OFR 97-492: Thief River Falls Quadrangle NURE HSSR Study
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[See History of NURE HSSR Program for a summary of the entire program.]
ORGDP: Thief River Falls Quadrangle
A total of 342 stream-sediment and 471 ground-water samples was collected, under contract with the Oak Ridge Gaseous Diffusion Plant (ORGDP), from the Thief River Falls quadrangle. Stream sediments were collected from the Minnesota and North Dakota portions of the quadrangle by BCI Geonetics in July of 1979. Ground waters were collected by the Minnesota Geological Survey in Minnesota (August-September 1978) and by BCI Geonetics in North Dakota (July 1979). These samples were analyzed by ORGDP for uranium and other elements and the analytical data were released as the Thief River Falls Quadrangle NURE Hydrogeochemical and Stream Sediment Reconnaissance (HSSR) study GJBX-168(81) report.
Summary Tables
The following is a list of sample types collected for the Thief River Falls quadrangle study.
Sediment Sample Type | Number of Samples | Water Sample Type | Number of Samples |
---|---|---|---|
Wet Streams | 164 | Wells | 467 |
Dry Streams | 178 | Springs | 4 |
Total Sediments | 342 | Total Waters | 471 |
These Thief River Falls quadrangle samples were analyzed by one or more of the following methods:
Sediment Samples
Water Samples
The Thief River Falls quadrangle sediment and water data consist of reformatted records from the Thief River Falls Quadrangle NURE HSSR study GJBX-168(81) report. The following problems were found and addressed during the comparison and reformatting stages for these data:
Sediment Records
Water Records
The NURE HSSR data are now available online in two databases: The sediment database (also includes data for soils and some rocks) at http://tin.er.usgs.gov/nure/sediment/ and the water database at http://tin.er.usgs.gov/nure/water/. From these two web sites, NURE HSSR data can be selected, examined, summarized, and downloaded by political boundaries (State and County), by quadrangle (1:250,000-scale, 1:100,000-scale, and 1:63,360-scale for Alaska or 1:24,000-scale for the Lower 48 States), and by hydrologic unit (drainage region, subregion, river basin, or sub-basin). Selected data can be downloaded as a dBase file, a shapefile, an HTML table, or ASCII text (tab- or comma-delimited).
Thief River Falls Quadrangle Sediment Data - 342 records
Thief River Falls Quadrangle Water Data - 471 records
The water samples were reportedly collected in the field without any filtering or acidification. (See the SAMPTYP coding explanation in the On-Line Manual for USGS-Reformatted NURE HSSR Data Files for descriptions of different Sample Types). However, the samples were filtered later in the laboratory through a 0.45 micron membrane filter before analysis. Therefore, the samples were not true "untreated water" samples and the analytical data may not be directly comparable for other quadrangle water samples of the same SAMPTYP when collected by a different laboratory. Since this was the standard procedure for Oak Ridge, water data from other Oak Ridge quadrangles should be comparable.
Latitude-longitude coordinates were reported in the original data files, as decimal degrees, to only 3 decimal places. Therefore, the precision of these coordinates is limited to +/- 0.001 degrees or +/- 3.6 seconds. This translates to a minimum precision of +/- 365 feet (111 m) for latitude values and between +/- 259 feet (79 m) to +/- 235 feet (72 m) for longitude values (calculated at latitudes of 45° and 50°N, respectively.)
None found.
Back to Minnesota NURE data
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Frequently Asked Questions Concerning NURE HSSR Data
Home Page: USGS National Geochemical Database - NURE HSSR data
Page written by Steven M. Smith (smsmith@usgs.gov)
Version 1.10: July 29, 1999
Version 1.20: August 07, 2000
Version 1.30: September 11, 2001
Version 1.41: February 23, 2006
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