Hydrologic, Lithologic, and Chemical Data For Sediment in ... · Hydrologic, Lithologic, and Chemical Data For Sediment in the Shallow Alluvial Aquifer at Two Sites near Fallon, Churchill

Hydrologic, Lithologic, and Chemical Data For Sediment in the Shallow Alluvial Aquifer at Two Sites near Fallon, Churchill County, Nevada, 1984-85

By Michael S. Lico, Alan H. Welch, and Jennifer L. Hughes

U.S. GEOLOGICAL SURVEY

Open-File Report 86-250

Carson City, Nevada

1986

UNITED STATES DEPARTMENT OF THE INTERIOR

DONALD PAUL HODEL, Secretary

GEOLOGICAL SURVEY

Dallas L. Peck, Director

For additional information write to:

U.S. Geological Survey Room 227, Federal Building 705 North Plaza Street Carson City, NV 89701

Copies of this report may be purchased from:

Open-File Services Section U.S. Geological Survey Box 25425, Federal Center Denver, CO 80225

Call (303) 236-7476 for ordering information

CONTENTS

ABSTRACT 1

INTRODUCTION 1

METHODS OF STUDY 8

Emplacement of sampling wells and piezometers 8Water levels 9Collection of sediment samples 9Laboratory analysis of sediment samples 9

HYDROGEOLOGIC DATA 15

REFERENCES CITED 43

ILLUSTRATIONS

Figures 1-3. Maps showing:

1. Location of study areas 2

2. Sampling wells, piezometers, andstaff gages at Dodge Ranch study area 3

3. Sampling wells at Harmon Lake study area 4

4. Hydrographs showing changes in water-level altitudesat selected wells at Dodge Ranch study area 10

5. Map showing water-level altitudes for September 11,1985, in wells at Dodge Ranch study area 12

6-29. Histograms of grain-size distribution of sediment from:

6. Well DR-AH-9, depth 3.5 feet 317. Well DR-AH-9, depth 6.0 feet 318. Well DR-AH-9, depth 12.5 feet 329. Well DR-AH-14A, depth 3.5 feet 32

10. Well DR-AH-14A, depth 9.0 feet 33

11. Well DR-AH-14A, depth 13.0 feet 3312. Well DR-AH-14A, depth 17.0 feet 3413. Well DR-AH-15A, depth 4.0 feet 3414. Well DR-AH-15A, depth 7.0 feet 3515. Well DR-AH-15A, depth 9.5 feet 35

^^^

Page

Figures 6-29. Continued



26. Well DR-AH-17A, depth 15.0 feet 4127. Well DR-AH-17A, depth 19.5 feet 4128. Well DR-AH-17A, depth 24.0 feet 4229. Well DR-AH-17A, depth 25.0 feet 42

TABLES

Table 1. Well locations, numbers, altitudes, and depths 5

2. Staff-gage locations and water-levelaltitudes at Dodge Ranch study area 7

3. Water-level altitudes in wells at Dodge Ranchstudy area 16

4. Water-level altitudes in wells at Harmon Lakestudy area 18

5. Lithologic logs of selected wells at Dodge Ranchstudy area 19

6. Total arsenic in sediment from wells at DodgeRanch study area 22

7. Total selenium in sediment from wells at DodgeRanch study area 25

8. Grain-size distribution of sediment from wells atDodge Ranch study area 26

^v

Table 9. Statistics of grain-size distribution of sediment from wells at Dodge Ranch study area

10. Porosity and hydraulic conductivity of sediment from wells at Dodge Ranch study area

11. Mineralogy of grain-size fraction greaterthan 2 micrometers in sediment from wells at Dodge Ranch study area -

12. Mineralogy of clay fraction (grain size less than 2 micrometers) in sediment from wells at Dodge Ranch study area -

Page

27

28

29

30

CONVERSION FACTORS AND ABBREVIATIONS

"Inch-pound" units of measure used in this report may be converted to International System (metric) units by using the following factors:

Multiply

AcresFeet (ft)Feet per day (ft/d)

Inches (in.) Miles (mi) Square miles

0.40470.30480.3048

25.401.6092.590

To obtain

Square hectometers (hm^)Meters (m)Meters per day (m/d)

Millimeters (mm)Kilometers (km)Square kilometers (km^)

To convert from the phi (<j>) size scale to the millimeter scale: size, in millimeters = io~4>/3 - 322

v

HYDROLOGIC, LITHOLOGIC, AND CHEMICAL DATA FOR SEDIMENT

IN THE SHALLOW ALLUVIAL AQUIFER AT TWO SITES

NEAR FALLON, CHURCHILL COUNTY, NEVADA, 1984-85

By Michael S. Lico, Alan H. Welch, and Jennifer L. Hughes

ABSTRACT

The U.S. Geological Survey collected an extensive amount of hydrogeologic data from the shallow alluvial aquifer at two study sites near Fallen, Nevada, from 1984 through 1985. These data were collected as part of a study to determine the geochemical controls on the mobility of arsenic and other trace elements in shallow ground-water systems. The main study area is approximately 7 miles south of Fallen. A subsidiary study area is about 8 miles east of Fallen. The data collected include lithologic logs and water-level altitudes for the augered sampling wells and piezometers, and determinations of arsenic and selenium content, grain size, porosity, hydraulic conductivity, and mineralogy for sediment samples from cores.

INTRODUCTION

The U.S. Geological Survey collected hydrologic, lithologic, and chemical data from the shallow alluvial aquifer near Fallen, Nev. (fig. 1) in 1984 and 1985. These data were collected as part of the national Toxic Waste Program of the U.S. Geological Survey. The purpose of this specific study is to ascertain the geochemical controls affecting the mobility of arsenic and other trace elements in a variety of geochemical environments. The data presented in this report are from a study of a shallow alluvial ground-water system. The bulk of the data were collected from an area approximately 7 miles south of the city of Fallen, Nev., designated as the Dodge Ranch study area (fig. 2). Other data were collected approximately 8 miles east of Fallen in the Harmon Lake study area (fig. 3). The Dodge Ranch study area consists of an array of 10 sampling wells, 22 piezometers (water-level monitoring wells), and 4 staff gages within an area of approximately 0.06 square mile. The staff gages are located in irrigation ditches and drains. The Harmon Lake study area consists of nine sampling wells within an area of approximately 0.5 square mile. The locations of wells, piezometers, and staff gages are shown in figures 2 and 3, and basic information regarding the sites is listed in tables 1 and 2.

-1-

118° 45' 118U 35'

39° 30'

39° 25

\_L*; <ô>-''" "-*P?'. I tr;

JTlfSS

- a \.' MATAL *tîllT*rV«II .'

1 ,^^^^^^ ::-''" M c--^; :S;:Sx, ! "Base from U. S. Geological Survey 1:62,500, Soda Lake, Fallen, Carson Lake, 1951; Stillwater 1950

NEVADA

3 MILES

FIGURE 1.--Location of study areas (crosshatched).

-2-

' 1\

5»&

\

rI

R OQ CT '" '^r\» £.v7« c. ----- - - -

DODGE LANE

»4 08 1

020 ° 18 14 o 01 ;° 21 A15 t

023 16 B|A17 B! 19 C >'eZ Oil >. O

(f 9 o22 * >.

o 24 ^

5o >

o7 o 13

o10 ) o12

2o o3 06 >

_ J^-==.=.^== = =Ê

>G-3

0 100 200 300 FEET L ____ I i }

: ".,--

SG-1

«̂

i-

EXPLANATION

DRAIN WELL

DITCH STAFF GAGE

SPILLWAY O PIEZOMETER

FIGURE 2.--LocatJons of sampling wells, piezometers, and staff gages at Dodge Ranch study area (SW^NM1̂ of section 6J. Numbers and letters next to well, piezometer, and staff-gage symbols are abbreviated forms of those listed in tables 1 and 2.

-3-

118° 38'R. 30 E.

39° 28'

Base from US. Geological Survey 1:62,500, Carson Lake, 1951 EXPLANATION

WELL

1/2

MILE

FIGURE 3.-Location of sampling wells at Harmon Lake study area. Numbers and letters next to well symbols are abbreviated forms of those listed in table 1.

TABLE 1. Well locationsj numbers, altitudes ., and depths

Location

WellLati tude

Longi tude Well number

DODGE

Land- surface

altitude (feet above sea level)

Well depth^ (feet)

Total depth

drilled (feet)

RANCH STUDY AREA

Sampling Wells

DR-AH-15ADR-AH-15BDR-AH-15CDR-AH-1 6ADR-AH-1 6B

DR-AH-16CDR-AH-1 7ADR-AH-1 7BDR-AH-1 7CDR-AH-1 7D

392208392208392208392208392208

392208392207392207392207392207

11846381184638118463811846421184642

11846421184646118464611846461184646

N17N17N17N17N17

N17N17N17N17N17

E29E29E29E29E29

E29E29E29E29E29

06BCA0706BCA0806BCA0906BCB0206BCB03

06BCB0406BCB0806BCB0906BCB1006BCB18

33333

33333

,932.,932.,932.,931.,931.

,931.,930.,930.,930.,930.

69767

77677

19.11.45.28.20.

9.26.19.9.

19.

73282

72982

19.711.361.529.020.2

9.745.019.99.8

19.2

Piezometers

DR-AH-1DR-AH-2DR-AH-3DR-AH-4DR-AH-5

DR-AH-6DR-AH-7DR-AH-8DR-AH-9DR-AH-1 0

DR-AH-11DR-AH-1 2DR-AH-1 3DR-AH-1 4ADR-AH-1 4B

DR-AH-1 8DR-AH-1 9DR-AH-2 0

392209392159392158392210392205

392158392203392210392207392201

392207392201392203392209392209

392209392207392209

11846341184634118464811846481184634

11846401184648118464211846361184645

11846451184637118464111846341184634

118463711846391184640

N17N17N17N17N17

N17N17N17N17N17

N17N17N17N17N17

N17N17N17

E29E29E29E29E29

E29E29E29E29E29

E29E29E29E29E29

E29E29E29

06BCA0106BCD0306BCC0206BCB1306BCA04

06BCD0106BCC0106BCB0106BCA0506BCC03

06BCB0706BCD0206BCC0406BCA0206BCA03

06BCA0606BCA1006BCA11

33333

33333

33333

333

,933.,932.,929.,930.,933.

,930.,929.,931.,932.,930.

,930.,931.,931.,933.,933.

,933.,932.,932.

24472

98641

98010

032

6.9.8.9.7.

11.11.7.

10.7.

10.9.

12.19.10.

9.9.8.

37896

03011

92363

884

6.39.78.89.97.6

11.011.37.013.07.1

10.99.212.319.610.3

9.89.88.4

-5-

TABLE 1. J/ell locations, numbers, altitudes, and depths Continued

Location

Well

DR-AH-22 DR-AH-23 DR-AH-24

Lati tude

392207 392208 392206

Longi

tude

1184644 1184648 1184647

Well

N17 N17 N17

E29 E29 E29

number

06BCB05 06BCB12 06BCB11

Land-surface

altitude (feet above sea level)

3,930.8 3,930.5 3,930.4

Well depth^ (feet)

9.9 9.8 9.5

Total depth

drilled (feet)

9.9 9.8 9.5

HARMON LAKE STUDY AREA

Sampling Wells

HL-AH-2HL-AH-2AHL-AH-3HL-AH-4HL-AH-5

HL-AH-5AHL-AH-6AHL-AH-6BHL-AH-7

392823392823392823392821392758

392758392828392828392811

11837071183707118362111836151183651

1183651118361211836121183637

N19N19N19N19N19

N19N19N19N19

E30E30E30E30E30

E30E30E30E30

33ABA0233ABA0134BAB0134BAD0133ADB02

33ADB0134BAA0134BAA0233ADD01

33333

3333

,917,917,917,915,915

,916,914,914,914

.4

.1

.3

.2

.9

.0

.2

.2

.8

18.29.21.12.13.

30.25.12.10.

19494

5288

19.030.023.017.013.4

30.525.214.630.0

* Completed well depth is bottom of screened interval, relative to land surface.

fi

TABLE 2. Staff-gage locations and water-level altitudes atDodge Ranch study area

[Altitudes are expressed in feet above 3,900 feet; " " indicates no data available]

Staff gage:Latitude:Longitude:

DR-SG-13922091184634

DR-SG-23922101184648

DR-SG-33921581184648

DR-SG-43921591184634

Date Water-level altitude

Aug. Aug. Aug. Aug. Aug.

17, 20, 22, 23, 24,

1984 1984 1984 1984 1984

32 32 32 32 32

.69

.55

.51

.50

.49

__ __

Aug. 27, 1984 32.48Aug. 29, 1984 32.87Aug. 31, 1984 32.93 Sept. 11, 1984 32.57 24.89 28.15 27.77Sept. 18, 1984 32.63 25.02 27.60 27.75

Oct. 25, 1984 32.37 25.06 - Oct. 30, 1984 - Nov. 20, 1984 32.56 25.00 27.81 27.60Dec. 12, 1984 32.43 24.94 27.01 27.36Apr. 8, 1985 25.40 28.55 -

Apr. 17, 1985 25.26 - May 1, 1985 32.73 25.34

-7-

The local well numbering system used in this report is based on the rectangular subdivision of the public lands referenced to the Mount Diablo base line and meridian. Each number consists of three units separated by spaces: The first unit is the township, preceded by an N or S to indicate location north or south of the base line. The second unit is the range, preceded by an E to indicate location east of the meridian. The third unit consists of the section number and letters designating the quarter section, quarter-quarter section, and so on (A, B, C, and D indicate the northeast, northwest, southwest, and southeast quarters, respectively), followed by a number indicating the sequence in which the well was recorded. For example, well N17 E29 06BCB06 is the sixth well recorded in NW| of the SWi of the NWi of section 6, Township 17 North, Range 29 East, Mount Diablo base line and meridian.

The site-naming system used in the tables and figures of this report indicates the study area, type of measuring point, and site number. The first segment of the designation indicates study area: DR for Dodge Ranch and HL for Harmon Lake. The second segment indicates the type of measuring site: AH for auger hole (sampling wells and piezometers) and SG for staff gage. The third segment indicates the site number within each study area.

The authors thank William Slentz and Ray Lannen of Island Ranch and Circle D Feeds for access to their property, as well as the U.S. Bureau of Reclamation and the Truckee-Carson Irrigation District for information on irrigation of the Fallen area. We also acknowledge Darrell K. Nordstrom and Ivan Barnes of the U.S. Geological Survey, Menlo Park, Calif., for use of their analytical facilities. Special thanks are extended to Patrick A. Glancy of the U.S. Geological Survey, Carson City, Nev., for his insight into the geochemistry and stratigraphy of the Fallen area.

METHODS OF STUDY

Emplacement of Sampling Wells and Piezometers

Sampling wells and piezometers in the Dodge Ranch and Harmon Lake study areas were drilled with either a 3-inch solid-stem auger or a 7-inch hollow-stem auger. No drilling fluids were used during drilling. The sampling wells and piezometers were logged by noting each change in lithology. Selected logs are listed in table 5. Wells and piezometers were cased with 2-inch inside-diameter polyvinyl chloride (PVC) pipe. Perforated intervals consisted of premanufactured machine-slit PVC well screens (0.006-inch slots). Washed Monterey sand was added to the annulus to cover the screened interval; then bentonite pellets were added to create a seal at least 1 foot thick. The remainder of the annular space was back filled with drill cuttings. A surface seal was emplaced with bentonite pellets. The wells and piezometers were capped and cement water-meter boxes were placed over the wells.

-8-

Water Levels

Water levels were periodically measured in the sampling wells and piezometers at the Dodge Ranch and Harmon Lake study areas. These data are tabulated in tables 3 and 4. Hydrographs showing the water-level variations with time in 10 representative wells at the Dodge Ranch area are presented in figure 4. Water levels for a representative date, September 11, 1985, are shown for the Dodge Ranch area in figure 5. Water-level data for the staff gages are listed in table 2.

Collection of Sediment Samples

Sediment samples were collected during the drilling. Cores were taken through the hollow-stem auger with a stainless-steel, split-spoon drive sampler fitted with a polycarbonate liner. The cores were removed from the sampler, capped, and the ends sealed with paraffin. All cores were kept refrigerated until analysis. In addition, bulk sediment samples were obtained as the auger brought the cuttings to land surface. These samples were placed into plastic containers and sealed.

Laboratory Analysis of Sediment Samples

Lithologic and chemical analyses made on the sediment samples from the Dodge Ranch study area included determinations of grain-size, porosity, hydraulic conductivity, total arsenic content, total selenium content, arsenic content of specific grain-size fractions, and arsenic content of specific grain types. Tables 6 through 10 list the results of these analyses.

Grain-size analysis was made on the unconsolidated sediment by standard dry and wet sieving methods (Folk, 1955, p. 33-40). The silt- and clay-sized fractions were analyzed by the pipette method of Folk (1955, p. 37-40).

Statistical data for the sieve analysis of sediments from the Dodge Ranch study area were calculated using methods outlined by Folk (1955, p. 42-53) and Pettijohn (1975, p. 39), and are presented in table 9. The grain-size distribution in sediment samples is shown in figures 6-29. To convert the grain sizes from the phi-size scale used in figures 6-29 to the millimeter scale, use the following table:

Phi size Millimeters Phi size Millimeters

-2-1

01234

4.002.001.00

.50

.25

.125

.0625

56789

10

0.0312.0156.0078.0039.0020.00098

-9-

Oo

OCD

40

35

25

I I I I I I I

20

I ccUJ

D DR-AH-9

J___I I

J A S 0 N D 1984

J F M A M 1985

J J A

UJ

o oenro

UJ> oCD

31

30

H 29

UJ Q

UJ> UJ

28

27

26

DR-AH-15A

DR-AH-15B

DR-AH-15C

J_____I

SON 1984

D J F M A M 1985

J J A

FIGURE 4.--Changes in water-level altitudes with time in selected wells at Dodge Ranch study area.

-10-

WA

TE

R-L

EV

EL

ALT

ITU

DE

, IN

FE

ET

AB

OV

E 3

90

0 F

EE

TW

AT

ER

-LE

VE

L. A

LTIT

UD

E,

IN F

EE

T A

BO

VE

3

90

0 F

EE

T

c DO

m I

CO

H)

__

00

O

LD

00 cn

o o

CO

CD

__ 00

O

LD oo cn

cn O

22.33

R. 29. E

DODGE LANE

26.44 27.91 o

25.58e

26.56 26.43| 26.45

026.19

27.70o

26.99

02735

28.91o

29.50o

29.011

27.67 128.52

29.44I2"3 * 29.76

o 28.94

29.8929.90

9 98 30.01-

29.64

o 25.99

26°71

21.86o

25.11

27°79

02857

027.24

o > 29.77

100 200 300 FEET

EXPLANATION

DRAIN WELL

DITCH STAFF GAGE

SPILLWAY o PIEZOMETER

FIGURE 5.--Water-level altitudes for September 11, 1985, in wells at Dodge Ranch study area. Values listed are in feet above 3,900 feet.

-12-

Samples for arsenic and selenium analysis were prepared by grinding the sediment to a fine powder and dissolving it in a mixture of hydro fluoric, hydrochloric, and perchloric acids to which nitric acid was added to maintain oxidizing conditions. Arsenic and selenium were then deter mined by hydride-generation atomic-absorption analysis (Skougstad and others, 1979, p. 61-63).

Porosity was determined using the resaturation method described by Amyx and others (1960, p. 39-57).

Hydraulic conductivity was determined using standard steady-state techniques incorporating the Darcy Law of homogeneous flow (Amyx and others, 1960, p. 71-83). Deionized water was used as the permeating fluid at ambient temperature. These data are listed in table 10.

The sediment from a few wells at the Dodge Ranch study area was analyzed for mineral content by x-ray diffraction analysis using a Picker^ diffractometer. Sediment samples were split into two size fractions (greater than 2 micrometers and less than 2 micrometers) by centrifugation, The two fractions were analyzed by the authors using standard x-ray diffraction techniques (Carroll, 1970, p. 51-61; Nuffield, 1966, p. 130-137). Results of the x-ray diffraction analyses are listed in tables 11 and 12.

^ The use of a trade name in this report is for identification purposes only and does not constitute endorsement by the U.S. Geological Survey.

-13-

l?

HYDROGEOLOGIC DATA

-15-

TABL

E 3. Water-level

altitudes

in we

lls

at Dodge

Ranch

stud

y area

[Values

are

expressed

in fe

et ab

ove

3,90

0 fe

ec; " " in

dica

tes

no data av

aila

ble]

Mea

sure

men

t d

ate

1 i

ON 1

Wel

l

DR

-AH

-1D

R-A

H-2

DR

-AH

-3D

R-A

H-4

DR

-AH

-5

DR

-AH

-6D

R-A

H-7

DR

-AH

-8D

R-A

H-9

DR

-AH

-10

DR

-AH

-11

DR

-AH

-1 2

DR

-AH

-1 3

DR

-AH

-14A

DR

-AH

-14B

DR

-AH

-15A

DR

-AH

-1 5B

DR

-AH

-1 5

CD

R-A

H-1

6AD

R-A

H-1

6B

DR

-AH

-16C

DR

-AH

-17A

DR

-AH

-17B

DR

-AH

-17C

DR

-AH

-1 7D

DR

-AH

-1 8

DR

-AH

-1 9

DR

-AH

-20

DR

-AH

-2 1

DR

-AH

-22

DR

-AH

-23

DR

-AH

-24

June

21

, 19

84

29.3

223

.99

23.7

226

.29

29.1

3

27.2

925

.91

27.4

529

.12

26.4

2

26.8

228

.32

27.2

9 _ _

Jun

e 29

, 19

84

28.8

024

.83

23.7

826

.00

28.6

0

27.0

926

.02

26.9

328

.84

25.9

5

26.5

227

.87

27.0

2 _ _

July

6

, 19

84

30.6

231

.91

24.2

926

.87

30.6

5

27.4

226

.71

28.1

631

.22

26.7

0

27.1

529

.19

28.2

0 _ _

July

20

, 19

84

31

.15

32.0

926

.28

26.9

330

.95

28.0

22

8.9

428

.90

31

.60

28.6

5

27.5

430

.09

29.5

6

July

26

, 19

84

30.3

723

.81

20.1

626

.51

29.7

9

27.3

720

.94

28.0

629

.70

26.8

6

27.0

328

.69

28.0

5 _

Aug

. 17

, 19

84

31.8

1

26.7

8

27.4

8

28.6

3

28.6

3

27.2

630

.16

28.8

431

.54

31.5

6

30.7

93

0.8

0

27.7

828

.24

28.1

126

.61

23.8

326

.17

.

Aug

. 20,

1984

30.4

931

.95

22.9

226

.49

30.3

5

27.1

726

.34

28.0

530

.13

26.7

7

26.9

728

.69

27.8

330

.31

30.3

2

29.7

929

.81

27.6

427

.91

28.6

726

.55

25.2

026

.25

Aug

. 22

, 19

84

30.2

131

.89

22.9

526

.42

30.0

4

27.1

126

.16

27.9

029

.85

26.6

3

26.8

728

.64

27.6

530

.11

30.1

2

29.5

829

.58

27.5

827

.77

28.5

226

.50

25.6

026

.23

Aug

. 23

, 19

84

30.1

131

.82

22.9

726

.38

29.9

3

27.0

626

.10

27.8

429

.77

26.5

8

-

28.5

927

.60

29.9

729

.99

29.4

729

.48

27.5

427

.48

28.4

726

.41

26.2

2

Aug

. 24

, 19

84

30.0

231

.77

21.2

426

.35

29.8

4

27.0

226

.07

27.8

129

.68

26.5

6

26.8

128

.54

27.5

529

.89

29.9

1

29.4

029

.41

28.4

1

Aug

. 27

, 19

84

29.6

831

.56

21.3

426

.12

29.4

9

26.8

425

.95

27.5

329

.35

26.3

1

26.6

728

.66

27.3

829

.56

29.5

8

29.0

929

.11

27.3

527

.47

28.2

026

.26

20.5

626

.16

Aug

. 29

, 19

84

^2

9.4

931

.43

21.3

826

.10

29.2

8

26.8

225

.79

27.3

629

.17

26.2

3

26.6

328

.10

27.2

529

.38

29.3

9

28.9

428

.96

27.2

5

28.0

626

.24

26.1

3

Aug

. 31

, 19

84

29.4

931

.32

21.4

826

.12

29.3

1

26.7

025

.88

27.3

229

.06

26.1

8

26.6

228

.04

27.1

729

.34

29.3

5

28.8

428

.85

27.2

227

.31

27.9

726

.29

TABL

E 3. Water-level

alti

tude

s in w

ells

at

Dodge* Ran

ch s

tudy area Continued

Measurement

date

Wel

l

DR

-AH

-1D

R-A

H-2

DR

-AH

-3D

R-A

H-4

DR

-AH

-5

DR

-AH

-6D

R-A

H-7

DR

-AH

-8D

R-A

H-9

DR

-AH

-10

DR

-AH

-1 1

DR

-AH

-1 2

DR

-AH

-1 3

DR

-AH

-1 4

AD

R-A

H-1

4B

DR

-AH

-15A

DR

-AH

-1 5

BD

R-A

H-1

50

DR

-AH

-1 6

AD

R-A

H-1

6B

DR

-AH

-1 6

0D

R-A

H-1

7 A

DR

-AH

-1 7

BD

R-A

H-1

7CD

R-A

H-1

7D

DR

-AH

-18

DR

-AH

-1 9

DR

-AH

-20

DR

-AH

-2 1

DR

-AH

-22

DR

-AH

-23

DR

-AH

-24

Sep

t.

11,

1984

30.0

131

.21

21.8

626

.44

29

.77

27

.24

25

.99

27

.91

29

.64

26

.71

26.9

928.5

72

7.7

929.8

92

9.9

0

29

.33

29.4

42

9.7

627

.67

27

.84

28

.52

26

.56

26

.43

26

.45

29.5

028

.94

28

.91

27.7

02

7.3

5

25.5

826.1

9

Sep

t.

13,

1984

29

.82

31.1

221.9

226.3

129.5

5

27.0

626.0

12

7.7

42

9.4

52

6.5

8

26.8

52

8.4

22

7.6

529.7

129.7

2

_ _2

6.4

424.9

126.3

62

6.3

3

28.4

027.5

427.2

3

25

.52

26

.10

Sep

t.

18,

1984

29.3

930.8

722.0

826.0

329.1

3

26.7

72

5.9

427.3

729.0

826.2

7

26.6

328.0

627.3

329.3

129.3

3

28.9

128.9

22

8.2

827.3

027.3

9

28

.07

26.2

62

6.2

226.2

526.1

8

29

.13

28.4

9 27.1

82

7.0

3

25

.42

25

.94

Oct

. 2

5,

Oct

. 3

0,

1984

19

84

28.6

1

26.0

1

28

.22

__

_

27

.08

28

.35

26.4

1

29

.55

28

.55

26

.77

28.6

5

27

.56

26.1

126.4

1

26

.12

26

.13

26

.04

28.4

0

27.8

8

27.8

0

26.9

3

26

.89

25

.44

25.8

6

Nov

. 2

0,

1984

29

.46

26

.30

29

.43

_

27

.51

24

.26

26.8

1

29.3

529.3

7

28

.90

28.9

12

8.3

22

7.3

82

7.4

8

28

.03

26

.49

26.4

72

6.4

426.3

2

29

.04

28.5

02

8.4

227.4

32

7.5

5

25

.60

26

.36

Dec

. 12

, 19

84

28.8

231.0

42

3.0

826.1

528.6

2

26.9

926

.31

27.2

428.6

226.6

3

26.5

528.0

527.5

628.7

428.7

5

28.4

12

8.4

12

8.1

02

7.1

02

7.1

8

27.7

12

6.2

326.2

22

6.2

826.6

8

28.5

42

8.0

527.9

72

7.1

627.1

6

25.4

425.9

7

Jan.

8,

1985

28.2

130.2

123.4

02

6.1

3

27

.83

26.4

125.6

627.0

227.9

82

6.2

4

26

.33

27

.39

27.0

12

8.1

72

8.1

9

27

.94

27

.95

27.8

82

6.8

42

6.8

8

26

.59

26.0

125.9

72

6.0

925.9

1

28

.08

27

.69

27

.59

26

.93

26

.83

25.7

62

5.7

2

Feb

. 27

, 19

85

27.4

3

25.9

32

6.9

2

26.6

9

26.0

2

27

.41

27.4

2

27

.34

27

.32

27

.54

26.4

22

6.4

4

26

.95

28.4

027.1

027.0

326.6

126.4

1

25.0

925.4

1

Apr.

8,

1985

26.9

928.3

92

4.1

525.7

126

.51

26.2

225.2

626.4

626.8

025.6

2

25

.88

26.2

426.1

026.9

82

6.9

9

26.9

226.9

32

7.4

026.2

026.2

2

26.6

825.5

625

.61

25.7

425.5

9

27.0

12

6.7

526.7

22

6.3

426.1

6

25

.14

25.3

0

Ap

r.

17,

1985

^.^ _

27.1

0

28

.51

28

.47

27.8

02

6.3

126.3

0

27

.56

25

.97

25

.71

25

.84

25

.68

_

May

1,

19

85

29.3

2

26

.41 __

27

.61

29.1

5

26

.81

29.2

62

8.2

6

28.9

22

8.9

228.1

227.3

32

7.4

8

28

.08

26.4

526.4

52

6.4

12

6.4

0

29.0

728.4

828.4

62

7.5

12

7.1

6

25

.67

26

.20

Aug

. 19

, 19

85

^.^ _

29.2

4

29.0

229.0

828.2

927.3

52

7.3

9

28.0

326.3

6

25.9

826.3

4

_

TABLE 4. Voter-level altitudes in wells at Harmon Lake study area

[Values are expressed in feet above 3,900 feet; " " indicates no data available]

Measurement date

July 17, Aug. 9, Aug. 15, Aug. 16, Aug. 20, Aug. 21, Aug. 24, Aug. 30, Well 1984 1984 1984 1984 1984 1984 1984 1984

HL-AH-2 HL-AH-2A HL-AH-3 HL-AH-4 HL-AH-5

HL-AH-5A HL-AH-6A HL-AH-6B HL-AH-7

6.90

7.42 7.34

Feb. 25, 1985

HL-AH-2 HL-1H-2AHL-fH-3HL-AH-4HL-AH-5

HL-AH-5AHL-AH-6AHL-AH-6BHL-AH-7

8.46 8.277.61

8.15

9.096.186.207.14

6.45

Feb. 26, 1985

8.47 7.487.55 8.09

9.086.196.247.16

7.49 8.46 7.25 6.91 8.66

10.06 6.61 6.03 7.61

Feb. 27, 1985

7.577.868.13

9.046.186.187.14

7.61 7 8.45 8 7.24 7 6.90 6 8.62 8

9.95 9 6.60 6 6.64 6 7.60 7

Apr. 10, 1985

8.60 6.467.707.358.18

8.166.266.297.23

.86 7

.44 8

.22 7

.83 6

.60 8

.80 9

.60 6

.65 6

.58 7

May 1, 1985

8.58 6.897.757.388.22

8.206.326.367.26

.90

.45

.21 7.23 7.23

.83 6.90 6.84

.60 8.60 8.59

.78 8.60 8.58

.59 6.61 6.61

.61 6.64 6.65

.58 7.57 7.55

June 25, 1985

8.21 7.146.926.108.23

8.186.306.289.53

Oct. 28, 1985

9.82 7.407.146.917.86

7.885.965.976.92

-18-

TABLE 5. Lithologio logs of selected wells at the Dodge Ranch study area*

Thickness Depth Material (feet) (feet)

WELL DR-AH-9:

Sand, very-fine-grained, silty, dark yellowish brown (10YR4/2), well-sorted, sub-rounded, quartz-rich, 5 percent muscovite 4.0 4.0

Sand, very-fine-grained, silty, dark yellowish brown(10YR4/2), well-sorted, rounded, quartz-rich 2.5 6.5

Sand, very-fine-grained, silty, dark yellowish brown (10YR4/2), well-sorted, rounded, quartz-rich, 1 percent muscovite 6.5 13.0

WELL DR-AH-14A:

Sand, very-fine- to medium-grained, dark yellowish brown(10YR4/2), quartz-rich, clay pods up to 0.5 inch 5.0 5.0

Sand, very-fine- to fine-grained, dark yellowish brown(10YR4/2), quartz-rich 5.0 10.0

Sand, fine-grained, dark yellowish brown (10YR4/2),moderately well-sorted, well-rounded, quartz-rich 3.0 13.0

Sand, fine-grained, dark yellowish brown (10YR4/2), moderately well-sorted, well-rounded, quartz-rich, 1 percent muscovite 4.0 17.0

Clay, dark yellowish brown (10YR4/2) 2.6 19.6

WELL DR-AH-15C:

Sand, fine-grained, dark yellowish brown (10YR4/2),poorly sorted, quartz-rich 5.0 5.0

Sand, very-fine- to fine-grained, dark yellowish brown(10YR4/2), quartz-rich 5.0 10.0

Sand, fine-grained, dark yellowish brown (10YR4/2),well sorted, quartz-rich 5.0 15.0

Sand, fine- to medium-grained, dark yellowish brown(10YR4/2), quartz-rich 5.0 20.0

-19-

TABLE 5. Lithologic logs of selected wells at the Dodge Ranch study area-* Continued


WELL DR-AH-15C (continued):

Clay, sandy, dark yellowish brown (10YR4/2) 13.0 33.0

Clay, black (Nl), stiff, minor sand lenses, sulfurous odor 28.5 61.5

WELL DR-AH-16A:

Sand, fine- to very-coarse-grained, dark yellowish brown (10YR4/2), poorly sorted, sub-rounded, quartz-rich, minor clay pods 3.0 3.0

Sand, very-coarse-grained, dark yellowish brown(10YR4/2), poorly sorted, sub-angular, quartz-rich 6.0 9.0

Sand, fine- to coarse-grained, silty, dark yellowish brown(10YR4/2), quartz-rich 8.0 17.0

Clay, dark yellowish brown (10YR4/2), silty 2.0 19.0


Clay, silty, dark yellowish brown .(10YR4/2) 1.0 26.0


Clay, light olive-gray (5Y5/2) 2.0 29.0

WELL DR-AH-17A:

Sand, fine- to medium-grained, dark yellowish brown(10YR4/2), quartz-rich, minor clay pods 4.5 4.5

Clay, silty, dark yellowish brown (10YR4/2) 3.5 8.0

Sand, fine- to very-coarse-grained, dark yellowish brown(10YR4/2), sub-rounded, quartz-rich, some clay pods 7.0 15.0

Sand, fine-grained, dark yellowish brown (10YR4/2), wellsorted, sub-rounded, quartz-rich, silty in places 10.0 25.0

-20-

TABLE 5. Lithologic logs of selected wells at the Dodge Ranch study area* Continued


WELL DR-AH-17A (continued):

Sand, very-fine- to fine-grained, dark yellowish brown(10YR4/2), sub- rounded to rounded, quartz-rich 2.0 27.0

Clay, light olive-gray (5Y5/2) 18.0 45.0

^ Colors are for undried samples and are based on Rock-Color Chart (Munsell System) distributed by Geological Society of America.

-21-

TABLE 6. Total arsenic in sediment from wells at Dodge Ranch study area

Well



DR-AH-1 0DR-AH-1 2DR-AH-1 4ADR-AH-1 4ADR-AH-1 5A

DR-AH-1 5ADR-AH-1 5ADR-AH-1 5ADR-AH-1 5ADR-AH-1 5A

DR-AH-1 5ADR-AH-1 5ADR-AH-1 5ADR-AH-1 5CDR-AH-1 5C

DR-AH-1 5CDR-AH-1 5CDR-AH-1 5CDR-AH-1 5CDR-AH-1 5C

DR-AH-1 5CDR-AH-1 5CDR-AH-1 5CDR-AH-1 5CDR-AH-1 5C

Depth (feet)

7.04.07.09.07.0

10.04.03.04.013.0

7.510.0

3.5-4.09.0-9.58.5-10

8.5-108.5-1019.5-2019.5-2019.5-20

19.5-2019.5-2019.5-20

4-54-5

4-54-54-54-54-5

2125.5-26.5

50-50.550-50.550-50.5

Size fraction (millimeters)

Whole rockWhole rockWhole rockWhole rockWhole rock

Whole rockWhole rockWhole rockWhole rockWhole rock

Whole rockWhole rock

< 0.0625< 0.0625

0.25-0.125

0.125-0.0625< 0.0625

2.00-1.001.00-0.500.50-0.25

0.25-0.1250.125-0.0625

< 0.06252.00-1.001.00-0.50

0.50-0.250.25-0.125

0.125-0.0625< 0.0625

Whole rock

Whole rockWhole rock0.25-0.1250.125-0.0625

< 0.0625

Total arsenic

(milligrams per kilogram

as As)-*

410676

104

1768

68

13116.0

7.011144.05.0

3.81014127.0

5.06.06.4

104.4

16168.48.07.0

Sediment description

J_u _^

.

.

Fine silty sand

Brown claySandy brown clay

-22-

TABLE 6. Total arsenic in sediment from wells at Dodge Ranchstudy area Continued

Well

DR-AH-15CDR-AH-1 5CDR-AH-1 6ADR-AH-1 6ADR-AH-1 6A

DR-AH-1 6ADR-AH-1 6ADR-AH-1 6ADR-AH-1 6ADR-AH-1 6 A

DR-AH-1 6ADR-AH-1 6 ADR-AH-1 6ADR-AH-1 6ADR-AH-1 6A


DR-AH-1 6 ADR-AH-1 6ADR-AH-1 6ADR-AH-1 6ADR-AH-1 6A


DR-AH-1 6ADR-AH-1 7ADR-AH-1 7ADR-AH-1 7 ADR-AH-1 7A

Depth (feet)

50-50.560-60.5

4.5-5.09.5-109.5-10

9.5-109.5-109.5-109.5-10

19.5-20

19.5-2019.5-2019.5-2019.5-2019.5-20

19.5-2019.5-2019.5-2019.5-2019.5-20

19.5-2019.5-2019.5-2019.5-2019.5-20

29.5-3029.5-3029.5-3029.5-3029.5-30

29.5-309-109-109-109-10


Whole rockWhole rock

< 0.06252.00-1.001.00-0.50

0.50-0.250.25-0.125

0.125-0.0625< 0.0625

1.00-0.71

1.00-0.711.00-0.711.00-0.711.00-0;,711.00-0.71

2.00-1.002.00-1.002.00-1.002.00-1.002.00-1.00

1.00-0.500.50-0.250.25-0.1250.125-0.0625

< 0.0625

2.00-1.001.00-0.500.50-0.250.25-0.125

0.125-0.0625

< 0.06250.25-0.125

0.125-0.0625< 0.0625

Whole rock

Total arsenic

(milligrams per kilogram

as As)^

6.4259.1

144.4

4.08.0

121730

5.11731322.2

0.736280.49.0

3.64.65.6

1019

136.44.05.0

12

1418191518


Black clayBlack clay

.

Red-stained lithicfragments

FeldsparStained feldsparDark lithic fragmentsLight lithic fragmentsClear quartz

FeldsparDark lithic fragmentsLight lithic fragmentsClear quartz

Fine clayey sand

-23-

TABLE 6. Total arsenic in sediment from wells at Dodge Ranchstudy area Continued

Totalarsenic

(milligrams

Well

DR-AH-17ADR-AH-17ADR-AH-17ADR-AH-17ADR-AH-17A

DR-AH-17ADR-AH-17ADR-AH-17ADR-AH-17ADR-AH-17A

Depth (feet)

19.5-2019.5-2019.5-2019.5-2019.5-20

28-2928-2928-2928-29

45.5-46.5


1.00-0.500.50-0.250.25-0.1250.125-0.0625

< 0.0625

0.25-0.1250.125-0.0625

< 0.0625Whole rockWhole rock

per kilogram as As) -^

16189.0

1120

141213167.5


__

Silty sandLight olive-gray clay

1 Analysts: wells DR-AH-1 through 12, U.S. Geological Survey Central Laboratory, Arvada, Colo.; all other wells, Terra-Tek Core Services, Salt Lake City, Utah.

-24-

TABLE 7. Total selenium in sediment from wells at Dodge Ranch study area*

Well

DR-AH-14ADR-AH-14ADR-AH-15ADR-AH-15ADR-AH-15C

DR-AH-15CDR-AH-16ADR-AH-16ADR-AH-16ADR-AH-16A

DR-AH-17ADR-AH-17ADR-AH-17A

Depth(feet)

3.5-4.09.0-9.59.5-10.019.5-20.025.5-26.5

60.0-60.54.5-5.09.5-10.019.5-20.029.5-30.0

19.5-20.028.0-29.045.5-46.5

Size fraction(millimeters)

< 0.0625< 0.0625< 0.0625< 0.0625

Whole rock

Whole rock< 0.0625< 0.0625< 0.0625< 0.0625

< 0.0625Whole rockWhole rock

Selenium(milligrams

perkilogram)

0.03.06.04.03.07

.02

.30< .02< .03

.13

.10

.06

.08

^ Analyst: City, Utah.

Terra-Tek Core Services, Salt Lake

-25-

TABL

E 8. Gr

ain-

size

dis

trib

utio

n of

sediment fr

om wells a

t Do

dge

Ranch

stud

y area

10

Perc

ent,

by

w

eig

ht,

in

ea

ch m

illi

mete

r

Wel

l

'DR

-AH

-9D

R-A

H-9

DR

-AH

-9

DR

-AH

-14A

DR

-AH

-1 4

A

DR

-AH

-1 4

AD

R-A

H-1

4AD

R-A

H-1

5AD

R-A

H-1

5C

DR

-AH

-1 5

A

DR

-AH

-1 5

AD

R-A

H-1

5AD

R-A

H-1

5A

DR

-AH

-1 6

AD

R-A

H-1

6A

DR

-AH

-1 6

AD

R-A

H-1

6A

DR

-AH

-1 6

AD

R-A

H-1

7 A

DR

-AH

-1 7

A

DR

-AH

-1 7

AD

R-A

H-1

7A

DR

-AH

-1 7

AD

R-A

H-1

7A

DR

-AH

-1 7

A

Dep

th

(feet)

3.5

6.0

12

.53.5

9.0

13

.017.0

4.0

4.5

7.0

9.5

14

.019

.54.5

9.5

19.5

26.5

29

.54.0

8.0

14.5

15.0

19.5

24.0

25.0

>2.

00

0.0

5.1

2.0

8.2

2.0

0

.00

.00

.17

.00

.63

.14

.00

4.0

81.

174.

01

2.5

0.2

01.

84 .64

2.9

5

.00

.16

.00

.00

.00

2.0

0-

1.00 0.11 .1

5.1

21.

39 .00

.18

.22

.41

.76

.78

.05

.07

10.1

69.

059.

44

11.7

7.2

36.

611.

638.

41 .00

.58

.04

.43

.18

1.0

0-

0.5

0

0.4

9.3

5.4

27.

51 .03

.28

.91

1.94

8.0

32.0

2

.04

.36

21

.78

28.4

724

.81

31

.82

.63

24.8

64.3

611

.11

.00

1.57 .4

41.

76 .87

0.5

0-

0.25 2.9

54.

012.8

818

.50

.41

4.4

86.

139.5

02

0.2

08.

84

2.62

2.4

439

.61

32.6

835

.67

33.9

62.

5536

.29

7.27

15.7

1

.00

8.32

2.2

06.

433.8

6

0.2

5-

0.1

25

24.1

24

3.5

92

3.2

83

5.9

925

.72

44.5

440

.81

25.9

93

6.1

42

3.6

8

59.8

846

.22

17.2

018

.07

19.0

5

14.7

013

.24

18.1

312

.52

23.4

6

0.0

045

.81

44.3

341

.22

31

.03

0.1

25

- 0.0

625

16.0

22

5.5

229

.66

24.4

75

4.3

0

24

.93

25.3

49.

472

2.2

515

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32

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26.8

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047.

314.9

7

3.53

14.7

87.5

010

.63

13.8

2

3.6

72

0.8

544.0

52

0.4

33

2.9

6

<0.

0625

55.3

526

.25

43.5

711

.92

19.5

5

25.5

42

6.5

952

.51

12.6

148

.65

5.0

92

4.0

82.

613.

242

.00

1.72

68.3

74.7

86

2.9

624

.53

96.3

32

2.6

88.9

529

.72

31.0

8

0.0

62

5-

0.03

1

24.4

49.

3117

.87

12.0

612

.62

14.9

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17.8

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8 __ 9.9

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4.33

7.8

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6.8

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078

8.2

73.6

97.2

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93.3

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17.6

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.09

TABLE 9. Statistics of grain-size distribution of sediment from veils at Dodge Ranch atvdy area

Well and depth

Statistical parameter-'

Median: phimm

Mode: phimm

Standarddeviation

Coefficientof sorting

Phi quartiledeviation

Phi deviationmeasure

Inclusiveskewnesa

Coefficientof skewness

Phi quartileskewness

Phi skewnessmeasure

GraphicKurtosis

Kelley'squartilekurtosis

Phi quartilekurtosis

Phi kurtosismeasure

DR-AH-14A 3.5-4 ft

2.650.159

2.750.149

1.103

0.617

0.700

1.100

-0.048

1.040

-0.050

-2.568

1.069

0.209

0.230

0.659

DR-AH-14A 9-9.5 ft

3.300.102

2.750.149

0.666

0.769

0.375

0.620

0.451

0.943

0.075

-4.315

1.284

0.266

0.221

0.895

DR-AH-15A 8.5-10 ft

. 2.870.137

2.750.149

0.476

0.846

0.245

0.415

0.281

0.975

0.035

-6.205

1.480

0.221

0.208

1.133

DR-AH-15A 19.5-20 ft

1.400.379

1.750.297

1.199

0.615

0.700

1.125

-0.104

1.034

-0.050

-1.422

1.230

0.183

0.230

0.867

DR-AH-16A 4.5-5 ft

1.380.384

0.750.595

1.184

0.594

0.750

1.140

0.095

0.986

0.020

-0.996

1.107

0.235

0.248

0.776

DR-AH-16A 9.5-10 ft

1.350.392

1.750.297

1.209

0.574

0.800

1.175

-0.048

1.000

0.000

-1.277

1.050

0.219

0.262

0.745

DR-AH-16A 19.5-20 ft

1.150.451

0.750.595

1.098

0.609

0.715

1.075

0.002

1.009

-0.015

-1.023

1.060

0.231

0.255

0.721

DR-AH-16A 29.5-30 ft

1.450.366

1.250.420

1.214

0.601

0.735

1.125

0.137

0.955

0.130

-0.978

1.199

0.229

0.239

0.911

DR-AH-17A 19.5-20 ft

3.080.118

2.750.149

0.566

0.824

0.280

0.445

0.311

0.957

0.070

-6.169

1.661

0.218

0.206

1.551

1 Statistical parameters are defined as follows (Folk, 1955, p. 42-53; Pettijohn, 1975, p. 39; variables used in equations below are: Pn - nth percentile; Qn - ntH quartile):

Median: Md - P50

Mode: Mo » midpoint of most abundant class

Standard deviation: Sigma (I) - (lP84U)-P16U)]/4)+([P95U)-P5U)]/6.6)

Coefficient of sorting: So »/.J(Q3/qi)

Phi quartile deviation: Sigma (*) - 0.5[Q3(,>)-Q1(*) 1

Phi deviation measure: Sigma U) - 0.5[P84(*)-P16(*>]

Inclusive skewness: Sk (I) - ([P16U)+P84(»)-2P50(»)]/2[P84(»)-P16(») ])+( [P5(»)+P95U)-2P50(»)]/2[P95(»)-P5(»)])

Coefficient of skewness: Sk -^l(Ql)(Q3)/Md]

Phi quartile skewness: Sk(*) - 0.5[(Ql(*)+Q3(*))-2Md(*)]

Phi Skewness meaaure: a(2*) - [0.5(P5($)+P95(*))-2Md(*)]/Sigma(»

Graphic Kurtosis: Kg - [P95(*)-P5(*)]/2.44[P75(*)-P25(*)]

Kelley's quartile kurtosis: K - (Q3-Q1)/2(P90-P10)

Phi quartile kurtosis: K (*) - [Q3(*)-Q1(*)]/2[P90(*)-P10(*)]

Phi kurtosis measure: Beta (*) - (0.5(P95(*)-P5(*))-Sigma(*)]/Sigma(*)

-27-

TABLE 10. Porosity and hydraulic conductivity of sediment from wells at Dodge Ranch study area 1

Hydraulic conductivity

Well

DR-AH-14A DR-AH-14A DR-AH-14A DR-AH-15A

DR-AH-15A DR-AH-15A DR-AH-16A DR-AH-16A

DR-AH-16A DR-AH-16A DR-AH-17A

Depth (feet)

3.5-4.0 9.0-9.5 19.5-20 4.0-4.5

9.5-10 19.5-20 4.5-5.0 9.5-10

19.5-20 29.5-30 19.5-20

Porosity (percent)

44.8 41.3 53.0 22.6

22.4 32.6 30.3 23.7

30.6 29.8 26.3

(feet per day)

1.02 X 10~3 2.50 X 10~5 3.62 X 10~3 1.29 X 10~4

6.16 X 10~4 7.33 X 10~3 1.80 X 10~2 1.77 X 10~3

1.49 X ID"2 4.78 X 10~3 2.74 X 10~6

* Analyst: Terra-Tek Core Services, Salt Lake City, Utah

-28-

TABLE 11. Mineralogy of grain-size fraction greater than 2 micrometers in sediment from wells at Dodge Ranch study area*

Depth Well (feet) Minerals present Minerals possibly present

DR-AH-14A 4.0 Quartz, orthoclase, albite, Muscovite, biotite, augite,anorthite hematite, dolomite

DR-AH-14A 9.5 Quartz, orthoclase, Biotite, tremolite, enstatitemicrocline, albite, anorthite, hornblende, hypersthene

DR-AH-14A 20.0 Quartz, orthoclase, albite, Anorthite, muscovite,microcline, hypersthene arsenopyrite, dolomite

DR-AH-15A 4.5 Quartz, orthoclase, albite, Biotite, hornblende, augite,anorthite, muscovite, dolomite hypersthene, actinolite

DR-AH-15A 10.0 Quartz, orthoclase, albite, Hornblende, actinolite,microcline, anorthite, enstatite, diopside, muscovite hypersthene, calcite,

dolomite

DR-AH-15A 20.0 Quartz, albite, anorthite, Orthoclase, microcline,muscovite, augite, biotite, actinolite,hypersthene arsenopyrite, dolomite

DR-AH-16A 5.0 Quartz, orthoclase, Albite, augiteanorthite, muscovite, biotite, tremolite

DR-AH-16A 10.0 Quartz, orthoclase, albite, Microcline, muscovite,anorthite, biotite actinolite, diopside,

hematite, dimorphite II

DR-AH-16A 20.0 Quartz Orthoclase, microcline,albite, anorthite, hypersthene, gypsum

DR-AH-16A 30.0 Quartz, microcline, albite, Orthoclase, muscovite,anorthite, hematite, biotite, augite, diopside gypsum

DR-AH-17A 20.0 Quartz, orthoclase, Microcline, albite, biotite,anorthite, muscovite hypersthene, gypsum

* X-ray diffraction analysis.

29

TABLE 12. Mineralogy of clay fraction (grain size less than 2 micrometers) in sediment from wells at Dodge Ranch study area*

Depth Well (feet)

DR-AH-14A 4.0

DR-AH-14A 9.5

DR-AH-14A 20.0

DR-AH-15A 4.5

Minerals present ̂ Minerals possibly present

Montmorillonite, illite, chlorite, I-M

Montmorillonite, illite, Halloysite chlorite

Montmorillonite, illite, chlorite

Chlorite Montmorillonite, illite,

DR-AH-15A 10.0

DR-AH-15A 20.0

DR-AH-16A 5.0

DR-AH-16A 10.0

DR-AH-16A 20.0

DR-AH-16A 30.0

DR-AH-17A 20.0

Montmorillonite, illite


Montmorillonite, M-CH

Montmorillonite, illite, I-M


dickite

Halloysite, dickite

Dickite

Illite, attapulgite

Chlorite

Dickite

Montmorillonite, chlorite Illite, attapulgite

Montmorillonite, illite, chlorite, I-M

1 X-ray diffraction analysis.

^ Abbreviations: I-M, mixed-layer illite-montmorillonite; M-CH, mixed- layer montmorillonite-chlorite.

-30-

30

25

5 20

Ul

CQ 15

O10

I T r I r r r T i r

12345

GRAIN SIZE, IN PHI UNITS8 10

FIGURE 6.--Grain-size distribution of sediment from well DR-AH-9, depth 3.5 feet.

12345

GRAIN SIZE, IN PHI UNITS


-31-

Xo

>-CO

25

20

Z 1bUJOorLJQ- JO

-3 -2 -1 12345



-2 -1 0123


10

FIGURE 9.--Grain-size distribution of sediment from well DR-AH-14A, depth 3.5 feet.

-32-

40

35

30f IoUJ 25

CD 20

UJO 15

LJ Q.

10

n \ 7 0123

GRAIN SIZE, IN PHI UNITS-3 -2


50

45

40

35

30

OUJ

CO 25

2 20Oo:

15

10

-3 -2 12345

GRAIN SIZE, IN PHI UNITS10

FIGURE 11.--Grain-size distribution of sediment from well DR AH 14A, depth 13.0 feet.

-33-

o

>-CO

LJ O

45

40

30

25

20

10

I I I-3 -2 -1 0 12345


i i 6 7 8 10


O Ul

30

25

20

CO 15

zUl O

10

i r

i i r i i i 234567 8 JO


FIGURE 13.-Grain-size distribution of sediment from well DR-AH-15A, depth 4.0 feet.

-34-

o

30

25

20

CO 15

LJ CJ

10

I I I I I I

012345673


FIGURE 14.--Grain-size distribution of sediment from well DR AH-15A, depth 7.0 feet.

10

55

50

45

40

30

25

20

15

10

5

X

LJ

£>- CQh-~ z.LJ

C£LJ

-3 -2 0123


FIGURE 15.--Grain-size distribution of sediment from well DR AH 15A, depth 9.5 feet.

-35-

PE

RC

EN

T, B

Y W

EIG

HT

PE

RC

EN

T, B

Y W

EIG

HT

lu ON

I

Xo

>-CO

oCeLJ Q_

-2 0123GRAIN SIZE, IN PHI UNITS


-i 0123



-37-

o

012345



2345GRAIN SIZE, IN PHI UNITS


-38-

25

20

XoLJ

£>- CD

LJ 10OQ:LJ CL

-3-2-10 ! 2 3 4 5


FIGURE 22.--Grain-size distribution of sediment from well DR AH-16A, depth 29.5 feet.

-3 -2 I 2 3 4 5


FIGURE 23.-Grain-size distribution of sediment from well DR AH-17A, depth 4.0 feet.

-39-

o

30

25

20

CO 15

UJU

I I I T

-3 -2 -1 12345GRAIN SIZE, IN PHI UNITS

10


45

40

35

30

25

20

10

O

>- CD

ZUJU



-40-

PE

RC

EN

T,

BY

WE

IGH

TP

ER

CE

NT

, B

Y W

EIG

HT



40

35

30I Io

25

00 20

UJO 15

LJQ.

10


10


-42-

REFERENCES CITED

Amyx, J. W., Bass, B. M., and Whiting, R. L., 1960, Petroleum reservoir engineering: New York, McGraw Hill, 610 p.

Carroll, Dorothy, 1970, Clay minerals: A guide to their X-rayidentification: Geological Society of America Special Paper 126, 80 p.

Folk, R. L., 1955, Petrology of sedimentary rocks: Austin, University of Texas Press, 182 p.

Nuffield, E. W., 1966, X-ray diffraction methods: New York, John Wiley, 409 p.

Pettijohn, F. J., 1975, Sedimentary rocks (3rd ed.): New York, Harper and Row, 628 p.

Skougstad, M. W., Fishman, M. J., Friedman, L. C., Erdmann, D. E., andDuncan, S. S., eds., 1979, Methods for the determination of inorganic substances in water and fluvial sediments: U.S. Geological Survey Techniques of Water-Resources Investigations, Book 5, Chap. Al, 626 p,

-43-

Documents

Hydrologic, Lithologic, and Chemical Data For Sediment in ... · Hydrologic, Lithologic, and Chemical Data For Sediment in the Shallow Alluvial Aquifer at Two Sites near Fallon, Churchill