OFR 97-492: Wilmington Quadrangle NURE HSSR Study
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[See History of NURE HSSR Program for a summary of the entire program.]
Delaware
Subcontractors for the Savannah River Laboratory (SRL) collected at least 234 stream-sediment and 284 ground-water samples within 3 counties from Delaware as part of the NURE Hydrogeochemical and Stream Sediment Reconnaissance (HSSR) program. The sediment samples were collected during May - June 1978, and water samples were collected during July 1977, August 1978, and October 1978. Sample coverage included portions of the Salisbury and Wilmington 1:250,000-scale quadrangles. (A total of 111 stream-sediment and 92 ground-water samples were collected within the Wilmington quadrangle.) These samples were sent to SRL for analysis of uranium and additional elements (16 in sediments and 9 in waters). SRL was able to analyze 226 sediments and 284 waters from Delaware; this includes 106 sediment and 92 water samples from the Wilmington quadrangle. The analytical and site location data for all Delaware samples were released in the Delaware, Maryland, Virginia, and West Virginia Data Report [GJBX-103(82)].
New Jersey
Subcontractors for the Savannah River Laboratory (SRL) collected at least 748 stream-sediment, 378 surface-water, and 1,038 ground-water samples within 21 counties from New Jersey as part of the NURE Hydrogeochemical and Stream Sediment Reconnaissance (HSSR) program. The sediment samples were collected during August - November 1977 and June 1978, and water samples were collected during July - October 1977 and January - February 1978. Sample coverage included portions of the New York, Newark, Salisbury, Scranton, and Wilmington 1:250,000-scale quadrangles. (A total of 393 stream-sediment and 290 ground-water samples were collected within the Wilmington quadrangle.) These samples were sent to SRL for analysis of uranium and additional elements (16 in sediments and 9 in waters). SRL was able to analyze 728 sediments and 1,414 waters from New Jersey; this includes 346 sediment and 290 water samples from the Wilmington quadrangle. The analytical and site location data for all New Jersey samples were released in the Pennsylvania, New Jersey, and New York Data Report [GJBX-106(82)].
SRL sent 550 sediment samples from New Jersey to an unnamed contract laboratory for "Supplemental Analyses." Supplemental analytical determinations for up to 23 elements were reported for 542 of these samples in the Pennsylvania, New Jersey, and New York Data Report [GJBX-106(82)]. The digital data file accompanying this report includes Supplemental Analysis records for 172 New Jersey sediment samples within the Wilmington quadrangle, but only 170 records contained analytical data.
Pennsylvania
Subcontractors for the Savannah River Laboratory (SRL) collected at least 4,499 stream-sediment, 4,401 surface-water, and 5,734 ground-water samples within 49 counties from Pennsylvania as part of the NURE Hydrogeochemical and Stream Sediment Reconnaissance (HSSR) program. The sediment samples were collected during September - October 1976; July - December 1977; and July - August 1978, and water samples were collected during May - December 1977 and July - August 1978. Sample coverage included portions of the Baltimore, Canton, Clarksburg, Cleveland, Cumberland, Elmira, Harrisburg, Newark, Pittsburgh, Scranton, Warren, Williamsport, and Wilmington 1:250,000-scale quadrangles. (A total of 11 stream-sediment, 11 surface-water, and 90 ground-water samples were collected within the Wilmington quadrangle.) These samples were sent to SRL for analysis of uranium and additional elements (16 in sediments and 9 in waters). SRL was able to analyze 4,287 sediments and 10,100 waters from Pennsylvania; this includes 11 sediment and 92 water samples from the Wilmington quadrangle. The analytical and site location data for all Pennsylvania samples were released in the Pennsylvania, New Jersey, and New York Data Report [GJBX-106(82)].
SRL sent 3,851 sediment samples from Pennsylvania to an unnamed contract laboratory for "Supplemental Analyses." Supplemental analytical determinations for up to 23 elements were reported for 3,842 of these samples in the Pennsylvania, New Jersey, and New York Data Report [GJBX-106(82)]. The digital data file accompanying this report include Supplemental Analyses for 11 Pennsylvania sediment samples within the Wilmington quadrangle.
Maryland
Subcontractors for the Savannah River Laboratory (SRL) collected at least 1,322 stream-sediment, 837 surface-water, and 1,188 ground-water samples within 23 counties from Maryland as part of the NURE Hydrogeochemical and Stream Sediment Reconnaissance (HSSR) program. The sediment samples were collected during May - August 1978, and water samples were collected during May - June 1977; December 1977; and July - October 1978. Sample coverage included portions of the Baltimore, Chincoteague, Cumberland, Salisbury, Washington, and Wilmington 1:250,000-scale quadrangles. (A total of 86 stream-sediment, 34 surface-water, and 65 ground-water samples were collected within the Wilmington quadrangle.) These samples were sent to SRL for analysis of uranium and additional elements (16 in sediments and 9 in waters). SRL was able to analyze 1,286 sediments and 2,023 waters from Maryland; this includes 85 sediment and 98 water samples from the Wilmington quadrangle. The analytical and site location data for all Maryland samples were released in the Delaware, Maryland, Virginia, and West Virginia Data Report [GJBX-103(82)].
SRL: Wilmington Quadrangle
SRL did not release a separate report for the Wilmington quadrangle.
ORGDP: Salisbury and Wilmington Quadrangles
SRL sent several New Jersey sediment samples to the Oak Ridge Gaseous Diffusion Plant (ORGDP) for analysis of uranium and 31 additional elements. ORGDP released the analytical data for 28 samples in the Salisbury and Wilmington Quadrangles GJBX-81(82) Data Report (A total of 27 samples were from the Wilmington quadrangle). The site coding information for this data set was summarized in the GJBX-51(82) report.
Gold Analyses
Data for gold analyses of sediments by SRL neutron activation were released in the GJBX-135(82) summary report. The introduction of that report states:
"This report contains previously unreported neutron-activation analyses of gold in sediment samples determined at SRL. These data were not included in the standard SRL NURE data reports because the gold spectrum was not measured in the original analytical procedure and the report format was designed without the gold analyses being included. Gold analyses became available as the analytical procedure was refined, but the report format was not modified to incorporate these data."
Only those sediment samples that had detectable concentrations of gold by neutron activation analysis were given in the GJBX-135(82) report. Sediment samples with concentrations below detection limits were not reported and can only be ascertained by identifying which samples were actually analyzed by neutron activation at SRL.
Summary Tables
Because of the various laboratories and analytical methods used, some SRL samples may have been analyzed once, twice, or not at all. The following table summarizes the analysis of Wilmington quadrangle samples.
Laboratory Analysis | Sediments | Waters |
---|---|---|
Only SRL | 368 | 572 |
Both SRL and SRL Supplemental Labs | 180 | 0 |
Only SRL Supplemental Lab | 1 | 0 |
Only ORGDP Lab | 27 | 0 |
None | 25 | 10 |
Total Samples | 601 | 582 |
Total Data Records | 601 | 582 |
The following is a list of all sample types collected and reported for NURE studies in the Wilmington quadrangle.
Sediment Sample Type | Number of Samples | Water Sample Type | Number of Samples |
---|---|---|---|
Wet Streams | 601 | Streams | 45 |
Wells | 530 | ||
Springs | 7 | ||
Total Sediments | 601 | Total Waters | 582 |
These Wilmington quadrangle samples were analyzed by one or more of the following methods:
Sediment Samples
Water Samples
Sediment Records
The Wilmington quadrangle sediment data consist of reformatted records from the Delaware and Maryland portions of the Delaware, Maryland, Virginia, and West Virginia Data Report [GJBX-103(82)], and reformatted records from the New Jersey and Pennsylvania portions of the Pennsylvania, New Jersey, and New York Data Report [GJBX-106(82)]. These records were compared and combined with records from the ORGDP Salisbury and Wilmington Quadrangles GJBX-81(82) Data Report. Site descriptive information and coordinates were compared for all corresponding records. Sources of data and any problems found are described in the REFORMAT comment field. The following problems were addressed and corrected during the reformatting process of the Wilmington quadrangle sediment data:
Water Records
The Wilmington quadrangle water data consist of reformatted records from the Delaware and Maryland portions of the Delaware, Maryland, Virginia, and West Virginia Data Report [GJBX-103(82)], and reformatted records from the New Jersey and Pennsylvania portions of the Pennsylvania, New Jersey, and New York Data Report [GJBX-106(82)]. The following problems were addressed and corrected during the reformatting process of the Wilmington quadrangle water data:
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).
Wilmington Quadrangle Sediment Data - 600 records
Wilmington Quadrangle Water Data - 582 records
In the eastern United States, SRL collected samples primarily by county. Often, not all counties within a quadrangle were completely sampled. Sample coverage in the Wilmington quadrangle is complete and includes samples from Kent and New Castle Counties in Delaware; Cecil, Caroline, Kent, and Queen Annes Counties in Maryland; Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester, Ocean, and Salem Counties in New Jersey; and Chester, Delaware, and Lancaster Counties in Pennsylvania. The laboratory and analytical methods used also may vary by county such that adjacent counties often have very different analytical coverage.
Twenty-five stream-sediment samples and ten water samples within the Wilmington quadrangle were not analyzed by any of the various laboratories. The following table summarizes the locations of those unanalyzed samples.
State | County | Sample Media | Unanalyzed Samples | Total Samples |
---|---|---|---|---|
Delaware | Kent | Sediment | 1 | 52 |
Delaware | New Castle | Sediment | 4 | 60 |
Maryland | Cecil | Sediment | 1 | 37 |
Maryland | Kent | Water | 1 | 11 |
New Jersey | Atlantic | Sediment | 6 | 89 |
New Jersey | Cape May | Sediment | 2 | 40 |
New Jersey | Gloucester | Sediment | 11 | 92 |
Pennsylvania | Chester | Water | 9 | 73 |
None found.
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Frequently Asked Questions Concerning NURE Data
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 1.41: February 23, 2006
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