Polycyclic aromatic hydrocarbons (PAHs) in the San Lorenzo River, Santa Cruz, California, USA, from 2015 to 2016

Frequently anticipated questions:

• What does this data set describe?
  1. How might this data set be cited?
  2. What geographic area does the data set cover?
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
  7. How does the data set describe geographic features?
• Who produced the data set?
  1. Who are the originators of the data set?
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
• Why was the data set created?
• How was the data set created?
  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
  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?
  2. How accurate are the geographic locations?
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
  5. How consistent are the relationships among the data, including topology?
• How can someone get a copy of the data set?
  1. Are there legal restrictions on access or use of the data?
  2. Who distributes the data?
  3. What's the catalog number I need to order this data set?
  4. What legal disclaimers am I supposed to read?
  5. How can I download or order the data?
• Who wrote the metadata?

What does this data set describe?

1. How might this data set be cited?
   Campbell, Pamela L., East, Amy E., and Conaway, Christopher H., 20220124, Polycyclic aromatic hydrocarbons (PAHs) in the San Lorenzo River, Santa Cruz, California, USA, from 2015 to 2016: data release DOI:10.5066/P9GB8YSZ, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

   Online Links:

   • https://doi.org/10.5066/P9GB8YSZ

   This is part of the following larger work.
   Campbell, Pamela L., East, Amy E., and Conaway, Christopher H., 2021, Polycyclic aromatic hydrocarbons (PAHs) and suspended sediment concentrations in the San Lorenzo River, Santa Cruz, California, USA: data release DOI:10.5066/P9GB8YSZ, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

   Online Links:

   • https://doi.org/10.5066/P9GB8YSZ

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -122.030833
   East_Bounding_Coordinate: -122.030833
   North_Bounding_Coordinate: 36.9908333
   South_Bounding_Coordinate: 36.9908333
   

3. What does it look like?
4. Does the data set describe conditions during a particular time period?

   Beginning_Date: 28-Sep-2015

   Ending_Date: 15-Mar-2016

   Currentness_Reference:

   ground condition at time data were collected

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 (38)
   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 0.001. Longitudes are given to the nearest 0.001. Latitude and longitude values are specified in decimal degrees. The horizontal datum used is D_WGS_1984.
      The ellipsoid used is D_WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257224.
      
7. How does the data set describe geographic features?

   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 (Source: Producer defined)

   Lab_ID

   Unique lab id given to each sample (Source: 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 (Source: Producer defined)

   Range of values
   Minimum:	28-Sep-15
   Maximum:	15-Mar-16
   Units:	Dates in dd-mm-yy format.
   Resolution:	1

   Time_of_Sampling

   Time of day sample was collected (Source: Producer defined)

   Range of values
   Minimum:	00:00
   Maximum:	23:59
   Units:	hh:mm in 24-hr format
   Resolution:	1

   Latitude

   Latitude of sampling station in decimal degrees (Source: Producer defined)

   Value	Definition
   36.99083333	latitude of the sampling location

   Longitude

   Longitude of sampling station (Source: Producer defined)

   Value	Definition
   -122.0308333	longitude of the sampling location

   milliliters_sampled

   Volume of river water sample collected (Source: Producer defined)

   Range of values
   Minimum:	2372
   Maximum:	4273
   Units:	milliliters
   Resolution:	1

   naphthalene

   Concentration for 2 ring PAH naphthalene (Source: Producer defined)

   Range of values
   Minimum:	0
   Maximum:	54.1
   Units:	ng/l
   Resolution:	0.1

   methyl_naphthalene

   Concentration for 2 ring PAH naphthalene (Source: Producer defined)

   Range of values
   Minimum:	0
   Maximum:	15.1
   Units:	nanogram per liter
   Resolution:	0.1

   acenaphthylene

   Concentration for 3 ring PAH acenaphthylene (Source: Producer defined)

   Range of values
   Minimum:	0
   Maximum:	44.1
   Units:	nanogram per liter
   Resolution:	0.1

   acenaphthene

   Concentration for 3 ring PAH acenaphthene (Source: Producer defined)

   Range of values
   Minimum:	0
   Maximum:	40.0
   Units:	nanogram per liter
   Resolution:	0.1

   fluorene

   Concentration for 3 ring PAH fluorene (Source: Producer defined)

   Range of values
   Minimum:	0
   Maximum:	10.6
   Units:	nanogram per liter
   Resolution:	0.1

   dibenzothiophene

   Concentration for 3 ring sulfur-containing PAH dibenzothiophene (Source: Producer defined)

   Range of values
   Minimum:	0
   Maximum:	5.8
   Units:	nanogram per liter
   Resolution:	0.1

   phenanthrene

   Concentration for 3 ring PAH phenanthrene (Source: Producer defined)

   Range of values
   Minimum:	0
   Maximum:	30.2
   Units:	nanogram per liter
   Resolution:	0.1

   anthracene

   Concentration for 3 ring PAH anthracene (Source: Producer defined)

   Range of values
   Minimum:	0
   Maximum:	3.5
   Units:	nanogram per liter
   Resolution:	0.1

   methyl_anthracene

   Concentration for 3 ring PAH alkylated anthracene (Source: Producer defined)

   Range of values
   Minimum:	0
   Maximum:	5.6
   Units:	nanogram per liter
   Resolution:	0.1

   methyl_phenanthrene

   Concentration for 3 ring PAH alkytlated phenanthrene (Source: Producer defined)

   Range of values
   Minimum:	0
   Maximum:	7.9
   Units:	nanogram per liter
   Resolution:	0.1

   methyl phenanthrene

   Concentration for 3 ring PAH alkytlated phenanthrene (Source: Producer defined)

   Range of values
   Minimum:	0
   Maximum:	6.7
   Units:	nanogram per liter
   Resolution:	0.1

   methyl_phenanthrene

   Concentration for 3 ring PAH alkytlated phenanthrene (Source: Producer defined)

   Range of values
   Minimum:	0
   Maximum:	3.2
   Units:	nanogram per liter
   Resolution:	0.1

   pyrene

   Concentration for 4 ring PAH pyrene (Source: Producer defined)

   Range of values
   Minimum:	0.1
   Maximum:	170.0
   Units:	nanogram per liter
   Resolution:	0.1

   fluoranthene

   Concentration for 4 ring PAH fluoranthene (Source: Producer defined)

   Range of values
   Minimum:	0.1
   Maximum:	415.6
   Units:	nanogram per liter
   Resolution:	0.1

   chrysene

   Concentration for 4 ring PAH chrysene (Source: Producer defined)

   Range of values
   Minimum:	0.0
   Maximum:	23.1
   Units:	nanogram per liter
   Resolution:	0.1

   benz(a)anthracene

   Concentration for 4 ring PAH benz(a)anthracene (Source: Producer defined)

   Range of values
   Minimum:	0.0
   Maximum:	73.6
   Units:	nanogram per liter
   Resolution:	0.1

   benzo(b)fluoranthene

   Concentration for 5 ring PAH benzo(b)fluoranthene (Source: Producer defined)

   Range of values
   Minimum:	0.0
   Maximum:	51.1
   Units:	nanogram per liter
   Resolution:	0.1

   benzo(k)fluoranthene

   Concentration for 5 ring PAH benzo(k)fluoranthene (Source: Producer defined)

   Range of values
   Minimum:	0.0
   Maximum:	16.6
   Units:	nanogram per liter
   Resolution:	0.1

   benzo(e)pyrene

   Concentration for 5 ring PAH benzo(e)pyrene (Source: Producer defined)

   Range of values
   Minimum:	0.0
   Maximum:	30.1
   Units:	nanogram per liter
   Resolution:	0.1

   benzo(a)pyrene

   Concentration for 5 ring PAH benzo(a)pyrene (Source: Producer defined)

   Range of values
   Minimum:	0.0
   Maximum:	35.3
   Units:	nanogram per liter
   Resolution:	0.1

   perylene

   5 ring PAH perylene (Source: Producer defined)

   Range of values
   Minimum:	0.0
   Maximum:	38.5
   Units:	nanogram per liter
   Resolution:	0.1

   indeno(1,2,3-c,d)pyrene

   Concentration for 6 ring PAH indeno(1,2,3-c,d)pyrene (Source: Producer defined)

   Range of values
   Minimum:	0.0
   Maximum:	31.7
   Units:	nanogram per liter
   Resolution:	0.1

   dibenz(a,h)anthracene

   Concentration for 5 ring PAH dibenz(a,h)anthracene (Source: Producer defined)

   Range of values
   Minimum:	0.0
   Maximum:	9.3
   Units:	nanogram per liter
   Resolution:	0.1

   benzo(g,h,i)perylene

   Concentration for 6 ring PAH benzo(g,h,i)perylene (Source: Producer defined)

   Range of values
   Minimum:	0.0
   Maximum:	42.1
   Units:	nanogram per liter
   Resolution:	0.1

   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)
   • Pamela L. Campbell
   • Amy E. East
   • Christopher H. Conaway
2. Who also contributed to the data set?
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?

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.

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: 19-Mar-2016 (process 1 of 1)

   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. Person who carried out this activity:
   

   P. L. Swarzenski

   U.S. Geological Survey, Pacific Coastal and Marine Science Center

   Geochemistry Laboratory Manager

   2885 Mission St.

   Santa Cruz, CA
   

   831-888-7214 (voice)

   pswarzenski@usgs.gov

3. What similar or related data should the user be aware of?
   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..

   Online Links:

   • https://doi.org/10.1002/rra.2582

   Other_Citation_Details:

   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.

   East, A.E., Stevens, A.W., Ritchie, A.C., Barnard, P.L., Campbell-Swarzenski, P.L., Collins, B.D., and Conaway, C.H., 2013, A regime shift in sediment export from a coastal watershed during a record wet winter, California: Implications for landscape response to hydroclimatic extremes..

   Online Links:

   • https://doi.org/10.1002/esp.4415

   Other_Citation_Details:

   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.

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

1. How well have the observations been checked?
   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.
2. How accurate are the geographic locations?
   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
3. How accurate are the heights or depths?
   
4. Where are the gaps in the data? What is missing?
   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.
5. How consistent are the relationships among the observations, including topology?
   No formal logical accuracy 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 and USGS California Water Science Center, Santa Cruz field office as the originators 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? SanLorenzoRiver_PAH_2015-2016.csv
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?
   • Availability in digital form:

     Data format:	csv file of PAH data in format comma-delimited text (version version 2102) Size: 0.031
     Network links:	https://www.sciencebase.gov/catalog/file/get/618aad62d34ec04fc9c6c664 https://www.sciencebase.gov/catalog/item/618aad62d34ec04fc9c6c664 https://doi.org/10.5066/P9GB8YSZ

   • Cost to order the data: None.

5. What hardware or software do I need in order to use the data set?

   These data can be viewed with Excel software or any text-reading software.

Who wrote the metadata?

Dates:

Last modified: 24-Jan-2022

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)