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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

U.S. Department of the Interior, U.S. Geological Survey
Persistent URL: http://pubs.water.usgs.gov/wri974028
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Last modified: Friday, September 16 2005, 04:22:26 PM
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