Metadata for Silver Bow Creek Estimated Tailings Saturation, 1994 Metadata for Silver Bow Creek Estimated Tailings Saturation, 1994

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Identification Information:

Citation:

Originator: Montana State Library

Publication date: 03/30/1994

Title: Silver Bow Creek Estimated Tailings Saturation, 1994

Publication place: Helena, Montana
Publisher: Montana State Library

Other citation details:

The former name of this data set on the NRIS web site was "ds33"

Larger Work Citation:

Title:: GIS Layers for Clark Fork Superfund Sites, Montana, 1988-2000
Online linkage: http://mslapps.mt.gov/Geographic_Information/Data/DataList/datalist_Details.aspx?did={33b14155-3366-42a0-b50c-1e21d5224fe0}

Abstract:

Estimated relationship between tailings identified along Silver Bow Creek and groundwater elevations. The layer contains zones that range from representing dry tailings that do not reach within two feet of the groundwater to saturated tailings whose depth is more than two feet below the groundwater surface.

The data were created by converting vector layers of tailings depth and groundwater elevation to raster format, subtracting the tailings depth from a digital elevation model of the land surface to create a "tailings bottom elevation" surface, and then finding the difference between the groundwater elevation surface and the tailings bottom elevation surface.

These data were formerly available from the Montana State Library web site but were removed because they are potentially out of date. Please contact the Federal Superfund Bureau of the Montana Department of Environmental Quality if you want these data so they may tell you if newer or better data are available. If the data are not available from the Department of Environmental Quality, you may request a copy from the Montana State Library data archive.

Time period of content:

Calendar date: 04/01/1993
Currentness reference: Ground Condition

Access constraints: None

Use constraints:

The Montana State Library provides this product/service for informational purposes only. The Library did not produce it for, nor is it suitable for legal, engineering, or surveying purposes. Consumers of this information should review or consult the primary data and information sources to ascertain the viability of the information for their purposes. The Library provides these data in good faith but does not represent or warrant its accuracy, adequacy, or completeness. In no event shall the Library be liable for any incorrect results or analysis; any direct, indirect, special, or consequential damages to any party; or any lost profits arising out of or in connection with the use or the inability to use the data or the services provided. The Library makes these data and services available as a convenience to the public, and for no other purpose. The Library reserves the right to change or revise published data and/or services at any time.

Point of contact:

Montana State Library
PO Box 201800
Helena, MT 59620-1800
Telephone: 406-444-5354
TDD/TTY telephone: Montana Relay 711
Fax: 406-444-0266
E-Mail: geoinfo@mt.gov

Data Quality Information:

Lineage:

Source information:

Originator: Horizons, Inc
Publication date: 06/15/1991
Title: 2-foot contours and spot elevations, photogrammetric data
Source scale denominator: 2400
Type of source media: Stable-base aerial photos
Source contribution:: The tailings thickness data was subtracted from this data to determine the elevation of the bottom of the tailings.
Calendar date: 06/15/1991

Source information:

Originator: Canonie Environmental
Publication date: 09/07/1993
Title: Silver Bow Creek tailings thickness isolines.
Source scale denominator: 2400
Type of source media: paper
Source contribution:: This is the source of the tailings extent and of the tailings thickness that was subtracted from the ground surface to develop a tailings bottom elevation surface.
Calendar date: 09/07/1993

Source information:

Originator: Canonie Environmental
Publication date: 07/22/1993
Title: Silver Bow Creek groundwater elevation isolines
Source scale denominator: 2400
Type of source media: paper
Source contribution:: This is the source of the groundwater elevation surface that was compared to the tailings bottom surface to estimate the extent of saturated tailings.
Calendar date: 07/22/1993

Process step:

Convert the 2-foot contours and spot elevation data to a 1-meter resolution Digital Elevation Model. This was performed with the Arc/Info Createtin command.


Process date: 12/16/1993

Process step:

Revise tailings depth isolines according to instructions from Canonie. Develop a DEM of tailings depth, assuming a uniform depth between the isolines equal to the mean depth of the bounding isolines.


Process date: 03/30/1994

Process step:

Subract the tailings thickness DEM from the land surface DEM to create a DEM representing the elevation of the bottom of the tailings deposits.


Process date: 03/30/1994

Process step:

Revise the groundwater elevation isolines according to instructions from Canonie. Create a DEM of the groundwater elevation, using arbitrarily input spot elevations to remove flat triangles generated by the Createtin command.


Process date: 03/30/1994

Process step:

Subtract the tailings bottom DEM from the ground water surface DEM to estimate the thickness of tailings saturated with groundwater.


Process date: 03/30/1994

Process step:

Convert the estimated saturated tailings grid to vector format: polygons of 1-foot interval estimated depth of saturation.


Process date: 03/30/1994

Spatial Data Organization Information:

Point and vector object information:

SDTS object type: GT-polygon composed of chains

SDTS object count: 22825

Spatial Reference Information:

Horizontal coordinate system definition:

Grid coordinate system name: State Plane Coordinate System 1983

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 distance units: meters

Geodetic model:

Horizontal datum name: North American Datum of 1983
Ellipsoid name: Geodetic Reference System 80
Semi-major axis: 6378137
Denominator of flattening ratio: 298.257

Entity and Attribute Information:

Entity type label: SilverBowCreekSaturatedTailings1994

Entity type definition: feature class

Attribute label: FID

Attribute definition: shapefile sequence number

Attribute label: Shape

Attribute definition: feature geometry

Attribute label: OBJECTID

Attribute definition: Unique Identifier generated when data was archived

Attribute label: Old_ID

Attribute definition:: Old Esri coverage-id number from the 16 original data sets that were combined to form the archive data layer

Attribute label: Grid-Code

Attribute definition: Code for depth to groundwater
Beginning date of attribute values: 19940330
Ending date of attribute values: 19940330

Distribution Information:

Distributor:

Montana State Library
PO Box 201800
Helena, MT 59620-1800
Telephone: 406-444-5354
TDD/TTY telephone: Montana Relay 711
Fax: 406-444-0266
E-Mail: geoinfo@mt.gov

Resource description: Offline Data

Distribution liability:

Metadata Reference Information:

Metadata date: 10/10/2014

Metadata review date: 05/13/1996

Metadata review date: 09/26/1996

Metadata contact:

Montana State Library
PO Box 201800
Helena, MT 59620-1800
Telephone: 406-444-5354
TDD/TTY telephone: Montana Relay 711
Fax: 406-444-0266
E-Mail: geoinfo@mt.gov