U.S. Department of the Interior

U.S. Geological Survey

Data Series 580

In cooperation with the Lone Star Groundwater Conservation District

Groundwater Environmental Tracer Data Collected from 

the Chicot, Evangeline, and Jasper Aquifers in Montgomery 

County and Adjacent Counties, Texas, 2008
Front cover:

Top left, CFC-11 (trichlorofluoromehtane) molecule.

Bottom left, Sulfur hexafluoride molecule.

Middle, U.S. Geoligical Survey scientist collects a sample for CFC analysis (in bucket). 

Right, Hydrogen isotope, tritium (3H).
Groundwater Environmental Tracer Data 

Collected from the Chicot, Evangeline, and 

Jasper Aquifers in Montgomery County and 

Adjacent Counties, Texas, 2008

By Timothy D. Oden

In cooperation with the Lone Star Groundwater Conservation District

Data Series 580

U.S. Department of the Interior

U.S. Geological Survey
U.S. Department of the Interior

KEN SALAZAR, Secretary

U.S. Geological Survey

Marcia K. McNutt, Director

U.S. Geological Survey, Reston, Virginia: 2011

This and other USGS information products are available at http://store.usgs.gov/

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Although this report is in the public domain, permission must be secured from the individual copyright owners to 

reproduce any copyrighted materials contained within this report.

Suggested citation:

Oden, T.D., 2011, Groundwater environmental tracer data collected from the Chicot, Evangeline, and Jasper aquifers 

in Montgomery County and adjacent counties, Texas, 2008: U.S. Geological Survey Data Series 580, 37 p.
iii

Contents

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

Introduction ....................................................................................................................................................1

Purpose and Scope .............................................................................................................................1

Description of Study Area ..................................................................................................................1

Hydrogeologic Setting ........................................................................................................................3

Methods ..........................................................................................................................................................3

Sample Collection ................................................................................................................................3

Analytical Methods ..............................................................................................................................6

Quality Control ......................................................................................................................................6

Groundwater Environmental Tracer Data .................................................................................................6

Summary .........................................................................................................................................................6

References Cited ...........................................................................................................................................7

Appendixes 

1. Well-construction information for groundwater wells sampled in the Chicot, 

Evangeline, and Jasper aquifers in Montgomery County and adjacent counties, 

Texas, 2008 ..................................................................................................................................10

2. Physicochemical data measured in groundwater samples collected from the 

Chicot, Evangeline, and Jasper aquifers in Montgomery County and adjacent 

counties, Texas, 2008 .................................................................................................................18

3. Dissolved-gas concentrations measured in groundwater samples collected from 

the Chicot, Evangeline, and Jasper aquifers in Montgomery County and adjacent 

counties, Texas, 2008 .................................................................................................................20

4. Sulfur hexafluoride and chlorofluorocarbons measured in groundwater samples 

collected from the Chicot, Evangeline, and Jasper aquifers in Montgomery County 

and adjacent counties, Texas, 2008 ........................................................................................23

5. Tritium measured in groundwater samples collected from the Chicot, Evangeline, 

and Jasper aquifers in Montgomery County and adjacent counties, Texas, 2008 .........28

6. Helium-4 measured in groundwater samples collected from the Chicot, Evangeline, 

and Jasper aquifers in Montgomery County and adjacent counties, Texas, 2008 .........30

7. Helium, tritium, and neon measured in groundwater samples collected from the 

Chicot, Evangeline, and Jasper aquifers in Montgomery County and adjacent 

county, Texas, 2008 ....................................................................................................................32

Figures

1. Map showing locations of wells sampled during March–September 2008 in 

Montgomery County and adjacent counties, Texas ..............................................................2

2. Hydrogeologic section of the Gulf Coast aquifer system in Montgomery and Harris 

Counties, Texas ............................................................................................................................4

Table

1. Geologic and hydrostratigraphic units of the Gulf Coast aquifer system in 

Montgomery County and adjacent counties, Texas. ..............................................................5
iv

Conversion Factors, Datums, and Water-Quality Units

Inch/Pound to SI

Multiply By To obtain

Length

inch (in.) 2.54 centimeter (cm)

inch (in.) 25.4 millimeter (mm)

foot (ft) 0.3048 meter (m)

mile (mi) 1.609 kilometer (km)

Radioactivity

picocurie per liter (pCi/L) 0.037 Becquerel per liter (Bq/L) 

picocurie per liter (pCi/L) 0.313 Tritium units (TU)

Temperature in degrees Celsius (°C) may be converted to degrees Fahrenheit (°F) as follows:

°F=(1.8×°C)+32

Datums

Vertical coordinate information is referenced to the National Geodetic Vertical Datum of 1929 

(NGVD 29) and North American Vertical Datum of 1988 (NAVD 88).

Horizontal coordinate information is referenced to the North American Datum of 1927 (NAD 27).

Altitude, as used in this report, refers to distance above the vertical datum.

Water-Quality Units

Specific conductance is given in microsiemens per centimeter at 25 degrees Celsius (μS/cm).

Concentrations of chemical constituents in water are given either in milligrams per liter (mg/L), 

femtograms per kilogram (fg/kg), picograms per kilogram (pg/kg), picocuries per liter (pCi/L), 

cubic centimeters per gram at standard temperature and pressure water (cc/g STP H2

O), and 

tritium units (TU).
Abstract 

The Gulf Coast aquifer system is the primary water supply for Montgomery County in southeastern Texas, including part of the Houston metropolitan area and the cities of 

Magnolia, Conroe, and The Woodlands Township, Texas. 

The U.S. Geological Survey, in cooperation with the Lone 

Star Groundwater Conservation District, collected environmental tracer data in the Gulf Coast aquifer system, primarily 

in Montgomery County. Forty existing groundwater wells 

screened in the Gulf Coast aquifer system were selected for 

sampling in Montgomery County (38 wells), Waller County 

(1 well), and Walker County (1 well). Groundwater-quality 

samples, physicochemical properties, and water-level data 

were collected once from each of the 40 wells during March–

September 2008. Groundwater-quality samples were analyzed 

for dissolved gases and the environmental tracers sulfur 

hexafluoride, chlorofluorocarbons, tritium, helium-4, and 

helium-3/tritium. Water samples were collected and processed 

onsite using methods designed to minimize changes to the 

water-sample chemistry or contamination from the atmosphere. Replicate samples for quality assurance and quality 

control were collected with each environmental sample. Wellconstruction information and environmental tracer data for 

March–September 2008 are presented. 

Introduction

Between 2000 and 2010, the population of the Houston, 

Tex., metropolitan area increased 26 percent, and in 2010 

the population of the Houston area, which includes Harris, 

Montgomery, Fort Bend, and Galveston Counties, was about 

5.9 million people (Texas State Data Center, 2010). Much of 

the growth has been to the north of Houston. Municipal and 

industrial water supplies are needed to support population 

growth in the newly developed areas, including historically 

predominately rural Montgomery County, where groundwater withdrawals have increased since 1980 (Texas Water 

Development Board, 2011). The Lone Star Groundwater 

Conservation District (LSGCD) was created in 2001 by 

the 77th Texas Legislature and was charged with managing 

and protecting the groundwater resources of Montgomery 

County. The LSGCD has worked cooperatively with the U.S. 

Geological Survey (USGS) to monitor and appraise the Gulf 

Coast aquifer system, comprised of the Chicot, Evangeline, 

and Jasper aquifers, Burkeville confining unit, and Catahoula 

Sandstone. Annual groundwater-level measurements are 

recorded and periodic groundwater-level change maps are 

produced to provide short-term and long-term trends of the 

effects of groundwater withdrawal on the regional aquifer 

flow system. In 2003, the LSGCD set a maximum amount of 

sustainable yield for the Gulf Coast aquifer in Montgomery 

County equal to previously determined estimates of recharge. 

In 2007, as the LSGCD began planning for an alternative 

source of water to curtail groundwater withdrawals, the 

LSGCD required more detailed information on the rate of 

groundwater recharge to evaluate whether there is a consistent recharge value across Montgomery County and vertically 

within the aquifer system.

Purpose and Scope

This report presents the well-construction and waterquality data (environmental tracers) from discrete groundwater samples collected during March–September 2008 in 

Montgomery, Waller, and Walker Counties, Tex. Methods 

used to select sites and techniques used to collect and analyze 

the water-quality data are described. This report complements 

previous USGS investigations in the Gulf Coast aquifer system 

as described in Noble and others (1996) and Nolan and others 

(2007).

Description of Study Area

Most of the wells sampled were in Montgomery County 

in southeastern Texas, which includes part of the Houston metropolitan area and the municipalities of Magnolia, Conroe, and 

The Woodlands Township (Texas State Data Center, 2010). 

Of 40 existing groundwater wells from which samples were 

collected, 38 were in Montgomery County, 1 was in Waller 

County, and 1 was in Walker County (fig. 1). Montgomery 

Groundwater Environmental Tracer Data Collected 

from the Chicot, Evangeline, and Jasper Aquifers in 

Montgomery County and Adjacent Counties, Texas, 2008

By Timothy D. Oden 
2 Groundwater Environmental Tracer Data Collected from the Chicot, Evangeline, and Jasper Aquifers

Figure 1. Locations of wells sampled during March–September 2008 in Montgomery County and adjacent counties, Texas. 

Brazos

Spring

Creek

Caney

Creek

West

Fork

San

Jacinto

River

West Fork

San

Jacinto

River

River

Lake

Creek

Lake

Creek

105

45

249

59

150

30

90

19

6

Loop 336

105

290

45

156

45

190

75

30

1488

1774

LAKE

HOUSTON

LAKE

CONROE

LAKE

LIVINGSTON

TS–60–53–720

TS–60–53–719

TS–60–44–805

TS–60–44–806

TS–60–54–807

TS–60–35–503

TS–60–26–901

TS–60–45–513

TS–60–34–301

YW–59–64–206 TS–60–63–110

TS–60–37–309

TS–60–54–702

TS–60–44–212

TS–60–55–710

YU–60–28–802

TS–60–45–114

TS–60–53–210

TS–60–43–514

TS–60–51–5xx

TS–60–52–1xx

TS–60–51–8XXB

TS–60–42–902

TS–60–53–516

TS–60–36–410

TS–60–35–907 TS–60–37–806

TS–60–37–909

TS–60–59–102

TS–60–51–809

TS–60–45–414

TS–60–45–413

TS–60–54–80 TS–60–54–805 6

TS–60–35–504

TS–60–35–505

TS–60–26–208

TS–60–43–511

TS–60–45–716

TS–60–51–8XXA

Magnolia

The 

Woodlands

Conroe

WALKER COUNTY

SAN JACINTO COUNTY

GRIMES COUNTY

MONTGOMERY COUNTY

WALLER COUNTY

LIBERTY

COUNTY

HARRIS COUNTY

AUSTIN

WASHINGTON

COUNTY

BRAZOS COUNTY

COUNTY

POLK

COUNTY

TEXAS

Study 

area Houston

LOCATION MAP

0 10 20 MILES

0 10 20 KILOMETERS

Base modified from U.S. Geological Survey, 

1:100,000-scale digital data 

Universal Transverse Mercator projection 

Zone 15, North American Datum of 1927

96°15' 96°00' 95°45' 95°30' 95°15'

30°45'

30°30'

30°15'

30°00'

EXPLANATION

Monitor well, by aquifer from which

samples were obtained—Number 

is State well number (appendix 1)

Chicot

Evangeline

Jasper

TS–60–59–102

TS–60–51–809

TS–60–36–410
Methods 3

County is forecasted to be one of the fastest growing counties 

in the Houston area, more than doubling its 2000 population 

of 373,000 by 2035 (Houston-Galveston Area Council, 2006). 

This rapid increase of population will likely result in appreciable land-use changes and a more suburban and urban land 

use, with a subsequent increased water demand. The topography of Montgomery County ranges from essentially flat near 

the larger streams and coastward to undulating rolling hills in 

the northern part of the county. Land-surface altitude ranges 

from about 79 feet (ft) above North American Vertical Datum 

of 1988 (NAVD 88) in the southeastern corner of the county 

to about 330 ft above NAVD 88 in the northwestern corner 

(U.S. Department of Agriculture, 1972). Montgomery County 

is entirely within the San Jacinto River drainage basin, which 

trends from the northwest to the southeast. Lake Conroe, a 

reservoir completed in 1973, is at the upper end of the West 

Fork San Jacinto River (fig. 1). Montgomery County has a 

humid subtropical climate characterized by hot and humid 

summers and cool winters. For the period 1947–2008, the 

average precipitation in the Houston area was 51.67 inches per 

year (National Climatic Data Center, 2010). During the last 

61 years, many periods of drought have occurred (National 

Climatic Data Center, 2010).

Hydrogeologic Setting

The Gulf Coast aquifer system in Montgomery County 

consists of the Chicot aquifer, Evangeline aquifer, Burkeville 

confining unit, Jasper aquifer, and the underlying Catahoula 

Sandstone (table 1). The uppermost Chicot aquifer consists of 

Pleistocene- and Holocene-age unconsolidated sand, silt, and 

clay sediments; the Evangeline aquifer consists of Mioceneand Pliocene-age unconsolidated sand, silt, and clay sediments, and the lowermost Jasper aquifer consists of Mioceneage unconsolidated sand, silt, and clay sediments (Baker, 

1979). The Jasper aquifer is separated from the Evangeline 

aquifer by the Burkeville confining unit. The Catahoula 

sandstone consists of Miocene- and Oligocene-age sediments 

at the base of the Gulf Coast aquifer system and contains 

small amounts of freshwater in shallow restricted sands near 

the outcrop area to the north of the study area (Baker, 1979). 

The Catahoula Sandstone is the deepest freshwater source 

in Montgomery County (Popkin, 1971) (fig. 2). Detailed 

information on the hydrogeology of the area can be found in 

Popkin (1971), Baker (1979), Chowdhury and Turco (2006), 

Kasmarek and others (2010).

In the natural groundwater-flow system, water recharges 

the aquifers in the unconfined outcrop areas, moves downward 

and coastward through the interbedded sands, and discharges 

upward as diffuse upward leakage in the confined downdip 

areas (Kasmarek and others, 2010). Much of the water that 

infiltrates into the saturated zone flows through locally continuous shallow sand layers and discharges into streams; the 

remainder of the water flows to intermediate and deep zones 

of the aquifer system southeastward of the outcrop, where it 

is captured and withdrawn by wells or naturally discharged by 

upward leakage in topographic lows along the coast. On the 

basis of historical groundwater-level-change maps, major areas 

of withdrawal include the municipalities of Magnolia, Conroe, 

and The Woodlands Township. Compared to predevelopment conditions (prior to the 1890s; Kasmarek and Robinson, 

2004), when the normal flow direction was from the northwest 

to southeast, the current areas experiencing groundwater-level 

declines have induced flow from the Chicot aquifer into the 

Evangeline aquifer. As development increased, the withdrawal 

of groundwater from wells increased to meet water demand, 

and the number of water wells increased. Withdrawal of water 

from a well creates a cone of depression in the saturated 

aquifer sediments, thereby increasing the gradient and radial 

flow of water towards the well. In this study area, the cumulative effect of groundwater withdrawn from all wells in Harris 

County and surrounding counties has resulted in water-level 

declines as individual cones of depression coalesced. This 

has resulted in areally extensive cones of depression with 

water levels as much as 200, 300, and 200 ft below National 

Geodetic Vertical Datum of 1929 or NAVD 88 in the Chicot, 

Evangeline, and Jasper aquifers, respectively (Kasmarek and 

others, 2010).

Methods

All of the samples were collected in 2008 from wells 

screened in the Gulf Coast aquifer system. Wells selected for 

sampling had to meet specific criteria, including the following: 

depth of well within targeted aquifer (Chicot, Evangeline, or 

Jasper, depending on well), short length of screened interval 

(less than 30 ft), and well cannot be completed in multiple 

aquifer units. After evaluating all wells that met these criteria, 

wells were selected to represent an areal distribution throughout Montgomery County (and adjacent small parts of Waller 

and Walker Counties). To the extent possible, wells with 

relatively short open intervals (less than 30 ft) were preferred 

for selection. Well depths ranged from 52 to 1,240 ft, with a 

median depth of 192 ft. Length of screened intervals for the 

wells ranged from 10 to 118 ft (appendix 1).

Sample Collection

Groundwater samples were collected using procedures described in the USGS “National Field Manual for 

the Collection of Water-Quality Data” (U.S. Geological 

Survey, variously dated) and provided by the USGS 

Chlorofluorocarbon Laboratory, Reston, Va. (U.S. Geological 

Survey, 2009). Groundwater-quality samples, physicochemical 

properties, and water-level data (when access allowed) were 

collected once from each site (fig. 1) during March–September 

2008 (appendixes 2–7). Groundwater samples were analyzed 

for dissolved gases and the environmental tracers sulfur 

hexafluoride (SF6

), chlorofluorocarbons (CFCs), tritium (3H), 

helium-4 (4He), and helium-3/tritium (3He/3H). Water levels in 
4 Groundwater Environmental Tracer Data Collected from the Chicot, Evangeline, and Jasper Aquifers

Figure 2. Hydrogeologic section of the Gulf Coast aquifer system in Montgomery and Harris Counties, Texas (modified from Popkin, 

1971, fig. 29). 

MONTGOMERY

COUNTY

o

o

o

o

o

o

o

o

o

o

1

2

3

4

5

6

7

8

9

10

A

A'

HARRIS

COUNTY

LOCATION MAP

Lower 

Upper part of 

Jasper

aquifer

Catahoula

Sandstone

Jackson

Group

Burkeville

confining 

unit

Chicot aquifer

Approximate

land

surface

MONTGOMERY COUNTY

HARRIS COUNTY

Spring Creek

Little Lake Creek

Lake Creek

Little Lake Creek

Undifferentiated Pre-Miocene deposits

Evangeline aquifer

Jasper

part of

aquifer

0 2 4 6 8 10 MILES

VERTICAL SCALE GREATLY EXAGGERATED

0 2 4 6 8 10 KILOMETERS

A A' Well number on location map

1 2 3 4 5 6 7 8 9 10

(Miocene-age sediments)

(Miocene-age sediments)

(Pliocene- and Miocene- age sediments)

(Holocene- and Pleistocene-age sediments)

(Miocene- age sediments)

(Miocene-age sediments)

TS–60–26–801

TS–60–35–203

TS–60–36–403

TS–60–44–101

TS–60–44–507

TS–60–44–902

TS–60–53–105

TS–60–53–810

TS–60–53–803

LJ–60–61–602 SOUTHEAST 

+ 400

NGVD 29

 - 400

 - 800

 - 1,200

 - 1,600

 - 2,000

 - 2,400

 - 2,800

 - 3,200

 - 3,600

 - 4,000

 - 4,400

FEET

+ 400

NGVD 29

 - 400

 - 800

 - 1,200

 - 1,600

 - 2,000

 - 2,400

 - 2,800

 - 3,200

 - 3,600

 - 4,000

 - 4,400

NORTHWEST

FEET

NGVD 29, NATIONAL GEODETIC VERTICAL DATUM OF 1929
Methods 5

wells were measured manually at the time of sampling, when 

possible, by using an electric tape or steel tape. In some wells 

with pumps, when water levels were not obtained because 

of either a lack of access point or an obstruction in the well, 

the most recent water-level measurement stored in the USGS 

Groundwater Site Inventory (GWSI) database is listed in 

appendix 1.

Observation wells were pumped using an electric, portable, submersible, positive displacement pump (Grundfos 

Redi-flo2, Redi-flo-3 or Fultz SP400R) constructed of stainless steel and Teflon. When practical, the intake on the portable submersible pump was set at a position about 10 times 

the diameter of the well above the top of the first screen in the 

well. Additionally, a stainless steel splitter was installed on top 

of the pump, above the check valve, allowing water to simultaneously discharge for physicochemical properties monitoring and waste through Teflon or polyethylene tubing and to 

discharge for sample collection through a refrigeration-grade 

copper line. Water was pumped from domestic and municipal 

wells using existing pumps, and samples were collected at the 

wellhead prior to installation of any pressure tanks or filtering 

or other treatment devices. Prior to any treatment, a connection was made for purging and sampling by using a brass connector with compression fitting to refrigeration-grade copper 

tubing. 

Prior to sample collection, one to three casing volumes 

were purged from the well, depending on well type, either 

observation or supply. For wells that are continuously pumped 

(or pumped regularly every few hours) such as those used for 

public supply, domestic supply, or industrial purposes, purging 

less than three casing volumes is permissible (U.S. Geological 

Survey, variously dated, chapter A4). The purge procedure 

removes stagnant water in the well, reduces chemical artifacts 

of well installation or well construction materials, or mitigates 

effects of infrequent pumping. After purging was complete, 

the physicochemical properties dissolved oxygen, pH, specific 

conductance, and water temperature were measured until 

readings were stable (U.S. Geological Survey, variously dated, 

appendix 2). Once readings stabilized, water samples were 

collected in new, pre-cleaned bottles. Water samples were 

Table 1. Geologic and hydrostratigraphic units of the Gulf Coast aquifer system in Montgomery County and adjacent counties, Texas.

Wood and Gabrysch, 

1965 Popkin, 1971

Holocene Alluvium

Beaumont Clay

Montgomery Formation

Bentley Formation

Eocene Jackson Group

Alluvium

Beaumont Clay

Montgomery Formation

Bentley Formation

Catahoula Sandstone

"Frio" 

Formation

Catahoula Sandstone

Anahuac 

Formation

Oakville 

Sandstone Jasper aquifer

Vicksburg Group

Jackson Group

Quaternary

Pleistocene

Oligocene

Tertiary 

Willis Sand (?)

Heavily pumped layer

Zone 2

Fleming Formation

Zone 1

Geologic unit

System Series Hydrostratigraphic unit

Evangeline aquifer

Fleming Formation

Ryder, 1988

Willis Sand

Goliad Sand

Chicot aquifer

Miocene

Pliocene Goliad Sand

Beaumont Clay and Alta 

Loma Sand

Burkeville confining unit

Catahoula Sandstone
6 Groundwater Environmental Tracer Data Collected from the Chicot, Evangeline, and Jasper Aquifers

collected and processed onsite using methods designed to 

minimize changes to the water-sample chemistry or contamination from the atmosphere. To prevent degradation of water 

samples and maintain the initial concentration of compounds 

between the time of sample collection and laboratory analyses, 

bottle lids were taped on, copper tubes were crimped shut, and 

samples were stored according to the laboratory protocols, 

which might include storing upside down, or storing either 

chilled or at room temperature.

All equipment used for the collection of the environmental tracers was cleaned with tap water and a native water 

rinse. The external parts of the submersible pump were rinsed 

with tap water and the interior of sample and discharge lines 

was rinsed with multiple volumes of native water prior to 

collection. The introduction of solvents, such as methanol, or 

detergents may impact the quality of the samples.

Analytical Methods

SF6 and CFCs analyses were done at the USGS 

Chlorofluorocarbon Laboratory by using a purge-and-trap gas 

chromatography procedure with an electron capture detector 

(ECD) documented by Busenberg and Plummer (1992, 2000). 

3

He/3H analyses were done at the Noble Gas Laboratory of 

Lamont-Doherty Earth Observatory (LDEO) of Columbia 

University, Palisades, N.Y., using 3He-ingrowth with mass 

spectrometry for 3H (Clarke and others, 1976) and mass spectrometry for 3

He as described in Schlosser and others (1988) 

and Ekwurzel and others (1994). 3H analyses were done at the 

USGS Tritium Laboratory, Menlo Park, Calif., using electrolytic enrichment (Östlund and Werner, 1962) and liquid 

scintillation (Thatcher and others, 1977). Sample analysis for 

4

He and dissolved gases was done at the USGS Dissolved Gas 

Laboratory, Reston, using gas chromatography as described 

in Busenberg and others (1993) and Busenberg, and others 

(2001). 

Quality Control

No blank samples were collected as part of this study 

due to the difficulty in preparation of tracer- and dissolvedgas-free water. For quality assurance, all samples were collected and analyzed as replicate samples, in accordance with 

standard procedure for collecting the environmental tracers 

specific to this report. A summary of replicate analyses and 

relative percent differences is not included in this report. 

Although samples were collected as replicate samples, all 

values were analyzed, reviewed and included in the determination of apparent groundwater ages. Summary statistics 

for environmental tracers are not provided. The evaluation of 

an individual analyte in relation to its replicate, for example 

CFCs, is also dependent upon the SF6

 and/or 3He/3H result 

provided. Even if a result for CFCs appears valid, it may be 

contradicted by evidence in one of the other environmental 

tracers.

Groundwater Environmental Tracer 

Data 

Well-construction data for groundwater wells from which 

samples were collected and analyzed for dissolved gases 

and environmental tracer data in the Chicot, Evangeline, and 

Jasper aquifers in Montgomery County and adjacent counties 

are presented in appendix 1. Physicochemical data collected 

to help ensure that groundwater samples characterized water 

from the Chicot, Evangeline, and Jasper aquifers are presented 

in appendix 2. Dissolved-gas and environmental tracer data 

analyzed in groundwater samples collected from the Chicot, 

Evangeline and Jasper aquifers during March–September 

2008 are presented in appendixes 3–7. Appendix 3 contains 

dissolved-gas data analyzed by the USGS Dissolved Gas 

Laboratory. Appendix 4 contains SF6 and CFC data analyzed 

by the USGS Chlorofluorocarbon Laboratory. Appendix 5 

contains 3H data analyzed by the USGS Tritium Laboratory. 

Appendix 6 contains 4He data analyzed by the USGS 

Dissolved Gas Laboratory. Appendix 7 contains helium, tritium, and neon data analyzed by the Noble Gas Laboratory of 

LDEO of Columbia University.

Summary

The Gulf Coast aquifer system is the primary water supply for Montgomery County in southeastern Texas, including part of the Houston, Texas, metropolitan area and the 

municipalities of Magnolia, Conroe, and The Woodlands 

Township, Texas. Montgomery County is forecasted to be 

one of the fastest growing counties in the Houston area, more 

than doubling its 2000 population of 373,000 by 2035. The 

U.S. Geological Survey (USGS), in cooperation with the Lone 

Star Groundwater Conservation District, conducted a study 

to appraise groundwater recharge in the Gulf Coast aquifer 

within Montgomery County and adjacent counties by using 

environmental tracers. The Gulf Coast aquifer system in 

Montgomery County consists of the Chicot, Evangeline, and 

Jasper aquifers, the Burkeville confining unit, and the underlying Catahoula Sandstone. 

Of the 40 existing groundwater wells screened in the 

Gulf Coast aquifer system that were selected for sampling, 38 

were in Montgomery County, 1 was in Waller County, and 1 

was in Walker County. Groundwater-quality samples, physicochemical properties, and water-level data were collected once 

from each of the 40 wells during March–September 2008. 

Groundwater-quality samples were analyzed for dissolved 

gases and the environmental tracers sulfur hexafluoride (SF6

), 

chlorofluorocarbons (CFCs), tritium (3H), helium-4 (4He), and 

helium-3/tritium (3He/3H). Water samples were collected from 

wells using procedures described in the USGS “National Field 

Manual for the Collection of Water-Quality Data” and provided by the USGS Chlorofluorocarbon Laboratory. Samples 
References Cited 7

were collected and processed onsite using methods designed 

to minimize changes to the water-sample chemistry or contamination from the atmosphere. Samples were analyzed for 

SF6 and CFCs at the USGS Chlorofluorocarbon Laboratory, 

for 3H at the USGS Tritium Laboratory, for 3He/3H at the 

Noble Gas Laboratory of Lamont-Doherty Earth Observatory 

of Columbia University, and for 4He and dissolved gases at the 

USGS Dissolved Gas Laboratory. Sample procedures required 

replicate samples for quality assurance and quality control 

to be collected with each environmental sample; no blank 

samples were collected. 

References Cited

Baker, E.T., Jr., 1979, Stratigraphic and hydrogeologic 

framework of part of the Coastal Plain of Texas: Texas 

Department of Water Resources Report 236, 43 p.

Busenberg, Eurybiades, and Plummer L.N., 1992, Use of chlorofluorocarbons (CCl3

F and CCl2F2) as hydrologic tracers 

and age-dating tools—The alluvium and terrace system of 

Central Oklahoma: Water Resources Research, v. 28, no. 9, 

p. 2,257–2,283.

Busenberg, Eurybiades, and Plummer, L.N., 2000, Dating 

young ground water with sulfur hexafluoride—Natural 

and anthropogenic sources of sulfur hexafluoride: Water 

Resources Research, v. 36, no. 10, p. 3,011–3,030.

Busenberg, Eurybiades, Plummer, L.N., and Bartholomay, 

R.C., 2001, Estimated age and source of the young fraction of ground water at the Idaho National Engineering and 

Environmental Laboratory: U.S. Geological Survey WaterResources Investigations Report 01–4265, 144 p.

Busenberg, Eurybiades, Weeks, E.P., Plummer, L.N., and 

Bartholomay, R.C., 1993, Age dating groundwater by 

use of chlorofluorocarbons (CCl3

F and CCl2F2) and distribution of chlorofluorocarbons in the unsaturated zone, 

Snake River Plain aquifer, Idaho National Engineering 

Laboratory, Idaho: U.S. Geological Survey Water-Resources 

Investigations Report 93–4054, 47 p.

Chowdhury, A.H., and Turco, M.J., 2006, Geology of the 

Gulf Coast aquifer, Texas, in Mace, R.E., Davidson, S.C., 

Angle, E.S., and Mullican, W.F., III, eds., Aquifers of the 

Gulf Coast of Texas: Texas Water Development Board 

Report 365, chap. 2, p. 23–50, accessed February 10, 

2011, at http://www.twdb.state.tx.us/publications/reports/

GroundWaterReports/GWReports/R365/ch02-Geology.pdf.

Clarke, W.B., Jenkins, W.J., and Top, Z., 1976, Determination 

of tritium by mass spectrometric measurements of 3

He: 

Internation Journal of Applied Radiation and Isotopes, 

v. 27, no. 9, p. 515–522.

Ekwurzel, Brenda, Schlosser, Peter, Smethie, W.M., Jr., 

Plummer, L.N., Busenberg, Eurybiades, Michel, R.L., 

Weppernig, Ralf, and Stute, Martin, 1994, Dating of shallow 

groundwater—Comparison of the transient tracers 3H/3He, 

chlorofluorocarbons, and 85Kr: Water Resources Research, 

v. 30, no. 6, p. 1,693–1,708.

Houston Galveston Area Council, 2006, Houston-Galveston 

Area Council 2035 regional growth forecast: Houston, Tex., 

20 p.

Kasmarek, M.C., Johnson, M.R., and Ramage, J.R., 2010, 

Water-level altitudes 2010 and water-level changes in the 

Chicot, Evangeline, and Jasper aquifers and compaction 

1973–2009 in the Chicot and Evangeline aquifers, HoustonGalveston region, Texas: U.S. Geological Survey Scientific 

Investigations Map 3138, 17 p., 16 sheets, 1 appendix.

Kasmarek, M.C., and Robinson, J.L., 2004, Hydrogeology and 

simulation of ground-water flow and land-surface subsidence in the northern part of the Gulf Coast aquifer system, 

Texas: U.S. Geological Survey Scientific Investigations 

Report 2004–5102, 111 p.

National Climatic Data Center, 2010, Climate at a glance, 

Houston—Annual total precipitation, 1941–present: 

U.S. Department of Commerce, National Oceanic and 

Atmospheric Administration, accessed July 19, 2010, 

at http://www.ncdc.noaa.gov/oa/climate/research/cag3/

v1.html.

Noble, J.E., Bush, P.W., Kasmarek, M.C., and Barbie, D.L, 

1996, Estimated depth to water table and estimated rate of 

recharge in outcrops of the Chicot and Evangeline aquifers near Houston, Texas: U.S. Geological Survey WaterResources Investigation Report 96–4018, 19 p.

Nolan, B.T., Healy, R.W., Taber, P.E., Perkins, Kimberlie, Hitt, 

K.J., and Wolock, D.M., 2007, Factors influencing groundwater recharge in the eastern United States: Journal of 

Hydrology v. 332, no. 1–2, p. 187–205.

Östlund, H.G., and Werner, E., 1962, Electrolytic enrichment of tritium and deuterium for natural tritium measurements—Tritium in the physical and biological sciences: 

Vienna, Austria, International Atomic Energy Agency, v. 1, 

p. 96–104.

Popkin, B.P., 1971, Groundwater resources of Montgomery 

County, Texas: Texas Water Development Board Report 

136, 143 p.

Ryder, P.D., 1988, Hydrogeology and predevelopment flow 

in the Texas Gulf Coast aquifer systems: U.S. Geological 

Survey Water-Resources Investigations Report 87–4248, 

109 p.

Schlosser, P., Stute, M., Dörr, H., Sonntag, C., and Münnich, 

K.O., 1988, Tritium/3

He dating of shallow ground water: 

Earth and Planetary Science Letters, v. 89, p. 353–362.
8 Groundwater Environmental Tracer Data Collected from the Chicot, Evangeline, and Jasper Aquifers

Texas State Data Center, 2010, Estimates of the total populations of counties and places in Texas for July 1, 2009 

and January 1, 2010: Office of the State Demographer, 

Population Estimates and Projections Program, accessed 

February 14, 2011, at http://txsdc.utsa.edu/download/pdf/

estimates/2009_txpopest_msa.pdf.

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use information—Groundwater pumpage estimates: 

accessed March 14, 2011, at http://www.twdb.state.tx.us/

wushistorical/DesktopDefault.aspx?PageID=2.

Thatcher, L.L., Janzer, V.J., and Edwards, K.W., 1977, 

Methods for determination of radioactive substances in 

water and fluvial sediments: U.S. Geological Survey 

Techniques of Water-Resources Investigations, book 5, 

chap. A5, 95 p.

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Montgomery County, Texas: U.S. Department of 

Agriculture, Soil Conservation Service and Forest 

Service, 102 p., available at http://soils.usda.gov/survey/

online_surveys/texas/.

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Survey Techniques of Water-Resources Investigations, 

book 9, chaps. A1–A9, accessed May 27, 2010, at 

http://pubs.water.usgs.gov/twri9A.

U.S. Geological Survey, 2009, The Reston Chlorofluorocarbon 

Laboratory: accessed May 27, 2010, at http://water.usgs.

gov/lab/.

Wood, L.A., and Gabrysch, R.K., 1965, Analog model study 

of ground water in the Houston district, Texas: Texas Water 

Commission, Bulletin 6508, 103 p.
Appendixes 1–7
10 Groundwater Environmental Tracer Data Collected from the Chicot, Evangeline, and Jasper Aquifers

Appendix 1. Well-construction information for groundwater wells sampled in the Chicot, Evangeline, and Jasper aquifers in 

Montgomery County and adjacent counties, Texas, 2008.

[Station name refers to State well number (TS, Montgomery County; YU, Walker County; YW, Waller County); 4-digit identifiers are Groundwater Site 

Inventory components; NAVD 88, North American Vertical Datum of 1988; ft, feet; LSD, land-surface datum; in., inches; S, steel; P, polyvinyl chloride; 

U, unknown; --, data not available; SS, stainless steel; GI, galvanized iron; GS, galvanized steel]

Station

name

Station

number

Altitude 

of land 

surface, 

NAVD 88

(ft)

Primary use 

of site

Primary 

use of 

water

Aquifer

name

Well 

depth

(ft)

Water-level 

measurement date

Water 

level 

below 

LSD

(ft)

Date of 

construction

(C012) (C001) (C016) (C023) (C024) (C028) (C235) (C237) (C060)

TS–60–53–719 300824095274703 138 Observation Unused Chicot 120 3/12/2008 21.61 2/14/1991

TS–60–53–720 300824095274702 138 Observation Unused Chicot 85 3/13/2008 22.51 2/20/1991

TS–60–44–805 301505095343702 171 Observation Unused Chicot 161 3/17/2008 39 3/20/1991

TS–60–45–413 301948095290003 240 Observation Unused Chicot 109.5 3/19/2008 53.56 10/19/1989

TS–60–45–414 301948095290004 240 Observation Unused Chicot 80 3/19/2008 53.56 10/20/1989

TS–60–54–805 300833095173201 116 Observation Unused Chicot 165 3/21/2008 46.84 7/12/1991

TS–60–54–806 300833095173202 116 Observation Unused Chicot 128 3/24/2008 46.74 7/15/1991

TS–60–35–504 302636095422802 243 Observation Unused Evangeline 83 3/25/2008 13.60 3/5/1991

TS–60–35–505 302636095422803 243 Observation Unused Evangeline 60 3/25/2008 13.85 3/8/1991

TS–60–54–807 300833095173203 116 Observation Unused Chicot 66 3/26/2008 32.29 7/22/1991

TS–60–35–503 302636095422801 240 Observation Unused Evangeline 118 3/26/2008 13.50 3/1/1991

TS–60–44–806 301505095343703 171 Observation Unused Chicot 75 3/27/2008 37.73 3/22/1991

Appendix 1
Appendix 1 11

Appendix 1. Well-construction information for groundwater wells sampled in the Chicot, Evangeline, and Jasper aquifers in 

Montgomery County and adjacent counties, Texas, 2008—Continued.

Station

name

Depth to 

top of casing string

(ft)

Depth to 

bottom 

of casing 

string

(ft)

Diameter 

of casing 

string

(in.)

Casing

material

Depth to 

top of open 

interval

(ft)

Depth to 

bottom 

of open 

interval

(ft)

Diameter 

of open 

interval

(in.)

Type of 

material 

in open 

interval

Type of 

open 

interval

(C012) (C077) (C078) (C079) (C080) (C083) (C084) (C087) (C086) (C085)

TS–60–53–719 0 88 6 S 100 120 4 S Screen

80 100 4 S

TS–60–53–720 0 58 6 S 65 85 4 S Screen

50 65 4 S

TS–60–44–805 0 138 6 P 141 161 4 P Screen

135 141 4 P

TS–60–45–413 0 99.5 4 P 99.5 109.5 4 P Screen

TS–60–45–414 0 70 4 P 70 80 4 P Screen

TS–60–54–805 0 139 6 S 146 165 4 S Screen

129 145 4 S

TS–60–54–806 0 106 6 S 108 128 4 S Screen

98 108 4 S

TS–60–35–504 0 59 6 P 63 83 4 P Screen

49 63 4 P

TS–60–35–505 0 39 6 P 40 60 4 P Screen

30 40 4 P

TS–60–54–807 0 56 6 S 56 66 6 S Screen

TS–60–35–503 0 97 6 P 98 118 4 P Screen

90 98 4 P

TS–60–44–806 0 53 6 P 55 75 4 P Screen

48 55 4 P
12 Groundwater Environmental Tracer Data Collected from the Chicot, Evangeline, and Jasper Aquifers

Appendix 1. Well-construction information for groundwater wells sampled in the Chicot, Evangeline, and Jasper aquifers in 

Montgomery County and adjacent counties, Texas, 2008—Continued.

Station

name

Station

number

Altitude 

of land 

surface, 

NAVD 88

(ft)

Primary use 

of site

Primary use 

of water

Aquifer

name

Well 

depth

(ft)

Waterlevel 

measurement date

Water 

level 

below 

LSD

(ft)

Date of 

construction

(C012) (C001) (C016) (C023) (C024) (C028) (C235) (C237) (C060)

TS–60–26–901 303222095455301 312 Withdrawal Domestic Jasper 324 1/31/2008 115.19 10/26/2005

TS–60–26–208 303610095484501 410 Unused Unused Jasper 172 1/31/2008 146.72 8/1992

TS–60–45–513 301912095253701 195 Withdrawal Industrial Chicot 168 1/29/1977 38 1/29/1977

TS–60–34–301 302836095452701 380 Withdrawal Domestic Evangeline 52 3/17/1983 35 3/17/1983

YW–59–64–206 300542096045403 235 Withdrawal Public supply Jasper 1,240 1/23/2008 93.85 1967

TS–60–43–511 301904095414801 308 Withdrawal Public supply Evangeline 389 2/4/2008 223.54 9/1978

TS–60–63–110 300642095131701 90 Withdrawal Domestic Chicot 97 -- -- 1988

TS–60–37–309 302850095241801 390 Observation Unused Evangeline 61 -- -- 4/4/1978

TS–60–54–702 300958095221901 95 Withdrawal Industrial Chicot 95 -- -- 1983

TS–60–44–212 302014095343201 203 Withdrawal Public supply Evangeline 477 4/8/1989 70 4/8/1989

TS–60–55–710 300849095143301 112 Observation Unused Evangeline 600 7/16/2008 130.52 8/13/1991

YU–60–28–802 303143095334801 315 Observation Unused Jasper 181 7/17/2008 76.21 10/27/1989

TS–60–45–114 302040095281701 263 Withdrawal Irrigation Chicot 128 8/6/1984 51 8/6/1984
Appendix 1 13

Appendix 1. Well-construction information for groundwater wells sampled in the Chicot, Evangeline, and Jasper aquifers in 

Montgomery County and adjacent counties, Texas, 2008—Continued.

Station

name

Depth to 

top of casing string

(ft)

Depth to 

bottom 

of casing 

string

(ft)

Diameter 

of casing 

string

(in.)

Casing

material

Depth 

to top 

of open 

interval

(ft)

Depth to 

bottom 

of open 

interval

(ft)

Diameter 

of open 

interval

(in.)

Type of 

material 

in open 

interval

Type of open 

interval

(C012) (C077) (C078) (C079) (C080) (C083) (C084) (C087) (C086) (C085)

TS–60–26–901 0 290 4 S 295 324 2.5 S Screen

285 295 2.5 S

TS–60–26–208 0 157 4 U 157 172 3 U Screen

TS–60–45–513 0 150 4 P 158 168 2.5 SS Screen

146 168 2.5 P

TS–60–34–301 0 37 2 37 47 2 P Screen

47 52 2 P

YW–59–64–206 0 10.75 U 1,111 1,229 -- U Screen

TS–60–43–511 0 347 7 S 347 389 4.5 SS Wire-wound screen

305 347 4.5 S

TS–60–63–110 0 95 85 95 -- U Screen

TS–60–37–309 0 51 4 P 51 61 -- U Screen

TS–60–54–702 0 90 4 P 80 90 4 P Screen

TS–60–44–212 0 436 5 P 457 477 2.5 U Screen

426 457 2.5 P

TS–60–55–710 -- -- -- U 570 600 4 S Screen

YU–60–28–802 0 171 4 P 171 181 4 P Screen

TS–60–45–114 0 118 4 P 118 128 2.5 S Wire-wound screen

107 128 2.5 GI
14 Groundwater Environmental Tracer Data Collected from the Chicot, Evangeline, and Jasper Aquifers

Appendix 1. Well-construction information for groundwater wells sampled in the Chicot, Evangeline, and Jasper aquifers in 

Montgomery County and adjacent counties, Texas, 2008—Continued.

Station

name

Station

number

Altitude 

of land 

surface, 

NAVD 88

(ft)

Primary use 

of site

Primary use 

of water

Aquifer

name

Well 

depth

(ft)

Waterlevel 

measurement date

Water 

level 

below 

LSD

(ft)

Date of 

construction

(C012) (C001) (C016) (C023) (C024) (C028) (C235) (C237) (C060)

TS–60–53–210 301338095272301 125 Withdrawal Industrial Evangeline 222 2/24/1984 27 2/24/1984

TS–60–43–514 301917095413101 312 Withdrawal Public supply Jasper 1,050 2/4/2008 296.93 2003

TS–60–45–716 301614095284201 132 Withdrawal Recreations Evangeline 710 2/5/2008 260.30 5/30/1997

TS–60–42–902 301612095450901 281 Withdrawal Domestic Evangeline 212 7/23/1990 85 7/22/1990

TS–60–53–516 301228095272501 129 Observation Unused Evangeline 807 8/18/2008 370.48 5/21/1991

TS–60–36–410 302651095362901 205 Withdrawal Public supply Jasper 467 2/8/2008 130.39 3/27/1995

TS–60–35–907 302412095382101 238 Withdrawal Public supply Jasper 490 2/1/2008 175.48 5/14/1982

TS–60–37–806 302436095263501 280 Withdrawal Public supply Evangeline 350 1/31/2008 177.98 11/19/1984
Appendix 1 15

Appendix 1. Well-construction information for groundwater wells sampled in the Chicot, Evangeline, and Jasper aquifers in 

Montgomery County and adjacent counties, Texas, 2008—Continued.

Station

name

Depth to top 

of casing 

string

(ft)

Depth to 

bottom 

of casing 

string

(ft)

Diameter of 

casing string

(in.)

Casing

material

Depth to 

top of open 

interval

(ft)

Depth to 

bottom 

of open 

interval

(ft)

Diameter 

of open 

interval

(in.)

Type of 

material 

in open 

interval

Type of 

open interval

(C012) (C077) (C078) (C079) (C080) (C083) (C084) (C087) (C086) (C085)

TS–60–53–210 0 210 4 P 212 222 2 S Screen

201 222 2 GI

TS–60–43–514 0 840 14 S 844 864 8.62 U Screen

744 844 8.62 S 874 886 8.62 U Screen

864 874 8.62 S 890 902 8.62 U Screen

886 890 8.62 S 930 940 8.62 U Screen

902 930 8.62 S 968 1,028 8.62 U Screen

940 968 8.62 S

1,028 1,050 8.62 S

TS–60–45–716 0 20 14 S 647 710 5 SS Screen

0 632 9 S

605 647 5 S

TS–60–42–902 0 182 4 P 192 212 2.5 P Perforated or slotted

177 212 2.5 P

TS–60–53–516 0 774 6 S 777 807 4 S Screen

747 777 4 S

TS–60–36–410 0 -- 5 U 444 465 -- U Screen

TS–60–35–907 0 470 6 S 470 490 4 SS Wire-wound screen

449 470 4 GI 480 490 4 SS Wire-wound screen

TS–60–37–806 0 330 4 S 330 350 3 SS Wire-wound screen

316 330 3 S
16 Groundwater Environmental Tracer Data Collected from the Chicot, Evangeline, and Jasper Aquifers

Appendix 1. Well-construction information for groundwater wells sampled in the Chicot, Evangeline, and Jasper aquifers in 

Montgomery County and adjacent counties, Texas, 2008—Continued.

Station

name

Station

number

Altitude 

of land 

surface, 

NAVD 88

(ft)

Primary use 

of site

Primary use 

of water

Aquifer

name

Well 

depth

(ft)

Waterlevel measurement 

date

Water 

level 

below 

LSD

(ft)

Date of 

construction

(C012) (C001) (C016) (C023) (C024) (C028) (C235) (C237) (C060)

TS–60–37–909 302452095242001 280 Withdrawal Public supply Evangeline 515 1/31/2008 164.90 3/1985

TS–60–59–102 300658095443101 231 Withdrawal Public supply Evangeline 298 2/2/2007 108.03 12/21/2001

TS–60–51–809 300853095412701 195 Withdrawal Public supply Chicot 203 7/29/1994 59 7/27/1994

TS–60–51–8XXB 300849095412601 204 Withdrawal Public supply Chicot 203 -- -- --

TS–60–51–8XXA 300849095415701 212 Withdrawal Public supply Chicot 252 -- -- --

TS–60–52–1xx 301332095361901 216 Withdrawal Public supply Evangeline 440 -- -- --

TS–60–51–5xx 301057095421901 246 Withdrawal Public supply Evangeline 416 -- -- --
Appendix 1 17

Appendix 1. Well-construction information for groundwater wells sampled in the Chicot, Evangeline, and Jasper aquifers in 

Montgomery County and adjacent counties, Texas, 2008—Continued.

Station

name

Depth to 

top of casing string

(ft)

Depth to 

bottom 

of casing 

string

(ft)

Diameter 

of casing 

string

(in.)

Casing

material

Depth 

to top 

of open 

interval

(ft)

Depth to 

bottom 

of open 

interval

(ft)

Diameter of 

open 

interval

(in.)

Type of 

material in 

open 

interval

Type of open 

interval

(C012) (C077) (C078) (C079) (C080) (C083) (C084) (C087) (C086) (C085)

TS–60–37–909 0 470 4 U 500 515 3 U Screen

466 515 3 U

TS–60–59–102 0 275 6.88 GS 275 296 4.5 U Screen

296 298 4.5

TS–60–51–809 0 190 5 P 190 203 3 P Perforated or slotted

183 203 3 P

TS–60–51–8XXB -- -- -- U 183 -- -- U U

TS–60–51–8XXA -- -- -- U 232 -- -- U U

TS–60–52–1xx -- -- -- U 340 -- -- U U

TS–60–51–5xx -- -- -- U 384 -- -- U U
18 Groundwater Environmental Tracer Data Collected from the Chicot, Evangeline, and Jasper Aquifers

Appendix 2. Physicochemical data measured in groundwater samples collected from the Chicot, Evangeline, and Jasper aquifers in 

Montgomery County and adjacent counties, Texas, 2008.

[Station name refers to State well number (TS, Montgomery County; YU, Walker County; YW, Waller County); 5-digit numbers are National Water Information 

System parameter codes; mg/L, milligrams per liter; std, standard; μS/cm, microsiemens per centimeter at 25 degrees Celsius; °C, degrees Celsius; U, analyzed 

for, not detected; --, no sample; M, presence verified, not quantified; N, presumptive evidence of presence]

Station

name

Station

number

Sample

date

Sample

time

Dissolved 

oxygen

(mg/L) 

(00300)

pH,

std units

(00400)

Specific conductance

(μS/cm)

(00095)

Water 

temperature

(°C)

(00010)

Hydrogen 

sulfide,

presence/

absence,

water 

unfiltered

(mg/L)

(71875)

TS–60–53–719 300824095274703 3/12/2008 1415 3.9 5.7 627 23.3 U

TS–60–53–720 300824095274702 3/13/2008 1410 .7 8.2 602 29.1 U

TS–60–44–805 301505095343702 3/17/2008 1300 5.4 5.6 114 22.1 U

TS–60–45–413 301948095290003 3/19/2008 845 5.6 7.1 305 22.5 U

TS–60–45–414 301948095290004 3/19/2008 1215 5.6 6.7 270 24.6 --

TS–60–54–805 300833095173201 3/21/2008 1315 3.0 6.2 420 21.7 --

TS–60–54–806 300833095173202 3/24/2008 1200 2.1 6.1 466 21.5 --

TS–60–35–504 302636095422802 3/25/2008 1100 3.8 6.8 527 21.1 --

TS–60–35–505 302636095422803 3/25/2008 1330 3.6 6.0 173 20.6 --

TS–60–54–807 300833095173203 3/26/2008 900 3.6 6.8 529 21.5 --

TS–60–35–503 302636095422801 3/26/2008 1400 4.4 7.0 638 21.3 --

TS–60–44–806 301505095343703 3/27/2008 1230 3.2 5.8 648 23.0 --

TS–60–26–901 303222095455301 4/21/2008 1030 1.2 7.0 575 22.1 --

TS–60–26–208 303610095484501 4/21/2008 1400 .5 7.1 451 22.9 --

TS–60–45–513 301912095253701 4/22/2008 930 3.2 5.8 151 21.2 --

TS–60–34–301 302836095452701 4/22/2008 1330 1.6 7.0 600 22.5 --

YW–59–64–206 300542096045403 4/23/2008 1045 .4 7.6 1,270 30.9 M

TS–60–43–511 301904095414801 4/23/2008 1345 1.6 6.9 696 23.0 --

TS–60–63–110 300642095131701 4/24/2008 1530 .3 5.9 301 21.2 --

TS–60–37–309 302850095241801 4/28/2008 1200 .7 7.0 713 22.7 N

Appendix 2
Appendix 2 19

Appendix 2. Physicochemical data measured in groundwater samples collected from the Chicot, Evangeline, and Jasper aquifers in 

Montgomery County and adjacent counties, Texas, 2008—Continued.

Station

name

Station

number

Sample

date

Sample

time

Dissolved 

oxygen

(mg/L) 

(00300)

pH,

std units

(00400)

Specific 

conductance

(μS/cm)

(00095)

Water 

temperature

(°C)

(00010)

Hydrogen 

sulfide,

presence/

absence,

water 

unfiltered

(mg/L)

(71875)

TS–60–54–702 300958095221901 4/30/2008 1030 1.4 5.5 114 23.1 --

TS–60–44–212 302014095343201 7/10/2008 1224 1.5 7.3 613 23.8 U

TS–60–55–710 300849095143301 7/16/2008 1630 .7 7.7 367 24.2 U

YU–60–28–802 303143095334801 7/17/2008 1620 .6 8.2 411 28.9 U

TS–60–45–114 302040095281701 7/18/2008 1135 5.6 5.2 93 23.2 U

TS–60–53–210 301338095272301 7/21/2008 935 4.0 7.2 458 22.3 U

TS–60–43–514 301917095413101 7/21/2008 1245 .9 7.2 575 27.9 --

TS–60–45–716 301614095284201 8/1/2008 845 1.3 7.5 588 25.4 M

TS–60–42–902 301612095450901 8/1/2008 1400 6.3 7.0 265 21.8 U

TS–60–53–516 301228095272501 8/18/2008 1530 .2 8.8 529 25.6 U

TS–60–36–410 302651095362901 9/2/2008 950 .4 7.0 517 23.1 U

TS–60–35–907 302412095382101 9/2/2008 1215 .7 7.1 551 24.3 U

TS–60–37–806 302436095263501 9/3/2008 1245 .3 7.0 688 22.6 --

TS–60–37–909 302452095242001 9/3/2008 1520 .3 7.1 708 23.2 --

TS–60–59–102 300658095443101 9/4/2008 915 5.3 7.4 410 22.2 --

TS–60–51–809 300853095412701 9/4/2008 1040 6.1 6.2 386 22.3 U

TS–60–51–8XXB 300849095412601 9/4/2008 1140 2.4 6.5 461 21.8 --

TS–60–51–8XXA 300849095415701 9/4/2008 1415 5.7 6.6 393 22.4 --

TS–60–52–1xx 301332095361901 9/5/2008 900 .3 7.5 460 22.2 --

TS–60–51–5xx 301057095421901 9/5/2008 1035 .4 7.3 615 23.5 --
20 Groundwater Environmental Tracer Data Collected from the Chicot, Evangeline, and Jasper Aquifers

Appendix 3

Appendix 3. Dissolved-gas concentrations measured in groundwater samples collected from the Chicot, Evangeline, and Jasper 

aquifers in Montgomery County and adjacent counties, Texas, 2008 (samples analyzed by the U.S. Geological Survey Dissolved Gas 

Laboratory, Reston, Virginia).

[Station name refers to State well number (TS, Montgomery County; YU, Walker County; YW, Waller County); mg/L, milligrams per liter; °C, degrees Celsius; 

cc STP/L, cubic centimeters at standard temperature and pressure per liter; <, less than; >, greater than; --, not determined]

Station

name

Station

number

Sample

date

Sample

time

Nitrogen 

(N2

)

(mg/L)

Argon 

(Ar)

(mg/L)

Oxygen 

(O2)

(mg/L)

Carbon 

dioxide 

(CO2

)

(mg/L)

Methane 

(CH4

)

(mg/L)

Recharge 

temperature

(°C)

Excess air 

in water 

sample

(cc STP/L)

TS–60–53–719 300824095274703 3/12/2008 1415 18.56 0.64 2.86 132.12 <0.0005 16.3 2.8

TS–60–53–719 300824095274703 3/12/2008 1415 18.69 .64 3.00 131.55 <.0005 16.3 2.9

TS–60–53–720 300824095274702 3/13/2008 1410 14.87 .53 .20 0.40 .8389 23.5 1.0

TS–60–53–720 300824095274702 3/13/2008 1410 14.72 .53 .20 0.35 .9841 23.6 .9

TS–60–44–805 301505095343702 3/17/2008 1300 18.79 .66 5.06 94.30 <.0005 14.3 2.4

TS–60–44–805 301505095343702 3/17/2008 1300 18.93 .66 4.21 95.22 <.0005 14.2 2.5

TS–60–45–413 301948095290003 3/19/2008 845 18.83 .64 3.12 7.47 .0082 16.3 3.1

TS–60–45–413 301948095290003 3/19/2008 845 18.94 .65 2.70 9.57 .0072 16.1 3.2

TS–60–45–414 301948095290004 3/19/2008 1215 19.30 .64 4.69 58.95 <.0005 18.1 4.1a

TS–60–45–414 301948095290004 3/19/2008 1215 17.90 .61 4.37 69.15 <.0005 18.5 2.8

TS–60–54–805 300833095173201 3/21/2008 1315 20.58 .69 1.62 117.19 <.0005 14.0 4.1

TS–60–54–805 300833095173201 3/21/2008 1315 19.63 .68 1.56 116.94 <.0005 14.2 3.2

TS–60–54–806 300833095173202 3/24/2008 1200 20.07 .68 1.02 134.31 .0014 14.0 3.6

TS–60–54–806 300833095173202 3/24/2008 1200 19.56 .68 1.01 137.12 .0015 14.1 3.0

TS–60–35–504 302636095422802 3/25/2008 1100 18.11 .62 1.98 49.93 <.0005 17.7 2.8

TS–60–35–504 302636095422802 3/25/2008 1100 18.09 .62 1.96 49.88 <.0005 17.3 2.7

TS–60–35–505 302636095422803 3/25/2008 1330 19.59 .64 2.90 83.67 <.0005 18.7 4.6

TS–60–35–505 302636095422803 3/25/2008 1330 19.19 .63 2.87 81.76 <.0005 18.7 4.2

TS–60–35–503 302636095422801 3/26/2008 1400 16.96 .60 2.80 36.52 <.0005 18.5 1.9

TS–60–35–503 302636095422801 3/26/2008 1400 17.03 .60 2.61 36.65 <.0005 18.7 2.0

TS–60–54–807 300833095173203 3/26/2008 900 19.85 .66 .82 62.17 .0064 17.3 4.4

TS–60–54–807 300833095173203 3/26/2008 900 20.86 .69 .82 64.98 .0053 15.7 4.9

TS–60–44–806 301505095343703 3/27/2008 1230 20.58 .70 .89 119.88 <.0005 13.6 4.0

TS–60–44–806 301505095343703 3/27/2008 1230 20.17 .69 .60 116.06 <.0005 13.6 3.6

TS–60–26–208 303610095484501 4/21/2008 1400 19.19 .65 .25 21.10 <.0005 16.2 3.6

TS–60–26–208 303610095484501 4/21/2008 1400 18.98 .65 .25 20.80 <.0005 16.2 3.4

TS–60–26–901 303222095455301 4/21/2008 1030 18.30 .63 .23 32.68 .0049 17.2 2.9

TS–60–26–901 303222095455301 4/21/2008 1030 18.19 .63 .26 32.66 .0058 17.2 2.8

TS–60–45–513 301912095253701 4/22/2008 930 19.60 .68 3.22 94.40 <.0005 13.4 2.9

TS–60–45–513 301912095253701 4/22/2008 930 19.49 .68 3.20 95.05 <.0005 13.4 2.8
Appendix 3 21

Appendix 3. Dissolved-gas concentrations measured in groundwater samples collected from the Chicot, Evangeline, and Jasper 

aquifers in Montgomery County and adjacent counties, Texas, 2008 (samples analyzed by the U.S. Geological Survey Dissolved Gas 

Laboratory, Reston, Virginia)—Continued.

Station

name

Station

number

Sample

date

Sample

time

Nitrogen 

(N2

)

(mg/L)

Argon 

(Ar)

(mg/L)

Oxygen 

(O2)

(mg/L)

Carbon 

dioxide 

(CO2

)

(mg/L)

Methane 

(CH4

)

(mg/L)

Recharge 

temperature

(°C)

Excess air 

in water 

sample

(cc STP/L)

TS–60–34–301 302836095452701 4/22/2008 1330 18.71 0.64 0.49 26.81 0.0230 15.9 2.9

TS–60–34–301 302836095452701 4/22/2008 1330 18.56 .64 .38 26.68 .0222 16.4 2.9

YW-59–64–206 300542096045403 4/23/2008 1045 8.23 .31 .07 20.86 >40 -- --

YW-59–64–206 300542096045403 4/23/2008 1045 8.08 .30 .07 20.85 >40 -- --

TS–60–43–511 301904095414801 4/23/2008 1345 17.57 .61 1.36 41.81 <.0005 17.6 2.2

TS–60–43–511 301904095414801 4/23/2008 1345 17.29 .61 1.27 45.63 <.0005 17.9 2.1

TS–60–63–110 300642095131701 4/24/2008 1530 19.70 .68 .26 106.26 .0012 13.9 3.1

TS–60–63–110 300642095131701 4/24/2008 1530 19.72 .68 .25 106.44 .0011 13.8 3.1

TS–60–37–309 302850095241801 4/28/2008 1200 20.71 .70 .56 43.48 <.0005 12.5 3.9

TS–60–37–309 302850095241801 4/28/2008 1200 20.41 .70 .46 43.99 <.0005 12.8 3.7

TS–60–54–702 300958095221901 4/30/2008 1030 20.78 .66 1.44 81.11 <.0005 18.9 5.8

TS–60–54–702 300958095221901 4/30/2008 1030 20.44 .66 1.51 79.67 <.0005 18.8 5.4

TS–60–44–212 302014095343201 7/10/2008 1224 20.58 .72 .25 20.02 .0015 11.1 3.1

TS–60–44–212 302014095343201 7/10/2008 1224 20.47 .71 .23 19.92 .0016 11.5 3.1

TS–60–44–212 302014095343201 7/10/2008 1224 20.40 .71 .25 19.96 .0012 11.5 3.1

TS–60–55–710 300849095143301 7/16/2008 1630 18.44 .64 .24 5.05 <.0005 15.7 2.5

TS–60–55–710 300849095143301 7/16/2008 1630 18.48 .64 .23 5.05 <.0005 15.7 2.5

YU–60–28–802 303143095334801 7/17/2008 1620 17.70 .62 .23 2.20 .0778 16.7 2.1

YU–60–28–802 303143095334801 7/17/2008 1620 17.62 .62 .24 3.10 .0750 16.9 2.1

TS–60–45–114 302040095281701 7/18/2008 1135 17.30 .61 3.89 96.76 <.0005 17.0 1.8

TS–60–45–114 302040095281701 7/18/2008 1135 16.74 .60 4.65 88.45 <.0005 17.2 1.3

TS–60–53–210 301338095272301 7/21/2008 935 19.52 .66 1.20 18.35 <.0005 16.0 3.7

TS–60–53–210 301338095272301 7/21/2008 935 19.61 .66 .52 19.22 <.0005 16.0 3.7

TS–60–43–514 301917095413101 7/21/2008 1245 20.15 .70 .26 25.23 .0124 11.7 3.0

TS–60–43–514 301917095413101 7/21/2008 1245 19.77 .69 .26 24.78 .0122 12.1 2.7

TS–60–45–716 301614095284201 8/1/2008 845 20.52 .72 .24 21.26 .0053 11.1 3.0

TS–60–45–716 301614095284201 8/1/2008 845 20.21 .71 .23 21.16 .0045 11.2 2.7

TS–60–42–902 301612095450901 8/1/2008 1400 19.41 .66 2.52 47.01 <.0005 15.9 3.6

TS–60–42–902 301612095450901 8/1/2008 1400 19.51 .66 3.25 46.65 <.0005 16.0 3.7

TS–60–53–516 301228095272501 8/18/2008 1530 20.06 .70 .21 1.10 2.3809 11.9 2.8

TS–60–53–516 301228095272501 8/18/2008 1530 20.04 .70 .23 1.38 2.3926 12.0 2.8
22 Groundwater Environmental Tracer Data Collected from the Chicot, Evangeline, and Jasper Aquifers

Appendix 3. Dissolved-gas concentrations measured in groundwater samples collected from the Chicot, Evangeline, and Jasper 

aquifers in Montgomery County and adjacent counties, Texas, 2008 (samples analyzed by the U.S. Geological Survey Dissolved Gas 

Laboratory, Reston, Virginia)—Continued.

Station

name

Station

number

Sample

date

Sample

time

Nitrogen 

(N2

)

(mg/L)

Argon 

(Ar)

(mg/L)

Oxygen 

(O2)

(mg/L)

Carbon 

dioxide 

(CO2

)

(mg/L)

Methane 

(CH4)

(mg/L)

Recharge 

temperature

(°C)

Excess air 

in water 

sample

(cc STP/L)

TS–60–36–410 302651095362901 9/2/2008 950 18.23 0.63 0.23 17.39 0.0111 16.9 2.7

TS–60–36–410 302651095362901 9/2/2008 950 18.24 .63 .23 17.44 .0109 16.5 2.6

TS–60–35–907 302412095382101 9/2/2008 1215 19.28 .67 .25 21.03 .0090 13.4 2.6

TS–60–35–907 302412095382101 9/2/2008 1215 19.65 .68 .26 21.32 .0089 13.3 2.9

TS–60–37–806 302436095263501 9/3/2008 1245 20.36 .65 1.06 38.35 .0038 18.5 a

5.4

TS–60–37–806 302436095263501 9/3/2008 1245 17.13 .60 .22 37.45 .0039 18.8 2.1

TS–60–37–909 302452095242001 9/3/2008 1520 17.17 .59 .22 29.48 .0027 19.9 2.5

TS–60–37–909 302452095242001 9/3/2008 1520 17.19 .59 .22 29.40 .0023 2.1 2.6

TS–60–59–102 300658095443101 9/4/2008 915 17.91 .62 .83 14.17 <.0005 17.7 2.6

TS–60–59–102 300658095443101 9/4/2008 915 17.83 .61 .78 13.94 <.0005 18.2 2.7

TS–60–51–809 300853095412701 9/4/2008 1040 16.72 .60 1.55 67.56 <.0005 18.3 1.5

TS–60–51–809 300853095412701 9/4/2008 1040 16.70 .59 1.67 68.06 <.0005 18.6 1.6

TS–60–51–8XXB 300849095412601 9/4/2008 1140 16.59 .59 1.41 45.81 <.0005 18.4 1.4

TS–60–51–8XXB 300849095412601 9/4/2008 1140 16.64 .59 1.64 45.61 <.0005 18.4 1.5

TS–60–51–8XXA 300849095415701 9/4/2008 1415 16.80 .59 5.05 4.96 <.0005 18.5 1.7

TS–60–51–8XXA 300849095415701 9/4/2008 1415 16.91 .60 5.21 41.08 <.0005 18.2 1.7

TS–60–52–1xx 301332095361901 9/5/2008 900 19.23 .67 .25 8.97 .0014 13.9 2.7

TS–60–52–1xx 301332095361901 9/5/2008 900 19.31 .67 .25 8.99 .0010 13.5 2.7

TS–60–51–5xx 301057095421901 9/5/2008 1035 19.18 .65 .26 15.09 <.0005 15.8 3.3

TS–60–51–5xx 301057095421901 9/5/2008 1035 19.06 .65 .26 15.02 <.0005 15.7 3.1

a

 Slight leak in bottle.
Appendix 4 23

Appendix 4

Appendix 4. Sulfur hexafluoride and chlorofluorocarbons measured in groundwater samples collected from the Chicot, Evangeline, 

and Jasper aquifers in Montgomery County and adjacent counties, Texas, 2008 (samples analyzed by the U.S. Geological Survey 

Chlorofluorocarbon Laboratory, Reston, Virginia).

[Station name refers to State well number (TS, Montgomery County; YU, Walker County; YW, Waller County); 5-digit numbers are National Water Information System parameter codes; fg/kg, femtogram per kilogram; CFC, chlorofluorocarbon; pg/kg, picogram per kilogram; U, analyzed for, not detected; B, bottle 

broken in transit or at laboratory; --, no sample]

Station

name

Station

number

Sample

date

Sample

time

Sulfur 

hexafluoride, 

water, 

unfiltered

(fg/kg)

(63149)

CFC–113, for 

age dating, 

water, 

unfiltered

(pg/kg)

(50283)

CFC–12, for 

age dating, 

water, 

unfiltered

(pg/kg)

(50282)

CFC–11, for 

age dating, 

water, 

unfiltered

(pg/kg)

(50281)

TS–60–53–719 300824095274703 3/12/2008 1416 28.8 U 1.4 1.4

TS–60–53–719 300824095274703 3/12/2008 1417 20.1 U 1.2 1.3

TS–60–53–720 300824095274702 3/13/2008 1411 105 U 120 1.1

TS–60–53–720 300824095274702 3/13/2008 1412 105 U 120 1.1

TS–60–44–805 301505095343702 3/17/2008 1301 16.7 .3 2.4 4.1

TS–60–44–805 301505095343702 3/17/2008 1302 16.2 .6 3.3 3.3

TS–60–45–413 301948095290003 3/19/2008 846 19.6 13 14 33

TS–60–45–413 301948095290003 3/19/2008 847 B 18 16 31

TS–60–45–414 301948095290004 3/19/2008 1216 38.4 20 130 190

TS–60–45–414 301948095290004 3/19/2008 1217 40.4 21 140 190

TS–60–45–414 301948095290004 3/19/2008 1218 -- 22 120 200

TS–60–54–805 300833095173201 3/21/2008 1316 31.4 1.1 18 19

TS–60–54–805 300833095173201 3/21/2008 1317 14.9 1.1 18 17

TS–60–54–806 300833095173202 3/24/2008 1201 18.9 1 20 13

TS–60–54–806 300833095173202 3/24/2008 1202 10.5 1 18 11

TS–60–35–504 302636095422802 3/25/2008 1101 53 .1 7.2 11

TS–60–35–504 302636095422802 3/25/2008 1102 52.5 U 7.4 12

TS–60–35–505 302636095422803 3/25/2008 1331 35.3 1.9 27 41

TS–60–35–505 302636095422803 3/25/2008 1332 37.2 1.7 39 39

TS–60–35–505 302636095422803 3/25/2008 1333 -- 1.5 26 38
24 Groundwater Environmental Tracer Data Collected from the Chicot, Evangeline, and Jasper Aquifers

Appendix 4. Sulfur hexafluoride and chlorofluorocarbons measured in groundwater samples collected from the Chicot, Evangeline, 

and Jasper aquifers in Montgomery County and adjacent counties, Texas, 2008 (samples analyzed by the U.S. Geological Survey 

Chlorofluorocarbon Laboratory, Reston, Virginia)—Continued.

Station

name

Station

number

Sample

date

Sample

time

Sulfur 

hexafluoride, 

water, 

unfiltered

(fg/kg)

(63149)

CFC–113, for 

age dating,

water, 

unfiltered

(pg/kg)

(50283)

CFC–12, for 

age dating, 

water, 

unfiltered

(pg/kg)

(50282)

CFC–11, for 

age dating, 

water, 

unfiltered

(pg/kg)

(50281)

TS–60–54–807 300833095173203 3/26/2008 901 37.2 10 130 82

TS–60–54–807 300833095173203 3/26/2008 902 B 9 130 79

TS–60–54–807 300833095173203 3/26/2008 903 -- 8.1 120 72

TS–60–35–503 302636095422801 3/26/2008 1401 49.8 .8 1 10

TS–60–35–503 302636095422801 3/26/2008 1402 49.9 U .4 1

TS–60–35–503 302636095422801 3/26/2008 1403 -- U 1.2 2.9

TS–60–44–806 301505095343703 3/27/2008 1231 12 18 22 28

TS–60–44–806 301505095343703 3/27/2008 1232 24.3 25 22 41

TS–60–44–806 301505095343703 3/27/2008 1233 -- 25 22 29

TS–60–26–901 303222095455301 4/21/2008 1031 12.1 .3 4.1 2.6

TS–60–26–901 303222095455301 4/21/2008 1032 12.7 .4 2.9 5.4

TS–60–26–901 303222095455301 4/21/2008 1033 -- .4 2.8 1.4

TS–60–26–208 303610095484501 4/21/2008 1401 75.9 U .9 3.2

TS–60–26–208 303610095484501 4/21/2008 1402 86.2 U .9 3.4

TS–60–45–513 301912095253701 4/22/2008 931 23.8 .6 1.3 4.1

TS–60–45–513 301912095253701 4/22/2008 932 20.9 .6 3.3 11

TS–60–45–513 301912095253701 4/22/2008 933 -- .3 1.4 3.5

TS–60–34–301 302836095452701 4/22/2008 1331 31 1.9 11 16

TS–60–34–301 302836095452701 4/22/2008 1332 26.8 1.5 10 11

TS–60–34–301 302836095452701 4/22/2008 1333 -- 1.8 9.7 14

YW–59–64–206 300542096045403 4/23/2008 1046 11.9 .2 1.3 3.5

YW–59–64–206 300542096045403 4/23/2008 1047 8.35 U 1.4 3.1
Appendix 4 25

Appendix 4. Sulfur hexafluoride and chlorofluorocarbons measured in groundwater samples collected from the Chicot, Evangeline, 

and Jasper aquifers in Montgomery County and adjacent counties, Texas, 2008 (samples analyzed by the U.S. Geological Survey 

Chlorofluorocarbon Laboratory, Reston, Virginia)—Continued.

Station

name

Station

number

Sample

date

Sample

time

Sulfur 

hexafluoride, 

water, 

unfiltered

(fg/kg)

(63149)

CFC–113, for 

age dating, 

water, 

unfiltered

(pg/kg)

(50283)

CFC–12, for 

age dating, 

water, 

unfiltered

(pg/kg)

(50282)

CFC–11, for 

age dating, 

water, 

unfiltered

(pg/kg)

(50281)

TS–60–43–511 301904095414801 4/23/2008 1346 84.5 0.6 1.5 7.5

TS–60–43–511 301904095414801 4/23/2008 1347 86.3 .6 1.5 8

TS–60–63–110 300642095131701 4/24/2008 1531 19.4 1.2 15 8.3

TS–60–63–110 300642095131701 4/24/2008 1532 15.1 1.5 14 5.6

TS–60–37–309 302850095241801 4/28/2008 1201 23.6 2.3 13 15

TS–60–37–309 302850095241801 4/28/2008 1202 27 1.1 8.5 12

TS–60–37–309 302850095241801 4/28/2008 1203 -- 5.5 16 16

TS–60–54–702 300958095221901 4/30/2008 1031 63.8 12 78 140

TS–60–54–702 300958095221901 4/30/2008 1032 65.6 13 81 140

TS–60–44–212 302014095343201 7/10/2008 1225 13.8 1.1 1.7 5.1

TS–60–44–212 302014095343201 7/10/2008 1226 15.2 1.3 1.9 7.7

TS–60–55–710 300849095143301 7/16/2008 1631 60.6 3.2 2.5 7.7

TS–60–55–710 300849095143301 7/16/2008 1632 49.3 3.3 1.6 2.6

YU–60–28–802 303143095334801 7/17/2008 1621 66.4 10 27 4.8

YU–60–28–802 303143095334801 7/17/2008 1622 54.1 9.2 25 7.7

TS–60–45–114 302040095281701 7/18/2008 1136 28.5 6.9 170 81

TS–60–45–114 302040095281701 7/18/2008 1137 30.3 7.5 170 83

TS–60–53–210 301338095272301 7/21/2008 936 54.2 1.8 8.4 5.8

TS–60–53–210 301338095272301 7/21/2008 937 56.7 1.9 8 6.9

TS–60–53–210 301338095272301 7/21/2008 938 -- 3.1 9.9 13
26 Groundwater Environmental Tracer Data Collected from the Chicot, Evangeline, and Jasper Aquifers

Appendix 4. Sulfur hexafluoride and chlorofluorocarbons measured in groundwater samples collected from the Chicot, Evangeline, 

and Jasper aquifers in Montgomery County and adjacent counties, Texas, 2008 (samples analyzed by the U.S. Geological Survey 

Chlorofluorocarbon Laboratory, Reston, Virginia)—Continued.

Station

name

Station

number

Sample

date

Sample

time

Sulfur 

hexafluoride, 

water, 

unfiltered

(fg/kg)

(63149)

CFC–113, for 

age dating, 

water, 

unfiltered

(pg/kg)

(50283)

CFC–12, for 

age dating, 

water, 

unfiltered

(pg/kg)

(50282)

CFC–11, for 

age dating, 

water, 

unfiltered

(pg/kg)

(50281)

TS–60–43–514 301917095413101 7/21/2008 1246 18.1 1 0.9 U

TS–60–43–514 301917095413101 7/21/2008 1247 21.5 3.1 2.5 3.6

TS–60–43–514 301917095413101 7/21/2008 1248 -- 2 2.8 3.8

TS–60–45–716 301614095284201 8/1/2008 846 13 4.7 3 U

TS–60–45–716 301614095284201 8/1/2008 847 9.1 6 3.8 .1

TS–60–42–902 301612095450901 8/1/2008 1401 43.8 4.3 19 22

TS–60–42–902 301612095450901 8/1/2008 1402 42.5 3.8 20 22

TS–60–53–516 301228095272501 8/18/2008 1531 82.9 U 3.1 1.7

TS–60–53–516 301228095272501 8/18/2008 1532 79.8 U 3.4 2.1

TS–60–36–410 302651095362901 9/2/2008 951 10.2 .6 1.9 2.3

TS–60–36–410 302651095362901 9/2/2008 952 14.1 .6 1.5 2.4

TS–60–35–907 302412095382101 9/2/2008 1216 10.8 .6 1.6 2.8

TS–60–35–907 302412095382101 9/2/2008 1217 12.9 .4 1.6 1.9

TS–60–37–806 302436095263501 9/3/2008 1246 11.7 12 53 32

TS–60–37–806 302436095263501 9/3/2008 1247 14.7 4.4 2.1 3.3

TS–60–37–806 302436095263501 9/3/2008 1248 -- 2.3 3.1 4.4

TS–60–37–909 302452095242001 9/3/2008 1521 10.9 U .9 1.7

TS–60–37–909 302452095242001 9/3/2008 1522 6.1 U 1.5 3.1

TS–60–59–102 300658095443101 9/4/2008 916 42.8 1.4 1.9 3.4

TS–60–59–102 300658095443101 9/4/2008 917 41.2 1.6 8.7 8.8

TS–60–59–102 300658095443101 9/4/2008 918 -- U 1.7 3.6
Appendix 4 27

Appendix 4. Sulfur hexafluoride and chlorofluorocarbons measured in groundwater samples collected from the Chicot, Evangeline, 

and Jasper aquifers in Montgomery County and adjacent counties, Texas, 2008 (samples analyzed by the U.S. Geological Survey 

Chlorofluorocarbon Laboratory, Reston, Virginia)—Continued.

Station

name

Station

number

Sample

date

Sample

time

Sulfur 

hexafluoride, 

water, 

unfiltered

(fg/kg)

(63149)

CFC–113, for 

age dating, 

water, 

unfiltered

(pg/kg)

(50283)

CFC–12, for 

age dating, 

water, 

unfiltered

(pg/kg)

(50282)

CFC–11, for 

age dating, 

water, 

unfiltered

(pg/kg)

(50281)

TS–60–51–809 300853095412701 9/4/2008 1041 25.7 1.5 3.8 5

TS–60–51–809 300853095412701 9/4/2008 1042 18.3 1 3.9 5.8

TS–60–51–8XXB 300849095412601 9/4/2008 1141 25.4 U 1.8 3.1

TS–60–51–8XXB 300849095412601 9/4/2008 1142 28.8 U 3.1 2.9

TS–60–51–8XXB 300849095412601 9/4/2008 1143 -- .6 5.4 4.7

TS–60–51–8XXA 300849095415701 9/4/2008 1416 40.4 U 360 1.8

TS–60–51–8XXA 300849095415701 9/4/2008 1417 38.2 U 350 2.2

TS–60–52–1xx 301332095361901 9/5/2008 901 5.2 U 1.1 1.5

TS–60–52–1xx 301332095361901 9/5/2008 902 11.1 U 1.5 2.05

TS–60–51–5xx 301057095421901 9/5/2008 1036 54.4 U 1.1 .8

TS–60–51–5xx 301057095421901 9/5/2008 1037 62.8 2.7 2.3 2.6

TS–60–51–5xx 301057095421901 9/5/2008 1038 -- U 1.4 2.4
28 Groundwater Environmental Tracer Data Collected from the Chicot, Evangeline, and Jasper Aquifers

Appendix 5

Appendix 5. Tritium measured in groundwater samples collected from the Chicot, Evangeline, and Jasper aquifers in Montgomery 

County and adjacent counties, Texas, 2008 (samples analyzed by the U.S. Geological Survey Tritium Laboratory, Menlo Park, California).

[Station name refers to State well number (TS, Montgomery County; YU, Walker County; YW, Waller County); 07000, National Water Information parameter 

code; pCi/L, picocuries per liter; ssLc, sample specific critical level; R, radiochemical non-detect]

Station

name

Station

number

Sample 

date

Sample 

start time

Tritium, 

water, 

unfiltered

(pCi/L)

(07000)

ssLc Analysis

date

TS–60–53–719 300824095274703 3/12/2008 1415 R0.2 0.35 10/28/2009

TS–60–53–720 300824095274702 3/13/2008 1410 R-.1 .32 10/21/2009

TS–60–44–805 301505095343702 3/17/2008 1300 R0 .32 10/21/2009

TS–60–45–413 301948095290003 3/19/2008 845 .7 .32 10/21/2009

TS–60–45–414 301948095290004 3/19/2008 1215 5.5 .32 10/21/2009

TS–60–54–805 300833095173201 3/21/2008 1315 1.3 .32 10/21/2009

TS–60–54–806 300833095173202 3/24/2008 1200 R.2 .32 10/21/2009

TS–60–35–504 302636095422802 3/25/2008 1100 1.9 .32 10/21/2009

TS–60–35–505 302636095422803 3/25/2008 1330 7 .32 10/21/2009

TS–60–54–807 300833095173203 3/26/2008 900 .4 .32 10/21/2009

TS–60–35–503 302636095422801 3/26/2008 1400 R-.2 .32 10/21/2009

TS–60–44–806 301505095343703 3/27/2008 1230 .6 .32 10/21/2009

TS–60–26–901 303222095455301 4/21/2008 1030 R-.3 .32 10/21/2009

TS–60–26–208 303610095484501 4/21/2008 1400 R.1 .32 10/21/2009

TS–60–45–513 301912095253701 4/22/2008 930 R-.3 .38 10/28/2009

TS–60–34–301 302836095452701 4/22/2008 1330 R0 .38 10/28/2009

YW–59–64–206 300542096045403 4/23/2008 1045 R.1 .38 10/28/2009

TS–60–43–511 301904095414801 4/23/2008 1345 R0 .41 10/28/2009

TS–60–63–110 300642095131701 4/24/2008 1530 .5 .41 10/28/2009

TS–60–37–309 302850095241801 4/28/2008 1200 R.2 .35 10/28/2009
Appendix 5 29

Appendix 5. Tritium measured in groundwater samples collected from the Chicot, Evangeline, and Jasper aquifers in Montgomery 

County and adjacent counties, Texas, 2008 (samples analyzed by the U.S. Geological Survey Tritium Laboratory, Menlo Park, 

California)—Continued.

Station

name

Station

number

Sample 

date

Sample 

start time

Tritium, 

water, 

unfiltered

(pCi/L)

(07000)

ssLc Analysis

date

TS–60–54–702 300958095221901 4/30/2008 1030 9.4 0.38 10/28/2009

TS–60–44–212 302014095343201 7/10/2008 1224 .4 .35 10/28/2009

TS–60–55–710 300849095143301 7/16/2008 1630 .5 .32 11/7/2009

YU–60–28–802 303143095334801 7/17/2008 1620 R.2 .32 11/7/2009

TS–60–45–114 302040095281701 7/18/2008 1135 5.8 .32 11/7/2009

TS–60–53–210 301338095272301 7/21/2008 935 R.3 .32 11/7/2009

TS–60–43–514 301917095413101 7/21/2008 1245 R0 .35 11/7/2009

TS–60–45–716 301614095284201 8/1/2008 845 R.3 .35 11/7/2009

TS–60–42–902 301612095450901 8/1/2008 1400 R-.2 .35 11/7/2009

TS–60–53–516 301228095272501 8/18/2008 1530 R.1 .35 11/7/2009

TS–60–36–410 302651095362901 9/2/2008 950 .7 .32 11/7/2009

TS–60–35–907 302412095382101 9/2/2008 1215 .5 .32 11/7/2009

TS–60–37–806 302436095263501 9/3/2008 1245 R.2 .32 11/7/2009

TS–60–37–909 302452095242001 9/3/2008 1520 R.2 .32 11/7/2009

TS–60–59–102 300658095443101 9/4/2008 915 .8 .32 11/7/2009

TS–60–51–809 300853095412701 9/4/2008 1040 .5 .32 11/7/2009

TS–60–51–8XXB 300849095412601 9/4/2008 1140 .5 .38 10/28/2009

TS–60–51–8XXA 300849095415701 9/4/2008 1415 R.1 .32 11/7/2009

TS–60–52–1xx 301332095361901 9/5/2008 900 R.3 .38 10/28/2009

TS–60–51–5xx 301057095421901 9/5/2008 1035 R0 .38 10/28/2009
30 Groundwater Environmental Tracer Data Collected from the Chicot, Evangeline, and Jasper Aquifers

Appendix 6

Appendix 6. Helium-4 measured in groundwater samples collected from the Chicot, Evangeline, and Jasper aquifers in Montgomery 

County and adjacent counties, Texas, 2008 (samples analyzed by the U.S. Geological Survey Dissolved Gas Laboratory, Reston, Virginia). 

[Station name refers to State well number (TS, Montgomery County; YU, Walker County; YW, Waller County); cc/g STP, cubic centimeter per gram at standard 

temperature and pressure; H2O, water]

Station 

name

Station 

number

Sample 

date

Sample 

time

Helium-4, 

(cc/g STP H2

O)

TS–60–53–719 300824095274703 3/12/2008 1415 71 x 10-9

TS–60–53–720 300824095274702 3/13/2008 1410 57 x 10-9

TS–60–44–805 301505095343702 3/17/2008 1300 63 x 10-9

TS–60–45–413 301948095290003 3/19/2008 845 73 x 10-9

TS–60–45–414 301948095290004 3/19/2008 1215 68 x 10-9

TS–60–54–805 300833095173201 3/21/2008 1315 62 x 10-9

TS–60–54–806 300833095173202 3/24/2008 1200 65 x 10-9

TS–60–35–504 302636095422802 3/25/2008 1100 69 x 10-9

TS–60–35–505 302636095422803 3/25/2008 1330 83 x 10-9

TS–60–54–807 300833095173203 3/26/2008 900 75 x 10-9

TS–60–35–503 302636095422801 3/26/2008 1400 61 x 10-9

TS–60–44–806 301505095343703 3/27/2008 1230 61 x 10-9

TS–60–26–901 303222095455301 4/21/2008 1030 78 x 10-9

TS–60–26–208 303610095484501 4/21/2008 1400 74 x 10-9

TS–60–45–513 301912095253701 4/22/2008 930 73 x 10-9

TS–60–34–301 302836095452701 4/22/2008 1330 86 x 10-9

YW–59–64–206 300542096045403 4/23/2008 1045 723 x 10-9

TS–60–43–511 301904095414801 4/23/2008 1345 80 x 10-9

TS–60–63–110 300642095131701 4/24/2008 1530 75 x 10-9

TS–60–37–309 302850095241801 4/28/2008 1200 73 x 10-9
Appendix 6 31

Appendix 6. Helium-4 measured in groundwater samples collected from the Chicot, Evangeline, and Jasper aquifers in Montgomery 

County and adjacent counties, Texas, 2008 (samples analyzed by the U.S. Geological Survey Dissolved Gas Laboratory, Reston, 

Virginia)—Continued. 

Station 

name

Station 

number

Sample 

date

Sample 

time

Helium-4, 

(cc/g STP H2

O)

TS–60–54–702 300958095221901 4/30/2008 1030 75 x 10-9

TS–60–44–212 302014095343201 7/10/2008 1224 219 x 10-9

TS–60–55–710 300849095143301 7/16/2008 1630 90 x 10-9

YU–60–28–802 303143095334801 7/17/2008 1620 76 x 10-9

TS–60–45–114 302040095281701 7/18/2008 1135 61 x 10-9

TS–60–53–210 301338095272301 7/21/2008 935 83 x 10-9

TS–60–43–514 301917095413101 7/21/2008 1245 313 x 10-9

TS–60–45–716 301614095284201 8/1/2008 845 198 x 10-9

TS–60–42–902 301612095450901 8/1/2008 1400 54 x 10-9

TS–60–53–516 301228095272501 8/18/2008 1530 458 x 10-9

TS–60–36–410 302651095362901 9/2/2008 950 144 x 10-9

TS–60–35–907 302412095382101 9/2/2008 1215 167 x 10-9

TS–60–37–806 302436095263501 9/3/2008 1245 83 x 10-9

TS–60–37–909 302452095242001 9/3/2008 1520 75 x 10-9

TS–60–59–102 300658095443101 9/4/2008 915 72 x 10-9

TS–60–51–809 300853095412701 9/4/2008 1040 63 x 10-9

TS–60–51–8XXB 300849095412601 9/4/2008 1140 61 x 10-9

TS–60–51–8XXA 300849095415701 9/4/2008 1415 65 x 10-9

TS–60–52–1xx 301332095361901 9/5/2008 900 219 x 10-9

TS–60–51–5xx 301057095421901 9/5/2008 1035 170 x 10-9
32 Groundwater Environmental Tracer Data Collected from the Chicot, Evangeline, and Jasper Aquifers

Appendix 7

Appendix 7. Helium, tritium, and neon measured in groundwater samples collected from the Chicot, Evangeline, and Jasper aquifers 

in Montgomery County and adjacent county, Texas, 2008 (samples analyzed by the Noble Gas Laboratory of Lamont-Doherty Earth 

Observatory of Columbia University, Palisades, New York).

[Station name refers to State well number (TS, Montgomery County; YU, Walker County); TU, tritium unit; 1σ, combined standard uncertainty; δ, delta; 

%, percent; cc STP/g, cubic centimeters at standard temperature and pressure per gram; H2O, water; --, not analyzed; a, terrigenic helium; b, negative delta neon 

value; c, high helium in tritium bulb; d, possible gas fractionation; e, helium broken; f, sampled pumped, high gas pressure; g, possible air contamination during 

sampling; h, delta helium and delta neon equal, gas loss during sampling or in situ; i, low tritium sample; j, improper seal on copper tube or ends deformed; 

k, no second sample received; l, sample cannot be dated, low tritium and high terrigenic helium concentrations indicate “old water”]

Station

namea

Sample

date

Sample 

time

Helium 

extraction 

date

Helium 

measurement date

Channel 1 

tritium

(TU)

Channel 1 

tritium 

error

(1σ)

Channel 2 

tritium

(TU)

Channel 2 

tritium 

error

(1σ)

Tritium 

from bottle 

sample

(TU)

Tritium 

error from 

bottle 

sample

(1σ)

TS–60–53–719 3/12/2008 1415 9/10/2008 9/12/2008 0.20 0.06 -- -- 0.04 0.05

TS–60–53–720 3/13/2008 1410 9/12/2008 10/2/2008 .32 .06 -- -- .07 .06

TS–60–44–805 3/17/2008 1300 9/10/2008 9/11/2008 .14 .06 -- -- .04 .05

TS–60–45–413 3/19/2008 845 -- -- .35 .07 -- -- .34 .05

TS–60–45–414 3/19/2008 1215 9/10/2008 9/11/2008 1.84 .07 -- -- 2.02 .07

TS–60–54–805 3/21/2008 1315 9/10/2008 9/12/2008 .52 .06 -- -- .60 .05

TS–60–54–806 3/24/2008 1200 9/10/2008 9/12/2008 .24 .05 -- -- .17 .05

TS–60–35–504 3/25/2008 1100 9/10/2008 9/11/2008 .00 .04 -- -- .83 .05

TS–60–35–505 3/25/2008 1330 9/12/2008 10/2/2008 -1.81 .09 -- -- 2.24 .06

TS–60–54–807 3/26/2008 900 9/10/2008 9/12/2008 .28 .05 -- -- .04 .04

TS–60–35–503 3/26/2008 1400 9/10/2008 9/12/2008 .12 .06 -- -- .05 .05

TS–60–44–806 3/27/2008 1230 9/12/2008 10/2/2008 -.02 .04 -- -- .38 .06
Appendix 7 33

Appendix 7. Helium, tritium, and neon measured in groundwater samples collected from the Chicot, Evangeline, and Jasper aquifers 

in Montgomery County and adjacent county, Texas, 2008 (samples analyzed by the Noble Gas Laboratory of Lamont-Doherty Earth 

Observatory of Columbia University, Palisades, New York)—Continued.

Station

namea

δ Helium-3 

uncorrected

(%)

δ Percent 

helium-3 

error

(1s)

Helium-4

(cc STP/g H2

0)

δ Helium-4, 1σ

(+/- cc STP/g H20)

Neon

(cc STP/g H20)

δ Neon, 1σ

(+/- cc STP/g H20)

Lab 

comments

TS–60–53–719 -6.23 0.31 5.96E-08 2.20E-10 1.56E-07 8.10E-10 a,b

TS–60–53–720 -5.02 .02 5.91E-08 1.00E-10 2.31E-07 7.60E-10 a,c

TS–60–44–805 -7.39 .15 6.27E-08 9.00E-11 3.03E-07 1.41E-08 a,c,d

TS–60–45–413 -- -- -- -- -- -- e,f

TS–60–45–414 15.27 .15 5.68E-08 8.00E-11 28.713 1.313 d

TS–60–54–805 5.95 .30 5.98E-08 2.20E-10 5.16E-07 5.41E-09 d,g

TS–60–54–806 .03 .30 6.69E-08 2.50E-10 1.89E-07 1.03E-09 a

TS–60–35–504 18.49 .15 5.92E-08 8.00E-11 2.909E-07 1.362E-08 a

TS–60–35–505 42.32 .17 6.42E-08 1.10E-10 2.612E-07 8.700E-10 c,h

TS–60–54–807 .15 .31 6.01E-08 2.20E-10 2.55E-07 2.01E-09 d

TS–60–35–503 -10.54 .31 5.88E-08 2.20E-10 2.326E-07 1.370E-09 h,i

TS–60–44–806 2.73 .18 6.28E-08 1.10E-10 2.67E-07 8.80E-10 d
34 Groundwater Environmental Tracer Data Collected from the Chicot, Evangeline, and Jasper Aquifers

Appendix 7. Helium, tritium, and neon measured in groundwater samples collected from the Chicot, Evangeline, and Jasper aquifers 

in Montgomery County and adjacent county, Texas, 2008 (samples analyzed by the Noble Gas Laboratory of Lamont-Doherty Earth 

Observatory of Columbia University, Palisades, New York)—Continued.

Station

namea

Sample

date

Sample 

time

Helium 

extraction 

date

Helium 

measurement date

Channel 1 

tritium

(TU)

Channel 1 

tritium 

error

(1σ)

Channel 2 

tritium

(TU)

Channel 2 

tritium 

error

(1σ)

Tritium 

from 

bottle 

sample

(TU)

Tritium 

error from 

bottle 

sample

(1σ)

TS–60–26–901 4/21/2008 1030 9/12/2008 10/2/2008 0.16 0.06 -- -- -0.32 0.05

TS–60–26–208 4/21/2008 1400 9/12/2008 10/2/2008 .04 .05 -- -- .08 .06

TS–60–45–513 4/22/2008 930 9/12/2008 10/2/2008 .15 .05 2.02 0.05 .06 .05

TS–60–34–301 4/22/2008 1330 9/12/2008 10/2/2008 .11 .06 -- -- .04 .05

TS–60–43–511 4/23/2008 1345 9/12/2008 10/2/2008 .19 .05 -- -- -.11 .05

TS–60–63–110 4/24/2008 1530 10/22/2008 12/22/2008 -- -- -- -- .08 .05

TS–60–37–309 4/28/2008 1200 -- -- -- -- .09 .06 .05 .05

TS–60–54–702 4/30/2008 1030 10/22/2008 12/22/2008 2.77 .08 -- -- 2.50 .07

TS–60–55–710 7/16/2008 1630 2/16/2009 6/1/2009 .08 .13 -- -- .10 .06

YU–60–28–802 7/17/2008 1620 2/16/2009 6/1/2009 -.08 .13 .08 .06 .09 .06

TS–60–45–114 7/18/2008 1135 2/16/2009 6/1/2009 1.57 .14 -- -- 1.72 .07

TS–60–53–210 7/21/2008 935 2/16/2009 6/1/2009 -.02 .13 .06 .05 .06 .05
Appendix 7 35

Appendix 7. Helium, tritium, and neon measured in groundwater samples collected from the Chicot, Evangeline, and Jasper aquifers 

in Montgomery County and adjacent county, Texas, 2008 (samples analyzed by the Noble Gas Laboratory of Lamont-Doherty Earth 

Observatory of Columbia University, Palisades, New York)—Continued.

Station

namea

δ Helium-3 

uncorrected

(%)

δ Percent 

helium-3 

error

(1s)

Helium-4

(cc STP/g H2

0)

δ Helium-4, 1σ

(+/- cc STP/g H20)

Neon

(cc STP/g H20)

δ Neon, 1σ

(+/- cc STP/g H20)

Lab 

comments

TS–60–26–901 -14.06 0.02 6.57E-08 1.20E-10 2.397E-07 8.000E-10 a,i

TS–60–26–208 -6.66 .02 6.90E-08 1.20E-10 2.584E-07 8.600E-10 a,i

TS–60–45–513 -11.43 .18 6.70E-08 1.10E-10 2.468E-07 8.200E-10 a,c

TS–60–34–301 -25.03 .18 7.67E-08 1.30E-10 2.380E-07 8.000E-10 a,i

TS–60–43–511 -23.25 .20 3.70E-08 7.00E-11 9.049E-08 3.000E-10 a,h,i

TS–60–63–110 -2.08 .46 6.38E-08 3.30E-10 2.480E-07 8.300E-10 j

TS–60–37–309 -- -- -- -- -- -- j,k

TS–60–54–702 40.14 .05 6.16E-08 3.10E-10 2.558E-07 8.400E-10 d

TS–60–55–710 -26.25 .18 8.78E-08 9.00E-11 2.596E-07 3.390E-09 a,i,l

YU–60–28–802 -26.08 .02 7.64E-08 6.00E-11 2.291E-07 2.600E-09 a,i,l

TS–60–45–114 32.1 .04 5.42E-08 3.00E-11 2.180E-07 2.570E-09

TS–60–53–210 -11.5 .23 7.23E-08 6.00E-11 2.593E-07 3.390E-09 a,i,l
36 Groundwater Environmental Tracer Data Collected from the Chicot, Evangeline, and Jasper Aquifers

Appendix 7. Helium, tritium, and neon measured in groundwater samples collected from the Chicot, Evangeline, and Jasper aquifers 

in Montgomery County and adjacent county, Texas, 2008 (samples analyzed by the Noble Gas Laboratory of Lamont-Doherty Earth 

Observatory of Columbia University, Palisades, New York)—Continued.

Station

namea

Sample

date

Sample 

time

Helium 

extraction 

date

Helium 

measurement date

Channel 1 

tritium

(TU)

Channel 1 

tritium 

error

(1σ)

Channel 2 

tritium

(TU)

Channel 2 

tritium 

error

(1σ)

Tritium 

from 

bottle 

sample

(TU)

Tritium 

error from 

bottle 

sample

(1σ)

TS–60–45–716 8/1/2008 845 2/16/2009 6/1/2009 -0.02 0.12 -- -- 0.08 0.05

TS–60–42–902 8/1/2008 1400 2/16/2009 6/1/2009 .08 .13 -- -- .10 .06

TS–60–36–410 9/2/2008 950 2/16/2009 6/1/2009 -.01 .10 -- -- .07 .05

TS–60–35–907 9/2/2008 1215 2/18/2009 5/31/2009 -.08 .14 -- -- .01 .05

TS–60–37–806 9/3/2008 1245 2/18/2009 5/31/2009 .07 .15 -- -- .15 .06

TS–60–37–909 9/3/2008 1520 2/18/2009 5/31/2009 .23 .12 -- -- .04 .06

TS–60–59–102 9/4/2008 915 2/18/2009 6/1/2009 -.05 .13 -- -- .21 .06

TS–60–51–809 9/4/2008 1040 2/18/2009 6/1/2009 .00 .10 -- -- .07 .06

TS–60–51–8XXB 9/4/2008 1140 2/18/2009 6/1/2009 .02 .13 -- -- -.11 .06

TS–60–51–8XXA 9/4/2008 1415 2/18/2009 6/1/2009 -.01 .11 -- -- .07 .05

TS–60–51–5xx 9/5/2008 1035 2/19/2009 5/31/2009 .17 .14 -- -- .14 .06

a

 Samples from five wells not analyzed due to excess helium.
Appendix 7 37

Appendix 7. Helium, tritium, and neon measured in groundwater samples collected from the Chicot, Evangeline, and Jasper aquifers 

in Montgomery County and adjacent county, Texas, 2008 (samples analyzed by the Noble Gas Laboratory of Lamont-Doherty Earth 

Observatory of Columbia University, Palisades, New York)—Continued.

Station

namea

δ Helium-3 

uncorrected

(%)

δ Percent 

helium-3 

error

(1s)

Helium-4

(cc STP/g H2

0)

δ Helium-4, 1σ

(+/- cc STP/g H20)

Neon

(cc STP/g H20)

d Neon, 1σ

(+/- cc STP/g H20)

Lab 

comments

TS–60–45–716 -70.44 0.07 2.01E-07 7.00E-11 2.437E-07 2.980E-09 a,i,l

TS–60–42–902 -2.8 .26 6.25E-08 4.00E-11 2.507E-07 3.150E-09 a,i,l

TS–60–36–410 -61.31 .10 1.41E-07 2.60E-10 2.242E-07 2.490E-09 a,i,l

TS–60–35–907 -66.75 .10 1.67E-07 4.30E-10 2.294E-07 2.260E-09 a,i,l

TS–60–37–806 -27.7 .19 7.52E-08 7.00E-11 2.228E-07 2.200E-09 a,i,l

TS–60–37–909 -32.29 .20 7.58E-08 7.00E-11 2.181E-07 2.010E-09 a,i,l

TS–60–59–102 -13.07 .24 6.38E-08 4.00E-11 2.298E-07 2.570E-09 a,i,l

TS–60–51–809 -5.48 .26 5.37E-08 3.00E-11 2.124E-07 2.160E-09 a,i,l

TS–60–51–8XXB -5.21 .27 5.33E-08 3.00E-11 2.108E-07 2.160E-09 a,i,l

TS–60–51–8XXA -19.07 .26 6.50E-08 4.00E-11 2.175E-07 2.300E-09 a,i,l

TS–60–51–5xx -68.23 .10 1.82E-07 6.10E-10 2.378E-07 2.520E-09 a,i,l

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