FLORIDA GEOGRAPHIC DATA LIBRARY DOCUMENTATION
VERSION 2004

TITLE: SURFACE WATER NUTRIENT SAMPLING SITES

Geodataset Name:      NAWQAN
Geodataset Type:      SHAPE
Geodataset Feature:   POINT

GENERAL DESCRIPTION:

This dataset contains the sampling sites and data for the U.S. Geological 
Survey's National Water-Quality Assessment (NAWQA) Program Study-Unit 
investigations of Surface Water Nutrients for the conterminous United 
States, excluding the High Plains Regional Ground-Water Study. 
DATA SOURCE(S):                   USGS
SCALE OF ORIGINAL SOURCE MAPS:    NA
DATE OF AUTOMATION OR SOURCE:     1999
GEODATASET EXTENT:                State of Florida

FEATURE ATTRIBUTE TABLES:
Datafile Name: NAWQAN.DBF

ITEM NAME           WIDTH    TYPE        PRECISION 

SHAPE                  6     SHAPEPOINT     0   
SU                    10     CHARACTER      -                        
SITE                 254     CHARACTER      -                        
NAME                  30     CHARACTER      -                        
SAMP_TYPE             10     CHARACTER      -                        
LU_TYPE               30     CHARACTER      -                        
URBAN                  8     DECIMAL        3                        
AGRICULTUR             8     DECIMAL        3                        
RANGELAND              8     DECIMAL        3                        
FOREST                 8     DECIMAL        3                        
WATER                  8     DECIMAL        3                        
WETLANDS               8     DECIMAL        3                        
OTHER                  8     DECIMAL        3                        
LAT_DD                 8     DECIMAL        3                        
LON_DD                 8     DECIMAL        3                        
STATION               50     CHARACTER      -                        
DATEN                  8     DATE           -                        
TIMEN                  8     DECIMAL        5                        
PURPOSE               50     CHARACTER      -                        
P00060                 8     DECIMAL        5                        
P00061                 8     DECIMAL        5                        
P00010                 8     DECIMAL        5                        
P00095                 8     DECIMAL        5                        
P00300                 8     DECIMAL        5                        
P00400                 8     DECIMAL        5                        
P00915                 8     DECIMAL        5                        
P00925                 8     DECIMAL        5                        
P00930                 8     DECIMAL        5                        
P00935                 8     DECIMAL        5                        
PALK                   8     DECIMAL        5                        
P00940                 8     DECIMAL        5                        
P00945                 8     DECIMAL        5                        
R00950                10     CHARACTER      -                        
P00950                 8     DECIMAL        5                        
P00955                 8     DECIMAL        5                        
P01046                 8     DECIMAL        5                        
P01056                 8     DECIMAL        5                        
P70300                 8     DECIMAL        5                        
P00608                 8     DECIMAL        5                        
R00613                10     CHARACTER      -                        
P00613                 8     DECIMAL        5                        
R00631                10     CHARACTER      -                        
P00631                 8     DECIMAL        5                        
R00623                10     CHARACTER      -                        
P00623                 8     DECIMAL        5                        
P00625                 8     DECIMAL        5                        
R00671                10     CHARACTER      -                        
P00671                 8     DECIMAL        5                        
R00666                10     CHARACTER      -                        
P00666                 8     DECIMAL        5                        
P00665                 8     DECIMAL        5                        
DESCRIPT              30     CHARACTER      -

FEATURE ATTRIBUTE TABLES CODES AND VALUES:

ITEM                    ITEM DESCRIPTION
SHAPE                   Data attribute inherent to the ESRI shapefile format,
                        which defines the data as a point, polyline, or polygon.
                        
SU                      USGS station identification number

SITE                    USGS station identification number 

NAME                    Site Name 
 
SAMP_TYPE               Sampling Type; to identify the reason a  particular sample 
                        was collected. Can be helpful in aggregating groups of 
                        samples for analysis and interpretation.

LU_TYPE                 Land Use Type 
                        	Urban
                        	Agricultur
                        	Rangeland
                        	Forest
                        	Water
                        	Wetlands
                        	Other

URBAN                   Percent Urban Land Use                        
AGRICULTUR              Percent Agriculture Land Use                        
RANGELAND               Percent Rangeland Land Use                        
FOREST                  Percent Forest Land Use                        
WATER                   Percent Water Land Use                        
WETLANDS                Percent Wetlands Land Use                        
OTHER                   Percent Other Land Use
Lat_dd                  Latitude; in degrees, minutes, seconds 

Lon_dd                  Longitude; in degrees, minutes, seconds 
 
STATION                 USGS station identifier 

DATE                    Date of sampling event or measurement 

TIMEN                   Time of sampling event or measurement 

PURPOSE                 Purpose code for sampling collection 

P00060                  Mean daily streamflow, feet cubed per second 

P00061                  Instantaneous daily streamflow, feet cubed per second 

P00010                  Water temperature, degrees Celcius (C.) 

P00095                  Specific conductance, microsiemens (us)/cm@25
                        degrees C. 

P00300                  Dissolved oxygen, mg/L 

P00400                  pH, whole water, field standard units 

P00915                  Calcium, dissolved, mg/L as Ca 

P00925                  Magnesium, dissolved, mg/L as Mg 

P00930                  Sodium, dissolved, mg/L as Na 

P00935                  Potassium, dissolved, mg/L as K 

PALK                    Alkalinity, mg/L as CACO3 (mostly field 
                        titration of filtered water) 

P00940                  Chloride, dissolved, mg/L as Cl 

P00945                  Sulfate, dissolved, mg/L as SO4 

P00950                  Fluoride, dissolved, mg/L as F 

P00955                  Silica, dissolved, mg/L as SiO2 

P01046                  Iron, dissolved, ug/L as Fe 

P01056                  Manganese, dissolved, ug/L as Mn 

P70300                  Residue, dissolved, at 180 degrees C., mg/L 

P00608                  Ammonia, dissolved, mg/L as N 

P00613                  Nitrite, dissolved, mg/L as N 

P00631                  Nitrite and nitrate, dissolved, mg/L as N 

P00623                  Ammonia and organic nitrogen dissolved, mg/L as N 

P00625                  Ammonia and organic nitrogen, total, mg/L as N 

P00671                  Orthophosphate, dissolved, mg/L as P 

P00666                  Phosphorus, dissolved, mg/L as P 

P00665                  Phosphorus, total, mg/L as P 

DESCRIPT                FGDL added item based on Name item

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 shapefile contains basic geographic information about a subset of the 
213 surface water sites that were sampled for nutrients as part of NAWQA within 
the conterminous United States, excluding the High Plains Regional Ground 
Water-Study, which was conceived in late 1997.  This shapefile only contains the 
5 surface water sites located in the state of Florida. The dataset for the entire 
conterminous United States can be obtained from the following EPA website:
http://www.epa.gov/airmarkets/cmap/data/index.html. This shapefile also includes 
the NAWQA standard abbreviation of each Study Unit, the station identification code, 
sampling type, land-use type, percentages of specific land use types, and latitude 
and longitude coordinates.
The stream data are the results from 8459 water samples collected at 213 surface
water sites across the conterminous United States.  All of the sampling sites
are located in the 20 major watersheds that comprise the first group of NAWQA
study units.  Samples were collected from October 1991 through December 1996.
About 90 percent of the samples were collected during 1993, 1994, and 1995.  All
samples were flow-weighted and cross-sectionally integrated by standard USGS
methods (Ward and Harr, 1990).  Complete descriptions of sample collection and
processing methods are provided by Shelton (1994).
Sampling at many sites was not spaced evenly throughout the year.  Sampling at
the intensive fixed sites was more frequent during periods when pesticide levels
were expected to be elevated.  At the basic fixed sites, extra samples were
collected during extreme flow conditions.  Thus, care must be used in the
interpretation of these data.  For example, summary statistics such as the mean
or median concentration for a specific compound may be biased unless procedures
are used to account for the uneven sampling frequency.
In addition, the number of samples collected varied considerably among the
sites.  Thus, the results shown in the surface water data file are influenced
more by conditions at some sites than others.  Data analysis procedures that
account for this unequal distribution of samples among the sites must be used to
avoid biased interpretations.
This data set is used primarily to display the location of NAWQA Surface Water
Nutrient Study Sites and for use with the NAWQA Study Unit boundaries shapefile
(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.
A note concerning data scale:
The dataset provides location and attribute information for use in national and 
regional cartographic and network analysis applications.

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 NAME
-Upcased all character records
-Linked with nutrient data file
-Dropped items AREA PERIMETER NUTRIENT_S NUTRIENT_1 
 In addition the following fields had no data so they were dropped: 
 R00010 R00095 R00300 R00400 R00915 R00925 R00930 R00935 Ralk R00945 
 R00955 R01046 R01056 R70300 R00608 R00625 R00665 

DATA LINEAGE SUMMARY:

This data was originally released by USGS in 1999. In 2002, the GeoPlan 
Center downloaded this dataset in shapefile format from the EPA Downloads 
website:  http://www.epa.gov/airmarkets/cmap/data/index.html. When received, 
the shapefile was in the following projection: Albers, Datum: NAD 83, 
Spheroid: GRS80, Units: Meters.  The shapefile was then clipped to the State 
of Florida and reprojected to FGDL Albers HPGN (See "Map Projection Parameter"
below). The DESCRIPT item was added based on NAME, old internal coverage items 
were dropped (AREA PERIMETER NUTRIENT_S NUTRIENT_1), all character records 
within the attribute table were upcased, and fields with no values were removed.

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  
  False northing (meters)              0.00000

DATA SOURCES CONTACT(S):

Name:           U.S. Geological Survey			 
Abbr.name:      USGS 		
Address:        12201 Sunrise Valley Drive, MS-413			
Phone:          703-648-6854			 
Contact Person: Kerie J. Hitt 		
         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