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Water-Quality Assessment of South-Central Texas— Occurrence and
Distribution of Volatile Organic
Compounds in Surface Water and Ground Water,
1983–94, and Implications for Future Monitoring
By Patricia B. Ging, Linda J. Judd, and Kirby H. Wynn
Contents
Abstract
Introduction
Purpose and Scope
Description of Study Unit
Methods for Data Selection
Surface Water
Ground Water
Occurrence and Distribution of Volatile Organic Compounds
Surface Water
Ground Water
Implications for Future Monitoring
Surface Water
Ground Water
Summary
References
Figures
1-6. Maps Showing:
1.
Study units of the National Water-Quality Assessment Program
2.
Study area-San Antonio region of the South-Central Texas study unit
3.
Geographic subareas of the South-Central Texas study area
4.
Locations of National Pollutant Discharge Elimination System and other U.S. Geological Survey surface water sites, South-Central Texas study area
5.
Locations of Edwards aquifer wells, South-Central Texas study area
6.
Graphs showing Detections of nine volatile organic compounds in samples
from National Pollutant Discharge Elimination System surface-water
sites, South-Central Texas study area
7.
Boxplots showing Range and distribution of volatile organic compound concentrations in samples from National Pollutant Discharge Elimination System surface-water sites grouped by land use, South-Central Texas study area
8.
Locations of Edwards aquifer wells with volatile
organic compounds (VOC) detections, South-Central Texas study area
9.
Detections of all volatile organic compounds, five volatile organic compound subgroups, and the five most commonly detected volatile organic compounds in samples from Edwards aquifer wells, South-Central Texas study
area
10.
Range and distribution of concentrations of the five
most commonly detected volatile organic compounds in samples from Edwards
aquifer wells, South-Central Texas study area
11.
Locations of selected basic fixed surface-water sampling sites, South-Central Texas study area
Tables
1.
Description of National Pollutant Discharge Elimination
System surface-water sites, South-Central Texas study area
2.
Volatile organic compounds
analyzed for in surface-water and ground-water samples collected in 3. South-Central Texas study area
4.
Number of sites, total number of samples, and number of
samples with compounds above detection limit per volatile organic compound for
National Pollutant Discharge Elimination System surface-water sites,
South-Central Texas study area
5.
Detections of volatile organic compounds in samples from
National Pollutant Discharge Elimination System surface-water sites,
South-Central Texas study area
6.
Concentrations of volatile
organic compounds detected in samples from National Pollutant Discharge
Elimination System surface-water sites in commercial land-use areas,
South-Central Texas study area
7.
Concentrations of volatile
organic compounds detected in samples from National Pollutant Discharge
Elimination System surface-water sites in residential land-use areas,
South-Central Texas study area
8.
Concentrations of volatile organic compounds detected in samples from National Pollutant
Discharge Elimination System surface-water sites in light industrial land-use areas,
South-Central Texas study area
9.
Number of sites, total number of samples, and number of
samples with compounds above detection limit per volatile organic compound for
other U.S. Geological Survey surface-water sites, South-Central Texas study area
10.
Number of detections and range in concentration of volatile
organic compounds detected in samples from Edwards aquifer wells, South-Central
Texas study area
Information on technical reports and hydrologic data related to this and other studies can be obtained from:
|
District Chief
U.S. Geological Survey
8027 Exchange Dr.
Austin, TX 78754-4733
http://tx.usgs.gov/ |
The full report is available in printed form from:
USGS Information Services
P.O. Box 25286
Denver, CO 80225
Or fax a request to (303) 202-4693
Or call 1-888-ASK-USGS
Orders should specify USGS Water-Resources Investigations Report 97–4028