Summit crater lake observations, and the location, chemistry, and pH of water samples near Mount Chiginagak volcano, Alaska: 2004-2012

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Frequently anticipated questions:

What does this data set describe?

Title:
Summit crater lake observations, and the location, chemistry, and pH of water samples near Mount Chiginagak volcano, Alaska: 2004-2012
Abstract:
Following the May 2005 acid crater lake flood at Chiginagak volcano, DGGS has been monitoring crater lake water that flows into Indecision Creek, Mother Goose Lake, and the King Salmon River. This data table provides information on water samples collected between 2005 and 2012 near Chiginagak volcano, including: sample ID, latitude, longitude, location description, pH, and cation and anion chemistry results.
Supplemental_Information:
Usage note: This spreadsheet has been optimized for use with MS Excel. Users who may be interested working with this data with other software should be prepared to resolve numerous errors relating to attribute field names that are longer than ten characters, data fields containing both text and numeric characters, and data fields that may not import correctly. The DGGS metadata standard extends the FGDC standard to also include several elements that are required to facilitate our internal data management. These elements relate individual data items to a common dataset. This dataset describes a single layer titled: > Table_2_Chiginagak_water_chemistry_pH_2005-2012: Data table describing sample location, pH, conductivity, and chemistry
  1. How should this data set be cited?

    Schaefer, J.R., Scott, W.E., Evans, W.C., Wang, Bronwen, and McGimsey, R.G., 2013, Summit crater lake observations, and the location, chemistry, and pH of water samples near Mount Chiginagak volcano, Alaska: 2004-2012: Report of Investigations RI 2011-6 v. 2, State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys, Fairbanks, AK, USA.

    Online Links:

    Other_Citation_Details: 25 p.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -157.667945
    East_Bounding_Coordinate: -156.977508
    North_Bounding_Coordinate: 57.277643
    South_Bounding_Coordinate: 57.091514

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Beginning_Date: 2005
    Ending_Date: 2012
    Currentness_Reference: ground condition

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: ASCII tabular files

  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.

    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 World Geodetic System of 1984.
      The ellipsoid used is World Geodetic System of 1984.
      The semi-major axis of the ellipsoid used is 6378137.
      The flattening of the ellipsoid used is 1/298.25722210088.

  7. How does the data set describe geographic features?

    Table_2_Chiginagak_water_chemistry_pH_2005-2012.csv
    Data table describing sample location, pH, conductivity, and chemistry (Source: This report)

    StationID
    Unique Station Identifier (Source: This report)

    Unique Station Identifier

    Map_Label_Chig_pub2
    Map Label on Figure 1 of the report manuscript (Source: This report)

    Map Label

    Longdd_wgs84
    Longitude in decimal degrees; WGS84 datum (Source: This report)

    Range of values
    Minimum:-157.667945
    Maximum:-156.977527

    Latdd_wgs84
    Latitude; WGS 84 datum (Source: This report)

    Range of values
    Minimum:57.091514
    Maximum:57.277643

    Geologist
    Name of person who collected the sample (Source: This report)

    Geologist Name in the format: last name, first name middle name or middle initial

    DateVisited
    Date of station visit (Source: This report)

    Range of values
    Minimum:20-Aug-05
    Maximum:27-Sep-12

    LocationDescription
    Text description of station location (Source: This report)

    Text description of station location. NULL (blank) values indicate that a description was not provided by the geologist who collected the sample.

    TextDescription
    Text description of sample (Source: This report)

    Text description of sample. NULL (blank) values indicate that a description was not provided by the geologist who collected the sample.

    pH
    pH value (Source: This report)

    Range of values
    Minimum:1.2
    Maximum:7.78

    Blanks (NULL values) or zero values indicate no pH was taken

    8.4*Suspect pH value. See column "Text Description" for explanation

    In the case of two numbers separated by a dash, the ph value falls within the specified range.

    T_air
    Air temperature in degrees Celsius (Source: This report)

    Range of values
    Minimum:10.0
    Maximum:17.2
    Units:degrees Celsius

    Blanks (NULL values) or zero values indicate no temperature reading was recorded

    T_water
    Temperature of water in degrees Celsius (Source: This report)

    Range of values
    Minimum:1.6
    Maximum:65.7
    Units:degrees Celsius

    Blanks (NULL values) or zero values indicate no air temperature was taken

    T_water_pHmeter
    Temperature of water in degrees Celsius recorded by a pH meter (Source: This report)

    Range of values
    Minimum:1.3
    Maximum:48.8
    Units:degrees Celsius

    Blanks (NULL values) or zero values indicate temperature was not taken with pH meter

    T_air_pHmeter
    Temperature of the air in degrees Celsius recorded with the pH meter (Source: This report)

    Range of values
    Minimum:10.6
    Maximum:14.6
    Units:degrees Celsius

    Blanks (NULL values) or zero values indicate no air temperature reading was taken with the pH meter

    Conductivity
    Conductivity measured in microSiemens (Source: This report)

    Range of values
    Minimum:43
    Maximum:2580
    Units:microSiemens

    The values 900-1,170 and 968+ indicate that the conductivity meter would not stabilize on a single value, thus an approximate value is given for these two samples

    Blanks (NULL values) or zero values indicate conductivity was not measured

    lab_no
    ICP-MS laboratory-assigned sample number (Source: This report)

    ICP-MS laboratory-assigned sample number

    Blanks (NULL values) or zero values indicate that the ICP-MS laboratory-assigned sample number was not retained by DGGS/AVO staff.

    Ag
    Silver (Source: This report)

    ValueDefinition
    < 1below detection limit for samples run after 2006
    < 3below detection limit for samples run in 2006

    Blanks (NULL values) or zero values indicate no sample analyzed

    Al
    Aluminum (Source: This report)

    ValueDefinition
    < 2below detection limit
    nrnot analyzed

    Range of values
    Minimum:2.1
    Maximum:59,300
    Units:micrograms per Liter

    Blanks (NULL values) or zero values indicate no sample analyzed

    As
    Arsenic (Source: This report)

    ValueDefinition
    < 1below detection limit

    Range of values
    Minimum:1.1
    Maximum:27.1
    Units:micrograms per Liter

    Blanks (NULL values) or zero values indicate no sample analyzed

    Ba
    Barium (Source: This report)

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.74
    Maximum:45.4
    Units:micrograms per Liter

    Be
    Beryllium (Source: This report)

    ValueDefinition
    < 0.05below detection limit

    Range of values
    Minimum:0.05
    Maximum:0.9
    Units:micrograms per Liter

    Blanks (NULL values) or zero values indicate no sample analyzed

    Bi
    Bismuth (Source: This report)

    ValueDefinition
    < 0.2below detection limit

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.38
    Maximum:0.38
    Units:micrograms per Liter

    Ca_mgl
    Calcium (Source: This report)

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:3.26
    Maximum:247
    Units:milligrams per Liter

    Cd
    Cadmium (Source: This report)

    ValueDefinition
    < 0.02below detection limit

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.02
    Maximum:1.52
    Units:micrograms per Liter

    Ce
    Cerium (Source: This report)

    ValueDefinition
    < 0.01below detection limit

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.01
    Maximum:31.6
    Units:microgram per Liter

    Co
    Cobalt (Source: This report)

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.03
    Maximum:44.2
    Units:micrograms per Liter

    Cr
    Chromium (Source: This report)

    ValueDefinition
    < 1Less than detection limit

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:1
    Maximum:10.2
    Units:micrograms per Liter

    Cs
    Cesium (Source: This report)

    ValueDefinition
    < 0.02below detection limit

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.02
    Maximum:8.48
    Units:micrograms per Liter

    Cu
    Copper (Source: This report)

    ValueDefinition
    < 0.5below detection limit

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.54
    Maximum:39.8
    Units:micrograms per Liter

    Dy
    Dysprosium (Source: This report)

    ValueDefinition
    < 0.005below detection limit

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.007
    Maximum:4.72
    Units:micrograms per Liter

    Er
    Erbium (Source: This report)

    ValueDefinition
    < 0.005below detection limit

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.007
    Maximum:2.46
    Units:micrograms per Liter

    Eu
    Europium (Source: This report)

    ValueDefinition
    < 0.005below detection limit

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.005
    Maximum:0.97
    Units:micrograms per Liter

    Fe
    Iron (Source: This report)

    ValueDefinition
    < 50below detection limit

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:52
    Maximum:40,200
    Units:micrograms per Liter

    Ga
    Gallium (Source: This report)

    ValueDefinition
    < 0.05below detection limit

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.05
    Maximum:5.4
    Units:micrograms per Liter

    Gd
    Gadolinium (Source: This report)

    ValueDefinition
    < 0.005below detection limit

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.008
    Maximum:6.39
    Units:micrograms per Liter

    Ge
    Germanium (Source: This report)

    ValueDefinition
    < 0.05below detection limit
    nanot analyzed

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.05
    Maximum:8.4
    Units:micrograms per Liter

    Ho
    Holmium (Source: This report)

    ValueDefinition
    < 0.005below detection limit

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.007
    Maximum:0.91
    Units:micrograms per Liter

    K_mgl
    Potassium (Source: This report)

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.2
    Maximum:49.9
    Units:milligrams per Liter

    La
    Lanthanum (Source: This report)

    ValueDefinition
    < 0.01below detection limit

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.01
    Maximum:12
    Units:micrograms per Liter

    Li
    Lithium (Source: This report)

    ValueDefinition
    < 0.01below detection limit

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.2
    Maximum:161
    Units:micrograms per Liter

    Lu
    Lutetium (Source: This report)

    ValueDefinition
    < 0.1below detection limit
    nanot analyzed

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.1
    Maximum:0.3
    Units:micrograms per Liter

    Mg_mgl
    Magnesium (Source: This report)

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.64
    Maximum:172
    Units:milligrams per Liter

    Mn
    Manganese (Source: This report)

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:3.7
    Maximum:1,820
    Units:micrograms per Liter

    Mo
    Molybdenum (Source: This report)

    ValueDefinition
    < 2less than detection limit

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:2.6
    Maximum:3.2
    Units:micrograms per Liter

    Na_mgl
    Sodium (Source: This report)

    ValueDefinition
    nrnot analyzed

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:1
    Maximum:177
    Units:milligrams per Liter

    Nb
    Niobium (Source: This report)

    ValueDefinition
    < 0.2below detection limit

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.29
    Maximum:1.19
    Units:micrograms per Liter

    Nd
    Neodymium (Source: This report)

    ValueDefinition
    < 0.01below detection limit

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.01
    Maximum:21
    Units:micrograms per Liter

    Ni
    Nickel (Source: This report)

    ValueDefinition
    < 0.4below detection limit

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.5
    Maximum:28.1
    Units:micrograms per Liter

    P_mgl
    Phosphorous (Source: This report)

    ValueDefinition
    < 0.01below detection limit

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.01
    Maximum:0.6
    Units:milligrams per Liter

    Pb
    Lead (Source: This report)

    ValueDefinition
    < 0.05below detection limit

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.05
    Maximum:3.8
    Units:micrograms per Liter

    Pr
    Praseodymium (Source: This report)

    ValueDefinition
    < 0.01below detection limit

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.01
    Maximum:4.58
    Units:micrograms per Liter

    Rb
    Rubidium (Source: This report)

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.24
    Maximum:88.7
    Units:micrograms per Liter

    Sb
    Antimony (Source: This report)

    ValueDefinition
    < 0.3below detection limit

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.34
    Maximum:1.19
    Units:micrograms per Liter

    Sc
    Scandium (Source: This report)

    ValueDefinition
    < 0.6below detection limit

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.6
    Maximum:34.6
    Units:micrograms per Liter

    Se
    Selenium (Source: This report)

    ValueDefinition
    < 1below detection limit

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:1
    Maximum:8
    Units:micrograms per Liter

    SiO2_mgl
    Silicon dioxide (Source: This report)

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:3.9
    Maximum:179
    Units:milligrams per Liter

    Sm
    Samarium (Source: This report)

    ValueDefinition
    < 0.01below detection limit

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.01
    Maximum:4.89
    Units:micrograms per Liter

    SO4_mgl
    Sulfate (Source: This report)

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:9
    Maximum:762
    Units:milligrams per Liter

    Sr
    Strontium (Source: This report)

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:9.18
    Maximum:753
    Units:micrograms per Liter

    Ta
    Tantalum (Source: This report)

    ValueDefinition
    < 0.02below detection limit

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.02
    Maximum:0.34
    Units:micrograms per Liter

    Tb
    Terbium (Source: This report)

    ValueDefinition
    < 0.005below detection limit

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.005
    Maximum:4.5
    Units:micrograms per Liter

    Th
    Thorium (Source: This report)

    ValueDefinition
    < 0.2below detection limit

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.23
    Maximum:0.63
    Units:micrograms per Liter

    Ti
    Titanium (Source: This report)

    ValueDefinition
    < 0.5below detection limit

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.5
    Maximum:17.4
    Units:micrograms per Liter

    Tl
    Thallium (Source: This report)

    ValueDefinition
    < 0.1below detection limit

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.1
    Maximum:2
    Units:micrograms per Liter

    Tm
    Thulium (Source: This report)

    ValueDefinition
    < 0.005below detection limit

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.008
    Maximum:0.31
    Units:micrograms per Liter

    U
    Uranium (Source: This report)

    ValueDefinition
    < 0.1below detection limit

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.1
    Maximum:0.34
    Units:micrograms per Liter

    V
    Vanadium (Source: This report)

    ValueDefinition
    < 0.5below detection limit

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.5
    Maximum:103
    Units:micrograms per Liter

    W
    Tungsten (Source: This report)

    ValueDefinition
    < 0.5below detection limit

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.75
    Maximum:2
    Units:micrograms per Liter

    Y
    Yitrium (Source: This report)

    ValueDefinition
    < 0.01below detection limit for samples run in 2010

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.01
    Maximum:23.6
    Units:micrograms per Liter

    Yb
    Ytterbium (Source: This report)

    ValueDefinition
    < 0.005below detection limit for samples run prior to 2010
    < 0.01below detection limit for samples run in 2010

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.005
    Maximum:1.96
    Units:micrograms per Liter

    Zn
    Zinc (Source: This report)

    ValueDefinition
    < 3below detection limit

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.9
    Maximum:156
    Units:micrograms per Liter

    Zr
    Zirconium (Source: This report)

    ValueDefinition
    < 0.2below detection limit
    nanot analyzed

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.4
    Maximum:0.5
    Units:micrograms per Liter

    F
    Fluoride (Source: This report)

    ValueDefinition
    < 0.05below detection limit

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.03
    Maximum:18
    Units:micrograms per Liter

    Cl
    Chloride (Source: This report)

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:1.16
    Maximum:466
    Units:micrograms per Liter

    SO4
    sulfate (Source: This report)

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:10.8
    Maximum:622
    Units:micrograms per Liter

    Br
    Bromide (Source: This report)

    ValueDefinition
    < 0.05below detection limit
    < 0.02below detection limit
    < 0.01below detection limit
    bdlbelow detection limit

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.006
    Maximum:0.66
    Units:micrograms per Liter

    NO3_N
    Nitrate (Source: This report)

    ValueDefinition
    < 0.1below detection limit
    < 0.05below detection limit
    < 0.04below detection limit
    < 0.01below detection limit

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.01
    Maximum:1
    Units:micrograms per Liter

    PO4_P
    Phosphate (Source: This report)

    ValueDefinition
    < 0.2below detection limit
    < 0.1below detection limit
    < 0.08below detection limit
    < 0.05below detection limit
    < 0.04below detection limit
    < 0.02below detection limit
    < 0.01below detection limit

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:0.01
    Maximum:0.16
    Units:micrograms per Liter

    HCO3_alk
    bicarbonate (Source: This report)

    ValueDefinition
    < 5below detection limit
    acidpH of sample less than 5.5; alkalinity not analyzed

    Blanks (NULL values) or zero values indicate no sample analyzed

    Range of values
    Minimum:5
    Maximum:408
    Units:micrograms per Liter

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

    This work was made possible with funding from the U.S. Geological Survey's Volcano Hazard Program as well as the U.S. Department of Interior, Fish and Wildlife Service (USFWS).

  3. To whom should users address questions about the data?

    Alaska Division of Geological & Geophysical Surveys
    GIS Analyst
    3354 College Road
    Fairbanks, AK 99709-3707
    USA

    (907)451-5029 (voice)
    dggsgis@alaska.gov

    Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays

Why was the data set created?

The purpose of this data release is to document the sample ID, latitude, longitude, location description, pH, and cation and anion chemistry results of water samples near Chiginagak volcano.

How was the data set created?

  1. From what previous works were the data drawn?

    Lamothe et al.,(2002) (source 1 of 1)
    Lamothe, P.J., Meier, A.L., and Wilson, S.A., 2002, The determination of forty-four elements in aqueous samples by inductively coupled plasma-mass spectrometry, in Analytical methods for chemical Analysis of Geologic and other Material, ed. Taggart: U.S. Geological Survey Open File Report OFR 02-223, U.S. Geological Survey, Denver, Colorado.

    Type_of_Source_Media: paper
    Source_Contribution:
    inductively coupled plasma mass spectrometry (ICP-MS) procedures

  2. How were the data generated, processed, and modified?

    Date: 2011 (process 1 of 2)
    Latitude and longitude information was collected using various hand-held GPS units. Location coordinates were recorded in a field notebook and subsequently transferred to the project database. The pH values were measured in the field using various digital pH meters. The pH meter was calibrated at least once per day using a 2- to 3-point calibration with pH standards of 4, 7, and 10. Surface water samples taken for cation and anion analysis were filtered in the field using a 0.45 micron filter and peristaltic pump, following standard clean techniques. Anion concentrations were determined at the U.S. Geological Survey (USGS) laboratories in Menlo Park, California using a DIONEX ICS-2000 ion chromatograph with hydroxide eluent. Alkalinity (as bicarbonate) was analyzed by potentiometric titration on samples with pH > 5.Samples that contain more than about 100 mg/L of any one analyte are diluted prior to analysis, resulting in more than one detection limit per analyte. In some cases "bdl" is used as the default "below detection limit" indicator. If concentrations of analytes were high (generally >100 mg/L) major cation and trace element concentrations were determined at the USGS Mineral Program laboratories in Denver, Colorado, by inductively coupled plasma mass spectrometry (ICP-MS) using procedures described by Lamothe et al.,(2002).

    Data sources used in this process:

    • Lamothe et al.,(2002)

    Date: 2013 (process 2 of 2)
    Additional data collected and received after the initial publication date were added to the digital data distribution file. The original report is superseded by this version.

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

    Schaefer, J.R., Scott, W.E., Evans, W.C., Wang, Bronwen, and McGimsey, R.G., 2011, Summit crater lake observations, and the location, chemistry, and pH of water samples near Mount Chiginagak volcano, Alaska: 2004-2011: Report of Investigation RI 2011-6, Alaska Division of Geological & Geophysical Surveys, Fairbanks, Alaska, United States.

    Online Links:

    Other_Citation_Details: 25 p., 1 DVD

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

  1. How well have the observations been checked?

    Attribute values listed in the final table were checked for consistency by cross-referencing field data sheets and laboratory chemical results as well as plotting the locations in ArcGIS software. Usage note: This spreadsheet has been optimized for use with MS Excel. Users who may be interested working with this data with other software should be prepared to resolve numerous errors relating to attribute field names that are longer than ten characters, data fields containing both text and numeric characters, and data fields that may not import correctly.

  2. How accurate are the geographic locations?

    Horizontal positions (latitude and longitude) were determined with handheld GPS receivers. Although in most cases latitude and longitude are given in decimal degrees to 5 decimal places, the accuracy of this position is likely more coarse, as a GPS station may have been taken 20 meters or more from the exact site in the stream where the water sample was actually taken. Users reoccupying the sampling sites should use care to read the location description information to determine what stream corresponds to what sample site, especially near confluences.

  3. How accurate are the heights or depths?

  4. Where are the gaps in the data? What is missing?

    Conductivity, pH, temperature, and chemical samples were not collected at all sites. At some sites, only pH paper was available, thus a range of pH is given versus sites where pH was taken with a digital pH meter. In the latter case, pH is given to the nearest 1/10th.

  5. How consistent are the relationships among the observations, including topology?

    Not applicable.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints:
This report, map, and/or dataset is available directly from the State of Alaska, Department of Natural Resources, Division of Geological & Geophysical Surveys (see contact information below).
Use_Constraints:
Any hard copies or published datasets utilizing these datasets shall clearly indicate their source. If the user has modified the data in any way, the user is obligated to describe the types of modifications the user has made. The user specifically agrees not to misrepresent these datasets, nor to imply that changes made by the user were approved by the State of Alaska, Department of Natural Resources, Division of Geological &amp; Geophysical Surveys. The State of Alaska makes no express or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.

  1. Who distributes the data set? (Distributor 1 of 1)

    Alaska Division of Geological & Geophysical Surveys
    3354 College Road
    Fairbanks, AK 99709-3707
    USA

    (907)451-5020 (voice)
    (907)451-5050 (FAX)
    dggspubs@alaska.gov

    Hours_of_Service: 8 am to 4:30 pm, Monday through Friday, except State holidays
    Contact_Instructions:
    Please view our website (<http://www.dggs.alaska.gov>) for the latest information on available data. Please contact us using the e-mail address provided above when possible.
  2. What's the catalog number I need to order this data set?

    RI 2011-6 v. 2

  3. What legal disclaimers am I supposed to read?

    The State of Alaska makes no expressed or implied warranties (including warranties for merchantability and fitness) with respect to the character, functions, or capabilities of the electronic data or products or their appropriateness for any user's purposes. In no event will the State of Alaska be liable for any incidental, indirect, special, consequential, or other damages suffered by the user or any other person or entity whether from the use of the electronic services or products or any failure thereof or otherwise. In no event will the State of Alaska's liability to the Requestor or anyone else exceed the fee paid for the electronic service or product.

  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 27-Sep-2013
Metadata author:
Metadata manager
3354 College Road
Fairbanks, AK 99709-3707
USA

(907)451-5020 (voice)

Metadata standard:
FGDC Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:

Generated by mp version 2.9.21 on Fri Sep 27 13:43:55 2013