0

Front cover: Domestic-supply well sampled in Tangipahoa Parish, Louisiana

(Photograph by Lane B. Simmons, U.S. Geological Survey)
i

QUALITY OF WATER IN DOMESTIC WELLS IN THE 

CHICOT AND CHICOT EQUIVALENT AQUIFER 

SYSTEMS, SOUTHERN LOUISIANA AND 

SOUTHWESTERN MISSISSIPPI, 2000-2001

By Roland W. Tollett, Robert B. Fendick, Jr., and Lane B. Simmons

 

U.S. GEOLOGICAL SURVEY

Water-Resources Investigations Report 03-4122

NATIONAL WATER-QUALITY ASSESSMENT PROGRAM

Baton Rouge, Louisiana

2003
ii

U.S. DEPARTMENT OF THE INTERIOR

GALE A. NORTON, Secretary

U.S. GEOLOGICAL SURVEY

Charles G. Groat, Director

Any use of trade, product, or firm names in this report is for descriptive purposes only and does not imply endorsement by the 

U.S. Government.

Copies of this report can be purchased 

from:

U.S. Geological Survey

Branch of Information Services

Box 25286

Denver, CO 80225

E-mail: infoservices@usgs.gov

Fax: (303) 202-4693

Telephone (toll free): 1-888-ASK-USGS

For additional information contact:

District Chief

U.S. Geological Survey

3535 S. Sherwood Forest Blvd., Suite 120

Baton Rouge, LA 70816

E-mail: dc_la@usgs.gov

Fax: (225) 298-5490

Telephone: (225) 298-5481

Home Page: http://la.water.usgs.gov

Information regarding the National Water-Quality Assessment (NAWQA) Program is available on 

the Internet via the World Wide Web. You may connect to the NAWQA Home Page using the Universal Resource Locator (URL) at:

http://water.usgs.gov/nawqa
iii

FOREWORD

The U.S. Geological Survey (USGS) is committed to serve the Nation with accurate and timely scientific information that helps enhance and protect the overall quality of life, and facilitates effective management of water, biological, energy, and mineral resources. Information on the quality of the Nation’s water 

resources is of critical interest to the USGS because it is so integrally linked to the long-term availability of 

water that is clean and safe for drinking and recreation and that is suitable for industry, irrigation, and habitat 

for fish and wildlife. Escalating population growth and increasing demands for the multiple water uses make 

water availability, now measured in terms of quantity and quality, even more critical to the long-term sustainability of our communities and ecosystems.

The USGS implemented the National Water-Quality Assessment (NAWQA) Program to support

national, regional, and local information needs and decisions related to water-quality management and policy. Shaped by and coordinated with ongoing efforts of other Federal, State, and local agencies, the NAWQA

Program is designed to answer: What is the condition of our Nation’s streams and ground water? How are the

conditions changing over time? How do natural features and human activities affect the quality of streams and

ground water, and where are those effects most pronounced? By combining information on water chemistry,

physical characteristics, stream habitat, and aquatic life, the NAWQA Program aims to provide science-based

insights for current and emerging water issues. NAWQA results can contribute to informed decisions that

result in practical and effective water-resource management and strategies that protect and restore water quality.

Since 1991, the NAWQA Program has implemented interdisciplinary assessments in more than 50 of

the Nation’s most important river basins and aquifers, referred to as Study Units. Collectively, these Study

Units account for more than 60 percent of the overall water use and population served by public water supply,

and are representative of the Nation’s major hydrologic landscapes, priority ecological resources, and agricultural, urban, and natural sources of contamination. 

Each assessment is guided by a nationally consistent study design and methods of sampling and analysis. The assessments thereby build local knowledge about water-quality issues and trends in a particular 

stream or aquifer while providing an understanding of how and why water quality varies regionally and 

nationally. The consistent, multi-scale approach helps to determine if certain types of water-quality issues are 

isolated or pervasive, and allows direct comparisons of how human activities and natural processes affect 

water quality and ecological health in the Nation’s diverse geographic and environmental settings. Comprehensive assessments on pesticides, nutrients, volatile organic compounds, trace metals, and aquatic ecology 

are developed at the national scale through comparative analysis of the Study-Unit findings. 

The USGS places high value on the communication and dissemination of credible, timely, and relevant science so that the most recent and available knowledge about water resources can be applied in management and policy decisions. We hope this NAWQA publication will provide you the needed insights and 

information to meet your needs, and thereby foster increased awareness and involvement in the protection 

and restoration of our Nation’s waters. 

The NAWQA Program recognizes that a national assessment by a single program cannot address all 

water-resource issues of interest. External coordination at all levels is critical for a fully integrated understanding of watersheds and for cost-effective management, regulation, and conservation of our Nation’s 

water resources. The Program, therefore, depends extensively on the advice, cooperation, and information 

from other Federal, State, interstate, Tribal, and local agencies, non-government organizations, industry, academia, and other stakeholder groups. The assistance and suggestions of all are greatly appreciated.

Robert M. Hirsch

Associate Director for Water
iv
v

CONTENTS

Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii

Abstract . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Purpose and Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Description of Study Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Climate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Hydrogeologic Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Land Use, Water Use, and Population . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Well Site Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Well Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Sample Collection and Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Quality-Control Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Statistical Techniques. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Quality of Water in Domestic Wells . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Physicochemical Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Dissolved Solids and Major Inorganic Ions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Trace Elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Radon, Chlorofluorocarbons, and Stable Isotopes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Nutrients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Dissolved Organic Carbon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Pesticides and Degradation Products. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Volatile Organic Compounds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Statistical Analysis of Ground-Water-Quality Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Correlation Between Depth to Top of Screen and Selected Physicochemical Properties and Chemical 

Constituents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Comparison Between Depth to Top of Screen and Selected Physicochemical Properties and Chemical 

Constituents in the Chicot Aquifer System and the Chicot Equivalent Aquifer System. . . . . . . . . . . . . 22

Summary and Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Selected References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Appendixes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

1. Physicochemical properties of water from selected domestic wells in southern Louisiana and 

southwestern Mississippi, 2000-2001 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

2. Dissolved-solids and major inorganic ion concentrations in water from selected domestic wells in

southern Louisiana and southwestern Mississippi, 2000-2001 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

3. Trace-element concentrations in water from selected domestic wells in southern Louisiana and 

southwestern Mississippi, 2000-2001 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

4. Radon, chlorofluorocarbons, and stable isotope concentrations in water from selected domestic wells 

in southern Louisiana and southwestern Mississippi, 2000-2001. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

5. Nutrients and dissolved organic carbon concentrations in water from selected domestic wells in 

southern Louisiana and southwestern Mississippi, 2000-2001 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

6. Pesticide concentrations in water from selected domestic wells in southern Louisiana and 

southwestern Mississippi, 2000-2001 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

7. Concentrations of pesticide degradation products in water from selected domestic wells in

southern Louisiana and southwestern Mississippi, 2000-2001 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

8. Volatile organic compounds in water from selected domestic wells in southern Louisiana and 

southwestern Mississippi, 2000-2001 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68 
vi

FIGURES

 1. Map showing study area and location of selected domestic wells in southern Louisiana and

southwestern Mississippi, 2000-2001 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2. Diagram showing selected hydrogeologic units in southern Louisiana and

southwestern Mississippi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

3. Map showing Chicot aquifer system, Southern Hills regional aquifer system, and 

selected domestic well locations in southern Louisiana and southwestern Mississippi . . . . . . . . . . . . . . . . 7

4. Map showing major land-use types and selected domestic well locations in 

southern Louisiana and southwestern Mississippi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

5. Graph showing pesticides and degradation products detected in water from selected 

domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001. . . . . . . . . . . . . . . . . . . . . 18

6. Map showing number of pesticides and degradation products and volatile organic

compounds detected in water from selected wells in southern Louisiana and

southwestern Mississippi, 2000-2001 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

7. Graph showing volatile organic compounds detected in water from selected domestic

wells in southern Louisiana and southwestern Mississippi, 2000-2001 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

8. Boxplots showing comparison of depth to top of screen and selected physicochemical 

properties and chemical constituents between wells in the Chicot aquifer system in southwestern 

Louisiana and wells in the Chicot equivalent aquifer system in southeastern Louisiana and

southwestern Mississippi, 2000-2001 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

9. Boxplots showing comparison of depth to top of screen and selected physicochemical 

properties and chemical constituents between wells in the outcrop areas of the Chicot and 

Chicot equivalent aquifer systems and wells south of the outcrop areas in southern Louisiana 

and southwestern Mississippi, 2000-2001 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

TABLES

 1. Site and construction information for selected domestic wells in southern Louisiana 

and southwestern Mississippi, 2000-2001 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

 2. Methods used to determine selected chemical constituents in water from domestic

wells in southern Louisiana and southwestern Mississippi, 2000-2001 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3. Summary statistics and Federal guidelines and standards for selected water-quality 

data from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001 . . . . . 14

4. Pesticides and degradation products analyzed for and detected in water from 

selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001. . . . . . . . . . . . . . 18

 5. Summary statistics and Federal guidelines and standards for pesticides and degradation products 

and volatile organic compounds detected in water from selected domestic wells in

southern Louisiana and southwestern Mississippi, 2000-2001 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

 6. Volatile organic compounds analyzed for and detected in water from selected domestic wells in 

southern Louisiana and southwestern Mississippi, 2000-2001 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

 7. Results of Spearman rank correlation test between depth to top of screen and selected physicochemical 

properties and chemical constituents in water from selected domestic wells in southern Louisiana and 

southwestern Mississippi, 2000-2001 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
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CONVERSION FACTORS, DATUMS, ABBREVIATED 

WATER-QUALITY UNITS, AND ACRONYMS

Multiply By To obtain

inch (in.) 25.4 millimeter (mm)

foot (ft) 0.3048 meter (m)

mile (mi) 1.609 kilometer (km)

square mile (mi2) 2.590 square kilometer (km2)

million gallons per day (Mgal/d) 3,785 cubic meters per day (m3/d)

Temperature in degrees Fahrenheit (°F) can be converted to degrees Celsius (°C) as follows: °C = (°F - 32)/1.8. 

Horizontal coordinate information in this report is referenced to the North American Datum of 1983.

Vertical coordinate information in this report is referenced to the National Geodetic Vertical Datum of 1929 (NGVD 29)--a 

geodetic datum derived from a general adjustment of the first-order level nets of both the United States and Canada, formerly called 

Sea Level Datum of 1929. 

Abbreviated water-quality units:

grams per kilogram (g/kg)

micrograms per liter (μg/L)

microsiemens per centimeter at 25 degrees Celsius (μS/cm)

milligrams per liter (mg/L)

milliliter (ml)

picocuries per liter (pCi/L)

Acronyms:

ACAD, Acadian-Pontchartrain (Study Unit)

DOC, dissolved organic carbon

DOTD, Louisiana Department of Transportation and Development

HA, Health Advisory

MCL, Maximum Contaminant Level

MCLG, Maximum Contaminant Level Goal

MDL, Method Detection Limit

MMM, Multimedia Mitigation (Program)

NAWQA, National Water-Quality Assessment (Program)

SMCL, Secondary Maximum Contaminant Level

USEPA, U.S. Environmental Protection Agency

USGS, U.S. Geological Survey

VOC, volatile organic compound
viii
1

QUALITY OF WATER IN DOMESTIC WELLS IN THE 

CHICOT AND CHICOT EQUIVALENT AQUIFER 

SYSTEMS, SOUTHERN LOUISIANA AND 

SOUTHWESTERN MISSISSIPPI, 2000-2001

By Roland W. Tollett, Robert B. Fendick, Jr., and Lane B. Simmons

ABSTRACT

 In 2000-2001, water-quality data were collected

from 60 randomly selected domestic wells in the

Acadian-Pontchartrain Study Unit, as part of the

National Water-Quality Assessment Program. The data

were collected from wells screened in shallow sands

(less than 350 feet below land surface) in two major

aquifer systems--the Chicot aquifer system in

southwestern Louisiana and the Chicot equivalent

aquifer system in southeastern Louisiana and

southwestern Mississippi. The Chicot equivalent

aquifer system is part of the Southern Hills regional

aquifer system, and both the Chicot aquifer system and

the Southern Hills regional aquifer systems are

designated as sole-source aquifers by the U.S. Environmental Protection Agency (USEPA).

The well depths ranged from 40 to 340 feet below

land surface with a median depth of 120 feet. The

ground-water-quality data included 5 physicochemical

properties, dissolved solids, 9 major inorganic ions, 24

trace elements, 6 nutrients, dissolved organic carbon,

109 pesticides and degradation products, and 85 volatile

organic compounds (VOC’s); and a subset of the wells

were sampled for radon, chlorofluorocarbons, and stable

isotopes.

Water from 35 of the 60 domestic wells sampled

had pH values less than the USEPA Secondary

Maximum Contaminant Level (SMCL) range of 6.5 to

8.5 standard units. Specific conductance ranged from 17

to 1,420 microsiemens per centimeter at 25 degrees

Celsius. Dissolved-solids concentrations in water from

two wells exceeded the SMCL of 500 mg/L (milligrams

per liter); the maximum concentration was 858 mg/L.

Sodium and calcium were the dominant cations, and

bicarbonate and chloride were the dominant anions. One

chloride concentration (264 mg/L) exceeded the SMCL

of 250 mg/L. One arsenic concentration (55.3 μg/L

[micrograms per liter]) exceeded the USEPA Maximum

Contaminant Level (MCL) of 10 μg/L. Iron concentrations in water from 22 wells exceeded the SMCL of

300 μg/L; the maximum concentration was 8,670 μg/L.

Manganese concentrations in water from 26 wells

exceeded the SMCL of 50 μg/L; the maximum

concentration was 481 μg/L. Health Advisories have

been established for six of the trace elements analyzed;

no concentrations were greater than these nonenforceable standards. Radon concentrations in water

from 9 of 50 wells sampled were greater than the

proposed USEPA MCL of 300 picocuries per liter.

Concentrations of ammonia, ammonia plus

organic nitrogen, and nitrite plus nitrate in water from

four wells were greater than 2 mg/L, a level that might

indicate anthropogenic influences. The median dissolved organic carbon concentration was an estimated

0.30 mg/L, which indicated naturally occurring

dissolved organic carbon conditions in the study area.

Eight pesticides and two degradation products were

detected in water from five wells. Twenty-four VOC’s

were detected in water from 44 wells. All concentrations of pesticides and VOC’s were less than USEPA

drinking-water standards.

 Quality-control samples, which included fieldblank samples, replicates, and field and laboratory

spikes, indicated no bias in ground-water data from

collection procedures or analyses. Variance between the

environmental samples and the corresponding replicate

samples was typically less than 5 percent, indicating an

acceptable degree of laboratory precision and data

collection reproducibility.

The Mann-Whitney rank-sum test was used to

compare depth to top of screen and selected

physicochemical properties and chemical constituents

between six groups of wells. Values for selected

physicochemical and chemical constituents were

typically greater in wells located in the Chicot aquifer

system than in the Chicot equivalent aquifer system.
2

Values for specific conductance, pH, calcium, sodium,

bicarbonate, chloride, dissolved solids, and iron were

typically greater in wells located south of the outcrop

areas of the Chicot and Chicot equivalent aquifer

systems than in wells located in the outcrop areas. The

increase in concentrations are considered normal

because dissolved solids and other constituents

generally increase down gradient along ground-water

flow paths. Most constituents were not significantly

different between the two outcrop areas or the two areas

south of the outcrop areas. The results of statistical

analyses indicated that water quality in a well is

influenced by the location of the well relative to the

outcrop area.

INTRODUCTION

Ground water is one of the Nation’s most

important resources and is the source of drinking water

for about 50 percent of the population, or about

130 million residents (U.S. Geological Survey, 1999a).

Because ground water is used for public-water supplies

and because of the potential for ground water to affect

surface-water quality and ecological and recreational

resources, degradation of ground-water quality as a

result of anthropogenic activities is a major concern. In

1991, the U.S. Geological Survey (USGS) began full

implementation of the National Water Quality

Assessment (NAWQA) Program to describe the status

and trends in the quality of the Nation’s surface- and

ground-water resources and to determine the natural and

anthropogenic factors affecting water quality (Hirsch

and others, 1988; Gilliom and others, 1995). Knowledge

of the quality of the Nation’s water resources is

important for the protection of human and aquatic health

and for the management of land and water resources and

the conservation and regulation of those resources.

More than 50 major river basins or aquifer systems,

referred to as study units, have been identified for

investigation as part of the NAWQA Program. Together,

these basins and aquifer systems include water resources

available to more than 60 percent of the population and

cover about one-half of the land area in the conterminous

United States. Ground-water studies in the NAWQA

Program include (1) subunit surveys, designed to assess

the water quality of major aquifer systems within a study

unit; (2) land-use studies, designed to assess the quality

of recently recharged ground water associated with

regionally extensive combinations of land use and

hydrogeologic conditions; and (3) flowpath studies,

designed to examine specific relations among land-use

practices, ground-water flow, contaminant occurrence

and transport, and surface- and ground-water

interactions (Gilliom and others, 1995). 

 In 2000-2001, a subunit survey was completed

for two major aquifer systems--the Chicot aquifer

system and the Chicot equivalent aquifer system of the

Southern Hills regional aquifer system--in the AcadianPontchartrain (ACAD) Study Unit. The ACAD Study

Unit encompasses most of southern Louisiana and a

small part of southwestern Mississippi (fig. 1).

Objectives of the study were to assess the occurrence

and distribution of water-quality constituents in recently

recharged ground water (generally less than 20 to 30

years old) in shallow sands (less than 350 feet below

land surface) and to gain an understanding of the natural

and anthropogenic factors that affect ground-water

quality. Water in shallow sands in southern Louisiana

and southwestern Mississippi is vulnerable to effects

from land-surface activities in the area because recharge

to the shallow sands occurs over most of their areal

distribution (Strickland and others, 1987). The shallow

sands are primarily located in the Chicot aquifer system

in southwestern Louisiana and in the Chicot equivalent

aquifer system of the Southern Hills regional aquifer

system in southeastern Louisiana and southwestern

Mississippi. The Chicot aquifer system and the

Southern Hills regional aquifer system are U.S. Environmental Protection Agency (USEPA) designated

sole-source aquifers (U.S. Environmental Protection

Agency, 2002c). This designation recognizes an aquifer

system as the sole or principal source of drinking water

for an area and also recognizes that no alternative

sources of drinking water are reasonably available

should the aquifer become contaminated. Shallow

depths to ground water and lack of a substantial,

continuous confining unit to slow downward migration

of contaminants from the land surface contribute to the

potential for degradation of water quality in these

aquifers.

Purpose and Scope

This report describes quality of water in domestic

wells in the Chicot and Chicot equivalent aquifer

systems in southern Louisiana and southwestern

Mississippi, and relates that water quality to natural

factors, such as depth to ground water, and

anthropogenic activities, such as pesticide and fertilizer

use. Water samples collected from 60 randomly selected

domestic wells were analyzed for 5 physical and

chemical-related (physicochemical) properties,

dissolved solids, 9 major inorganic ions, 24 trace

elements, 6 nutrients, dissolved organic carbon,

109 pesticides and degradation products, and

85 volatile organic compounds (VOC’s); and a subset of

the wells were sampled for radon, chlorofluorocarbons

(CFC’s), and stable isotopes. 

4

These constituents were compared to USEPA

drinking-water guidelines and standards for a frame of

reference. Statistical analyses were used to determine

possible relations between the top of screened interval,

selected physicochemical properties and chemical

constituents, and well locations. Selected physicochemical properties and chemical constituents were

compared between groups of wells in the two major

aquifer systems--the Chicot and Chicot equivalent

aquifer systems. Data from this report can be compared

to data from similar studies throughout the United States

to assess the quality of the Nation’s water resources to

determine any long-term changes in water quality, and to

identify the natural and anthropogenic factors that might

affect water quality (Gilliom and others, 1998).

Acknowledgments

The authors express appreciation to the well

owners in the area for allowing the USGS access to

sample and collect information concerning their wells.

Also, the authors express appreciation to Zahir “Bo”

Bolourchi, Chief, Public Works and Water Resources

Division, Louisiana Department of Transportation and

Development, and the Mississippi Department of

Environmental Quality, from which most of the well

data were obtained.

DESCRIPTION OF STUDY AREA

The ACAD Study Unit includes all or parts of 39

parishes in southern Louisiana and 5 counties in

southwestern Mississippi. The 26,000-mi2

 study unit

extends north to the headwaters of the Calcasieu River in

west-central Louisiana, and the headwaters of the Amite

and Tangipahoa Rivers in southwestern Mississippi; east

near the Pearl River; south near the Gulf of Mexico; and

west near the Sabine River. The study unit is centrally

bounded by the Atchafalaya Floodway and the

Mississippi River (fig. 1). The study area differs from

the ACAD Study Unit because the southern limit

extends to the Gulf Intracoastal Waterway in the western

part of the study area and to an area north and west of

Lake Pontchartrain in the eastern part of the study area

(fig. 1). Land-surface elevations range from less than 5

feet above NGVD 29 near the coast to more than 600 feet

above NGVD 29 in southwestern Mississippi. 

Climate

The climate in southern Louisiana and

southwestern Mississippi is humid and subtropical.

Warm temperatures prevail from May through

September with generally mild temperatures during the

remainder of the year. The average annual rainfall and

temperature for the 2-year period, 2000-2001, was

obtained at two selected stations: Oberlin Fire Tower, in

southwestern Louisiana, and Amite, in southeastern

Louisiana (Elizabeth Mons, Louisiana State Office of

Climatology, written commun., 2002). In 2000, the

annual rainfall at the Oberlin Fire Tower was

45.5 inches, about 21.4 inches below the 30-year normal

(1971-2000), and the annual rainfall at Amite was

47.2 inches, about 18.5 inches below the 30-year

normal. In 2001, the annual rainfall at the Oberlin Fire

Tower was 64.0 inches, about 2.9 inches less than the

30-year normal, and the annual rainfall at Amite was

73.4 inches, about 7.7 inches greater than the 30-year

normal. In 2000, the average annual temperature at

Oberlin Fire Tower was 68.3°F and was 66.7°F at Amite;

both average annual temperatures were about 0.5°F

above the 30-year normals for their respective locations.

In 2001, the average annual temperature at the Oberlin

Fire Tower was 0.3°F below the 30-year normal and

0.2°F above the 30-year normal at Amite.

Hydrogeologic Setting

Southwestern Louisiana is underlain by a thick

sequence of southerly and southeasterly dipping

interbedded clays, silts, sands, and gravels. Freshwaterbearing aquifers in southwestern Louisiana, from

youngest to oldest, are the Chicot aquifer system (fig. 2),

Evangeline aquifer, Jasper aquifer system, and

Catahoula aquifer (not shown). The Evangeline aquifer,

Jasper aquifer system, and Catahoula aquifer contain

freshwater only in the northern part of the study area and

are not discussed in this report. 

 In the Lake Charles area, the Chicot aquifer system includes the “200-foot,” “500-foot,” and “700-foot”

sands. East of the Lake Charles area (in the rice-growing

area), the Chicot aquifer system includes two major

units, the upper sand and an undifferentiated lower sand

(Nyman, 1984; fig. 2). The sands generally are several

hundred feet thick and are separated in places by thick

discontinuous clays (Nyman and others, 1990). Wells

located in the outcrop area are generally considered to

be under unconfined or semi-confined conditions and

wells located south of the outcrop area are generally

considered to be under confined conditions (fig. 3).

Southeastern Louisiana and southwestern

Mississippi are underlain by gulfward thickening and

dipping, complexly interbedded series of clayey and

sandy formations (Buono, 1983). Aquifers in this area,

from youngest to oldest, are the Chicot equivalent

6

aquifer system, Evangeline equivalent aquifer system,

Jasper equivalent aquifer system, and Catahoula

equivalent aquifer system (not shown in fig. 2). These

four aquifer systems are referred to as the Southern Hills

regional aquifer system.

The Chicot equivalent aquifer system (fig. 2)

consists of the Mississippi River alluvial aquifer and the

shallow, “400-foot,” and “600-foot” sands of the Baton

Rouge area, the upland terrace and upper Ponchatoula

aquifers east of the Baton Rouge area in southeastern

Louisiana, and alluvial deposits and the Citronelle

Formation in southwestern Mississippi (Buono, 1983;

Lovelace and Lovelace, 1995). Wells located in the

outcrop area are generally considered to be under

unconfined or semi-confined conditions, and wells

located south of the outcrop area are generally

considered to be under confined conditions (fig. 3).

Land Use, Water Use, and Population

 The primary land uses in southern Louisiana and

southwestern Mississippi are agriculture and forestry

(fig. 4). In southwestern Louisiana, most land is used for

agriculture, followed by forestry and urban

development. The Atchafalaya River borders southwestern Louisiana to the east, and wetlands and coastal

marshes border this area to the south. In southeastern

Louisiana and southwestern Mississippi, most land is

used for forestry, followed by agriculture and urban

development. Southeastern Louisiana and southwestern

Mississippi are bordered by the Mississippi River to the

west and by wetlands and coastal marshes and open

water to the south.

The Chicot aquifer system was the most heavily

pumped aquifer system in southwestern Louisiana, and

also was the most heavily pumped in the State. In

1999-2000, the Chicot aquifer system supplied about

798 Mgal/d of water (Sargent, 2002). About 542 Mgal/d

was used for irrigation, of which about 537 Mgal/d was

used for rice irrigation, and about 89 Mgal/d was used

for public supply.

The Chicot equivalent, Evangeline equivalent,

and Jasper equivalent aquifer systems were used as

sources for ground water in southeastern Louisiana and

southwestern Mississippi. In 1999-2000, the Chicot

equivalent aquifer system supplied about 77 Mgal/d for

industrial, domestic use, public supply, and other uses

(Sargent, 2002). The Evangeline equivalent aquifer

system supplied about 86 Mgal/d, and the Jasper

equivalent aquifer system supplied more than

128 Mgal/d mainly for public supply and industrial use. 

In 2000, the total population in the southwestern

part of the study area was about 889,000 people (U.S.

Census Bureau, 2002). The city of Lafayette (population about 110,000) had the largest population in this

area, followed by Lake Charles (population about

72,000) and Opelousas (population about 23,000). 

In 2000, the total population in the southeastern

part of the study area was about 940,000 people (U.S.

Census Bureau, 2002). Baton Rouge (population about

228,000) had the largest population in the study area,

followed by Hammond (population about 18,000). 

METHODS

The NAWQA guidelines used to design the study

discussed in this report are described in Gilliom and

others (1995). NAWQA ground-water protocols

(Lapham and others, 1997; Koterba, 1998) were

followed during data collection. Standardization of

data-collection protocols was intended to produce a

nationally consistent data base for statistically valid

interpretations. The following sections describe how the

protocols were applied.

Well Site Selection

Well site selection criteria followed those published in

Lapham and others (1997) and Koterba (1998). The

main criterion used for site selection was that the site be

located in outcrop areas of or areas overlying the Chicot

aquifer system and Chicot equivalent aquifer system.

The goal of the well site selection process was to select

a total of 60 randomly spaced wells used for domestic

supply, 30 in shallow sands in southwestern Louisiana

and 30 in shallow sands in southeastern Louisiana and

southwestern Mississippi. A computer generated

program (Scott, 1990) was used to divide each of the two

areas into 30 equal-area cells. The program then

randomly selected wells used for domestic supply in

each cell. Well-construction and geologic information

were reviewed for each potential site. Each well was

then located in the field and evaluated for inclusion in the

sampling network. The wells were checked for

accessibility, construction integrity, and site

identification.

Three wells were located outside the study area.

These wells were selected because they satisfied the

main NAWQA criterion and were located near

computer-generated cells.


9

Well Construction

A summary of well-construction information for

the sampled wells is listed in table 1. Site and well

construction information were obtained from well

registration forms and well owners. Most wells (51)

were constructed of polyvinyl chloride (PVC). Three

wells were constructed of steel, and six wells were

constructed of material not identified (unknown). The

wells ranged in depth from 40 to 340 feet below land

surface, with a median depth of 120 feet. Well casings

were 2 to 4 inches in diameter. Screened intervals

ranged from 5 to 30 feet in length, with a median length

of 10 feet. Land-surface elevation for the wells ranged

from 10 to 412 feet above NGVD 29.

Sample Collection and Analysis

Sixty domestic wells were sampled in southern

Louisiana and southwestern Mississippi from June 2000

through September 2001. Water samples were collected

near the wellhead and before the pressure tank or any

treatment, if possible. Wells were purged of three casing

volumes to remove possible stagnant water. After the

stagnant water was removed, measurements of dissolved

oxygen, specific conductance, pH, and temperature were

monitored about every 5 minutes in a closed-cell, flowthrough chamber until stable readings were obtained.

After stable readings were obtained for physicochemical

properties, water was redirected to the clean sampling

chamber, and sample water was immediately collected

for analysis.

Samples were collected and processed according

to parts-per-billion-level protocols described in Koterba

and others (1995). To minimize the risk of

contamination, all sample collection and preservation

took place in chambers consisting of clear polyethylene

bags supported by a PVC frame. The polyethylene bags

that formed the sample-collection and -preservation

chambers were replaced between each samplecollection site. After all samples were collected at a site,

sampling equipment was cleaned thoroughly using a

progression of nonphosphate detergent wash, tap-water

rinse, and a final deionized-water rinse. A final

methanol rinse was used to clean the pesticide sampling

equipment. All sampling equipment was stored in clean

plastic bags or containers between sample-collection

sites. Ground-water samples were chilled as required by

USGS guidelines and shipped to the USGS National

Water Quality Laboratory (NWQL) in Lakewood,

Colorado, for analysis. CFC’s and selected stable

isotope samples were collected according to USGS

guidelines and analyzed at the USGS Laboratory in

Reston, Virginia. Methods used to analyze the water

samples are listed in table 2. Water-quality data are

tabulated in appendixes at the back of the report. 

The USEPA has established drinking-water

standards for physicochemical properties and chemical

constituents that might have adverse effects on human

health or affect the odor, appearance, or desirability of

water (U.S. Environmental Protection Agency, 2002a).

Comparisons were made between concentrations of

selected constituents and USEPA Maximum

Contaminant Levels (MCL’s), Secondary Maximum

Contaminant Levels (SMCL’s), and Health Advisories

(HA’s). An MCL is the maximum permissible level of a

contaminant that is allowed in drinking water and is an

enforceable standard for public drinking-water supplies.

An SMCL is a nonenforceable guideline regarding

aesthetic effects (such as taste, odor, or color) or

cosmetic effects (such as tooth or skin discoloration)

caused by drinking water. An HA is a nonenforceable

guideline that serves as an estimate of acceptable

concentrations of a chemical based on health effects

information and serves as technical guidance to assist

Federal, State, and local officials. Although the

domestic wells sampled for the study described in this

report are not used for a public-supply source of drinking

water, concentrations of selected constituents in the

water were compared to the USEPA MCL’s, SMCL’s,

and HA’s to provide a frame of reference.

 Quality-Control Data 

Quality-control (QC) data were collected to test

sample-collection procedures, sample processing, and

laboratory analysis. QC samples collected included

field-blank samples, replicate environmental samples,

and field- and laboratory-spiked samples (Mueller and

others, 1997). Field-blank samples were collected to

verify that cleaning procedures were sufficient and that

collection and analysis procedures did not contaminatethe sample. Replicate environmental samples

were collected to assess the effects of sample-collection

methods and laboratory-analysis procedures on

measurement variability. The spiked samples (field and

laboratory) were environmental samples injected with a

known concentration of the analyte(s) of interest to

determine the accuracy and precision of organic

analyses, the stability of analytes during typical holding

times, and whether characteristics of the environmental

samples might interfere with the analysis of the analytes.
10

ACAD 

well number

(fig. 1)

Local well 

number

Date well

constructed

Casing

material Aquifer code Depth of well (feet) Diameter of well (inches) Depth to top of screen (feet) Depth to bottom of s

(feet) 

31 Be-6084Z 6-04-1996 P 112CHCT 197 2 187 197 32 Be-5928Z 3-08-1991 P 112CHCT 90 2 80 90 33 Be-6065Z 8-08-1995 P 112CHCT 250 2 245 250 34 Ev-5500Z U U 112CHCT 43 2 38 43 35 JD-5177Z 10-03-1983 P 112CHCTU 100 4 90 100 36 JD-5371Z 1-27-1985 P 112CHCTU 230 4 220 230 37 Be-5764Z 4-05-1989 P 112CHCT 150 2 140 150 38 Ac-6896Z 1975 P 112CHCTU 96 2 86 96 39 Be-6077Z 9-04-1995 P 112CHCT 180 2 175 180 40 Al-5243Z 4-07-1989 P 112CHCT 105 2 95 105 41 Ve-7436Z 1-29-1988 U 112CHCTU 160 2 154 160 42 Ve- 170 1948 U 112CHCTS 70 2 50 70 43 Cu-7082Z 8-15-1988 P 11202LC 260 4 240 260 44 V-8701Z 10-19-1970 P 112CHCT 60 3 50 60 45 Ve-9241Z 6-19-1996 P 112CHCTS 90 2 80 90 46 Cn-5874Z 10-20-76 S 11202LC 340 2 334 340 47 SL-6924Z U S 112CHCTC 50 2 40 50 48 R-5964Z 7-07-1995 P 112CHCT 110 4 80 110 49 Ac-6998Z 1973 P 112CHCTU 200 4 190 200 50 JD-5938Z 9-25-89 P 112CHCT 145 4 140 145 51 Cu-7967Z 9-24-91 P 11202LC 220 2 210 220 52 Cu-7410Z U S 112CHCT 220 2 210 220 53 Ac-6112Z 3-10-88 P 112CHCTU 170 2 160 170 54 Lf-9803Z U P 112CHCTU 100 2 U U 55 Al-5167Z 6-02-92 P 112CHCT 91 2 81 91 56 Al-5506Z U P 112CHCT 105 U U U 57 Ac-6512Z 8-23-90 P 112CHCT 185 2 179 185 58 Ev-5508Z U P 112CHCT 140 2 130 140 59 Cu-5250Z 7--05-83 U 11202LC 140 2 128 138 60 Al-5240Z 11-19-88 P 112CHCT 100 2 90 100 

Table 1. Site and construction information for selected domestic wells in southern Louisiana and southwestern Mississippi[ACAD, Acadian-Pontchartrain Study Unit of the National Water-Quality Assessment Program; P, plastic; U, unknown; S, steel; Chicot aquifer system: 112CHCT, undif

sand unit; 112CHCTS, shallow sand unit; 11202LC, "200-foot" sand of Lake Charles area; Chicot equivalent aquifer system: 112UPTC, upland terrace aquifer; 11204BR, 

area; 12101FP, Zone 1 Florida Parishes and Pointe Coupee Parish; 112SLBR, shallow sands of Baton Rouge area; 121CRNL, Citronelle formation (Mississippi); 112PNC

122MOCN, Miocene series] 
11

ACAD 

well number

(fig. 1)

Local well 

number

Date well

constructed

Casing

material Aquifer code Depth of well (feet) Diameter of well (inches) Depth to top of screen (feet) Depth to bottom of 

(feet) 

61 SH-5527Z 5-06-94 P 112UPTC 70 4 60 70 62 SH-5460Z 11-28-92 P 112UPTC 90 4 80 90 63 EF-5282Z 5-0-94 P 112UPTC 120 4 110 120 64 EF-5422Z 9-23-98 P 112UPTC 80 4 70 80 65 ST-6753Z 10-17-91 P 112UPTC 108 4 98 108 66 ST-8617Z 9-27-93 P 112UPTC 90 4 80 90 67 EB-6257Z 10-11-91 P 11204BR 210 2 200 210 68 EF-5348Z 11-04-96 P 12101FP 140 4 130 140 69 EF-5450Z 10-15-99 P 112UPTC 160 4 150 160 70 Li-7429Z 5-15-01 P 112SLBR 40 2 30 40 71 Li-7282Z 5-04-00 P 11204BR 310 2 257 267 72 Ta-8435Z 10-18-95 P 112UPTC 110 4 100 110 73 SH-5344Z 1-18-90 P 112UPTC 190 4 180 190 74 Li-7148Z 6-03-99 P 112SLBR 126 2 116 126 75 Ta-7292Z 2-19-93 P 112UPTC 210 2 200 210 76 Ta-788 4-16-92 P 112UPTC 60 4 30 60 77 Wa-7324Z 1973 P 112UPTC 110 4 100 110 78 MS.AM-D016 10-14-68 P 121CRNL 85 4 79 85 79 MS.PK-G021 4-22-64 U 121CRNL 120 4 113 120 80 ST-6940Z 4-13-90 P 112UPTC 160 4 150 160 81 Ta-9622Z 10-06-98 P 112UPTC 100 4 80 100 82 EF-5228Z 11-14-90 P 112UPTC 80 4 70 80 83 Ta-815 12-30-92 P 112UPTC 80 4 70 80 84 Ta-6551Z 4-16-92 P 112UPTC 93 4 83 93 85 Li-6487Z 5-30-92 U 112SLBR 200 2 190 200 86 EB-8065Z 8-24-98 P 112SLBR 180 2 170 180 87 Li-6203Z 6-10-92 P 112SLBR 90 2 80 90 88 WF-5115Z 12-13-91 P 112UPTC 150 4 120 150 89 Ta-7401Z 4-22-93 P 112PNCLU 320 4 300 320 90 MS.AM-M006 4-06-71 P 122MOCN 124 4 118 124 

Table 1. Site and construction information for selected domestic wells in southern Louisiana and southwestern Mississippi
12

Table 2. Methods used to determine selected chemical constituents in water from domestic wells in southern

Louisiana and southwestern Mississippi, 2000-2001

[AA, atomic absorption spectrometry; ICP, inductively-coupled plasma; MS, mass spectrometry; C, carbon; 2H, deuterium; 1H, hydrogen; 18O, oxygen-18; 16O, oxygen-16; GC, gas chromatography; UV, ultraviolet]

Constituent Analytical method Reference

Major inorganic ions AA, Colorimetry, or ICP Fishman and Friedman (1989) and

Fishman (1993)

Trace elements AA or ICP-MS Faires (1993), Garbarino (1999), 

and McLain (1993)

Radon Liquid scintillation American Society for Testing and 

Materials (1996)

Chlorofluorocarbons GC with electron capture device Busenberg and Plummer (1992)

2H/1H Hydrogen equilibrium and MS Coplen and others (1991)

18O/16O Carbon dioxide equilibrium and MS Epstein and Mayeda (1953)

Nutrients Colorimetry Fishman (1993), Patton and Truitt (2000), 

and U.S. Environmental Protection 

Agency (1993)

Dissolved organic carbon UV-persulfate oxidation and infrared spectrometry Brenton and Arnett (1993)

Pesticides and degradation products Solid-phase extraction using a C-18 cartridge and GC/MS

Determination of low concentrations of acetochlor in water by 

automated solid-phase extraction and GC with mass selective 

detection

Graphitized carbon-based solid-phase extraction and 

high-performance liquid chromatography/MS

Zaugg and others (1995)

Lindley and others (1996)

Furlong and others (2001)

Volatile organic compounds Purge and trap capillary GC/MS Rose and Schroeder (1995)

Field-blank samples were collected and analyzed

at five sites for concentrations of major inorganic ions,

trace elements, nutrients, DOC, pesticides, and VOC’s.

The source solution for field-blank samples was organicfree or inorganic-free water passed through all sampling

equipment in the field and placed in the appropriate

bottles. Few water-quality constituents analyzed were

detected in the field-blank samples. Major-inorganicion concentrations were less than the method detection

limit (MDL) or estimated values, and most traceelement concentrations were at or less than the MDL.

Aluminum, copper, lead, nickel, selenium, and zinc were

all detected once at concentrations slightly greater than

the MDL. Arsenic and strontium were detected once at

estimated values slightly less than the MDL. No

nutrients, pesticides, or VOC’s were detected in the

field-blank samples. DOC was detected in three blank

samples at concentrations slightly greater than the MDL.

Results of field-blank analyses indicated cleaning

procedures were adequate to prevent on-site and site-tosite contamination.

Replicate environmental samples for all

constituents were collected at six sites. The relative

percent difference between the environmental sample

and corresponding replicate sample was calculated using

100 multiplied by the absolute value of the difference in

replicate concentrations divided by the summation of

replicate concentrations. The variability between the

environmental samples and the corresponding replicate

samples was typically less than 5 percent. Results of

replicate environmental sample analyses indicated an

acceptable degree of laboratory precision and data

collection reproducibility.

Field-spiked samples were collected from eight

wells and laboratory-spiked samples were collected

from four wells. Field-spiked samples were collected by

adding known amounts of pesticides to environmental

samples and replicate environmental samples at the time

of sampling. Laboratory-spiked samples were collected

by adding known amounts of pesticides to

environmental samples at NWQL. VOC’s were spiked

using the same procedure. Mean recovery of pesticides

and VOC’s from spiked samples ranged from 72 to

119 percent. Mean recovery of pesticides and VOC’s

from spiked samples were within the NWQL control

limits, indicating the sampling and analysis procedures

adequately detected the compounds analyzed and that

there were no major matrix interferences. Quality-
13

control samples, which included field blanks, replicates,

and field and laboratory spikes, indicated no bias in

ground-water data from collection procedures or

analyses. 

Statistical Techniques

The Spearman rank correlation (SAS Institute

Inc., 1990) with an alpha value of 0.05 was used to

determine significant correlations between depth to top

of screen and selected constituents in ground water used

for domestic supply. Concentrations of major inorganic

ions and trace elements less than the reporting level were

assigned a value of one-half the reporting level so they

would not have a rank equal to that of a measured value.

Correlation analysis assesses not only the relation

between two continuous variables, but also the strength

of the relation (Helsel and Hirsch, 1993, p. 210-217).

The Spearman rank correlation was selected because

water-quality data are usually not normally distributed

and the number of samples was greater than 20 (Helsel

and Hirsch, 1993, p. 217-218). Scatter plots were made

of all parameters to determine whether there was a

monotonic correlation (Helsel and Hirsch, 1993

p. 209-211) between the top of screen and the selected

constituents.

Correlation tests calculate a probability statistic

(p-value) and a correlation coefficient (rho). The

probability statistic relates to the confidence level. The

95-percent confidence level used in this report indicated

a 95-percent probability (p equal to or less than 0.05)

that a correlation was statistically significant. The

correlation coefficient describes the strength of the

correlation and how the correlated parameters (physical

properties and physicochemical and chemical

constituents) vary. For this report, constituents with a

correlation coefficient of 0.6 or greater are considered

strongly correlated, parameters with correlation

coefficients between 0.4 and 0.6 are considered

moderately correlated, parameters with a correlation

coefficient of 0.4 and less are considered weakly

correlated, and parameters with a correlation coefficient

less than 0.2 are considered to have little or no

correlation. A positive correlation coefficient means that

as the value of one parameter increases, the value of the

other parameter also increases. A negative or inverse

correlation coefficient means that as the value of one

parameter decreases, the value of the other parameter

increases (Helsel and Hirsch, 1993, p. 209-211).

The Mann-Whitney rank-sum test (SAS Institute

Inc., 1990) with an alpha value of 0.05 was used to

compare depth to top of screen and selected

physicochemical properties and chemical constituents

(specific conductance, pH, calcium, sodium,

bicarbonate, chloride, dissolved solids, iron, and radon)

between wells in two aquifer systems--the Chicot and

Chicot equivalent. Wells were placed into six groups.

Group CH includes 30 wells in the Chicot aquifer system

in southwestern Louisiana, Group CHO includes 9 wells

in the outcrop area, Group CHS includes 21 wells south

of the outcrop area, Group CHE includes 30 wells in the

Chicot equivalent aquifer system in southeastern

Louisiana and southwestern Mississippi, Group CHEO

includes 20 wells in the outcrop area, and Group CHES

includes 10 wells south of the outcrop area. Wells 32,

52, and 77 were located outside the study area (fig. 3).

Well number 32 was placed in Group CHO, well number 52 was placed in Group CHS, and well number 77

was placed in Group CHEO. Five comparisons were

made between the groups: CH wells were compared to

CHE wells, CHO wells were compared to CHS wells,

CHEO wells were compared to CHES wells, CHO wells

were compared to CHEO wells, and CHS wells were

compared to CHES wells.

QUALITY OF WATER IN DOMESTIC 

WELLS 

Water-quality data were collected from 60 wells

used for domestic supply in southern Louisiana and

southwestern Mississippi. The water-quality data are

grouped by type: physicochemical properties; dissolved

solids and major inorganic ions; trace elements, radon,

chlorofluorocarbons, and stable isotopes; nutrients and

DOC; pesticides and degradation products; and VOC’s.

Physicochemical Properties

Physicochemical properties, including specific

conductance, pH, air and water temperature, and

alkalinity, were used to determine ground-water

conditions, such as acidity and buffering capacity, at the

time of sample collection. A statistical summary with

applicable USEPA standards for these properties is listed

in table 3. Specific conductance ranged from 17 to

1,420 μS/cm, and had a median value of 122 μS/cm.

The SMCL for pH is 6.5 to 8.5 standard units (U.S.

Environmental Protection Agency, 2002b), and pH for

35 of the 60 wells sampled was less than 6.5 standard

units. The alkalinity, as calcium carbonate, ranged from

4.0 to 360 mg/L. Values for specific conductance, pH,

and alkalinity were typical for the Chicot aquifer and the

Chicot equivalent aquifer systems (Nyman, 1989;

Buono, 1983; Nyman and Fayard, 1978). Physicochemical properties for all wells sampled are listed in

appendix 1.
14

Dissolved Solids and Major Inorganic Ions

Dissolved-solids concentrations ranged from 16

to 858 mg/L (table 3). The median dissolved-solids

concentration was 108 mg/L, far less than the 500 mg/L

SMCL (U.S. Environmental Protection Agency, 2002b).

Samples from two wells had concentrations of dissolved

solids greater than the SMCL. Although ground water

containing more than 500 mg/L dissolved solids is

undesirable for drinking water and irrigation, such water

is used in many areas of the country where less

mineralized water is not available. Concentrations of

dissolved solids are listed in appendix 2.

Table 3. Summary statistics and Federal guidelines and standards for selected water-quality data from 

selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001

[All chemical constituents are dissolved unless otherwise noted. MCL, Maximum Contaminant Level; SMCL, Secondary Maximum Contaminant 

Level; HA, Health Advisory; USEPA, U.S. Environmental Protection Agency; μS/cm, microsiemens per centimeter at 25 degrees Celsius; --, no 

value available; o

C, degrees Celsius; mg/L, milligrams per liter; E, estimated; <, less than; μg/L, micrograms per liter; ND, not detected; pCi/L, 

picocuries per liter] 

Property or constituent

Number of 

detections/

number of 

samples

Analytical 

reporting 

level

Median of 

all 

samples

Minimum 

detection

Maximum 

detection

Federal guideline or 

standarda

Number of 

wells 

exceeding 

USEPA 

drinkingwater 

standard

MCL SMCL HA

Physicochemical properties

Specific conductance, field, 

in μS/cm 58/58 1 122 17 1,420 -- -- -- --

pH, field, in standard units 60/60 .1 6.2 4.7 8.1 -- 6.5-8.5 -- b

35

Air temperature, in °C 54/54 .1 28.8 6.5 40 -- -- -- --

Water temperature, in °C 57/57 .1 21.8 14 28.4 -- -- -- --

Alkalinity, as CaCO3, field, 

in mg/L

60/60 1 42 4.0 360 -- -- -- --

Dissolved solids and major inorganic ions, in mg/L

Dissolved solids, residue on 

evaporation, 180°C 58/58 10 108 16 858 -- 500 -- 2

Calcium, as Ca 60/60 .01 4.68 .10 129 -- -- -- --

Magnesium, as Mg 60/60 .01 1.68 .290 39.5 -- -- -- --

Sodium, as Na 60/60 .10 14.4 1.9 111 -- -- -- --

Potassium, as K 60/60 .1 1.40 E.08 3.55 -- -- -- --

Bicarbonate, as HCO3

(calculated)

60/60 1 40 3 439 -- -- -- --

Sulfate, as SO4 60/60 .30 .45 .1 24.1 -- 250 -- 0

Chloride, as Cl 60/60 .30 7.5 2.6 264 -- 250 -- 1

Fluoride, as F 60/60 .1 <.2 .10 .5 4.0 2.0 -- 0

Bromide, as Br 60/60 .03 .04 .01 1.10 -- -- -- --

Silica, as S 60/60 .13 24.8 8.6 62.5 -- -- -- --

Trace elements, in μg/L

Aluminum, as Al 21/60 1.0 <1.0 1.0 77 -- 50-200 -- 1

Antimony, as Sb 13/60 .048 <1.0 E.03 .06 6 -- -- 0

Arsenic, as As 31/60 .18 E.1 E.1 55.3 10 -- -- 1

Barium, as Ba 60/60 1.0 6.5 8.0 587 2,000 -- -- 0

Beryllium, as Be 11/60 .06 <.06 E.03 .37 4 -- -- 0

Boron, as B 60/60 7.0 14.0 E4.0 177 -- -- 600 0

Cadmium, as Cd 9/60 0.037 <.04 E.02 0.14 5 -- -- 0

Chromium, as Cr 15/60 .8 <.8 E.4 5.4 c

100 -- -- 0
15

Trace elements, in μg/L—Continued

Cobalt, as Co 43/60 0.015 0.04 E.02 4.65 -- -- -- --

Copper, as Cu 46/60 .23 .9 E.1 196 d

1,300 1,000 -- 0

Iron, as Fe 43/60 10 55 10 8,670 -- 300 -- 22

Lead, as Pb 32/60 .08 .08 E.04 5.33 15 -- -- 0

Lithium, as Li 58/60 .30 4.0 E.2 36.6 -- -- -- --

Manganese, as Mn 40/60 2.2 12.4 1.0 481 -- 50 -- 26

Mercury, total, as Hg 0/19 .011 ND ND ND 2 -- -- 0

Molybdenum, as Mo 19/60 .2 <1.0 E.1 7.6 -- -- 40 0

Nickel, as Ni 40/60 .06 .25 .06 13.5 -- -- 100 0

Selenium, as Se 17/60 .33 <.3 E.2 7.2 50 -- -- 0

Silver, as Ag 0/60 1.0 ND ND ND -- 100 -- 0

Strontium, as Sr 60/60 .08 63 2.84 889 -- -- 4,000 0

Thallium, as Tl 9/60 .041 <.9 E.01 .45 2 -- 0.5 0

Uranium, as U 18/60 .018 <.04 .02 8.6 e

20 -- -- 0

Vanadium, as V 26/60 .21 <1.0 .02 4.8 -- -- -- --

Zinc, as Zn 55/60 1.0 4.5 1.0 585 -- 5,000 2,000 0

Radon, in pCi/L

Radon 50/50 26 225 27 1,320 f

300 -- -- 9

Nutrients and dissolved organic carbon, in mg/L

Ammonia, as N 29/60 .041 <.041 .022 2.56 -- -- 30 0

Ammonia plus organic

 nitrogen, as N 25/60 .10 <.10 E.05 2.7 -- -- -- --

Nitrite plus nitrate, 

 as N 34/60 .047 E.034 E.028 2.3 10 -- -- 0

Nitrite, as N 7/60 .008 <.006 E.003 .017 1.0 -- -- 0

Phosphorus, as P 50/60 .0044 .058 E.004 .88 -- -- -- --

Orthophosphate, as P 48/60 .018 .040 E.011 .8 -- -- -- --

Dissolved organic carbon, 

 as C 51/60 .33 E.30 E.16 9.9 -- -- -- --

Property or constituent

Number of 

detections/

number of 

samples

Analytical 

reporting 

level

Median of 

all 

samples

Minimum 

detection

Maximum 

detection

Federal guideline or 

standarda

Number of 

wells 

exceeding 

USEPA 

drinkingwater 

standard

MCL SMCL HA

 Major inorganic ions were the primary constituents of dissolved solids in ground-water samples. Major

inorganic ions consisted of the positively charged cations:

calcium, magnesium, potassium, and sodium; the

negatively charged anions: bicarbonate, sulfate, chloride,

fluoride, and bromide; and one uncharged ion: silica. A

statistical summary for the dissolved solids and major

inorganic ions is listed in table 3 with applicable drinkingwater standards. Water samples collected from one well

exceeded the SMCL of 250 mg/L for chloride (U.S.

Environmental Protection Agency, 2002b). Fluoride and

sulfate did not exceed USEPA established drinking-water

standards in any well sampled. Concentrations of major

inorganic ions are listed in appendix 2.

Table 3. Summary statistics and Federal guidelines and standards for selected water-quality data from 

selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001--Continued

a

U.S. Environmental Protection Agency (2002b): bnumber of values less than 6.5 standard units; ctotal concentration; dU.S. 

Environmental Protection Agency Maximum Contaminant Level goal (MCLG); e

under review; and fThe USEPA has an MCL for radon in 

ground water of 300 pCi/L for states without a Multimedia Mitigation Program and an alternate Maximum Contaminant Level of 4,000 pCi/L 

for states with an Multimedia Mitigation Program.
16

Water types were classified by the percentages of

major inorganic ions in the water samples. Because

potassium concentrations were low, those

concentrations were added to sodium concentrations

before classifying the water types. Sodium (50 wells)

and calcium (10 wells) were the dominant cations, and

bicarbonate (44 wells) and chloride (16 wells) were the

dominant anions. Water types were classified as

follows: 1 well, sodium chloride; 5 wells, sodium

bicarbonate; 1 well, mixed cation chloride; 13 wells,

mixed cation bicarbonate; 30 wells, mixed cation mixed

anion; and 10 wells, sodium mixed anion. Mixed cation

types had two or more cations for which the percent of

each was greater than 20 percent of the total cations.

Mixed anion types had two or more anions for which the

percent of each was greater than 20 percent of the total

anions. Sulfate concentrations were low in most of the

ground-water samples. The many different water types

in the study area reflect the variability of lithology in the

shallow aquifers in the study area.

Trace Elements

Trace elements occur naturally in water at

concentrations less than 1,000 μg/L (Drever, 1988,

p. 326). Most of the trace elements detected in ground

water are metals or semi-metallic elements produced

from the weathering of minerals. Concentrations of all

24 trace elements analyzed, except for one iron

concentration, were less than 1,000 μg/L (table 3). Of

the trace elements analyzed, 12 have MCL’s and only 1

concentration was greater than the MCL. Arsenic

exceeded the MCL of 10 μg/L in water from one well,

with a concentration of 55.3 μg/L. Six of the trace

elements analyzed have established SMCL’s, and three

had concentrations greater than these SMCL’s. Water in

one well had an aluminum concentration of 77 μg/L and

was within the SMCL range of 50 to 200 μg/L.

Concentrations of iron exceeded the SMCL of 300 μg/L

in samples from 22 wells; the maximum concentration

was 8,670 μg/L. Concentrations of manganese exceeded

the SMCL of 50 μg/L in samples from 26 wells, with a

maximum concentration of 481 μg/L. HA’s were

established for six of the trace elements analyzed; no

concentrations were greater than these nonenforceable

standards (U.S. Environmental Protection Agency,

2002b). Barium, boron, and strontium were the only

trace elements detected in all 60 samples, and two of the

trace elements analyzed, mercury and silver, were not

detected in any of the ground-water samples.

Concentrations of all trace elements analyzed are listed

in appendix 3.

Radon, Chlorofluorocarbons, and Stable 

Isotopes

Radon is a naturally occurring radioactive

element that produces a radioactive isotope, radon-222

(radon), as a gas. Radon is a by-product of the natural

decay of uranium that is present in small quantities in

certain rock and sediment types. Radon gas is soluble in

water and is transported in ground water. When radon

gas is exposed to air, as occurs when ground water is

pumped out of an aquifer and used for domestic

purposes, the radon diffuses into the air where it can be

inhaled (U.S. Environmental Protection Agency,

2002a). The USEPA recommends treating ground water

with radon concentrations greater than 300 pCi/L.

Radon concentrations in 9 of the 50 wells sampled

(table 3) were greater than the MCL of 300 pCi/L for

states without a Multimedia Mitigation Program, but

less than the alternate MCL of 4,000 pCi/L for states

with an Multimedia Mitigation Program (U.S.

Environmental Protection Agency, 2000). Radon

concentrations ranged from 27 to 1,320 pCi/L; the

median concentration was 225 pCi/L. Concentrations of

radon for wells sampled are listed in appendix 4.

Concentrations of chlorofluorocarbons, including CFC-11, CFC-113, and CFC-12, and concentrations

of stable isotopes of hydrogen (2H/1H) and oxygen

(

18O/16O) were determined in water from seven wells in

the Chicot aquifer system (appendix 4). CFC’s were

used to determine apparent age of water. The presence

of measurable concentrations of CFC’s in water from the

seven wells indicated the samples contained some post1940 water. Chemical processes, such as microbial

degradation and sorption during transit, and physical

processes such as mixing with older water, can affect the

concentration of CFC’s; thus the term “apparent” is used

to qualify the age term. The apparent age of water from

these wells ranged from 31 to 55 years (appendix 4),

possibly indicating ground water in these wells was

recharged in the late 1940’s or after.

Nutrients

Only four nutrient concentrations were greater

than 2 mg/L, a level that might indicate effects from

anthropogenic activities (Mueller and Helsel, 1996). Six

nutrient constituents analyzed and summary statistics for

these constituents are listed in table 3. Ammonia was

detected in 29 of 60 wells, and concentrations ranged

from 0.022 to 2.56 mg/L. Ammonia plus organic
17

nitrogen was detected in 25 of the 60 wells sampled, and

concentrations ranged from an estimated 0.05 to

2.7 mg/L. Nitrite plus nitrate was detected in 34 of 60

wells sampled, and concentrations ranged from an

estimated 0.028 to 2.3 mg/L. The median concentration

of nitrite plus nitrate was an estimated 0.034 mg/L.

Nitrite as nitrogen was detected in seven samples with a

median of <0.006 mg/L and maximum concentration of

0.017 mg/L. Concentrations of phosphorus and orthophosphate were detected in 50 and 48 wells,

respectively. Phosphorus concentrations ranged from an

estimated 0.004 to 0.88 mg/L, and orthophosphate

concentrations ranged from an estimated 0.011 to

0.8 mg/L. No USEPA drinking-water standards for

nutrients were exceeded in the wells sampled. Nutrient

concentrations are listed in appendix 5.

Dissolved Organic Carbon

Concentrations of DOC were detected in 51 of 60

wells sampled (table 3). Concentrations of DOC ranged

from an estimated 0.16 to 9.9 mg/L; the median

concentration was estimated at 0.30 mg/L. The amount

of organic carbon present in ground water can have a

substantial influence on microbial communities in an

aquifer and in turn affect the concentration of redoxsensitive species such as dissolved oxygen, trace

elements, and nutrients (Hem, 1985, p. 151-152).

According to Drever (1997, p. 107), DOC concentrations typically occur naturally in ground water at

concentrations of about 0.5 mg/L. The median concentration of estimated 0.30 mg/L indicated naturally

occurring DOC conditions in ground water in the study

area. Concentrations of DOC are listed in appendix 5.

Pesticides and Degradation Products

Pesticides and degradation products analyzed for

and detected are listed in table 4. Pesticides listed in

italics were analyzed by a new method (Furlong and

others, 2001). Although the analytical method did not

change following approval by the USGS in 2001, data

analyzed before method approval are considered

provisional. Of the 92 pesticides and 17 degradation

products analyzed, 8 pesticides and 2 degradation

products were detected in ground-water samples from 5

wells. Of the 10 compounds detected, only three

compounds were detected more than once: atrazine,

metolachlor, and deethylatrazine (fig. 5). Concentrations of all pesticides and degradation products were at

or less than 0.252 μg/L (table 5). Pesticides were

detected in four wells (fig. 6): one well had only one

compound detected, one well had only two compounds

detected, one well had three compounds detected, and

one well had five compounds detected. Degradation

products were detected in four wells, with only one

degradation product detected in each well. Atrazine was

the most frequently detected pesticide (three wells), with

a maximum concentration of 0.056 μg/L. Deethylatrazine, a degradation product of atrazine, was the most

frequently detected degradation product (three wells),

with a maximum concentration of an estimated 0.007

μg/L. Concentrations of pesticides are listed in

appendix 6, and concentrations of degradation products

are listed in appendix 7. Concentrations of all pesticides

were below USEPA drinking-water standards (table 5)

(U.S. Environmental Protection Agency, 2002b).

Volatile Organic Compounds

VOC’s analyzed for and detected are listed in

table 6. Twenty-four of the 85 VOC’s were detected in

the samples, and 12 of these compounds were detected

more than once (table 6; fig. 7). Only 7 VOC’s were

detected at concentrations greater than estimated (E).

Chloroform was the most frequently detected VOC (31

out of 60 wells) and had a maximum concentration of

1.6 μg/L. Carbon disulfide was the second most

frequently detected compound (8 samples) and had a

maximum concentration of 0.81 μg/L. Concentrations

of all VOC’s analyzed were at or less than 70 μg/L (table

5). VOC’s were detected in 44 of the wells sampled: 26

wells had only one compound detected; 11 wells had

only 2 compounds detected; 4 wells had 3 compounds

detected; one well had 4 compounds detected; one well

had 5 compounds detected; and one well had 11

compounds detected. Concentrations of all VOC’s were

below USEPA drinking-water standards (U.S.

Environmental Protection Agency, 2002b). VOC concentrations are listed in appendix 8.
Acetochlor

Acifluorfen

Aldicarb

Azinphos-methyl

Bendiocarb

Benfluralin

Benomyl

Bensulfuron methyl

Bentazon

Bromacil

Bromoxynil

Butylate

Carbofuran

Chloramben methyl ester

Chlorimuron

Chlorothalonil

Chlorpyrifos

Clopyralid

Cyanazine

Cycloate

Alachlor

Atrazine

Carbaryl

Aldicarb sulfone

Aldicarb sulfoxide

3-hydroxycarbofuran

DDE, p,p ́

Deethylatrazine

Deethyldeisopropylatrazine

Deisopropylatrazine

2,6-diethylaniline

Desulfinylfipronil

Fipronil RPA 105048

Fipronil sulfide

Fipronil sulfone

Degradation product

Parent compound

2-Hydroxyatrazine

3-Ketocarbofuran

Methomyl oxime

3 (4-chlorophenyl)-1-Methyl urea

Oxamyl oxime

2,4-D

Dacthal (DCPA)

Dacthal monoacid

2,4-DB

Dicamba

Dichlorprop

Dieldrin

Dinoseb

Diphenamid

Disulfoton

Diuron

2,4-D methyl ester

EPTC

Ethalfluralin

Ethopropos

Fenuron 

Fipronil

Flumetsulam

Fluometuron

Fonofos

HCH, alpha

Imazaquin

Diazinon

Imazethapyr

Imidacloprid

Lindane

Linuron

Malathion

MCPA

MCPB

Metalaxyl

Methiocarb

Methomyl

Methyl parathion

Metsulfuron methyl

Molinate

Napropamide

Neburon

Nicosulfuron

Norflurazon

Oryzalin

Oxamyl

Parathion

Pebulate

Metolachlor

Metribuzin

Pendimethalin

cis-Permethrin

Phorate

Prometon

Pronamide

Propachlor

Propanil

Propargite

Propham

Propiconazole

Propoxur

Siduron

Simazine

Sulfometuron methyl

Terbacil

Terbufos

Thiobencarb

Tri-allate

Tribenuron methyl

Triclopyr

Trifluralin

Picloram

Tebuthiuron

Table 4. Pesticides and degradation products analyzed for and detected in water from selected

domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001

Figure 5. Pesticides and degradation products detected in water from selected domestic wells in

southern Louisiana and southwestern Mississippi, 2000-2001.

[Pesticides in italics were analyzed before analytical method approval and are considered provisional.

Compounds in purple were detected.]

18

PESTICID

E

O

R

D

E

G

R

A

D

ATIO

N PR

O

D

U

CT

0.001

1 2

0.032

0.056

E 0.003

0.006

0.252

0.031

0.090

0.013

0.007

0.006

E

0 3

NUMBER OF DETECTIONS

Alachlor

Atrazine

Carbaryl

Diazinon

Metolachlor

Metribuzin

Picloram

Picloram

Tebuthiuron

DDE, p,p ́

Deethylatrazine

Pesticide

Degradation product

Maximum concentration,

in micrograms per liter

Estimated value

Pesticides in italics were

analyzed before analytical

method approval. and data

are considered provisional
19

Table 5. Summary statistics and Federal guidelines and standards for pesticides and degradation products 

and volatile organic compounds detected in water from selected domestic wells in southern Louisiana and 

southwestern Mississippi, 2000-2001

[All concentrations are in micrograms per liter. USEPA, U.S. Environmental Protection Agency; MCL, Maximum Contaminant Level; E, estimated; 

HA, Health Advisory; DP, degradation product; --, no value available; DWA, drinking water advisory]

Constituent

Number of 

detections/ 

samples

Analytical 

reporting 

level

Minimum 

detection

Maximum 

detection

Drinking 

water 

standard

Type of 

standard1

Number of 

wells 

exceeding 

USEPA 

drinkingwater 

standard

Pesticide

Alachlor 1/60 0.0045 0.032 0.032 2.0 MCL 0

Atrazine 3/60 .009 E.004 .056 3.0 MCL 0

Carbaryl 1/60 .028 E.003 E.003 700 HA 0

Diazinon 1/60 .005 .006 .006 .6 HA 0

Metolachlor 2/60 .013 .032 .252 100 HA 0

Metribuzin 1/60 .006 .031 .031 200 HA 0

Picloram 1/60 .019 .090 .090 500 MCL, HA 0

Tebuthiuron 1/60 .0062 .013 .013 500 HA 0

Degradation product

DDE, p,p ′ (DP of DDT) 1/60 .006 E.001 E.001 -- -- --

Deethylatrazine (DP of atrazine) 3/60 .002 E.002 E.007 -- -- --

Volatile organic compound

Benzene 3/60 .021 E.01 E.04 5.0 MCL 0

Bromodichloromethane 2/60 .048 E.02 E.06 8.0 MCL 0

Carbon disulfide 8/60 .07 E.02 .81 -- -- --

Chloroform 31/60 .024 E.01 1.60 80 MCL 0

Chloromethane 

 (Methyl chloride)

1/60 .17 E.10 E.10 3.0 HA 0

1,4-Dichlorobenzene 1/60 .050 E.01 E.01 75.0 MCL 0

Dichlorodifluoromethane 2/60 .18 E.20 E.30 1,000 HA 0

Dichloromethane

 (Methylene chloride)

2/60 .16 E.04 E.10 5.0 MCL 0

Ethylbenzene 1/60 .030 E.04 E.04 700 MCL 0

o-Ethyl toluene 1/60 .06 E.02 E.02 -- -- 0

MTBE (Methyl tert-butyl ether) 2/60 .17 .30 .40 40 (taste)

20 (odor)

DWA 0

2-Butanone (Methyl ethyl keton) 1/60 5.0 70 70 4,000 HA 0

tert-Pentyl methyl ether 1/60 .08 E.03 E.03 -- -- --

Naphthalene 1/60 .5 .3 .3 100 HA 0

Tetrahydrofuran 3/60 2.2 E 1.0 29 -- -- --

1,2,3,5-Tetramethylbenzene 

 (Isodurene)

1/60 .20 E.02 E.02 -- -- --

Trichloroethylene (TCE) 5/60 .038 E.02 .11 5.0 MCL 0

Trichlorofluoromethane 1/60 .09 E 1.33 E 1.33 2,000 HA 0

1,2,3-Trimethylbenzene 1/60 .12 E.02 E.02 -- -- --

1,2,4-Trimethylbenzene 2/60 .056 E.02 E.10 -- -- --

1,3,5-Trimethylbenzene 1/60 .044 E.02 E.02 -- -- --

Toluene 5/60 .05 E.01 E.07 1,000 MCL, HA 0

m- and p-Xylene 1/60 .06 E.01 E.12 10,000 MCL, HA 0

o-Xylene 2/60 .07 E.06 E.06 10,000 MCL, HA 0

1

U.S. Environmental Protection Agency (2002b).

Acetone (2-propanone)

Acrylonitrile (2-Propenenitrile)

Bromobenzene

Bromochloromethane

Bromoethene (Vinyl bromide)

Bromoform

Bromomethane (Methyl bromide)

Butylbenzene 

sec-Butylbenzene 

tert-Butylbenzene

Chlorobenzene 

Chloroethane 

3-Chloropropene

2-Chlorotoluene 

4-Chlorotoluene 

Dibromochloromethane

1,2-Dibromo-3-chloropropane

1,2-Dibromoethane

Dibromomethane

1,2-Dichlorobenzene

1,3-Dichlorobenzene

trans-1,4-Dichloro-2-butene

Benzene

Bromodichloromethane

Carbon disulfide 

Chloroform (Trichloromethane)

Chloromethane (Methyl chloride)

1,4-Dichlorobenzene

Dichlorodifluoromethane

1,1-Dichloroethane

1,2-Dichloroethane

1,1-Dichloroethylene

cis-1,2-Dichloroethylene

trans-1,2-Dichloroethylene

1,2-Dichloropropane

1,3-Dichloropropane

1,2-Dichloropropane

Dichloropropane

cis-1,3-Dichloropropene

trans-1,3-Dichloropropene

Diethyl ether

Diisopropyl ether 

Ethyl tert-butyl ether (ETBE)

Ethyl methacrylate

Hexachlorobutadiene

Hexachloroethane

2-Hexanone

Isopropylbenzene

4-Isopropyl-1-methylbenzene 

 (p-Isopropyltoluene)

Methyl acrylate 

Methyl acrylonitrile

Dichloromethane (Methylene chloride)

Ethylbenzene

o-Ethyl toluene

Methyl tert-butyl ether (MTBE)

2-Butanone (Methyl ethyl keton)

2,2-

1,1-Dichloropropene

Methyl iodide (Iodomethane)

4-Methyl-2-pentanone (Methyl isobutyl ketone)

Methyl methacrylate

n-Propylbenzene 

Styrene (Ethenyl-benzene)

1,1,1,2-Tetrachloroethane

1,1,2,2-Tetrachloroethane

Tetrachloroethylene

Tetrachloromethane

1,2,3,4-Tetramethylbenzene (Prehnitene)

1,2,3-Trichlorobenzene

1,2,4-Trichlorobenzene

1,1,1-Trichloroethane

1,1,2-Trichloroethane

1,2,3-Trichloropropane

1,1,2-Trichlorotrifluoroethane (Freon 113)

Vinyl chloride

tert-Pentyl methyl ether

Naphthalene

Tetrahydrofuran

1,2,3,5-Tetramethylbenzene (Isodurene)

Trichloroethylene (TCE)

Trichlorofluoromethane

1,2,3-Trimethylbenzene

1,2,4-Trimethylbenzene

1,3,5-Trimethylbenzene

Toluene

m- and p-Xylene

o-Xylene

Volatile Organic Compounds

Table 6. Volatile organic compounds analyed for and detected in water from selected domestic wells

in southern Louisiana and southwestern Mississippi, 2000-2001

Figure 7. Volatile organic compounds detected in water from selected domestic wells in southern

Louisiana and southwestern Mississippi, 2000-2001.

[Compounds in purple were detected.]

21

0.81

E

E.04

E.06

0.81

E.04

1.6

E.1

E.01

E0.3

E0.1

E.02

29

0.4

70

E.03

0.3

E.02

0.11

E1.33

E.02

E.12

E.10

E.02

E.07

E.06

Benzene

Bromodichloromethane

Carbon disulfide

Chloroform (Trichloromethane)

Chloromethane (Methyl chloride)

1,4-Dichlorobenzene

Dichlorodifluoromethane

Dichloromethane (Methylene chloride)

Ethylbenzene

o-Ethyl toluene

Methyl tert-butyl ether (MTBE)

2-Butanone (Methyl ethyl keton)

tert-Pentyl methyl ether

Naphthalene

Tetrahydrofuran

1,2,3,5-Tetramethylbenzene (Isodurene)

Trichloroethylene (TCE)

Trichlorofluoromethane

Toluene

1,2,3-Trimethylbenzene

1,2,4-Trimethylbenzene

1,3,5-Trimethylbenzene

m- and p-Xylene

Volatile organic compound

Maximum concentration,

in micrograms per liter

Estimated value

o-Xylene

NUMBER OF DETECTIONS

V

O

L

ATIL

E

O

R

G

A

NIC

C

O

M

P

O

U

N

D

0 5 10 15 20 25 30
22

STATISTICAL ANALYSIS OF GROUNDWATER-QUALITY DATA

Correlation Between Depth to Top of 

Screen and Selected Physicochemical 

Properties and Chemical Constituents

Correlations listed in table 7 indicate relations

between depth to top of screen and the selected

physicochemical properties and chemical constituents in

ground water in southern Louisiana and southwestern

Mississippi. Depth to top of screen was weakly correlated

to the number of pesticides detected. This relation was

inversely correlated, indicating that more pesticides were

detected in shallower wells than in deeper wells. Little to

no correlation was detected between depth to top of

screen and number of VOC’s. Depth to top of screen was

weakly correlated to specific conductance, dissolved

solids, calcium, sodium, bicarbonate, and sulfate; and

depth to top of screen was moderately correlated to pH,

potassium, silica, barium, and strontium. These relations

were positively correlated, indicating that deeper wells

generally had higher concentrations of selected chemical

constituents. There was little or no correlation between

depth to top of screen and radon.

Comparison Between Depth to Top of 

Screen and Selected Physicochemical 

Properties and Chemical Constituents in 

the Chicot Aquifer System and the Chicot 

Equivalent Aquifer System

Chemistry of water in CH wells was significantly

different from that in CHE wells for most of the compared

constituents (fig. 8). Values of specific conductance, pH,

calcium, sodium, bicarbonate, chloride, dissolved solids,

and iron were typically greater in CH wells than in CHE

wells. There were no significant differences in depth to

top of screen and radon between CH and CHE wells.

Though these two groups had similar physical properties,

such as depth to top of screen, ground water in these areas

appeared to be chemically different. The differences

between the two groups of wells might be due to the

spatial distribution of wells. Fewer wells were located in

the outcrop area of the Chicot aquifer system in

southwestern Louisiana than in the outcrop area of the

Southern Hills regional aquifer system in southeastern

Louisiana and southwestern Mississippi. 

Chemistry of water in CHO wells was

significantly different from CHS wells for all constituents

except radon. Depth to top of screen and values of

specific conductance, pH, calcium, sodium, bicarbonate,

Table 7. Results of Spearman rank correlation test between depth to top of screen and selected physicochemical

properties and chemical constituents in water from selected domestic wells in southern Louisiana and southwestern

Mississippi, 2000-2001 

[-, inversely correlated; VOC’s, volatile organic compounds; <, less than] 

Variables

Depth to top of screened interval and indicated 

physicochemical property or chemical constituent:

Number of 

sample pairs

Probability,

statistic

Correlation 

coefficient

Number of pesticides detected 58 0.034 - 0.28

Top of screened interval and number of VOC’s detected 58 .404 -.11

Specific conductance 58 .004 .37

pH 58 .002 .41

Dissolved solids 56 .007 .36

Calcium 58 .008 .35

Sodium 58 .003 .38

Potassium 58 <.001 .46

Bicarbonate 58 .004 .37

Sulfate 58 .047 .26

Silica 58 <.001 .52

Barium 58 .001 .42

Strontium 58 .001 .42

Radon 48 .690 .06

24

chloride, dissolved solids, and iron were lower in CHO

wells than in CHS wells (fig. 9). Chemistry of water in

CHEO wells was significantly different from CHES wells

for all constituents except chloride and radon. Depth to

top of screen and values of specific conductance, pH,

calcium, sodium, bicarbonate, dissolved solids, and iron

were less in CHEO wells than in CHES wells. Groundwater movement is generally to the south in the Chicot

aquifer system in southwestern Louisiana (Harder and

others, 1967), and south to southwest in the Chicot

equivalent aquifer system in southeastern Louisiana and

southwestern Mississippi (Buono, 1983). The increase in

concentrations of many of the selected physicochemical

and chemical constituents south of the outcrop areas of

the Chicot and Chicot equivalent aquifer systems are

considered normal, because dissolved solids and other

constituents generally increase along ground-water flow

paths (Nyman, 1989). As water moves through an aquifer

system, acidic waters react with aquifer materials, thus

increasing the concentrations of dissolved ions down

gradient. Depth to top of screen, specific conductance,

dissolved solids, calcium, chloride, sodium, and iron

were not significantly different between CHO and CHEO

wells (fig. 9). Values for pH and bicarbonate were higher

in CHO wells, and radon was higher in CHEO wells.

Depth to top of screen, pH, specific conductance,

bicarbonate, dissolved solids, sodium, iron, and radon

were not significantly different between CHS and CHES

wells. Calcium and chloride were higher in CHS wells

than in CHES wells. Though the chemistry of water from

wells in the Chicot aquifer system appeared to be

different from the chemistry of water from wells in the

Chicot equivalent aquifer system, similarities existed

between the chemistry of water from wells in the outcrop

areas and areas south of the outcrop areas. The lack of

significant differences between CHO and CHEO wells,

the lack of significant differences between CHS and

CHES wells, the statistical differences between CHO

wells and CHS wells, and the statistical differences

between CHEO and CHES wells, indicated that

chemistry of water in a well is influenced by the location

of the well relative to the outcrop area.

SUMMARY AND CONCLUSIONS

 In 2000-2001, water-quality data were collected

from 60 randomly selected domestic wells in the

Acadian-Pontchartrain Study Unit, as part of the National

Water-Quality Assessment Program. The data were

collected and analyzed to (1) describe the quality of water

in wells that are screened in major aquifer systems and

used for domestic supply and (2) relate that water quality

to natural and anthropogenic factors in southern

Louisiana and southwestern Mississippi. The wells were

screened in shallow sands (less than 350 feet below land

surface) in two major aquifer systems--the Chicot aquifer

system in southwestern Louisiana and the Chicot

equivalent aquifer system in southeastern Louisiana and

southwestern Mississippi. The Chicot equivalent aquifer

system is part of the Southern Hills regional aquifer

system, and both the Chicot aquifer system and the

Southern Hills regional aquifer systems are designated as

sole-source aquifers by the U.S. Environmental

Protection Agency (USEPA). 

The well depths ranged from 40 to 340 feet, with a

median depth of 120 feet. The ground-water-quality data

included 5 physicochemical properties, dissolved solids,

9 major inorganic ions, 24 trace elements, 6 nutrients,

dissolved organic carbon, 109 pesticides and degradation

products, and 85 volatile organic compounds (VOC’s);

and a subset of the wells were sampled for radon,

chlorofluorocarbons, and stable isotopes. 

Quality-control samples, including field-blank

samples, replicate environmental samples, and field- and

laboratory-spiked samples, were collected to test samplecollection procedures, sample processing, and laboratory

analyses. Few water-quality constituents analyzed were

detected in the field-blank samples, indicating cleaning

and sampling procedures were adequate to prevent onsite and site-to-site contamination. Variance between the

environmental samples and the corresponding replicate

samples was typically less than 5 percent, indicating an

acceptable degree of laboratory precision and data

collection reproducibility. Mean recovery of pesticides

and volatile organic compounds from spiked samples

ranged from 72 to 119 percent and were within laboratory

control limits.

Water from 35 of the 60 wells sampled had pH

values less than the USEPA Secondary Maximum

Contaminant Level (SMCL) range of 6.5 to 8.5 standard

units. Specific conductance ranged from 17 to

1,420 microsiemens per centimeter at 25 degrees Celsius.

The alkalinity as calcium carbonate ranged from 4.0 to

360 mg/L (milligrams per liter). Values for specific

conductance, pH, and alkalinity were typical for the

Chicot and the Chicot equivalent aquifer systems. 

Dissolved-solids concentrations ranged from

16 to 858 mg/L. Only two wells had dissolved-solids

concentrations greater than the SMCL of 500 mg/L.

Major inorganic ions were the primary constituents of

dissolved solids in ground-water samples. Sodium (50

wells) and calcium (10 wells) were the dominant cations,

and bicarbonate (44 wells) and chloride (16 wells) were

the dominant anions. The chloride concentration

(264 mg/L) in water sampled from one well exceeded the

SMCL of 250 mg/L. 

26

Concentrations of all 24 trace elements analyzed,

except one iron value, were less than 1,000 μg/L (micrograms per liter). Iron exceeded the SMCL of 300 μg/L in

samples from 22 wells and had a maximum concentration

of 8,670 μg/L. One sample of arsenic (55.3 μg/L)

exceeded the USEPA Maximum Contaminant Level

(MCL) of 10 μg/L. Water from one well had an aluminum

concentration of 77 μg/L and was within the SMCL of 50

to 200 μg/L. Manganese exceeded the SMCL of 50 μg/L

in samples from 26 wells and had a maximum

concentration of 481 μg/L. Health Advisories have been

established for six of the trace elements analyzed; no

concentrations were greater than these nonenforceable

standards. The USEPA recommends treating ground

water with radon concentrations greater than 300 picocuries per liter (pCi/L). Concentrations of radon ranged

from 27 to 1,320 pCi/L, and 9 of the 50 wells sampled

were greater than the MCL of 300 pCi/L, but less than the

alternate MCL of 4,000 pCi/L. 

Concentrations of ammonia, ammonia plus

organic nitrogen, and nitrite plus nitrate in water from

four wells were greater than 2 mg/L, a level that might

indicate effects from anthropogenic activities. Concentrations of ammonia ranged from 0.022 to 2.56 mg/L.

Concentrations of ammonia plus organic nitrogen ranged

from an estimated 0.05 to 2.7 mg/L. Concentrations of

nitrite plus nitrate ranged from an estimated 0.028 to

2.3 mg/L. Nitrite as nitrogen was detected in only seven

samples and had a maximum concentration of

0.017 mg/L. Concentrations of phosphorus and orthophosphate ranged from an estimated 0.004 to 0.88 mg/L.

No nutrient concentration exceeded USEPA drinkingwater standards in the wells sampled. 

Concentrations of dissolved organic carbon

(DOC) ranged from an estimated 0.16 to 9.9 mg/L. DOC

typically occurs naturally in ground water at

concentrations of about 0.5 mg/L or less. The median

concentration of DOC was an estimated 0.30 mg/L,

which indicated naturally occurring DOC conditions in

ground water in the study area.

Concentrations of all 92 pesticides analyzed were

below USEPA drinking-water standards, and concentrations of all 92 pesticides and 17 degradation products

were less than or equal to 0.252 μg/L. Only 8 pesticides

and 2 degradation products were detected in groundwater samples from five wells. Atrazine, its degradation

product deethylatrazine, and metolachlor were the most

frequently detected pesticides. Atrazine had a maximum

concentration of 0.056 μg/L, and deethylatrazine had a

maximum concentration of an estimated 0.007 μg/L. 

Concentrations of all 85 VOC’s analyzed were at

less than USEPA drinking-water standards and concentrations were less than or equal to 70 μg/L. Twenty-four

VOC’s were detected in ground-water samples, and only

seven VOC’s were detected at concentrations greater than

estimated values. Chloroform was the most frequently

detected VOC and had a maximum concentration of

1.6 μg/L. Carbon disulfide was the second most

frequently detected compound and had a maximum

concentration of 0.81 μg/L. 

Depth to top of screen was weakly correlated to

specific conductance, dissolved solids, calcium, sodium,

bicarbonate, and sulfate; and depth to top of screen was

moderately correlated to pH, potassium, silica, barium,

and strontium. These relations were positively correlated, indicating that deeper wells generally had higher

concentrations of the selected chemical constituents.

Depth to top of screen was inversely correlated to the

number of pesticides detected, indicating shallower wells

generally had more pesticides detected than deeper wells.

VOC’s were detected in 44 of the 60 wells sampled, most

of which had only one compound detected. There was

little to no correlation between depth to top of screen and

number of VOC’s detected. 

The Mann-Whitney rank-sum test was used to

compare depth to top of screen and selected physicochemical and chemical constituents between six groups

of wells. Five comparisons were made between the

groups. Values for the selected constituents were

typically greater in samples from wells located in the

Chicot aquifer system in southwestern Louisiana than in

samples from wells located in the Chicot equivalent

aquifer system in southeastern Louisiana and southwestern Mississippi. Values for specific conductance,

pH, calcium, sodium, bicarbonate, chloride, dissolved

solids, and iron were typically greater in wells located

south of the outcrop areas in the Chicot and Chicot

equivalent aquifer systems. The increase in concentrations of many of the selected physicochemical and

chemical constituents south of the outcrop areas of the

Chicot and Chicot equivalent aquifer systems are

considered normal because dissolved solids and other

constituents generally increase along ground-water flow

paths. Most constituents were not significantly different

between the two outcrop areas or the two areas south of

the outcrop areas. The lack of significant differences

between wells in the outcrop areas and the statistical

differences between wells in the outcrop areas and wells

south of the outcrop areas indicated that water quality in a

well is influenced by the location of the well relative to the

outcrop area.
27

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31

APPENDIXES

1. Physicochemical properties of water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001

2. Dissolved-solids and major inorganic ion concentrations in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001 

3. Trace-element concentrations in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001 

4. Radon, chlorofluorocarbons, and stable isotope concentrations in water from selected domestic wells in 

southern Louisiana and southwestern Mississippi, 2000-2001 

5. Nutrients and dissolved organic carbon concentrations in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001 

6 Pesticide concentrations in water from selected domestic wells in southern Louisiana and southwestern 

Mississippi, 2000-2001 

7. Concentrations of pesticide degradation products in water from selected domestic wells in southern 

Louisiana and southwestern Mississippi, 2000-2001 

8. Volatile organic compounds in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001 
32

ACAD 

well 

number

(fig. 1)

DOTD

local well

number

USGS site

identification

number

Sample date Specific 

conductance, field

(μS/cm)

Specific 

conductance, 

laboratory

(μS/cm)

pH, field

(standard

units)

pH, 

laboratory

(standard

units)

Air temperature

(oC)

Water temperature

(oC)

Alkalinity,

 incremental 

titration, field

(mg/L as CaCO3)

31 Be-6084Z 304409093171801 6-06-2000 82 86 6.4 6.7 29.0 22.7 28

32 Be-5928Z 304140093343502 6-07-2000 66 69 6.2 7.3 29.0 23.5 17

33 Be-6065Z 303153093303201 6-08-2000 105 110 6.3 6.6 27.0 21.5 31

34 Ev-5500Z 303550092252401 7-10-2000 1,220 1,210 7.2 7.2 40.0 22.2 257

35 JD-5177Z 301009092554501 7-18-2000 1,420 1,420 7.0 7.3 34.5 28.4 302

36 JD-5371Z 300627092464302 7-12-2000 763 750 7.3 7.5 31.0 23.5 214

37 Be-5764Z 305020093003001 7-19-2000 42 44 5.6 6.2 36.5 22.2 12

38 Ac-6896Z 300825092350001 7-21-2000 741 750 7.4 7.6 35.5 25.8 226

39 Be-6077Z 303626093161201 7-26-2000 158 158 6.1 6.5 -- 22.1 53

40 Al-5243Z 303647092573301 7-27-2000 45 48 5.7 6.1 31.0 25.0 15

41 Ve-7436Z 300718092125801 8-02-2000 686 686 7.2 7.4 34.0 25.2 339

42 Ve- 170 300121092005701 8-03-2000 300 277 6.9 6.8 34.0 21.9 138

43 Cu-7082Z 300816093280501 8-16-2000 408 411 8.1 8.1 36.5 22.0 200

44 V-8701Z 305810093034001 8-17-2000 23 25 5.9 6.2 32.0 22.0 4

45 Ve-9241Z 295640092144801 8-18-2000 739 729 6.8 7.4 35.5 21.7 360

46 Cn-5874Z 300111093101601 9-07-2000 537 533 7.6 8.0 26.5 23.4 222

47 SL-6924Z 303112092034001 9-11-2000 519 511 7.1 7.5 31.0 22.8 254

48 R-5964Z 305949092363001 9-19-2000 40 43 5.4 5.9 32.5 24.3 13

49 Ac-6998Z 302145092212501 9-26-2000 707 711 7.0 7.5 22.0 21.3 324

50 JD-5938Z 302109092523101 11-14-2000 297 293 6.5 6.9 17.5 21.7 99

51 Cu-7967Z 301707093223202 11-15-2000 298 295 6.9 7.0 15.0 19.1 113

52 Cu-7410Z 302108093405103 11-21-2000 -- 242 6.6 7.2 -- -- 102

53 Ac-6112Z 301947092320101 11-20-2000 -- 526 7.3 7.8 17.0 17.4 189

54 Lf-9803Z 301538092021301 11-29-2000 196 200 6.3 6.4 -- 14.0 52

55 Al-5167Z 304857092363601 12-12-2000 264 289 8.0 7.3 11.6 16.0 79

56 Al-5506Z 304128092450401 12-14-2000 95 52 6.7 7.2 8.0 16.7 13

57 Ac-6512Z 302121092310201 1-10-2001 464 525 7.4 7.6 6.5 20.1 196

58 Ev-5508Z 305150092213101 1-11-2001 120 129 6.1 6.3 -- -- 50

59 Cu-5250Z 302403093084601 1-18-2001 442 445 7.1 7.2 13.0 19.5 174

60 Al-5240Z 303947092534101 2-06-2001 63 57 5.5 5.8 29.0 21.8 10

Appendix 1. Physicochemical properties of water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001

[ACAD, Acadian-Pontchartrain Study Unit of the National Water Quality Assessment Program; DOTD, Louisiana Department of Transportation and Development; USGS, U.S. Geological 

Survey; μS/cm, microsiemens per centimeter; oC, degrees Celsius; mg/L, milligrams per liter;--, no data] 
33

Appendix 1. Physicochemical properties of water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001—Continued

ACAD 

well 

number

(fig. 1)

DOTD

local well

number

USGS site

identification

number

Sample date Specific 

conductance, field

(μS/cm)

Specific 

conductance, 

laboratory

(μS/cm)

pH, field

(standard

units)

pH, 

laboratory

(standard

units)

Air temperature

(oC)

Water temperature

(oC)

Alkalinity,

 incremental 

titration, field

(mg/L as CaCO3)

61 SH-5527Z 305840090393801 2-14-2001 31 37 5.3 5.5 23.0 20.8 4

62 SH-5460Z 304727090392001 2-15-2001 28 32 5.1 5.8 28.0 20.8 7

63 EF-5282Z 305130091025701 3-01-2001 101 102 5.6 5.8 19.0 20.2 11

64 EF-5422Z 305834091033701 5-09-2001 42 41 5.2 5.7 -- 22.1 8

65 ST-6753Z 303032090051701 5-10-2001 61 62 5.5 6.0 32.5 21.6 20

66 ST-8617Z 303623090071601 5-24-2001 29 29 5.3 6.1 25.5 19.5 6

67 EB-6257Z 304118091055201 6-04-2001 135 150 5.9 7.3 26.0 23.1 44

68 EF-5348Z 305808091101701 6-14-2001 93 99 6.4 6.5 31.0 -- 33

69 EF-5450Z 304811091130701 6-28-2001 51 50 5.1 6.3 -- 24.1 8

70 Li-7429Z 303506090554101 6-14-2001 78 -- 5.6 6.0 30.0 20.5 18

71 Li-7282Z 303026090420301 6-20-2001 492 147 6.0 6.7 28.6 22.0 57

72 Ta-8435Z 303506090184101 6-21-2001 35 35 5.0 5.7 28.5 23.3 6

73 SH-5344Z 304001090390101 6-27-2001 143 143 5.5 7.2 26.9 21.0 33

74 Li-7148Z 302608090534101 7-12-2001 546 541 6.6 7.3 28.3 22.7 159

75 Ta-7292Z 302711090211801 7-19-2001 252 248 7.2 7.8 31.8 24.2 111

76 Ta- 788 303728090294301 8-02-2001 95 93 4.9 5.6 26.2 20.7 7

77 Wa-7324Z 305908090140901 7-26-2001 20 21 4.8 6.8 27.8 19.0 3

78 MS.AM-D016 311613090392001 8-07-2001 25 28 4.7 5.6 29.2 21.3 6

79 MS.PK-G021 310722090280801 8-08-2001 36 38 5.3 6.2 28.6 21.6 13

80 ST-6940Z 302725090094101 8-09-2001 136 146 6.2 6.8 27.4 21.5 54

81 Ta-9622Z 304636090303601 8-16-2001 28 31 4.7 5.6 31.9 22.7 4

82 EF-5228Z 304727090513901 9-11-2001 45 54 5.0 6.2 31.1 21.2 10

83 Ta- 815 305750090301101 9-19-2001 92 93 5.1 5.5 33.0 23.6 8

84 Ta-6551Z 304707090173301 9-20-2001 17 18 4.8 5.7 34.0 20.0 2

85 Li-6487Z 301959090504201 9-21-2001 298 295 7.3 8.0 35.0 24.5 14

86 EB-8065Z 302119090550802 9-25-2001 707 710 7.2 7.6 28.0 21.8 346

87 Li-6203Z 302049090390401 9-25-2001 497 499 7.6 7.7 25.0 21.3 246

88 WF-5115Z 305013091194001 9-26-2001 124 132 4.9 6.0 27.0 20.4 15

89 Ta-7401Z 302934090321901 9-27-2001 200 199 6.7 7.0 30.0 21.5 93

90 MS.AM-M006 310700090520001 9-28-2001 34 34 5.1 5.9 26.0 21.9 6
34

Appendix 2. Ground water quality data for shallow domestic wells located in southeastern Louisiana--trace elements .

ACAD 

well 

number

(fig. 1)

DOTD

local well

number

USGS site 

identification 

number

Sample date Dissolved 

residue at 

180o

C

(mg/L)

no CAS 

number

Calcium

(mg/L as Ca)

7440-70-2

Magnesium

(mg/L as Mg)

7439-95-4

Sodium

(mg/L as 

Na)

7440-23-5

Potassium

(mg/L as K)

7440-09-7

Bicarbonate

(mg/L as 

HCO3)

Sulfate

(mg/L as 

SO4)

14808-79-8

Chloride

(mg/L as Cl)

16887-00-6

Fluoride

(mg/L as F)

16984-48-8

Bromide

(mg/L as Br)

24959-67-9

Silica

(mg/L as 

SiO2)

7631-86-9

31 Be-6084Z 304409093171801 6-06-2000 91 3.5 1.3 11 1.6 34 2.8 6.8 <0.1 0.03 52

32 Be-5928Z 304140093343502 6-07-2000 71 3.5 .9 6.7 1.5 20 5.5 4.3 <.1 .02 33

33 Be-6065Z 303153093303201 6-08-2000 123 4.4 1.5 14 2.4 38 2.0 8.2 <.1 .03 60

34 Ev-5500Z 303550092252401 7-10-2000 704 80 32 106 1.3 329 2.7 227 .3 1.10 25

35 JD-5177Z 301009092554501 7-18-2000 858 129 40 76 1.7 368 24 264 .4 1.06 24

36 JD-5371Z 300627092464302 7-12-2000 440 60 17 63 1.7 261 5.8 107 .2 .39 42

37 Be-5764Z 305020093003001 7-19-2000 47 1.8 .5 4.3 1.6 15 .4 2.7 <.1 .03 28

38 Ac-6896Z 300825092350001 7-21-2000 422 43 12 90 2.2 276 <.3 101 .2 .18 34

39 Be-6077Z 303626093161201 7-26-2000 141 9.0 3.4 14 2.0 65 4.9 11 .2 .11 62

40 Al-5243Z 303647092573301 7-27-2000 53 1.9 .7 5.1 .9 18 .9 4.0 <.1 .02 30

41 Ve-7436Z 300718092125801 8-02-2000 401 54 22 54 2.9 414 E.2 18 <.1 .02 34

42 Ve- 170 300121092005701 8-03-2000 201 24 8.9 19 1.3 168 <.3 4.2 .2 .26 47

43 Cu-7082Z 300816093280501 8-16-2000 240 17 5.2 67 1.2 244 <.3 11 <.1 .02 18

44 V-8701Z 305810093034001 8-17-2000 29 .8 .5 2.0 .9 5 .4 3.3 <.1 .01 15

45 Ve-9241Z 295640092144801 8-18-2000 442 49 14 93 1.6 439 E.2 32 .2 .06 37

46 Cn-5874Z 300111093101601 9-07-2000 313 20 6.5 91 1.3 271 E.2 32 .1 .06 23

47 SL-6924Z 303112092034001 9-11-2000 300 54 18 23 1.6 310 <.3 16 .2 .08 35

48 R-5964Z 305949092363001 9-19-2000 46 1.3 .7 4.8 1.2 16 .4 4.1 <.1 .02 24

49 Ac-6998Z 302145092212501 9-26-2000 410 59 19 60 2.2 395 <.3 35 .2 .09 36

50 JD-5938Z 302109092523101 11-14-2000 198 13 5.6 38 1.5 121 2.8 29 .3 .32 54

51 Cu-7967Z 301707093223202 11-15-2000 200 20 7.3 26 2.2 138 2.8 22 .2 .39 55

52 Cu-7410Z 302108093405103 11-21-2000 182 18 5.5 22 1.6 124 3.0 13 .2 .28 54

53 Ac-6112Z 301947092320101 11-20-2000 317 42 9.6 49 1.4 231 <.1 50 .2 .19 42

54 Lf-9803Z 301538092021301 11-29-2000 152 16 4.4 15 1.4 63 7.3 20 .3 .13 46

55 Al-5167Z 304857092363601 12-12-2000 204 19 7.0 26 1.5 96 3.6 31 E.2 .17 50

56 Al-5506Z 304128092450401 12-14-2000 47 2.9 1.0 4.6 1.0 16 .3 4.6 <.2 .02 23

57 Ac-6512Z 302121092310201 1-10-2001 306 45 11 47 1.5 239 <.1 49 E.2 .19 42

58 Ev-5508Z 305150092213101 1-11-2001 108 7.7 2.5 14 .7 62 .6 8.3 E.1 .03 47

59 Cu-5250Z 302403093084601 1-18-2001 266 30 12 46 1.7 212 5.2 34 .2 .14 38

60 Al-5240Z 303947092534101 2-06-2001 68 2.6 .7 5.4 1.6 13 2.2 6.2 <.2 .03 26

Appendix 2. Dissolved-solids and major inorganic ion concentrations in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 

2000-2001

[Numbers below the chemical names are the Chemical Abstracts Service (CAS) numbers. ACAD, Acadian-Pontchartrain Study Unit of the National Water Quality Assessment Program; 

DOTD, Louisiana Department of Transportation and Development; USGS, U.S. Geological Survey; oC, temperature in degrees Celsius; mg/L, milligrams per liter; E, estimated; <, less than; --, no data]
35

ACAD 

well 

number

(fig. 1)

DOTD

local well

number

USGS site 

identification 

number

Sample date Dissolved 

residue at 

180o

C

(mg/L)

no CAS 

number

Calcium

(mg/L as Ca)

7440-70-2

Magnesium

(mg/L as Mg)

7439-95-4

Sodium

(mg/L as 

Na) 

7440-23-5

Potassium

(mg/L as K)

7440-09-7

Bicarbonate

(mg/L as 

HCO3)

Sulfate

(mg/L as 

SO4)

14808-79-8

Chloride

(mg/L as Cl)

16887-00-6

Fluoride

(mg/L as F)

16984-48-8

Bromide

(mg/L as Br)

24959-67-9

Silica

(mg/L as 

SiO2)

7631-86-9

61 SH-5527Z 305840090393801 2-14-2001 25 0.6 0.83 4.0 0.4 5 E0.1 5.2 <.2 0.03 9.8

62 SH-5460Z 304727090392001 2-15-2001 27 1.0 .44 3.7 .4 9 .4 4.3 <.2 .03 9.6

63 EF-5282Z 305130091025701 3-01-2001 73 2.1 .70 15 .6 14 1.3 17 <.2 .14 14

64 EF-5422Z 305834091033701 5-09-2001 41 1.3 .54 5.2 .7 10 .2 5.1 <.2 .02 15

65 ST-6753Z 303032090051701 5-10-2001 57 2.6 1.16 7.0 1.8 24 1.5 4.9 <.2 .03 21

66 ST-8617Z 303623090071601 5-24-2001 18 1.1 .56 3.0 E.1 7 .2 4.3 <.2 .02 9.0

67 EB-6257Z 304118091055201 6-04-2001 -- 7.5 2.99 17 2.0 54 1.1 18 E.1 .14 25

68 EF-5348Z 305808091101701 6-14-2001 108 7.4 2.06 7.5 2.4 40 .9 5.3 <.2 .03 55

69 EF-5450Z 304811091130701 6-28-2001 53 1.7 .62 6.0 .8 10 .8 5.8 <.2 .03 17

70 Li-7429Z 303506090554101 6-14-2001 74 2.3 1.26 6.2 2.2 21 3.0 4.5 <.2 .1 8.6

71 Li-7282Z 303026090420301 6-20-2001 129 10 3.34 11 3.6 69 6.0 5.1 E.1 .03 45

72 Ta-8435Z 303506090184101 6-21-2001 41 1.2 .54 4.1 .2 7 .2 5.2 <.2 .01 12

73 SH-5344Z 304001090390101 6-27-2001 86 3.3 1.35 23 .7 40 2.6 21 <.2 .11 10

74 Li-7148Z 302608090534101 7-12-2001 312 33 14 56 1.2 193 .2 66 .3 .28 24

75 Ta-7292Z 302711090211801 7-19-2001 172 2.7 .57 54 1.0 135 9.9 3.2 .3 .03 37

76 Ta- 788 303728090294301 8-02-2001 64 2.4 1.18 12 .8 9 20 16 <.2 .08 16

77 Wa-7324Z 305908090140901 7-26-2001 26 .5 .39 1.9 .3 4 .2 3.0 <.2 <.01 8.6

78 MS.AM-D016 311613090392001 8-07-2001 28 .7 .42 3.4 .5 7 .2 3.3 <.2 .05 11

79 MS.PK-G021 310722090280801 8-08-2001 51 1.9 .88 2.9 1.5 16 .4 2.7 <.2 .03 19

80 ST-6940Z 302725090094101 8-09-2001 148 7.0 2.12 20 2.5 66 4.1 6.7 <.2 .04 59

81 Ta-9622Z 304636090303601 8-16-2001 -- .9 .46 3.3 .2 5 .2 4.3 <.2 <.01 9.6

82 EF-5228Z 304727090513901 9-11-2001 31 1.8 .72 7.1 .5 12 .5 9.0 <.2 .05 12

83 Ta- 815 305750090301101 9-19-2001 62 2.8 1.17 11 1.2 10 .3 16 <.2 .07 14

84 Ta-6551Z 304707090173301 9-20-2001 16 .1 .29 2.0 .4 3 .1 2.6 <.2 .02 9.5

85 Li-6487Z 301959090504201 9-21-2001 199 13 4.56 45 1.8 18 3.5 6.3 E.1 .04 47

86 EB-8065Z 302119090550802 9-25-2001 406 32 11 111 1.9 422 <.1 22 .3 .11 24

87 Li-6203Z 302049090390401 9-25-2001 304 14 5.45 92 1.4 300 E.1 11 .5 .04 22

88 WF-5115Z 305013091194001 9-26-2001 88 5.0 1.89 15 1.2 18 2.4 23 <.2 .17 24

89 Ta-7401Z 302934090321901 9-27-2001 142 9.6 2.59 28 2.5 113 3.4 5.6 <.2 .07 49

90 MS.AM-M006 310700090520001 9-28-2001 26 1.2 .49 3.0 .6 8 .2 3.4 <.2 .04 13

Appendix 2. Dissolved-solids and major inorganic ion concentrations in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 

2000-2001—Continued
36

Appendix . Ground water quality data for shallow domestic wells located in southeastern Louisiana--trace elements .

ACAD 

well 

number

(fig. 1)

DOTD

local well

number

USGS site 

identification 

number

Sample date Aluminum

(μg/L as Al)

7429-90-5

Antimony

(μg/L as Sb)

7440-36-0

Arsenic

(μg/L as As)

7440-38-2

Barium

(μg/L as Ba)

7440-39-3

Beryllium

(μg/L as Be)

7440-41-7

Boron

(μg/L as B)

7440-42-8

31 Be-6084Z 304409093171801 6-06-2000 <1 <1.00 0.9 46 <1.00 13

32 Be-5928Z 304140093343502 6-07-2000 8 <1.00 E.5 31 <1.00 E11

33 Be-6065Z 303153093303201 6-08-2000 <7 <1.00 1.1 94 <1.00 13

34 Ev-5500Z 303550092252401 7-10-2000 3 <1.00 1.3 344 <1.00 45

35 JD-5177Z 301009092554501 7-18-2000 <1 <1.00 1.0 491 <1.00 48

36 JD-5371Z 300627092464302 7-12-2000 7 <1.00 <.9 301 <1.00 19

37 Be-5764Z 305020093003001 7-19-2000 <1 <1.00 <.9 60 <1.00 13

38 Ac-6896Z 300825092350001 7-21-2000 7 <1.00 E.5 587 <1.00 67

39 Be-6077Z 303626093161201 7-26-2000 5 <1.00 2.1 105 <1.00 19

40 Al-5243Z 303647092573301 7-27-2000 4 <1.00 <.9 23 <1.00 E10

41 Ve-7436Z 300718092125801 8-02-2000 <1 <1.00 <.9 345 <1.00 102

42 Ve-170 300121092005701 8-03-2000 <1 <1.00 7.7 282 <1.00 32

43 Cu-7082Z 300816093280501 8-16-2000 7 <1.00 1.0 139 <1.00 58

44 V-8701Z 305810093034001 8-17-2000 1 <1.00 <.9 28 <1.00 E10

45 Ve-9241Z 295640092144801 8-18-2000 <1 <1.00 55.3 104 <1.00 69

46 Cn-5874Z 300111093101601 9-07-2000 <1 <1.00 <.9 204 <1.00 66

47 SL-6924Z 303112092034001 9-11-2000 <1 <1.00 <.9 164 <1.00 44

48 R-5964Z 305949092363001 9-19-2000 <1 <1.00 <.9 32 <1.00 E9.0

49 Ac-6998Z 302145092212501 9-26-2000 <1 <1.00 <.9 396 <1.00 105

50 JD-5938Z 302109092523101 11-14-2000 <1 E.04 1.2 116 <.06 24

51 Cu-7967Z 301707093223202 11-15-2000 <1 .05 <.2. 171 <.06 23

52 Cu-7410Z 302108093405103 11-21-2000 <1 <.05 .5 134 <.06 24

53 Ac-6112Z 301947092320101 11-20-2000 <1 E.03 .4 281 <.06 57

54 Lf-9803Z 301538092021301 11-29-2000 <1 E.04 1.3 61 <.06 15

55 Al-5167Z 304857092363601 12-12-2000 <1 0.06 .2 121 <.06 17

56 Al-5506Z 304128092450401 12-14-2000 <1 <.05 E.1 47 E.03 14

57 Ac-6512Z 302121092310201 1-10-2001 <1 <.05 .3 282 <.06 51

58 Ev-5508Z 305150092213101 1-11-2001 <1 <.05 1.0 38 <.06 14

59 Cu-5250Z 302403093084601 1-18-2001 <1 <.05 .5 195 <.06 33

60 Al-5240Z 303947092534101 2-06-2001 <1 E.03 <.2 57 .37 13

Appendix 3. Trace-element concentrations in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001

[Numbers below the chemical names are the Chemical Abstracts Service (CAS) numbers. ACAD, Acadian-Pontchartrain Study Unit of the National Water Quality Assessment Program; 

DOTD, Louisiana Department of Transportation and Development; USGS, U.S. Geological Survey; μg/L, micrograms per liter; <, less than; E, estimated; --, no data; M, verified but not quantified]
37

Appendix 3. Trace-element concentrations in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 

2000-2001—Continued

ACAD 

well 

number

(fig. 1)

DOTD

local well

number

UUSGS site 

identification 

number

Sample date Aluminum

(μg/L as Al)

7429-90-5

Antimony

(μg/L as Sb)

7440-36-0

Arsenic

(μg/L as As)

7440-38-2

Barium

(μg/L as Ba)

7440-39-3

Beryllium

(μg/L as Be)

7440-41-7

Boron

(μg/L as B)

7440-42-8

61 SH-5527Z 305840090393801 2-14-2001 5 E0.04 <0.2 26 <0.06 15

62 SH-5460Z 304727090392001 2-15-2001 2 E.04 <.2 18 <.06 11

63 EF-5282Z 305130091025701 3-01-2001 <1 <.05 <.2 23 <.06 E5.0

64 EF-5422Z 305834091033701 5-09-2001 <1 <.05 <.2 23 <.06 7.0

65 ST-6753Z 303032090051701 5-10-2001 <1 <.05 E.2 44 <.06 9.0

66 ST-8617Z 303623090071601 5-24-2001 1 <.05 <.2 8 <.06 9.0

67 EB-6257Z 304118091055201 6-04-2001 <1 <.05 <.2 164 E.04 11

68 EF-5348Z 305808091101701 6-14-2001 1 <.05 1.6 101 <.06 11

69 EF-5450Z 304811091130701 6-28-2001 2 <.05 <.2 20 .06 11

70 Li-7429Z 303506090554101 6-14-2001 77 E.03 4.3 13 .08 24

71 Li-7282Z 303026090420301 6-20-2001 <1 <.05 E.2 246 <.06 10

72 Ta-8435Z 303506090184101 6-21-2001 1 E.04 <.2 12 E.04 8.0

73 SH-5344Z 304001090390101 6-27-2001 1 <.05 <.2 27 <.06 E7.0

74 Li-7148Z 302608090534101 7-12-2001 <1 <.05 1.1 227 <.06 41

75 Ta-7292Z 302711090211801 7-19-2001 <1 <.05 2.2 37 E.04 47

76 Ta- 788 303728090294301 8-02-2001 2 <.05 <.2 19 .09 12

77 Wa-7324Z 305908090140901 7-26-2001 1 <.05 <.2 8 <.06 8.2

78 MS.AM-D016 311613090392001 8-07-2001 <1 <.05 <.2 15 E.04 E6.0

79 MS.PK-G021 310722090280801 8-08-2001 <1 E.04 0.2 53 <.06 E7.0

80 ST-6940Z 302725090094101 8-09-2001 <1 <.05 0.5 123 <.06 18

81 Ta-9622Z 304636090303601 8-16-2001 1 E.04 <.2 11 <.06 E6.0

82 EF-5228Z 304727090513901 9-11-2001 1 E.03 <.2 20 E.06 11

83 Ta- 815 305750090301101 9-19-2001 <1 <.05 <.2 50 .06 12

84 Ta-6551Z 304707090173301 9-20-2001 2 <.05 <.2 9 <.06 10

85 Li-6487Z 301959090504201 9-21-2001 <1 <.05 E.1 145 <.06 32

86 EB-8065Z 302119090550802 9-25-2001 <1 <.05 4.4 233 <.06 114

87 Li-6203Z 302049090390401 9-25-2001 <1 <.05 6.6 170 <.06 177

88 WF-5115Z 305013091194001 9-26-2001 <1 <.05 <.2 49 <.06 13

89 Ta-7401Z 302934090321901 9-27-2001 <1 <.05 1.4 204 <.06 25

90 MS.AM-M006 310700090520001 9-28-2001 <1 <.05 <.2 14 <.06 E4.0
38

Appendix 3. Trace-element concentrations in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 

2000-2001—Continued

ACAD 

well 

number

(fig. 1)

Cadmium

(μg/L as Cd)

7440-43-9

Chromium

(μg/L as Cr)

740-47-3

Cobalt

(μg/L as Co)

7440-48-4

Copper

(μg/L as Cu)

7440-50-8

Iron

(μg/L as Fe)

7439-89-6

Lead

(μg/L as Pb)

7439-92-1

Lithium

 (μg/L as Li)

7439-93-2

Manganese

(μg/L as Mn)

7439-96-5

Mercury, total

(μg/L as Hg)

7439-37-6

31 <1.00 <0.8 <1.00 <1.0 <10 <1.00 5.9 <2.2 <0.3

32 <1.00 <.8 4.65 <1.0 560 <1.00 2.6 14 <.3

33 <1.00 <.8 <1.00 <1.0 70 <1.00 5.8 28 <.3

34 <1.00 <.8 <1.00 1.6 <10 <1.00 37 148 <.3

35 <1.00 <.8 <1.00 4.2 10 <1.00 26 130 <.3

36 <1.00 <.8 <1.00 <1.0 660 <1.00 23 325 <.3

37 <1.00 .9 <1.00 12 5.1 1.10 .8 <2.2 <.3

38 <1.00 <.8 <1.00 <1.0 1,160 <1.00 16 53 <.3

39 <1.00 <.8 <1.00 <1.0 1,440 <1.00 23 70 <.3

40 <1.00 E.7 <1.00 7.4 <10 <1.00 3.4 <2.2 <.3

41 <1.00 <.8 <1.00 <1.0 1,680 <1.00 12 94 <.3

42 <1.00 <.8 2.64 <1.0 8,670 <1.00 8.5 458 <.3

43 <1.00 <.8 <1.00 <1.0 40 <1.00 8.3 76 <.3

44 <1.00 <.8 <1.00 <1.0 <10 <1.00 1.5 <2.2 <.3

45 <1.00 <.8 <1.00 <1.0 1,540 <1.00 8.0 105 <.3

46 <1.00 <.8 <1.00 <1.0 100 <1.00 14 53 <.3

47 <1.00 <.8 <1.00 <1.0 2,180 <1.00 11 140 <.3

48 <1.00 1.1 <1.00 3.5 9.8 <1.00 1.7 E1.4 <.3

49 <1.00 <.8 <1.00 1.0 2,190 <1.00 20 90 <.3

50 <.04 <.8 .02 <.2 2,620 <.08 12 369 --

51 <.04 <.8 .03 E.2 2,810 E.05 18 289 --

52 <.04 E.4 .03 E.1 2,580 <.08 18 239 --

53 <.04 <.8 .11 .2 1,810 .26 14 154 --

54 .05 5.4 .04 .8 880 E.04 12 11 --

55 .07 <.8 .26 .3 70 <.08 13 481 --

56 E.03 1.9 .31 3.8 <10 .15 1.5 E2.2 --

57 <.04 <.8 .08 .3 1,790 <.08 12 131 --

58 .14 2.8 .03 7.2 9.0 .25 5.4 <3.2 --

59 <.04 <.8 .09 E.2 690 <.08 30 418 --

60 <.04 <.8 .68 22 150 .46 1.4 8.5 --
39

Appendix 3. Trace-element concentrations in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 

2000-2001—Continued

ACAD 

well 

number

(fig. 1)

Cadmium

(μg/L as Cd)

7440-43-9

Chromium

(μg/L as Cr)

740-47-3

Cobalt

(μg/L as Co)

7440-48-4

Copper

(μg/L as Cu)

7440-50-8

Iron

(μg/L as Fe)

7439-89-6

Lead

(μg/L as Pb)

7439-92-1

Lithium

 (μg/L as Li) 

7439-93-2

Manganese

(μg/L as Mn) 

7439-96-5

Mercury, total

(μg/L as Hg) 

7439-37-6

61 <0.04 <0.8 0.39 6.7 30 0.66 E0.3 E3.2 --

62 <.04 <.8 .08 5.3 <10 .45 .4 <3.0 --

63 <.04 <.8 .07 19 <10 1.76 .7 <3.2 --

64 <.04 <.8 .11 8.8 <10 .28 .7 E2.8 --

65 <.04 <.8 .02 8.4 <10 .52 2.5 <3.2 --

66 <.04 E.6 .09 4.6 <10 .48 .5 <3.0 --

67 <.04 E.8 .03 3.8 20 .32 1.2 <3.0 --

68 E.03 1.2 .02 34 E9.2 .32 5.4 <3.0 --

69 <.04 <.8 .11 9.0 <10 .77 .6 <3.0 --

70 <.04 1.1 .97 .3 3,170 .14 <.3 368 --

71 <.04 3.7 .02 6.1 E7.9 .87 <.3 <3.0 --

72 <.04 E.4 .14 18 10 .95 E.3 <3.0 --

73 <.04 <.8 .03 8.3 140 .91 E.2 <3.0 --

74 <.04 <.8 .08 .3 810 <.08 4.6 282 --

75 <.04 <.8 .03 E.1 70 <.08 14 36 --

76 E.03 1.3 .17 12 <10 .60 1.0 14 --

77 <.04 <.8 .05 2.0 <10 3.00 E.2 1.0 --

78 <.04 <.8 .07 19 80 1.52 E.3 5.2 --

79 <.04 E.7 .13 .3 <10 <.08 1.2 <3.0 --

80 <.04 <.8 .17 .7 90 .30 7.8 86 --

81 <.04 <.8 .08 4.3 <10 .22 E.2 <3.0 --

82 <.04 <.8 .04 55 10 3.52 .5 <3.0 --

83 <.04 <.8 .09 34 E6.0 2.12 .8 <3.0 --

84 .04 <.8 .17 3.5 E5.9 .55 .3 E1.6 --

85 <.04 <.8 .01 E.1 350 .11 27 218 --

86 E.02 <.8 .20 E.2 670 .24 8.6 74 --

87 E.02 <.8 .06 E.1 450 <.08 2.9 55 --

88 <.04 <.8 .08 2.6 <10 .23 1.3 <3.0 --

89 <.04 <.8 .02 E.2 700 <.08 8.0 182 --

90 <.04 <.8 .07 196 <10 5.33 .4 E1.0 --
40

Appendix 3. Trace-element concentrations in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 

2000-2001—Continued

ACAD 

well 

number

(fig. 1)

Molybdenum

(μg/L as Mo)

7439-98-7

Nickel

(μg/L as Ni)

7440-02-0

Selenium

(μg/L as Se)

7782-49-2

Silver

(μg/L as Ag)

7440-22-4

Strontium

(μg/L as Sr)

7440-24-6

Thallium

(μg/L as Tl)

7440-28-0

Vanadium

(μg/L as V)

7440-62-2

Zinc

(μg/L as Zn)

7440-66-6

Uranium

(μg/L as U)

7440-61-0

31 <1.0 2.84 3.7 <1.0 62 <0.90 <1.0 2 <1.00

32 <1.0 14 <.7 <1.0 59 <.90 <1.0 8 <1.00

33 <1.0 3.26 <.7 <1.0 87 <.90 <1.0 <5 <1.00

34 1.3 2.26 2.5 <1.0 356 <.90 1.4 16 1.27

35 2.6 3.09 7.2 <1.0 889 <.90 3.2 1 8.60

36 <1.0 <1.00 E.5 <1.0 235 <.90 <1.0 28 <1.00

37 <1.0 <1.00 <.7 <1.0 23 <.90 <1.0 4 <1.00

38 <1.0 3.00 E.5 <1.0 460 <.90 <1.0 4 <1.00

39 <1.0 2.87 <.7 <1.0 123 <.90 <1.0 101 <1.00

40 <1.0 <1.00 E.5 <1.0 28 <.90 <1.0 6 <1.00

41 <1.0 <1.00 <.7 <1.0 358 <.90 <1.0 <1 <1.00

42 <1.0 1.08 <.7 <1.0 90 <.90 <1.0 3 <1.00

43 3.4 <1.00 <.7 <1.0 204 <.90 <1.0 3 <1.00

44 <1.0 <1.00 <.7 <1.0 6.7 <.90 <1.0 2 <1.00

45 1.4 <1.00 <.7 <1.0 218 <.90 1.3 3 <1.00

46 2.7 <1.00 <.7 <1.0 231 <.90 <1.0 1 <1.00

47 <1.0 <1.00 <.7 <1.0 202 <.90 2.0 204 <1.00

48 <1.0 1.11 <.7 <1.0 17 <.90 <1.0 84 <1.00

49 <1.0 <1.00 <.7 <1.0 367 <.90 2.8 308 <1.00

50 .3 <.06 <.3 <1.0 70 <.04 .2 3 <.02

51 .3 <.06 <.3 <1.0 171 .45 E.2 2 <.02

52 .4 <.06 <.3 <1.0 144 <.04 <.2 3 <.02

53 .4 .07 <.3 <1.0 177 <.04 .5 112 <.02

54 .2 3.45 1.1 <1.0 83 <.04 3.4 5 <.02

55 E.1 1.10 <.3 <1.0 125 <.04 .6 2 .02

56 <.2 .71 <.3 <1.0 28 E.03 .3 3 E.02

57 .4 <.06 <.3 <1.0 179 <.04 1.0 7 <.02

58 <.2 1.11 E.3 <1.0 44 <.04 3.1 274 <.02

59 1.0 <.06 <.3 <1.0 243 <.04 2.1 9 <.02

60 <.2 2.23 .9 <1.0 28 <.04 .3 20 <.02
41

Appendix 3. Trace-element concentrations in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 

2000-2001—Continued

ACAD 

well 

number

(fig. 1)

Molybdenum

(μg/L as Mo)

7439-98-7

Nickel

(μg/L as Ni) 

7440-02-0

Selenium

(μg/L as Se)

7782-49-2

Silver

(μg/L as Ag)

7440-22-4

Strontium

(μg/L as Sr)

7440-24-6

Thallium

(μg/L as Tl)

7440-28-0

Vanadium

(μg/L as V)

7440-62-2

Zinc

(μg/L as Zn)

7440-66-6

Uranium

(μg/L as U)

7440-61-0

61 <0.2 0.52 <0.3 <1.0 8.4 <0.04 0.3 2 <0.02

62 <.2 .24 <.3 <1.0 5.3 <.04 .7 1 <.02

63 <.2 .26 E.3 <1.0 12 <.04 .8 3 .02

64 <.2 .32 <.3 <1.0 12 <.04 .7 1 E.02

65 <.2 .13 <.3 <1.0 36 <.04 .8 2 <.02

66 <.2 .16 <.3 <1.0 4.8 E.03 E.2 5 <.02

67 <.2 .63 <.3 <1.0 64 <.04 E.2 13 .04

68 <.2 .59 E.3 <1.0 87 <.04 1.4 136 .09

69 <.2 .37 <.3 <1.0 15 E.03 <.2 7 <.02

70 <.2 1.31 .4 <1.0 25 .05 4.8 2 .09

71 0.4 .34 .7 <1.0 190 E.03 4.1 585 .04

72 <.2 1.07 <.3 <1.0 4.4 <.04 <.2 11 <.02

73 <.2 .43 .4 <1.0 11 E.02 <.2 28 .02

74 1.0 <.06 <.3 <1.0 245 <.04 <.2 117 <.02

75 1.1 <.06 <.3 <1.0 41 <.04 <.2 <1 E.01

76 <.2 .91 .8 <1.0 17 <.04 <.2 22 .04

77 <.2 .09 E.2 <1.0 5.4 <.04 <.2 7 <.02

78 <.2 .22 <.3 <1.0 5.5 <.04 <.2 3 <.02

79 <.2 .99 <.3 <1.0 14 <.04 <.2 26 .04

80 0.2 .06 <.3 <1.0 132 <.04 <.2 2 <.02

81 <.2 .07 <.3 <1.0 5.2 <.04 <.2 2 <.02

82 <.2 .38 <.3 <1.0 8.5 <.04 <.2 8 .02

83 <.2 .81 <.3 <1.0 13.4 <.04 <.2 18 .02

84 <.2 .2 <.3 <1.0 2.8 E.04 <.2 2 E.01

85 <.2 <.06 <.3 <1.0 130 <.04 .4 23 <.02

86 7.6 <.06 <.3 <1.0 249 <.04 <.2 5 <.02

87 5.8 <.06 <.3 <1.0 115 .05 <.2 <1 <.02

88 <.2 .62 E.3 <1.0 28 <.04 <.2 1 .03

89 <.2 .10 <.3 <1.0 151 <.04 <.2 <1 <.02

90 <.2 .33 <.3 <1.0 5.9 <.04 <.2 13 <.02
42

ACAD

well 

number

(fig. 1)

DOTD

local well

number

USGS site

identification

number

Sample date Radon 222,

 total 

( pCi/L)

14859-67-7

Radon-222, 

2-sigma precision 

estimate 

(pCi/L)

CFC-11

trichlorofluoromethane 

(g/kg)

75-69-4

CFC-113 

trichlorotrifluoroethane

(g/kg) 

76-13-1

CFC-12 

dichlorodifluoromethane

(g/kg)

75-71-8

Apparent

 ground-water 

age 

(years)

Hydrogen,

 2 / 1 

ratio per mil,

no CAS number

Oxygen,

 18 / 16

ratio per mil,

no CAS number

31 Be-6084Z 304409093171801 6-06-2000 71 14 -- -- -- -- -- --

32 Be-5928Z 304140093343502 6-07-2000 100 33 -- -- -- -- -- --

33 Be-6065Z 303153093303201 6-08-2000 260 32 -- -- -- -- -- --

34 Ev-5500Z 303550092252401 7-10-2000 978 36 -- -- -- -- -- --

35 JD-5177Z 301009092554501 7-18-2000 1320 36 -- -- -- -- -- --

36 JD-5371Z 300627092464302 7-12-2000 479 30 -- -- -- -- -- --

37 Be-5764Z 305020093003001 12-13-2000 133 17 -- -- -- -- -- --

39 Be-6077Z 303626093161201 12-13-2000 32 15 -- -- -- -- -- --

39 Be-6077Z 303626093161201 4-03-2001 -- -- 30 5.4 50 31 -20.6 -4.2

40 Al-5243Z 303647092573301 2-01-2001 266 19 -- -- -- -- -- --

41 Ve-7436Z 300718092125801 8-02-2000 142 18 -- -- -- -- -- --

42 Ve- 170 300121092005701 8-03-2000 225 20 -- -- -- -- -- --

43 Cu-7082Z 300816093280501 8-16-2000 138 18 -- -- -- -- -- --

44 V-8701Z 305810093034001 8-17-2000 28 14 -- -- -- -- -- --

45 Ve-9241Z 295640092144801 8-18-2000 265 25 -- -- -- -- -- --

45 Ve-9241Z 295640092144801 3-09-2001 -- -- 0.7 0 2.3 55 -14.7 -3.55

46 Cn-5874Z 300111093101601 9-07-2000 203 17 -- -- -- -- -- --

47 SL-6924Z 303112092034001 9-11-2000 206 22 -- -- -- -- -- --

47 SL-6924Z 303112092034001 4-05-2001 -- -- 0.8 0 1.4 51 -16.4 -3.77

48 R-5964Z 305949092363001 9-19-2000 275 19 -- -- -- -- -- --

49 Ac-6998Z 302145092212501 9-26-2000 157 17 -- -- -- -- -- --

50 JD-5938Z 302109092523101 11-14-2000 157 17 -- -- -- -- -- --

50 JD-5938Z 302109092523101 3-06-2001 -- -- 0.2 0 0 51 -19.1 -3.9

51 Cu-7967Z 301707093223202 11-15-2000 236 19 -- -- -- -- -- --

51 Cu-7967Z 301707093223202 4-03-2001 -- -- 0.8 0 10 52 -18.4 -3.88

52 Cu-7410Z 302108093405103 11-21-2000 152 17 -- -- -- -- -- --

53 Ac-6112Z 301947092320101 11-20-2000 129 16 -- -- -- -- -- --

53 Ac-6112Z 301947092320101 3-07-2001 -- -- 2.7 0 5.7 51 -18.5 -3.87

54 Lf-9803Z 301538092021301 11-29-2000 290 19 -- -- -- -- -- --

54 Lf-9803Z 301538092021301 3-08-2001 -- -- 85 2.6 44 32 -19.8 -3.91

55 Al-5167Z 304857092363601 12-12-2000 27 14 -- -- -- -- -- --

Appendix 4. Radon, chlorofluorocarbons, and stable isotope concentrations in water from selected domestic wells in southern Louisiana and southwestern 

Mississippi, 2000-2001

[Numbers below the chemical names are the Chemical Abstracts Service (CAS) numbers. ACAD, Acadian-Pontchartrain Study Unit of the National Water Quality Assessment Program; DOTD, Louisiana Department 

of Transportation and Development; USGS, U.S. Geological Survey; pCi/L, picocuries per liter; g/kg, grams per kilogram; per mil, parts per thousand; --, no data; <, less than]
43

Appendix 4. Radon, chlorofluorocarbons, and stable isotope concentrations in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001—Continued

ACAD 

well

 number

(fig. 1)

DOTD

local well

number

USGS site

identification

number

Sample date Radon 222,

 total 

(pCi/L)

14859-67-7

Radon-222, 

2-sigma precision 

estimate 

( pCi/L)

CFC-11

trichlorofluoromethane 

(g/kg)

75-69-4

CFC-113 

trichlorotrifluoroethane

(g/kg) 

76-13-1

CFC-12 

dichlorodifluoromethane

(g/kg)

75-71-8

Apparent

 ground-water age 

(years)

Hydrogen,

 2 / 1 

 ratio per mil,

no CAS number

Oxygen,

 18 / 16

ratio per mil,

no CAS number

56 Al-5506Z 304128092450401 12-14-2000 31 14 -- -- -- -- -- --

57 Ac-6512Z 302121092310201 1-10-2001 134 17 -- -- -- -- -- --

58 Ev-5508Z 305150092213101 1-11-2001 339 23 -- -- -- -- -- --

59 Cu-5250Z 302403093084601 1-18-2001 257 19 -- -- -- -- -- --

60 Al-5240Z 303947092534101 2-06-2001 250 18 -- -- -- -- -- --

61 SH-5527Z 305840090393801 2-14-2001 142 16 -- -- -- -- -- --

62 SH-5460Z 304727090392001 2-15-2001 419 22 -- -- -- -- -- --

63 EF-5282Z 305130091025701 3-01-2001 586 24 -- -- -- -- -- --

64 EF-5422Z 305834091033701 5-09-2001 332 20 -- -- -- -- -- --

65 ST-6753Z 303032090051701 5-10-2001 264 18 -- -- -- -- -- --

66 ST-8617Z 303623090071601 5-24-2001 210 17 -- -- -- -- -- --

67 EB-6257Z 304118091055201 6-04-2001 206 18 -- -- -- -- -- --

68 EF-5348Z 305808091101701 6-14-2001 165 18 -- -- -- -- -- --

69 EF-5450Z 304811091130701 6-28-2001 255 20 -- -- -- -- -- --

70 Li-7429Z 303506090554101 6-21-2001 74 17 -- -- -- -- -- --

71 Li-7282Z 303026090420301 6-20-2001 329 22 -- -- -- -- -- --

72 Ta-8435Z 303506090184101 6-21-2001 255 21 -- -- -- -- -- --

73 SH-5344Z 304001090390101 6-27-2001 274 20 -- -- -- -- -- --

74 Li-7148Z 302608090534101 7-12-2001 152 18 -- -- -- -- -- --

75 Ta-7292Z 302711090211801 7-19-2001 274 19 -- -- -- -- -- --

76 Ta- 788 303728090294301 8-02-2001 <30 18 -- -- -- -- -- --

77 Wa-7324Z 305908090140901 7-26-2001 195 18 -- -- -- -- -- --

78 MS.AM-D016 311613090392001 8-07-2001 205 20 -- -- -- -- -- --

79 MS.PK-G021 310722090280801 8-08-2001 298 20 -- -- -- -- -- --

80 ST-6940Z 302725090094101 8-09-2001 125 20 -- -- -- -- -- --

81 Ta-9622Z 304636090303601 8-16-2001 452 23 -- -- -- -- -- --
44

Appendix . Ground water quality data for shallow domestic wells located in southeastern Louisiana--trace elements .

ACAD 

well 

number

(fig. 1)

DOTD

local well

number

USGS site 

identification 

number

Sample date Nitrogen,

ammonia, 

 (mg/L as N)

7664-41-7

Nitrogen, 

ammonia plus 

organic nitrogen, 

(mg/L as N)

17778-88-0

Nitrogen,

nitrite plus nitrate, 

 (mg/L as N)

no CAS number

Nitrogen,

nitrite

(mg/L as N)

14797-65-0

Phosphorus,

(mg/L as P)

7732-14-0

Orthophosphate,

(mg/L as P)

14265-44-2

Carbon,

organic,

(mg/L as C)

no CAS number

31 Be-6084Z 304409093171801 6-06-2000 0.02 <0.10 <0.05 <0.010 0.035 0.026 E0.20

32 Be-5928Z 304140093343502 6-07-2000 <.02 <.10 <.05 <.010 .134 .111 E.33

33 Be-6065Z 303153093303201 6-08-2000 <.02 <.10 <.05 <.010 .066 .053 <.33

34 Ev-5500Z 303550092252401 7-10-2000 .17 .20 2.30 <.010 .091 .081 .56

35 JD-5177Z 301009092554501 7-18-2000 <.02 <.10 .26 <.010 .049 .045 .81

36 JD-5371Z 300627092464302 7-12-2000 .16 .17 <.05 <.010 -- .207 .48

37 Be-5764Z 305020093003001 7-19-2000 <.02 <.10 .72 <.010 <.006 <.010 <.33

38 Ac-6896Z 300825092350001 7-21-2000 1.03 1.10 <.05 <.010 -- .143 .92

39 Be-6077Z 303626093161201 7-26-2000 .03 E.05 <.05 <.010 .880 .800 .34

40 Al-5243Z 303647092573301 7-27-2000 <.02 <.10 .05 <.010 .023 .021 <.33

41 Ve-7436Z 300718092125801 8-02-2000 2.56 2.70 <.05 <.010 .445 -- 1.70

42 Ve- 170 300121092005701 8-03-2000 .50 .52 <.05 .017 .236 .030 .48

43 Cu-7082Z 300816093280501 8-16-2000 .33 .36 <.05 <.010 .181 .175 .78

44 V-8701Z 305810093034001 8-17-2000 <.02 <.10 .21 <.010 <.006 <.010 <.33

45 Ve-9241Z 295640092144801 8-18-2000 .48 .61 <.05 <.010 .727 .583 1.10

46 Cn-5874Z 300111093101601 9-07-2000 .60 .68 <.05 <.010 .221 .215 .73

47 SL-6924Z 303112092034001 9-11-2000 .17 .21 <.05 <.010 .072 .158 .91

48 R-5964Z 305949092363001 9-19-2000 <.02 <.10 .08 <.010 .009 <.010 E.16

49 Ac-6998Z 302145092212501 9-26-2000 1.41 1.60 <.05 <.010 -- .180 1.10

50 JD-5938Z 302109092523101 11-14-2000 .06 E.07 <.05 <.006 .541 .401 .53

51 Cu-7967Z 301707093223202 11-15-2000 E.03 <.10 <.05 .007 .223 .198 .38

52 Cu-7410Z 302108093405103 11-21-2000 .05 .11 <.05 E.003 .370 .308 E.22

53 Ac-6112Z 301947092320101 11-20-2000 .79 .84 <.05 <.006 .044 .056 .70

54 Lf-9803Z 301538092021301 11-29-2000 <.04 <.10 .71 E.003 .616 .598 E.32

55 Al-5167Z 304857092363601 12-12-2000 <.04 <.10 <.05 <.006 .162 .157 E.29

56 Al-5506Z 304128092450401 12-14-2000 <.04 <.10 .68 <.006 <.006 <.018 E.19

57 Ac-6512Z 302121092310201 1-10-2001 .67 .76 <.05 <.006 .074 .032 .68

58 Ev-5508Z 305150092213101 1-11-2001 <.04 <.10 .18 <.006 .280 .260 E.31

59 Cu-5250Z 302403093084601 1-18-2001 .10 .12 <.05 <.006 .241 .234 .38

60 Al-5240Z 303947092534101 2-06-2001 <.04 <.10 .34 E.003 <.006 <.018 E.28

Appendix 5. Nutrients and dissolved organic carbon concentrations in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 

2000-2001

[Numbers below the chemical names are the Chemical Abstracts Service (CAS) numbers. ACAD, Acadian-Pontchartrain Study Unit of the National Water Quality Assessment Program; 

DOTD, Louisiana Department of Transportation and Development; USGS, U.S. Geological Survey; mg/L, milligrams per liter; <, less than; E, estimated; --, no data]
45

ACAD 

well 

number

(fig. 1)

DOTD

local well

number

USGS site 

identification 

number

Sample date Nitrogen,

ammonia, 

 (mg/L as N)

7664-41-7

Nitrogen, 

ammonia plus 

organic nitrogen, 

(mg/L as N)

17778-88-0

Nitrogen,

nitrite plus nitrate, 

 (mg/L as N)

no CAS number

Nitrogen,

nitrite

(mg/L as N)

14797-65-0

Phosphorus,

(mg/L as P)

7732-14-0

Orthophosphate,

(mg/L as P)

14265-44-2

Carbon

organic

(mg/L as C)

no CAS number

61 SH-5527Z 305840090393801 2-14-2001 <0.04 <0.10 0.72 <0.006 <0.006 <0.018 E0.23

62 SH-5460Z 304727090392001 2-15-2001 <.04 <.10 .20 <.006 <.006 <.020 E.19

63 EF-5282Z 305130091025701 3-01-2001 <.04 <.10 .82 <.006 <.006 <.018 E.26

64 EF-5422Z 305834091033701 5-09-2001 <.04 <.10 .77 <.006 <.006 <.018 E.29

65 ST-6753Z 303032090051701 5-10-2001 <.04 <.10 E.03 <.006 .038 .034 <.33

66 ST-8617Z 303623090071601 5-24-2001 <.04 <.10 .11 <.006 .013 <.020 <.30

67 EB-6257Z 304118091055201 6-04-2001 <.04 <.10 E.03 <.006 .021 E.011 <.30

68 EF-5348Z 305808091101701 6-14-2001 <.04 <.10 E.03 <.006 .087 .083 E.29

69 EF-5450Z 304811091130701 6-28-2001 E.04 <.10 .95 E.004 <.006 <.020 E.19

70 Li-7429Z 303506090554101 6-14-2001 .55 .91 <.05 <.006 .192 .181 9.90

71 Li-7282Z 303026090420301 6-20-2001 <.04 .10 E.04 <.006 .036 .028 .35

72 Ta-8435Z 303506090184101 6-21-2001 <.04 <.10 .08 <.006 <.006 <.020 E.26

73 SH-5344Z 304001090390101 6-27-2001 E.04 <.10 E.03 .006 <.006 <.020 E.27

74 Li-7148Z 302608090534101 7-12-2001 .38 .42 <.05 <.006 .215 .245 .87

75 Ta-7292Z 302711090211801 7-19-2001 <.04 E.08 <.05 <.006 .233 .231 2.40

76 Ta- 788 303728090294301 8-02-2001 <.04 <.10 1.19 <.006 <.006 <.020 E.23

77 Wa-7324Z 305908090140901 7-26-2001 E.03 <.10 .06 <.006 <.006 <.020 .36

78 MS.AM-D016 311613090392001 8-07-2001 E.02 <.10 .25 <.006 <.006 <.020 E.18

79 MS.PK-G021 310722090280801 8-08-2001 <.04 <.10 E.04 <.006 .010 <.020 E.18

80 ST-6940Z 302725090094101 8-09-2001 E.03 E.05 E.03 <.006 .109 .103 <.30

81 Ta-9622Z 304636090303601 8-16-2001 <.04 <.10 .25 <.006 <.006 <.020 .43

82 EF-5228Z 304727090513901 9-11-2001 <.04 <.10 .08 <.006 <.006 <.020 .45

83 Ta- 815 305750090301101 9-19-2001 <.04 <.10 1.34 <.006 <.006 <.020 <.30

84 Ta-6551Z 304707090173301 9-20-2001 <.04 <.10 .05 <.006 <.006 <.020 E.21

85 Li-6487Z 301959090504201 9-21-2001 .22 .28 <.05 <.006 .152 .148 .35

86 EB-8065Z 302119090550802 9-25-2001 1.95 2.40 E.04 <.006 .436 .457 2.10

87 Li-6203Z 302049090390401 9-25-2001 .44 .56 <.05 <.006 .409 .397 2.20

88 WF-5115Z 305013091194001 9-26-2001 <.04 <.10 .13 <.006 E.004 <.020 E.18

89 Ta-7401Z 302934090321901 9-27-2001 .21 .19 <.05 <.006 .146 .122 E.16

90 MS.AM-M006 310700090520001 9-28-2001 <.04 <.10 .45 <.006 <.006 <.020 E.16

Appendix 5. Nutrients and dissolved organic carbon concentrations in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 

2000-2001--Continued
46

ACAD

well no.

(fig. 1)

DOTD

local well

number

USGS site

identification

number

Sample date Acetochlor

H

34256-82-1

Acifluorfen

H

50594-66-6

Alachlor

H

15972-60-8

Aldicarb

I

116-06-3

Atrazine

H

1912-24-9

Azinphos-methyl

I

86-50-0

Bendiocarb

I

22781-23-3

31 Be-6084Z 304409093171801 6-06-2000 <0.002 <0.06 <0.002 <0.08 <0.001 <0.001 <0.061

32 Be-5928Z 304140093343502 6-07-2000 <.002 <.06 <.002 <.08 <.001 <.001 <.061

33 Be-6065Z 303153093303201 6-08-2000 <.002 <.06 <.002 <.08 <.001 <.001 <.061

34 Ev-5500Z 303550092252401 7-10-2000 <.002 <.06 <.002 <.08 <.001 <.001 <.061

35 JD-5177Z 301009092554501 7-18-2000 <.002 <.06 .032 <.08 .056 <.001 <.061

36 JD-5371Z 300627092464302 7-12-2000 <.002 <.06 <.002 <.08 <.001 <.001 <.061

37 Be-5764Z 305020093003001 7-19-2000 <.002 <.06 <.002 <.08 <.001 <.001 <.061

38 Ac-6896Z 300825092350001 7-21-2000 <.002 <.06 <.002 <.08 <.001 <.001 <.061

39 Be-6077Z 303626093161201 7-26-2000 <.002 <.06 <.002 <.08 <.001 <.001 <.061

40 Al-5243Z 303647092573301 7-27-2000 <.002 <.06 <.002 <.08 <.001 <.001 <.061

41 Ve-7436Z 300718092125801 8-02-2000 <.002 <.06 <.002 <.08 <.001 <.001 <.061

42 Ve-170 300121092005701 8-03-2000 <.002 <.06 <.002 <.08 <.001 <.001 <.061

43 Cu-7082Z 300816093280501 8-16-2000 <.002 <.06 <.002 <.08 <.001 <.001 <.061

44 V-8701Z 305810093034001 8-17-2000 <.002 <.06 <.002 <.08 <.001 <.001 <.061

45 Ve-9241Z 295640092144801 8-18-2000 <.002 <.06 <.002 <.08 <.001 <.001 <.061

46 Cn-5874Z 300111093101601 9-07-2000 <.002 <.06 <.002 <.08 <.001 <.001 <.061

47 SL-6924Z 303112092034001 9-11-2000 -- <.06 -- <.08 -- -- <.061

48 R-5964Z 305949092363001 9-19-2000 -- <.06 -- <.08 -- -- <.061

49 Ac-6998Z 302145092212501 9-26-2000 <.002 <.06 <.002 <.08 -- <.001 <.061

50 JD-5938Z 302109092523101 11-14-2000 <.004 <.06 <.002 <.08 <.007 <.050 <.061

51 Cu-7967Z 301707093223202 11-15-2000 <.004 <.06 <.002 <.08 <.007 <.050 <.061

52 Cu-7410Z 302108093405103 11-21-2000 <.004 <.06 <.002 <.08 <.007 <.050 <.061

53 Ac-6112Z 301947092320101 11-20-2000 <.004 <.06 <.002 <.08 <.007 <.050 <.061

54 Lf-9803Z 301538092021301 11-29-2000 <.004 <.06 <.002 <.08 <.007 <.050 <.061

55 Al-5167Z 304857092363601 12-12-2000 <.004 <.06 <.002 <.08 <.007 <.050 <.061

56 Al-5506Z 304128092450401 12-14-2000 <.004 <.06 <.002 <.08 <.007 <.050 <.061

57 Ac-6512Z 302121092310201 1-10-2001 <.004 <.06 <.002 <.08 <.007 <.050 <.061

58 Ev-5508Z 305150092213101 1-11-2001 <.004 <.06 <.002 <.08 <.007 <.050 <.061

59 Cu-5250Z 302403093084601 1-18-2001 <.004 <.06 <.002 <.08 <.007 <.050 <.061

60 Al-5240Z 303947092534101 2-06-2001 <.004 <.06 <.002 <.08 <.007 <.050 <.061

Appendix 6. Pesticide concentrations in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001

[Numbers below the chemical names are the Chemical Abstracts Service (CAS) numbers. All concentrations are in micrograms per liter. ACAD, Acadian-Pontchartrain Study Unit of the National Water Quality 

Assessment Program; DOTD, Louisiana Department of Transportation and Development; USGS, U.S. Geological Survey.; H, herbicide; I, insecticide; F, fungicide; <, less than; E, estimated; --, no data]
47

Appendix 6. Pesticide concentrations in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001—Continued

ACAD 

well 

number

(fig. 1)

DOTD

local well

number

USGS site 

identification 

number

Sample date Acetochlor

H

34256-82-1

Acifluorfen

H

50594-66-6

Alachlor

H

15972-60-8

Aldicarb

I

116-06-3

Atrazine

H

1912-24-9

Azinphos-methyl

I

86-50-0

Bendiocarb

I

22781-23-3

61 SH-5527Z 305840090393801 2-14-2001 <0.004 <0.06 <0.002 <0.08 <0.007 <0.050 <0.061

62 SH-5460Z 304727090392001 2-15-2001 -- <.06 -- <.08 <.074 -- <.061

63 EF-5282Z 305130091025701 3-01-2001 <.004 <.06 <.002 <.08 <.007 <.050 <.061

64 EF-5422Z 305834091033701 5-09-2001 <.004 <.06 <.002 <.08 <.007 <.050 <.061

65 ST-6753Z 303032090051701 5-10-2001 <.004 <.06 <.002 <.08 <.007 <.050 <.061

66 ST-8617Z 303623090071601 5-24-2001 <.004 <.007 <.002 <.04 <.007 <.050 <.025

67 EB-6257Z 304118091055201 6-04-2001 <.004 <.007 <.002 <.04 <.007 <.050 <.025

68 EF-5348Z 305808091101701 6-14-2001 <.004 <.007 <.002 <.04 <.007 <.050 <.025

69 EF-5450Z 304811091130701 7-05-2001 <.004 <.007 <.002 <.04 E.004 <.050 <.025

70 Li-7429Z 303506090554101 6-14-2001 <.004 <.007 <.002 <.04 E.006 <.050 <.025

71 Li-7282Z 303026090420301 6-20-2001 <.004 <.007 <.002 <.04 <.007 <.050 <.025

72 Ta-8435Z 303506090184101 6-21-2001 <.004 <.007 <.002 <.04 <.007 <.050 <.025

73 SH-5344Z 304001090390101 7-05-2001 <.004 <.007 <.002 <.04 <.007 <.050 <.025

74 Li-7148Z 302608090534101 7-12-2001 <.004 <.007 <.002 <.04 <.007 <.050 <.025

75 Ta-7292Z 302711090211801 7-19-2001 <.004 <.007 <.002 <.04 <.007 <.050 <.025

76 Ta- 788 303728090294301 8-02-2001 <.004 <.007 <.002 <.04 <.007 <.050 <.025

77 Wa-7324Z 305908090140901 7-26-2001 <.004 <.007 <.002 <.04 <.007 <.050 <.025

78 MS.AM-D016 311613090392001 8-07-2001 <.004 <.007 <.002 <.04 <.007 <.050 <.025

79 MS.PK-G021 310722090280801 8-08-2001 <.004 <.007 <.002 <.04 <.007 <.050 <.025

80 ST-6940Z 302725090094101 8-09-2001 <.004 <.007 <.002 <.04 <.007 <.050 <.025

81 Ta-9622Z 304636090303601 8-16-2001 <.004 <.007 <.002 <.04 <.007 <.050 <.025

82 EF-5228Z 304727090513901 9-11-2001 <.004 <.007 <.002 <.04 <.007 <.050 <.025

83 Ta- 815 305750090301101 9-19-2001 <.004 <.007 <.002 <.04 <.007 <.050 <.025

84 Ta-6551Z 304707090173301 9-20-2001 <.004 <.007 <.002 <.04 <.009 <.050 <.025

85 Li-6487Z 301959090504201 9-21-2001 <.004 <.007 <.002 <.04 <.007 <.050 <.025

86 EB-8065Z 302119090550802 9-25-2001 <.004 <.007 <.002 <.04 <.007 <.050 <.025

87 Li-6203Z 302049090390401 9-25-2001 <.004 <.007 <.002 <.04 <.007 <.050 <.025

88 WF-5115Z 305013091194001 9-26-2001 <.004 <.007 <.002 <.04 <.007 <.050 <.025

89 Ta-7401Z 302934090321901 9-27-2001 <.004 <.007 <.002 <.04 <.007 <.050 <.025

90 MS.AM-M006 310700090520001 9-28-2001 <.004 <.007 <.002 <.04 <.007 <.050 <.025
48

Appendix 6. Pesticide concentrations in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001—Continued

ACAD 

well 

number

(fig. 1)

Benfluralin

H

1861-40-1

Benomyl

F

17804-35-2

Bensulfuron

methyl

83055-99-6

Bentazon

H

25057-89-0

Bromacil

H

314-40-9

Bromoxynil

H

1689-84-5

Butylate

H

2008-41-5

Carbaryl

I

63-25-2

Carbofuran

I

1563-66-2

Chloramben

 methyl ester

H

133-90-4

31 <0.002 <0.022 <0.0482 <0.02 <0.08 <0.06 <0.002 <0.003 <0.003 <0.11

32 <.002 <.022 <.0482 <.02 <.08 <.06 <.002 <.003 <.003 <.11

33 <.002 <.022 <.0482 <.02 <.08 <.06 <.002 <.003 <.003 <.11

34 <.002 <.022 <.0482 <.02 <.08 <.06 <.002 <.003 <.003 <.11

35 <.002 <.022 <.0482 <.02 <.08 <.06 <.002 <.003 <.003 <.11

36 <.002 <.022 <.0482 <.02 <.08 <.06 <.002 <.003 <.003 <.11

37 <.002 <.022 <.0482 <.02 <.08 <.06 <.002 <.003 <.003 <.11

38 <.002 <.022 <.0482 <.02 <.08 <.06 <.002 <.003 <.003 <.11

39 <.002 <.022 <.0482 <.02 <.08 <.06 <.002 <.003 <.003 <.11

40 <.002 <.022 <.0482 <.02 <.08 <.06 <.002 <.003 <.003 <.11

41 <.002 <.022 <.0482 <.02 <.08 <.06 <.002 <.003 <.003 <.11

42 <.002 <.022 <.0482 <.02 <.08 <.06 <.002 <.003 <.003 <.11

43 <.002 <.022 <.0482 <.02 <.08 <.06 <.002 <.003 <.003 <.11

44 <.002 <.022 <.0482 <.02 <.08 <.06 <.002 <.003 <.003 <.11

45 <.002 <.022 <.0482 <.02 <.08 <.06 <.002 <.003 <.003 <.11

46 <.002 <.022 <.0482 <.02 <.08 <.06 <.002 <.003 <.003 <.11

47 -- <.022 <.0482 <.02 <.08 <.06 -- -- -- <.11

48 -- <.022 <.0482 <.02 <.08 <.06 -- -- -- <.11

49 <.002 <.022 <.0482 <.02 <.08 <.06 <.002 <.003 <.003 <.11

50 <.010 <.022 <.0482 <.02 <.08 <.06 <.002 <.041 <.020 <.11

51 <.010 <.022 <.0482 <.02 <.08 <.06 <.002 <.041 <.020 <.11

52 <.010 <.022 <.0482 <.02 <.08 <.06 <.002 <.041 <.020 <.11

53 <.010 <.022 <.0482 <.02 <.08 <.06 <.002 <.041 <.020 <.11

54 <.010 <.022 <.0482 <.02 <.08 <.06 <.002 <.041 <.020 <.11

55 <.010 <.022 <.0482 <.02 <.08 <.06 <.002 <.041 <.020 <.11

56 <.010 <.022 <.0482 <.02 <.08 <.06 <.002 <.041 <.020 <.11

57 <.010 <.022 <.0482 <.02 <.08 <.06 <.002 <.041 <.020 <.11

58 <.010 <.022 <.0482 <.02 <.08 <.06 <.002 <.041 <.020 <.11

59 <.010 <.022 <.0482 <.02 <.08 <.06 <.002 <.041 <.020 <.11

60 <.010 <.022 <.0482 <.02 <.08 <.06 <.002 <.041 <.020 <.11
49

Appendix 6. Pesticide concentrations in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001—Continued

ACAD 

well 

number

(fig. 1)

Benfluralin

H

1861-40-1

Benomyl

F

17804-35-2

Bensulfuron

methyl

83055-99-6

Bentazon

H

25057-89-0

Bromacil

H

314-40-9

Bromoxynil

H

1689-84-5

Butylate

H

2008-41-5

Carbaryl

I

63-25-2

Carbofuran

I

1563-66-2

Chloramben 

methyl ester

H

133-90-4

61 <0.010 <0.022 <0.0482 <0.02 <0.08 <0.06 <0.002 <0.041 <0.020 <0.11

62 -- <.022 <.0482 <.02 <.08 <.06 -- -- -- <.11

63 <.010 <.022 <.0482 <.02 <.08 <.06 <.002 <.041 <.020 <.11

64 <.010 <.022 <.0482 -- <.08 <.06 <.002 <.041 <.020 <.11

65 <.010 <.022 <.0482 -- <.08 <.06 <.002 <.041 <.020 <.11

66 <.010 <.004 <.0158 <.01 <.03 <.02 <.002 <.041 <.020 <.02

67 <.010 <.004 <.0158 <.01 <.03 <.02 <.002 <.041 <.020 <.02

68 <.010 <.004 <.0158 <.01 <.03 <.02 <.002 <.041 <.020 <.02

69 <.010 <.004 <.0158 <.01 <.03 <.02 <.002 <.041 <.020 <.02

70 <.010 <.004 <.0158 <.01 <.03 <.02 <.002 E.003 <.020 <.02

71 <.010 <.004 <.0158 <.01 <.03 <.02 <.002 <.041 <.020 <.02

72 <.010 <.004 <.0158 <.01 <.03 <.02 <.002 <.041 <.020 <.02

73 <.010 <.004 <.0158 <.01 <.03 <.02 <.002 <.041 <.020 <.02

74 <.010 <.004 <.0158 <.01 <.03 <.02 <.002 <.041 <.020 <.02

75 <.010 <.004 <.0158 <.01 <.03 <.02 <.002 <.041 <.020 <.02

76 <.010 <.004 <.0158 <.01 <.03 <.02 <.002 <.041 <.020 <.02

77 <.010 <.004 <.0158 <.01 <.03 <.02 <.002 <.041 <.020 <.02

78 <.010 <.004 <.0158 <.01 <.03 <.02 <.002 <.041 <.020 <.02

79 <.010 <.004 <.0158 <.01 <.03 <.02 <.002 <.041 <.020 <.02

80 <.010 <.004 <.0158 <.01 <.03 <.02 <.002 <.041 <.020 <.02

81 <.010 <.004 <.0158 <.01 <.03 <.02 <.002 <.041 <.020 <.02

82 <.010 <.004 <.0158 <.01 <.03 <.02 <.002 <.041 <.020 <.02

83 <.010 <.004 <.0158 <.01 <.03 <.02 <.002 <.041 <.020 <.02

84 <.010 <.004 <.0158 <.01 <.03 <.02 <.002 <.041 <.020 <.02

85 <.010 <.004 <.0158 <.01 <.03 <.02 <.002 <.041 <.020 <.02

86 <.010 <.004 <.0158 <.01 <.03 <.02 <.002 <.041 <.020 <.02

87 <.010 <.004 <.0158 <.01 <.03 <.02 <.002 <.041 <.020 <.02

88 <.010 <.004 <.0158 <.01 <.03 <.02 <.002 <.041 <.020 <.02

89 <.010 <.004 <.0158 <.01 <.03 <.02 <.002 <.041 <.020 <.02

90 <.010 <.004 <.0158 <.01 <.03 <.02 <.002 <.041 <.020 <.02
50

Appendix 6. Pesticide concentrations in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001—Continued

ACAD 

well 

number

(fig. 1)

Chlorimuron

H

90982-32-4

Chlorothalonil

F

1897-45-6

Chlorpyrifos

I

2921-88-2

Clopyralid

H

1702-17-6

Cyanazine

H

21725-46-2

Cycloate

H

1134-23-2

2,4-D 

H

94-75-7

Dacthal 

(DCPA)

H

1861-32-1

Dacthal 

monoacid

H

887-54-7

2,4-DB 

H

94-82-6

31 <0.037 <0.05 <0.004 <0.04 <0.004 <0.05 <0.08 <0.002 <0.07 <0.05

32 <.037 <.05 <.004 <.04 <.004 <.05 <.08 <.002 <.07 <.05

33 <.037 <.05 <.004 <.04 <.004 <.05 <.08 <.002 <.07 <.05

34 <.037 <.05 <.004 <.04 <.004 <.05 <.08 <.002 <.07 <.05

35 <.037 <.05 <.004 <.04 <.004 <.05 <.08 <.002 <.07 <.05

36 <.037 <.05 <.004 <.04 <.004 <.05 <.08 <.002 <.07 <.05

37 <.037 <.05 <.004 <.04 <.004 <.05 <.08 <.002 <.07 <.05

38 <.037 <.05 <.004 <.04 <.004 <.05 <.08 <.002 <.07 <.05

39 <.037 <.05 <.004 <.04 <.004 <.05 <.08 <.002 <.07 <.05

40 <.037 <.05 <.004 <.04 <.004 <.05 <.08 <.002 <.07 <.05

41 <.037 <.05 <.004 <.04 <.004 <.05 <.08 <.002 <.07 <.05

42 <.037 <.05 <.004 <.04 <.004 <.05 <.08 <.002 <.07 <.05

43 <.037 <.05 <.004 <.04 <.004 <.05 <.08 <.002 <.07 <.05

44 <.037 <.05 <.004 <.04 <.004 <.05 <.08 <.002 <.07 <.05

45 <.037 <.05 <.004 <.04 <.004 <.05 <.08 <.002 -- <.05

46 <.037 <.05 <.004 <.04 <.004 <.05 <.08 <.002 <.07 <.05

47 <.037 <.05 -- <.04 -- <.05 <.08 -- <.07 <.05

48 <.037 <.05 -- <.04 -- <.05 <.08 -- <.07 <.05

49 <.037 <.05 <.004 <.04 <.004 <.05 <.08 <.002 <.07 <.05

50 <.037 <.05 <.005 <.04 <.018 <.05 <.08 <.003 <.07 <.05

51 <.037 <.05 <.005 <.04 <.018 <.05 <.08 <.003 <.07 <.05

52 <.037 <.05 <.005 <.04 <.018 <.05 <.08 <.003 <.07 <.05

53 <.037 <.05 <.005 <.04 <.018 <.05 <.08 <.003 <.07 <.05

54 <.037 <.05 <.005 <.04 <.018 <.05 <.08 <.003 <.07 <.05

55 <.037 <.05 <.005 <.04 <.018 <.05 <.08 <.003 <.07 <.05

56 <.037 <.05 <.005 <.04 <.018 <.05 <.08 <.003 <.07 <.05

57 <.037 <.05 <.005 <.04 <.018 <.05 <.08 <.003 <.07 <.05

58 <.037 <.05 <.005 <.04 <.018 <.05 <.08 <.003 <.07 <.05

59 <.037 <.05 <.005 <.04 <.018 <.05 <.08 <.003 <.07 <.05

60 <.037 <.05 <.005 <.04 <.018 <.05 <.08 <.003 <.07 <.05
51

Appendix 6. Pesticide concentrations in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001—Continued

ACAD 

well 

number

(fig. 1)

Chlorimuron

H

90982-32-4

Chlorothalonil

F

1897-45-6

Chlorpyrifos

I

2921-88-2

Clopyralid

H

1702-17-6

Cyanazine

H

21725-46-2

Cycloate

H

1134-23-2

2,4-D 

H

94-75-7

Dacthal

(DCPA)

H

1861-32-1

Dacthal 

monoacid

H

887-54-7

2,4-DB 

H

94-82-6

61 <0.037 <0.05 <0.005 <0.04 <0.018 <0.05 <0.08 <0.003 <0.07 <0.05

62 <.037 <.05 -- <.04 -- <.05 <.08 -- <.07 <.05

63 <.037 <.05 <.005 <.04 <.018 <.05 <.08 <.003 <.07 <.05

64 <.037 <.05 <.005 <.04 <.018 <.05 <.08 <.003 <.07 <.05

65 <.037 <.05 <.005 <.04 <.018 <.05 <.08 <.003 <.07 <.05

66 <.010 <.04 <.005 <.01 <.018 <.01 <.02 <.003 <.01 <.02

67 <.010 <.04 <.005 <.01 <.018 <.01 <.02 <.003 <.01 <.02

68 <.010 <.04 <.005 <.01 <.018 <.01 <.02 <.003 <.01 <.02

69 <.010 <.04 <.005 <.01 <.018 <.01 <.02 <.003 <.01 <.02

70 <.010 <.04 <.005 <.01 <.018 <.01 <.02 <.003 <.01 <.02

71 <.010 <.04 <.005 <.01 <.018 <.01 <.02 <.003 <.01 <.02

72 <.010 <.04 <.005 <.01 <.018 <.01 <.02 <.003 <.01 <.02

73 <.010 <.04 <.005 <.01 <.018 <.01 <.02 <.003 <.01 <.02

74 <.010 <.04 <.005 <.01 <.018 <.01 <.02 <.003 <.01 <.02

75 <.010 <.04 <.005 <.01 <.018 <.01 <.02 <.003 <.01 <.02

76 <.010 <.04 <.005 <.01 <.018 <.01 <.02 <.003 <.01 <.02

77 <.010 <.04 <.005 <.01 <.018 <.01 <.02 <.003 <.01 <.02

78 <.010 <.04 <.005 <.01 <.018 <.01 <.02 <.003 <.01 <.02

79 <.010 <.04 <.005 <.01 <.018 <.01 <.02 <.003 <.01 <.02

80 <.010 <.04 <.005 <.01 <.018 <.01 <.02 <.003 <.01 <.02

81 <.010 <.04 <.005 <.01 <.018 <.01 <.02 <.003 <.01 <.02

82 <.010 <.04 <.005 <.01 <.018 <.01 <.02 <.003 <.01 <.02

83 <.010 <.04 <.005 <.01 <.018 <.01 <.02 <.003 <.01 <.02

84 <.010 <.04 <.005 <.01 <.018 <.01 <.02 <.003 <.01 <.02

85 <.010 <.04 <.005 <.01 <.018 <.01 <.02 <.003 <.01 <.02

86 <.010 <.04 <.005 <.01 <.018 <.01 <.02 <.003 <.01 <.02

87 <.010 <.04 <.005 <.01 <.018 <.01 <.02 <.003 <.01 <.02

88 <.010 <.04 <.005 <.01 <.018 <.01 <.02 <.003 <.01 <.02

89 <.010 <.04 <.005 <.01 <.018 <.01 <.02 <.003 <.01 <.02

90 <.010 <.04 <.005 <.01 <.018 <.01 <.02 <.003 <.01 <.02
52

Appendix 6. Pesticide concentrations in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001—Continued

ACAD 

well 

number

(fig. 1)

Diazinon

I

333-41-5

Dicamba

H

1918-00-9

Dichlorprop

H

120-36-5

Dieldrin

I

60-57-1

Dinoseb

H

88-85-7

Diphenamid

H

957-51-7

Disulfoton

I

298-04-4

Diuron

H

330-54-1

2,4-D

methyl ester

H

1928-38-7

EPTC

H

759-94-4

Ethalfluralin

H

55283-68-6

31 <0.002 <0.10 <0.05 <0.001 <0.04 <0.06 <0.017 <0.08 <0.086 <0.002 <0.004

32 <.002 <.10 <.05 <.001 <.04 <.06 <.017 <.08 <.086 <.002 <.004

33 <.002 <.10 <.05 <.001 <.04 <.06 <.017 <.08 <.086 <.002 <.004

34 <.002 <.10 <.05 <.001 <.04 <.06 <.017 <.08 <.086 <.002 <.004

35 <.002 <.10 <.05 <.001 <.04 <.06 <.017 <.08 <.086 <.002 <.004

36 <.002 <.10 <.05 <.001 <.04 <.06 <.017 <.08 <.086 <.002 <.004

37 <.002 <.10 <.05 <.001 <.04 <.06 <.017 <.08 <.086 <.002 <.004

38 <.002 <.10 <.05 <.001 <.04 <.06 <.017 <.08 <.086 <.002 <.004

39 <.002 <.10 <.05 <.001 <.04 <.06 <.017 <.08 <.086 <.002 <.004

40 <.002 <.10 <.05 <.001 <.04 <.06 <.017 <.08 <.086 <.002 <.004

41 <.002 <.10 <.05 <.001 <.04 <.06 <.017 <.08 <.086 <.002 <.004

42 <.002 <.10 <.05 <.001 <.04 <.06 <.017 <.08 <.086 <.002 <.004

43 <.002 <.10 <.05 <.001 <.04 <.06 <.017 <.08 <.086 <.002 <.004

44 <.002 <.10 <.05 <.001 <.04 <.06 <.017 <.08 <.086 <.002 <.004

45 <.002 <.10 <.05 <.001 <.04 <.06 <.017 <.08 <.086 <.002 <.004

46 <.002 <.10 <.05 <.001 <.04 <.06 <.017 <.08 <.086 <.002 <.004

47 -- <.10 <.05 -- <.04 <.06 -- <.08 <.086 -- --

48 -- <.10 <.05 -- <.04 <.06 -- <.08 <.086 -- --

49 <.002 <.10 <.05 <.001 <.04 <.06 <.017 <.08 <.086 <.002 <.004

50 <.005 <.10 <.05 <.005 <.04 <.06 <.021 <.08 <.086 <.002 <.009

51 <.005 <.10 <.05 <.005 <.04 <.06 <.021 <.08 <.086 <.002 <.009

52 <.005 <.10 <.05 <.005 <.04 <.06 <.021 <.08 <.086 <.002 <.009

53 <.005 <.10 <.05 <.005 <.04 <.06 <.021 <.08 <.086 <.002 <.009

54 <.005 <.10 <.05 <.005 <.04 <.06 <.021 <.08 <.086 <.002 <.009

55 <.005 <.10 <.05 <.005 <.04 <.06 <.021 <.08 <.086 <.002 <.009

56 <.005 <.10 <.05 <.005 <.04 <.06 <.021 <.08 <.086 <.002 <.009

57 <.005 <.10 <.05 <.005 <.04 <.06 <.021 <.08 <.086 <.002 <.009

58 <.005 <.10 <.05 <.005 <.04 <.06 <.021 <.08 <.086 <.002 <.009

59 <.005 <.10 <.05 <.005 <.04 <.06 <.021 <.08 <.086 <.002 <.009

60 <.005 <.10 <.05 <.005 <.04 <.06 <.021 <.08 <.086 <.002 <.009
53

Appendix 6. Pesticide concentrations in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001—Continued

ACAD 

well 

number

(fig. 1)

Diazinon

I

333-41-5

Dicamba

H

1918-00-9

Dichlorprop

H

120-36-5

Dieldrin

I

60-57-1

Dinoseb

H

88-85-7

Diphenamid

H

957-51-7

Disulfoton

I

298-04-4

Diuron

H

330-54-1

2,4-D

methyl ester

H

1928-38-7

EPTC

H

759-94-4

Ethalfluralin

H

55283-68-6

61 <0.005 <0.10 <0.05 <0.005 <0.04 <0.06 <0.021 <0.08 <0.086 <0.002 <0.009

62 -- <.10 <.05 -- <.04 <.06 -- <.08 <.086 -- --

63 <.005 <.10 <.05 <.005 <.04 <.06 <.021 <.08 <.086 <.002 <.009

64 <.005 <.10 <.05 <.005 <.04 <.06 <.021 <.08 <.086 <.002 <.009

65 <.005 <.10 <.05 <.005 <.04 <.06 <.021 <.08 <.086 <.002 <.009

66 <.005 <.01 <.01 <.005 <.01 <.03 <.021 <.01 <.009 <.002 <.009

67 <.005 <.01 <.01 <.005 <.01 <.03 <.021 <.01 <.009 <.002 <.009

68 <.005 <.01 <.01 <.005 <.01 <.03 <.021 <.01 <.009 <.002 <.009

69 <.005 <.01 <.01 <.005 <.01 <.03 <.021 <.01 <.009 <.002 <.009

70 .006 <.01 <.01 <.005 <.01 <.03 <.021 <.01 <.009 <.002 <.009

71 <.005 <.01 <.01 <.005 <.01 <.03 <.021 <.01 <.009 <.002 <.009

72 <.005 <.01 <.01 <.005 <.01 <.03 <.021 <.01 <.009 <.002 <.009

73 <.005 <.01 <.01 <.005 <.01 <.03 <.021 <.01 <.009 <.002 <.009

74 <.005 <.01 <.01 <.005 <.01 <.03 <.021 <.01 <.009 <.002 <.009

75 <.005 <.01 <.01 <.005 <.01 <.03 <.021 <.01 <.009 <.002 <.009

76 <.005 <.01 <.01 <.005 <.01 <.03 <.021 <.01 <.009 <.002 <.009

77 <.005 <.01 <.01 <.005 <.01 <.03 <.021 <.01 <.009 <.002 <.009

78 <.005 <.01 <.01 <.005 <.01 <.03 <.021 <.01 <.009 <.002 <.009

79 <.005 <.01 <.01 <.005 <.01 <.03 <.021 <.01 <.009 <.002 <.009

80 <.005 <.01 <.01 <.005 <.01 <.03 <.021 <.01 <.009 <.002 <.009

81 <.005 <.01 <.01 <.005 <.01 <.03 <.021 <.01 <.009 <.002 <.009

82 <.005 <.01 <.01 <.005 <.01 <.03 <.021 <.01 <.009 <.002 <.009

83 <.005 <.01 <.01 <.005 <.01 <.03 <.021 <.01 <.009 <.002 <.009

84 <.005 <.01 <.01 <.005 <.01 <.03 <.021 <.01 <.009 <.002 <.009

85 <.005 <.01 <.01 <.005 <.01 <.03 <.021 <.01 <.009 <.002 <.009

86 <.005 <.01 <.01 <.005 <.01 <.03 <.021 <.01 <.009 <.002 <.009

87 <.005 <.01 <.01 <.005 <.01 <.03 <.021 <.01 <.009 <.002 <.009

88 <.005 <.01 <.01 <.005 <.01 <.03 <.021 <.01 <.009 <.002 <.009

89 <.005 <.01 <.01 <.005 <.01 <.03 <.021 <.01 <.009 <.002 <.009

90 <.005 <.01 <.01 <.005 <.01 <.03 <.021 <.01 <.009 <.002 <.009
54

Appendix 6. Pesticide concentrations in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001—Continued

ACAD 

well 

number

(fig. 1)

Ethopropos

I

13194-48-4

Fenuron 

H

101-42-8

Fipronil

I

120068-37-3

Flumetsulam

H

98967-40-9

Fluometuron

H

2164-17-2

Fonofos

I

944-22-9

HCH, alpha

I

319-84-6

Imazaquin

H

81335-37-7

Imazethapyr

H

81335-77-5

Imidacloprid

I

13826-41-3

Lindane

I

58-89-9

31 <0.003 <0.07 <0.004 <0.0866 <0.06 <0.003 <0.002 <0.103 <0.088 <0.106 <0.004

32 <.003 <.07 <.004 <.0866 <.06 <.003 <.002 <.103 <.088 <.106 <.004

33 <.003 <.07 <.004 <.0866 <.06 <.003 <.002 <.103 <.088 <.106 <.004

34 <.003 <.07 <.004 <.0866 <.06 <.003 <.002 <.103 <.088 <.106 <.004

35 <.003 <.07 <.004 <.0866 <.06 <.003 <.002 <.103 <.088 <.106 <.004

36 <.003 <.07 <.004 <.0866 <.06 <.003 <.002 <.103 <.088 <.106 <.004

37 <.003 <.07 <.004 <.0866 <.06 <.003 <.002 <.103 <.088 <.106 <.004

38 <.003 <.07 <.004 <.0866 <.06 <.003 <.002 <.103 <.088 <.106 <.004

39 <.003 <.07 <.004 <.0866 <.06 <.003 <.002 <.103 <.088 <.106 <.004

40 <.003 <.07 <.004 <.0866 <.06 <.003 <.002 <.103 <.088 <.106 <.004

41 <.003 <.07 <.004 <.0866 <.06 <.003 <.002 <.103 <.088 <.106 <.004

42 <.003 <.07 <.004 <.0866 <.06 <.003 <.002 <.103 <.088 <.106 <.004

43 <.003 <.07 <.004 <.0866 <.06 <.003 <.002 <.103 <.088 <.106 <.004

44 <.003 <.07 <.004 <.0866 <.06 <.003 <.002 <.103 <.088 <.106 <.004

45 <.003 <.07 <.004 <.0866 <.06 <.003 <.002 <.103 <.088 <.106 <.004

46 <.003 <.07 <.004 <.0866 <.06 <.003 <.002 <.103 <.088 <.106 <.004

47 -- <.07 <.004 <.0866 <.06 -- -- <.103 <.088 <.106 --

48 -- <.07 <.004 <.0866 <.06 -- -- <.103 <.088 <.106 --

49 <.003 <.07 <.004 <.0866 <.06 <.003 <.002 <.103 <.088 <.106 <.004

50 <.005 <.07 <.004 <.0866 <.06 <.003 <.005 <.103 <.088 <.106 <.004

51 <.005 <.07 <.004 <.0866 <.06 <.003 <.005 <.103 <.088 <.106 <.004

52 <.005 <.07 <.004 <.0866 <.06 <.003 <.005 <.103 <.088 <.106 <.004

53 <.005 <.07 <.004 <.0866 <.06 <.003 <.005 <.103 <.088 <.106 <.004

54 <.005 <.07 <.004 <.0866 <.06 <.003 <.005 <.103 <.088 <.106 <.004

55 <.005 <.07 <.004 <.0866 <.06 <.003 <.005 <.103 <.088 <.106 <.004

56 <.005 <.07 <.004 <.0866 <.06 <.003 <.005 <.103 <.088 <.106 <.004

57 <.005 <.07 -- <.0866 <.06 <.003 <.005 <.103 <.088 <.106 <.004

58 <.005 <.07 <.004 <.0866 <.06 <.003 <.005 <.103 <.088 <.106 <.004

59 <.005 <.07 <.004 <.0866 <.06 <.003 <.005 <.103 <.088 <.106 <.004

60 <.005 <.07 <.004 <.0866 <.06 <.003 <.005 <.103 <.088 <.106 <.004
55

Appendix 6. Pesticide concentrations in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001—Continued

ACAD 

well 

number

(fig. 1)

Ethopropos

I

13194-48-4

Fenuron 

H

101-42-8

Fipronil

I

120068-37-3

Flumetsulam

H

98967-40-9

Fluometuron

H

2164-17-2

Fonofos

I

944-22-9

HCH, alpha

I

319-84-6

Imazaquin

H

81335-37-7

Imazethapyr

H

81335-77-5

Imidacloprid

I

13826-41-3

Lindane

I

58-89-9

61 <0.005 <0.07 -- <0.087 <0.06 <0.003 <0.005 <0.103 <0.088 <0.106 <0.004

62 -- <.07 -- <.087 <.06 -- -- <.103 <.088 <.106 --

63 <.005 <.07 -- <.087 <.06 <.003 <.005 <.103 <.088 <.106 <.004

64 <.005 <.07 -- <.087 <.06 <.003 <.005 <.103 <.088 <.106 <.004

65 <.005 <.07 -- <.087 <.06 <.003 <.005 <.103 <.088 <.106 <.004

66 <.005 <.03 -- <.011 <.03 <.003 <.005 <.016 <.017 <.007 <.004

67 <.005 <.03 -- <.011 <.03 <.003 <.005 <.016 <.017 <.007 <.004

68 <.005 <.03 -- <.011 <.03 <.003 <.005 <.016 <.017 <.007 <.004

69 <.005 <.03 -- <.011 <.03 <.003 <.005 <.016 <.017 <.007 <.004

70 <.005 <.03 -- <.011 <.03 <.003 <.005 <.016 <.017 <.007 <.004

71 <.005 <.03 <.004 <.011 <.03 <.003 <.005 <.016 <.017 <.007 <.004

72 <.005 <.03 <.004 <.011 <.03 <.003 <.005 <.016 <.017 <.007 <.004

73 <.005 <.03 <.004 <.011 <.03 <.003 <.005 <.016 <.017 <.007 <.004

74 <.005 <.03 <.004 <.011 <.03 <.003 <.005 <.016 <.017 <.007 <.004

75 <.005 <.03 <.004 <.011 <.03 <.003 <.005 <.016 <.017 <.007 <.004

76 <.005 <.03 <.004 <.011 <.03 <.003 <.005 <.016 <.017 <.007 <.004

77 <.005 <.03 <.004 <.011 <.03 <.003 <.005 <.016 <.017 <.007 <.004

78 <.005 <.03 -- <.011 <.03 <.003 <.005 <.016 <.017 <.007 <.004

79 <.005 <.03 -- <.011 <.03 <.003 <.005 <.016 <.017 <.007 <.004

80 <.005 <.03 -- <.011 <.03 <.003 <.005 <.016 <.017 <.007 <.004

81 <.005 <.03 -- <.011 <.03 <.003 <.005 <.016 <.017 <.007 <.004

82 <.005 <.03 -- <.011 <.03 <.003 <.005 <.016 <.017 <.007 <.004

83 <.005 <.03 -- <.011 <.03 <.003 <.005 <.016 <.017 <.007 <.004

84 <.005 <.03 -- <.011 <.03 <.003 <.005 <.016 <.017 <.007 <.004

85 <.005 <.03 -- <.011 <.03 <.003 <.005 <.016 <.017 <.007 <.004

86 <.005 <.03 -- <.011 <.03 <.003 <.005 <.016 <.017 <.007 <.004

87 <.005 <.03 -- <.011 <.03 <.003 <.005 <.016 <.017 <.007 <.004

88 <.005 <.03 -- <.011 <.03 <.003 <.005 <.016 <.017 <.007 <.004

89 <.005 <.03 -- <.011 <.03 <.003 <.005 <.016 <.017 <.007 <.004

90 <.005 <.03 -- <.011 <.03 <.003 <.005 <.016 <.017 <.007 <.004
56

Appendix 6. Pesticide concentrations in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001—Continued

ACAD 

well 

number

(fig. 1)

Linuron

H

330-55-2

Malathion

I

121-75-5

MCPA

H

94-74-6

MCPB

H

94-81-5

Metalaxyl

F

57837-19-1

Methiocarb

I

2032-65-7

Methomyl

I

16752-77-5

Methyl

parathion

I

298-00-0

Metolachlor

H

51218-45-2

Metribuzin

H

21087-64-9

31 <0.002 <0.005 <0.06 <0.06 <0.057 <0.08 <0.08 <0.006 <0.002 <0.004

32 <.002 <.005 <.06 <.06 <.057 <.08 <.08 <.006 <.002 <.004

33 <.002 <.005 <.06 <.06 <.057 <.08 <.08 <.006 <.002 <.004

34 <.002 <.005 <.06 <.06 <.057 <.08 <.08 <.006 .032 <.004

35 <.002 <.005 <.06 <.06 <.057 <.08 <.08 <.006 .252 .031

36 <.002 <.005 <.06 <.06 <.057 <.08 <.08 <.006 <.002 <.004

37 <.002 <.005 <.06 <.06 <.057 <.08 <.08 <.006 <.002 <.004

38 <.002 <.005 <.06 <.06 <.057 <.08 <.08 <.006 <.002 <.004

39 <.002 <.005 <.06 <.06 <.057 <.08 <.08 <.006 <.002 <.004

40 <.002 <.005 <.06 <.06 <.057 <.08 <.08 <.006 <.002 <.004

41 <.002 <.005 <.06 <.06 <.057 <.08 <.08 <.006 <.002 <.004

42 <.002 <.005 <.06 <.06 <.057 <.08 <.08 <.006 <.002 <.004

43 <.002 <.005 <.06 <.06 <.057 <.08 <.08 <.006 <.002 <.004

44 <.002 <.005 <.06 <.06 <.057 <.08 <.08 <.006 <.002 <.004

45 <.002 <.005 <.06 <.06 <.057 <.08 <.08 <.006 <.002 <.004

46 <.002 <.005 <.06 <.06 <.057 <.08 <.08 <.006 <.002 <.004

47 -- -- <.06 <.06 <.057 <.08 <.08 -- -- --

48 -- -- <.06 <.06 <.057 <.08 <.08 -- -- --

49 <.002 <.005 <.06 <.06 <.057 <.08 <.08 <.006 <.002 <.004

50 <.035 <.027 <.06 <.06 <.057 <.08 <.08 <.006 <.013 <.006

51 <.035 <.027 <.06 <.06 <.057 <.08 <.08 <.006 <.013 <.006

52 <.035 <.027 <.06 <.06 <.057 <.08 <.08 <.006 <.013 <.006

53 <.035 <.027 <.06 <.06 <.057 <.08 <.08 <.006 <.013 <.006

54 <.035 <.027 <.06 <.06 <.057 <.08 <.08 <.006 <.013 <.006

55 <.035 <.027 <.06 <.06 <.057 <.08 <.08 <.006 <.013 <.006

56 <.035 <.027 <.06 <.06 <.057 <.08 <.08 <.006 <.013 <.006

57 <.035 <.027 <.06 <.06 <.057 <.08 <.08 <.006 <.013 <.006

58 <.035 <.027 <.06 <.06 <.057 <.08 <.08 <.006 <.013 <.006

59 <.035 <.027 <.06 <.06 <.057 <.08 <.08 <.006 <.013 <.006

60 <.035 <.027 <.06 <.06 <.057 <.08 <.08 <.006 <.013 <.006
57

Appendix 6. Pesticide concentrations in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001—Continued

ACAD 

well 

number

(fig. 1)

Linuron

H

330-55-2

Malathion

I

121-75-5

MCPA

H

94-74-6

MCPB

H

94-81-5

Metalaxyl

F

57837-19-1

Methiocarb

I

2032-65-7

Methomyl

I

16752-77-5

Methyl

parathion

I

298-00-0

Metolachlor

H

51218-45-2

Metribuzin

H

21087-64-9

61 <0.035 <0.027 <0.06 <0.06 <0.057 <0.08 <0.08 <0.006 <0.013 <0.006

62 -- -- <.06 <.06 <.057 <.08 <.08 -- -- --

63 <.035 <.027 <.06 <.06 <.057 <.08 <.08 <.006 <.013 <.006

64 <.035 <.027 <.06 <.06 <.057 <.08 <.08 <.006 <.013 <.006

65 <.035 <.027 <.06 <.06 <.057 <.08 <.08 <.006 <.013 <.006

66 <.035 <.027 <.02 <.01 <.020 <.008 <.004 <.006 <.013 <.006

67 <.035 <.027 <.02 <.01 <.020 <.008 <.004 <.006 <.013 <.006

68 <.035 <.027 <.02 <.01 <.020 <.008 <.004 <.006 <.013 <.006

69 <.035 <.027 <.02 <.01 <.020 <.008 <.004 <.006 <.013 <.006

70 <.035 <.027 <.02 <.01 <.020 <.008 <.004 <.006 <.013 <.006

71 <.035 <.027 <.02 <.01 <.020 <.008 <.004 <.006 <.013 <.006

72 <.035 <.027 <.02 <.01 <.020 <.008 <.004 <.006 <.013 <.006

73 <.035 <.027 <.02 <.01 <.020 <.008 <.004 <.006 <.013 <.006

74 <.035 <.027 <.02 <.01 <.020 <.008 <.004 <.006 <.013 <.006

75 <.035 <.027 <.02 <.01 <.020 <.008 <.004 <.006 <.013 <.006

76 <.035 <.027 <.02 <.01 <.020 <.008 <.004 <.006 <.013 <.006

77 <.035 <.027 <.02 <.01 <.020 <.008 <.004 <.006 <.013 <.006

78 <.035 <.027 <.02 <.01 <.020 <.008 <.004 <.006 <.013 <.006

79 <.035 <.027 <.02 <.01 <.020 <.008 <.004 <.006 <.013 <.006

80 <.035 <.027 <.02 <.01 <.020 <.008 <.004 <.006 <.013 <.006

81 <.035 <.027 <.02 <.01 <.020 <.008 <.004 <.006 <.013 <.006

82 <.035 <.027 <.02 <.01 <.020 <.008 <.004 <.006 <.013 <.006

83 <.035 <.027 <.02 <.01 <.020 <.008 <.004 <.006 <.013 <.006

84 <.035 <.027 <.02 <.01 <.020 <.008 <.004 <.006 <.013 <.006

85 <.035 <.027 <.02 <.01 <.020 <.008 <.004 <.006 <.013 <.006

86 <.035 <.027 <.02 <.01 <.020 <.008 <.004 <.006 <.013 <.006

87 <.035 <.027 <.02 <.01 <.020 <.008 <.004 <.006 <.013 <.006

88 <.035 <.027 <.02 <.01 <.020 <.008 <.004 <.006 <.013 <.006

89 <.035 <.027 <.02 <.01 <.020 <.008 <.004 <.006 <.013 <.006

90 <.035 <.027 <.02 <.01 <.020 <.008 <.004 <.006 <.013 <.006
58

Appendix 6. Pesticide concentrations in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001—Continued

ACAD 

well 

number

(fig. 1)

Metsulfuron 

methyl

H

74223-64-6

Molinate

H

2212-67-1

Napropamide

H

15299-99-7

Neburon

H

555-37-3

Nicosulfuron

H

111991-09-4

Norflurazon

H

27314-13-2

Oryzalin

H

19044-88-3

Oxamyl

I

23135-22-0

Parathion

I

56-38-2

Pebulate

H

1114-71-2

31 <0.114 <0.004 <0.003 <0.07 <0.065 <0.08 <0.07 <0.02 <0.004 <0.004

32 <.114 <.004 <.003 <.07 <.065 <.08 <.07 <.02 <.004 <.004

33 <.114 <.004 <.003 <.07 <.065 <.08 <.07 <.02 <.004 <.004

34 <.114 <.004 <.003 <.07 <.065 <.08 <.07 <.02 <.004 <.004

35 <.114 <.004 <.003 <.07 <.065 <.08 <.07 <.02 <.004 <.004

36 <.114 <.004 <.003 <.07 <.065 <.08 <.07 <.02 <.004 <.004

37 <.114 <.004 <.003 <.07 <.065 <.08 <.07 <.02 <.004 <.004

38 <.114 <.004 <.003 <.07 <.065 <.08 <.07 <.02 <.004 <.004

39 <.114 <.004 <.003 <.07 <.065 <.08 <.07 <.02 <.004 <.004

40 <.114 <.004 <.003 <.07 <.065 <.08 <.07 <.02 <.004 <.004

41 <.114 <.004 <.003 <.07 <.065 <.08 <.07 <.02 <.004 <.004

42 <.114 <.004 <.003 <.07 <.065 <.08 <.07 <.02 <.004 <.004

43 <.114 <.004 <.003 <.07 <.065 <.08 <.07 <.02 <.004 <.004

44 <.114 <.004 <.003 <.07 <.065 <.08 <.07 <.02 <.004 <.004

45 <.114 <.004 <.003 <.07 <.065 <.08 <.07 <.02 <.004 <.004

46 <.114 <.004 <.003 <.07 <.065 <.08 <.07 <.02 <.004 <.004

47 <.114 -- -- <.07 <.065 <.08 <.07 <.02 -- --

48 <.114 -- -- <.07 <.065 <.08 <.07 <.02 -- --

49 <.114 <.004 <.003 <.07 <.065 <.08 <.07 <.02 <.004 <.004

50 <.114 <.002 <.007 <.07 <.065 <.08 <.07 <.02 <.007 <.002

51 <.114 <.002 <.007 <.07 <.065 <.08 <.07 <.02 <.007 <.002

52 <.114 <.002 <.007 <.07 <.065 <.08 <.07 <.02 <.007 <.002

53 <.114 <.002 <.007 <.07 <.065 <.08 <.07 <.02 <.007 <.002

54 <.114 <.002 <.007 <.07 <.065 <.08 <.07 <.02 <.007 <.002

55 <.114 <.002 <.007 <.07 <.065 <.08 <.07 <.02 <.007 <.002

56 <.114 <.002 <.007 <.07 <.065 <.08 <.07 <.02 <.007 <.002

57 <.114 <.002 <.007 <.07 <.065 <.08 <.07 <.02 <.007 <.002

58 <.114 <.002 <.007 <.07 <.065 <.08 <.07 <.02 <.007 <.002

59 <.114 <.002 <.007 <.07 <.065 <.08 <.07 <.02 <.007 <.002

60 <.114 <.002 <.007 <.07 <.065 <.08 <.07 <.02 <.007 <.002
59

Appendix 6. Pesticide concentrations in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001—Continued

ACAD 

well 

number

(fig. 1)

Metsulfuron 

methyl

H

74223-64-6

Molinate

H

2212-67-1

Napropamide

H

15299-99-7

Neburon

H

555-37-3

Nicosulfuron

H

111991-09-4

Norflurazon

H

27314-13-2

Oryzalin

H

19044-88-3

Oxamyl

I

23135-22-0

Parathion

I

56-38-2

Pebulate

H

1114-71-2

61 <0.114 <0.002 <0.007 <0.07 <0.065 <0.08 <0.07 <0.02 <0.007 <0.002

62 <.114 -- -- <.07 <.065 <.08 <.07 <.02 -- --

63 <.114 <.002 <.007 <.07 <.065 <.08 <.07 <.02 <.007 <.002

64 <.114 <.002 <.007 <.07 <.065 <.08 <.07 <.02 <.007 <.002

65 <.114 <.002 <.007 <.07 <.065 <.08 <.07 <.02 <.007 <.002

66 <.025 <.002 <.007 <.01 <.013 <.02 <.02 <.01 <.007 <.002

67 <.025 <.002 <.007 <.01 <.013 <.02 <.02 <.01 <.007 <.002

68 <.025 <.002 <.007 <.01 <.013 <.02 <.02 <.01 <.007 <.002

69 <.025 <.002 <.007 <.01 <.013 <.02 <.02 <.01 <.007 <.002

70 <.025 <.002 <.007 <.01 <.013 <.02 <.02 <.01 <.007 <.002

71 <.025 <.002 <.007 <.01 <.013 <.02 <.02 <.01 <.007 <.002

72 <.025 <.002 <.007 <.01 <.013 <.02 <.02 <.01 <.007 <.002

73 <.025 <.002 <.007 <.01 <.013 <.02 <.02 <.01 <.007 <.002

74 <.025 <.002 <.007 <.01 <.013 <.02 <.02 <.01 <.007 <.002

75 <.025 <.002 <.007 <.01 <.013 <.02 <.02 <.01 <.007 <.002

76 <.025 <.002 <.007 <.01 <.013 <.02 <.02 <.01 <.007 <.002

77 <.025 <.002 <.007 <.01 <.013 <.02 <.02 <.01 <.007 <.002

78 <.025 <.002 <.007 <.01 <.013 <.02 <.02 <.01 <.007 <.002

79 <.025 <.002 <.007 <.01 <.013 <.02 <.02 <.01 <.007 <.002

80 <.025 <.002 <.007 <.01 <.013 <.02 <.02 <.01 <.007 <.002

81 <.025 <.002 <.007 <.01 <.013 <.02 <.02 <.01 <.007 <.002

82 <.025 <.002 <.007 <.01 <.013 <.02 <.02 <.01 <.007 <.002

83 <.025 <.002 <.007 <.01 <.013 <.02 <.02 <.01 <.007 <.002

84 <.025 <.002 <.007 <.01 <.013 <.02 <.02 <.01 <.007 <.002

85 <.025 <.002 <.007 <.01 <.013 <.02 <.02 <.01 <.007 <.002

86 <.025 <.002 <.007 <.01 <.013 <.02 <.02 <.01 <.007 <.002

87 <.025 <.002 <.007 <.01 <.013 <.02 <.02 <.01 <.007 <.002

88 <.025 <.002 <.007 <.01 <.013 <.02 <.02 <.01 <.007 <.002

89 <.025 <.002 <.007 <.01 <.013 <.02 <.02 <.01 <.007 <.002

90 <.025 <.002 <.007 <.01 <.013 <.02 <.02 <.01 <.007 <.002
60

Appendix 6. Pesticide concentrations in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001—Continued

ACAD 

well 

number

(fig. 1)

Pendimethalin

H

40487-42-1

cis-Permethrin

I

52341-33-0

Phorate

I

298-02-2

Picloram

H

1918-02-1

Prometon

H

1610-18-0

Pronamide

H

23950-58-5

Propachlor

H

1918-16-7

Propanil

H

709-98-8

Propargite

I

2312-35-8

Propham

H

122-42-9

Propiconazole

F

60207-90-1

31 <0.004 <0.005 <0.002 <0.07 <0.018 <0.003 <0.007 <0.004 <0.013 <0.07 <0.064

32 <.004 <.005 <.002 <.07 <.018 <.003 <.007 <.004 <.013 <.07 <.064

33 <.004 <.005 <.002 <.07 <.018 <.003 <.007 <.004 <.013 <.07 <.064

34 <.004 <.005 <.002 <.07 <.018 <.003 <.007 <.004 <.013 <.07 <.064

35 <.004 <.005 <.002 .09 <.018 <.003 <.007 <.004 <.013 <.07 <.064

36 <.004 <.005 <.002 <.07 <.018 <.003 <.007 <.004 <.013 <.07 <.064

37 <.004 <.005 <.002 <.07 <.018 <.003 <.007 <.004 <.013 <.07 <.064

38 <.004 <.005 <.002 <.07 <.018 <.003 <.007 <.004 <.013 <.07 <.064

39 <.004 <.005 <.002 <.07 <.018 <.003 <.007 <.004 <.013 <.07 <.064

40 <.004 <.005 <.002 <.07 <.018 <.003 <.007 <.004 <.013 <.07 <.064

41 <.004 <.005 <.002 <.07 <.018 <.003 <.007 <.004 <.013 <.07 <.064

42 <.004 <.005 <.002 <.07 <.018 <.003 <.007 <.004 <.013 <.07 <.064

43 <.004 <.005 <.002 <.07 <.018 <.003 <.007 <.004 <.013 <.07 <.064

44 <.004 <.005 <.002 <.07 <.018 <.003 <.007 <.004 <.013 <.07 <.064

45 <.004 <.005 <.002 <.07 <.018 <.003 <.007 <.004 <.013 <.07 <.064

46 <.004 <.005 <.002 <.07 <.018 <.003 <.007 <.004 <.013 <.07 <.064

47 -- -- -- <.07 -- -- -- -- -- <.07 <.064

48 -- -- -- <.07 -- -- -- -- -- <.07 <.064

49 <.004 <.005 <.002 <.07 <.018 <.003 <.007 <.004 <.013 <.07 <.064

50 <.010 <.006 <.011 <.07 <.015 <.004 <.010 <.011 <.023 <.07 <.064

51 <.010 <.006 <.011 <.07 <.015 <.004 <.010 <.011 <.023 <.07 <.064

52 <.010 <.006 <.011 <.07 <.015 <.004 <.010 <.011 <.023 <.07 <.064

53 <.010 <.006 <.011 <.07 <.015 <.004 <.010 <.011 <.023 <.07 <.064

54 <.010 <.006 <.011 <.07 <.015 <.004 <.010 <.011 <.023 <.07 <.064

55 <.010 <.006 <.011 <.07 <.015 <.004 <.010 <.011 <.023 <.07 <.064

56 <.010 <.006 <.011 <.07 <.015 <.004 <.010 <.011 <.023 <.07 <.064

57 <.010 <.006 <.011 <.07 <.015 <.004 <.010 <.011 <.023 <.07 <.064

58 <.010 <.006 <.011 <.07 <.015 <.004 <.010 <.011 <.023 <.07 <.064

59 <.010 <.006 <.011 <.07 <.015 <.004 <.010 <.011 <.023 <.07 <.064

60 <.010 <.006 <.011 <.07 <.015 <.004 <.010 <.011 <.023 <.07 <.064
61

Appendix 6. Pesticide concentrations in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001—Continued

ACAD 

well 

number

(fig. 1)

Pendimethalin

H

40487-42-1

cis-Permethrin

I

52341-33-0

Phorate

I

298-02-2

Picloram

H

1918-02-1

Prometon

H

1610-18-0

Pronamide

H

23950-58-5

Propachlor

H

1918-16-7

Propanil

H

709-98-8

Propargite

I

2312-35-8

Propham

H

122-42-9

Propiconazole

F

60207-90-1

61 <0.010 <0.006 <0.011 <0.07 <0.015 <0.004 <0.010 <0.011 <0.023 <0.07 <0.064

62 -- -- -- <.07 -- -- -- -- -- <.07 <.064

63 <.010 <.006 <.011 <.07 <.015 <.004 <.010 <.011 <.023 <.07 <.064

64 <.010 <.006 <.011 <.07 <.015 <.004 <.010 <.011 <.023 <.07 <.064

65 <.010 <.006 <.011 <.07 <.015 <.004 <.010 <.011 <.023 <.07 <.064

66 <.010 <.006 <.011 <.02 <.015 <.004 <.010 <.011 <.023 <.01 <.021

67 <.010 <.006 <.011 <.02 <.015 <.004 <.010 <.011 <.023 <.01 <.021

68 <.010 <.006 <.011 <.02 <.015 <.004 <.010 <.011 <.023 <.01 <.021

69 <.010 <.006 <.011 <.02 <.015 <.004 <.010 <.011 <.023 <.01 <.021

70 <.010 <.006 <.011 <.02 <.015 <.004 <.010 <.011 <.023 <.01 <.021

71 <.010 <.006 <.011 <.02 <.015 <.004 <.010 <.011 <.023 <.01 <.021

72 <.010 <.006 <.011 <.02 <.015 <.004 <.010 <.011 <.023 <.01 <.021

73 <.010 <.006 <.011 <.02 <.015 <.004 <.010 <.011 <.023 <.01 <.021

74 <.010 <.006 <.011 <.02 <.015 <.004 <.010 <.011 <.023 <.01 <.021

75 <.010 <.006 <.011 <.02 <.015 <.004 <.010 <.011 <.023 <.01 <.021

76 <.010 <.006 <.011 <.02 <.015 <.004 <.010 <.011 <.023 <.01 <.021

77 <.010 <.006 <.011 <.02 <.015 <.004 <.010 <.011 <.023 <.01 <.021

78 <.010 <.006 <.011 <.02 <.015 <.004 <.010 <.011 <.023 <.01 <.021

79 <.010 <.006 <.011 <.02 <.015 <.004 <.010 <.011 <.023 <.01 <.021

80 <.010 <.006 <.011 <.02 <.015 <.004 <.010 <.011 <.023 <.01 <.021

81 <.010 <.006 <.011 <.02 <.015 <.004 <.010 <.011 <.023 <.01 <.021

82 <.010 <.006 <.011 <.02 <.015 <.004 <.010 <.011 <.023 <.01 <.052

83 <.010 <.006 <.011 <.02 <.015 <.004 <.010 <.011 <.023 <.01 <.021

84 <.010 <.006 <.011 <.02 <.015 <.004 <.010 <.011 <.023 <.01 <.021

85 <.010 <.006 <.011 <.02 <.015 <.004 <.010 <.011 <.023 <.01 <.021

86 <.010 <.006 <.011 <.02 <.015 <.004 <.010 <.011 <.023 <.01 <.021

87 <.010 <.006 <.011 <.02 <.015 <.004 <.010 <.011 <.023 <.01 <.021

88 <.010 <.006 <.011 <.02 <.015 <.004 <.010 <.011 <.023 <.01 <.021

89 <.010 <.006 <.011 <.02 <.015 <.004 <.010 <.011 <.023 <.01 <.021

90 <.010 <.006 <.011 <.02 <.015 <.004 <.010 <.011 <.023 <.01 <.021
62

Appendix 6. Pesticide concentrations in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001—Continued

ACAD 

well 

number

(fig. 1)

Propoxur

I

204-043-8

Siduron

H

1982-49-6

Simazine

H

122-34-9

Sulfometuron 

methyl

H

74222-97-2

Tebuthiuron

H

34014-18-1

Terbacil

H

5902-51-2

Terbufos

I

13071-79-9

Thiobencarb

H

28249-77-6

Tri-allate

H

2303-17-5

Tribenuron

methyl

H

101200-48-0

Triclopyr

H

55335-06-3

Trifluralin

H

1582-09-8

31 <0.06 <0.093 <0.005 <0.039 <0.010 <0.10 <0.013 <0.002 <0.001 -- <0.10 <0.002

32 <.06 <.093 <.005 <.039 <.010 <.10 <.013 <.002 <.001 <.07 <.10 <.002

33 <.06 <.093 <.005 <.039 <.010 <.10 <.013 <.002 <.001 <.07 <.10 <.002

34 <.06 <.093 <.005 <.039 0.013 <.10 <.013 <.002 <.001 <.07 <.10 <.002

35 <.06 <.093 <.005 <.039 <.010 <.10 <.013 <.002 <.001 <.07 <.10 <.002

36 <.06 <.093 <.005 <.039 <.010 <.10 <.013 <.002 <.001 <.07 <.10 <.002

37 <.06 <.093 <.005 <.039 <.010 <.10 <.013 <.002 <.001 <.07 <.10 <.002

38 <.06 <.093 <.005 <.039 <.010 <.10 <.013 <.002 <.001 <.07 <.10 <.002

39 <.06 <.093 <.005 <.039 <.010 <.10 <.013 <.002 <.001 <.07 <.10 <.002

40 <.06 <.093 <.005 <.039 <.010 <.10 <.013 <.002 <.001 <.07 <.10 <.002

41 <.06 <.093 <.005 <.039 <.010 <.10 <.013 <.002 <.001 <.07 <.10 <.002

42 <.06 <.093 <.005 <.039 <.010 <.10 <.013 <.002 <.001 <.07 <.10 <.002

43 <.06 <.093 <.005 <.039 <.010 <.10 <.013 <.002 <.001 <.07 <.10 <.002

44 <.06 <.093 <.005 <.039 <.010 <.10 <.013 <.002 <.001 <.07 <.10 <.002

45 <.06 <.093 <.005 <.039 <.010 <.10 <.013 <.002 <.001 <.07 <.10 <.002

46 <.06 <.093 <.005 <.039 <.010 <.10 <.013 <.002 <.001 <.07 <.10 <.002

47 <.06 <.093 -- <.039 -- -- -- -- -- <.07 <.10 --

48 <.06 <.093 -- <.039 -- -- -- -- -- <.07 <.10 --

49 <.06 <.093 <.005 <.039 -- <.10 <.013 <.002 <.001 <.07 <.10 <.002

50 <.06 <.093 <.011 <.039 <.016 <.10 <.017 <.005 <.002 <.07 <.10 <.009

51 <.06 <.093 <.011 <.039 <.016 <.10 <.017 <.005 <.002 <.07 <.10 <.009

52 <.06 <.093 <.011 <.039 <.016 <.10 <.017 <.005 <.002 <.07 <.10 <.009

53 <.06 <.093 <.011 <.039 <.016 <.10 <.017 <.005 <.002 <.07 <.10 <.009

54 <.06 <.093 <.011 <.039 <.016 <.10 <.017 <.005 <.002 <.07 <.10 <.009

55 <.06 <.093 <.011 <.039 <.016 <.10 <.017 <.005 <.002 <.07 <.10 <.009

56 <.06 <.093 <.011 <.039 <.016 <.10 <.017 <.005 <.002 <.07 <.10 <.009

57 <.06 <.093 <.011 <.039 <.016 <.10 <.017 <.005 <.002 <.07 <.10 <.009

58 <.06 <.093 <.011 <.039 <.016 <.10 <.017 <.005 <.002 <.07 <.10 <.009

59 <.06 <.093 <.011 <.039 <.016 <.10 <.017 <.005 <.002 <.07 <.10 <.009

60 <.06 <.093 <.011 <.039 <.016 <.10 <.017 <.005 <.002 <.07 <.10 <.009
63

Appendix 6. Pesticide concentrations in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001—Continued

ACAD 

well 

number

(fig. 1)

Propoxur

I

204-043-8

Siduron

H

1982-49-6

Simazine

H

122-34-9

Sulfometuron 

methyl

H

74222-97-2

Tebuthiuron

H

34014-18-1

Terbacil

H

5902-51-2

Terbufos

I

13071-79-9

Thiobencarb

H

28249-77-6

Triallate

H

2303-17-5

Tribenuron

methyl

H

101200-48-0

Triclopyr

H

55335-06-3

Trifluralin

H

1582-09-8

61 <0.06 <0.093 <0.011 <0.039 <0.016 <0.10 <0.017 <0.005 <0.002 <0.07 <0.10 <0.009

62 <.06 <.093 -- <.039 <.077 <.10 -- -- -- <.07 <.10 --

63 <.06 <.093 <.011 <.039 <.016 <.10 <.017 <.005 <.002 <.07 <.10 <.009

64 <.06 <.093 <.011 <.039 <.016 <.10 <.017 <.005 <.002 -- <.10 <.009

65 <.06 <.093 <.011 <.039 <.016 <.10 <.017 <.005 <.002 -- <.10 <.009

66 <.01 <.017 <.011 <.009 <.016 <.010 <.017 <.005 <.002 <.01 <.02 <.009

67 <.01 <.017 <.011 <.009 <.016 <.010 <.017 <.005 <.002 <.01 <.02 <.009

68 <.01 <.017 <.011 <.009 <.016 <.010 <.017 <.005 <.002 <.01 <.02 <.009

69 <.01 <.017 <.011 <.009 <.016 <.010 <.017 <.005 <.002 <.01 <.02 <.009

70 <.01 <.017 <.011 <.009 <.016 <.010 <.017 <.005 <.002 <.01 <.02 <.009

71 <.01 <.017 <.011 <.009 <.016 <.010 <.017 <.005 <.002 <.01 <.02 <.009

72 <.01 <.017 <.011 <.009 <.016 <.010 <.017 <.005 <.002 <.01 <.02 <.009

73 <.01 <.017 <.011 <.009 <.016 <.010 <.017 <.005 <.002 <.01 <.02 <.009

74 <.01 <.017 <.011 <.009 <.016 <.010 <.017 <.005 <.002 <.01 <.02 <.009

75 <.01 <.017 <.011 <.009 <.016 <.010 <.017 <.005 <.002 <.01 <.02 <.009

76 <.01 <.017 <.011 <.009 <.016 <.010 <.017 <.005 <.002 <.01 <.02 <.009

77 <.01 <.017 <.011 <.009 <.016 <.010 <.017 <.005 <.002 <.01 <.02 <.009

78 <.01 <.017 <.011 <.009 <.016 <.010 <.017 <.005 <.002 <.01 <.02 <.009

79 <.01 <.017 <.011 <.009 <.016 <.010 <.017 <.005 <.002 <.01 <.02 <.009

80 <.01 <.017 <.011 <.009 <.016 <.010 <.017 <.005 <.002 <.01 <.02 <.009

81 <.01 <.017 <.011 <.009 <.016 <.010 <.017 <.005 <.002 <.01 <.02 <.009

82 <.01 <.017 <.011 <.009 <.016 <.010 <.017 <.005 <.002 <.01 <.02 <.009

83 <.01 <.017 <.011 <.009 <.016 <.010 <.017 <.005 <.002 <.01 <.02 <.009

84 <.01 <.017 <.011 <.009 <.016 <.010 <.017 <.005 <.002 <.01 <.02 <.009

85 <.01 <.017 <.011 <.009 <.016 <.010 <.017 <.005 <.002 <.01 <.02 <.009

86 <.01 <.017 <.011 <.009 <.016 <.010 <.017 <.005 <.002 <.01 <.02 <.009

87 <.01 <.017 <.011 <.009 <.016 <.010 <.017 <.005 <.002 <.01 <.02 <.009

88 <.01 <.017 <.011 <.009 <.016 <.010 <.017 <.005 <.002 <.01 <.02 <.009

89 <.01 <.017 <.011 <.009 <.016 <.010 <.017 <.005 <.002 <.01 <.02 <.009

90 <.01 <.017 <.011 <.009 <.016 <.010 <.017 <.005 <.002 <.01 <.02 <.009
64

ACAD

well no.

(fig. 1)

DOTD

local well

number

USGS site

identification

number

Sample date Aldicarb

sulfone

DP (aldicarb)

1646-88-4

Aldicarb

sulfoxide

DP (aldicarb)

1646-87-3

3-hydroxycarbofuran

 DP 

(carbofuran)

16655-82-6

DDE, p,p′

DP (DDT)

72-55-9

Deethylatrazine

DP (atrazine)

6190-65-4

Deethyldeisopropylatrazine

DP (atrazine)

3397-62-4

Deisopropylatrazine

DP (atrazine)

1007-28-9

31 Be-6084Z 304409093171801 6-06-2000 <0.16 <0.03 <0.06 <0.006 <0.001 <0.06 <0.07

32 Be-5928Z 304140093343502 6-07-2000 <.16 <.03 <.06 <.006 <.001 <.06 <.07

33 Be-6065Z 303153093303201 6-08-2000 <.16 <.03 <.06 <.006 <.001 <.06 <.07

34 Ev-5500Z 303550092252401 7-10-2000 <.16 <.03 <.06 <.006 <.001 <.06 <.07

35 JD-5177Z 301009092554501 7-18-2000 <.16 <.03 <.06 <.006 E.056 <.06 <.07

36 JD-5371Z 300627092464302 7-12-2000 <.16 <.03 <.06 <.006 <.001 <.06 <.07

37 Be-5764Z 305020093003001 7-19-2000 <.16 <.03 <.06 <.006 <.001 <.06 <.07

38 Ac-6896Z 300825092350001 7-21-2000 <.16 <.03 <.06 <.006 <.001 <.06 <.07

39 Be-6077Z 303626093161201 7-26-2000 <.16 <.03 <.06 <.006 <.001 <.06 <.07

40 Al-5243Z 303647092573301 7-27-2000 <.16 <.03 <.06 <.006 <.001 <.06 <.07

41 Ve-7436Z 300718092125801 8-02-2000 <.16 <.03 <.06 <.006 <.001 <.06 <.07

42 Ve- 170 300121092005701 8-03-2000 <.16 <.03 <.06 <.006 <.001 <.06 <.07

43 Cu-7082Z 300816093280501 8-16-2000 <.16 <.03 <.06 <.006 <.001 <.06 <.07

44 V-8701Z 305810093034001 8-17-2000 <.16 <.03 <.06 E.001 <.001 <.06 <.07

45 Ve-9241Z 295640092144801 8-18-2000 <.16 <.03 <.06 <.006 <.001 <.06 <.07

46 Cn-5874Z 300111093101601 9-07-2000 <.16 <.03 <.06 <.006 <.001 <.06 <.07

47 SL-6924Z 303112092034001 9-11-2000 <.16 <.03 <.06 -- -- <.06 <.07

48 R-5964Z 305949092363001 9-19-2000 <.16 <.03 <.06 -- -- <.06 <.07

49 Ac-6998Z 302145092212501 9-26-2000 <.16 <.03 <.06 <.006 -- <.06 <.07

50 JD-5938Z 302109092523101 11-14-2000 <.16 <.03 <.06 <.003 <.007 <.06 <.07

51 Cu-7967Z 301707093223202 11-15-2000 <.16 <.03 <.06 <.003 <.007 <.06 <.07

52 Cu-7410Z 302108093405103 11-21-2000 <.16 <.03 <.06 <.003 <.007 <.06 <.07

53 Ac-6112Z 301947092320101 11-20-2000 <.16 <.03 <.06 <.003 <.007 <.06 <.07

54 Lf-9803Z 301538092021301 11-29-2000 <.16 <.03 <.06 <.003 <.007 <.06 <.07

55 Al-5167Z 304857092363601 12-12-2000 <.16 <.03 <.06 <.003 <.007 <.06 <.07

56 Al-5506Z 304128092450401 12-14-2000 <.16 <.03 <.06 <.003 <.007 <.06 <.07

57 Ac-6512Z 302121092310201 1-10-2001 <.16 <.03 <.06 <.003 <.007 <.06 <.07

58 Ev-5508Z 305150092213101 1-11-2001 <.16 <.03 <.06 <.003 <.007 <.06 <.07

59 Cu-5250Z 302403093084601 1-18-2001 <.16 <.03 <.06 <.003 <.007 <.06 <.07

60 Al-5240Z 303947092534101 2-06-2001 <.16 <.03 <.06 <.003 <.007 <.06 <.07

Appendix 7. Concentrations of pesticide degradation products in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 

2000-2001

[Numbers below the chemical names are the Chemical Abstracts Service (CAS) numbers. All concentrations are in micrograms per liter. ACAD, Acadian-Pontchartrain Study Unit of the National Water Quality 

Assessment Program; DOTD, Louisiana Department of Transportation and Development; USGS, U.S. Geological Survey; DP, degradation product; <, less than; E, estimated; --, no data]
65

Appendix 7. Concentrations of pesticide degradation products in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 

2000-2001—Continued

ACAD

well no.

(fig. 1)

DOTD

local well

number

USGS site

identification

number

Sample date Aldicarb

sulfone

DP (aldicarb)

1646-88-4

Aldicarb

sulfoxide

DP (aldicarb)

1646-87-3

3-hydroxycarbofuran

 DP 

(carbofuran)

16655-82-6

DDE, p,p′

DP (DDT)

72-55-9

Deethylatrazine

DP (atrazine)

6190-65-4

Deethyldeisopropylatrazine

DP (atrazine)

3397-62-4

Deisopropylatrazine

DP (atrazine)

1007-28-9

61 SH-5527Z 305840090393801 2-14-2001 <0.16 <0.03 <0.06 <0.003 <0.007 <0.06 <0.07

62 SH-5460Z 304727090392001 2-15-2001 <.16 <.03 <.06 -- <.07 <.06 <.07

63 EF-5282Z 305130091025701 3-01-2001 <.16 <.03 <.06 <.003 <.007 <.06 <.07

64 EF-5422Z 305834091033701 5-09-2001 <.16 <.03 <.06 <.003 <.007 <.06 <.07

65 ST-6753Z 303032090051701 5-10-2001 <.16 <.03 <.06 <.003 <.007 <.06 <.07

66 ST-8617Z 303623090071601 5-24-2001 <.02 <.008 <.0006 <.003 <.007 <.01 <.04

67 EB-6257Z 304118091055201 6-04-2001 <.02 <.008 <.0006 <.003 <.007 <.01 <.04

68 EF-5348Z 305808091101701 6-14-2001 <.02 <.008 <.0006 <.003 <.007 <.01 <.04

69 EF-5450Z 304811091130701 7-05-2001 <.02 <.008 <.0006 <.003 E.004 <.01 <.04

70 Li-7429Z 303506090554101 6-14-2001 <.02 <.008 <.0006 <.003 E.006 <.01 <.04

71 Li-7282Z 303026090420301 6-20-2001 <.02 <.008 <.0006 <.003 <.007 <.01 <.04

72 Ta-8435Z 303506090184101 6-21-2001 <.02 <.008 <.0006 <.003 <.007 <.01 <.04

73 SH-5344Z 304001090390101 7-05-2001 <.02 <.008 <.0006 <.003 <.007 <.01 <.04

74 Li-7148Z 302608090534101 7-12-2001 <.02 <.008 <.0006 <.003 <.007 <.01 <.04

75 Ta-7292Z 302711090211801 7-19-2001 <.02 <.008 <.0006 <.003 <.007 <.01 <.04

76 Ta- 788 303728090294301 8-02-2001 <.02 <.008 <.0006 <.003 <.007 <.01 <.04

77 Wa-7324Z 305908090140901 7-26-2001 <.02 <.008 <.0006 <.003 <.007 <.01 <.04

78 MS.AM-D016 311613090392001 8-07-2001 <.02 <.008 <.0006 <.003 <.007 <.01 <.04

79 MS.PK-G021 310722090280801 8-08-2001 <.02 <.008 <.0006 <.003 <.007 <.01 <.04

80 ST-6940Z 302725090094101 8-09-2001 <.02 <.008 <.0006 <.003 <.007 <.01 <.04

81 Ta-9622Z 304636090303601 8-16-2001 <.02 <.008 <.0006 <.003 <.007 <.01 <.04

82 EF-5228Z 304727090513901 9-11-2001 <.02 <.008 <.0006 <.003 <.007 <.01 <.04

83 Ta- 815 305750090301101 9-19-2001 <.02 <.008 <.0006 <.003 <.007 <.01 <.04

84 Ta-6551Z 304707090173301 9-20-2001 <.02 <.008 <.0006 <.003 <.007 <.01 <.04

85 Li-6487Z 301959090504201 9-21-2001 <.02 <.008 <.0006 <.003 <.007 <.01 <.04

86 EB-8065Z 302119090550802 9-25-2001 <.02 <.008 <.0006 <.003 <.007 <.01 <.04

87 Li-6203Z 302049090390401 9-25-2001 <.02 <.008 <.0006 <.003 <.007 <.01 <.04

88 WF-5115Z 305013091194001 9-26-2001 <.02 <.008 <.0006 <.003 <.007 <.01 <.04

89 Ta-7401Z 302934090321901 9-27-2001 <.02 <.008 <.0006 <.003 <.007 <.01 <.04

90 MS.AM-M006 310700090520001 9-28-2001 <.02 <.008 <.0006 <.003 <.007 <.01 <.04
66

Appendix 7. Concentrations of pesticide degradation products in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 

2000-2001—Continued

ACAD 

well 

number

(fig. 1)

2,6-diethylaniline

DP (alachlor)

579-66-8

Desulfinylfipronil

DP (fipronil)

no CAS number

Fipronil

RPA

105048

DP (fipronil)

no CAS number

Fipronil 

sulfide

DP (fipronil)

120067-83-6

Fipronil

sulfone

DP (fipronil)

120068-36-2

2-Hydroxyatrazine

DP (atrazine)

2163-68-0

3-Ketocarbofuran

DP (carbofuran)

16709-30-1

Methomyl

oxime

DP (methomyl)

16752-77-5

3-(4-chlorophenyl)-1-methyl 

urea

DP (neburon)

5352-88-5

Oxamyl

oxime

DP (oxamyl)

23135-22-0

31 <0.003 <0.010 <0.005 <0.010 <0.001 <0.193 <0.072 <0.077 <0.092 <0.064

32 <.003 <.010 <.005 <.010 <.001 <.193 <.072 <.077 <.092 <.064

33 <.003 <.010 <.005 <.010 <.001 <.193 <.072 <.077 <.092 <.064

34 <.003 <.010 <.005 <.010 <.001 <.193 <.072 <.077 <.092 <.064

35 <.003 <.010 <.005 <.010 <.001 <.193 <.072 <.077 <.092 <.064

36 <.003 <.010 <.005 <.010 <.001 <.193 <.072 <.077 <.092 <.064

37 <.003 <.010 <.005 <.010 <.001 <.193 <.072 <.077 <.092 <.064

38 <.003 <.010 <.005 <.010 <.001 <.193 <.072 <.077 <.092 <.064

39 <.003 <.010 <.005 <.010 <.001 <.193 <.072 <.077 <.092 <.064

40 <.003 <.010 <.005 <.010 <.001 <.193 <.072 <.077 <.092 <.064

41 <.003 <.010 <.005 <.010 <.001 <.193 <.072 <.077 <.092 <.064

42 <.003 <.010 <.005 <.010 <.001 <.193 <.072 <.077 <.092 <.064

43 <.003 <.010 <.005 <.010 <.001 <.193 <.072 <.077 <.092 <.064

44 <.003 <.010 <.005 <.010 <.001 <.193 <.072 <.077 <.092 <.064

45 <.003 <.010 <.005 <.010 <.001 <.193 <.072 <.077 <.092 <.064

46 <.003 <.010 <.005 <.010 <.001 <.193 <.072 <.077 <.092 <.064

47 -- <.010 <.005 <.010 <.001 <.193 <.072 <.077 <.092 <.064

48 -- <.010 <.005 <.010 <.001 <.193 <.072 <.077 <.092 <.064

49 <.003 <.010 <.005 <.010 <.001 <.193 <.072 <.077 <.092 <.064

50 <.002 <.010 <.005 <.010 <.001 <.193 <.072 <.077 <.092 <.064

51 <.002 <.010 <.005 <.010 <.001 <.193 <.072 <.077 <.092 <.064

52 <.002 <.010 <.005 <.010 <.001 <.193 <.072 <.077 <.092 <.064

53 <.002 <.010 <.005 <.010 <.001 <.193 <.072 <.077 <.092 <.064

54 <.002 <.010 <.005 <.010 <.001 <.193 <.072 <.077 <.092 <.064

55 <.002 <.010 <.005 <.010 <.001 <.193 <.072 <.077 <.092 <.064

56 <.002 <.010 <.005 <.010 <.001 <.193 <.072 <.077 <.092 <.064

57 <.002 -- -- -- -- <.193 <.072 <.077 <.092 <.064

58 <.002 <.010 <.005 <.010 <.001 <.193 <.072 <.077 <.092 <.064

59 <.002 <.010 <.005 <.010 <.001 <.193 <.072 <.077 <.092 <.064

60 <.002 <.010 <.005 <.010 <.001 <.193 <.072 <.077 <.092 <.064
67

Appendix 7. Concentrations of pesticide degradation products in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 

2000-2001—Continued

ACAD 

well 

number

(fig. 1)

2,6-diethyaniline

DP (alachlor)

579-66-8

Desulfinylfipronil

DP (fipronil)

no CAS number

Fipronil

RPA

105048

DP (fipronil)

no CAS number

Fipronil 

sulfide

DP (fipronil)

120067-83-6

Fipronil

sulfone

DP (fipronil)

120068-36-2

2-Hydroxyatrazine

DP (atrazine)

2163-68-0

3-Ketocarbofuran

DP (carbofuran)

16709-30-1

Methomyl

oxime

DP (methomyl)

16752-77-5

3-(4-chlorophenyl)-1-methyl 

urea

DP (neburon)

5352-88-5

Oxamyl

oxime

DP (oxamyl)

23135-22-0

61 <0.002 -- -- -- -- <0.193 <0.072 <0.077 <0.092 <0.064

62 -- -- -- -- -- <.193 <.072 <.077 <.092 <.064

63 <.002 -- -- -- -- <.193 <.072 <.077 <.092 <.064

64 <.002 -- -- -- -- <.193 <.072 <.077 <.092 <.064

65 <.002 -- -- -- -- <.193 <.072 <.077 <.092 <.064

66 <.002 -- -- -- -- <.008 <1.50 <.004 <.024 <.013

67 <.002 -- -- -- -- <.008 <1.50 <.004 <.024 <.013

68 <.002 -- -- -- -- <.008 <1.50 <.004 <.024 <.013

69 <.002 -- -- -- -- <.008 <1.50 <.004 <.024 <.013

70 <.002 -- -- -- -- <.008 <1.50 <.004 <.024 <.013

71 <.002 <0.010 <0.005 <0.010 <0.001 <.008 <1.50 <.004 <.024 <.013

72 <.002 <.010 <.005 <.010 <.001 <.008 <1.50 <.004 <.024 <.013

73 <.002 <.010 <.005 <.010 <.001 <.008 <1.50 <.004 <.024 <.013

74 <.002 <.010 <.005 <.010 <.001 <.008 <1.50 <.004 <.024 <.013

75 <.002 <.010 <.005 <.010 <.001 <.008 <1.50 <.004 <.024 <.013

76 <.002 <.010 <.005 <.010 <.001 <.008 <1.50 <.004 <.001 <.013

77 <.002 <.010 <.005 <.010 <.001 <.008 <1.50 <.004 <.024 <.013

78 <.002 -- -- -- -- <.008 <1.50 <.004 <.024 <.013

79 <.002 -- -- -- -- <.008 <1.50 <.004 <.001 <.013

80 <.002 -- -- -- -- <.008 <1.50 <.004 <.001 <.013

81 <.002 -- -- -- -- <.008 <1.50 <.004 <.024 <.013

82 <.002 -- -- -- -- <.008 <1.50 <.004 <.024 <.013

83 <.002 -- -- -- -- <.008 <1.50 <.004 <.024 <.013

84 <.002 -- -- -- -- <.008 <1.50 <.004 <.024 <.013

85 <.002 -- -- -- -- <.008 <1.50 <.004 <.024 <.013

86 <.002 -- -- -- -- <.008 <1.50 <.004 <.024 <.013

87 <.002 -- -- -- -- <.008 <1.50 <.004 <.024 <.013

88 <.002 -- -- -- -- <.008 <1.50 <.004 <.024 <.013

89 <.002 -- -- -- -- <.008 <1.50 <.004 <.024 <.013

90 <.002 -- -- -- -- <.008 <1.50 <.004 <.024 <.013
68

ACAD 

well 

number

(fig. 1)

DOTD

local well

number

USGS site 

identification 

number

Sample date Acetone

(2-propanone)

67-64-1

Acrylonitrile

(2-propenenitrile)

107-13-1

Benzene

71-43-2

Bromobenzene

108-86-1

Bromochloromethane

74-97-5

Bromodichloromethane 

75-27-4

Bromoethene

(Vinyl bromide)

593-60-2

31 Be-6084Z 304409093171801 6-06-2000 <7 <1 <0.04 <0.04 <0.04 <0.05 <0.1

32 Be-5928Z 304140093343502 6-07-2000 <7 <1 E.01 <.04 <.04 <.05 <.1

33 Be-6065Z 303153093303201 6-08-2000 <7 <1 <.04 <.04 <.04 <.05 <.1

34 Ev-5500Z 303550092252401 7-10-2000 <7 <1 <.04 <.04 <.04 <.05 <.1

35 JD-5177Z 301009092554501 7-18-2000 <7 <1 <.04 <.04 <.04 <.05 <.1

36 JD-5371Z 300627092464302 7-12-2000 <7 <1 <.04 <.04 <.04 <.05 <.1

37 Be-5764Z 305020093003001 7-19-2000 <7 <1 <.04 <.04 <.04 <.05 <.1

38 Ac-6896Z 300825092350001 7-21-2000 <7 <1 <.04 <.04 <.04 <.05 <.1

39 Be-6077Z 303626093161201 7-26-2000 <7 <1 <.04 <.04 <.04 <.05 <.1

40 Al-5243Z 303647092573301 7-27-2000 <7 <1 <.04 <.04 <.04 <.05 <.1

41 Ve-7436Z 300718092125801 8-02-2000 <7 <1 <.04 <.04 <.04 <.05 <.1

42 Ve- 170 300121092005701 8-03-2000 <7 <1 <.04 <.04 <.04 <.05 <.1

43 Cu-7082Z 300816093280501 8-16-2000 <7 <1 <.04 <.04 <.04 <.05 <.1

44 V-8701Z 305810093034001 8-17-2000 <7 <1 <.04 <.04 <.04 <.05 <.1

45 Ve-9241Z 295640092144801 8-18-2000 <7 <1 <.04 <.04 <.04 <.05 <.1

46 Cn-5874Z 300111093101601 9-07-2000 <7 <1 <.04 <.04 <.04 <.05 <.1

47 SL-6924Z 303112092034001 9-11-2000 <7 <1 <.04 <.04 <.04 E.02 <.1

48 R-5964Z 305949092363001 9-19-2000 <7 <1 <.04 <.04 <.04 <.05 <.1

49 Ac-6998Z 302145092212501 9-26-2000 <7 <1 <.04 <.04 <.04 <.05 <.1

50 JD-5938Z 302109092523101 11-14-2000 <7 <1 <.04 <.04 <.04 <.05 <.1

51 Cu-7967Z 301707093223202 11-15-2000 <7 <1 <.04 <.04 <.04 <.05 <.1

52 Cu-7410Z 302108093405103 11-21-2000 <7 <1 <.04 <.04 <.04 <.05 <.1

53 Ac-6112Z 301947092320101 11-20-2000 <7 <1 <.04 <.04 <.04 <.05 <.1

54 Lf-9803Z 301538092021301 11-29-2000 <7 <1 <.04 <.04 <.04 <.05 <.1

55 Al-5167Z 304857092363601 12-12-2000 <7 <1 <.04 <.04 <.04 <.05 <.1

56 Al-5506Z 304128092450401 12-14-2000 <7 <1 <.04 <.04 <.04 <.05 <.1

57 Ac-6512Z 302121092310201 1-10-2001 <7 <1 <.04 <.04 <.04 <.05 <.1

58 Ev-5508Z 305150092213101 1-11-2001 <7 <1 <.04 <.04 <.04 <.05 <.1

59 Cu-5250Z 302403093084601 1-18-2001 <7 <1 <.04 <.04 <.04 <.05 <.1

60 Al-5240Z 303947092534101 2-06-2001 <7 <1 <.04 <.04 <.04 <.05 <.1

Appendix 8. Volatile organic compounds in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001

[Numbers below the chemical names are the Chemical Abstracts Service (CAS) numbers. All concentrations are in micrograms per liter. ACAD, Acadian-Pontchartrain Study Unit of the National Water Quality 

Assessment Program; DOTD, Louisiana Department of Transportation and Development; USGS, U.S. Geological Survey; <, less than; E, estimated]
69

Appendix 8. Volatile organic compounds in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001--Continued

ACAD 

well

 number

(fig. 1)

DOTD

local well

number

USGS site 

identification 

number

Sample date Acetone

(2-propanone)

67-64-1

Acrylonitrile

(2-propenenitrile)

107-13-1

Benzene

71-43-2

Bromobenzene

108-86-1

Bromochloromethane

74-97-5

Bromodichloromethane 

75-27-4

Bromoethene

(Vinyl bromide)

593-60-2

61 SH-5527Z 305840090393801 2/14/2001 <7 <1 E0.03 <0.04 <0.04 <0.05 <0.1

62 SH-5460Z 304727090392001 2/15/2001 <7 <1 <.04 <.04 <.04 <.05 <.1

63 EF-5282Z 305130091025701 3/01/2001 <7 <1 <.04 <.04 <.04 <.05 <.1

64 EF-5422Z 305834091033701 5/09/2001 <7 <1 <.04 <.04 <.04 <.05 <.1

65 ST-6753Z 303032090051701 5/10/2001 <7 <1 <.04 <.04 <.04 <.05 <.1

66 ST-8617Z 303623090071601 5/24/2001 <7 <1 <.04 <.04 <.04 <.05 <.1

67 EB-6257Z 304118091055201 6/04/2001 <7 <1 <.04 <.04 <.04 <.05 <.1

68 EF-5348Z 305808091101701 6/14/2001 <7 <1 <.04 <.04 <.04 <.05 <.1

69 EF-5450Z 304811091130701 7/05/2001 <7 <1 <.04 <.04 <.04 <.05 <.1

70 Li-7429Z 303506090554101 6/14/2001 <7 <1 <.04 <.04 <.04 <.05 <.1

71 Li-7282Z 303026090420301 6/20/2001 <7 <1 <.04 <.04 <.04 <.05 <.1

72 Ta-8435Z 303506090184101 6/21/2001 <7 <1 <.04 <.04 <.04 <.05 <.1

73 SH-5344Z 304001090390101 7/05/2001 <7 <1 <.04 <.04 <.04 <.05 <.1

74 Li-7148Z 302608090534101 7/12/2001 <7 <1 <.04 <.04 <.04 <.05 <.1

75 Ta-7292Z 302711090211801 7/19/2001 <7 <1 <.04 <.04 <.04 <.05 <.1

76 Ta- 788 303728090294301 8/02/2001 <7 <1 <.04 <.04 <.04 <.05 <.1

77 Wa-7324Z 305908090140901 7/26/2001 <7 <1 <.04 <.04 <.04 <.05 <.1

78 MS.AM-D016 311613090392001 8/07/2001 <7 <1 <.04 <.04 <.04 <.05 <.1

79 MS.PK-G021 310722090280801 8/08/2001 <7 <1 <.04 <.04 <.04 <.05 <.1

80 ST-6940Z 302725090094101 8/09/2001 <7 <1 <.04 <.04 <.04 <.05 <.1

81 Ta-9622Z 304636090303601 8/16/2001 <7 <1 E.04 <.04 <.04 <.05 <.1

82 EF-5228Z 304727090513901 9/11/2001 <7 <1 <.04 <.04 <.04 E.06 <.1

83 Ta- 815 305750090301101 9/19/2001 <7 <1 <.04 <.04 <.04 <.05 <.1

84 Ta-6551Z 304707090173301 9/20/2001 <7 <1 <.04 <.04 <.04 <.05 <.1

85 Li-6487Z 301959090504201 9/21/2001 <7 <1 <.04 <.04 <.04 <.05 <.1

86 EB-8065Z 302119090550802 9/25/2001 <7 <1 <.04 <.04 <.04 <.05 <.1

87 Li-6203Z 302049090390401 9/25/2001 <7 <1 <.04 <.04 <.04 <.05 <.1

88 WF-5115Z 305013091194001 9/26/2001 <7 <1 <.04 <.04 <.04 <.05 <.1

89 Ta-7401Z 302934090321901 9/27/2001 <7 <1 <.04 <.04 <.04 <.05 <.1

90 MS.AM-M006 310700090520001 9/28/2001 <7 <1 <.04 <.04 <.04 <.05 <.1
70

Appendix 8. Volatile organic compounds in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001--Continued

ACAD 

well 

number

(fig. 1)

Bromoform

(Tribromomethane)

75-25-2

Bromomethane

(Methyl bromide)

74-83-9

Butylbenzene 

104-51-8

sec-Butylbenzene 

135-98-8

tert-Butylbenzene

98-06-6

Carbon disulfide

75-15-0

Chlorobenzene

108-90-7

Chloroethane

75-00-3

Chloroform

(Trichloromethane)

67-66-3

Chloromethane

(Methyl chloride)

74-87-3

31 <0.06 <0.3 <0.2 <0.03 <0.06 <0.07 <0.03 <0.1 E0.01 <0.5

32 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 <.05 <.5

33 <.06 <.3 <.2 <.03 <.06 E.04 <.03 <.1 <.05 E.1

34 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 <.05 <.5

35 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 <.05 <.5

36 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 <.05 <.5

37 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 E.03 <.5

38 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 <.05 <.5

39 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 <.05 <.5

40 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 E.03 <.5

41 <.06 <.3 <.2 <.03 <.06 E.03 <.03 <.1 <.05 <.5

42 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 <.05 <.5

43 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 E.01 <.5

44 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 <.05 <.5

45 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 <.05 <.5

46 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 <.05 <.5

47 <.06 <.3 <.2 <.03 <.06 E.02 <.03 <.1 0.13 <.5

48 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 E.02 <.5

49 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 <.05 <.5

50 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 <.02 <.2

51 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 <.02 <.2

52 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 <.02 <.2

53 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 <.02 <.2

54 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 <.02 <.2

55 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 <.02 <.2

56 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 E.03 <.2

57 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 <.02 <.2

58 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 0.37 <.2

59 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 <.02 <.2

60 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 <.02 <.2
71

Appendix 8. Volatile organic compounds in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001--Continued

ACAD 

well 

number

(fig. 1)

Bromoform

(Tribromomethane)

75-25-2

Bromomethane

(Methyl bromide)

74-83-9

Butylbenzene 

104-51-8

sec-Butylbenzene 

135-98-8

tert-Butylbenzene

98-06-6

Carbon disulfide

75-15-0

Chlorobenzene

108-90-7

Chloroethane

75-00-3

Chloroform

(Trichloromethane)

67-66-3

Chloromethane

(Methyl chloride)

74-87-3

61 <0.06 <0.3 <0.2 <0.03 <0.06 <0.07 <0.03 <0.1 E0.03 <0.2

62 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 0.18 <.2

63 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 0.28 <.2

64 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 0.21 <.2

65 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 E.04 <.2

66 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 E.05 <.2

67 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 0.90 <.2

68 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 0.71 <.2

69 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 E.05 <.2

70 <.06 <.3 <.2 <.03 <.06 0.26 <.03 <.1 <.02 <.2

71 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 E.07 <.2

72 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 <.02 <.2

73 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 0.26 <.2

74 <.06 <.3 <.2 <.03 <.06 E.08 <.03 <.1 E.01 <.2

75 <.06 <.3 <.2 <.03 <.06 0.81 <.03 <.1 <.02 <.2

76 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 E.02 <.2

77 <.06 <.3 <.2 <.03 <.06 E.04 <.03 <.1 E.02 <.2

78 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 0.20 <.2

79 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 0.26 <.2

80 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 <.02 <.2

81 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 E.04 <.2

82 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 1.60 <.2

83 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 E.04 <.2

84 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 E.02 <.2

85 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 E.03 <.2

86 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 <.02 <.2

87 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 <.02 <.2

88 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 0.29 <.2

89 <.06 <.3 <.2 <.03 <.06 E.02 <.03 <.1 <.02 <.2

90 <.06 <.3 <.2 <.03 <.06 <.07 <.03 <.1 0.14 <.2
72

Appendix 8. Volatile organic compounds in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001--Continued

ACAD 

well 

number

(fig. 1)

3-Chloropropene

107-05-1

2-Chlorotoluene 

95-49-8

4-Chlorotoluene 

106-43-4

Dibromochloromethane

124-48-1

1,2-Dibromo3-chloropropane

96-12-8

1,2-Dibromoethane

106-93-4

Dibromomethane

74-95-3

1,2-Dichlorobenzene

95-50-1

1,3-Dichlorobenzene

541-73-1

1,4-Dichlorobenzene

106-46-7

31 <0.2 <0.04 <0.06 <0.2 <0.2 <0.04 <0.05 <0.05 <0.05 <0.05

32 <.2 <.04 <.06 <.2 <.2 <.04 <.05 <.05 <.05 <.05

33 <.2 <.04 <.06 <.2 <.2 <.04 <.05 <.05 <.05 <.05

34 <.2 <.04 <.06 <.2 <.2 <.04 <.05 <.05 <.05 <.05

35 <.2 <.04 <.06 <.2 <.2 <.04 <.05 <.05 <.05 <.05

36 <.2 <.04 <.06 <.2 <.2 <.04 <.05 <.05 <.05 <.05

37 <.2 <.04 <.06 <.2 <.2 <.04 <.05 <.05 <.05 <.05

38 <.2 <.04 <.06 <.2 <.2 <.04 <.05 <.05 <.05 <.05

39 <.2 <.04 <.06 <.2 <.2 <.04 <.05 <.05 <.05 <.05

40 <.2 <.04 <.06 <.2 <.2 <.04 <.05 <.05 <.05 <.05

41 <.2 <.04 <.06 <.2 <.2 <.04 <.05 <.05 <.05 <.05

42 <.2 <.04 <.06 <.2 <.2 <.04 <.05 <.05 <.05 <.05

43 <.2 <.04 <.06 <.2 <.2 <.04 <.05 <.05 <.05 <.05

44 <.2 <.04 <.06 <.2 <.2 <.04 <.05 <.05 <.05 <.05

45 <.2 <.04 <.06 <.2 <.2 <.04 <.05 <.05 <.05 <.05

46 <.2 <.04 <.06 <.2 <.2 <.04 <.05 <.05 <.05 <.05

47 <.2 <.04 <.06 <.2 <.2 <.04 <.05 <.05 <.05 <.05

48 <.2 <.04 <.06 <.2 <.2 <.04 <.05 <.05 <.05 <.05

49 <.2 <.04 <.06 <.2 <.2 <.04 <.05 <.05 <.05 <.05

50 <.07 <.03 <.06 <.2 <.2 <.04 <.05 <.03 <.03 <.05

51 <.07 <.03 <.06 <.2 <.2 <.04 <.05 <.03 <.03 <.05

52 <.07 <.03 <.06 <.2 <.2 <.04 <.05 <.03 <.03 <.05

53 <.07 <.03 <.06 <.2 <.2 <.04 <.05 <.03 <.03 <.05

54 <.07 <.03 <.06 <.2 <.2 <.04 <.05 <.03 <.03 <.05

55 <.07 <.03 <.06 <.2 <.2 <.04 <.05 <.03 <.03 E.01

56 <.07 <.03 <.06 <.2 <.2 <.04 <.05 <.03 <.03 <.05

57 <.07 <.03 <.06 <.2 <.2 <.04 <.05 <.03 <.03 E.01

58 <.07 <.03 <.06 <.2 <.2 <.04 <.05 <.03 <.03 <.05

59 <.07 <.03 <.06 <.2 <.2 <.04 <.05 <.03 <.03 <.05

60 <.07 <.03 <.06 <.2 <.2 <.04 <.05 <.03 <.03 <.05
73

Appendix 8. Volatile organic compounds in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001--Continued

ACAD 

well 

number

(fig. 1)

3-Chloropropene

107-05-1

2-Chlorotoluene 

95-49-8

4-Chlorotoluene 

106-43-4

Dibromochloromethane

124-48-1

1,2-Dibromo3-chloropropane

96-12-8

1,2-Dibromoethane

106-93-4

Dibromomethane

74-95-3

1,2-Dichlorobenzene

95-50-1

1,3-Dichlorobenzene

541-73-1

1,4-Dichlorobenzene

106-46-7

61 <0.07 <0.03 <0.06 <0.2 <0.2 <0.04 <0.05 <0.03 <0.03 <0.05

62 <.07 <.03 <.06 <.2 <.2 <.04 <.05 <.03 <.03 <.05

63 <.07 <.03 <.06 <.2 <.2 <.04 <.05 <.03 <.03 <.05

64 <.07 <.03 <.06 <.2 <.2 <.04 <.05 <.03 <.03 <.05

65 <.07 <.03 <.06 <.2 <.2 <.04 <.05 <.03 <.03 <.05

66 <.07 <.03 <.06 <.2 <.2 <.04 <.05 <.03 <.03 <.05

67 <.07 <.03 <.06 <.2 <.2 <.04 <.05 <.03 <.03 <.05

68 <.07 <.03 <.06 <.2 <.2 <.04 <.05 <.03 <.03 <.05

69 <.07 <.03 <.06 <.2 <.2 <.04 <.05 <.03 <.03 <.05

70 <.07 <.03 <.06 <.2 <.2 <.04 <.05 <.03 <.03 <.05

71 <.07 <.03 <.06 <.2 <.2 <.04 <.05 <.03 <.03 <.05

72 <.07 <.03 <.06 <.2 <.2 <.04 <.05 <.03 <.03 <.05

73 <.07 <.03 <.06 <.2 <.2 <.04 <.05 <.03 <.03 <.05

74 <.07 <.03 <.06 <.2 <.2 <.04 <.05 <.03 <.03 <.05

75 <.07 <.03 <.06 <.2 <.2 <.04 <.05 <.03 <.03 <.05

76 <.07 <.03 <.06 <.2 <.2 <.04 <.05 <.03 <.03 <.05

77 <.07 <.03 <.06 <.2 <.2 <.04 <.05 <.03 <.03 <.05

78 <.07 <.03 <.06 <.2 <.5 <.04 <.05 <.03 <.03 <.05

79 <.07 <.03 <.06 <.2 <.5 <.04 <.05 <.03 <.03 <.05

80 <.07 <.03 <.06 <.2 <.5 <.04 <.05 <.03 <.03 <.05

81 <.07 <.03 <.06 <.2 <.5 <.04 <.05 <.03 <.03 <.05

82 <.07 <.03 <.06 <.2 <.5 <.04 <.05 <.03 <.03 <.05

83 <.07 <.03 <.06 <.2 <.5 <.04 <.05 <.03 <.03 <.05

84 <.07 <.03 <.06 <.2 <.5 <.04 <.05 <.03 <.03 <.05

85 <.07 <.03 <.06 <.2 <.5 <.04 <.05 <.03 <.03 <.05

86 <.07 <.03 <.06 <.2 <.5 <.04 <.05 <.03 <.03 <.05

87 <.07 <.03 <.06 <.2 <.5 <.04 <.05 <.03 <.03 <.05

88 <.07 <.03 <.06 <.2 <.5 <.04 <.05 <.03 <.03 <.05

89 <.07 <.03 <.06 <.2 <.5 <.04 <.05 <.03 <.03 <.05

90 <.07 <.03 <.06 <.2 <.5 <.04 <.05 <.03 <.03 <.05
74

Appendix 8. Volatile organic compounds in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001--Continued

ACAD 

well 

number

(fig. 1)

trans-1,4-

Dichloro-2-butene

110-57-6

Dichlorodifluoromethane

75-71-8

1,1-

Dichloroethane

75-34-3

1,2-

Dichloroethane

107-06-2

1,1-

Dichloroethylene 

75-35-4

cis-1,2-

Dichloroethylene

156-59-2

trans-1,2-

Dichloroethylene

156-60-5

Dichloromethane

(Methylene

chloride)

75-09-2

1,2-

Dichloropropane

78-87-5

1,3-

Dichloropropane

142-28-9

31 <0.7 <0.27 <0.07 <0.1 <0.04 <0.04 <0.03 <0.4 <0.07 <0.1

32 <.7 <.27 <.07 <.1 <.04 <.04 <.03 <.4 <.07 <.1

33 <.7 <.27 <.07 <.1 <.04 <.04 <.03 <.4 <.07 <.1

34 <.7 <.27 <.07 <.1 <.04 <.04 <.03 <.4 <.07 <.1

35 <.7 <.27 <.07 <.1 <.04 <.04 <.03 <.4 <.07 <.1

36 <.7 <.27 <.07 <.1 <.04 <.04 <.03 <.4 <.07 <.1

37 <.7 <.27 <.07 <.1 <.04 <.04 <.03 <.4 <.07 <.1

38 <.7 <.27 <.07 <.1 <.04 <.04 <.03 <.4 <.07 <.1

39 <.7 <.27 <.07 <.1 <.04 <.04 <.03 <.4 <.07 <.1

40 <.7 <.27 <.07 <.1 <.04 <.04 <.03 <.4 <.07 <.1

41 <.7 <.27 <.07 <.1 <.04 <.04 <.03 <.4 <.07 <.1

42 <.7 <.27 <.07 <.1 <.04 <.04 <.03 <.4 <.07 <.1

43 <.7 <.27 <.07 <.1 <.04 <.04 <.03 <.4 <.07 <.1

44 <.7 <.27 <.07 <.1 <.04 <.04 <.03 <.4 <.07 <.1

45 <.7 <.27 <.07 <.1 <.04 <.04 <.03 <.4 <.07 <.1

46 <.7 <.27 <.07 <.1 <.04 <.04 <.03 <.4 <.07 <.1

47 <.7 <.27 <.07 <.1 <.04 <.04 <.03 <.4 <.07 <.1

48 <.7 <.27 <.07 <.1 <.04 <.04 <.03 <.4 <.07 <.1

49 <.7 <.27 <.07 <.1 <.04 <.04 <.03 <.4 <.07 <.1

50 <.7 <.27 <.04 <.1 <.04 <.04 <.03 <.2 <.03 <.1

51 <.7 <.27 <.04 <.1 <.04 <.04 <.03 <.2 <.03 <.1

52 <.7 <.27 <.04 <.1 <.04 <.04 <.03 <.2 <.03 <.1

53 <.7 <.27 <.04 <.1 <.04 <.04 <.03 <.2 <.03 <.1

54 <.7 <.27 <.04 <.1 <.04 <.04 <.03 E.1 <.03 <.1

55 <.7 <.27 <.04 <.1 <.04 <.04 <.03 <.2 <.03 <.1

56 <.7 <.27 <.04 <.1 <.04 <.04 <.03 <.2 <.03 <.1

57 <.7 <.27 <.04 <.1 <.04 <.04 <.03 <.2 <.03 <.1

58 <.7 <.27 <.04 <.1 <.04 <.04 <.03 <.2 <.03 <.1

59 <.7 <.27 <.04 <.1 <.04 <.04 <.03 <.2 <.03 <.1

60 <.7 <.27 <.04 <.1 <.04 <.04 <.03 <.2 <.03 <.1
75

Appendix 8. Volatile organic compounds in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001--Continued

ACAD 

well 

number

(fig. 1)

trans-1,4-

Dichloro-2-butene

110-57-6

Dichlorodifluoromethane

75-71-8

1,1-

Dichloroethane

75-34-3

1,2-

Dichloroethane

107-06-2

1,1-

Dichloroethylene 

75-35-4

cis-1,2-

Dichloroethylene

156-59-2

trans-1,2-

Dichloroethylene

156-60-5

Dichloromethane

(Methylene

chloride)

75-09-2

1,2-

Dichloropropane

78-87-5

1,3-

Dichloropropane

142-28-9

61 <0.7 <0.27 <0.04 <0.1 <0.04 <0.04 <0.03 <0.2 <0.03 <0.1

62 <.7 <.27 <.04 <.1 <.04 <.04 <.03 <.2 <.03 <.1

63 <.7 <.27 <.04 <.1 <.04 <.04 <.03 <.2 <.03 <.1

64 <.7 <.27 <.04 <.1 <.04 <.04 <.03 <.2 <.03 <.1

65 <.7 <.27 <.04 <.1 <.04 <.04 <.03 <.2 <.03 <.1

66 <.7 E.18 <.04 <.1 <.04 <.04 <.03 <.2 <.03 <.1

67 <.7 <.27 <.04 <.1 <.04 <.04 <.03 E.04 <.03 <.1

68 <.7 <.27 <.04 <.1 <.04 <.04 <.03 <.2 <.03 <.1

69 <.7 <.27 <.04 <.1 <.04 <.04 <.03 <.2 <.03 <.1

70 <.7 <.27 <.04 <.1 <.04 <.04 <.03 <.2 <.03 <.1

71 <.7 <.27 <.04 <.1 <.04 <.04 <.03 <.2 <.03 <.1

72 <.7 <.27 <.04 <.1 <.04 <.04 <.03 <.2 <.03 <.1

73 <.7 <.27 <.04 <.1 <.04 <.04 <.03 <.2 <.03 <.1

74 <.7 <.27 <.04 <.1 <.04 <.04 <.03 <.2 <.03 <.1

75 <.7 <.27 <.04 <.1 <.04 <.04 <.03 <.2 <.03 <.1

76 <.7 <.27 <.04 <.1 <.04 <.04 <.03 <.2 <.03 <.1

77 <.7 <.27 <.04 <.1 <.04 <.04 <.03 <.2 <.03 <.1

78 <.7 <.27 <.04 <.1 <.04 <.04 <.03 <.2 <.03 <.1

79 <.7 <.27 <.04 <.1 <.04 <.04 <.03 <.2 <.03 <.1

80 <.7 <.27 <.04 <.1 <.04 <.04 <.03 <.2 <.03 <.1

81 <.7 <.27 <.04 <.1 <.04 <.04 <.03 <.2 <.03 <.1

82 <.7 <.27 <.04 <.1 <.04 <.04 <.03 <.2 <.03 <.1

83 <.7 E.34 <.04 <.1 <.04 <.04 <.03 <.2 <.03 <.1

84 <.7 <.27 <.04 <.1 <.04 <.04 <.03 <.2 <.03 <.1

85 <.7 <.27 <.04 <.1 <.04 <.04 <.03 <.2 <.03 <.1

86 <.7 <.27 <.04 <.1 <.04 <.04 <.03 <.2 <.03 <.1

87 <.7 <.27 <.04 <.1 <.04 <.04 <.03 <.2 <.03 <.1

88 <.7 <.27 <.04 <.1 <.04 <.04 <.03 <.2 <.03 <.1

89 <.7 <.27 <.04 <.1 <.04 <.04 <.03 <.2 <.03 <.1

90 <.7 <.27 <.04 <.1 <.04 <.04 <.03 <.2 <.03 <.1
76

Appendix 8. Volatile organic compounds in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001--Continued

ACAD 

well 

number

(fig. 1)

2,2-

Dichloropropane

594-20-7

1,1-

Dichloropropene

563-58-6

cis-1,3-

Dichloropropene

10061-01-5

trans-1,3-

Dichloropropene

10061-02-6

Diethyl

ether

60-29-7

Diisopropyl

ether 

108-20-3

Ethylbenzene

100-41-4

Ethyl tert-butyl

ether

(ETBE)

637-92-3

Ethyl

methacrylate

97-63-2

o-Ethyl

toluene

611-14-3

31 <0.05 <0.03 <0.09 <0.09 <0.2 <0.1 <0.03 <0.05 <0.2 <0.06

32 <.05 <.03 <.09 <.09 <.2 <.1 E.04 <.05 <.2 E.02

33 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

34 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

35 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

36 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

37 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

38 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

39 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

40 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

41 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

42 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

43 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

44 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

45 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

46 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

47 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

48 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

49 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

50 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

51 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

52 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

53 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

54 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

55 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

56 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

57 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

58 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

59 <.05 <.03 <.09 <.09 <.2 -- <.03 <.05 <.2 <.06

60 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06
77

Appendix 8. Volatile organic compounds in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001--Continued

ACAD 

well 

number

(fig. 1)

2,2-

Dichloropropane

594-20-7

1,1-

Dichloropropene

563-58-6

cis-1,3-

Dichloropropene

10061-01-5

trans-1,3-

Dichloropropene

10061-02-6

Diethyl

ether

60-29-7

Diisopropyl

ether 

108-20-3

Ethylbenzene

100-41-4

Ethyl tert-butyl

ether

(ETBE)

637-92-3

Ethyl

methacrylate

97-63-2

o-Ethyl

toluene

611-14-3

61 <0.05 <0.03 <0.09 <0.09 <0.2 <0.1 <0.03 <0.05 <0.2 <0.06

62 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

63 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

64 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

65 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

66 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

67 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

68 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

69 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

70 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

71 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

72 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

73 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

74 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

75 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

76 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

77 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

78 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

79 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

80 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

81 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

82 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

83 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

84 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

85 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

86 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

87 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

88 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

89 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06

90 <.05 <.03 <.09 <.09 <.2 <.1 <.03 <.05 <.2 <.06
78

Appendix 8. Volatile organic compounds in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001--Continued

ACAD 

well 

number

(fig. 1)

Hexachlorobutadiene

87-68-3

Hexachloroethane

67-72-1

2-Hexanone

(Methyl butyl 

ketone)

591-78-6

Isopropylbenzene

98-82-8

4-Isopropyl-1-methylbenzene

(p-Isopropyltoluene)

99-87-6

Methyl

acrylate 

96-33-3

Methyl

acrylonitrile

126-98-7

Methyl

tert-butyl

ether

(MTBE)

1634-04-4

2-Butanone

(Methyl

ethyl

keton)

78-93-3

31 <0.1 <0.2 <0.7 <0.03 <0.07 <1.4 <0.6 <0.2 <1.6

32 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

33 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

34 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

35 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

36 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

37 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

38 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

39 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

40 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

41 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

42 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

43 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

44 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

45 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

46 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

47 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

48 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

49 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

50 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

51 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

52 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

53 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

54 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

55 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

56 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

57 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

58 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

59 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

60 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6
79

Appendix 8. Volatile organic compounds in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001--Continued

ACAD 

well 

number

(fig. 1)

Hexachlorobutadiene

87-68-3

Hexachloroethane

67-72-1

2-Hexanone 

(Methyl butyl 

ketone)

591-78-6

Isopropylbenzene

98-82-8

4-Isopropyl-1-methylbenzene

(p-Isopropyltoluene)

99-87-6

Methyl

acrylate 

96-33-3

Methyl

acrylonitrile

126-98-7

Methyl

tert-butyl

ether

(MTBE)

1634-04-4

2-Butanone

(Methyl

ethyl

keton)

78-93-3

61 <0.1 <0.2 <0.7 <0.03 <0.07 <1.4 <0.6 0.4 <1.6

62 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

63 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

64 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

65 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

66 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

67 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

68 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

69 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

70 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 70

71 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

72 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

73 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

74 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

75 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

76 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

77 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

78 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

79 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

80 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

81 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 0.3 <1.6

82 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

83 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

84 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

85 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

86 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

87 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

88 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

89 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6

90 <.1 <.2 <.7 <.03 <.07 <1.4 <.6 <.2 <1.6
80

Appendix 8. Volatile organic compounds in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001--Continued

ACAD 

well 

number

(fig. 1)

Methyl

iodide

(Iodomethane)

74-88-4

4-Methyl-2-pentanone

(Methyl isobutyl 

ketone)

108-10-1

Methyl

methacrylate

80-62-6

tert-Pentyl

methyl

ether

994-05-8

Naphthalene

91-20-3

n-Propylbenzene

103-65-1

Styrene

(Ethenylbenzene)

100-42-5

1,1,1,2-

Tetrachloroethane

630-20-6

1,1,2,2-

Tetrachloroethane

79-34-5

Tetrachloroethylene

127-18-4

31 <0.1 <0.4 <0.3 <0.1 <0.2 <0.04 <0.04 <0.03 <0.09 <0.1

32 <.1 <.4 <.3 <.1 .3 <.04 <.04 <.03 <.09 <.1

33 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

34 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

35 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

36 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

37 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

38 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

39 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

40 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

41 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

42 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

43 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

44 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

45 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

46 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

47 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

48 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

49 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

50 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

51 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

52 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

53 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

54 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

55 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

56 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

57 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

58 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

59 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

60 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1
81

Appendix 8. Volatile organic compounds in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001--Continued

ACAD 

well 

number

(fig. 1)

Methyl

iodide

(Iodomethane)

74-88-4

4-Methyl-2-pentanone

(Methyl isobutyl 

ketone)

108-10-1

Methyl

methacrylate

80-62-6

tert-Pentyl

methyl

ether

994-05-8

Naphthalene

91-20-3

n-Propylbenzene 

103-65-1

Styrene

(Ethenylbenzene)

100-42-5

1,1,1,2-

Tetrachloroethane

630-20-6

1,1,2,2-

Tetrachloroethane

79-34-5

Tetrachloroethylene

127-18-4

61 <0.1 <0.4 <0.3 E0.03 <0.2 <0.04 <0.04 <0.03 <0.09 <0.1

62 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

63 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

64 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

65 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

66 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

67 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

68 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

69 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

70 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

71 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

72 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

73 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

74 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

75 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

76 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

77 <.1 <.4 <.3 <.1 <.2 <.04 <.04 <.03 <.09 <.1

78 <.1 <.4 <.3 <.1 <.5 <.04 <.04 <.03 <.09 <.1

79 <.1 <.4 <.3 <.1 <.5 <.04 <.04 <.03 <.09 <.1

80 <.1 <.4 <.3 <.1 <.5 <.04 <.04 <.03 <.09 <.1

81 <.1 <.4 <.3 <.1 <.5 <.04 <.04 <.03 <.09 <.1

82 <.1 <.4 <.3 <.1 <.5 <.04 <.04 <.03 <.09 <.1

83 <.1 <.4 <.3 <.1 <.5 <.04 <.04 <.03 <.09 <.1

84 <.1 <.4 <.3 <.1 <.5 <.04 <.04 <.03 <.09 <.1

85 <.1 <.4 <.3 <.1 <.5 <.04 <.04 <.03 <.09 <.1

86 <.1 <.4 <.3 <.1 <.5 <.04 <.04 <.03 <.09 <.1

87 <.1 <.4 <.3 <.1 <.5 <.04 <.04 <.03 <.09 <.1

88 <.1 <.4 <.3 <.1 <.5 <.04 <.04 <.03 <.09 <.1

89 <.1 <.4 <.3 <.1 <.5 <.04 <.04 <.03 <.09 <.1

90 <.1 <.4 <.3 <.1 <.5 <.04 <.04 <.03 <.09 <.1
82

Appendix 8. Volatile organic compounds in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001--Continued

ACAD 

well 

number

(fig. 1)

Tetrachloromethane

56-23-5

Tetrahydrofuran

109-99-9

1,2,3,4-

Tetramethylbenzene

(Prehnitene)

488-23-3

1,2,3,5-

Tetramethylbenzene

(Isodurene) 

527-53-7

1,2,3-

Trichlorobenzene

87-61-6

1,2,4-

Trichlorobenzene

120-82-1

1,1,1-

Trichloroethane

71-55-6

1,1,2-

Trichloroethane

79-00-5

Trichloroethylene

(TCE)

79-01-6

31 <0.06 <2 <0.2 <0.2 <0.3 <0.2 <0.03 <0.06 <0.04

32 <.06 <2 <.2 E.02 <.3 <.2 <.03 <.06 <.04

33 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

34 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

35 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

36 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

37 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

38 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

39 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

40 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

41 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

42 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

43 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

44 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

45 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

46 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

47 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

48 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

49 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

50 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

51 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

52 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

53 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

54 <.06 E1 <.2 <.2 <.3 <.2 <.03 <.06 <.04

55 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

56 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

57 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 E.02

58 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 0.11

59 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 E.03

60 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 E.02
83

Appendix 8. Volatile organic compounds in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001--Continued

ACAD 

well 

number

(fig. 1)

Tetrachloromethane

56-23-5

Tetrahydrofuran

109-99-9

1,2,3,4-

Tetramethylbenzene

(Prehnitene)

488-23-3

1,2,3,5-

Tetramethylbenzene

(Isodurene) 

527-53-7

1,2,3-

Trichlorobenzene

87-61-6

1,2,4-

Trichlorobenzene

120-82-1

1,1,1-

Trichloroethane

71-55-6

1,1,2-

Trichloroethane

79-00-5

Trichloroethylene

(TCE)

79-01-6

61 <0.06 <2 <0.2 <0.2 <0.3 <0.2 <0.03 <0.06 <0.04

62 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

63 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

64 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

65 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

66 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

67 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

68 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

69 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

70 <.06 29 <.2 <.2 <.3 <.2 <.03 <.06 <.04

71 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

72 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

73 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

74 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

75 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

76 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

77 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

78 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

79 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

80 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

81 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

82 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

83 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

84 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

85 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

86 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 E.02

87 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

88 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04

89 <.06 E.616 <.2 <.2 <.3 <.2 <.03 <.06 <.04

90 <.06 <2 <.2 <.2 <.3 <.2 <.03 <.06 <.04
84

Appendix 8. Volatile organic compounds in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001--Continued

ACAD 

well 

number

(fig. 1)

Trichlorofluoromethane

75-69-4

1,2,3-

Trichloropropane

96-18-4

1,1,2-

Trichlorotrifluoroethane

(Freon 113)

76-13-1

1,2,3-

Trimethylbenzene

526-73-8

1,2,4-

Trimethylbenzene

95-63-6

1,3,5-

Trimethylbenzene

108-67-8

Toluene

108-88-3

Vinyl

chloride

75-01-4

m- and pXylene

no CAS number

o-Xylene

95-47-6

31 <0.09 <0.16 <0.06 <0.1 <0.06 <0.04 E0.01 <0.1 <0.06 <0.04

32 <.09 <.16 <.06 E.02 E.10 E.02 E.07 <.1 E.12 E.06

33 <.09 <.16 <.06 <.1 <.06 <.04 E.01 <.1 <.06 <.04

34 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

35 E1.33 <.16 <.06 <.1 <.06 <.04 E.01 <.1 <.06 <.04

36 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

37 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

38 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

39 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

40 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

41 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

42 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

43 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

44 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

45 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

46 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

47 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

48 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

49 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

50 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

51 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

52 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

53 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

54 <.09 <.16 <.06 <.1 E.02 <.04 <.05 <.1 E.01 <.04

55 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

56 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

57 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

58 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

59 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

60 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04
85

Appendix 8. Volatile organic compounds in water from selected domestic wells in southern Louisiana and southwestern Mississippi, 2000-2001--Continued

ACAD 

well 

number

(fig. 1)

Trichlorofluoromethane

75-69-4

1,2,3-

Trichloropropane

96-18-4

1,1,2-

Trichlorotrifluoroethane

(Freon 113)

76-13-1

1,2,3-

Trimethylbenzene

526-73-8

1,2,4-

Trimethylbenzene

95-63-6

1,3,5-

Trimethylbenzene

108-67-8

Toluene

108-88-3

Vinyl

chloride

75-01-4

m- and pXylene

no CAS number

o-Xylene

95-47-6

61 <0.09 <0.16 <0.06 <0.1 <0.06 <0.04 E0.02 <0.1 <0.06 <0.04

62 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

63 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

64 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

65 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

66 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

67 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

68 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

69 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

70 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

71 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

72 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

73 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

74 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

75 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

76 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

77 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

78 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

79 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

80 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

81 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

82 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

83 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

84 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

85 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

86 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

87 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

88 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

89 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04

90 <.09 <.16 <.06 <.1 <.06 <.04 <.05 <.1 <.06 <.04