Identification_Information:
  Citation:
    Citation_Information:
      Originator: Montana Bureau of Mines and Geology (MBMG)
      Publication_Date: 20030109
      Title: Montana Ground-Water Information Center (GWIC): Water well data
      Geospatial_Data_Presentation_Form:  map
      Publication_Information
        Publication_Place:  Butte, Montana
        Publisher:          Montana Bureau of Mines and Geology
      Online_Linkage: http://nris.state.mt.us/mapper
      Online_Linkage: http://nris.state.mt.us/nsdi/nris/shape/gwicwells.zip
  Description:
    Abstract:
      This data set contains point locations and selected attributes for
      water wells within Montana abstracted from databases maintained at the
      Ground-Water Information Center (GWIC) at the Montana Bureau of Mines
      and Geology. Original data sources include water rights filings, water
      well logs, visits to water wells, and publications of the Montana Bureau
      of Mines and Geology, the U.S. Geological Survey, and others. The
      databases are maintained at the Ground-Water Information Center.
      Ground-water site locations and selected fields are forwarded quarterly
      to NRIS.

      Fields provided in this data set are a subset of the fields available in
      the database at the GWIC. Additional data for ground-water resources in
      Montana can be obtained from the GWIC website at http://mbmggwic.mtech.edu.
    Purpose:
      Data from GWIC are useful for describing the ground-water resources of
      Montana, land use planning, determination of drilling depths, and
      understanding ground-water flow.
  Time_Period_of_Content:
    Time_Period_Information:
      Range_of_Dates/Times:
        Beginning_Date: 1860
        Ending_Date: 20021217
    Currentness_Reference: ground condition
  Status:
    Progress:  Current with receipts of new water well logs
    Maintenance_and_Update_Frequency:
      The GWIC database is active and thousands of data corrections and
      thousands of new well logs are added to the system annually.  Updates
      of the database are forwarded quarterly to NRIS.
  Spatial_Domain:
    Bounding_Coordinates:
      West_Bounding_Coordinate: -116.17910165
      East_Bounding_Coordinate: -103.61192054
      North_Bounding_Coordinate: 49.03548084
      South_Bounding_Coordinate: 44.23794842
  Keywords:
    Theme:
      Theme_Keyword_Thesaurus: none
      Theme_Keyword: wells
      Theme_Keyword: well
      Theme_Keyword: ground water
      Theme_Keyword: ground-water
      Theme_Keyword: groundwater
    Place:
      Place_Keyword_Thesaurus: none
      Place_Keyword: Montana
  Access_Constraints:
    None
  Use_Constraints:
    These data are currently intended to provide information on the
    distribution of wells in general rather than the locations of specific
    wells.  Most of the well locations are derived from 1:250,000 scale maps
    and individual well identities should not be shown at map scales larger
    than this.

    Well data is updated continually at GWIC, and individual records at
    NRIS may be obsolete.  Current data for any well, or updated data sets,
    can be obtained directly from the GWIC website at
    http://mbmggwic.mtech.edu.
  Point_of_Contact:
    Contact_Information:
        Contact_Organization_Primary:
          Contact_Organization: Montana Bureau of Mines and Geology
          Contact_Person: Thomas Patton
        Contact_Address:
          Address_Type: mailing address
          Address: 1300 West Park Street
          City: Butte
          State_or_Province: MT
          Postal_Code: 59701
        Contact_Voice_Telephone: (406) 496-4153
        Contact_Electronic_Mail_Address: tpatton@mtech.edu

Data_Quality_Information:
  Attribute_Accuracy:
    Attribute_Accuracy_Report:
      New well log data are entered into the database from original documents
      and verified one time during the data entry process. Historic data are
      verified against historic documents on a county by county basis. Due to
      work loads, well records for all Montana counties have not been verified
      against the original documents. To view the current status of
      verification, go to the ‘On-Line Help’ section of the GWIC website at
      http://mbmggwic.mtech.edu.
  Logical_Consistency_Report:
    None
  Completeness_Report:
    Well locations in GWIC do not represent the locations of all water wells
    in Montana.  Although the total number of water wells constructed in the
    state is unknown, GWIC locations are thought to represent 50-60% of all
    water wells.
  Positional_Accuracy:
    Horizontal_Positional_Accuracy:
      Horizontal_Positional_Accuracy_Report:
        Unless otherwise noted in the GWIC database by the presence of a site
        visit record, coordinates are derived from unverified locations provided
        by the landowner or water well driller.  Significant errors in location
        occur in the unverified data.  Points with verified locations are
        generally within 10’s of feet of their true position.
 
        The GEOMETHOD attribute indicates how the coordinates were obtained and
        are an indicator of the positional accuracy of each point.  The meaning
        of commonly used GEOMETHOD codes are as follows:
          TRS-TWN:  generated from township, range, section, and tract using
                    township corners digitized by the U.S. Geological Survey
                    in the 1970s from 1:250,000 scale maps.
          TRS-SEC:  generated from township, range, section, and tract using
                    section corners digitized from 1:24,000 maps.
          NAV-GPS:  uncorrected Global Positioning System locations.
          SUR-GPS:  corrected Global Positioning System locations.
          MAP:      digitized from 1:24,000 USGS Topographic maps

        NAV-GPS, SUR-GPS, and MAP represent confirmed locations.  TRS-SEC and
        TRS-TWN represent unconfirmed locations if the number of tract
        designations in the TRACT field is less than 4 and there is no site
        visit record in the GWIC database.  A complete description of the
        GEOMETHOD flags can be found in the ‘On-Line Help’ section of the GWIC
        website at http://mbmggwic.mtech.edu.

        The coordinates for the majority of the wells were obtained with the
        TRS-TWN method.  Coordinates in selected counties (Flathead, Lake,
        Mineral, Missoula, Ravalli, Yellowstone, and Treasure) were obtained
        using the TRS-SEC method.  However, in both cases the greatest source
        of horizontal error is the original landowner/water well driller's
        ability to correctly fill out the township, range, section, and tract
        description. 

        Coordinates converted from township, range, section, and tract
        descriptions generally fall within the boundaries of the smallest
        described tract.  Section based conversions are more accurate than
        township based conversions because the section corners used in section
        based conversions have been digitized, and not interpolated from
        township corners.

  Lineage:
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator:
            Ground-Water Assessment Program at the
            Montana Bureau of Mines and Geology
          Publication_Date: 20030109
          Title: Montana Ground-Water Information Center:
                 Water well log data
          Publication_Information:
            Publication_Place: Butte
            Publisher: Montana Bureau of Mines and Geology
      Type_of_Source_Media: paper records
      Source_Time_Period_of_Content:
        Time_Period_Information:
          Range_of_Dates/Times:
            Beginning_Date: 1860
            Ending_Date: 20021217
        Source_Currentness_Reference: ground condition
      Source_Citation_Abbreviation: GWIC
      Source_Contribution:
        The data set was generated from this source.
    Process_Step:
      Process_Description:
        Water well log data are entered into the GWIC database from original
        paper documents and verified to match original data during the data
        entry process. Some well records are created from visits to wells
        discovered during field work by various projects at the Montana Bureau
        of Mines and Geology. For well records created from site visits, there
        will be no paper well log at the Montana Bureau of Mines and Geology and
        the database will only contain information discovered during the field
        visit. The database is corrected when errors are discovered through use
        of data or by outside data users.  
      Process_Date: 20030109
    Process_Step:
      Process_Description:
        Coordinates are assigned to GWIC records using a variety of methods
        as described by the GEOMETHOD flag in the data retrieval. See the
        description of common GEOMETHOD flags used in GWIC in the
        Horizontal_Positional_Accuracy_Report section of this document.

        TRS-TWN and TRS-SEC based coordinates are calculated automatically at
        the time a record is first filed or the location is modified. MAP,
        NAV-GPS, and SUR-GPS coordinates are posted to the database and
        remained unchanged until an error may be discovered. At that time
        corrected coordinates for the point would be entered into the database
        and the township, range, section and tract modified to match the
        digitized or GPS coordinates.
      Process_Date: 20030109
  
Spatial_Data_Organization_Information:
  Direct_Spatial_Reference_Method: Point
  Point_and_Vector_Object_Information:
    SDTS_Terms_Description:
      SDTS_Point_and_Vector_Object_Type:  Point
      Point_and_Vector_Object_Count: 180262

Spatial_Reference_Information:
  Horizontal_Coordinate_System_Definition
    Planar
      Grid_Coordinate_System
        Grid_Coordinate_System_Name: State Plane Coordinate System 1983
        State_Plane_Coordinate_System
          SPCS_Zone_Identifier: 2500
          Lambert_Conformal_Conic
            Standard_Parallel:  45
            Standard_Parallel:  49
            Longitude_of_Central_Meridian:  -109.5
            Latitude_of_Projection_Origin:  44.25
            False_Easting:   600000.00000
            False_Northing:  0.00000
      Planar_Coordinate_Information
        Planar_Coordinate_Encoding_Method:  coordinate pair
        Coordinate_Representation
          Abscissa_Resolution:  .1
          Ordinate_Resolution:  .1
        Planar_Distance_Units:  meters
    Geodetic_Model
      Horizontal_Datum_Name:  North American Datum of 1983
      Ellipsoid_Name:   Geodetic Reference System 80
      Semi-major_Axis:  6378137.0
      Denominator_of_Flattening_Ratio:  298.257

Entity_and_Attribute_Information:
  Overview_Description:
    Entity_and_Attribute_Overview:
      MNUMBER - The unique number that links all GWIC records together.
      DNRC_NO - Water right number assigned to well/site by the Department of
                Natural Resources and Conservation.
      SITE_NAME - Name of the well/site. Most often the name under which the
                  well was originally drilled.
      LATITUDE  - Latitude of well/site in decimal degrees.
      LONGITIDE - Longitude of well/site in decimal degrees.
      GEOMETHOD - Method used to determine the latitude and longitude.
           TRS-TWN = generated from township, range, section, and tract using
                     township corners digitized by the U.S. Geological Survey
                     in the 1970s from 1:250,000 scale maps.
           TRS-SEC = generated from township, range, section, and tract using
                     section corners digitized from 1:24,000 maps.
           NAV-GPS = uncorrected Global Positioning System locations.
           SUR-GPS = corrected Global Positioning System locations.
           MAP     = digitized from 1:24,000 USGS Topographic maps
      DATUM     - Geodetic datum for the latitude and longitude.
      TOWNSHIP  - The township in which the well/site is located.
      RANGE     - The range in which the well/site is located.
      ISP_SECT  - The section within the township/range in which the well
                  is located.
      TRACT     - The tracts (from largest to smallest) that describe the
                  location of the well/site.
           A = Northeast
           B = Northwest
           C = Southwest
           D = Southeast
      COUNTY - County in Montana where the well/site is located.
      TYPE - Whether the site is a water well, petroleum well, borehole,
             spring, or other site type.
      TOT_DEPT  - Total depth of the well - reported in feet.
      PWL       - The distance (feet) below land surface the water is found
                  during pumping.
      SWL       - The distance below (feet) land surface the water is found
                  when the well is not pumping.
      RECOV_WL  - The water level (below casing top in feet) measured by the
                  driller after a production test has been completed.
      YIELD     - The reported yield of the well in gallons per minute (gpm).
      TEST_TYPE - The method by which the yield was determined.
      TEST_DUR  - The length of the performance test in hours.
      RECOV_TM  - The length of time in hours after production stopped that
                  the recovery water level was measured.
      DRILL_SET - The distance below ground surface (in feet) that the drill
                  stem was placed during a production test using air to lift
                  the water from the well.
      WHO_DRILL - The name of the well driller or contractor.
      LIC_NO    - The water well driller or water well contractor
                  license number.
      COMP_DATE - The date that the well was completed.
      PWS_ID    - A number consisting of the Department of Environmental
                  Quality’s identifier for a public water supply (5 digits)
                  concatenated with the source number for the well/site in the
                  public water supply (3 digits).
      GWSI_ID   - A 15 digit number that is the U.S. Geological Survey’s
                  National Water Information System identifier for the
                  well/site.
      DATA_SOUR - The source of data for the GWIC record.
           GW4 = Declaration of Vested Groundwater Rights.
           LOG = Drillers log.
           INV = Visit to the well/site by personnel from the Montana Bureau of
                 Mines and Geology, the U.S. Geological Survey, or other agency.
           QW  = Visit to well/site by personnel from the Montana Bureau of
                 Mines and Geology, U.S. Geological Survey, or other agency to
                 collect a water sample. 

Distribution_Information:
  Distributor
    Contact_Information
      Contact_Organization_Primary
        Contact_Organization:  Montana State Library
        Contact_Person:        Gerry Daumiller
      Contact_Position:        Senior GIS Programmer
      Contact_Address
        Address_Type:  mailing and physical address
        Address:            1515 East 6th Avenue
        City:               Helena
        State_or_Province:  Montana
        Postal_Code:        59620-1800
        Country:            USA
      Contact_Voice_Telephone:          (406) 444-5358
      Contact_Facsimile_Telephone:      (406) 444-0581
      Contact_Electronic_Mail_Address:  gdaumiller@state.mt.us
      Hours_of_Service:  Monday-Friday, 8-5, Mountain Time
  Distribution_Liability:
    The user of this data set agrees to release The Montana Natural
    Resource Information System and the Montana Bureau of Mines and
    Geology, its officers, directors, agents, employees, and
    those acting on its behalf from all debts, claims, and liability of
    any kind arising out of or in connection with the use of the data.
  Standard_Order_Process
    Non-digital_Form:
      Contact the State Library to see if the data is
      available as hardcopy maps.
    Fees:
      For-profit organizations must pay our costs to reproduce the
      data.  Fees can be waived if doing Government work.
  Standard_Order_Process
    Digital_Form
      Digital_Transfer_Information
        Format_Name:            ESRI Shapefile
        Format_Version_Number:  3.0
      Digital_Transfer_Option
        Online_Option
          Computer_Contact_Information
            Network_Address
              Network_Resource_Name:  http://nris.state.mt.us/nsdi/nris/shape/gwicwells.zip
      Digital_Transfer_Option
        Offline_Option
          Offline_Media:     CD-ROM
          Recording_Format:  ISO 9660
    Fees:
      For-profit organizations must pay our costs to reproduce the
      data.  Fees can be waived if doing Government work

Metadata_Reference_Information:
  Metadata_Date: 20010822
  Metadata_Review_Date: 20030221
  Metadata_Contact:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: Montana Bureau of Mines and Geology
        Contact_Person: Thomas Patton
      Contact_Position: Program Leader, Montana Ground-Water Assessment Program
      Contact_Address:
        Address_Type:  mailing address
        Address: 1300 West Park Street
        City: Butte
        State_or_Province: MT
        Postal_Code: 59701
      Contact_Voice_Telephone: (406) 496-4153
      Contact_Electronic_Mail_Address: tpatton@mtech.edu
  Metadata_Standard_Name:
    FGDC Content Standards for Digital Geospatial Metadata
  Metadata_Standard_Version: 19940608
