Pamela L. Campbell Amy E. East Christopher H. Conaway 20220124 comma-delimited text data release DOI:10.5066/P9GB8YSZ Pacific Coastal and Marine Science Center, Santa Cruz, California U.S. Geological Survey https://doi.org/10.5066/P9GB8YSZ Pamela L. Campbell Amy E. East Christopher H. Conaway 2021 data release DOI:10.5066/P9GB8YSZ Pacific Coastal and Marine Science Center, Santa Cruz, CA U.S. Geological Survey https://doi.org/10.5066/P9GB8YSZ Polycyclic aromatic hydrocarbons (PAHs) are reported for water samples collected from the San Lorenzo River water during the rainy seasons from 2015 to 2016. Samples were collected during 2-, 5- and close to 10 year flood events. These data were collected and analyzed to determine possible concentration changes in contaminant load [polycyclic aromatic hydrocarbons (PAHs)] in the San Lorenzo River during the wet seasons following a multi-year drought. Additional information about the field activity from which some of these data were derived is available online at: https://cmgds.marine.usgs.gov/fan_info.php?fan=2017-606-FA Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. 20150928 20160315 ground condition at time data were collected Complete none planned -122.030833 -122.030833 36.9908333 36.9908333 ISO 19115 Topic Category inlandWaters Data Categories for Marine Planning Water-Quality Parameters USGS Thesaurus laboratory methods chemical analysis gas chromatography floods water quality suspended material (water) Marine Realms Information Bank (MRIB) keywords geochemistry water quality coastal pollution None U.S. Geological Survey USGS Coastal and Marine Hazards and Resources Program CMHRP Pacific Coastal and Marine Science Center PCMSC Organic Geochemistry USGS Metadata Identifier USGS:618aad62d34ec04fc9c6c664 Geographic Names Information System (GNIS) State of California Santa Cruz County San Lorenzo River None 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 and USGS California Water Science Center, Santa Cruz field office as the originators 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

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Santa Cruz CA 95060 831-427-4747 pcmsc_data@usgs.gov Agilent A/D ChemStation (version B.01) was used with Microsoft Windows XP Professional to acquire data. During data acquisition, all signals acquired by the analytical instrument are converted from analog signals to digital signals in the detector. The digital signal is transmitted to ChemStation electronically and stored in the signal data file. A data file comprises a group of files, by default stored in the subdirectory of the data folder with a .D extension. Conaway, C.H. Draut, A. E. Echols, K.R. Storlazzi, C.D Ritchie, A. 2013 Conaway, C.H., Draut, A.E., Echols, K.R., Storlazzi, C.D., and Ritchie, A., 2013, Episodic suspended sediment transport and elevated polycyclic aromatic hydrocarbon concentrations in a small, mountainous river in coastal California: River Research and Applications, vol. 29, p. 919-932. https://doi.org/10.1002/rra.2582 East, A.E. Stevens, A.W. Ritchie, A.C. Barnard, P.L. Campbell-Swarzenski, P.L. Collins, B.D. Conaway, C.H. 2013 East, A.E., Stevens, A.W., Ritchie, A.C., Barnard, P.L., Campbell-Swarzenski, P.L., Collins, B.D., and Conaway, C.H., 2018, A regime shift in sediment export from a coastal watershed during a record wet winter, California: Implications for landscape response to hydroclimatic extremes: Earth Surface Processes and Landforms, vol. 43, p. 2562-2577. https://doi.org/10.1002/esp.4415 Surrogate standards and an internal standard were used for validation, recoveries, and quantification of PAH concentrations. A method and instrument blank were added to each batch of water samples analyzed. No formal logical accuracy tests were conducted. Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. A formal accuracy assessment of the horizontal positional information in the data set has not been conducted. The horizontal accuracy is based on a hand-held Garmin GPS with a stated manufacturers accuracy of +/- 3.0 m River water samples were collected using a US D-95 water sampler, which was lowered throughout the water column by hand from a bridge-box platform beneath a pedestrian bridge in Santa Cruz, California located roughly 2 km upstream from the river mouth. The sampler was strategically deployed using a hand-operated reel winch to maintain a constant transit rate during sampling. Depth-integrated samples for PAH analysis were collected in acid-cleaned, methanol-dichlormethane (1:1, v:v) rinsed 1-liter Teflon bottles using a 0.64-cm (0.25-in.) diameter nozzle. Samples from the Teflon US D-95 bottles were carefully transferred to 4.0 L amber glass bottles which were pre-cleaned for trace organic and trace element sampling (I-CHEM). Repetitive samples were combined to provide the 4.0-liter volume for the PAH analyses. Samples were immediately transported to the USGS laboratory in Santa Cruz, California, where 30 mL of HPLC-grade dichloromethane (DCM) was added to the amber glass containers and the amber bottles were capped and inverted. The bottles were stored at 20-degrees Celsius until extraction. 20160319 P. L. Swarzenski U.S. Geological Survey, Pacific Coastal and Marine Science Center Geochemistry Laboratory Manager mailing and physical

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Santa Cruz CA 95060 831-888-7214 pswarzenski@usgs.gov point point 38 0.001 0.001 decimal degrees D_WGS_1984 D_WGS_1984 6378137.000000 298.257224 Attribute table comprised of a comma-delimited text file with the first line being a header line. Table containing attribute information associated with the dataset Producer defined Lab_ID Unique lab id given to each sample Producer defined YY-sample number, where YY is the 2-digit year of analysis followed by sequential numbering from the first sample of that year Date_of_Collection Day, month, and year sample was collected Producer defined 28-Sep-15 15-Mar-16 Dates in dd-mm-yy format. 1 Time_of_Sampling Time of day sample was collected Producer defined 00:00 23:59 hh:mm in 24-hr format 1 Latitude Latitude of sampling station in decimal degrees Producer defined 36.99083333 latitude of the sampling location producer defined Longitude Longitude of sampling station Producer defined -122.0308333 longitude of the sampling location producer defined milliliters_sampled Volume of river water sample collected Producer defined 2372 4273 milliliters 1 naphthalene Concentration for 2 ring PAH naphthalene Producer defined 0 54.1 ng/l 0.1 methyl_naphthalene Concentration for 2 ring PAH naphthalene Producer defined 0 15.1 nanogram per liter 0.1 acenaphthylene Concentration for 3 ring PAH acenaphthylene Producer defined 0 44.1 nanogram per liter 0.1 acenaphthene Concentration for 3 ring PAH acenaphthene Producer defined 0 40.0 nanogram per liter 0.1 fluorene Concentration for 3 ring PAH fluorene Producer defined 0 10.6 nanogram per liter 0.1 dibenzothiophene Concentration for 3 ring sulfur-containing PAH dibenzothiophene Producer defined 0 5.8 nanogram per liter 0.1 phenanthrene Concentration for 3 ring PAH phenanthrene Producer defined 0 30.2 nanogram per liter 0.1 anthracene Concentration for 3 ring PAH anthracene Producer defined 0 3.5 nanogram per liter 0.1 methyl_anthracene Concentration for 3 ring PAH alkylated anthracene Producer defined 0 5.6 nanogram per liter 0.1 methyl_phenanthrene Concentration for 3 ring PAH alkytlated phenanthrene Producer defined 0 7.9 nanogram per liter 0.1 methyl phenanthrene Concentration for 3 ring PAH alkytlated phenanthrene Producer defined 0 6.7 nanogram per liter 0.1 methyl_phenanthrene Concentration for 3 ring PAH alkytlated phenanthrene Producer defined 0 3.2 nanogram per liter 0.1 pyrene Concentration for 4 ring PAH pyrene Producer defined 0.1 170.0 nanogram per liter 0.1 fluoranthene Concentration for 4 ring PAH fluoranthene Producer defined 0.1 415.6 nanogram per liter 0.1 chrysene Concentration for 4 ring PAH chrysene Producer defined 0.0 23.1 nanogram per liter 0.1 benz(a)anthracene Concentration for 4 ring PAH benz(a)anthracene Producer defined 0.0 73.6 nanogram per liter 0.1 benzo(b)fluoranthene Concentration for 5 ring PAH benzo(b)fluoranthene Producer defined 0.0 51.1 nanogram per liter 0.1 benzo(k)fluoranthene Concentration for 5 ring PAH benzo(k)fluoranthene Producer defined 0.0 16.6 nanogram per liter 0.1 benzo(e)pyrene Concentration for 5 ring PAH benzo(e)pyrene Producer defined 0.0 30.1 nanogram per liter 0.1 benzo(a)pyrene Concentration for 5 ring PAH benzo(a)pyrene Producer defined 0.0 35.3 nanogram per liter 0.1 perylene 5 ring PAH perylene Producer defined 0.0 38.5 nanogram per liter 0.1 indeno(1,2,3-c,d)pyrene Concentration for 6 ring PAH indeno(1,2,3-c,d)pyrene Producer defined 0.0 31.7 nanogram per liter 0.1 dibenz(a,h)anthracene Concentration for 5 ring PAH dibenz(a,h)anthracene Producer defined 0.0 9.3 nanogram per liter 0.1 benzo(g,h,i)perylene Concentration for 6 ring PAH benzo(g,h,i)perylene Producer defined 0.0 42.1 nanogram per liter 0.1 The first line of the csv file is a header line. U.S. Geological Survey U.S. Geological Survey - ScienceBase mailing and physical

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Denver CO 80225 1-888-275-8747 sciencebase@usgs.gov SanLorenzoRiver_PAH_2015-2016.csv 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 version 2102 csv file of PAH data no compression applies 0.031 https://www.sciencebase.gov/catalog/file/get/618aad62d34ec04fc9c6c664 https://www.sciencebase.gov/catalog/item/618aad62d34ec04fc9c6c664 https://doi.org/10.5066/P9GB8YSZ Data can be downloaded using the Network_Resource_Name links. The first link is a direct link to download the zipped file of data and metadata. The second link points to a landing page with metadata and data. The third link points to the landing page for the entire data release. None. These data can be viewed with Excel software or any text-reading software. 20220124 U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

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