Water-Quality Assessment of South-Central Texas--
Descriptions and Comparisons of Nutrients, Pesticides,
and Volatile Organic Compounds at Three
Intensive Fixed Sites, 1996-98
By Patricia B. Ging
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Abstract
Introduction
Purpose
and Scope
Description
of Study Unit
Methods
of Sample Collection
Nutrients
Pesticides
Volatile Organic Compounds
Summary
References
1. Location of intensive fixed sites in the San
Antonio region of the South-Central Texas study unit.
2. Land use/land cover in the San Antonio region of the
South-Central Texas study unit.
3. Hydrographs showing discharge and sample collection
at intensive fixed sites in the San Antonio region of the South-Central Texas
study unit, April 1996-April 1998.
4. Storm hydrograph showing discharge and sample
collection with autosampler at integrator site in the San Antonio region of the
South-Central Texas study unit.
5. Range and distribution of dissolved nitrite plus
nitrate nitrogen and total phosphorus concentrations at intensive fixed sites in
the San Antonio region of the South-Central Texas study unit, April 1996-April
1998.
6. Dissolved nitrite plus nitrate nitrogen
concentrations at intensive fixed sites in the San Antonio region of the
South-Central Texas study unit, April 1996-April 1998.
7. Dissolved nitrite plus nitrate nitrogen
concentrations with respect to discharge in base-flow samples at the urban
indicator site in the San Antonio region of the South-Central Texas study unit.
8. Dissolved nitrite plus nitrate nitrogen
concentrations with respect to discharge in base-flow samples at the integrator
site in the San Antonio region of the South-Central Texas study unit.
9. Concentrations of selected pesticides in samples collected at the agriculture
indicator site in the San Antonio region of the South-Central Texas study unit,
January 1997-April 1998.
10.
Concentrations of selected pesticides in samples collected at the urban
indicator site in the San Antonio region of the South-Central Texas study unit,
January 1997-April 1998.
11.
Concentrations of selected pesticides in samples collected at the integrator
site in the San Antonio region of the South-Central Texas study unit, January
1997-April 1998.
12.
Range and distribution of selected pesticide concentrations at intensive fixed
sites in the San Antonio region of the South-Central Texas study unit, January
1997-April 1998.
1.
Number of samples collected each month at agriculture indicator
site, Medina River at LaCoste
2.
Number of samples collected each month at urban indicator site, Salado Creek
(lower station) at San Antonio
3.
Number of samples collected each month at integrator site, San Antonio River
near Elmendorf
4.
List of specific nutrients, pesticides, and volatile organic compounds analyzed
in samples collected at intensive fixed sites
5.
Concentrations of nutrients in samples collected at the agriculture indicator
site, Medina River at LaCoste
6.
Concentrations of nutrients in samples collected at the urban indicator site,
Salado Creek (lower station) at San Antonio
7.
Concentrations of nutrients in samples collected at the integrator site, San
Antonio River near Elmendorf
8.
Number of detections and range in concentration of pesticides detected in
samples collected at intensive fixed sites
9.
Number of detections and range in concentration of volatile organic compounds
detected in samples collected at intensive fixed sites
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Information on technical reports and hydrologic data related to this and other studies can be obtained from:
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District Chief
U.S. Geological Survey
8027 Exchange Dr.
Austin, TX 78754-4733
http://tx.usgs.gov/ |
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USGS Information Services
P.O. Box 25286
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Orders should specify USGS Water-Resources Investigations Report
99–4155
