OFR 97-492: Eau Claire Quadrangle NURE HSSR Study
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[See History of NURE HSSR Program for a summary of the entire program.]
ORGDP: Eau Claire Quadrangle
A total of 681 stream-sediment, 565 ground-water, and 668 surface-water samples was collected from the Eau Claire quadrangle as part of the Oak Ridge Gaseous Diffusion Plant (ORGDP) Eau Claire Quadrangle NURE Hydrogeochemical and Stream Sediment Reconnaissance (HSSR) study. The stream sediment and water sampling was conducted by ORGDP personnel between June and October of 1977. These samples were analyzed by the ORGDP for uranium and other elements. The analytical data were released as the Eau Claire Quadrangle NURE HSSR study GJBX-94(78) report.
Summary Tables
Because of the various analytical methods used, some ORGDP samples may have been analyzed once, twice, or not at all. The following table summarizes the analysis of Eau Claire quadrangle samples.
Laboratory Analysis | Sediments | Waters |
---|---|---|
ORGDP | 680 | 1,232 |
Second ORGDP Analysis | 4 | 0 |
None | 1 | 1 |
Total Samples | 681 | 1,233 |
Total Data Records | 685 | 1,233 |
The following is a listing of the sample types collected for the Eau Claire quadrangle study.
Sediment Sample Type | Number of Samples | Water Sample Type | Number of Samples |
---|---|---|---|
Wet Streams | 653 | Streams | 668 |
Dry Streams | 28 | Wells | 565 |
Total Sediments | 681 | Total Waters | 1,233 |
These Eau Claire quadrangle samples were analyzed by one or more of the following methods:
Sediment Samples
Water Samples
The Eau Claire quadrangle sediment and water data consist of reformatted records from the Eau Claire Quadrangle NURE HSSR study GJBX-94(78) 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).
Eau Claire Quadrangle Sediment Data - 684 records
Eau Claire Quadrangle Water Data - 1,232 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 +/- 364 feet (111 m) for latitude values and between +/- 280 feet (85 m) to +/- 259 feet (79 m) for longitude values (calculated at latitudes of 40° and 45°N, respectively.)
One stream-sediment sample and one stream-water sample collected in the Eau Claire quadrangle were not analyzed by any method. These same samples are also missing coordinate values.
Eau Claire Quadrangle NURE Summary
An evaluation of the Eau Claire quadrangle was conducted by Golder Associates, Inc., under subcontract to Bendix Field Engineering Corporation [PGJ/F-071(82)]. For this evaluation, 250 rock samples were analyzed for U plus 29 other elements, and 116 water samples were collected and analyzed for U using a fluorometry method. Data tables were released only on appendices on microfiche accompanying the report. The results of this investigation suggested that there were no environments in the Eau Claire quadrangle that are definitely favorable for the occurrence of uranium deposits.
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Home Page: USGS National Geochemical Database - NURE HSSR data
Page written by Bryan G. Moravec and Steven M. Smith
Contact: 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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