatic compounds. -9999, not detected at the reporting limit. (Source: Producer defined)
    Range of values
    Minimum:0.0990
    Maximum:0.838
    Units:nanograms per gram (ng/g) dry weight
    REEF22_19_reporting_limit
    Analytical reporting limits for polycyclic aromatic compounds in sediment. (Source: Producer defined)
    Range of values
    Minimum:0.0437
    Maximum:0.490
    Units:nanograms per gram (ng/g) dry weight
    LabBlank_01_flag
    Analytical quality control (QC) codes. (Source: Producer defined)
    ValueDefinition
    UCompound was not detected at the reporting limit.
    LabBlank_01_concentration
    Concentrations of polycyclic aromatic compounds. -9999, not detected at the reporting limit. (Source: Producer defined)
    Range of values
    Minimum:-9999
    Maximum:-9999
    Units:nanograms per gram (ng/g) dry weight
    LabBlank_01_reporting_limit
    Analytical reporting limits for polycyclic aromatic compounds in sediment. (Source: Producer defined)
    Range of values
    Minimum:0.0396
    Maximum:0.425
    Units:nanograms per gram (ng/g) dry weight
    SpikedMatrix_01_recovery
    Recovery of internal standards in a matrix-matched sample. (Source: Producer defined)
    Range of values
    Minimum:72.2
    Maximum:148
    Units:percent
    KEA22_04_flag
    Analytical quality control (QC) codes. Flag codes separated by an underscore (_) indicate both conditions apply. (Source: Producer defined)
    ValueDefinition
    OKAll QC criteria were satisfied.
    JConcentration was less than the lowest calibration standard.
    KCompound peak was detected but did not meet quantification criteria; the reported value is the maximum possible concentration.
    UCompound was not detected at the reporting limit.
    KEA22_04_concentration
    Concentrations of polycyclic aromatic compounds. -9999, not detected at the reporting limit. (Source: Producer defined)
    Range of values
    Minimum:0.0610
    Maximum:46.4
    Units:nanograms per gram (ng/g) dry weight
    KEA22_04_reporting_limit
    Analytical reporting limits for polycyclic aromatic compounds in sediment. (Source: Producer defined)
    Range of values
    Minimum:0.0193
    Maximum:0.233
    Units:nanograms per gram (ng/g) dry weight
    UKU22_11_flag
    Analytical quality control (QC) codes. Flag codes separated by an underscore (_) indicate both conditions apply. (Source: Producer defined)
    ValueDefinition
    OKAll QC criteria were satisfied.
    JConcentration was less than the lowest calibration standard.
    KCompound peak was detected but did not meet quantification criteria; the reported value is the maximum possible concentration.
    UCompound was not detected at the reporting limit.
    UKU22_11_concentration
    Concentrations of polycyclic aromatic compounds. -9999, not detected at the reporting limit. (Source: Producer defined)
    Range of values
    Minimum:0.0340
    Maximum:0.685
    Units:nanograms per gram (ng/g) dry weight
    UKU22_11_reporting_limit
    Analytical reporting limits for polycyclic aromatic compounds in sediment. (Source: Producer defined)
    Range of values
    Minimum:0.0139
    Maximum:0.0972
    Units:nanograms per gram (ng/g) dry weight
    REEF22_05_flag
    Analytical quality control (QC) codes. Flag codes separated by an underscore (_) indicate both conditions apply. (Source: Producer defined)
    ValueDefinition
    OKAll QC criteria were satisfied.
    JConcentration was less than the lowest calibration standard.
    KCompound peak was detected but did not meet quantification criteria; the reported value is the maximum possible concentration.
    UCompound was not detected at the reporting limit.
    REEF22_05_concentration
    Concentrations of polycyclic aromatic compounds. -9999, not detected at the reporting limit. (Source: Producer defined)
    Range of values
    Minimum:0.0170
    Maximum:3.73
    Units:nanograms per gram (ng/g) dry weight
    REEF22_05_reporting_limit
    Analytical reporting limits for polycyclic aromatic compounds in sediment. (Source: Producer defined)
    Range of values
    Minimum:0.0161
    Maximum:0.162
    Units:nanograms per gram (ng/g) dry weight
    MAA22_04_flag
    Analytical quality control (QC) codes. Flag codes separated by an underscore (_) indicate both conditions apply. (Source: Producer defined)
    ValueDefinition
    OKAll QC criteria were satisfied.
    JConcentration was less than the lowest calibration standard.
    KCompound peak was detected but did not meet quantification criteria; the reported value is the maximum possible concentration.
    UCompound was not detected at the reporting limit.
    MAA22_04_concentration
    Concentrations of polycyclic aromatic compounds. -9999, not detected at the reporting limit. (Source: Producer defined)
    Range of values
    Minimum:0.0300
    Maximum:1.13
    Units:nanograms per gram (ng/g) dry weight
    MAA22_04_reporting_limit
    Analytical reporting limits for polycyclic aromatic compounds in sediment. (Source: Producer defined)
    Range of values
    Minimum:0.0140
    Maximum:0.216
    Units:nanograms per gram (ng/g) dry weight
    MAA22_07_flag
    Analytical quality control (QC) codes. Flag codes separated by an underscore (_) indicate both conditions apply. (Source: Producer defined)
    ValueDefinition
    OKAll QC criteria were satisfied.
    JConcentration was less than the lowest calibration standard.
    KCompound peak was detected but did not meet quantification criteria; the reported value is the maximum possible concentration.
    UCompound was not detected at the reporting limit.
    MAA22_07_concentration
    Concentrations of polycyclic aromatic compounds. -9999, not detected at the reporting limit. (Source: Producer defined)
    Range of values
    Minimum:0.0750
    Maximum:10.2
    Units:nanograms per gram (ng/g) dry weight
    MAA22_07_reporting_limit
    Analytical reporting limits for polycyclic aromatic compounds in sediment. (Source: Producer defined)
    Range of values
    Minimum:0.0224
    Maximum:0.178
    Units:nanograms per gram (ng/g) dry weight
    LabBlank_02_flag
    Analytical quality control (QC) codes. Flag codes separated by an underscore (_) indicate both conditions apply. (Source: Producer defined)
    ValueDefinition
    OKAll QC criteria were satisfied.
    JConcentration was less than the lowest calibration standard.
    KCompound peak was detected but did not meet quantification criteria; the reported value is the maximum possible concentration.
    UCompound was not detected at the reporting limit.
    LabBlank_02_concentration
    Concentrations of polycyclic aromatic compounds. -9999, not detected at the reporting limit. (Source: Producer defined)
    Range of values
    Minimum:0.0200
    Maximum:0.641
    Units:nanograms per gram (ng/g) dry weight
    LabBlank_02_reporting_limit
    Analytical reporting limits for polycyclic aromatic compounds in sediment. (Source: Producer defined)
    Range of values
    Minimum:0.0102
    Maximum:0.0757
    Units:nanograms per gram (ng/g) dry weight
    SpikedMatrix_02_recovery
    Recovery of internal standards in a matrix-matched sample. -9999, not detected at the reporting limit. (Source: Producer defined)
    Range of values
    Minimum:94.8
    Maximum:128
    Units:percent
    Entity_and_Attribute_Overview: The first line of the csv file is a header line.
    Entity_and_Attribute_Detail_Citation: U.S. Geological Survey

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Renee K. Takesue
    • Kim Falinski
    • Amy Hodges
    • Mark Deakos
    • Curt D. Storlazzi
  2. Who also contributed to the data set?
    SGS-AXYS Analytical Services Ltd., Sidney, BC, measured PAHs.
  3. To whom should users address questions about the data?
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    Attn: PCMSC Science Data Coordinator
    2885 Mission Street
    Santa Cruz, CA

    831-427-4747 (voice)
    pcmsc_data@usgs.gov

Why was the data set created?

Olowalu Reef on the leeward shore of Maui, Hawaii, is the largest and best developed reef tract on the island and provides coral larvae for distal reefs. Olowalu Reef and its watershed are under increasing anthropogenic pressure in the form of land-based sediment and nutrient runoff, coral bleaching events, and frequent wildfires. Sediment provenance and wildfire contaminants were quantified in Olowalu watersheds and reef sediment to explore linkages between human activities, wildfire and potentially harmful runoff to Olowalu reef communities. Sixteen PAHs are listed by the United States Environmental Protection Agency (US EPA) as contaminants of concern due to their potential health effects and persistence in the environment. The USGS Coastal and Marine Hazards and Resources Program gratefully acknowledges funding for contaminant analyses from The Nature Conservancy and Maui Nui Marine Resource Council, and support from the Hawaii Association for Marine Education and Research, Inc.

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: 17-Feb-2022 (process 1 of 3)
    SEDIMENT COLLECTION: Sediment was collected from leeward Maui watersheds and Olowalu Reef in pre-cleaned amber glass jars in February 2022. Stream sediment was collected by hand with stainless steel sampling tools rinsed in ambient water between sites. Subaqueous reef sediment was scooped directly into jars. Samples were stored and transported frozen. Sample collection dates and coordinates are available in the accompanying file OlowaluWatershedReef2022_compositions.csv from this same data release.
    Date: 02-Jun-2023 (process 2 of 3)
    PARENT AND ALKYLATED POLYCYCLIC AROMATIC HYDROCARBON (PAH) CONCENTRATIONS: Approximately 30 grams of frozen sediment was sent to SGS AXYS Analytical Services Ltd. for quantification of 76 parent and alkylated polycyclic aromatic compounds (PACs), which include polycyclic aromatic hydrocarbons (PAHs), by method MLA-021. Sediment was spiked with surrogate standards, Soxhlet-extracted with dichloromethane, and cleaned up with column chromatography and activated copper. PACs were quantified by isotope dilution low resolution gas chromatography mass spectrometry in multiple ion detection mode to acquire data for target analytes and paired surrogates to minimize false positive identifications. Person who carried out this activity:
    Sean Campbell
    SGS AXYS Analytical Services Ltd.
    Project Manager
    2045 Mills Road West
    Sidney, BC

    250 655 5834 (voice)
    250 655 5811 (FAX)
    sean.campbell@sgs.com
    Date: 01-Apr-2024 (process 3 of 3)
    Edits were made to correct the field activity links in the Supplemental Information section. No data were changed. The metadata available from a harvester may supersede metadata bundled within a download file. Users are advised to compare the metadata date of this file to any similar file to ensure they are using the most recent version. (mau@usgs.gov)
  3. What similar or related data should the user be aware of?

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
    POLYCYCLIC AROMATIC HYDROCARBONS (PAHs): Quality Control (QC) measures for PAHs included external calibration curves, internal standards, lab blanks, and spiked matrix samples. All raw data are shown without censorship with corresponding QC flags and definitions. Flagged values represent maximum possible concentrations. Percent recoveries of PAH compounds in spiked matrix samples are acceptable between 50 percent and 150. PAH weights and concentrations are reported with three significant figures (XXX, XX.X, X.XX, 0.XXX, and 0.0XXX) rather than a fixed measurement resolution.
  2. How accurate are the geographic locations?
    The stated accuracy from the manufacturer for the Garmin handheld GPS used to record sediment collection locations is +/- 3 feet.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    Data set is complete
  5. How consistent are the relationships among the observations, including topology?
    No formal logical consistency tests were conducted.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
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.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey - ScienceBase
    Denver Federal Center, Building 810, Mail Stop 302
    Denver, CO

    1-888-275-8747 (voice)
    sciencebase@usgs.gov
  2. What's the catalog number I need to order this data set? These data are available in csv format (OlowaluWatershedReef2022_PAHs.csv) accompanied by CSDGM FGDC-compliant metadata.
  3. What legal disclaimers am I supposed to read?
    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.
  4. How can I download or order the data?
  5. What hardware or software do I need in order to use the data set?
    These data can be viewed with any text reader.

Who wrote the metadata?

Dates:
Last modified: 01-Apr-2024
Metadata author:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Attn: PCMSC Science Data Coordinator
2885 Mission Street
Santa Cruz, CA

831-427-4747 (voice)
pcmsc_data@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/DataReleases/ScienceBase/DR_P92N5DT3/OlowaluWatershedReef_2022_PAHs_metadata.faq.html>
Generated by mp version 2.9.51 on Fri Apr 5 13:49:23 2024