Montana State Library 19940330 Helena, Montana Montana State Library The former name of this data set on the NRIS web site was "ds33" https://ftpgeoinfo.msl.mt.gov/Data/Spatial/NonMSDI/Collections/Clark_Fork_Superfund/SilverBowCreekSaturatedTailings1994.zip http://mslapps.mt.gov/Geographic_Information/Data/DataList/datalist_Details.aspx?did={33b14155-3366-42a0-b50c-1e21d5224fe0} 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data were formerly available from the Montana State Library web site but were removed because they are potentially out of date.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. 19930401 Ground Condition -112.809998 -112.570000 46.1300011 45.9900017 -112.794,46.1244,-112.7664,46.0181,-112.5583,46.0048,-112.5594,45.9922,-112.8133,46.0026,-112.8162,46.125,-112.794,46.1244 ISO 19115 Topic Category environment tailings Montana Butte Silver Bow None 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. Montana State Library mailing address

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Helena MT 59620-1800 406-444-5354 Montana Relay 711 406-444-0266 geoinfo@mt.gov Horizons, Inc 19910615 map Rapid City, SD Horizons, Inc. 2400 Stable-base aerial photos 19910615 Publication Date horz The tailings thickness data was subtracted from this data to determine the elevation of the bottom of the tailings. Canonie Environmental 19930907 map Bozeman, MT Canonie Environmental 2400 paper 19930907 Publication Date tail 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. Canonie Environmental 19930722 map Bozeman, MT Canonie Environmental 2400 paper 19930722 Publication Date gndw This is the source of the groundwater elevation surface that was compared to the tailings bottom surface to estimate the extent of saturated tailings. 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. horz 19931216 land 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. tail 19940330 tldm Subract the tailings thickness DEM from the land surface DEM to create a DEM representing the elevation of the bottom of the tailings deposits. land tldm 19940330 tbot 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. gndw 19940330 gdem Subtract the tailings bottom DEM from the ground water surface DEM to estimate the thickness of tailings saturated with groundwater. tldm gdem 19940330 sdem Convert the estimated saturated tailings grid to vector format: polygons of 1-foot interval estimated depth of saturation. sdem 19940330 fin GT-polygon composed of chains 22825 State Plane Coordinate System 1983 2500 45 49 -109.5 44.25 600000.00000 0.00000 coordinate pair meters North American Datum of 1983 Geodetic Reference System 80 6378137 298.257 SilverBowCreekSaturatedTailings1994 feature class FID shapefile sequence number Shape feature geometry OBJECTID Unique Identifier generated when data was archived Old_ID Old Esri coverage-id number from the 16 original data sets that were combined to form the archive data layer Grid-Code Code for depth to groundwater 0 Tailings bottom is more than 2 feet above groundwater 1 Tailings bottom is between 1 and 2 feet above groundwater 2 Tailings bottom is between 0 and 1 feet above groundwater 3 Tailings extend 0 to 1 feet below groundwater 4 Tailings extend 1 to 2 feet below groundwater 5 Tailings extend more than 2 feet below groundwater 19940330 Montana State Library mailing address

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Helena MT 59620-1800 406-444-5354 Montana Relay 711 406-444-0266 geoinfo@mt.gov Downloadable Data 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. 20141010 19960513 19960926 Montana State Library mailing address

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Helena MT 59620-1800 406-444-5354 Montana Relay 711 406-444-0266 geoinfo@mt.gov FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 {6ed93ae2-3726-46b8-adcb-d7f2e579d89e}