OFR 97-492: Carlsbad Quadrangle NURE HSSR Study
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[See History of NURE HSSR Program for a summary of the entire program.]
LASL: Carlsbad Quadrangle
Sediment and water samples were collected within the Carlsbad 2° quadrangle as part of the Los Alamos Scientific Laboratory (LASL) Carlsbad Quadrangle NURE Hydrogeochemical and Stream Sediment Reconnaissance (HSSR) study. Within the quadrangle, sampling of the area east of 105°W longitude was conducted between October and December of 1976 and sampling in the area west of 105°W longitude was conducted in June and July of 1977 and in April of 1978. LASL analyzed all of the 1976 and 1977 field season samples (but not the 1978 season samples) for uranium. LASL did not release the geochemical data in a separate NURE HSSR report.
ORGDP: Carlsbad Quadrangle
LASL sent 1,680 sediment and 467 water samples from the Carlsbad quadrangle to the Oak Ridge Gaseous Diffusion Plant (ORGDP) for multielement analyses. These data plus the accompanying LASL uranium data were released by ORGDP as the Carlsbad Quadrangle NURE HSSR study GJBX-415(81) report.
Summary Tables
The following is a list of the NURE sample types reported for the Carlsbad quadrangle study.
Sediment Sample Type | Number of Samples | Water Sample Type | Number of Samples |
---|---|---|---|
Wet Streams | 28 | Streams | 29 |
Dry Streams | 1,370 | Wells | 352 |
Wet Springs | 48 | Springs | 70 |
Dry Springs | 7 | Natural Ponds | 9 |
Wet Natural Ponds | 11 | Artificial Ponds | 7 |
Dry Natural Ponds | 110 | ||
Wet Artificial Ponds | 8 | ||
Dry Artificial Ponds | 98 | ||
Total Sediments | 1,680 | Total Waters | 467 |
These Carlsbad quadrangle samples were analyzed by one or more of the following methods:
Sediment Samples
Water Samples
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 websites, 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).
Carlsbad Quadrangle Sediment Data - 1,680 records
Carlsbad Quadrangle Water Data - 467 records
For most LASL NURE HSSR quadrangle studies, all of the water samples were initially analyzed for uranium by fluorometry. Water samples with greater than some upper limit (commonly 10 ppb uranium) were then reanalyzed by delayed-neutron counting. When ORGDP reported the LASL analytical data for uranium in water samples, the information which distinguished LASL fluorometric from LASL delayed neutron uranium methods was not preserved. All of the LASL uranium values in the USGS-Reformatted NURE water file for Carlsbad are therefore identified as fluorometric uranium even though there is a strong possibility that many of the higher values were determined by delayed-neutron counting.
ORGDP only analyzed one water and two sediment samples for uranium. Therefore almost all of the 1978 season samples do not have any uranium data.
LASL: Carlsbad Quadrangle
Often LASL sent most but not all of the original samples to ORGDP for multielement analyses. (See the adjacent Tularosa quadrangle for an example.) Since LASL did not release a separate NURE HSSR report after the initial collection and uranium analysis of Carlsbad quadrangle samples we were unable to determine if the number of samples sent to ORGDP represented the entire collection or a subset. Therefore we could not eliminate the possibility of additional Carlsbad samples which may have been analyzed for uranium at LASL but not for multiple elements at ORGDP.
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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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