INVESTIGATIONS.pdf

PDF 7 MB Posted Sep 20, 2022

Attached to: MT-FRESNO SAFETY OF DAMS
Solicitation number: 140R6022R0006
Issued by: Department of the Interior Bureau of Reclamation

About this file

Written by GovTribe AI · Dec 27, 2023

This federal solicitation seeks proposals for dam modifications at Fresno Dam and Reservoir in Montana. The Bureau of Reclamation intends to award a firm fixed-price contract for safety improvements to address seepage and stability issues. Offerors must have experience designing and constructing embankment dams. Proposals are due by February 2023 and the agency will award the contract by April 2023. The period of performance is 24 months.

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Other files

File	Type	Posted
Sol_140R6022R0006_Amd_0004.pdf	PDF	Nov 22, 2022
Amendment_0004_0004.pdf	PDF	Nov 22, 2022
Sol_140R6022R0006_Amd_0003.pdf	PDF	Nov 17, 2022
Amendment_3_0003.pdf	PDF	Nov 17, 2022
Amendment_2_0002.pdf	PDF	Nov 9, 2022
Sol_140R6022R0006_Amd_0002.pdf	PDF	Nov 9, 2022
Sol_140R6022R0006_Amd_0001.pdf	PDF	Oct 28, 2022
Amendment_0001_V2_0001.pdf	PDF	Oct 28, 2022
Drawings.pdf	PDF	Sep 20, 2022
Photographs.pdf	PDF	Sep 20, 2022
Sol_140R6022R0006.pdf	PDF	Sep 20, 2022
Lab_test.pdf	PDF	Sep 20, 2022
SOL.pdf	PDF	Sep 20, 2022

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P P P P P P P P P P P P P P P

0 100' 200'

SHEET

B U

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A R

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C A D

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GEOLOGY

PLAN

BILLINGS, MT

15-600-60051

B B'

B'B

A A'

DESIGNED

DRAWN

CHECKED

TECH. APPR.

APPROVED

ADMIN APPROVAL -

Joramo, Seth M

Walsh, Christie S

Lasater, Jacob A

Joramo, Seth M

Clark, Cody T

Supervisory Geologist

W.L. 2522.32020-01-22 W.L.

2020-05-25 2514.1

0 100'50'

(Qtn)

SHEET

B U

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F R

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A R

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A ut oC A D

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D A M

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GEOLOGY

GEOLOGIC EXPLANATION

BILLINGS, MT

15-600-60052

DESIGNED

DRAWN

CHECKED

TECH. APPR.

APPROVED

ADMIN APPROVAL -

Joramo, Seth M

Walsh, Christie S

Lasater, Jacob A

Joramo, Seth M

Clark, Cody T

2020-06-02 2529.6

W.L.

2020-06-022517.6

2020-06-022523.4

W.L.

2020-06-02 2543.8

W.L.

2020-06-022529.0

2020-06-02 2573.8

RESERVOIR

W.L.

W.L.2544.7 2020-06-02

PR-90-1A W.L.

SHEET

B U

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A R

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C A D

A ut oC A D

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C A D

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D A M

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GEOLOGY

SECTION A-A'

BILLINGS, MT

15-600-60053

2022-02-07

HORIZONTAL SCALE

VERTICAL SCALE

20'10'0 40'

0 80' 160'40'

DESIGNED

DRAWN

CHECKED

TECH. APPR.

APPROVED

ADMIN APPROVAL -

Joramo, Seth M

Walsh, Christie S

Lasater, Jacob A

Joramo, Seth M

Clark, Cody T

2020-06-02 2518.99

W.L.

2020-06-02 2527.8

W.L.

2020-06-022518.88 W.L.

2020-06-022521.1 W.L.

2020-06-022522.0

W.L.

2020-06-02 2524.0

W.L.

2020-06-022541.42

W.L.

2020-06-02 2541.92

2020-06-02 2573.8

RESERVOIR

W.L.

0 100'50'

(Qtn)

0 100'50'

(Qtn)

0 100'50'

(Qtn)

0 100'50'

(Qtn)

W.L.

2020-06-022515.8

0 80' 160'40'

SHEET

B U

U O

F R

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A R

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C A D

A ut oC A D

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C A D

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GEOLOGY

SECTION B-B'

BILLINGS, MT

15-600-60054

2022-02-07

HORIZONTAL SCALE

VERTICAL SCALE

20'10'0 40'

DESIGNED

DRAWN

CHECKED

TECH. APPR.

APPROVED

ADMIN APPROVAL -

Joramo, Seth M

Walsh, Christie S

Lasater, Jacob A

Joramo, Seth M

Clark, Cody T

2020-06-02 2523.3W.L.

2020-06-022522.4 W.L.

2020-06-02 2522.9

SHEET

B U

U O

F R

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A R

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A ut oC A D

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C A D

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GEOLOGY

SECTION B-B' CALL OUT

AREA

BILLINGS, MT

15-600-60055

2022-02-07

0 10' 20'

Pre-Pump Test Piezometer Elevation Piezometer Date Elevation

PW-19-01 2020/01/22 2522.1

DH-19-OW2 2020/01/22 2522.3

DH-19-OW3 2020/01/22 2522.7

DH-19-OW5 2020/01/22 2522.9

DH-19-OW6B 2020/01/22 2522.0

DESIGNED

DRAWN

CHECKED

TECH. APPR.

APPROVED

ADMIN APPROVAL -

Joramo, Seth M

Walsh, Christie S

Lasater, Jacob A

Joramo, Seth M

Clark, Cody T

2020-06-02 2573.8

2020-06-02 2541.92

RESERVOIR

W.L.

2020-06-02 2541.42

W.L.

2020-06-02 2544.7

SHEET

B U

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F R

O N

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A R

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C A D

A ut oC A D

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C A D

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D A M

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GEOLOGY

SECTION C-C'

BILLINGS, MT

15-600-60056

2022-02-07

0 20' 40'10'

DESIGNED

DRAWN

CHECKED

TECH. APPR.

APPROVED

ADMIN APPROVAL -

Joramo, Seth M

Walsh, Christie S

Lasater, Jacob A

Joramo, Seth M

Clark, Cody T

RESERVOIR

W.L.

2020-06-02 2523.2

W.L.

2020-06-02 2523.8

W.L.

2020-06-022522.9

2573.82020-06-02

SHEET

B U

U O

F R

O N

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A R

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C A D

A ut oC A D

S T

C A D

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-6

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D A M

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GEOLOGY

SECTION D-D'

BILLINGS, MT

15-600-60057

2022-02-07

0 20' 40'10'

Pre-Pump Test Piezometer Elevation Piezometer Date Elevation

PW-19-01 2020/01/22 2522.1

DH-19-OW1 2020/01/22 2522.5

DH-19-OW4 2020/01/22 2522.3

DH-19-OW7 2020/01/22 2522.7

DH-19-OW8 2020/01/22 2523.3

DESIGNED

DRAWN

CHECKED

TECH. APPR.

APPROVED

ADMIN APPROVAL -

Joramo, Seth M

Walsh, Christie S

Lasater, Jacob A

Joramo, Seth M

Clark, Cody T

RESERVOIR

W.L.

2020-06-02 2517.6

2573.82020-06-02

SHEET

B U

U O

F R

O N

U .S

A R

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C A D

A ut oC A D

S T

C A D

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GEOLOGY

SECTION E-E'

BILLINGS, MT

15-600-60058

2022-02-07

0 60'30'

DESIGNED

DRAWN

CHECKED

TECH. APPR.

APPROVED

ADMIN APPROVAL -

Joramo, Seth M

Walsh, Christie S

Lasater, Jacob A

Joramo, Seth M

Clark, Cody T

SHEET

B U

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D A M

V O

N O

B O

R R O

W A

GEOLOGY

NORTH BORROW AREA -

PLAN

BILLINGS, MT

15-600-60059

2022-02-07

0 400'200'

DESIGNED

DRAWN

CHECKED

TECH. APPR.

APPROVED

ADMIN APPROVAL -

Joramo, Seth M

Walsh, Christie S

Lasater, Jacob A

Joramo, Seth M

Clark, Cody T

G10

B U

U O

F R

O N

U .S

A R

O F

C A D

A ut oC A D

S T

C A D

A M

-6

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M X -0

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-0 2-

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D A M

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N O

B O

R R O

W A

GEOLOGY

NORTH BORROW AREA

SECTION A-A'

BILLINGS, MT

15-600-60060

2022-02-07

HORIZONTAL SCALE

VERTICAL SCALE

5'0 10'

0 100' 200'

DESIGNED

DRAWN

CHECKED

TECH. APPR.

APPROVED

ADMIN APPROVAL -

Joramo, Seth M

Walsh, Christie S

Lasater, Jacob A

Joramo, Seth M

Clark, Cody T

G11

B U

U O

F R

O N

U .S

A R

O F

C A D

A ut oC A D

S T

C A D

A M

-6

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M X -0

.D W

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S A V

D A

-0 2-

S T

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B Y

N Y

K R

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N O

D A M

V O

N O

B O

R R O

W A

GEOLOGY

NORTH BORROW AREA

SECTION B-B'

BILLINGS, MT

15-600-60061

2022-02-07

HORIZONTAL SCALE

VERTICAL SCALE

5'0 10'

0 100' 200'

DESIGNED

DRAWN

CHECKED

TECH. APPR.

APPROVED

ADMIN APPROVAL -

Joramo, Seth M

Walsh, Christie S

Lasater, Jacob A

Joramo, Seth M

Clark, Cody T

G12

B U

U O

F R

O N

U .S

A R

O F

C A D

A ut oC A D

S T

C A D

A M

-6

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M X -0

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S T

S A V

D A

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B Y

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D A M

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B O

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W A

GEOLOGY

NORTH BORROW AREA

SECTION C-C', D-D'

AND E-E'

BILLINGS, MT

15-600-60062

2022-02-07

HORIZONTAL SCALE

VERTICAL SCALE

5'0 10'

0 100' 200'

DESIGNED

DRAWN

CHECKED

TECH. APPR.

APPROVED

ADMIN APPROVAL -

Joramo, Seth M

Walsh, Christie S

Lasater, Jacob A

Joramo, Seth M

Clark, Cody T

G13

B U

U O

F R

O N

U .S

A R

O F

C A D

A ut oC A D

S T

C A D

A M

-6

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M X -0

.D W

S T

S A V

D A

-0 2-

S T

S A V

B Y

N Y

K R

P R O

C T

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R A G

E D

N O

D A M

V O

S O

B O

R R O

W A

GEOLOGY

SOUTH BORROW AREA -

PLAN

BILLINGS, MT

15-600-60063

2022-02-07

0 100' 200'

C D

DESIGNED

DRAWN

CHECKED

TECH. APPR.

APPROVED

ADMIN APPROVAL -

Joramo, Seth M

Walsh, Christie S

Lasater, Jacob A

Joramo, Seth M

Clark, Cody T

G14

B U

U O

F R

O N

U .S

A R

O F

C A D

A ut oC A D

S T

C A D

A M

-6

-T

M X -0

.D W

S T

S A V

D A

-0 2-

S T

S A V

B Y

N Y

K R

P R O

C T

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R A G

E D

N O

D A M

V O

S O

B O

R R O

W A

GEOLOGY

SOUTH BORROW AREA

SECTION A-A'

BILLINGS, MT

15-600-60064

2022-02-07

HORIZONTAL SCALE

VERTICAL SCALE

5'0 10'

0 80' 160'40'

DESIGNED

DRAWN

CHECKED

TECH. APPR.

APPROVED

ADMIN APPROVAL -

Joramo, Seth M

Walsh, Christie S

Lasater, Jacob A

Joramo, Seth M

Clark, Cody T

G15

B U

U O

F R

O N

U .S

A R

O F

C A D

A ut oC A D

S T

C A D

A M

-6

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M X -0

.D W

S T

S A V

D A

-0 2-

S T

S A V

B Y

N Y

K R

P R O

C T

N O

R A G

E D

N O

D A M

V O

S O

B O

R R O

W A

GEOLOGY

SOUTH BORROW AREA

SECTION B-B'

BILLINGS, MT

15-600-60065

2022-02-07

HORIZONTAL SCALE

VERTICAL SCALE

5'0 10'

0 80' 160'40'

DESIGNED

DRAWN

CHECKED

TECH. APPR.

APPROVED

ADMIN APPROVAL -

Joramo, Seth M

Walsh, Christie S

Lasater, Jacob A

Joramo, Seth M

Clark, Cody T

G16

B U

U O

F R

O N

U .S

A R

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C A D

A ut oC A D

S T

C A D

A M

-6

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M X -0

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S T

S A V

D A

-0 2-

S T

S A V

B Y

N Y

K R

P R O

C T

N O

R A G

E D

N O

D A M

V O

S O

B O

R R O

W A

GEOLOGY

SOUTH BORROW AREA

SECTION C-C'

BILLINGS, MT

15-600-60066

2022-02-07

HORIZONTAL SCALE

VERTICAL SCALE

5'0 10'

0 80' 160'40'

DESIGNED

DRAWN

CHECKED

TECH. APPR.

APPROVED

ADMIN APPROVAL -

Joramo, Seth M

Walsh, Christie S

Lasater, Jacob A

Joramo, Seth M

Clark, Cody T

G17

B U

U O

F R

O N

U .S

A R

O F

C A D

A ut oC A D

S T

C A D

A M

-6

-T

M X -0

.D W

S T

S A V

D A

-0 2-

S T

S A V

B Y

N Y

K R

P R O

C T

N O

R A G

E D

N O

D A M

V O

S O

B O

R R O

W A

GEOLOGY

SOUTH BORROW AREA

SECTION D-D'

BILLINGS, MT

15-600-60067

2022-02-07

HORIZONTAL SCALE

VERTICAL SCALE

5'0 10'

0 80' 160'40'

DESIGNED

DRAWN

CHECKED

TECH. APPR.

APPROVED

ADMIN APPROVAL -

Joramo, Seth M

Walsh, Christie S

Lasater, Jacob A

Joramo, Seth M

Clark, Cody T

G18 emb

0.0 to 77.0 ft. EMBANKMENT (emb)

0.0 to 16.0 ft. SILT (ML): Approximately 90% low to no plasticity fines; low toughness; approximately 5% fine sand; approximately 5% fine to coarse, subrounded gravel; maximum size recovered, 2.0- in.; damp; buff to brown; very strong reaction with HCl.

Lab Results:

10.0 to 11.5 ft - Sandy Lean Clay: 58.0% Fines;

42% Sand. LL=23.6, PL=15.7, PI=7.9, M=11.1%

16.0 to 20.0 ft. SANDY SILT s(ML): Approximately 70% low plasticity fines; low dry strength;

approximately 20% very fine to fine sand;

approximatley 10% fine, subrounded gravel;

maximum size recovered, 1/4 in.; dry; buff to brown; strong reaction with HCl.

20.0 to 32.5 ft. SANDY SILT s(ML): Approximately 70% low plasticity fines; low dry strength;

approximately 30% very fine to fine sand;

maximum size recovered, fine sand; dry; very stiff;

buff to gray; strong to very strong reaction with HCl.

Lab Results:

25.0 to 26.5 ft - Sandy Lean Clay: 55.0% Fines;

45% Sand. LL=24.0, PL=13.7, PI=10.3, M=10.7%

32.5 to 46.0 ft. SANDY CLAY WITH GRAVEL s(CL)g:

Approximately 65% low to medium plasticity fines;

medium toughness; approximately 20% fine sands;

approximately 15% fine to coarse, subrounded gravel; maximum size recovered, 2-1/2 in.; dry;

stiff; buff to light brown; very strong to strong reaction with HCl.

Lab Results:

35.0 to 36.5 ft - Clayey Sand: 49.0% Fines;

39% Sand; 12% Gravel. LL=24.5, PL=12.3, PI=12.2, M=8.8%

46.0 to 53.0 ft. SANDY SILT s(ML): Approximately 70% non plastic fines; low toughness; approximately

(ML)

s(ML) s(CL)g s(ML)

LOCATION:

Station 15+02.0 ft., offset -16.3 from crest of dam.

PURPOSE OF HOLE:

Conduct Standard Penetration Testing (SPT) in the embankment and upper alluvial foundation materials to obtain density and strength data. Obtain physical properties on the SPT sampling intervals via laboratory analysis. Install a piezometer to monitor water levels.

DRILLING EQUIPMENT:

Truck mounted CME-85 rotary drill rig;

4-1/4 in. I.D. Hollow Stem Augers (HSA); 5 ft. long, 3 in. I.D. split-tube sample barrel; 3.8 ft. long, 1-3/8 in. I.D.

SPT barrel; NWJ rods; CME 140 lb automatic hammer.

DRILLER:

Sean Rafferty; USBR

DRILLING METHODS:

0.0 to 5.0 ft - Advanced drill hole with 4-1/4 in. HSA with 5 ft. long split-tube sample barrel.

5.0 to 130.0 ft.- Continuous SPT's,clean out intervals with 4-1/4 in. I.D. HSA with 5 ft. long split-tube sample barrel.

130.0 to 135.0 ft. - Advanced drill hole with 4-1/4 in. I.D. HSA with 5 ft. long split-tube sample barrel to collect overcore sample.

DRILLING/ GEOLOGY COMMENTS:

While advancing beyond the water table, the hole was filled to ground surface with water in order to lower pressures to decrease heaving sands.

34.0 to 42.5 ft. - Poor recovery due to Continued next pageCOMMENTS:

CLASSIFICATION AND

NOTES

SHEET 1 OF 3

GROUND ELEVATION: 2596.6COORDINATES:

STATE: Montana

D E

P T

PHYSICAL CONDITION

DEPTH AND ELEV OF WATER

G E

O L.

U N

Y M

S P

W S

/F T

LEVEL AND DATE MEASURED: 75.0 (2521.61) 10/17/2015

O R

E R

E C

O V

E R

PROJECT: Fresno

ANGLE FROM HORIZONTAL: AZIMUTH:

S /L

GEOLOGIC LOG OF DRILL HOLE: SPT15-03

FEATURE: Fresno Dam

DEPTH TO BEDROCK: 86.5

LOCATION: Station 15+02.0 ft. Offset -16.3 Crest of Dam

BEGUN: 10/13/15 FINISHED: 10/21/15 TOTAL DEPTH: 135.0

HOLE LOGGED BY: K. Roccoforte

REVIEWED BY: K. Scannella

F R

E S

N O

P J

L O

G _2

.G D

/1 emb

Qal

Kjr

25% fine sand; approximately 5% fine, subrounded gravel; maximum size recovered, 1-1/2 in.; dry;

very stiff; light brown to gray; very strong reaction with HCl.

53.0 to 77.0 ft. SANDY CLAY s(CL):

Approximately 75% low to medium plasticity fines;

medium toughness; approximately 20% fine sand;

5% fine to coarse, subrounded to subangular gravel;

maximum size 3.0 in.; coarse, quartz gravel to 3.0 in.

from 58.0 to 59.0 ft., moist with wet zones in sand and gravel; very stiff; brown; very strong to strong reaction with HCl.

Lab Results:

60.0 to 61.5 ft - Sandy Silty Clay: 56.0% Fines;

44% Sand. LL=21.1, PL=15.6, PI=5.5, M=11.5%

75.0 to 76.5 ft - Sandy Lean Clay: 58.0% Fines;

42% Sand. LL=24.8, PL=12.3, PI=12.5, M=13.5%

77.0 to 85.0 ft. QUATERNARY ALLUVIUM (Qal)

77.0 to 85.0 ft. SILT (ML): Approximately 85% low to no plasticity fines; approximately 10% fine sand;

approximately 5% fine to coarse, subrounded gravel;

predominantly fine gravel; from 82.5 to 82.7 ft. a layer of quartz cobbles; maximum size recovered,

3.0 in.; moist to wet; very stiff; brown; strong reaction with HCl.

Lab Results:

80.0 to 81.5 ft - Sandy Lean Clay: 64.0% Fines;

36% Sand. LL=23.2, PL=14.6, PI=8.6, M=12.9%

85.0 to 135.0 ft. CREATACEOUS JUDITH RIVER FORMATION (Kjr)

85.0 to 86.5 ft. POORLY LITHIFIED SILTSTONE (sltst): Poorly lithified Siltstone classified as silt (ML): Approximately 90% low to no plasticity fines; approximately 5% fine sand;

approximately 5% fine, subrounded gravel;

maximum size recovered, 1/4- in.; wet; very stiff;

brown; black organic streaks 85.0 to 86.0 ft.;

strong reaction with HCl.

Lab Results:

85.0 to 86.5 ft - Sandy Lean Clay: 59.0% Fines;

41% Sand. LL=22.7, PL=13.6, PI=9.1, M=14.9%

86.5 to 97.5 ft. NO RECOVERY- HEAVING SAND

97.5 to 104.0 ft. POORLY LITHIFIED SANDSTONE (ss): Poorly lithified Sandstone classified as poorly graded sand with clay (SP-SC):

Approximately 85% very fine to medium sand;

approximately 10% low plasticity fines;

approximately 5% fine, subrounded gravel;

maximum size recovered, 1/4 in.; wet;

compact; medium gray; trace tiny fragments of shells at 103.5 ft.; strong s(ML) s(CL)

(ML)

N/R

(ss) coarse gravel lenses at 36.0 ft., 38.0 ft., 38.5 ft., 40.7 ft., and 41.3 ft..

42.5 to 44.0 ft. - No recovery due to rock in bottom of SPT barrel.

70.0 to 71.5 ft. - Material very loose within sample interval; no recovery.

79.0 to 80.0 ft. - Material very loose within cleanout interval; no recovery.

Poor SPT sample recovery 86.5 to 97.5 ft., lithology described from cleanout intervals.

86.5 to 97.5 ft. - No recovery due to heaving sands.

99.0 to 102.5 ft. - Material very loose within sample interval; no recovery.

105.0 to 111.5 ft. - No recovery due to heaving sands.

125.0 to 126.5 ft. - No recovery, sample plugging off.

127.5 to 129.0 ft. - No recovery, sample plugging off.

WATER LEVELS:

10/17/15 - 75.0 ft.

HOLE COMPLETION:

(10/24/15) Hole caved back from 135.0 to approximately 125.0 ft. Placed Enviroplug (3/8 inch bentonite chips) from 125.0 to 105.0 ft. and C33 silica sand filter pack from 105.0 to 99.0 ft.

Set tip of 5.0-ft-long, 2-inch I.D. screen (slotted 0.010-inch PVC) with schedule 40 riser pipe at 99.0 ft. (elev. 2497.0 ft.)

Surrounded porous tube with C33 silica sand from 99.0 to 85.0 ft., and Enviroplug (3/8 inch bentonite chips) from 85.0 to 3.0 ft. below ground

CLASSIFICATION AND

NOTES

SHEET 2 OF 3

GROUND ELEVATION: 2596.6COORDINATES:

STATE: Montana

D E

P T

PHYSICAL CONDITION

DEPTH AND ELEV OF WATER

G E

O L.

U N

Y M

S P

W S

/F T

LEVEL AND DATE MEASURED: 75.0 (2521.61) 10/17/2015

O R

E R

E C

O V

E R

PROJECT: Fresno

ANGLE FROM HORIZONTAL: AZIMUTH:

S /L

GEOLOGIC LOG OF DRILL HOLE: SPT15-03

FEATURE: Fresno Dam

DEPTH TO BEDROCK: 86.5

LOCATION: Station 15+02.0 ft. Offset -16.3 Crest of Dam

BEGUN: 10/13/15 FINISHED: 10/21/15 TOTAL DEPTH: 135.0

HOLE LOGGED BY: K. Roccoforte

REVIEWED BY: K. Scannella

F R

E S

N O

P J

L O

G _2

.G D

Kjr reaction with HCl.

Lab Results:

102.5 to 104.0 ft - Silty Sand: 36.0% Fines;

64% Sand. LL=NA, PL=NA, PI=NP, M=24.4%

104.0 to 115.0 ft. NO RECOVERY- HEAVING SAND

115.0 to 122.0 ft POORLY LITHIFIED SANDSTONE (ss): Poorly lithified Sandstone classified as poorly graded sand (SP): Approximately 95% fine to medium sand; maximum size recovered, medium sand; approximately 5% low plasticity fines; wet; compact; medium gray; trace tiny fragments of shells; strong reaction with HCl.

Lab Results:

115.0 to 116.5 ft - Silty Sand: 18.0% Fines;

82% Sand. LL=NA, PL=NA, PI=NP, M=24.8%

120.0 to 121.5 ft - Silty Sand: 23.0% Fines;

77% Sand. LL=NA, PL=NA, PI=NP, M=24.8%

122.0 to 125.0 POORLY LITHIFIED SANDSTONE (ss): Poorly lithified Sandstone classified as clayey sand (SC): Approximately 80% fine to medium sand; unconsolidated; maximum size recovered, medium sand; approximately 20% low to medium plasticity fines; wet; compact;

medium gray; strong reaction with HCl.

Lab Results:

122.5 to 124.0 ft - Sandy Lean Clay: 43.0% Fines;

57% Sand. LL=21.0, PL=18.3, PI=2.7, M=23.4%

125.0 to 135.0 ft. INTENSELY WEATHERED CLAYSTONE (claystone): Intensely weathered Claystone (W7) classified as lean clay (CL):

Approximately 95% low to medium plasticity fines;

medium toughness; approximately 5% silt;

maximum size recovered, silt; light to medium gray with tan laminae; strong reaction with HCl.

BOTTOM OF HOLE

(ss)

(clyst) surface. Placed gravel for drainage from 3.0 ft. to 6.0 in. below surface.

Set steel flush mount case and grouted with neat cement to ground surface.

CLASSIFICATION AND

NOTES

SHEET 3 OF 3

GROUND ELEVATION: 2596.6COORDINATES:

STATE: Montana

D E

P T

PHYSICAL CONDITION

DEPTH AND ELEV OF WATER

G E

O L.

U N

Y M

S P

W S

/F T

LEVEL AND DATE MEASURED: 75.0 (2521.61) 10/17/2015

O R

E R

E C

O V

E R

PROJECT: Fresno

ANGLE FROM HORIZONTAL: AZIMUTH:

S /L

GEOLOGIC LOG OF DRILL HOLE: SPT15-03

FEATURE: Fresno Dam

DEPTH TO BEDROCK: 86.5

LOCATION: Station 15+02.0 ft. Offset -16.3 Crest of Dam

BEGUN: 10/13/15 FINISHED: 10/21/15 TOTAL DEPTH: 135.0

HOLE LOGGED BY: K. Roccoforte

REVIEWED BY: K. Scannella

F R

E S

N O

P J

L O

G _2

.G D

/1 fill

Qal

Kjr

0.0 to 26.4 ft. FILL

0.0 to 9.0 ft. SANDY SILT s(ML): Approximately 60% nonplastic fines; approximately 40% fine sand;

trace of fine subrounded/subangular gravel;

maximum size recovered, 1-1/2 in.; roots from 0.0 to 0.6 ft.; lean clay lens from 8.0 to 8.3 ft.;

gravel lens from 7.4 to 7.5 ft.; brown; moist; soft.

9.0 to 14.0 ft. SILTY SAND (SM): Approximately 60% fine to medium sand; maximum size medium sand; approximately 40% nonplastic fines; tan; slightly moist; soft.

Lab Results:

8.9 to 10.4 ft - Silty Sand: 18.0% Fines;

82% Sand. LL=NA, PL=18.3, PI=NP, M=4.0%

14.0 to 26.4 ft. SANDY SILT s(ML):

Approximately 50% nonplastic fines;

approximately 40% fine sand; approximately 10% subrounded, weathered sandstone gravel;

a 3 in. hard, igneous, subangular cobble at 23.6 ft.;

maximum size recovered, 3 in.; roots throughout, with charcoal and organic smell.

Lab Results:

18.9 to 20.4 ft - Silty Clayey Sand: 44.0% Fines;

48% Sand; 8% Gravel. LL=22.5, PL=15.6, PI=6.9, M=9.0%

23.9 to 25.4 ft - Lean Clay: 93.0% Fines;

7% Sand. LL=37.0, PL=16.7, PI=20.3, M=23.7%

26.4 to 30.0 ft. QUATERNARY ALLUVIUM (Qal)

26.4 to 30.0 ft. SILTY SAND (SM): Approximately 70% fine sand; approximately 30% nonplastic fines;

maximum size recovered, coarse sand; gray; wet;

very soft.

Lab Results:

26.7 to 27.9 ft - Silty Sand: 13.0% Fines;

87% Sand. LL=NA, PL=NA, PI=NP, M=21.5% s(ML)

(SM)

s(ML)

(SM)

(ss)

LOCATION:

Station 21+97.6 ft., offset -231.4 from crest of dam. At toe of dam.

PURPOSE OF HOLE:

Conduct Standard Penetration Testing (SPT) in the upper alluvial foundation materials to obtain density and strength data. Obtain physical properties on the SPT sampling intervals via laboratory analysis.

DRILLING EQUIPMENT:

Truck mounted CME-85 rotary drill rig;

4-1/4 in. I.D. Hollow Stem Augers (HSA); 5 ft. long, 3 in. I.D. split-tube sample barrel; 3.8 ft. long, 1-3/8 in. I.D.

SPT barrel; NWJ rods; CME 140 lb automatic hammer.

DRILLER:

Cody Kelly; USBR

DRILLING METHODS

0.0 to 8.9 ft. - Advanced drill hole with 4-1/4 in. HSA with centerbit assembly.

8.9 to 100.4 ft. - Continuous SPTs, clean out intervals with 4-1/4 in. I.D. HSA with 5 ft. long split-tube sample barrel.

DRILLING/ GEOLOGY COMMENTS:

Drilling slow using heavy down pressure from 8.9 to 21.4 ft. due to pushing cobble.

Used core catcher with baggie in 3.0-in.

overcore from 26.4 ft.

While advancing beyond the water table, the hole was filled to ground surface with water in order to lower pressures to decrease heaving sands.

Sampler ran out of HCL during field Continued next pageCOMMENTS:

CLASSIFICATION AND

NOTES

SHEET 1 OF 5

GROUND ELEVATION: 2541.9COORDINATES:

STATE: Montana

D E

P T

PHYSICAL CONDITION

DEPTH AND ELEV OF WATER

G E

O L.

U N

Y M

S P

W S

/F T

LEVEL AND DATE MEASURED: 10/22/15 / 10/25/15

O R

E R

E C

O V

E R

PROJECT: Fresno

ANGLE FROM HORIZONTAL: AZIMUTH:

S /L

GEOLOGIC LOG OF DRILL HOLE: SPT15-05

FEATURE: Fresno Dam

DEPTH TO BEDROCK: 32.0

LOCATION: Station 21+97.6 ft. Offset -231.4 Toe of Dam

BEGUN: 10/21/15 FINISHED: 10/25/15 TOTAL DEPTH: 100.4

HOLE LOGGED BY: C. Clark

REVIEWED BY: K. Scannella

F R

E S

N O

P J

L O

G _2

.G D

Kjr

30.0 to 100.4 ft. CRETACEOUS JUDITH RIVER FORMATION (Kjr)

30.0 to 51.4 ft. POORLY LITHIFIED SANDSTONE (ss): Poorly lithified Sandstone (ss) classified as silty sand (SM): Approximately 70% fine sand;

approximately 20% nonplastic fines; 10% high plastic fines; maximum size recovered, coarse sand; some roots and organics, including charcoal from 46.4 to 47.9 ft.; fat clay lens from

38.6 to 38.9 ft., 41.8 to 42.3 ft., 43.6 to 43.9 ft.,

44.6 to 44.7 ft., and 49.5 to 49.6 ft.; gray; wet;

very soft.

Lab Results:

31.4 to 33.9 ft - Silty Sand: 15.0% Fines;

85% Sand. LL=NA, PL=NA, PI=NP, M=21.5%

34.9 to 36.4 ft - M=24.4%

36.4 to 37.9 ft - M=22.5%

38.9 to 40.4 ft - Poorly Graded Sand With Silt:

11.0% Fines; 89% Sand. LL=NA, PL=NA, PI=NP, M=19.5% At 41.4 ft - M=22.9% At 43.9 ft - M=27.6%

46.4 to 47.9 ft - Silty Sand: 49.0% Fines;

51% Sand. LL=NA, PL=NA, PI=NP, M=26.3%

48.9 to 50.4 ft - Silty Sand: 37.0% Fines;

63% Sand. LL=NA, PL=NA, PI=NP, M=31.9%

51.4 to 53.9 ft. POORLY LITHIFIED SILTSTONE (sltst): Poorly lithified Siltstone (sltst) classified as sandy silt s(ML): Approximately 70% nonplastic fines; approximately 30% fine sand;

predominantly gray; wet; very soft; laminated with very fine organic material throughout.

53.9 to 58.9 ft. INTENSELY WEATHERED CLAYSTONE (clyst): Intensely weathered claystone (W7) classified as fat clay (CH):

Approximately 90% high plasticity fines;

approximately 10% fine sand; tan to light brown;

wet; very soft; black organic layer from 57.1 to 57.2 ft..

Lab Results:

53.9 to 55.4 ft - Lean Clay: 95.0% Fines;

5% Sand. LL=44.4, PL=15.8, PI=28.6, M=30.3%

56.4 to 57.9 ft - Fat Clay: 96.0% Fines;

4% Sand. LL=78.2, PL=20.0, PI=58.2, M=30.6%

58.9 to 61.1 ft. POORLY LITHIFIED SANDSTONE (ss): Poorly lithified Sandstone (ss) classified as silty sand (SM): Approximately 60% fine sand;

approximately 40% nonplastic fines; gray; wet;

very soft; moderately bedded.

61.1 to 61.3 ft. INTENSELY WEATHERED CLAYSTONE (clyst): Intensely weathered Claystone (W7) classified as fat clay (CH):

Approximately 90% high plasticity fines;

approximately 10% fine sand; gray; wet;

BOTTOM OF HOLE

(ss)

(sltst)

(clyst)

(ss)

(clyst) (sltst) (clyst)

(sltst)

(clyst)

(ss)

(clyst)

(ss) (clyst)

(ss)

(clyst) (ss)

(clyst)

(ss) operations. No HCL reactions recorded for this borehole.

91.4 to 93.9 ft. - No recovery, wet sample fell out of barrel.

98.9 to 100.4 ft. - No blows recorded due to field error.

WATER LEVELS:

10/22/15 - 20.5 ft.

HOLE COMPLETION:

(10/25/15) Backfilled hole with medium bentonite chips from 100.4 ft. to ground surface.

CLASSIFICATION AND

NOTES

SHEET 2 OF 5

GROUND ELEVATION: 2541.9COORDINATES:

STATE: Montana

D E

P T

PHYSICAL CONDITION

DEPTH AND ELEV OF WATER

G E

O L.

U N

Y M

S P

W S

/F T

LEVEL AND DATE MEASURED: 10/22/15 / 10/25/15

O R

E R

E C

O V

E R

PROJECT: Fresno

ANGLE FROM HORIZONTAL: AZIMUTH:

S /L

GEOLOGIC LOG OF DRILL HOLE: SPT15-05

FEATURE: Fresno Dam

DEPTH TO BEDROCK: 32.0

LOCATION: Station 21+97.6 ft. Offset -231.4 Toe of Dam

BEGUN: 10/21/15 FINISHED: 10/25/15 TOTAL DEPTH: 100.4

HOLE LOGGED BY: C. Clark

REVIEWED BY: K. Scannella

F R

E S

N O

P J

L O

G _2

.G D

/1 very soft.

61.3 to 61.9 ft. POORLY LITHIFIED SILTSTONE (sltst): Poorly lithified Siltstone (sltst) classified as sandy silt s(ML): Approximately 60% low plasticity fines; approximately 40% fine sand;

gray; wet; very soft.

Lab Results:

At 61.4 ft - M=24.8%

61.9 to 62.9 ft. INTENSELY WEATHERED CLAYSTONE (clyst): Intensely weathered Claystone (W7) classified as fat clay (CH):

Approximately 80% high plasticity fines;

approximately 20% fine sand; brown;

wet; very soft.

62.9 to 68.9 ft. POORLY LITHIFIED SILTSTONE (sltst): Poorly lithified Siltstone (sltst) classified as silt with sand (ML)s: Approximately 80% nonplastic to low plastic fines; approximately 20% fine sand; brown; wet; very soft; lens of lean clay 1-in. thick at 63.0 ft. and 65.0 ft., from 66.2 to 66.4 ft., and 67.7 to 67.9 ft.

Lab Results:

66.4 to 67.9 ft - Lean Clay With Sand: 82.0% Fines;

18% Sand. LL=26.8, PL=18.9, PI=7.9, M=25.0%

68.9 to 79.1 ft. POORLY LITHIFIED SILTSTONE (sltst): Poorly lithified Siltstone (sltst) classified as sandy silt s(ML): Approximately 70% nonplastic fines; approximately 30% fine sand; gray; wet;

very soft.

Lab Results:

71.4 to 72.9 ft - Silt With Sand: 74.0% Fines;

26% Sand. LL=23.3, PL=20.8, PI=2.5, M=26.3%

73.9 to 75.4 ft - M=31.1% At 76.4 ft - M=28.6%

79.1 to 86.2 ft. INTENSELY WEATHERED CLAYSTONE (clyst): Intensely weathered Claystone (W7) classified as lean clay (CL):

Approximately 90% medium plasticity fines;

approximately 10% fine sand; gray to brown; wet;

very soft.

86.2 to 86.4 ft. INTENSELY WEATHERED CLAYSTONE (claystone): Intensely weathered Claystone (W7) classified as fat clay (CH):

Approximately 95% high plasticity fines;

approximately 5% fine sand; gray to brown;

wet; firm.

86.4 to 89.4 ft. POORLY LITHIFIED SANDSTONE (ss): Poorly lithified Sandstone (ss) classified as poorly graded sand with silt (SP-SM):

Approximately 90% fine to medium sand;

approximately 10% nonplastic fines; gray; wet;

CLASSIFICATION AND

NOTES

SHEET 3 OF 5

GROUND ELEVATION: 2541.9COORDINATES:

STATE: Montana

D E

P T

PHYSICAL CONDITION

DEPTH AND ELEV OF WATER

G E

O L.

U N

Y M

S P

W S

/F T

LEVEL AND DATE MEASURED: 10/22/15 / 10/25/15

O R

E R

E C

O V

E R

PROJECT: Fresno

ANGLE FROM HORIZONTAL: AZIMUTH:

S /L

GEOLOGIC LOG OF DRILL HOLE: SPT15-05

FEATURE: Fresno Dam

DEPTH TO BEDROCK: 32.0

LOCATION: Station 21+97.6 ft. Offset -231.4 Toe of Dam

BEGUN: 10/21/15 FINISHED: 10/25/15 TOTAL DEPTH: 100.4

HOLE LOGGED BY: C. Clark

REVIEWED BY: K. Scannella

F R

E S

N O

P J

L O

G _2

.G D

/1 very soft.

Lab Results:

At 88.9 ft - M=31.5%

89.4 to 91.4 ft. INTENSELY WEATHERED CLAYSTONE (clyst): Intensely weathered Claystone (W7) classified as lean clay (CL):

Approximately 95% medium to high plasticity fines; approximately 5% fine sand.

91.4 to 92.4 ft. POORLY LITHIFIED SANDSTONE (ss): Poorly lithified Sandstone (ss) classified as poorly graded sand with silt (SP-SM): Approximately 90% medium to coarse sand; approximately 10% nonplastic fines; gray; wet; very soft.

92.4 to 92.9 ft. INTENSELY WEATHERED CLAYSTONE (clsyst): Intensely weathered Claystone (W7) classified as lean clay (CL):

Approximately 90% medium to high plasticity fines;

approximately 10% fine sand; gray; wet; very soft.

92.9 to 93.9 ft. POORLY LITHIFIED SANDSTONE (ss): Poorly lithified Sandstone (ss) classified as poorly graded sand with silt (SP-SM):

Approximately 90% fine to medium sand;

approximately 10% nonplastic fines; gray; wet;

very soft.

93.9 to 94.8 ft. POORLY LITHIFIED SANDSTONE (ss): Poorly lithified Sandstone (ss) classified as poorly graded sand with silt (SP-SM):

Approximately 90% medium to coarse sand; approximately 10% nonplastic fines; gray;

wet; very soft.

Lab Results:

93.9 to 94.8 ft - Silty Sand: 16.0% Fines;

84% Sand. LL=NA, PL=NA, PI=NP, M=21.8%

94.8 to 95.4 ft. INTENSELY WEATHERED CLAYSTONE (clyst): Intensely weathered Claystone (W7) classified as lean clay (CL):

Approximately 90% medium to high plasticity fines; approximately 10% fine sand; gray; wet;

very soft.

95.4 to 96.0 ft. POORLY LITHIFIED SANDSTONE (ss): Poorly lithified Sandstone (ss) classified as poorly graded sand with silt (SP-SM):

Approximately 90% medium to coarse sand;

approximately 10% nonplastic fines; gray;

wet; very soft.

96.0 to 97.1 ft. INTENSELY WEATHERED CLAYSTONE (clyst): Intensely weathered Claystone (W7) classified as lean clay (CL):

Approximately 90% medium to high plasticity fines;

approximately 10% fine sand; gray; wet; very soft.

CLASSIFICATION AND

NOTES

SHEET 4 OF 5

GROUND ELEVATION: 2541.9COORDINATES:

STATE: Montana

D E

P T

PHYSICAL CONDITION

DEPTH AND ELEV OF WATER

G E

O L.

U N

Y M

S P

W S

/F T

LEVEL AND DATE MEASURED: 10/22/15 / 10/25/15

O R

E R

E C

O V

E R

PROJECT: Fresno

ANGLE FROM HORIZONTAL: AZIMUTH:

S /L

GEOLOGIC LOG OF DRILL HOLE: SPT15-05

FEATURE: Fresno Dam

DEPTH TO BEDROCK: 32.0

LOCATION: Station 21+97.6 ft. Offset -231.4 Toe of Dam

BEGUN: 10/21/15 FINISHED: 10/25/15 TOTAL DEPTH: 100.4

HOLE LOGGED BY: C. Clark

REVIEWED BY: K. Scannella

F R

E S

N O

P J

L O

G _2

.G D

Lab Results:

At 96.4 ft - M=23.7%

97.1 to 100.4 ft. POORLY LITHIFIED SANDSTONE (ss): Poorly lithified Sandstone (ss) classified as poorly graded sand with silt (SP-SM): Approximately 90% medium to coarse sand; approximately 10% nonplastic fines; gray; wet; very soft. Intensely weathered claystone lenses 1-in. thick at

97.9 and 98.9 ft.

CLASSIFICATION AND

NOTES

SHEET 5 OF 5

GROUND ELEVATION: 2541.9COORDINATES:

STATE: Montana

D E

P T

PHYSICAL CONDITION

DEPTH AND ELEV OF WATER

G E

O L.

U N

Y M

S P

W S

/F T

LEVEL AND DATE MEASURED: 10/22/15 / 10/25/15

O R

E R

E C

O V

E R

PROJECT: Fresno

ANGLE FROM HORIZONTAL: AZIMUTH:

S /L

GEOLOGIC LOG OF DRILL HOLE: SPT15-05

FEATURE: Fresno Dam

DEPTH TO BEDROCK: 32.0

LOCATION: Station 21+97.6 ft. Offset -231.4 Toe of Dam

BEGUN: 10/21/15 FINISHED: 10/25/15 TOTAL DEPTH: 100.4

HOLE LOGGED BY: C. Clark

REVIEWED BY: K. Scannella

F R

E S

N O

P J

L O

G _2

.G D

/2 ts fill

Qal

Kjr

0.0 to 0.8 ft. TOPSOIL (ts)

0.0 to 0.8 ft. SANDY SILT s(ML): Approximately 60% nonplastic fines; approximately 40% fine sand;

brown and tan; moist; firm; roots throughout.

0.8 to 22.3 ft. FILL

0.8 to 5.0 ft. SILTY SAND (SM): Approximately 60% fine sand; approximately 40% nonplastic fines; trace of soft, angular, poorly lithified sandstone fragments, (crumbles in fingers);

maximum size recovered, 1-1/2 in.; tan and gray;

dry; firm; moderately soft.

5.0 to 13.8 ft. SANDY SILT s(ML): Approximately 55% nonplastic fines; approximately 45% fine sand;

trace of coarse gravel; maximum size recovered, 2 in.; brown, tan, and gray; dry; soft.

13.8 to 15.7 ft. SILTY SAND (SM): Approximately 70% fine sand; approximately 30% nonplastic fines; trace of fine to coarse, subrounded, hard, gravel; maximum size recovered, 1-1/2 in.;

brown and reddish-brown; dry; firm and compact.

Lab Results:

14.5 to 16.0 ft - Silty Sand: 22.0% Fines;

78% Sand. LL=NA, PL=NA, PI=NP, M=8.2%

15.7 to 22.3 ft. SANDY LEAN CLAY s(CL):

Approximately 60% low plasticity fines;

approximately 20% fine sand; approximately 20% fine subrounded, gravel; maximum size recovered, 2-1/2 in.; brown; moist; firm.

Lab Results:

17.0 to 18.5 ft - Sandy Lean Clay: 53.0% Fines;

40% Sand; 7% Gravel. LL=22.2, PL=14.2, PI=8.0, M=9.5%

22.3 to 30.0 ft. QUATERNARY ALLUVIUM (Qal)

22.3 to 25.8 ft. SANDY SILT s(ML): Approximately 60% nonplastic fines; approximately 40% fine sand;

gray; wet; very soft; roots and organics throughout.

s(ML)

(SM)

s(ML)

(SM)

s(CL) s(ML)

(ML)

(ss)

LOCATION:

Station 17+50.3 ft., offset -227.7 from crest of dam. At toe of dam.

PURPOSE OF HOLE:

DRILLING EQUIPMENT:

Truck mounted CME-85 rotary drill rig;

4-1/4 in. I.D. Hollow Stem Augers (HSA); 5 ft. long, 3 in. I.D. split-tube sample barrel; 3.8 ft. long, 1-3/8 in. I.D.

SPT barrel; NWJ rods; CME 140 lb automatic hammer.

DRILLER:

Cody Kelly; USBR

DRILLING METHODS

0.0 to 14.5 ft. - Advanced drill hole with 4-1/4 in. HSA with centerbit assembly.

14.5 to 97.5 ft. - Continuous SPTs, clean out intervals with 4-1/4 in. I.D. HSA with 5 ft. long split-tube sample barrel.

97.5 to 122.5 ft. - Stopped SPT testing at 97.5 ft. in favor of obtaining a good "undisturbed" core sample of foundation clay (claystone) for lab testing. However, only sandstone was encountered to a depth of 121.5 ft.

Advanced drill hole with 4-1/4 in. I.D.

HSA with 5 ft. long split-tube sample barrel to 122.5 ft. Top of claystone at

121.5 ft.

122.5 to 127.5 ft. - SPT to 124.0 ft. then clean out interval to 127.5 ft.

127.5 to 131.5 ft. - Advanced drill hole Continued next pageCOMMENTS:

CLASSIFICATION AND

NOTES

SHEET 1 OF 5

GROUND ELEVATION: 2541.5COORDINATES:

STATE: Montana

D E

P T

PHYSICAL CONDITION

DEPTH AND ELEV OF WATER

G E

O L.

U N

Y M

S P

W S

/F T

LEVEL AND DATE MEASURED: 11/4/15 / 11/8/15

O R

E R

E C

O V

E R

PROJECT: Fresno

ANGLE FROM HORIZONTAL: AZIMUTH:

S /L

GEOLOGIC LOG OF DRILL HOLE: SPT15-06

FEATURE: Fresno Dam

DEPTH TO BEDROCK: 30.0

LOCATION: Station 17+50.3 ft. Offset -227.7 Toe of Dam

BEGUN: 10/25/15 FINISHED: 11/7/15 TOTAL DEPTH: 131.5

HOLE LOGGED BY: C. Clark

REVIEWED BY: K. Scannella

F R

E S

N O

P J

L O

G _2

.G D

Kjr

Lab Results:

22.0 to 23.5 ft - M=15.2%

25.8 to 30.0 ft. SILT WITH SAND (ML)s:

Approximately 80% nonplastic and low plasticity fines; approximately 20% fine sand.

Lab Results:

27.8 to 28.5 ft - Poorly Graded Sand With Silt:

8.0% Fines; 92% Sand. LL=NA, PL=NA, PI=NP, M=24.6%

30.0 to 131.5 ft. - CRETACEOUS JUDITH RIVER FORMATION (Kjr)

30.0 to 50.1 ft. POORLY LITHIFIED SANDSTONE (ss): Poorly lithified Sandstone (ss) classified as silty sand (SM): Approximately 70% fine sand;

approximately 30% nonplastic fines; laminated;

lean clay from 46.3 to 46.7 ft. and from 48.4 to 48.9 ft.; brown; wet; soft.

Lab Results:

29.5 to 31.0 ft - Silty Sand: 14.0% Fines;

86% Sand. LL=NA, PL=NA, PI=NP, M=20.0% At 34.5 ft - M=24.8%

37.0 to 38.5 ft - Poorly Graded Sand With Silt:

8.0% Fines; 92% Sand. LL=NA, PL=NA, PI=NP, M=23.7% At 39.5 ft - M=23.5%

42.0 to 43.5 ft - Poorly Graded Sand With Silt:

9.0% Fines; 91% Sand. LL=NA, PL=NA, PI=NP, M=21.0% At 44.5 ft - M=26.5%

50.1 to 50.7 ft. POORLY LITHIFIED SILTSTONE (sltst): Poorly lithified Siltstone (sltst) classified as silt with sand (ML)s: Approximately 80% nonplastic fines; approximately 20% fine sand;

brown; wet; moderately soft.

Lab Results:

At 50.5 ft - M=24.9%

50.7 to 53.2 ft. INTENSELY WEATHERED CLAYSTONE (clyst): Intensely weathered Claystone (W7) classified as fat clay with sand (CH)s: Approximately 80% high plasticity fines; approximately 20% fine sand; gray; wet;

soft.

Lab Results:

At 52.0 ft - M=30.5%

53.2 to 55.0 ft. POORLY LITHIFIED SANDSTONE (ss): Poorly lithified Sandstone (ss) classified as silty sand(SM): Approximately 60% fine sand;

approximately 40% nonplastic fines; gray; wet;

very soft.

Lab Results:

(sltst)

(clyst)

(ss)

(sltst)

(ss)

(clyst)

(sltst)

(ss)

(sltst) (ss)

(sltst)

(ss)

(clyst)

(sltst)

(ss)

N/R

(ss) with 4-1/4 in. I.D. HSA with 5 ft. long split-tube sample barrel to collect overcore sample.

DRILLING/ GEOLOGY COMMENTS:

Used core catcher with baggie in 3.0-in.

split barrel sampler to increase recovery in soft sand below the water table.

While advancing beyond the water table, the hole was filled to ground surface with water in order to lower pressures to decrease heaving sands.

Sampler ran out of HCL during field operations. No HCL reactions recorded for this borehole.

WATER LEVELS:

11/4/15 - 20.7 ft.

11/8/15 - 11.8 ft.

HOLE COMPLETION:

(11/08/15) Backfilled hole with medium bentonite chips from 131.5 ft. to ground surface.

CLASSIFICATION AND

NOTES

SHEET 2 OF 5

GROUND ELEVATION: 2541.5COORDINATES:

STATE: Montana

D E

P T

PHYSICAL CONDITION

DEPTH AND ELEV OF WATER

G E

O L.

U N

Y M

S P

W S

/F T

LEVEL AND DATE MEASURED: 11/4/15 / 11/8/15

O R

E R

E C

O V

E R

PROJECT: Fresno

ANGLE FROM HORIZONTAL: AZIMUTH:

S /L

GEOLOGIC LOG OF DRILL HOLE: SPT15-06

FEATURE: Fresno Dam

DEPTH TO BEDROCK: 30.0

LOCATION: Station 17+50.3 ft. Offset -227.7 Toe of Dam

BEGUN: 10/25/15 FINISHED: 11/7/15 TOTAL DEPTH: 131.5

HOLE LOGGED BY: C. Clark

REVIEWED BY: K. Scannella

F R

E S

N O

P J

L O

G _2

.G D

Kjr

53.2 to 55.0 ft - Silty Sand: 26.0% Fines;

74% Sand. LL=NA, PL=NA, PI=NP, M=23.8%

55.0 to 55.5 ft. POORLY LITHIFIED SILTSTONE (sltst): Poorly lithified Siltstone (sltst) classified as sandy silt s(ML): Approximately 60% nonplastic fines; approximately 40% fine sand;

brown; wet; very soft.

Lab Results:

55.0 to 55.5 ft - Silty Clay: 86.0% Fines;

14% Sand. LL=27.3, PL=20.4, PI=6.9, M=24.9%

55.5 to 59.5 ft. POORLY LITHIFIED SILTSTONE (sltst): Poorly lithified Siltstone (sltst) classified as silt with sand (ML)s: Approximately 80% low plasticity fines; approximately 20% fine sand;

lean clay lenses 1.0 to 1-1/2 in. thick from 55.8 to 56.2 ft.; brown; wet; very soft.

Lab Results:

57.0 to 58.5 ft - M=28.2%

59.5 to 63.2 ft. POORLY LITHIFIED SANDSTONE (ss): Poorly lithified Sandstone (ss) classified as silty sand (SM): Approximately 55% fine sand; approximately 45% nonplastic fines; wet;

very soft; laminated with organics throughout.

Lab Results:

59.5 to 61.0 ft - Silty Sand: 46.0% Fines;

54% Sand. LL=NA, PL=NA, PI=NP, M=26.0% At 62.0 ft - M=23.7%

63.2 to 68.5 ft. - INTENSELY WEATHERED CLAYSTONE (clyst): Intensely weathered Claystone (W7) classified as fat clay with sand (CH)s: approximately 80% high plasticity fines; approximately 20% fine sand; moist;

firm; some claystone rock texture noted.

Lab Results:

64.5 to 66.0 ft - Fat Clay: 99.0% Fines;

1% Sand. LL=56.8, PL=20.5, PI=36.3, M=26.5%

67.0 to 68.5 ft - M=32.4%

68.5 to 75.3 ft. POORLY LITHIFIED SILTSTONE (sltst): Poorly lithified Siltstone (sltst) classified as sandy silt s(ML): Approximately 70% nonplastic to low plasticity fines;

approximately 30% fine sand; brown; wet;

very soft.

Lab Results:

69.0 to 71.0 ft - Sandy Silt: 69.0% Fines;

31% Sand. LL=NA, PL=NA, PI=NP, M=27.7% At 72.0 ft - M=26.5%

75.3 to 76.0 ft. POORLY LITHIFIED SILTSTONE (sltst): Poorly lithified Siltstone (sltst) classified as silt (ML): Approximately 90% nonplastic fines;

BOTTOM OF HOLE

(ss)

(clyst)

CLASSIFICATION AND

NOTES

SHEET 3 OF 5

GROUND ELEVATION: 2541.5COORDINATES:

STATE: Montana

D E

P T

PHYSICAL CONDITION

DEPTH AND ELEV OF WATER

G E

O L.

U N

Y M

S P

W S

/F T

LEVEL AND DATE MEASURED: 11/4/15 / 11/8/15

O R

E R

E C

O V

E R

PROJECT: Fresno

ANGLE FROM HORIZONTAL: AZIMUTH:

S /L

GEOLOGIC LOG OF DRILL HOLE: SPT15-06

FEATURE: Fresno Dam

DEPTH TO BEDROCK: 30.0

LOCATION: Station 17+50.3 ft. Offset -227.7 Toe of Dam

BEGUN: 10/25/15 FINISHED: 11/7/15 TOTAL DEPTH: 131.5

HOLE LOGGED BY: C. Clark

REVIEWED BY: K. Scannella

F R

E S

N O

P J

L O

G _2

.G D

/1 approximately 10% fine sand; tan; moist; firm.

76.0 to 78.0 ft. POORLY LITHIFIED SILTSTONE (sltst): Poorly lithified Siltstone (sltst) classified as Sandy Silt s(ML): Approximately 60% nonplastic fines; approximately 40% fine sand;

brown; wet; very soft.

78.0 to 79.8 ft. POORLY LITHIFIED SANDSTONE (ss): Poorly lithified Sandstone (ss) classified as silty sand (ML)s: Approximately 70% fine to coarse, angular sand; approximately 30% nonplastic fines; light brown; wet; soft.

Lab Results:

77.0 to 78.5 ft - Silty Sand: 23.0% Fines;

77% Sand. LL=NA, PL=NA, PI=NP, M=18.9%

79.8 to 80.1 ft. POORLY LITHIFIED SILTSTONE (sltst): Poorly lithified Siltstone (sltst) classified as sandy silt s(ML): Approximately 70% nonplastic fines; approximately 30% fine sand; dark brown;

wet; very soft.

Lab Results:

79.8 to 80.1 ft - Sandy Silt: 58.0% Fines;

42% Sand. LL=NA, PL=NA, PI=NP, M=32.0%

80.1 to 80.8 ft. POORLY LITHIFIED SANDSTONE (ss): Poorly lithified Sandstone (ss) classified as silty sand s(ML): Approximately 70% fine to coarse, angular sand; approximately 30% nonplastic fines; light brown; wet; soft.

80.8 to 81.0 ft. POORLY LITHIFIED SILTSTONE (sltst): Poorly lithified Siltstone (ss) classified as sandy silt s(ML): Approximately 70% low plasticity fines; approximately 30% fine sand;

brown and black; wet; very soft.

81.0 to 85.0 ft. POORLY LITHIFIED SANDSTONE (ss): Poorly lithified Sandstone (ss) classified as silty sand s(ML): Approximately 60% fine sand;

approximately 40% nonplastic fines; medium plasticity fines from 83.5 to 84.5 ft.; brown; wet;

soft.

Lab Results:

At 82.0 ft - M=25.6% At 84.5 ft - M=26.0%

85.0 to 90.5 ft. INTENSELY WEATHERED CLAYSTONE (clyst): Intensely weathered Claystone (W7) classified as sandy lean clay s(CL): Approximately 70% low plasticity fines;

approximately 30% fine sand; brown; wet;

very soft.

Lab Results:

87.0 to 88.5 ft - Sandy Silt: 58.0% Fines;

42% Sand. LL=21.0, PL=18.3, PI=2.7, M=26.7%

CLASSIFICATION AND

NOTES

SHEET 4 OF 5

GROUND ELEVATION: 2541.5COORDINATES:

STATE: Montana

D E

P T

PHYSICAL CONDITION

DEPTH AND ELEV OF WATER

G E

O L.

U N

Y M

S P

W S

/F T

LEVEL AND DATE MEASURED: 11/4/15 / 11/8/15

O R

E R

E C

O V

E R

PROJECT: Fresno

ANGLE FROM HORIZONTAL: AZIMUTH:

S /L

GEOLOGIC LOG OF DRILL HOLE: SPT15-06

FEATURE: Fresno Dam

DEPTH TO BEDROCK: 30.0

LOCATION: Station 17+50.3 ft. Offset -227.7 Toe of Dam

BEGUN: 10/25/15 FINISHED: 11/7/15 TOTAL DEPTH: 131.5

HOLE LOGGED BY: C. Clark

REVIEWED BY: K. Scannella

F R

E S

N O

P J

L O

G _2

.G D

90.5 to 93.5 ft. INTENSELY WEATHERED CLAYSTONE (clyst): Intensely weathered Claystone (W7) classified as lean clay with sand (CL)s: Approximately 80% medium plasticity fines; approximately 20% fine sand;

brown; moist; moderately soft.

Lab Results:

92.0 to 93.5 ft - Lean Clay: 92.0% Fines;

8% Sand. LL=29.3, PL=19.6, PI=9.7, M=29.4%

93.5 to 94.5 ft. POORLY LITHIFIED SILTSTONE (sltst): Poorly lithified Siltstone (sltst) classified as sandy silt s(ML): Approximately 70% low plasticity to nonplastic fines; gray to tan;

wet; soft.

94.5 to 96.0 ft. POORLY LITHIFIED SANDSTONE (ss): Poorly lithified Sandstone (ss) classified as silty sand (SM): Approximately 60% fine sand; approximately 40% nonplastic and low plasticity fines; brown; wet; very soft.

96.0 to 102.5 ft. POORLY LITHIFIED SANDSTONE (ss): Poorly lithified Sandstone (ss) classified as silty sand (SM): Approximately 60% fine sand; approximately 40% nonplastic fines;

brown; wet; very soft; roots and organics throughout.

102.5 to 107.5 ft. POORLY LITHIFIED SANDSTONE (ss): Poorly lithified Sandstone (ss) classified as silty sand (SM): Approximately 80% fine sand;

approximately 20% nonplastic fines; brown; wet;

very soft.

107.5 to 112.5 ft. NO SAMPLE RECOVERED

112.5 to 121.5 ft. POORLY LITHIFIED SANDSTONE (ss): Poorly lithified Sandstone (ss) classified as silty sand (SM): Approximately 85% fine sand;

approximately 15% nonplastic fines; brown;

wet; very soft.

121.5 to 131.5 ft. - INTENSELY WEATHERED CLAYSTONE (clyst): Intensely weathered Claystone (W7) classified as sandy lean clay s(CL): Approximately 85% low to medium plasticity fines; medium toughness;

approximately 15% fine sand; maximum size recovered, fine sand; medium gray; light brown mottled; weak reaction with HCL.

CLASSIFICATION AND

NOTES

SHEET 5 OF 5

GROUND ELEVATION: 2541.5COORDINATES:

STATE: Montana

D E

P T

PHYSICAL CONDITION

DEPTH AND ELEV OF WATER

G E

O L.

U N

Y M

S P

W S

/F T

LEVEL AND DATE MEASURED: 11/4/15 / 11/8/15

O R

E R

E C

O V

E R

PROJECT: Fresno

ANGLE FROM HORIZONTAL: AZIMUTH:

S /L

GEOLOGIC LOG OF DRILL HOLE: SPT15-06

FEATURE: Fresno Dam

DEPTH TO BEDROCK: 30.0

LOCATION: Station 17+50.3 ft. Offset -227.7 Toe of Dam

BEGUN: 10/25/15 FINISHED: 11/7/15 TOTAL DEPTH: 131.5

HOLE LOGGED BY: C. Clark

REVIEWED BY: K. Scannella

F R

E S

N O

P J

L O

G _2

.G D

fill

Qal

Kjr

0 to 23.0 ft. FILL

0.0 to 23.0 ft. - CENTERBITTED: Little to no cuttings were recovered during drill hole advancement.

Materials were described as silty sand (SM) based on limited cutting returns.

23.0 to 33.0 ft. QUATERNARY ALLUVIUM (Qal)

23.0 to 27.0 ft. - CENTERBITTED: Little to no cuttings were recovered during drill hole advancement. Materials were described as poorly graded sand (SP) based on limited cutting returns.

27.0 to 33.0 ft. POORLY GRADED SAND (SP):

Approximately 95% very fine to medium, subrounded to subangular sand; approximately 5% nonplastic fines; maximum size recovered, medium sand; wet; loose; medium gray; medium to strong reaction with HCl.

Lab Results:

32.0 to 33.5 ft - Silty Sand: 13.0% Fines;

87% Sand. LL=NA, PL=NA, PI=NP, M=22.8%

33.0 to 36.0 ft. CRETACEOUS JUDITH RIVER FORMATION (Kjr)

33.0 to 36.0 ft. POORLY LITHIFIED SANDSTONE (ss): Poorly lithified Sandstone (ss) classified as poorly graded sand (SP): Approximately 95% fine to medium, subrounded to subangular sand;

maximum size recovered, medium sand;

approximately 5% low plasticity fines as laminations; wet; very loose; medium gray;

trace black organics; strong reaction with HCl.

BOTTOM OF HOLE

(SM)

(SP)

(ss)

LOCATION:

Station 13+00.3 ft., offset -227.5 at toe of dam.

PURPOSE OF HOLE:

Centerbit surface to 27.0 ft to calibrate rig hammer.

DRILLING EQUIPMENT:

Truck mounted T3W rotary drill rig; 4-1/4

in. I.D. Hollow Stem Augers (HSA) with split sample barrel and hex rods. CME 140 lb automatic hammer.

DRILLING METHODS:

Centerbit surface to 27.0 ft to calibrate rig.

27.0 ft. to 36.0 ft.- continuous SPT's.

DRILLER:

S. Rafferty (USBR)

DRILLING/ GEOLOGY COMMENTS:

While advancing beyond the water table, the hole was filled to ground surface with water in order to lower pressures to decrease heaving sands.

WATER LEVELS:

9/10/15 24.0 ft.

HOLE COMPLETION:

(9/10/15) Backfilled hole with bentonite to surface.

COMMENTS:

Drilled to 27.0 ft. total depth to calibrate Ingersoll Rand T3W rig. Started SPTs and samples from 27.0 ft.

CLASSIFICATION AND

NOTES

SHEET 1 OF 1

GROUND ELEVATION: 2542.2COORDINATES:

STATE: Montana

D E

P T

PHYSICAL CONDITION

DEPTH AND ELEV OF WATER

G E

O L.

U N

Y M

S P

W S

/F T

LEVEL AND DATE MEASURED: 24.0 (2518.20) 9/10/2015

O R

E R

E C

O V

E R

PROJECT: Fresno

ANGLE FROM HORIZONTAL: AZIMUTH:

S /L

GEOLOGIC LOG OF DRILL HOLE: SPT15-07

FEATURE: Fresno Dam

DEPTH TO BEDROCK: 33.0

LOCATION: Station 13+00.3 ft. Offset -227.5 Toe of Dam

BEGUN: 9/10/15 FINISHED: 9/10/15 TOTAL DEPTH: 36.0

HOLE LOGGED BY: K. Roccoforte

REVIEWED BY: K. Scannella

F R

E S

N O

P J

L O

G _2

.G D

/1 fill

Qal

Kjr

0.0 to 23.0 ft. FILL

0.0 to 23.0 ft. - CENTERBITTED: Little to no cuttings were recovered during drill hole advancement.

Materials were described as silty sand (SM) based on limited cutting returns.

23.0 to 33.0 ft. QUATERNARY ALLUVIUM (Qal)

23.0 to 33.0 ft. - CENTERBITTED: Little to no cuttings were recovered during drill hole advancement. Materials were described as poorly graded sand (SP) based on limited cutting returns.

33.0 to 99.5 ft. CRETACEOUS JUDITH RIVER FORMATION (Kjr)

33.0 to 36.0 ft. POORLY LITHIFIED SANDSTONE (ss): Poorly lithified Sandstone (ss) classified as poorly graded sand (SP): Approximately 100% fine to coarse sand; maximum size recovered, coarse sand from 35.9 to 36.0 ft.;

wet; loose; medium to dark gray; brown; strong reaction with HCl.

36.0 to 60.5 ft. POORLY LITHIFIED SANDSTONE (ss): Poorly lithified Sandstone (ss) classified as poorly graded sand (SP): Approximately 95% fine to medium sand; maximum size recovered, medium sand; approximately 5% nonplastic fines; trace medium plasticity lean clay nodules;

wet; loose; medium to dark gray; brown; trace black organics; trace shell fragments; strong reaction with HCl.

Lab Results:

40.0 to 41.5 ft - Poorly Graded Sand With Silt:

11.0% Fines; 89% Sand. LL=NA, PL=NA, PI=NP, M=29.3%

52.5 to 54.0 ft - Silty Sand: 18.0% Fines;

82% Sand. LL=NA, PL=NA, PI=NP, M=31.0%

60.0 to 61.5 ft - Silty Sand: 30.0% Fines;

70% Sand. LL=NA, PL=NA, PI=NP, M=26.9%

60.5 to 66.5 ft. NO RECOVERY- HEAVING SANDS

(SM)

(SP)

(ss)

LOCATION:

Station 12+75.3 ft., offset -228.6 at toe of dam.

PURPOSE OF HOLE:

DRILLING EQUIPMENT:

Truck mounted CME-85 rotary drill rig;

4-1/4 in. I.D. Hollow Stem Augers (HSA); 5 ft. long, 3 in. I.D. split-tube sample barrel; 3.8 ft. long, 1-3/8 in. I.D.

SPT barrel; NWJ rods; CME 140 lb automatic hammer.

DRILLER:

Sean Rafferty; USBR

DRILLING METHODS:

0.0 ft. to 35.0 ft. Centerbit to calibrate rig.

35.0 ft. to 76.5 ft.- Continuous SPT's, clean out intervals with 4-1/4 in. I.D.

HSA with 5 ft. long split-tube sample barrel.

76.5 to 99.5 ft. - Advanced drill hole with 4-1/4 in. I.D. HSA with 5 ft. long split-tube sample barrel to collect overcore samples.

DRILLING/ GEOLOGY COMMENTS:

While advancing beyond the water table, the hole was filled to ground surface with water in order to lower pressures to decrease heaving sands.

44.0 to 47.5 ft. - Material very loose within sample interval; no recovery.

Continued next pageCOMMENTS:

Drilled to 35.0 ft. total depth to calibrate CME-85 rig. Started SPTs and sampling from 35.0 ft.

CLASSIFICATION AND

NOTES

SHEET 1 OF 2

GROUND ELEVATION: 2542.3COORDINATES:

STATE: Montana

D E

P T

PHYSICAL CONDITION

DEPTH AND ELEV OF WATER

G E

O L.

U N

Y M

S P

W S

/F T

LEVEL AND DATE MEASURED: 24.0 (2518.30) 9/11/2015

O R

E R

E C

O V

E R

PROJECT: Fresno

ANGLE FROM HORIZONTAL: AZIMUTH:

S /L

GEOLOGIC LOG OF DRILL HOLE: SPT15-07A

FEATURE: Fresno Dam

DEPTH TO BEDROCK: 33.0

LOCATION: Station 12+75.3 ft. Offset -228.6 Toe of Dam

BEGUN: 9/10/15 FINISHED: 9/12/15 TOTAL DEPTH: 99.5

HOLE LOGGED BY: K. Roccoforte

REVIEWED BY: K. Scannella

F R

E S

N O

P J

L O

G _2

.G D

Kjr

66.5…

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File details come from the government source that posted it. Updated Sep 20, 2022.