QUALITY OF WATER IN THE RED RIVER ALLUVIAL AQUIFER, …AQUIFER, POOL 1, RED RIVER WATERWAY AREA,...

QUALITY OF WATER IN THE RED RIVER ALLUVIAL AQUIFER, POOL 1, RED RIVER WATERWAY AREA, Vick, LOUISIANA

By Charles W. Smoot, Ronald C. Seanor, and G.F. Huff

U.S. Geological Survey

Water-Resources Investigations Report 93-4184

Prepared in cooperation with the

U.S. ARMY CORPS OF ENGINEERS, VICKSBURG DISTRICT

Baton Rouge, Louisiana

1994

U.S. DEPARTMENT OF THE INTERIOR

BRUCE BABBITT, Secretary

U.S. GEOLOGICAL SURVEY

Gordon P. Eaton, Director

For additional information write to: Copies of this report can be purchasedfrom:

District Chief U.S. Geological Survey U.S. Geological Survey Earth Science Information Center 3535 S. Sherwood Forest Blvd., Suite 120 Open-File Reports Section Baton Rouge, LA 70816 Box 25286, MS 517

Denver Federal Center Denver, CO 80225

Chief, Engineering Division U.S. Army Corps of Engineers Vicksburg District P.O. Box 60, CELMK-ED-FT Vicksburg, MS 39181

CONTENTSPage

Abstract....................................................................................................................................................... 1Introduction ................................................ 1

Purpose and scope ........................................................................................................................... 2Description of study area................................................................................................................... 2Previous studies................................................................................................................................ 4

Hydrogeology.............................................................................................................................................. 4Data collection............................................................................................................................................ 5Quality of water........................................................................................................................................... 5

Total hardness................................................................................................................................... 15Dissolved chloride............................................................................................................................. 22Dissolved iron.................................................................................................................................... 22Dissolved manganese....................................................................................................................... 25

Summary and conclusions.......................................................................................................................... 27Selected references.................................................................................................................................... 27

ILLUSTRATIONS

Figure 1. Map showing location of pool 1 study area and selected wells completed in the RedRiver alluvial aquifer, Louisiana............................................................................................... 3

2-19. Graphs showing total hardness and concentrations of dissolved chloride, iron, and manganese in water from well:

2. Av-153 completed in the Red River alluvial aquifer, from pre-construction (1974-78) to post-construction (1984-92) of Lock and Dam 1 on the Red River, La...................... 6

3. Av-331 completed in the Red River alluvial aquifer, during the pre-construction (1974-78) and post-construction (1984-92) periods of Lock and Dam 1 on the Red River, La......................................................................................................................... 6


5. Av-339 completed in the Red River alluvial aquifer, during the pre-construction (1974-78) and post-construction (1984-92) periods of Lock and Dam 1 on the Red River, La......................................................................................................................... 7

6. Av-364 completed in the Red River alluvial aquifer, during pre-construction(1974-78) of Lock and Dam 1 on the Red River, La...................................................... 8



9. Av-372A completed in the Red River alluvial aquifer, from pre-construction (1974-78) to post-construction (1984-92) of Lock and Dam 1 on the Red River, La...................... 9

10. Av-381 completed in the Red River alluvial aquifer, from pre-construction (1976-78)to post-construction (1984-92) of Lock and Dam 1 on the Red River, La...................... 10

11. Av-382 completed in the Red River alluvial aquifer, from pre-construction (1976-78)to post-construction (1984-92) of Lock and Dam 1 on the Red River, La...................... 10

12. Ct-74 completed in the Red River alluvial aquifer, from pre-construction (1974-78)to post-construction (1984-92) of Lock and Dam 1 on the Red River, La...................... 11



111

Figures-Continued

Page

15. Ct-96 completed in the Red River alluvial aquifer, during the pre-construction (1974-78) and post-construction (1984-92) periods of Lock and Dam 1 on the Red River, La......................................................................................................................... 12

16. R-733 completed in the Red River alluvial aquifer, during the construction(1980-83) and post-construction (1984-92) periods of Lock and Dam 1 on the Red River, La......................................................................................................................... 13

17. R-744 completed in the Red River alluvial aquifer, from pre-construction (1974-78)to post-construction (1984-92) of Lock and Dam 1 on the Red River, La...................... 13



20. Map showing changes in median values of total hardness of water from wellscompleted in the Red River alluvial aquifer, from pre-construction (1974-78) to post- construction (1984-92) of Lock and Dam 1 on the Red River, La........................................ 21

21. Map showing changes in median concentration of dissolved chloride in water from wells completed in the Red River alluvial aquifer, from pre-construction (1974-78) to post-construction (1984-92) of Lock and Dam 1 on the Red River, La............ 23

22. Map showing changes in median concentration of dissolved iron in water from wells completed in the Red River alluvial aquifer, from pre-construction (1974-78) to post-construction (1984-92) of Lock and Dam 1 on the Red River, La............ 24

23. Map showing changes in median concentration of dissolved manganese in water from wells completed in the Red River alluvial aquifer, from pre-construction (1974-78) to post-construction (1984-92) of Lock and Dam 1 on the Red River, La............ 26

TABLES

Table 1. Summary of chemical and physical analyses of water from wells completed in theRed River alluvial aquifer, Louisiana, 1965-92................................................................. at back

2. Statistical analysis of total hardness and concentrations of dissolved chloride, iron, and manganese in water from selected wells completed in the Red River alluvial aquifer, during pre-construction (1974-78) and post-construction (1984-92) periods of Lock and Dam 1 on the Red River, Louisiana.................................................................. 16

3. Summary of changes in median values of total hardness and median concentra tions of dissolved chloride, iron, and manganese in water from selected wells completed in the Red River alluvial aquifer, from pre-construction (1974-78) to post- construction (1984-92) of Lock and Dam 1 on the Red River, Louisiana............................. 20

IV

CONVERSION FACTORS, VERTICAL DATUM, AND ABBREVIATED WATER-QUALITY UNITS

Multiply

foot (ft) inch (in.) mile (mi)

million gallons per day (Mgal/d)

By

0.3048 25.4

1.609 0.04381

To obtain

meter millimeter kilometer cubic meters per second

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

Sea level: In this report, "sea level" refers to the National Geodetic Vertical Datum of 1929 (NGVD of 1929) 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:

micrograms per liter (H-g/L)

microsiemens per centimeter at 25 degrees Celsius (^.S/cm)

milligrams per liter (mg/L)

QUALITY OF WATER IN THE RED RIVER ALLUVIAL AQUIFER, POOL 1, RED RIVER WATERWAY AREA,

Vick, LOUISIANA

By Charles W. Smoot, Ronald C. Seanor, and G.F. Huff

Abstract

Water-quality changes in the Red River alluvial aquifer within the area affected by pool 1 near Vick, Louisiana, were monitored during pre-construction (1974-78) and post-construction (1984-92) of Lock and Dam 1. Changes greater or less than background values have occurred in an area within 2 miles of Lock and Dam 1, and in one well located about 10 miles west of Lock and Dam 1.

Comparison between the pre-construction and post-construction water-quality analyses indicated the total hardness as calcium carbonate and concentrations of dissolved chloride, iron, and manganese generally have decreased in the Red River alluvial aquifer south of the Red River and near Lock and Dam 1. The maximum decrease of the median total hardness as calcium carbonate was from 730 to 330 mg/L (milligrams per liter), dissolved chloride from 77 to 46 mg/L, dissolved iron from 18 to 6.9 mg/L, and dissolved manganese from 1.4 to 0.56 mg/L. Analyses of water from wells west of Lock and Dam 1 indicated an increase of the median total hardness as calcium carbonate was from 200 to 260 mg/L, and dissolved iron concentration was from 0.33 to 1.4 mg/L. North of the river and 1 mile west of Lock and Dam 1, the median concentration of dissolved chloride increased from 45 to 130 mg/L in water from one well, and median total hardness as calcium cabonate and concentrations of dissolved iron and manganese also increased. Because well Ct-74 is completed in a sand that is in contact with a saltwater sand of Tertiary age, this increase is probably a temporal increase due to upconing after lowering the water level in the alluvial aquifer by pumping of dewatering wells during construction of Lock and Dam 1.

INTRODUCTION

The Red River alluvial aquifer is the only source of fresh ground water within the Red River Valley in the area affected by the impoundment of water by Lock and Dam 1 (pool 1). The structure was completed on the Red River waterway near Vick, Louisiana, in March 1984. The aquifer provides water for irrigation and domestic use, but the water for public supply or industrial use requires treatment (reduction or removal of hardness and iron) before use. In addition, water from the aquifer has a relatively low and constant temperature, which makes it suitable for other uses such as industrial cooling.

The Red River alluvial aquifer is an important resource in the valley, and knowledge of the effects of the construction and operation of Lock and Dam 1 on its quality of water is needed. In response to this need, the U.S. Geological Survey, in cooperation with the U.S. Army Corps of

Engineers, began a study in 1974 to determine the quality of water in the aquifer. The study included the systematic collection and analysis of selected water-quality samples from the Red River alluvial aquifer during the following periods: (1) Prior to construction (pre-construction, 1974-78), (2) during construction (1979-83), and (3) after construction (post-construction, 1984-92) of a lock and dam structure on the Red River waterway. In 1978, 64 wells with a combined pumping rate of more than 100 Mgal/d were installed to dewater the Red River alluvial aquifer at the construction site for Lock and Dam 1. About half of these wells were pumped, most of the time, from January 1979 to March 1984 (Adolfo Ramirez, U.S. Army Corps of Engineers, oral commun., 1992).

Purpose and Scope

This report describes the effects of construction and operation of Lock and Dam 1 on the Red River on water quality in the Red River alluvial aquifer in the pool 1 area. Specifically, water-quality changes were evaluated from analyses of hardness and three constituents in water from wells completed in the Red River alluvial aquifer. The three constituents are dissolved chloride, dissolved iron, and dissolved manganese. The changes were determined by statistical analysis of data collected from 1974 to 1978 (pre-construction) and from 1984 to 1992 (post-construction). Graphs also were used to evaluate water-quality changes in the aquifer. The graphs illustrate the changes from 1974 to 1992 in values of total hardness and concentrations of dissolved chloride, iron, and manganese in selected wells.

Results of an extensive suite of water-quality analyses of water samples collected from 88 wells in the pool 1 area from 1974 to 1992 also are tabulated. These water-quality analyses establish a broad water-quality data base for the Red River alluvial aquifer. Periodic sampling of 18 of these wells in the study area was continued through 1990 and sampling of 5 of these wells was continued through 1992 to document the quality of water in the Red River alluvial aquifer during the pre- construction, construction, and post-construction periods of Lock and Dam 1. Water-quality analyses for samples collected from 18 selected wells completed in the Red River alluvial aquifer (located between Lock and Dams 1 and 2) are presented in a table. Analyses for water-quality samples collected prior to 1974 also are included in this table. All data are on file at the U.S. Geological Survey.

Description of Study Area

The pool 1 study area (fig. 1) for this report is within the Red River Valley in the State of Louisiana and extends from Lock and Dam 1, in Catahoula Parish, upstream to Lock and Dam 2, in Rapides Parish. Lock and Dam 1 is located about 10 mi upstream (west) of the confluence of the Black and Red Rivers. Lock and Dam 1 is located about 40 mi downstream from Lock and Dam 2. The pool 1 study area includes parts of Avoyelles, Catahoula, and Rapides Parishes. Normal design operating conditions for Lock and Dam 1 call for an upstream pool altitude of 40 ft and a downstream river altitude of about 4 ft (Smoot and Martin, 1991, sheet 1).

The flood plain in this area ranges from 10 mi to more than 20 mi wide. The altitude of land surface in the valley ranges from an average of 40 ft in Avoyelles Parish to an average of 65 ft above sea level in southeastern Rapides Parish. The annual precipitation ranges from 45 to 65 in. The primary land use is agriculture.

92° 15' 92 00'

31 U 15' -

T. 4 N.

T. 3 N.

T. 2 N.

T. 1 N.

R. 2 E. R. 3 E. R. 4 E. R. 5 E. R. 6 E.

EXPLANATION

Av-339 OBSERVATION WELL AND WELL NUMBER

STUDY AREA

INDEX MAP

Figure 1. Location of pool 1 study area and selected wells completed in the Red River alluvial aquifer, Louisiana.

Previous Studies

Water-quality analyses from wells in the Red River alluvial aquifer collected through 1978 were compiled in a report by Whitfield (1980). Also in Whitfield's report are maps showing areal distribution of selected water-quality properties and constituents in water from wells in the aquifer. Tabulation of water-quality data collected from 1978 to 1985 was compiled by Smoot and Guillot (1988). Potentiometric surfaces of the Red River alluvial aquifer, pool 1, are illustrated in a map report by Smoot and Martin (1991).

HYDROGEOLOGY

The Red River alluvium lies unconformably on the eroded surface of sediments of Tertiary age and ranges from about 100 to 200 ft in thickness within the study area. The alluvium grades downward from clay and silt at the surface to sand and gravel at the base. The overlying surficial clay and silt of Holocene age ranges in thickness from a few feet to more than 50 ft.

The lower, coarse-grained section of the alluvium is the Red River alluvial aquifer of Pleistocene age. Gravel is common near the base of the aquifer, and the base of the aquifer generally is marked by the deepest occurrence of gravel (Whitfield, 1980, p. 6). The alluvial aquifer ranges in thickness from 40 to 170 ft within the study area. At places, the Red River alluvial aquifer is hydraulically connected to a sand of Tertiary age, as the drillers log of well Ct-74 indicates (Smoot, 1983, p. 79). Chemical analysis and electric log interpretations indicate the water from this sand is salty.

Water in the alluvial aquifer generally is confined by overlying beds of clay and silt. Water enters the aquifer by infiltration of precipitation through these confining units. Because of large differences of hydraulic conductivity between the confining units and the aquifer, the aquifer acts according to artesian principles. This is confirmed by the low coefficients of storage calculated from pumping tests (Whitfield, 1980, p. 6). Locally, confining units are absent, and water-table conditions prevail. In areas where confining units are thin, water-table conditions can prevail during periods of low water level.

The direction of ground-water flow under average conditions is similar to flow prior to and after construction of the lock and dam structure for most of the study area. However, the post- construction flow near and upstream from the structure is from the river to the aquifer, a reversal of the pre-construction gradient. The reversal of gradient occurs along the south side of the Red River in Avoyelles Parish, from 4 mi upstream of the structure to about 2 mi east of the Avoyelles-Rapides Parish boundary line. Potentiometric surface maps indicate the direction of flow is away from the river in a band about 3 mi wide when the direction becomes down valley. (See Smoot and Martin, 1991.)

The Red River alluvial aquifer is recharged by infiltration of rainfall in the valley, by lateral movement of water from adjacent hydrogeologic units of Pleistocene and Tertiary age, and by upward movement of water from underlying hydrogeologic units of Tertiary age. Also, the Red River and its major tributaries recharge the aquifer in local zones near the river during high stream stages (Whitfield, 1980, p. 1).

Higher average river stage resulting from the operation of Lock and Dam 1 near Vick, La., can cause higher ground-water levels in the alluvial aquifer. Relation between the higher stages of the river and water quality in the aquifer is not known at this time. However, in places where the water- level head in the Red River alluvial aquifer is higher than the underlying saltwater aquifer the

discharge from the underlying aquifer would be reduced. In these places the chloride concentration can decrease and the hardness and iron concentrations can increase.

DATA COLLECTION

Within the study area 15 observation wells located at 8 sites have been sampled periodically between 1974 and 1990. From 1974 through 1987 most of these wells were sampled two times per year; once in the spring (high water) and once in the fall (low water). From 1988 to 1990 these wells were sampled once in the spring. Five of these wells (Av-370, Av-372A, Ct-74, Ct-96 and R-963) also were sampled in 1991 and 1992. In addition to these 15 wells, two other wells (Av-331 and Av- 339) were sampled three times during the period 1974-76, and were sampled two more times during the period 1988-89. Also, well R-733 has been sampled periodical since 1980, but was only sampled three times prior to the start of construction of the lock and dam, with two of these samples being collected in 1958.

All the water-quality samples were collected from observation wells, using a suction-type pump or by pumping with air. All the wells except Av-372A and Ct-96 are finished with 3-foot long screen with a slot size of 0.010 or 0.012 in. Wells Av-372A and Ct-96 are finished with 10- and 5-foot long screens. The samples were collected and processed according to standard methods established for ground-water sampling (American Public Health Association and others, 1980; Brown and others, 1970). Samples were filtered and acidified in the field for later analysis by a U.S. Geological Survey laboratory. Temperature and pH were determined in the field using procedures described by Wood (1976). Also field determination of alkalinity as calcium carbonate and specific conductance were determined on selected samples. Most of the water-quality samples were analyzed in the laboratory for selected properties and constituents, including total hardness as calcium carbonate and concentrations of dissolved calcium, magnesium, sulfate, chloride, iron, and manganese. The samples were analyzed according to standard methods established for determination of inorganic substances in water (Brown and others, 1970; Fishman and Friedman, 1989).

QUALITY OF WATER

The analyses for 18 wells completed in the Red River alluvial aquifer are presented in table 1 (at back of this report). Water-quality changes were evaluated for 17 of the 18 wells. Well R-733 was not evaluated because of insufficient data. Changes in total hardness and concentrations of dissolved chloride, iron, and manganese for these 18 wells are shown in graphs (figs. 2-19).

Data are missing for some wells because the screens were incrusted or the water levels in the wells were below the screen setting. Also, concentrations of dissolved iron and manganese are not shown when the sample was collected by pumping with air because aeration alters these constituents.

Median values of total hardness and median concentrations of dissolved chloride, iron, and manganese were calculated using data from pre-construction (1974-78) and post-construction (1984- 92) sampling periods for 18 wells shown in figure 1. Given relatively small data sets, particularly during the post-construction sampling period, a median value gives a more representative time- averaged value than would a mean value, by minimizing the effect of outlying data points. A minimum of six data points were required to justify calculation of a median value. Data sets containing less than six points were insufficient for statistical analysis.

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Red

R

iver

a

lluvi

al

aquife

r,

from

pre

-const

ruct

ion

(1974-7

8)

to

post

- co

nst

ruct

ion

(19

84

-92

) o

f Lo

ck

and

Dam

1

on

the

Red

R

iver

, L

ou

isia

na

.

OT


r~o X o o CDI-I "oi'c -P

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O

400

200

| P

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ruct

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| C

on

stru

ctio

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| P

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ruct

ion

150

50

0.5

\ I

TI

I I

i

Tot

al h

ard

ness

as

CaC

O3

Dis

solv

ed c

hlo

ride

Dis

solv

ed i

ron

i i

i

Dis

solv

ed

ma

ng

an

ese

1974

19

76

1

97

8

19

80

1

98

2

1984

19

86

1

98

8

1990

19

92

Fig

ure

12

. T

otal

h

ard

ne

ss

an

d

conce

ntr

atio

ns

of

dis

solv

ed

chlo

rid

e,

iron,

an

d m

anganese

in

w

ate

r fr

om

we

ll C

t-74

co

mp

lete

d

in

the

Red

R

iver

allu

via

l a

qu

ifer,

fr

om

pre

-const

ruct

ion

(1974-7

8)

to

po

st-

const

ruct

ion

(1984-9

2)

of

Lock

an

d D

am

1 on

th

e R

ed

Riv

er,

Lo

uis

ian

a.

Ld

O

| P

re-c

on

stru

ctio

n |

C

onst

ruct

ion

| P

ost

-const

ruct

ion

380

36

0

340

320

30

0 35

L"-1

Q_

30 25

20

IS

5

.5

UJ

O ^

< *

O

1.2

O

0.8

0.6

Tot

al h

ard

ness

as

CaC

O3

i i

i i

i

Dis

solv

ed c

hlo

rid

e

i i

i i

i i

Dis

solv

ed

ma

ng

an

ese

1974

1976

1978

19

80

1982

1984

1986

1988

19

90

1992

Fig

ure

13

. T

otal

h

ard

ne

ss

an

d

con

cen

tra

tion

s of

d

isso

lve

d

chlo

rid

e,

iron,

an

d m

an

ga

ne

se

in

wate

r fr

om

well

Ct-

75

com

ple

ted

in

th

e R

ed

Riv

er

allu

vial

aquife

r,

from

p

re-c

on

stru

ctio

n

(1974-7

8)

to

post

- co

nst

ruct

ion

(1984-9

2)

of

Lock

an

d D

am

1 on

th

e R

ed

Riv

er,

Louis

iana.


g§al? 5

.CD =r so w cu

J3 0)

o =r. cu o o CD r> ?r 3 -< Q.

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§6-2

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o ro ^£ a

1 ro

o

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13 O


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to cu

O O CD 3 <0^ 3 " a on

ts>

CL cp 3 D

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o 3-5-O CD Xa a 1 CD

_j

o:

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to o:

o o 5 LU

o

z

o

o

I P

re-c

onst

ruct

ion

| C

on

stru

ctio

n

| P

ost

-co

nst

ruct

ion

700

500 so 3

1.5

0.5

Tot

al h

ard

ne

ss a

s C

aCO

,

I I

TT

I

I I

I I

I

Dis

solv

ed c

hlo

ride

Dis

solv

ed i

ron

Dis

solv

ed

manganese

19

7*

1976

1978

19

80

1

98

2

1984

1986

1988

1990

19

92

Fig

ure

16

. T

otal

ha

rdne

ss

and

con

cen

tra

tion

s o

f d

isso

lve

d

chlo

ride,

iron,

an

d m

anga

nese

in

w

ate

r fr

om

wel

l R

-73

3

com

ple

ted

in

the

Red

R

iver

allu

vial

aqui

fer,

fr

om

pre

-co

nst

ruct

ion

(1

974-

78)

to

po

st-

con

stru

ctio

n

(19

84

-92

) of

Lo

ck

and

Dam

1

on

the

Red

R

iver

, L

ou

isia

na

.

| P

re-c

on

stru

ctio

n

| C

onst

ruct

ion

| P

ost

-const

ruct

ion

o:

Ld o_ CO o:

o

BOO

60

01

50

125

100 8

o CJ

O

0.6

CJ

0.4

0.2

Tot

al h

ard

ne

ss a

s C

aCO

1 I

T I

Dis

solv

ed

ch

lorid

e

Dis

solv

ed m

anganese

1974

19

76

1978

1980

19

82

1984

19

86

1988

1990

1992

Fig

ure

17

. T

otal

ha

rdne

ss

and

con

cen

tra

tion

s o

f d

isso

lve

d

chlo

ride,

iron,

an

d m

anga

nese

in

w

ate

r fr

om

well

R-7

44

com

ple

ted

in

th

e R

ed

Riv

er

allu

vial

aqui

fer,

fr

om

pre

-co

nst

ruct

ion

(1

97

4-7

8)

to

post

- co

nst

ruct

ion

(1

984-

92)

of

Lock

a

nd

D

am

1 on

th

e R

ed

Riv

er,

Louis

iana.


£U "»J

8*§ ^ CD ^.

3 c/>

TJCD

Oo

-a o


5"8?3| i-aa-3S

II C 3 OwSCD (U

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-o3^00 Q. ( 3 3

3 ~

^ 3 roo

s.

\

Table 2 lists well numbers, median values and concentrations, a range of values around the median value corresponding to the indicated confidence level, and the number of data points contained in the data sets for total hardness and dissolved chloride, iron, and manganese during pre- construction and post-construction sampling periods for most wells shown in figure 1. Because of insufficient data points, table 2 does not include wells Av-331, Av-339, R-733, and R-744. The target confidence level for calculated ranges around the median value in table 2 was 95 percent. Variability in the confidence level is inherent in the use of median rather than mean values. The technique used in calculating ranges around median values and in establishing the exact corresponding confidence levels listed in table 3 is discussed in greater detail by Iman and Conover (1983, p. 198-202).

The procedure used to establish documentable changes (an increase or decrease as shown in table 3) between pre-construction and post-construction sampling periods uses the calculated range of values around the median value shown in table 2. If the calculated ranges around the median values of pre-construction and post-construction sampling periods overlap, then no documentable difference exists between pre-construction and post-construction sampling periods. If the calculated ranges around the median values of pre-construction and post-construction sampling periods do not overlap and the median value of the post-construction sampling period is greater than the median value of the pre-construction sampling period then an increase (+ value in table 3) has occurred. If the calculated ranges around the median values of pre-construction and post-construction sampling periods do not overlap and the median value of the post-construction sampling period is less than the median value of the pre-construction sampling period then a decrease (- value in table 3) has occurred. In instances where a change has occurred between pre-construction and post-construction sampling periods, the magnitude of the change can be approximated by subtracting the pre-construction sampling period median value from the post-construction sampling period median value. This approach to statistical analysis of data is not applicable to data sets that show temporal trends. Data sets showing change between pre-construction and post-construction sampling periods and showing temporal trends in either pre-construction or post-construction sampling periods will be discussed on an individual basis.

The results of statistical analysis of total hardness and dissolved chloride, iron, and manganese data collected during pre-construction and post-construction sampling periods for wells shown in figure 1 are summarized in table 3. Table 3 lists 8 increases between pre-construction and post- construction sampling periods, 15 decreases between pre-construction and post-construction sampling periods, 27 instances of no documentable difference between pre-construction and post- construction sampling periods, and 18 instances of insufficient data on which to base a decision.

Total Hardness

Analyses of water from wells Av-381 (fig. 10) and Ct-74 (fig. 12) indicated increases and water from wells Av-153 (fig. 2), Av-370 (fig. 7), Av-371 (fig. 8), Av-372A (fig. 9), Av-382 (fig. 11), and Ct-81 (fig. 14) indicated decreases in the median hardness between pre-construction and post- construction sampling periods (table 3). Wells containing water that indicated a change and a no detectable difference in median hardness between pre-construction and post-construction sampling periods are shown in figure 20.

Analysis of water from well Ct-74 indicated an increasing temporal trend in hardness during the pre-construction and post-construction sampling periods. The trend began about 1976, continued into 1987, and became essentially constant through 1992. Wells Av-370 and Av-372A indicated a decreasing temporal trend in hardness during pre-construction and post-construction sampling periods. The trend began in about 1976 for well Av-372A and continued into 1992. The trend for

15

Tabl

e 2.

S

tatis

tical

ana

lysi

s of

tota

l ha

rdne

ss a

nd c

once

ntra

tions

of d

isso

lved

chl

orid

e, ir

on,

and

man

gane

se in

wat

er fr

om s

elec

ted

wel

ls c

ompl

eted

in t

he R

ed

Riv

er a

lluvi

al a

quife

r, du

ring

pre-

cons

truct

ion

(197

4-78

) an

d po

st-c

onst

ruct

ion

(198

4-92

) pe

riods

of L

ock

and

Dam

1 o

n th

e R

ed R

iver

, Lo

uisi

ana

[mg/

L, m

illig

ram

s pe

r lit

er, N

, num

ber

of p

oint

s in

dat

a se

t; ,

no

data

ava

ilabl

e]

O\

Pre-

cons

truc

tion

Wel

l no

.M

edia

n va

lue

(mg/

L)M

edia

n ra

nge

(mg/

L)C

onfi

denc

e le

vel (

95 p

erce

nt)

NM

edia

n va

lue

(mg/

L)

Post

-con

stru

ctio

n

Med

ian

Con

fide

nce

rang

e (m

g/L)

le

vel (

95 p

erce

nt)

N

Tot

al h

ardn

ess

as c

alci

um c

arbo

nate

Av-

153

Av-

334

Av-

364

Av-

370

Av-

371

Av-

372A

Av-

381

Av-

382

Ct-

74

Ct-

75

Ct-

81

Ct-

96

R-9

63

R-1

102

815

410

920

730

400

730

200

450 98 335

350

980

585

755

780-

840

400^

30

880-

930

660-

760

340-

420

710-

750

190-

220

400^

90

93-1

10

330-

340

350-

360

940-

1,00

0

490-

600

740-

850

96.9

2

94.6

0

98.4

4

98.0

8

95.8

6

98.0

8

92.9

6

96.8

8

95.1

0

94.2

6

96.4

8

96.1

0

97.8

6

96.8

8

18 22 7 19 20 19 8 6 17 14 15 9 10 6

665

450 -

330

300

380

260

320

280

335

310

1,10

0

510

730

630-

700

400-

460

-

300-

370

280-

320

260^

10

230-

320

300-

350

240-

300

320-

350

290-

320

870-

1,20

0

470-

580

670-

760

92.9

6

92.9

6

- 98.8

2

98.4

4

98.8

2

96.1

0

96.1

0

98.8

2

92.9

6

97.8

6

98.4

4

97.8

6

96.8

8

8 8 1 11 7 11 9 9 11 8 10 7 10 6

Tabl

e 2.

S

tatis

tical

ana

lysi

s of

tot

al h

ardn

ess

and

conc

entr

atio

ns o

f di

ssol

ved

chlo

ride,

iro

n, a

nd m

anga

nese

in w

ater

from

sel

ecte

d w

ells

com

plet

ed i

n th

e R

ed

Riv

er a

lluvi

al a

quife

r, du

ring

pre-

cons

truc

tion

(197

4-78

) an

d po

st-c

onst

ruct

ion

(198

4-92

) pe

riods

of

Lock

and

Dam

1 o

n th

e R

ed R

iver

, Lo

uisi

ana-

Con

tinue

d

Pre

-con

stru

ctio

n

Wel

l no

.

Av-

153

Av-

334

Av-

364

Av-

370

Av-

371

Av-

372A

Av-

381

Av-

382

Ct-

74

Ct-

75

Ct-8

1

Ct-

96

R-9

63

R-1

102

Med

ian

valu

e (m

g/L)

13 45.5

20 18 77.5

44 62.5 3.3

45 28 36 180 11

.5

140

Med

ian

rang

e (m

g/L)

12-1

4

43-4

7

14-3

4

16-2

0

61-1

10

41-4

5

55-6

6

1.8-

4.2

44-4

6

26-2

9

35-3

8

170-

190

5.0-

16

140-

160

Con

fide

nce

leve

l (9

5 pe

rcen

t)

96.9

2

93.5

0

98.4

4

98.0

8

95.8

6

98.0

8

92.9

6

96.8

8

95.1

0

94.2

6

96.4

8

96.1

0

97.8

6

96.8

8

N

Dis

solv

ed c

hlor

ide

18 24 7 19 20 19 8 6 17 14 15 9 10 6

Med

ian

valu

e (m

g/L)

13 79 - 4.8

46 30 58 4.5

130 27.5

19 180 3.

3

125

Pos

t-co

nstr

ucti

on

Med

ian

rang

e (m

g/L)

11-1

4

76-8

4

-

2.8-

10

43-4

8

22-6

0

49-6

2

4.0-

5.5

77-1

30

26-2

8

19-2

4

150-

220

2.0-

5.4

120-

140

Con

fide

nce

leve

l (9

5 pe

rcen

t)

92.9

6

92.9

6

- 98.8

2

98.4

4

98.8

2

96.1

0

96.1

0

98.8

2

92.9

6

97.8

6

98.4

4

97.8

6

96.8

8

N

8 8 1 11 7 11 9 9 11 8 10 7 10 6

Tabl

e 2.

S

tatis

tical

ana

lysi

s of

tota

l har

dnes

s an

d co

ncen

tratio

ns o

f dis

solv

ed c

hlor

ide,

iron

, an

d m

anga

nese

in w

ater

from

sel

ecte

d w

ells

com

plet

ed in

the

Red

R

iver

allu

vial

aqu

ifer,

durin

g pr

e-co

nstru

ctio

n (1

974-

78)

and

post

-con

stru

ctio

n (1

984-

92)

perio

ds o

f Loc

k an

d D

am 1

on

the

Red

Riv

er, L

ouis

iana

-Con

tinue

d

Pre

-con

stru

ctio

n

Wel

l no

.

Av-

153

Av-

334

Av-

364

Av-

370

Av-

371

Av-

372A

Av-

381

Av-

382

Ct-

74

Ct-

75

Ct-8

1

Ct-

96

R-7

44

R-9

63

R-1

102

Med

ian

valu

e (m

g/L)

18 15 -- 18 16 13 2.2

--

.33

5.25

7.5

8.2

-- 2.0

_

Med

ian

rang

e (m

g/L)

18-2

0

14-1

6

--

15-1

8

15-1

7

12-1

3

1.9-

2.3

-

.30-

.44

5.1-

5.3

6.8-

7.6

7.7-

8.5

~

1.6-

2.8

_

Con

fide

nce

leve

l (95

per

cent

)

97.8

8

97.1

0

- 96.4

8

97.8

8

96.4

8

98.4

4

- 96.4

8

94.2

6

97.7

6

98.4

4

- 96.1

0

_

N Dis

solv

ed ir

on

16 21 5 15 16 15 7 5 15 14 13 7 5 9 5

Med

ian

valu

e (m

g/L)

15.5

20 - 6.9

15 7.1

2.7

1.2

1.4

5.15

7.5

6.1

- 1.8

6.85

Pos

t-co

nstr

ucti

on

Med

ian

rang

e (m

g/L)

14-1

6

19-2

1

-

6.7-

8.0

11-1

6

4.5-

7.8

2.6-

3.6

.92-

2.7

1.2-

1.5

5.1-

5.2

7.1-

7.8

5.5-

15 -

1.7-

2.2

6.1-

7.2

Con

fide

nce

leve

l (95

per

cent

)

92.9

6

92.9

6

- 98.8

2

96.8

8

98.8

2

96.1

0

96.1

0

98.8

2

92.9

6

97.8

6

98.4

4

- 96.1

0

96.8

8

N

8 8 0 11 6 11 9 9 11 8 10 7 5 9 6

Tabl

e 2.

S

tatis

tical

ana

lysi

s of

tota

l har

dnes

s an

d co

ncen

tratio

ns o

f dis

solv

ed c

hlor

ide,

iro

n, a

nd m

anga

nese

in w

ater

from

sel

ecte

d w

ells

com

plet

ed in

the

Red

R

iver

allu

vial

aqu

ifer,

durin

g pr

e-co

nstru

ctio

n (1

974-

78)

and

post

-con

stru

ctio

n (1

984-

92)

perio

ds o

f Loc

k an

d D

am 1

on

the

Red

Riv

er,

Loui

sian

a-C

ontin

ued

Pre-

cons

truc

tion

Wel

l M

edia

n no

. va

lue

(mg/

L)M

edia

n ra

nge

(mg/

L)C

onfi

denc

e le

vel (

95 p

erce

nt)

NM

edia

n va

lue

(mg/

L)

Post

-con

stru

ctio

n

Med

ian

Con

fide

nce

rang

e (m

g/L)

le

vel

(95

perc

ent)

N

Dis

solv

ed m

anga

nese

Av-

153

Av-

334

Av-

364

Av-

370

Av-

371

Av-

372A

Av-

381

Av-

382

Ct-

74

Ct-

75

Ct-8

1

Ct-

96

R-9

63

R-1

102

1.9 .4

65

-- 1.4

1.1 .6

15

.14

.255

.12

.745

.60

2.7

1.6 .2

05

1.8-

2.1

.4S-

.48

--

1.4-

1.5

.94-

1.4

.60-

.67

.08-

. 18

.14-

.38

.10-

.17

.70-

.78

.58-

.6S

2.6-

3.0

1.4-

1.6

.20-

.23

96.4

8

96.9

2

-- 96.4

8

95.1

0

94.2

6

98.4

4

96.8

8

97.8

8

94.2

6

96.4

8

92.9

6

92.9

6

96.8

8

15 18 5 15 17 14 7 6 16 14 15 8 8 6

1.55 .55

--

.56

.815

.39

.16

.24

.36

.67

.59

2.8

1.65 .3

4

1.3-

2.0

.48-

.60

--

.42-

.81

.59-

1.0

.25-

.S2

.13-

.23

.16-

.30

.27-

.4S

.56-

1.10

.S2-

.84

2.1-

3.7

1.6-

2.1

.18-

.52

92.9

6

92.9

6

-- 98.8

2

96.8

8

98.8

2

96.1

0

96.1

0

98.8

2

98.4

4

97.8

6

98.4

4

97.8

6

96.8

8

8 8 1 11 6 11 9 9 11 7 10 7 10 6

Tabl

e 3.

S

umm

ary

of c

hang

es in

med

ian

valu

es o

f tot

al h

ardn

ess

and

med

ian

conc

entra

tions

of d

isso

lved

chl

orid

e, ir

on,

and

man

gane

se in

wat

er fr

om s

elec

ted

wel

ls c

ompl

eted

in th

e R

ed R

iver

allu

vial

aqu

ifer f

rom

pre

-con

stru

ctio

n (1

974-

78)

to p

ost-c

onst

ruct

ion

(198

4-92

) pe

riods

of

Lock

and

Dam

1 o

n th

e R

ed R

iver

,Lo

uisi

ana

[Con

cent

ratio

ns a

re in

mill

igra

ms

per

liter

, N, n

o; Y

, yes

; I,

insu

ffic

ient

dat

a; ,

no v

alue

cal

cula

ted;

*, n

o do

cum

enta

ble

diff

eren

ce]

Tota

l har

dnes

s as

ca

lciu

m c

arbo

nate

Wel

l no

.

Av-

153

Av-

331

Av-

334

Av-

339

Av-

364

Av-

370

Av-

371

Av-

372A

Av-

381

Av-

382

Ct-

74

Ct-

75

Ct-8

1

Ct-

96

R-7

33

R-7

44

R-9

63

R-1

102

Doc

umen

tabl

e di

ffere

nce

Y I N I I Y Y Y Y Y Y N Y N I I N N

Pos

t-

const

ruct

ion

med

ian

conc

entr

atio

n le

ss p

re-

const

ruct

ion

med

ian

-150 - * - -

^00

-100

-350

+60

-130

+182

*

^0 * - - * *

Dis

solv

ed c

hlo

ride

Doc

umen

tabl

e di

ffere

nce

N I Y I I Y Y Y N N Y N Y N I I N N

Pos

t co

nstr

uctio

n m

edia

n co

ncen

trat

ion

less

pre

- co

nstr

uctio

n m

edia

n

* --

+33.

5

- -

-13.

2

-31.

5

-14 * *

+85 *

-17 * - - * *

Dis

solv

ed i

ron

Doc

umen

tabl

e di

ffere

nce

Y I Y I I Y N Y Y I Y N N N I I N I

Pos

t co

nst

ruct

ion

med

ian

conc

entr

atio

n le

ss p

re-

const

ruct

ion

med

ian

-2.5

- +5 - -

-11.

1

* -5.9 +.5

- +1.0

7

* * * - - * -

Dis

solv

ed m

anga

nese

Doc

umen

tabl

e di

ffere

nce

N I N I I Y N Y N N Y N N N I I N N

Pos

t co

nst

ruct

ion

med

ian

conc

entr

atio

n le

ss p

re-

con

stru

ctio

n

med

ian

* -- * -- -- -0.8

4

* -.225

* * +.24

* * * -- - * *

92" 15' 92 00'

31 U 15' -

T. 4 N.

T. 3 N.

T. 2 N.

T. 1 N.

R. 2 E. R. 3 E. R. 4 E. R. 5 E. R. 6 E.

Ct-74 + 182

Ct-75 O

EXPLANATION

OBSERVATION WELL SHOWING CHANGE IN TOTAL HARDNESS-Top number is well number. Bottom number is change in median, in milligrams per liter (+, increase; -, decrease)

OBSERVATION WELL AND WELL NUMBER-- No change in median from pre-construction to post-construction

STUDY AREA

INDEX MAP

Figure 20. Changes in median values of total hardness of water from wells completed in the Red River alluvial aquifer, from pre-construction (1974-78) to post-construction (1984-92) of Lock and Dam 1 on the Red River, Louisiana.

21

well Av-370 continued into 1991, but in 1992 the hardness had increased to almost the pre- construction level. Well Av-382 indicated a decreasing temporal trend in hardness during the pre- construction sampling period; the trend began in about 1976 and continued into 1978. The presence of temporal trends in pre-construction and post-construction sampling periods for hardness indicates that hydrologic factors other than the construction of Lock and Dam 1 have affected hardness in wells Ct-74, Av-372A, and Av-382.

Excluding wells Ct-74, Av-372A, and Av-382, data for four wells south of Lock and Dam 1 indicated decreases in hardness between pre-construction and post-construction sampling periods. Data for well Av-381, located about 10 mi west and about 2.5 mi south of Lock and Dam 1, indicated an increase in hardness between pre-construction and post-construction periods.

Dissolved Chloride

Analyses of water from wells Av-334 (fig. 4) and Ct-74 (fig. 12) indicated increases and water from wells Av-370 (fig. 7), Av-371 (fig. 8), Av-372A (fig. 9), and Ct-81 (fig. 14) indicated decreases in the median concentration of dissolved chloride between pre-construction and post-construction sampling periods. Wells containing water that indicated a change and a no detectable difference in the median concentration of dissolved chloride between pre-construction and post-construction sampling periods are shown in figure 21.

Analysis of water from well Av-372A indicated a decreasing temporal trend in the concentration of dissolved chloride during the pre-construction and post-construction sampling periods. The trend began about 1976 and continued into 1987, but indicated an increasing trend from 1989 to 1992. The presence of a temporal trend during pre-construction and post-construction sampling periods for chloride indicates that hydrologic factors other than the construction of Lock and Dam 1 have affected the concentration of dissolved chloride in well Av-372A.

Only wells within about 2 mi of Lock and Dam 1 indicated changes in the concentration of dissolved chloride between pre-construction and post-construction sampling periods. One well to the north of Lock and Dam 1 indicated an increase in the concentration of dissolved chloride between pre-construction and post-construction sampling periods. Excluding well Av-372A, three wells south of Lock and Dam 1 indicated decreases and one well south of Lock and Dam 1 indicated an increase in the concentration of dissolved chloride between pre-construction and post-construction sampling periods. Some of the increases in dissolved chloride concentrations probably are due to upconing of saltwater from underlying sands of Tertiary age caused by the water level in the alluvial aquifer being lowered about 40 ft (table 1) due to dewatering of wells during the construction of Lock and Dam 1.

Dissolved Iron

Median concentrations of dissolved iron in water from wells Av-334 (fig. 4), Av-381 (fig. 10), and Ct-74 (fig. 12) indicated increases and wells Av-153 (fig. 2) and Av-372A (fig. 9) indicated decreases between analyses for pre-construction and post-construction sampling periods. Wells containing water that indicated a change and a no detectable difference in the median concentration of dissolved iron between pre-construction and post-construction sampling periods are shown in figure 22.

22

92° 15' 92 00'

31 U 15' -

T. 4 N.

T. 3 N.

T. 2 N.

T. 1 N.

R. 2 E. R. 3 E. R. 4 E. R. 5 E. R. 6 E.

EXPLANATION

Ct-74+85 OBSERVATION WELL SHOWING CHANGE IN DISSOLVED CHLORIDE-Top number is well

number. Bottom number is change in median, in milligrams per liter (+. increase; -, decrease)

Ct-75 O

OBSERVATION WELL AND WELL NUMBER- No change in median from pre-construction to post-construction

STUDY AREA

INDEX MAP

Figure 21. Changes in median concentration of dissolved chloride in water from wells completed in the Red River alluvial aquifer, from pre-construction (1974-78) to post-construction (1984-92) of Lock and Dam 1 on the Red River, Louisiana.

23

92 U 15' 92 00'

C£]D / '---4------

1..... Vtefr

T. 4 N.

T. 3 N.

T 2 N.

6 MILES

T. 1 N.

R. 2 E. R. 3 E. R. 4 E. R. 5 E. R. 6 E.

Ct-74

Ct-75 O

EXPLANATION

OBSERVATION WELL SHOWING CHANGE IN DISSOLVED IRON-Top number is well number. Bottom number is change in median, in milligrams per liter (+, increase; -, decrease)


STUDY AREA

INDEX MAP

Figure 22. Changes in median concentration of dissolved iron in water from wells completed in the Red River alluvial aquifer, from pre-construction (1974-78) to post-construction (1984-92) of Lock and Dam 1 on the Red River, Louisiana.

24

Water analyses for well Av-370 (fig. 7) indicated a decrease in the concentration of dissolved iron between pre-construction and post-construction. However, the iron concentration increased, from a low in 1989, to a level in 1992 comparable with the pre-construction level. Data for well Av- 381 indicated considerable variation in the concentration of dissolved iron during the post- construction sampling period. While there is an apparent increase in the post-construction concentrations of dissolved iron from the pre-construction concentrations of dissolved iron, particularly in samples collected in 1988 and 1990, the differences in median concentrations between pre-construction and post-construction sampling periods should be interpreted with caution. Data for well Ct-74 indicated an increasing temporal trend in the concentration of dissolved iron during the pre-construction and post-construction sampling periods, which began about 1977, continued into 1989, and became essentially constant through 1992. The presence of a temporal trend in pre- construction and post-construction sampling periods for iron indicates that hydrologic factors other than the construction of Lock and Dam 1 have affected the concentration of dissolved iron in well Ct- 74.

Excluding well Ct-74, data for three wells within approximately 1 mi south of Lock and Dam 1 indicated decreases, and data for one well about 3 mi south of Lock and Dam 1 indicated an increase in the concentration of dissolved iron between pre-construction and post-construction sampling periods. Data for one additional well about 10 mi west and about 2.5 mi south of Lock and Dam 1 indicated an increase in the concentration of dissolved iron between pre-construction and post- construction periods.

Dissolved Manganese

Median concentrations of dissolved manganese in water from well Ct-74 (fig. 12) indicated an increase and wells Av-370 (fig. 7), and Av-372A (fig. 9) indicated a decrease between pre- construction and post-construction sampling periods. Wells containing water that indicated a change in the median concentration of dissolved manganese between pre-construction and post-construction sampling periods are shown in figure 23.

Data for well Ct-74 indicated an increasing temporal trend in the concentration of dissolved manganese during pre-construction and post-construction sampling periods beginning in about 1975 and continuing at least into about 1988, followed by a usually constant concentration through 1992. The presence of a temporal trend in pre-construction and post-construction sampling periods indicates that hydrologic factors other than the construction of Lock and Darn 1 have affected the concentration of dissolved manganese in well Ct-74.

Only wells within approximately 1 mi of Lock and Dam 1 indicated changes in the concentration of dissolved manganese between pre-construction and post-construction sampling periods. Excluding well Ct-74, data for two wells to the south of Lock and Dam 1 indicated decreases in the concentration of dissolved manganese between pre-construction and post-construction sampling periods.

25

92°15' 92 OO 1

T. 4 N.

T. 3 N.

T. 2 N.

T. 1 N.

R. 2 E. R. 3 E. R. 4 E. R. 5 E. R. 6 E.

Ct-74 7024

Ct-75 O

EXPLANATION

OBSERVATION WELL SHOWING CHANGE IN DISSOLVED MANGANESE-Top number is well number. Bottom number is change in median, in milligrams per liter (+, increase; -, decrease)


STUDY AREA

INDEX MAP

Figure 23. Changes in median cpncentration of dissolved manganese in water from wells completed in the Red River alluvial aquifer, from pre-construction (1974-78) to post-construction (1984-92) of Lock and Dam 1 on the Red River, Louisiana.

26

SUMMARY AND CONCLUSIONS

The quality of water in the Red River alluvial aquifer was monitored during pre-construction (1974-78), construction (1980-83), and post-construction (1984-92) of Lock and Dam 1, to document background conditions and establish a data base for future evaluation of the effects of construction and operation of the structures on the aquifer. Fifteen wells completed in the Red River alluvial aquifer within the study area have been sampled periodically from 1974 to 1990; five of these wells also were sampled in 1991 and 1992. Intermittent samples were collected from three other wells completed in the Red River alluvial aquifer in the study area. Total hardness as calcium carbonate and dissolved chloride, iron, and manganese concentrations, calculated from data collected during these sampling periods, were used to determine changes in quality of water in the aquifer, between pre-construction and post-construction of Lock and Dam 1.

Changes in median values and concentrations that were unaffected by temporal trends in total hardness and concentrations of dissolved chloride, iron, and manganese between the pre-construction and post-construction sampling periods were confined to within approximately 2 miles of Lock and Dam 1, except for increases in total hardness and dissolved iron concentration in well Av-381. Generally, total hardness and concentrations of dissolved chloride, iron, and manganese in the alluvial aquifer south of Lock and Dam 1 decreased between the pre-construction and post- construction sampling periods when changes, unaffected by temporal trends, occurred. Exceptions to this generalization were increases in the concentrations of dissolved chloride and iron in well Av-334 between the pre-construction and post-construction sampling periods. Change, unaffected by temporal trends, north of Lock and Dam 1 was limited to an increase in the concentration of dissolved chloride in well Ct-74 between the pre-construction and post-construction sampling periods. Because well Ct-74 is completed in a sand that is in contact with a saltwater sand of Tertiary age, this increase is probably a temporal increase due to upconing after lowering the water level in the alluvial aquifer by pumping of dewatering wells during construction of Lock and Dam 1.

The temporal trends during the pre-construction and post-construction sampling periods for total hardness and dissolved chloride and iron indicate that hydrologic factors other than the construction of Lock and Dam 1 have affected the quality of water in some of the wells completed in the Red River alluvial aquifer.

SELECTED REFERENCES

American Public Health Association, American Water Works Association, and Water PollutionControl Federation, 1980, Standard methods for the examination of water and wastewater (15thed.): New York, American Public Health Association, Inc., 1134 p.

Brown, Eugene, Skougstad, M.W., and Fishman, M.J., 1970, Methods for collection and analysis ofwater samples for dissolved minerals and gases: U.S. Geological Survey Techniques forWater-Resources Investigations, book 5, chap. Al, 160 p.

Fishman, M.J., and Friedman, L.C., eds., 1989, Methods for determination of inorganic substances inwater and fluvial sediments: U.S. Geological Survey Techniques of Water-ResourcesInvestigations Report, book 5, chap. Al, 545 p.

Iman, R.L., and Conover, W.J., 1983, A Modern Approach to Statistics: New York, John Wiley andSons, 497 p.

Ludwig, A.H., 1974, Quality of water in the Red River alluvial aquifer, Shreveport to the mouth ofthe Black River, Louisiana: U.S. Geological Survey Open-File Report, 7 p.

27

Rogers, J.E., 1988, Red River Waterway Project Summary of ground-water studies by the U.S.Geological Survey, 1962-85: U.S. Geological Survey Water-Resources Investigations Report87-4261, 19 p.

Smoot, C.W., 1983, Records of water-level measurements and lithologic logs, Red River Valley,Louisiana, 1975-80: Louisiana Department of Transportation and Development, Office ofPublic Works Water Resources Basic Records Report no. 12, 197 p.

Smoot, C.W., and Guillot, J.R., 1988, Water-level measurements 1981-85 and chemical analyses1978-85, Red River alluvial aquifer, Red River Valley, Louisiana: U.S. Geological SurveyOpen-File Report 87-541, 261 p.

Smoot, C.W., and Martin, Angel, Jr., 1991, Generalized potentiometric surfaces of the Red Riveralluvial aquifer, pool 1, Red River waterway area, central Louisiana: U.S. Geological SurveyWater-Resources Investigations Report 91-4109, 7 map sheets.

Whitfield, M.S., Jr., 1980, Chemical character of water in the Red River alluvial aquifer, Louisiana:U.S. Geological Survey Water-Resources Investigations Open-File Report 80-1018, 95 p.

Wood, W.W., 1976, Guidelines for collection and field analysis of ground-water samples for selectedunstable constituents: U.S. Geological Survey Techniques of Water-Resources Investigations,book l,chap. D2, 24 p.

28

TABLE 1

29

Table 1. Summary of chemical and physical analyses of water from wells completed in the Red River alluvial aquifer,Louisiana, 1965-92

[ft, feet; (iS/cm, microsiemens per centimeter at 25 degrees Celsius; °C, degrees Celsius; mg/L, milligrams per liter, +, water level above land surface; <, actual value is known to be less than value shown; dashes indicate no data]

Well no.

Date

AV-153 03-15-6503-23-7405-14-7408-23-7409-24-74

10-21-7411-18-7412-16-7401-17-7502-11-75

03-05-7504-26-7506-03-7507-24-7503-22-76

05-27-7612-09-7603-29-7703-27-7805-10-79

04-16-8004-18-8303-21-8410-24-8403-14-85

10-08-8504-01-8608-29-8603-26-8704-19-89

AV-331 04-21-7004-08-7407-22-7510-22-7609-19-88

04-18-8904-12-90

AV-334 10-18-7211-28-7212-19-7202-20-7306-19-73

08-15-7312-03-73

02-15-7403-23-7407-02-74

Water level below land sur face (ft)

7.16.

19.13.9.7.5.

4.+ 3.3.

17.14.

20.

28.19.20.21.

31.29.18.24.11.

26.18.23.8.

11.

_---

7.

3.

1.

_----

_-

-

5.5.

._ 2909

6237260616

6062703252

3499757497

8989801174

3057

442665

_---

43

77

93

_----

_-

-

4545

Depth of

well, total

(ft)

5959595959

5959595959

5959595959

59

59595959

5959595959

59

59595959

4242424242

42

42

9090909090

9090

909090

Spe

cific con duct ance (flS/cm)

._

1,4901,1,1,

1,1,1,1,1,

1,1,1,1,

-

_----

_--

1,1,

2,1,1,-

1,

1,1,1,

_

1,1,

240500500

440530460460470

470430490500-

._

----

._----

-

--

300370

100540430-

807

780777

010975000030100

_

989982010000

pH, field (stand ard

units)

_.

6.7.6.6.

6.7.6.6.6.

6.6.6.6.6.

7.--

7.6.6.

--

6.6.6.

7.

6.6.6.6.

6.5.

6.6.

6.

6.

7.

6.6.

.3

.2

,4.7

,9,0,3,7,6

54729

0

079

898

0

8998

37

53

6

5

2

54

Hard-

Color ness, Temper- (plat- total ature of inum- (mg/L water cobalt as (°C) units) CaC03 )

__

8405 610

9805 870

790770

20.5 85021.0 840

800

20.5 80021.0 5 850

0 750800830

840780

0 830750850

640440610660630

670700

23.5 65020.0 77020.5 10 700

1 79020.5 44020.0 0 530

86020.0 0 270

20.5 5 22020.0 0 220

440410400380

20.0 390

44020.5 410

380440510

Hard

ness, noncarb whole

water Calcium, total dis-

field solved (mg/L as (mg/L

CaC03 ) as Ca)

__

0 160

10 240

__

__

0 230200

0 230

__

150

160

170

170160200170

690 250

380 120

0 60

46

47

1101001009096

_ __

__

Magne

sium, Sodium, dis- dis

solved solved (mg/L (mg/L

as Mg) as Na)

51 31

65 17

_ _

_ __

67 2760 28

_ __

61 28

_ __

566157

60

68606866 27

41 160

55 120

30 100

26 93

25 95

3938373737

_ _

Potas

sium, dis

solved (mg/L

as K)

5.1

5.7

_

_

4.44.4

_

5.4

_

_

4.5

1.1

.8

.9

.8

1.1

_

_

30

Table 1. Summary of chemical and physical analyses of water from wells completed in the Red River alluvial aquifer,Louisiana, 1965-92~continued

Alkalinity, ascalcium

carbonate,field(rag/L asCaC03 )

660

850

_

860800

_

890

_

750786

120

130

293

314290

_

Sulfate,dis

solved(rag/L

as S04 )

__

8.69.4

168.0

113.08.06.26.2

4.48.05.8

393.6

8.0106.83.8

22

161018139.8

1610119.0

11

580430410690120

99100

--

__

8.4134.4.8

Chloride,dis

solved(mg/Las Cl)

3013131512

1421141314

1312131312

1414109.4

15

1318141314

1812111113

280140140300

7.5

6.8

5.8

4446

4344

36

3484464742

Solids, Solids, Nitro- Nitro- Nitro- Nitro-Fluo- Silica, residue sura of gen, Nitro- gen, gen, gen,ride, dis- at constit- nitrite gen, nitrite nitrate N02+N03 Iron,dissolved 100 °C, uents, dis- nitrate dis- dis- dis- dissolved (r.g/L dis- dis- solved total solved solved solved solved(rag/L as solved solved (mg/L (rag/L (rag/L (rag/L (rag/L (rag/Las F) Si02 ) (rag/L) (rag/L) as N) as N03 ) as N02 ) as N) as N) as Fe)

__

5.8<0.1 38 740 720 -- 1.2 17

7.91.0 36 913 .04 20

1922192018

19.4 41 929 0.59 1.9 0.01 0.6 18.3 36 903 828 .0

1826

18

.3 54 888 947 .28 -- 181820

141314

15

171616

.3 45 749 826 <.01 <.02 16

.2 37 1,560 1,420 -- .60.65

.3 42 1,020 967 .03 .691.1

.5 37 511 539 <.01 1.5 .23

.3 37 495 511 <.01 3.0 .16

.4 38 507 490 <.01 .73 .21

__ __

16

1415

Manganese,dis

solved(rag/Las Mn)

__

1.8

2.1

2.11.82.22.1

1.82.21.71.81.9

1.91.32.01.93.0

1.5

1.21.31.4

1.51.61.52.02.4

.20

.03

.09

.24

.02

.03

--

31

Table 1. Summary of chemical and physical analyses of water from wells completed in the Red River alluvial aquifer,Louisiana, 1965-92--continued

Well no.

Date

Av-334 08-23-7409-24-7410-23-7411-19-7412-16-74

01-17-7502-11-7503-05-7504-05-7505-24-75

06-18-7507-24-7510-27-75

03-22-7605-27-76

08-16-7611-04-7603-29-7709-15-7703-27-78

09-22-7803-26-7911-28-7904-11-8009-18-80

04-27-8109-29-8104-20-8209-20-8203-21-84

10-24-84

03-14-8510-08-8504-01-8608-29-86

03-26-8706-28-88

AV-339 04-22-7009-23-7403-07-7506-24-8804-18-8904-12-90

AV-364 02-05-7603-22-7605-27-76

11-03-7603-29-77

Water level below land sur

face (ft)

22131896

532

+ 0+ 1

14241118

2326142618

2815291733

34

34263212

18

8211316

5,16,

8.

.19

.48

.52

.29

.83

.35

.14

.69

.79

.02

.80

.95

.23

.45

.05

.82

.11

.12

.73

.45

.07

.63

.07

.95

.85

.90

.92

.60

.18

.83

.95

.12

.48

.88

.47

.47

.39

.225.205.50

22.7215.3917.4426.8519.07

Depth of

well, total (ft)

9090909090

9090909090

9090909090

9090909090

9090909090

9090909090

90

90909090

9090

424242424242

4242424242

Spe

cific con duct

ance (|iS/cm)

1,0201,0001,000

991975

1,010972972

1,0001,000

9781,0101,020

1,1001,090

910895904

1,0701,1101,110

1,590

pH, field (stand

ard units)

6

6666

666

66

6-

6

66

666-

6

_

6-

6-

_-- -

6

6

6666

66

6666

.9

.7

.8

.8

.4

.4

.8

.6

.7

.8

.8-

.8

.8

.9

.9

.6

.9-

.6

_

.9-

.7-

----

.8

.8

.9

.9

.8

.7

.8

.7

.7

.2

.3

.46.36.4

6.9

7.07.1

--

7.0

Hard-

Color ness, Temper- (plat- total ature of inum- (mg/L

water cobalt as (°C) units) CaC03 )

51020 440

420

400390400

15 41021.5 410

400380

5 440400390

20 43015 440

410400

5 400

430400400

400400

400410410410400

450430460

22.0 470380

21.0 -- 460

5 450

1 30020.0 0 30020.5 300

5 38020.5 0 39020.5 0 390

5 880900920

5 930930

Hard

ness, noncarb whole water Calcium, total dis- field solved (mg/L as (mg/L CaC03 ) as Ca)

__ __

0 110

0 100100

__ _

0 110__

41 100

0 1000 110

0 96

-- ____

99

100

11012011090

110120

120 68140 69

90220 89

88

0 220

0 25036 250

__

Magne



as Mg) as Na)

_ __

39 32

40 4740

_ _

39 46

35 50

43 4539 44

40 46

_ __

_ __

38

4838

404738

4536 58

31 7731 56

37 9040 9042 95

80 29

71 3875 29

Potas sium,

dis solved (mg/L as K)

_

4.7

3.5

_

4.4

3.3

4.14.0

4.2

_

_

_

_

4.0

1.12.7

1.21.21.5

3.3

2.2

2.3

32



carbonate,field(mg/L asCaC03 )

450

470

480

350

490460

410

_

500498

170160

180169175

950

930910

Sulfate,dis

solved(mg/L

as S04 )

2.02.22.8

<1.01.2

<1.0

.4<1.0<1.0

.9

.21.4.8

.23.6

.2

.21.0.8

2.6

.4<.2.6.2.4

2.0

.61.2.4.4

.2

.6

.6

.6

.4

.434

200190190240250250

.2<1.0--

1.4<1.0

Chloride,dis

solved

(mg/Las Cl)

3841444346

4749504948

46463798

100

433642

4345

4054515852

6264716497

76

84768276

8372

65616696

110120

1434142015

Fluo-ride,dis

solved(mg/Las F)

__

0.1

__

.2

.1

.3

.2

.3

.1

_

__

__

.1

.2

.4

<.2

.2

.2

.4

.5

.3

Silica,dis

solved(mg/LasSi02 )

__

38

__

48

38

29

4141

45

__ __

__

__

44

4147

475456

36

29

32

Solids,residue

at100 °C,dis

solved(mg/L)

__

555

558

568

587

561584

586

403

617592

754755761

982

969

Solids, Nitro- Nitro- Nitro- Nitro-sum of gen, Nitro- gen, gen, gen,

constit- nitrite gen, nitrite nitrate N02+N03uents, dis- nitrate dis- dis- dis-dissolved total solved solved solvedsolved (mg/L (mg/L (mg/L (mg/L (mg/L(mg/L) as N) as N03 ) as N02 ) as N) as N)

__

554

581 0.04 0.13 0.0 0.04

580

550

585565

__

541

__

690 <.01 ~ <.02

589555

712 <.01 <.02738 <.01 <.02

1,660 <.01 <.02

973

985956

Iron,dis

solved(mg/Las Fe)

1517161516

1615151616

1415141116

141416

15

16

16

21

2119192020

1923

.10

.55

.85

.56

.30

.40

121412

18

Manganese,dis

solved(mg/Las Mn)

0.48.46.50.44

.46

.48

.42

.46

.45

.47

.43

.48

.47

.47

.44

.47

.46

.48

.49

.43

.50

.38

.46

.44

.50

.53

.48

.48

.52

.56

.54

.68

.60

.56

1.62.12.62.12.22.0

8.0

108.5

11

33


Well no.

Date

AV-364 09-15-77 03-27-7805-10-7910-13-87

AV-370 05-14-7408-23-74

09-24-7410-21-7411-18-74

12-16-7401-17-7502-11-7503-05-7504-26-75

06-03-7507-23-7503-22-7605-27-7611-03-76

03-29-7709-15-7703-27-7809-22-7805-10-79

11-29-7904-16-8009-18-8004-27-8109-29-81

04-20-8209-20-8204-18-8309-23-83

03-21-84

10-24-8403-14-8510-08-8504-01-8608-29-86

03-26-8710-13-8704-19-8903-26-9104-28-92


face (ft)

26.94 20.341821

724162017

97,541

317142029

192920

21

4131454646

38412940

18

24112618

.64

.90

.58

.05

.35

.10

.43

.49

.42

.34

.88

.50

.31

.28

.46

.71

.06

.82

.51

.82

.54

.01

.24

.64

.86

.81

.55

.05

.79

.98

.27

.30

.81

.16

.9223.55

7.3724.8011.7414.0215.73

Depth of

well, total (ft)

42 424242

105105105105105

105105105105

105

105105105105105

105105105105105

105105105105105

105105105105

105

105105105105105

105105105105105

Spe

cific con duct

ance (jlS/cra)

1,2401,3801,3601,3801,400

1,4301,4301,4101,420

1,480

1,4701,4501,160

~

~

690

665687

1,220

PH, field (stand

ard units)

6.66.96.9

7.06.26.86.77.0

6.56.96.5

6.4

6.46.66.97.3

6.9

6.8

6.9

_

6.8

7.06.97.17.06.8

7.17.27.06.96.8

Temper

ature of water (°C)

~

212021

20202020

20

212120

_

20,

24,

22.21,21,

20,

20.20.20,

.0

.5

.0

.0

.5

.0

.0

.5

.0

.0

.5

.0

.0

.0

.0

.0

.0

.5

.5

.0

Hard-

Color ness, (plat- total inum- (mg/L cobalt as units) CaC03 )

910 920940

0 1,100

5 600880

5 760740730

810820760740

5 840

5 730740640630

15 680

0 670660620670680

470420380360340

330300290320300

330330350370310

3200 300

10 3305 310

640

Hard


300

27 140

66 190

53 200

0 200

22 170

0 160

__

_ _

727774

7381859073

80727772

170

Magne



as Mg) as Na)

__

80 35

60 38

69 18

83 34

56 45

62 32

65 32

__

_ __

_ __

263028

3530343530

3030 2033 2231 2252 24

Potas

sium, dis

solved (mg/L as K)

2.0

3.9

4.5

3.6

3.8

3.5

4.0

_

_

_

__

4.0

3.13.64.1

34




975

560

690 ~

__

790

730

660

680

~

_

360364367385694

Sulfate,dis

solved(mg/L

as S04 )

8.4<.2<.2

1.2

7971447348

7873787278

7591282464

5351462234

4.47.8

--

2.4118.84.7

13

1212

2.2

.80

.60

.80

.20<.20

13

Chloride,dis

solved(mg/Las Cl)

27223079

2016161820

1817

181817

2118212118

1615141524

2622139.9

9.4

9.33.31.0

294.8

2.82.2

109.3

4.0

3.04.3

109.6

13

Fluo-ride,dis

solved(mg/Las F)

0.1

.1

.1

__

.3

.2

.3

.2

__

__

.2

.2

.3

.3

Silica,dis

solved(mg/LasSi02 )

26

42

37

_

46

43

31

60

--

__

51505146

Solids, Solids, Nitro- Nitro- Nitro-

residue sum of gen, Nitro- gen, gen,at constit- nitrite gen, nitrite nitrate

100 °C, uents, dis- nitrate dis- dis-dis- dis- solved total solved solved

solved solved (mg/L (mg/L (mg/L (mg/L(mg/L) (mg/L) as N) as N03 ) as N02 ) as N)

__

896 1,160

750 737

810 814

_

919 953 <0.01 0.0

923 885 __

619 778

758 815

__

_ __

385 408406 422 <.01409 <.01706 755 <.01

Nitrogen,

N02+N03 Iron,dis- dissolved solved(mg/L (mg/Las N) as Fe)

__

1615

1816181818

18191820

0.01 17

181515

15

14

12

__

6.80

6.906.708.07.50

7.50

6.807.00

<.02 5.70.02 6.70.02 14

Manganese,dis

solved(mg/Las Mn)

__

121111

1.4

1.71.31.5

1.51.81.51.51.6

1.41.41.31.2

1.4

1.4

1.6

.68

.70

.42

.43

.60

.48

.38

.52

.56

.42

.76

.81

.662.0

35


Well no .

Date

Water level below landsur

face(ft)

AV-371 09-24-7410-23-7411-19-7412-16-7401-17-75

02-11-7503-05-7504-05-7505-24-7506-18-75

10-27-7503-22-76

05-27-7608-16-7611-04-76

01-20-7703-29-7709-15-7703-27-7809-22-78

03-26-7911-29-7904-11-8009-18-8004-27-81

09-29-8104-20-6209-20-8203-21-8410-24-84

03-14-8510-08-8504-01-8608-29-8603-26-87

AV-372A 05-14-7408-23-7409-24-7410-21-7411-18-74

12-16-7401-17-7502-11-7503-05-7504-26-75

06-03-7507-23-7503-22-7605-27-7611-04-76

13.4116.579.116.785.33

1.952.65,87

+ 1.07+ 0.77

24.11.

,23

,4717.9223.26.

22.16.26.18.28.

15.29.17.33.34.

34.26.32.12.18.

8.21.13.16.5.

7.

24.16.20.13.

9.6.5.5.1.

12.14.20.28.

,90,14

3779724507

6904958590

956322

7597

0753924545

8736684345

8477732093

8065376598

Depth

of well, total(ft)

136

136136136136

136

136136136136

136136136136136

136136136136136

136136136136136

136136136

136136

136136136136136

173173173173173

173173173173173

173173173173173

Spe

cific con duct

ance(US /cm)

979

976915842875

874824817807780

882

822

1,3901,4101,4101,4001,390

1,4001,4101,4001,4001,430

1,4401,460

pH, Color field Temper- (plat- (stand- ature of inum- ard water cobalt

units) (°C) -units)

6.7 -- 5

7.07.16.77.2

6.7

7.27.1 -- 77.17.1

7.1 0

7.06.97.0 10

20

6.96.9

6.6 5

6.9__

6.9 ~

__ _ ___

6.97.0

7.1

7.06.96.87.0

6.8 56.47.0 21.0 56.6 20.56.8 20.5

6.4 20.56.8 20.56.7 20.06.9 20.06.2 20.5 5

6.6 20.5 56.7 21.07.0

7.15

Hard

ness, total (mg/L as

CaC03 )

400400380340360

340320320320300

340420420440410

420420410

440420

370350340320300

300270290280300

320300320280300

720860740730740

750740720720750

670690760800740

Hard

ness, noncarb whole water Calcium, total dis- fleld solved (mg/L as (mg/LCaC03 ) as Ca)

57 94

__ _

0 8180

7 90

0 10042 11045 110

__ __

51 110

_ _

_ _

7168

8267807175

0 210

2 190

__ __

0 190

200

0 190

Magne


solved solved

(mg/L (mg/Las Mg) as Na)

41 33

_ _

28 4228

29 46

41 5939 5533 51

_ __

39 57

__ _

__

2531

2731292627

47 36

64 27

___ ___ ___

66 42

42 40 _ __

_ __

64 41

Potas

sium, dis

solved (mg/Las K)

3.7

_

3.5

4.03.52.9

_

3.6

_ _ _

__

_

8.3

5.2

___

6.8__

_

7.5

36


Alkalin ity, as calcium

carbonate, field (mg/L as CaC03 )

340

340

340

480390360

370

370

730

740

_

770

740

840

Chlo-

Sulfate, ride,

dis- dis solved solved (mg/L (mg/L

as S04 ) as Cl)

3.63.6

152.61.0

.8<1.0<1.0

.1<1.0

.8<1.01.2

<1.0.2

1.81.22.8

8.8.2

<.2

4.82.42.4.4

.4

.2

.29.4.8

.4

1.0.4.4.6

5.23.24.81.43.4

<1.0

.61.0

<1.02.0

<1.0

.64.0.6

10

10088446671

7673615854

754041

120110

110100110110110

9779506446

5140484343

4846484647

4124444545

4445464644

4543424542

Solids, Solids, Nitro- Nitro- Nitro- Nitro- Fluo- Silica, residue sum of gen, Nitro- gen, gen, gen, ride, dis- at constit- nitrite gen, nitrite nitrate NC^+NC^ Iron,

dissolved 100 °C, uents, dis- nitrate dis- dis- dis- dis solved (mg/L dis- dis- solved total solved solved solved solved (mg/L as solved solved (mg/L (mg/L (mg/L (mg/L (mg/L (mg/L as F) Si02 ) (mg/L) (mg/L) as N) as N03 ) as N02 ) as N) as N) as Fe)

0.2 28 562 528 17

17131617

1616

.2 33 458 466 <0.01 0.0 0.16 161615

.2 18 495 480 1415

.3 44 567 593 15

.2 32 603 596

.3 37 581 560

1717

.2 32 640 602 17

17

14

__

11

151315161 6

.3 39 846 830 ~ 7.88.2

.2 38 832 13138.9

13141314

.3 45 874 869 .06 0.10 .20 0.02 .08 14

.3 38 873 817121313

.3 47 903

Manga

nese, dis

solved (mg/L as Mn)

1.41.51.4.96

1.4

.801.51.0.94.92

1.0.48.44

1.3

1.21.3

1.1

1.1

.86

.59

.87

.88

.68

.761.0

.59

.62

.66

.67

.67

.60

.65

.60

.60

.55

.68

.72

37


Well no.

Date


face(ft)

AV-372A 04-28-7709-15-7703-27-7809-22-7805-10-79

11-29-7904-11-8004-27-8109-29-8104-20-8209-20-82

04-18-8309-23-8303-21-8410-24-8403-14-85

10-08-8504-01-8608-29-8603-26-8710-13-87

04-19-8903-26-9104-26-92

AV-381 01-13-7604-08-7607-09-7612-09-7603-29-77

09-16-7703-28-7809-22-7803-26-7911-27-79

04-10-8009-18-8004-27-8109-28-8104-19-82

09-22-8204-20-8309-23-8303-20-8410-23-84

03-25-8510-11-8504-02-8608-28-8606-15-87

06-24-8804-16-90

12.3729.5120.8430.8221.37

40.8232.0546.6746.5438.3740.95

29.6640.18.

7707

24.33

11.

26.18.23.8.

24.

11.14.17.

21.14.17.24.18.

24.20.26.11.21.

14.25.26.26.22.

25.15.25.13.20.

10.23.

17.18.13.

18.4.

85

7399804390

881212

1395

901846

4596809066

0205752428

8890455988

9567

643966

0192

Depth of

well, total(ft)

173173173173173

173173173173173173

173173173173

173

173173173173173

173173173

150150

150150150

150150150150

150

150150150150150

150150

150150150

150150

150150150

150150

Spe

cific pH, con- field duct- (stand- ance ard(fiS/cm) units)

6

61,420

7

1,150

76

6

76

6800 7

7

732 7658 7645 6

6767

7

76

7

76

.9-

.7-

.0

_-----

_-

.0

.9

.9

.1

.9

.9

.0

.0

.0

.0

.9

.9

.3

.9

.2

.2

.2

.7

.2

.0

.97.17 ..07.1

7.07.1

7.07.07.2

6.87.17.07.07.1

960 6.8938 7.2

Color Temper- (plat- ature of inum- water cobalt(°C) units)

20.0 30

20.0

20.5

20.22.

22.20.20.20.

20.21.21.

20.

20.

20.

20.20.

20.20.

20.20.20.20.20.

20.20.20.20.21.

21.20.

20.20.20.

20.20.

,5,0

0,0

50

0

5 100 55

50

0

0 0

0 55

00

55555

55

550

55550

5 50 0

Hard

ness,total (mg/L as

CaC03 )

700710680720700

570540400420430430

410430390380400

430410

380360390

320260250

220220210190

200

190190200190210

200200200200210

210220

250320210

230260

280230240

320330

Hard

ness, noncarb whole water Calcium, total dis- field solved (mg/L as (mg/LCaC03 ) as Ca)

0 180

__ _

1001101009699

110100

9690

100

0 796763

0 67 __

0 55

0 52

__ _

-- __

55658454

5965766063

8583

Magne



as Mg) as Na)

62 39

_ _ --

3937353536

3740333333 38

29 2723 2722 29

14 100

15 120

14 110

_ _

_ __

19

212719

2023

231921

25 12029 100

Potas

sium, dis

solved

(mg/Las K)

7.3

_

_

_

4.8

4.33.94.1

2.8

3.1

2.7

_ ~

_

_

2.62.9

38




770 ~

_

410400

321232186

360

370

340

_

_

_

398

466455

Sulfate,dis

solved(mg/L

as S04 )

6.8126.8.4.6

311714141435

8.26.01.22.64.0

2.61.2.6.6

5.0

142039

7.8287.84.48.2

6.66.64.46.67.4

6.89.06.46.04.2

7.47.09.8

136.2

7.2

127.68.26.6

1411

Chloride,dis

solved(mg/Las Cl)

4240404160

383428303736

3432302928

4830272221

346068

55555770

62

6463666564

6462636466

666156

49

63

6056

625758

4661

Solids, Solids, Nitro- Nitro- Nitro- Nitro-Fluo- Silica, residue sum of gen, Nitro- gen, gen, gen,ride, dis- at constit- nitrite gen, nitrite nitrate N0^+N03 Iron,dissolved 100 °C, uents, dis- nitrate dis- dis- dis- dis

solved (mg/L dis- dis- solved total solved solved solved solved(mg/L as solved solved (mg/L (mg/L (mg/L (mg/L (mg/L (mg/Las F) Si02 ) (mg/L) (mg/L) as N) as N03 ) as N02 ) as N) as N) as Fe)

0.1 35 861 846 0.0 13

12 __ __ __ __ __ __ __ __ __ 12

__ _ __ _ __ _ __ _ __ _

7.77.67.8

7.17.87.56.4

.1 46 450 494 1.2 6.0

.2 45 382 432 <0.01 .48 4.8

.3 44 417 389 <.01 .02 4.5

.3 44 396 485 <.10 .02 4.3

.5 32 508 497 -- 2.32.3

_ _ __ _ __ __ __ _ ,__ 22

1.9.6 41 502 528 -- 2.3

.6 32 485 491 2.12.1

2.3

2.2

2.22.12.42.32.6

2.32.52.7

4.92.6

2.12.62.72.72.6

.4 34 553 610 <.01 <.02 3.5

.6 35 560 599 <.01 <.02 3.6

Manganese,dis

solved(mg/Las Mn)

0.60

.61

.73

_

.34

.34

.40

.39

.44

.40

.33

.52

.68

.37

.25

.23

.18

.14

.14

.08

.12

.12

.14

.14

.13

.12

.13

.15

.13

.17

.20

.17

.14

.19

.16

.13

.15

.24

.13

.15

.23

.18

39


Well no.

Date


face(ft)

AV-382 01-13-7604-08-7607-09-7612-09-7603-29-77

03-28-7803-26-7911-27-79

05-14-8004-20-83

03-20-8410-23-8403-25-8510-11-8504-02-86

08-28-8606-15-8706-24-8804-16-90

CT-74 04-27-7409-19-7410-25-7411-29-7412-19-74

01-28-7504-05-7507-21-7510-29-7503-23-76

05-28-7606-28-7610-22-7603-30-7709-16-77

03-28-7809-25-78

05-14-7911-28-7904-10-80

04-28-8109-28-8104-20-8209-21-8204-19-83

20.

15.17.24.17.

20.12.21.15.14.

13.20.10.23.17.

18.13.17.4.

13.16.7.5.

4.+ 1.

9.20.10.

15.16.23.14.23.

7570512068

6750519293

0541470417

08244383

30304061

9076776220

1570706045

16.4325.34.46.39.

53.

54.45.45.37.

25600570

4000041216

Depth of

well, total(ft)

3737373737

3737373737

3737373737

37373737

196196196196196

196196

196196196

196196196196196

196196196196196

196196196196

196

Spe

cific con duct

ance(jiS/cm)

__

_

570588

939948930886

954960

961929927

921925963938931

9081,070

870931

pH, field (stand

ardunits)

6.77.06.8

6.8

6.7

7.1

7.0

6.37.06.8

6.86.86.66.9

7.26.77.27.0

7.27.17.17.37.2

7.37.27.17.27.2

6.9

Color Temper- (plat- ature of inum- water cobalt(°C) units)

__

20.20.

20.

20.

21.21.19.

20.20.20.20.

20.20.20.20.

20.20.20.20.20.

20.20.

20.20.

20.

0

0

50

0

0

005

505 50 0

0 5000

00 10

0 00 00

00

00 10

0

0

Hard

ness,total (mg/L as

CaC03 )

500450450490400

350310340350330

320330300320300

350320330350

9289899598

9694

9391

100

100110100110110

120150210190190

130120170170

230

Hard

ness, noncarb whole water Calcium, total dis- field solved (mg/L as (mg/LCaC03 ) as Ca)

1 130

0 100

_ _ __

8076807776

86809086

__

0 23

__

0 250 230 22

_

0 290 39

_ _

60

Magne



as Mg) as Na)

42 6.5

37 4.7

_ _ __

2835253026

323025 5.033 5.0

_ __

7.7 190 ~

_ _

7.7 200

8.6 1908.7 190

_ __

7.9 1902.6 180

_ __

_ __

19

Potas

sium, dis

solved (mg/Las K)

0.3

.3

_

_

__

.31.0

_

5.3

_

3.53.24.8

_

3.84.6

_

_

40



carbonate, field

(mg/L as CaC03 )

490

400

_

_

_

308318325

_

440

_

450440450

_

430460

_

_

Sulfate, dis

solved

(mg/L as S04 )

1015109.6

11

9.48.8

108.68.4

8.56.6

109.46.0

8.27.6

1212

__

2.22.24.0.6

.8

.3<1.0

.86.2

.6

.2

1.8<1.0

.86.4

.4

.613

5.03.8

2420

.4

Chlo

ride, dis

solved

(mg/L as Cl)

3.63.83.04.21.8

2.01.81.01.21.8

4.44.04.57.04.2

3.64.75.55.5

4845464647

4547

484445

4444454245

4343

685568

6857

626458

Solids, Solids, Nitro- Nitro- Nitro- Nitro- Fluo- Silica, residue sum of gen, Nitro- gen, gen, gen, ride, dis- at constit- nitrite gen, nitrite nitrate N0^+N03 Iron, dissolved 100 °C, uents, dis- nitrate dis- dis- dis- dis

solved (mg/L dis- dis- solved total solved solved solved solved (mg/L as solved solved (mg/L (mg/L (mg/L (mg/L (mg/L (mg/L as F) Si02 ) (mg/L) (mg/L) as N) as N03 ) as N02 ) as N) as N) as Fe)

1.0 25 499 510 0.14

.33

.12

.3 29 404 426 .17

.09

.24

.13

.22

.85

.921.22.42.3

i.o3.0

.2 28 201 361 <0.01 0.41 2.7

.4 27 349 369 0.02 0.07 .66 .68 1.2

__

.5 32 578 571 0.35 .19.25.28.31

.41.6 34 597 596 .01 .03 1.69 1.7 .30

.5 33 597 568 .05 -- .31

.4 31 578 572 .27 .33.43

.42

.44.1 35 585 4.4 .33.3 10 577 584 1.2 .54

.66

.75 __

___

Manga

nese, dis

solved

(mg/L as Mn)

0.38.16.14.26.25

.35

.30

.37

.18

.14

.24

.24

.16

.34

.18

.30

.26

.26

.09

.08

.10

.10

.14

.10

.09

.12

.13

.12

.19

.12

.14

.17

.20

.26

.25

.20

.22

.16

.12

.20

.28

.32

41


Well no.

Date

CT-74 09-26-8303-20-8410-23-8403-25-8510-11-85

04-02-8608-28-8606-15-87

06-23-8804-18-89

03-26-9104-28-92

CT-75 04-21-7010-18-7211-28-7212-19-7210-01-73

12-03-7309-23-7410-25-7411-29-7412-19-74

01-28-7507-21-7510-29-7503-23-7606-29-76

10-26-7603-30-7709-16-7703-28-7809-25-78

11-28-7904-10-80

09-19-8004-28-8109-28-81

04-19-8209-21-8204-19-8303-25-8510-11-85

04-02-8608-28-8606-15-8706-23-8804-19-8904-12-90

Water

level below land sur

face (ft)

45.38

14.7121.187.98

23.96

15.1020.5413.3420.408.30

10.5613.37

5.778.089.477.686.49

3.982.459.085.658.10

13.219.70

13.2510.4314.10

14.219.40

16.2718.37

18.76

16.5218.179.827.32

14.77

11.0816.3310.5715.427.966.80

Depth of

well, total (ft)

196196196196196

196196196

196196

196196

107107

107107107

107107107107107

107107107107107

107107107107107

107107

107107107

107107107107107

107107107

107107107

Spe

cific con duct

ance (US /cm)

_

1,2901,320

1,3301,300

741690751750

752755746657743

748756725745749

751730750714863

714

pH, field (stand

ard units)

_

7777

77777

77

_----

_

6-.

66

76766

76777 .

_.

7,

6,7,6,

_

.1

.3

.1

.1

.3

.1

.2

.2

.2

.2

.2

_----

_

.9-

.8

.9

.1

.9

.1

.8

.6

.0

.9

.0

.0

.0

.0

.9

.0

.9

7.06.96.86.77.1

7.27.17.1

740738766

7.07.27.2

Color Temper- (plat- ature of inum- water cobalt (°C) units)

_

20202120

2020202121

2121

2019

192020

2019202020

2020,20,20,20.

20.

__.0.0.5.5

.0

.5

.0

.0 0

.0 5

.0 5

.5

7

.0

.5 5

.5

.0

.0

.0

.5 0

.0 0

.0

.0

.0 0

.0 10

.0

.0

.0

.020.020..020.020.0

20.020.020.021.020.0

20.020.5

20. 021.0 020.20.

5 50 0

Hard


CaC03 )

230

230240250260

290290330

300290

281270

340330

320320320

450340

340340340

330330330340340

330320340310320

320320320310

310

320310320330320

360340

340350310330

Hard

ness, noncarb

whole water Calcium, total dis- field solved (mg/L as (mg/L CaC03 ) as Ca)

56

59586462

7071858070

7372

0 9691

9192

_

0 92

__ __

0 980 86

--

0 920 100

_

__ _

889185

10094

951008694

Magne



as Mg) as Na)

21

20222226

28282825 17028 170

24 19022 190

25 2724

2323~

_ _

26 32

_ __

20 2928 30

24 2918 30

_ __

__

252625

2725

2524 3223 3022 30

Potas

sium, dis

solved (mg/L as K)

__

4.74.5

5.35.0

6.0

_

7.1

__

5.76.8

6.46.9

__

__

5.86.66.7

42

Table 1. Summary of chemical and physical analyses of water from wells completed in the Red River alluvial aquifer,Louisiana, 1965-92-continued


carbonate, field (mg/L as CaC03 )

__

_

472486509

523523

380

_

360

_

360350

340350

_

_

_

364371357370

Sulfate, dis

solved (mg/L

as S04 )

1.6.3.2.2

1.6

.4

2.26.0

168.2

1.22.8

.4 --

__

.4

2.42.22.2

.4<1.0

.8<1.0

1.2

<1.0

.4<1.0

.8

.4

1.23.24.4.2.6

.2

.2

.8

.21.0

.6

.4

.212<.l1.2

Chlo

ride, dis

solved (mg/L as Cl)

58

667786

110

130130130130130

130130

26283026

28

3428

272830

27292925

26

2528263132

2624242629

2927

2828

30

26272822

2826

Fluo-

ride, dis

solved (mg/L as F)

__

_

0.2.4

.3

.3

.5

__

.2 --

__

.2

.3 --

.1

.2

_

__ --

__

.2

.2

.4

Silica, dis

solved (mg/L as Si02 )

_

3535

3433

34

_

38

_

4139

4252

__

_

_

424243

Solids, residue

at 100 °C, dis

solved (mg/L)

__

743745

763780

432

__

485 --

__

445444

--

435436

_

_--

_

419422423

Solids, Nitro- Nitro- Nitro- Nitro- sum of gen, Nitro- gen, gen, gen,

constit- nitrite gen, nitrite nitrate N02+N03

uents, dis- nitrate dis- dis- dis- dis- solved total solved solved solved

solved (mg/L (mg/L (mg/L (mg/L (mg/L (mg/L) as N) as N03 ) as N02 ) as N) as N)

_ _ _ __ _ _

755 <0.01 <0.02753 <.01 <.02

774 <.01 .02770 <.01 .02

446 0.0 __

444 .30__

441 .03436 .07

__

434 11454 .38 __

_ _ _ __ _ ________

___

___

466 <.01 .20 <.02422 <.01 <.02451 <.01 <.02

Iron, dis

solved (mg/L as Fe)

_

1.21.31.21.3

1.41.41.51.61.5

1.51.3

4.8

2.05.2

5.35.25.3

5.35.05.05.4

5.5

5.15.35.35.24.9

5.15.34.94.84.7

4.74.9

5.05.2

5.1

5.25.55.15.14.65.2

Manga

nese, dis

solved (mg/L as Mn)

0.21.24.31.28.40

.48

.29

.40

.76

.37

.36

.27

.60

.72

.73

.70

.68

.68

.65

.76

.78

.80

.77

.72

.77

.95

.84

.74

.76

.70

.73

.70

.69

.74

.68

.67

.62

.56

.84

1.1

.56

.72

43


Well no.

Date

CT- 81 04-21-70 09-19-74 10-25-74 11-29-74 12-19-74

01-28-7504-05-7507-21-7510-29-7503-23-76

06-28-7610-22-7603-30-7709-16-7703-28-78

09-25-7805-14-7911-28-7904-10-8009-19-80

04-28-8109-28-8104-20-8209-21-8204-19-83

09-26-8303-22-8410-23-8403-25-8510-11-85

04-02-8608-28-8606-15-8706-23-8804-20-8904-16-90

CT-96 02-05-7603-23-76

05-28-7606-28-7610-22-76

03-30-7709-16-7703-28-7809-25-7804-02-86


face (ft)

14.59 17.85 9.80 6.79

6.29+ 0.9711.4622.2811.55

18.2325.3516.5025.5517.78

26.85

31.1044.4237.2549.74

49.1848.8040. 92

42.3633.60

42.3013.4020.00

7.0422.72

14.0019.0311.3018.907.61

3.52

18.9310.3614.6616.2823.31

14.6123.4616.1926.3414.61

Depth of

well, total (ft)

108 108 108 108 108

108108108108108

108108108108108

108108108108108

108108108108108

108108108108108

108108108108108108

7676767676

7676767676

Spe

cific con duct

ance (fiS/cm)

868 898 890 859 890

917901917891900

879928934926695

1,080

862826

_

__

877881844

1, 980

1,9701,9402,090

2,0802,0102,1202,370

PH, field (stand

ard units)

6.67.1 6.7 6.7

6.86.76.86.97.1

7.16.97.17.16.5

__

__ --

_

6.87.0

6.77.0

7.17.06.96.97.0

7.2

7.16.77.06.96.8

7.1

6.6

6.9

Temper


20.0 20.0 20.0 20.5

20.020.020.020.020.0

20.0

20.020.020.0

_

_

_

20.021.0

21.021.0

20.020.520.022.020.520.5

Hard-


7 350 440 360 350 350

35010 3500 3300 340

350

3505 360

10 350340350

370340320320310

310330290

290300

320300310310290

320300310

5 28010 310

5 340

5 1,000940940

60 9405 980

20 1,000970

1,0001,0001,150

Hard


0 88

__ __

0 880 870 90

__ __

0 810 96

__ __

__ __

72

817470

7569

8075757073

0 80

0 250

300 250360 160

290 260

280

Magne-

, sium, Sodium, dis- dis

solved solved

(mg/L (mg/L as Mg) as Na)

31 58

_

32 6327 7028 66

_ __

38 6527 65

_ __ __

_ __

29

282732

3029

30272926 8030 81

33 72

92 61

77 76140 81

95 79

110

Potas

sium, dis

solved (mg/L as K)

2.5

_

2.52.53.0

_

2.73.1 --

_

__

__

_

2.32.4

2.6

5.4

4.44.4

5.1

44



carbonate, field

(mg/L as CaC03 )

450

_

420440420

_

450440 ~

_

_

_

~

_

442459461468

630

630640

750

Sulfate, dis

solved

(mg/L as S04 )

0.8<1.0

8.63.24.6

3.0<1.0<1.02.6

<1.0

.6<1.0

.4<1.0<.2

<.2<.22.41.8.4

1.6

.2

.2

.2

.6

2.4

.6

.8

.22.2

.6

.4

.2

.22.6

220200150180240

220210290230140

Chlo

ride, dis

solved (mg/L as Cl)

2832443436

3435363935

35

3536

3738

3952353124

2528272119

20

20191724

191919192225

180180170180190

180170

200180220

Fluo-

ride, dis

solved

(mg/L as F)

0.4--

.3

.2

.3

__

.1

.3

__

__

_

__

.2

.3

.4

.2

.2

.1

.2_-

Silica, dis

solved (mg/L as Si02 )

25

353531

__

3645

_

__

_

_

323334

44

3936

46 __

Solids, residue

at 100 °C, dis

solved (mg/L)

491

530535520

531521

__

--

_

_

493501500

__ --

1,3301,260

1, 580

Solids, Nitro- Nitro- Nitro- Nitro- sum of gen, Nitro- gen, gen, gen,

constit- nitrite gen, nitrite nitrate NC^+N03 uents, dis- nitrate dis- dis- dis- dis- solved total solved solved solved

solved (mg/L (mg/L (mg/L (mg/L (mg/L (mg/L) as N) as N03 ) as N02 ) as N) as N)

509 11

537 <0.01 -- 0.0 ~ 5.0527 .05512 .25

__

551 23544 ~ .11

__

___

_______--

_

530 <.01 -- <.02527 <.01 <.02539 <.01 <.02

1,240 1.1 __

1,190 6.71,250 7.8

1,340 .79 ______

Iron, dis

solved (mg/L as Fe)

6.87.67.58.17.6

6.87.67.4

7.6

6.86.37.57.37.2

7.97.27.77.2

7.57.57.1

6.37.57.8

8.57.98.47.87.7

8.2

8.3

15

Manga

nese, dis

solved

(mg/L as Mn)

0.60.63.65.60.60

.58

.56

.55

.61

.65

.67

.60

.58

.59

.60

.66

.57

.47

.53

.51

.53

.58

.53

.60

.57

.51

.55

.56

.58

.42

.52

.60

.84

.92

.69

.64

3.22.62.72.62.7

2.72.33.0

3.0

45


Well no.

Date

CT-96 08-28-8606-15-8709-19-8804-18-8903-26-9104-28-92

R-733 04-23-5810-08-5806-02-6707-08-8009-25-81

04-16-8209-22-8303-14-8410-12-8403-19-85

10-04-8504-01-8610-30-8606-15-8707-01-8804-16-90

R- 744 10-08-5811-03-5806-02-6704-14-7608-05-76

04-14-77

10-27-7703-30-7805-17-7910-24-79

03-19-8009-24-8004-22-8109-23-8104-15-82

09-01-8204-20-8303-29-8510-07-8504-03-86

10-30-86

06-15-87


face (ft)

19.8611.9820.857.84

10.1712.96

__

26.90

21.6325.9513.2223.5711.57

23.1218.6017. 9413.6520.085.18

_

6.658.33

6.75

8. 996.95

6.259.02

6.0512.2712.32

13.858.29

11.134.085.918.786.96

9.216.44

Depth of

well, total (ft)

767676767676

80808080

80

8080808080

808080808080

8484848484

84

84848484

8484848484

8484848484

8484

Spe

cific con duct

ance (US/ cm)

__

2,110

1,9301, 910

1,9801,060

1,3901,480

_

1,8101,5001,490

1,490

1,4801,1201,440

1,410

pH, field (stand

ard units)

6.6.7.

6.6.6.

--

6.

6.7.6.

6.

__

6.6.6.6.7.

_

6.6.7.

7.

6.6.6.6.

7.6.6.

6.6.

6.6.6.7.6.

6.6.

890998

4

857

9

968

80

380

0

8577

08677

8

8418

68

Temper


21.22.

21.

20.

21.

21.

__

20.20.21.

20.

20.

21.

_

20.20.

20.20.

20.

21.20.19.

20.20.

00

0

0

0

5

550

0

0

0

0000

0

005

00

Hard-


1,1001,110

10 1,10010 9905 950

870

790740

580600

600610620620620

650730740760

0 7500 720

750750

0 690690

690

5 680680680660

650700680700690

690700620650750

710740

Hard


270280

0 280250250230

120120110120

120140140150

100 150130

_

260 180

240 170 __--

__ ____

_-

180150160180

170

190

Magne



as Mg) as Na)

10010090 100

88 8879 8171 85

~

76788577

85929593

90 8095 75

__

58 68

62 66

_ _

_ _

62606074

70

65

Potas

sium, dis

solved (mg/L as K)

_

4.25.64.34.0

1.81.6

__

3.0

4.3 --

_

--

_

46



carbonate, field

(mg/L as CaC03 )

__

747789

767788782

__

__

__

628644686

__

430

__

450

__

_

__

449

Sulfate, dis

solved

(mg/L as S04 )

250240210

180110110

350

35093

91

80110120120120

82110120140150190

310

220210

220210

190140

170

190230220180

170230240

290230

200210

Chlo

ride, dis

solved

(mg/L as Cl)

210210180

170160150

60£i QDO

26

27

3032313421

413334393535

150

_

130120

120120140140120

120

130120120140

120120140

140130

120130

Solids, Solids, Nitro- Nitro- .Nitro- Nitro- Fluo- Silica, residue sum of gen, Nitro- gen, gen, gen, ride, dis- at constit- nitrite gen, nitrite nitrate NC^+N03 Iron, dissolved 100 °C, uents, dis- nitrate dis- dis- dis- dis

solved (mg/L dis- dis- solved total solved solved solved solved (mg/L as solved solved (mg/L (mg/L (mg/L (mg/L (mg/L (mg/L as F) Si02 ) (mg/L) (mg/L) as N) as N03 ) as N02 ) as N) as N) as Fe)

139.8

0.4 39 1,130 1,390 <0.01 0.03 6.0

.2 39 1,370 1,290 <.01 <.02 6.1

.2 39 1,200 1,200 <.01 -- .02 5.9

.2 38 1,200 1,160 <.01 <.02 5.5

4.63.33.63.43.6

3.23.14.8

.4 29 706 928 <.01 .02 4.3

.3 31 946 974 <.01 <.02 3.7

_

.3 42 1,050 965 0.0 6.16.4

6.8

.1 36 995 947 .0 6.75.26.76.2

7.07.2

7.37.37.5

7.17.26.8

__ __ __ 5.7

7.6

6.97.4

Manga

nese, dis

solved

(mg/L as Mn)

2.63.73.1

2.82.12.0

.69

.65

.71

.72

.72

.74

.78

.76

.84

.961.21.21.2

--

.23

.26

.22

.25

.26

.27

.23

.27

.24

.26

.25

.24

.25

.32

.36

.36

.46

.24

.28

47


Well no.

Date

R-963 11-02-72 11-28-72 12-19-72 02-14-73 06-19-73

08-08-7303-25-7402-19-7503-05-7506-17-75

04-09-7611-01-7604-15-7710-27-7703-30-78

09-27-7803-28-7910-24-7903-19-8009-23-80

04-22-8109-23-8104-15-8203-14-8406-05-85

10-04-8504-02-8608-27-86

06-15-8704-13-8904-16-90

03-28-9104-01-92

R-1102 04-14-7608-05-7604-14-77

10-27-7703-30-78

09-27-7805-21-8009-24-8004-22-8109-23-81

04-15-8209-01-8210-07-85

04-03-8608-27-86

06-15-87

06-28-8804-20-90

Water level below land sur face (ft)

7554

9197

1812

217.171121

2021188

11

1713161064

95

636

86

104

121213

.60

.55

.48

.18

.29

.48

.67

.95

.76

.5093.47.58.07

.70

.60

.25

.57

.18

.70

.23

.30

.35

.26

.51

.44

.82

.61

.30

.66

.93

.87

.73

.85

.24

.27

.84

9.241110

89

.02

.38

.61

.70

6.4610.096.12

Depth of

well, total (ft)

60 60 60 60 60

6060606060

6060606060

6060606060

6060606060

606060606060

6060

127127127

127127

127127127127127

127127127

127127

127127127

Spe

cific con duct

ance (|iS/cm)

1,060 1,000 1,100 1,0701,110

1,2101,1601,1601,150

1,1401,1601,1301,020

953

862902

936

866855

9771,030

1,6801,6801,670

1691,700

1,630

1,5701,580

pH, field (stand ard

units)

-

Color Temper- (plat- ature of inum- water cobalt (°C) units)

.

7.16.96.86.5

6. 6

212020

206.66.6.6.

6.

7.6.6.6.

6.6.6.

7.

7.7.7.6.7.7.

7.6.

6.6.6.

6.6.

6.

7.7.6.6.

6.6.7.7.6.

6.6.7.

999

90989

799

1

101901

09

999

96

9

0089

992

08

870

2120

__

21

212021202121

2222

20

20

__

202020

_

20

20

202020

.0

.5

.5 0

.5 50

.0

.5

.0

.0

.0

.0

.5

.0 10

.0 0

.5 5

.0

.0 0

.0

10

.0

.0

.0

.0

.5

.0

.0 5

.0 5

Hard


CaC03 )

510 540 530 570 570

590640600600580

590530580600490

480490530500490

490500510510600

500570510580460470

497550

740770750

750850

760720720

720720

700680670

730760

740730720

Hard


88100 98

110 110

__

0 120

0 1300 1100

50 120

__ _ ~

_ _

100120

889580

11077

0 84

9298

300 190

290 140

__ _

_ __

170

180190

190

190 190180

Magne- Potas sium, Sodium, sium, dis- dis- dis

solved solved solved (mg/L (mg/L (mg/L

as Mg) as Na) as K>

71

70 70 71 72

__

67 50 0.6

64 43 .762 44 .7

_ _ _ ~

_ _ _

6373

6880757564 18 .564 20 1.0

65 32 <1.074 35 .8

65 90 3.2

96 100 4.7

_ __ _

_ __ _

596770

65

62 110 3.366 94 3.1

48



carbonate field (mg/L as CaC03 )

600

600580630550

509474497

547564

440

460

_

_ ~

431434462

Solids, Solids, Nitro- Nitro- Nitro- Nitro- Chlo- Fluo- Silica, residue sum of gen, Nitro- gen, gen, gen,

Sulfate, ride, ride, dis- at constit- nitrite gen, nitrite nitrate N02+N03 Iron,

, dis- dis- dissolved 100 °C, uents, dis- nitrate dis- dis- dis- dis solved solved solved (mg/L dis- dis- solved total solved solved solved solved (mg/L (mg/L (mg/L as solved solved (mg/L (mg/L (mg/L (mg/L (mg/L (mg/L

as S04 ) as Cl) as F) Si02 ) (mg/L) (mg/L) as N) as N03 ) as N02 > as N) as N) as Fe)

46 44

4339

4437455234

24

40452725

3428283036

362527312730

2644

300290280280270

250240270

290270

280200200190260

200260270

101012 8.0

12

12 12 161g __ __ __ __ __ __ __ _ __

14 0.4 27 701 681 0.36

12 .5 29 683 686 .53

11 .2 30 671 649 1.49.96.65.0

4-14.07.05.62.1

2.91.84.22.14.4

5.43.41.73.22.6 .6 27 484 504 <0.01 <0.027.4 .4 28 513 536 <.01 <.02

2.0 .5 28 560 <.01 .025.4 .6 30 594 629 <.01 <.02

160 .3 38 1,170 1,120 .0140140140 .1 33 1,140 1,070150

140140140140

140

150130120120130

140120 .2 35 745 1,040 <.01 -- <.02140 .2 35 1,070 1,070 <.01 <.02

1.6

2.8

2.6

2.02.11.91.7

1.42.4

1.81.8

1.91.81.8

1.7

2.21.8

2.01.91.61.7

2.21.8

6.15.75.7

4.7

4.25.86.06.06.1

5.04.36.77.26.8

7.16.96.1

Manga nese, dis

solved (mg/L as Mn)

1.3.12

1.6

1.61.61.71.61.6

1.41.71.81.61.5

1.61.62.21.71.6

2.5

1.61.72.01.11.6

2.11.6

.20

.21

.20

.20

.23

.23

.22

.21

.21

.18

.24

.24

.44

.24

.52

.52

.22

.18

<r U.S. GOVERNMENT PRINTING OFFICE: 1994-566-216

49

QUALITY OF WATER IN THE RED RIVER ALLUVIAL AQUIFER, …AQUIFER, POOL 1, RED RIVER WATERWAY AREA,...

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Transcript of QUALITY OF WATER IN THE RED RIVER ALLUVIAL AQUIFER, …AQUIFER, POOL 1, RED RIVER WATERWAY AREA,...