FLORIDA GEOGRAPHIC DATA LIBRARY DOCUMENTATION
VERSION 2004
TITLE: NAWQA TRACE ELEMENTS SAMPLING SITES AND DATA
Geodataset Name: NAWQA Geodataset Type: SHAPE Geodataset Feature: POINT
GENERAL DESCRIPTION:
This dataset contains the sampling sites and data for the U.S. Geological Survey National Water-Quality Assessment (NAWQA) Program Study-Unit investigations of Trace Elements for the conterminous United States, excluding the High Plains Regional Ground-Water Study. DATA SOURCE(S): U.S. Geological Survey SCALE OF ORIGINAL SOURCE MAPS: 1:2,000,000 DATE OF AUTOMATION OR SOURCE: 2002 GEODATASET EXTENT: State of Florida
Datafile Name: NAWQA.DBF ITEM NAME WIDTH TYPE PRECISION SHAPE 6 POINT 0 TRACE_ELEM 8 DECIMAL 0 TRACE_EL_1 8 DECIMAL 0 SUID 10 CHARACTER - STAID 30 CHARACTER - LAT 8 DECIMAL 3 LON 8 DECIMAL 3 DATET 8 DATE - TIMET 8 DECIMAL 5 ALPCT 8 DECIMAL 5 FEPCT 8 DECIMAL 5 TIPCT 8 DECIMAL 5 ORGPCT 8 DECIMAL 5 ASCONC 8 DECIMAL 5 CDCONC 8 DECIMAL 5 CRCONC 8 DECIMAL 5 CUCONC 8 DECIMAL 5 PBCONC 8 DECIMAL 5 HGCONC 8 DECIMAL 5 NICONC 8 DECIMAL 5 SECONC 8 DECIMAL 5 ZNCONC 8 DECIMAL 5 NOT_CODED 8 DECIMAL 5 NEWRS_URB 8 DECIMAL 5 RESID_URB 8 DECIMAL 5 COMME_URB 8 DECIMAL 5 INDUS_URB 8 DECIMAL 5 TRANS_URB 8 DECIMAL 5 INDCM_URB 8 DECIMAL 5 MIXED_URB 8 DECIMAL 5 OTHER_URB 8 DECIMAL 5 CROP_PAST 8 DECIMAL 5 ORCH_VINE 8 DECIMAL 5 CONF_FEED 8 DECIMAL 5 OTHER_AGR 8 DECIMAL 5 HERB_RNGE 8 DECIMAL 5 SHRB_RNGE 8 DECIMAL 5 MIXD_RNGE 8 DECIMAL 5 DECID_FOR 8 DECIMAL 5 EVERG_FOR 8 DECIMAL 5 MIXED_FOR 8 DECIMAL 5 STR_CANAL 8 DECIMAL 5 LAKES 8 DECIMAL 5 RESERV 8 DECIMAL 5 FOR_WTLD 8 DECIMAL 5 NFOR_WTLD 8 DECIMAL 5 BEACHES 8 DECIMAL 5 SANDY_AR 8 DECIMAL 5 EXP_ROCK 8 DECIMAL 5 STP_MINE 8 DECIMAL 5 TRANS_AR 8 DECIMAL 5 MIXED_BAR 8 DECIMAL 5 BARE_GRND 8 DECIMAL 5 PHYS_DIV 50 CHARACTER - PHYS_PROV 50 CHARACTER - PHYS_SEC 50 CHARACTER - PHYS_PCT 8 DECIMAL 5 POP90 8 DECIMAL 5 BASN_SQMI 8 DECIMAL 5 BASN_SQKM 8 DECIMAL 5 PDENS_SQMI 8 DECIMAL 5 PDENS_SQKM 8 DECIMAL 5 ROCKDESC 50 CHARACTER - ROCKTYPE 50 CHARACTER - GEOL_TIME 50 CHARACTER - GEO_PCT 8 DECIMAL 5 COMMENT 50 CHARACTER - DESCRIPT 55 CHARACTER -
FEATURE ATTRIBUTE TABLES CODES AND VALUES:
ITEM NAME ITEM DESCRIPTION SHAPE Data attribute inherent to the ESRI shapefile format, which defines the data as a point, polyline, or polygon. TRACE_ELEM Internal feature number TRACE_EL_1 User-assigned feature number SUID USGS station identification number STAID USGS station identification number LAT Latitude coordinate, in decimal degrees LON Longitude coordinate, in decimal degrees DATET Date of sample collection, in year.month.day TIMET Time of sample collection , in military time ALPCT Percent of aluminum in sample FEPCT Percent of iron in sample TIPCT Percent of titanium in sample ORGPCT Percent of organic carbon in sample ASCONC Concentration of arsenic in sample, in micrograms per gram (parts-per-million) ; "<" means "less than indicated value". CDCONC Concentration of cadium in sample, in micrograms per gram (parts-per-million) ; "<" means "less than indicated value". CRCONC Concentration of chromium in sample, in micrograms per gram (parts-per-million) ; "<" means "less than indicated value". CUCONC Concentration of copper in sample, in micrograms per gram (parts-per-million) ; "<" means "less than indicated value". PBCONC Concentration of lead in sample, in micrograms per gram (parts-per-million) ; "<" means "less than indicated value". HGCONC Concentration of mercury in sample, in micrograms per gram (parts-per-million) ; "<" means "less than indicated value". NICONC Concentration of nickel in sample, in micrograms per gram (parts-per-million) ; "<" means "less than indicated value". SECONC Concentration of selenium in sample, in micrograms per gram (parts-per-million) ; "<" means "less than indicated value". ZNCONC Concentration of zinc in sample, in micrograms per gram (parts-per-million) ; "<" means "less than indicated value". NOT_CODED Percent of land use with missing code NEWRS_URB Percent of NEW residential development RESID_URB Percent of urban land use, residential COMME_URB Percent of urban land use, commercial and services INDUS_URB Percent of urban land use, industrial TRANS_URB Percent of urban land use, transportation, communications and services INDCM_URB Percent of urban land use, industrial and commercial complexes MIXED_URB Percent of urban land use, mixed OTHER_URB Percent of urban land use, other CROP_PAST Percent of cropland and pasture ORCH_VINE Percent of orchards, groves, vineyards, nurseries and ornamental horticultural areas CONF_FEED Percent of confined feeding operations OTHER_AGR Percent of other agricultural land HERB_RNGE Percent of herbaceous rangeland SHRB_RNGE Percent of shrub-brushland rangeland MIXD_RNGE Percent of mixed rangeland DECID_FOR Percent of deciduous forest land EVERG_FOR Percent of evergreen forest land MIXED_FOR Percent of mixed forest land STR_CANAL Percent of streams and canals LAKES Percent of lakes RESERV Percent of reservoirs FOR_WTLD Percent of forested wetland NFOR_WTLD Percent of nonforested wetland BEACHES Percent of beaches SANDY_AR Percent of sandy areas other than beaches EXP_ROCK Percent of bare exposed rock STP_MINE Percent of strip mines, quarries, and gravel pits TRANS_AR Percent of transitional areas MIXED_BAR Percent of mixed barren land BARE_GRND Percent of bare ground PHYS_DIV UNKNOWN PHYS_PROV Name of major physioigraphic division in basin PHYS_SEC Name of major physioigraphic province in basin PHYS_PCT Name of major physioigraphic region in basin POP90 Estimated 1990 population for basin BASN_SQMI Area of basin, in square miles (portion in US only) BASN_SQKM Area of basin, in square kilometers (portion in US only) PDENS_SQMI Estimated population density (people per square mile) PDENS_SQKM Estimated population density (people per square kilometer) ROCKDESC Brief description of the rock unit ROCKTYPE Type of rock GEOL_TIME Geological time period GEO_PCT Percent of most prominent geology found in basin COMMENT Comments DESCRIPT FGDL added item based on SUID
USER NOTES:
The National Water-Quality Assessment Program is designed to describe the status and trends in the quality of the Nation's ground- and surface-water resources and to provide a sound understanding of the natural and human factors that affect the quality of these resources (Leahy and others, 1990). A "Study Unit" is a major hydrologic system in which NAWQA studies are focused. Study Units are geographically defined by a combination of ground- and surface-water features (Gilliom and others, 1995). As part of the NAWQA program, Study-Unit investigations were planned for 60 areas throughout the Nation to provide a framework for national and regional water-quality assessments (Leahy and others, 1990). The 60 planned Study-Units were divided into three groups of 20. Each group would be intensively studied on a rotational basis with 20 studies beginning in fiscal year 1991 (FY 1991 runs from October 1990-September 1991), 20 more studies beginning in fiscal year 1994 (October 1993-September 1994), and the final 20 studies beginning in fiscal year 1997 (October 1996-September 1997). Each study cycle would span 10 years. In 1996, the number of Study-Units was scaled back to 59 when two of the original 60 Study Units combined. Also, because of budgetary restraints, some of the original planned Study Units have been scheduled to start later than originally planned and others have not even been scheduled to start yet. This coverage contains basic geographic information about the 541 trace element sites that were sampled as part of NAWQA within the conterminous United States, excluding the High Plains Regional Ground Water-Study, which was conceived in late 1997. The coverage also includes the NAWQA standard abbreviation of each Study Unit, the station identification code, and latitude and longitude coordinates. This data set is used primarily to display the location of NAWQA Trace Element Study Sites and for use with the NAWQA Study Unit boundaries coverage (NAWQA) for analysis of data at the national scale. It is not recommended for either local or regional analysis due to the small scale of most of the features. Supplemental_Information: Trace elements are inorganic chemicals usually occurring in small amounts, whose concentrations in water, sediments, and biota may be of concern. Trace elements were cited as one of the highest-priority issues for the National Water-Quality Assessment (NAWQA) program, in a questionnaire of water managers and scientists across the United States. Natural mineral deposits are generally the original source of these trace elements, but their distribution and release may be greatly altered by a variety of human actions. NAWQA's goal is to understand how human and natural influences affect the concentration and movement of two groups of trace elements, including 31 metals and radionuclides. Trace-element concentrations in 541 streambed-sediment samples collected from 20 study areas across the conterminous United States were examined as part of the National Water-Quality Assessment Program of the U.S. Geological Survey. Sediment samples were sieved and the <63-īm fraction was retained for determination of total concentrations of trace elements. Aluminum, iron, titanium, and organic carbon were weakly or not at all correlated with the nine trace elements examined: arsenic, cadmium, chromium, copper, lead, mercury, nickel, selenium, and zinc. Four different methods of accounting for background/baseline concentrations were examined; however, normalization was not required because field sieving removed most of the background differences between samples. The sum of concentrations of trace elements characteristic of urban settings--copper, mercury, lead, and zinc--was well correlated with population density, nationwide. Median concentrations of seven trace elements (all nine examined except arsenic and selenium) were enriched in samples collected from urban settings relative to agricultural or forested settings. Forty-nine percent of the sites sampled in urban settings had concentrations of one or more trace elements that exceeded levels at which adverse biological effects could occur in aquatic biota. A note concerning data scale: Scale is an important factor in data usage. Certain scale datasets are not suitable for some project, analysis, or modelling purposes. Please be sure you are using the best available data. 1:24000 scale datasets are recommended for projects that are at the county level. 1:24000 data should NOT be used for high accuracy base mapping such as property parcel boundaries. 1:100000 scale datasets are recommended for projects that are at the multi-county or regional level. 1:250000 scale datasets are recommended for projects that are at the regional or state level or larger. Vector datasets with no defined scale or accuracy should be considered suspect. Make sure you are familiar with your data before using it for projects or analyses. Every effort has been made to supply the user with data documentation. For additional information, see the References section and the Data Source Contact section of this documentation. For more information regarding scale and accuracy, see our web pages at: http://www.geoplan.ufl.edu/education.html
FGDL QUALITY ASSURANCE STATUS:
-Projected data to FGDL Albers HPGN (See "Map Projection Parameters" below). -Clipped to the State of Florida -DESCRIPT item added based on SUID (used values for SUID based on metadata) -Upcased all character records -Linked NAWQA_TE.dbf to NAWQA.shp based on STFAID -Deleted the following items that are non-applicable for Florida region. (All records contained zero values). DRY_SALT Percent of dry salt flats SHB_TUND Percent of shrub and brush tundra HERB_TUND Percent of herbaceous tundra WET_TUND Percent of wet tundra MIXD_TUND Percent of mixed tundra SNOWFLDS Percent of perennial snowfields GLACIERS Percent of glaciers
REFERENCES:
U.S. Geological Survey National Water-Quality Assessment (NAWQA) Study http://co.water.usgs.gov/trace/
DATA LINEAGE SUMMARY:
Data originally released by USGS in 2002. Data was downloaded by the GeoPlan Center as an interchange file (.e00) from: http://www.epa.gov/airmarkets/cmap/data/category3.html When received, data was in the following projection: Albers, Datum: NAD 83, Spheroid: GRS80, Units: Meters. The coverage was converted to shapefile and then clipped to the State of Florida, and projected to FGDL Albers HPGN.
MAP PROJECTION PARAMETERS:
Projection ALBERS Units METERS Datum HPGN Spheroid GRS1980 1st standard parallel 24 0 0.000 2nd standard parallel 31 30 0.000 Central meridian -84 0 0.000 Latitude of projection's origin 24 0 0.000 False easting (meters) 400000.00000 Calse northing (meters) 0.00000
DATA SOURCES CONTACT(S):
Name: U.S. Geological Survey Abbr.name: USGS Address: 12201 Sunrise Valley Drive, MS-413 Reston, VA 20192 Contact Person: Kerie J. Hitt Phone: 703-648-6854 Email: kjhitt@usgs.gov
FGDL CONTACT:
Name: Florida Geographic Data Library Abbr. Name: FGDL Address: Florida Geographic Data Library 431 Architecture PO Box 115706 Gainesville, FL 32611-5706 Web site: http://www.fgdl.org Contact FGDL: Technical Support: http://www.fgdl.org/fgdlfeed.html FGDL Frequently Asked Questions: http://www.fgdl.org/fgdlfaq.html FGDL Mailing Lists: http://www.fgdl.org/fgdl-l.html For FGDL Software: http://www.fgdl.org/software.html