Att_03_00_00_02A_Dwgs-B_G1-G26_TetonDamOverlook_11x17_04-29-2024_0001.pdf

PDF 2 MB Posted Dec 9, 2024

Attached to: Teton Dam 50th Commemoration Overlook Project
Solicitation number: 140R1025B0002
Issued by: Department of the Interior Bureau of Reclamation

About this file

Written by GovTribe AI · Dec 10, 2024

This file contains a set of geologic logs and test pit logs documenting subsurface investigations at the Teton Dam Overlook site. The logs detail drilling results from multiple test holes (TH-23-01 through TH-23-10) and test pits (TP-23-1 through TP-23-12) conducted in December 2023, along with soil classification charts and laboratory testing data.

The logs document subsurface conditions including soil types, rock properties, and groundwater conditions. Key findings show the presence of rhyolite bedrock underlying fill materials and loess deposits. The soil samples were tested for grain size distribution, Atterberg limits, and other physical properties. Sample depths ranged from surface to approximately 10 feet deep. Notable materials encountered include sandy silts, gravelly clays, and weathered rhyolite bedrock. The data includes detailed descriptions of soil composition, weathering conditions, hardness, and other geotechnical properties that would be relevant for engineering design and construction planning at the overlook site.

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FAPB

SPT

BOTTOM OF HOLE: T.D. 5.9 ft. (el. 5304.1)

W6H5

Note:

Rock properties, including but not limited to, rock quality designation, fracture density, hardness, and weathering in rock core are presented below.

Fracture properties (orientation, spacing, openness, fillings, healing, surfaces, etc.) are described on the attached tables.

0.0 to 4.4 ft.: NO RECOVERY

4.4 to 4.9 ft.

FILL/RHYOLITE BOULDERS

Placed fill consisting of mostly reddish-brown rhyolite boulders, which have characteristics similar to rhyolite bedrock, but differs in color and has clayey/silty soil infilling in void space between boulders.

4.4 to 4.9 ft.: FILL, RHYOLITE BOULDER:

Reddish brown, fine-grained; intensely to moderately weathered (W6); moderately soft (H5), can be grooved by knife or sharp pick with moderate or heavy pressure.

LABORATORY TEST DATA FOR SAMPLE FROM

INTERVAL 4.4 to 5.9': Gravel 22.7%, Sand 27.1%, Fines 50.2%, %LL=27, %PI=24, Laboratory classification of sample is SANDY SILT WITH GRAVEL, s(ML)g.

*Sample was taken from entire SPT interval from

4.4 to 5.9'

4.9 to 5.7 ft.

PLEISTOCENE LOESS (Qel)

Massive, light gray to light brownish gray silt, clay, and very fine sand. Thickness generally 2 to >5 m (6.5 to >16 ft). Derived from deflation by dominantly southwest winds of silty sediment from outwash deposits during glaciation of the Snake River headwaters.

4.9 to 5.7 ft.: LEAN SILT, ML:

About 90% fines with low plasticity, low toughness, rapid dilatancy; about 10% fine to coarse, hard, angular sand; trace fine, hard, angular to subangular gravel; maximum size, 1/4 inch; dry; brown.

5.7 to 5.9 ft.

PLEISTOCENE HUCKLEBERRY RIDGE TUFF

(Qyh) Compound cooling unit of crystal-rich welded rhyolitic ash-flow tuff erupted from the Henrys Fork Caldera of the Yellowstone Plateau. Major phenocrysts are sanidine and quartz, with sparse plagioclase and pyroxene. Phenocrysts are abundant (20-30 percent) in lower part of unit, becoming smaller and less numerous (<5 percent) near the top. Most of the unit is composed of light-gray to grayish-pink densely welded devitrified tuff with well-developed eutaxitic texture. A weathering horizon consisting of about 2-10 m (6.5-33 ft) of red clay and partially decomposed tuff is locally present on top of the Huckleberry Ridge Tuff.

5.7 to 5.9 ft.: RHYOLITE:

Gray, fine-grained; intensely to moderately weathered (W6); moderately soft (H5), can be grooved by knife or sharp pick with moderate or heavy pressure.

ALL MEASUREMENTS ARE IN FEET

FROM GROUND SURFACE

PURPOSE OF DRILL HOLE:

Use FADC and SPT to collect soil samples for site characterization.

LOCATION:

Overlook

DRILLED BY:

Bureau of Reclamation: PN Region Drill Crew Dan Read, driller Pepper Bead, helper

DRILL RIG:

CME 45

DRILLING METHODS:

0.0-5.9': Advanced hole with 4.25-inch hollow stem augers (HSA) using a combination of a pilot bit and flight auger dry core (FADC) sampler.

Sampled with SPT on designated intervals as indicated below along with the corresponding blows for three 0.5' intervals.

0.0-4.4': FAPB

4.4-5.9': SPT 7/6/11

DRILLING CONDITIONS AND

DRILLER'S COMMENTS:

0.0 to 0.8': Piloted just past the asphalt 0.8': Tried the dry core barrel and got immediate refusal, put in the pilot again

0.8 to 5.9': Ground is very hard and compacted with rock 4.4': Pilot bit refusal at 4.4 ft

4.4 to 5.9': Verified with an SPT

DEPTH TO WATER:

Dry: 12/16/2023

HOLE COMPLETION:

0.0 to 0.3': Asphalt Patch

0.3 to 5.9': Bentonite Chips

Notes

H ar d n es s

W ea th er in g

Rock Properties

H o le C o m p le ti o n

G eo lo g ic U n it an d

S ym b o l Visual Classification and Physical Condition

D ep th fe et

R ec o ve ry

D ri ll in g M et h o d

S am p le

I D

V is u al

C la ss if ic at io n

L ab

C la ss if ic ai to n

S P

PROJECT:

STATE: Idaho

LOCATION:

GEOLOGIC LOG OF DRILL HOLE NO. TH-23-01 SHEET 1 OF 1

RECLAMATION

FEATURE:

COMMENTS

Overlook Characterization & Evaluation DATUM: State Plane Idaho East FIPS 1101

Managing Water in the West

TOTAL DEPTH: 5.9 ft. (el. 5304.1 ft.)

LOGGED BY: R. Carroll

REVIEWED BY: A BrusakOverlook

START DATE, END DATE: 12/16/2023, 12/16/2023

R A

R Y

E T

O N

D A

M O

V E

O K

E P

O R

_R O

C K

A T

E M

T E

W O

O D

E R

T E

P R

E D

Teton Dam Overlook

ANGLE FROM HORIZONTAL: -90o

COORDINATES: N 821230 E 816422

GROUND ELEVATION: 5310 ft.

Center column descriptors are defined in the Reclamation Engineering Geology Field manual, Volume 1, Second Edition, 1998.

The HSA size is 6.25-inch which cuts an outside diameter of 11-inches and provides a 6-inch diameter dry core.

FADC - Flight Auger Dry Core FAPB - Flight Auger Pilot Bit FT - foot/feet '% Recovery - Core Recovery Percentage HCl - Hydrochloric Acid LL - Liquid Limit

PSI - Pounds per Square Inch PI - Plasticity Index NA - Not Applicable/Available NP - Non-Plastic NR - No Recovery TD - Total Depth

WATER LEVEL DEPTH, DATE: Dry

87 1

Fill

Qel

Qyh

Asphalt

Fill/Boulder

Rhyolite

17 s(ML)g

FADC

FAPB

FADC

SPT

BOTTOM OF HOLE: T.D. 10.9 ft. (el. 5317.1)

Note:

Rock properties, including but not limited to, rock quality designation, fracture density, hardness, and weathering in rock core are presented below.

0.0 to 0.7 ft.: NO RECOVERY

0.7 to 0.9 ft.

FILL/RHYOLITE BOULDERS

0.7 to 0.9 ft.: FILL, RHYOLITE BOULDER:

Reddish-brown; moderately weathered (W5);

moderately hard (H4), can be scratched with knife or sharp pick with light or moderate pressure;

fine-grained; soil infilling.

0.9 to 4.4 ft.: NO RECOVERY

4.4 to 10.9 ft.

PLEISTOCENE HUCKLEBERRY RIDGE TUFF

4.4 to 10.9 ft.: RHYOLITE:

Gray; intensely weathered (W7); fine-grained;

degraded with soil infilling from 9.4 to 10.9 feet.

Hardness

4.4 to 9.4 ft.: moderately soft (H5), can be grooved 1/16 inch (2 mm) deep by knife or sharp pick with moderate or heavy pressure.

9.4 to 10.9 ft.: soft (H6), can be grooved or gouged easily by knife or sharp pick with light pressure, can be scratched with fingernail.

ALL MEASUREMENTS ARE IN FEET

FROM GROUND SURFACE

PURPOSE OF DRILL HOLE:

Use FADC and SPT to collect soil samples for site characterization.

LOCATION:

Overlook Walkway Top

DRILLED BY:

Bureau of Reclamation: PN Region Drill Crew Dan Read, driller Pepper Bead, helper

DRILL RIG:

CME 45

DRILLING METHODS:

0.0-10.9': Advanced hole with 4.25-inch hollow stem augers (HSA) using a combination of a pilot bit and flight auger dry core (FADC) sampler.

Sampled with SPT on designated intervals as indicated below along with the corresponding blows for three 0.5' intervals.

0.0-0.7': FAPB

0.7-0.9': FADC

0.9-4.4': FAPB

4.4-9.4': FADC

9.4-10.9': SPT 14/20/19

DRILLING CONDITIONS AND

DRILLER'S COMMENTS:

0.0 to 0.7': Piloted just past the asphalt.

0.7 to 0.9': Dry core barrel refusal

0.9 to 4.4': Piloted to 4.4 ft seemed a little different like less rock

4.4 to 9.4': Dry core to 9.4 and retrieved a sample of broken and weathered Rhyolite rock

9.4 to 10.9': Verified with an SPT

DEPTH TO WATER:

Dry: 12/16/2023

HOLE COMPLETION:

0.0 to 0.3': Asphalt Patch

0.3 to 10.9': Bentonite Chips

Notes

H ar d n es s

W ea th er in g

Rock Properties

H o le C o m p le ti o n

G eo lo g ic U n it an d

S ym b o l Visual Classification and Physical Condition

D ep th fe et

R ec o ve ry

D ri ll in g M et h o d

S am p le

I D

V is u al

C la ss if ic at io n

L ab

C la ss if ic ai to n

S P

PROJECT:

STATE: Idaho

LOCATION:

GEOLOGIC LOG OF DRILL HOLE NO. TH-23-02 SHEET 1 OF 1

RECLAMATION

FEATURE:

COMMENTS

Overlook Characterization & Evaluation DATUM: State Plane Idaho East FIPS 1101

Managing Water in the West

TOTAL DEPTH: 10.9 ft. (el. 5317.1 ft.)

LOGGED BY: R. Carroll

REVIEWED BY: A BrusakOverlook Walkway Top

START DATE, END DATE: 12/16/2023, 12/16/2023

R A

R Y

E T

O N

D A

M O

V E

O K

O R

_R O

C K

A T

E M

T E

W O

O D

E R

T E

P R

E D

Teton Dam Overlook

ANGLE FROM HORIZONTAL: -90o

COORDINATES: N 821289 E 816335

GROUND ELEVATION: 5328 ft.

Center column descriptors are defined in the Reclamation Engineering Geology Field manual, Volume 1, Second Edition, 1998.

The HSA size is 6.25-inch which cuts an outside diameter of 11-inches and provides a 6-inch diameter dry core.

FADC - Flight Auger Dry Core FAPB - Flight Auger Pilot Bit FT - foot/feet '% Recovery - Core Recovery Percentage HCl - Hydrochloric Acid LL - Liquid Limit

PSI - Pounds per Square Inch PI - Plasticity Index NA - Not Applicable/Available NP - Non-Plastic NR - No Recovery TD - Total Depth

WATER LEVEL DEPTH, DATE: Dry

Fill

Qyh

Asphalt

Fill/Boulder

FAPB

FADC

SPT

BOTTOM OF HOLE: T.D. 10.9 ft. (el. 5313.1)

W5H5

Note:

Rock properties, including but not limited to, rock quality designation, fracture density, hardness, and weathering in rock core are presented below.

0.0 to 2.8 ft.: NO RECOVERY

2.8 to 10.9 ft.

PLEISTOCENE HUCKLEBERRY RIDGE TUFF

2.8 to 4.3 ft.: RHYOLITE:

Gray; moderately soft (H5), can be grooved 1/16 inch (2 mm) deep by knife or sharp pick with moderate or heavy pressure; moderately weathered (W5).

4.3 to 4.7 ft.: NO RECOVERY

4.7 to 10.9 ft.: RHYOLITE:

Gray; moderately soft (H5), can be grooved 1/16 inch (2 mm) deep by knife or sharp pick with moderate or heavy pressure; moderately weathered (W5); fractured with soil infilling, (GM)s.

ALL MEASUREMENTS ARE IN FEET

FROM GROUND SURFACE

PURPOSE OF DRILL HOLE:

Use FADC and SPT to collect soil samples for site characterization.

LOCATION:

Northeast Lower Parking Lot

DRILLED BY:

Bureau of Reclamation: PN Region Drill Crew Dan Read, driller Pepper Bead, helper

DRILL RIG:

CME 45

DRILLING METHODS:

0.0-10.9': Advanced hole with 4.25-inch hollow stem augers (HSA) using a combination of a pilot bit and flight auger dry core (FADC) sampler.

Sampled with SPT on designated intervals as indicated below along with the corresponding blows for three 0.5' intervals.

0.0-2.8': FAPB

2.8-4.3': SPT 9/9/7

4.3-4.7': FAPB

4.7-9.4': FADC

9.4-10.9': SPT 23/16/7

DRILLING CONDITIONS AND

DRILLER'S COMMENTS:

2.8': Lexan refusal

DEPTH TO WATER:

Dry: 12/14/2023

HOLE COMPLETION:

0.0 to 0.3': Asphalt Patch

0.3 to 10.9': Bentonite Chips

Notes

H ar d n es s

W ea th er in g

Rock Properties

H o le C o m p le ti o n

G eo lo g ic U n it an d

S ym b o l Visual Classification and Physical Condition

D ep th fe et

R ec o ve ry

D ri ll in g M et h o d

S am p le

I D

V is u al

C la ss if ic at io n

L ab

C la ss if ic ai to n

S P

PROJECT:

STATE: Idaho

LOCATION:

GEOLOGIC LOG OF DRILL HOLE NO. TH-23-04 SHEET 1 OF 1

RECLAMATION

FEATURE:

COMMENTS

Overlook Characterization & Evaluation DATUM: State Plane Idaho East FIPS 1101

Managing Water in the West

TOTAL DEPTH: 10.9 ft. (el. 5313.1 ft.)

LOGGED BY: R. Carroll

REVIEWED BY: A BrusakNortheast Lower Parking Lot

START DATE, END DATE: 12/14/2023, 12/14/2023

R A

R Y

E T

O N

D A

M O

V E

O K

O R

_R O

C K

A T

E M

T E

W O

O D

E R

T E

P R

E D

Teton Dam Overlook

ANGLE FROM HORIZONTAL: -90o

COORDINATES: N 821368 E 816386

GROUND ELEVATION: 5324 ft.

Center column descriptors are defined in the Reclamation Engineering Geology Field manual, Volume 1, Second Edition, 1998.

The HSA size is 6.25-inch which cuts an outside diameter of 11-inches and provides a 6-inch diameter dry core.

FADC - Flight Auger Dry Core FAPB - Flight Auger Pilot Bit FT - foot/feet '% Recovery - Core Recovery Percentage HCl - Hydrochloric Acid LL - Liquid Limit

PSI - Pounds per Square Inch PI - Plasticity Index NA - Not Applicable/Available NP - Non-Plastic NR - No Recovery TD - Total Depth

WATER LEVEL DEPTH, DATE: Dry

Qyh

Asphalt

Rhyolite

BOTTOM OF HOLE: T.D. 2.3 ft. (el. 5325.7)

W6H5

Note:

Rock properties, including but not limited to, rock quality designation, fracture density, hardness, and weathering in rock core are presented below.

0.0 to 0.8 ft.: NO RECOVERY

0.8 to 1.2 ft.

FILL/RHYOLITE BOULDERS

0.8 to 1.2 ft.: FILL, RHYOLITE BOULDER:

1.2 to 1.8 ft.

PLEISTOCENE LOESS (Qel)

1.2 to 1.8 ft.: CLAYEY SAND, SC:

About 45% medium to coarse, hard, subangular to subrounded sand; about 45% fines with low plasticity, slow dilatancy; about 10% fine, hard, angular gravel; maximum size, 1/2 inch; dry;

brown.

LABORATORY TEST DATA FOR SAMPLE FROM

INTERVAL 0.8 to 2.3': Gravel 14.3%, Sand 50.8%, Fines 34.9%, %LL=NA, %PI=NP, Laboratory classification of sample is SILTY

SAND, SM.

*Sample was taken for entire SPT sample interaval from 0.8 to 2.3'

1.8 to 2.3 ft.

PLEISTOCENE HUCKLEBERRY RIDGE TUFF

1.8 to 2.3 ft.: RHYOLITE:

Gray; moderately soft (H5), can be grooved 1/16 inch (2 mm) deep by knife or sharp pick with moderate or heavy pressure; intensely to moderately weathered (W6); fine to medium grained.

ALL MEASUREMENTS ARE IN FEET

FROM GROUND SURFACE

PURPOSE OF DRILL HOLE:

Use FADC and SPT to collect soil samples for site characterization.

LOCATION:

Southeast Lower Parking Lot

DRILLED BY:

Bureau of Reclamation: PN Region Drill Crew Dan Read, driller Pepper Bead, helper

DRILL RIG:

CME 45

DRILLING METHODS:

0.0-2.3': Advanced hole with 4.25-inch hollow stem augers (HSA) using a combination of a pilot bit and flight auger dry core (FADC) sampler.

Sampled with SPT on designated intervals as indicated below along with the corresponding blows for three 0.5' intervals.

0.0-0.8': FAPB

0.8-2.3': SPT 6/17/30

DRILLING CONDITIONS AND

DRILLER'S COMMENTS:

0.0 to 0.8': Augured just past the asphalt and hit refusal at .8 ft with the pilot bit.

0.8 to 1.5': Verified with an SPT

DEPTH TO WATER:

Dry: 12/15/2023

HOLE COMPLETION:

0.0 to 0.3': Asphalt Patch

0.3 to 2.3': Bentonite Chips

Notes

H ar d n es s

W ea th er in g

Rock Properties

H o le C o m p le ti o n

G eo lo g ic U n it an d

S ym b o l Visual Classification and Physical Condition

D ep th fe et

R ec o ve ry

D ri ll in g M et h o d

S am p le

I D

V is u al

C la ss if ic at io n

L ab

C la ss if ic ai to n

S P

PROJECT:

STATE: Idaho

LOCATION:

GEOLOGIC LOG OF DRILL HOLE NO. TH-23-05 SHEET 1 OF 1

RECLAMATION

FEATURE:

COMMENTS

Overlook Characterization & Evaluation DATUM: State Plane Idaho East FIPS 1101

Managing Water in the West

TOTAL DEPTH: 2.3 ft. (el. 5325.7 ft.)

LOGGED BY: R. Carroll

REVIEWED BY: A BrusakSoutheast Lower Parking Lot

START DATE, END DATE: 12/15/2023, 12/15/2023

R A

R Y

E T

O N

D A

M O

V E

O K

O R

_R O

C K

A T

E M

T E

W O

O D

E R

T E

P R

E D

Teton Dam Overlook

ANGLE FROM HORIZONTAL: -90o

COORDINATES: N 821502 E 816372

GROUND ELEVATION: 5328 ft.

Center column descriptors are defined in the Reclamation Engineering Geology Field manual, Volume 1, Second Edition, 1998.

The HSA size is 6.25-inch which cuts an outside diameter of 11-inches and provides a 6-inch diameter dry core.

FADC - Flight Auger Dry Core FAPB - Flight Auger Pilot Bit FT - foot/feet '% Recovery - Core Recovery Percentage HCl - Hydrochloric Acid LL - Liquid Limit

PSI - Pounds per Square Inch PI - Plasticity Index NA - Not Applicable/Available NP - Non-Plastic NR - No Recovery TD - Total Depth

WATER LEVEL DEPTH, DATE: Dry

93 1

Fill

Qel

Qyh

Asphalt

Fill/Boulder

47 SM

SPT

BOTTOM OF HOLE: T.D. 5.3 ft. (el. 5328.7)

W6H5

Note:

Rock properties, including but not limited to, rock quality designation, fracture density, hardness, and weathering in rock core are presented below.

0.0 to 1.7 ft.: NO RECOVERY

1.7 to 3.8 ft.

PLEISTOCENE LOESS (Qel)

1.7 to 3.8 ft.: SILT WITH SAND, (ML)s:

About 80% fines with low plasticity, low toughness, rapid dilatancy; about 20% fine to medium sand; trace fine to coarse, hard, angular gravel; maximum size, 1 inch; dry; light brown.

3.8 to 5.3 ft.

PLEISTOCENE HUCKLEBERRY RIDGE TUFF

3.8 to 5.3 ft.: RHYOLITE:

Reddish brown; intensely to moderately weathered (W6); moderately soft (H5), can be grooved 1/16 inch (2 mm) deep by knife or sharp pick with moderate or heavy pressure; white, fibrous mineral intrusion pockets.

LABORATORY TEST DATA FOR SAMPLE FROM

INTERVAL 3.8 to 5.3': Gravel 10.8%, Sand 18.4%, Fines 70.8%, %LL=29, %PL=21, Laboratory classification of sample is LEAN CLAY WITH SAND (CL)s.

*Sample depth was mislabeled and was likely from material from SPT sample 1.7 to 3.8' not 3.8 to 5.3'

ALL MEASUREMENTS ARE IN FEET

FROM GROUND SURFACE

PURPOSE OF DRILL HOLE:

Use FADC and SPT to collect soil samples for site characterization.

LOCATION:

Road Between Upper and Lower Parking Lots

DRILLED BY:

Bureau of Reclamation: PN Region Drill Crew Dan Read, driller Pepper Bead, helper

DRILL RIG:

CME 45

DRILLING METHODS:

0.0-5.3': Advanced hole with 4.25-inch hollow stem augers (HSA) using a combination of a pilot bit and flight auger dry core (FADC) sampler.

Sampled with SPT on designated intervals as indicated below along with the corresponding blows for three 0.5' intervals.

0.0-1.7': FAPB

1.7-3.8': FADC

3.8-5.3': SPT 13/17/40

DRILLING CONDITIONS AND

DRILLER'S COMMENTS:

0.0 to 3.8': Augured, got just passed the asphalt and put in the Dry core barrel got to 3.8 ft and hit refusal.

3.8 to 5.3': Verified with SPT, all rhyolite, hard packed

DEPTH TO WATER:

Dry: 12/15/2023

HOLE COMPLETION:

0.0 to 0.3': Asphalt Patch

0.3 to 5.3': Bentonite Chips

Notes

H ar d n es s

W ea th er in g

Rock Properties

H o le C o m p le ti o n

G eo lo g ic U n it an d

S ym b o l Visual Classification and Physical Condition

D ep th fe et

R ec o ve ry

D ri ll in g M et h o d

S am p le

I D

V is u al

C la ss if ic at io n

L ab

C la ss if ic ai to n

S P

PROJECT:

STATE: Idaho

LOCATION:

GEOLOGIC LOG OF DRILL HOLE NO. TH-23-06 SHEET 1 OF 1

RECLAMATION

FEATURE:

COMMENTS

Overlook Characterization & Evaluation DATUM: State Plane Idaho East FIPS 1101

Managing Water in the West

TOTAL DEPTH: 5.3 ft. (el. 5328.7 ft.)

LOGGED BY: R. Carroll

REVIEWED BY: A BrusakRoad Between Upper and Lower Parking Lots

START DATE, END DATE: 12/15/2023, 12/15/2023

R A

R Y

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D A

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O K

O R

_R O

C K

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W O

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E R

T E

P R

E D

Teton Dam Overlook

ANGLE FROM HORIZONTAL: -90o

COORDINATES: N 821627 E 816311

GROUND ELEVATION: 5334 ft.

Center column descriptors are defined in the Reclamation Engineering Geology Field manual, Volume 1, Second Edition, 1998.

The HSA size is 6.25-inch which cuts an outside diameter of 11-inches and provides a 6-inch diameter dry core.

FADC - Flight Auger Dry Core FAPB - Flight Auger Pilot Bit FT - foot/feet '% Recovery - Core Recovery Percentage HCl - Hydrochloric Acid LL - Liquid Limit

PSI - Pounds per Square Inch PI - Plasticity Index NA - Not Applicable/Available NP - Non-Plastic NR - No Recovery TD - Total Depth

WATER LEVEL DEPTH, DATE: Dry

Qel

Qyh

Asphalt

(ML)s

Rhyolite57

(CL)s

SPT

FAPB

SPT

BOTTOM OF HOLE: T.D. 6.3 ft. (el. 5322.7)

W3H4

Note:

Rock properties, including but not limited to, rock quality designation, fracture density, hardness, and weathering in rock core are presented below.

0.0 to 1.5 ft.: NO RECOVERY

1.5 to 3.0 ft.

FILL/RHYOLITE BOULDERS

1.5 to 3.0 ft.: FILL, RHYOLITE BOULDER:

Reddish brown; moderately soft (H5), can be grooved 1/16 inch (2 mm) deep by knife or sharp pick with moderate or heavy pressure; intensely weathered (W7); fine to medium grained.

3.0 to 4.8 ft.: NO RECOVERY

4.8 to 6.3 ft.

PLEISTOCENE HUCKLEBERRY RIDGE TUFF

4.8 to 6.3 ft.: RHYOLITE:

Gray; moderately hard (H4), can be scratched with knife or sharp pick with light or moderate pressure; slightly weathered (W3); fine grained;

trace soil infilling.

ALL MEASUREMENTS ARE IN FEET

FROM GROUND SURFACE

PURPOSE OF DRILL HOLE:

Use FADC and SPT to collect soil samples for site characterization.

LOCATION:

West Lower Parking Lot

DRILLED BY:

Bureau of Reclamation: PN Region Drill Crew Dan Read, driller Pepper Bead, helper

DRILL RIG:

CME 45

DRILLING METHODS:

0.0-6.3': Advanced hole with 4.25-inch hollow stem augers (HSA) using a combination of a pilot bit and flight auger dry core (FADC) sampler.

Sampled with SPT on designated intervals as indicated below along with the corresponding blows for three 0.5' intervals.

0.0-1.2': FAPB

1.2-1.5': FADC

1.5-3.0': SPT 15/7/13

3.0-4.8': FAPB

4.8-6.3': SPT 7/5/13

DRILLING CONDITIONS AND

DRILLER'S COMMENTS:

0.0 to 6.3': Broken up bedrock, couldnt get a sample with the augers but managed to with an SPT

DEPTH TO WATER:

Dry: 12/14/2023

HOLE COMPLETION:

0.0 to 0.3': Asphalt Patch

0.3 to 6.3': Bentonite Chips

Notes

H ar d n es s

W ea th er in g

Rock Properties

H o le C o m p le ti o n

G eo lo g ic U n it an d

S ym b o l Visual Classification and Physical Condition

D ep th fe et

R ec o ve ry

D ri ll in g M et h o d

S am p le

I D

V is u al

C la ss if ic at io n

L ab

C la ss if ic ai to n

S P

PROJECT:

STATE: Idaho

LOCATION:

GEOLOGIC LOG OF DRILL HOLE NO. TH-23-07 SHEET 1 OF 1

RECLAMATION

FEATURE:

COMMENTS

Overlook Characterization & Evaluation DATUM: State Plane Idaho East FIPS 1101

Managing Water in the West

TOTAL DEPTH: 6.3 ft. (el. 5322.7 ft.)

LOGGED BY: R. Carroll

REVIEWED BY: A BrusakWest Lower Parking Lot

START DATE, END DATE: 12/14/2023, 12/14/2023

R A

R Y

E T

O N

D A

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V E

O K

O R

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W O

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E R

T E

P R

E D

Teton Dam Overlook

ANGLE FROM HORIZONTAL: -90o

COORDINATES: N 821291 E 816283

GROUND ELEVATION: 5329 ft.

Center column descriptors are defined in the Reclamation Engineering Geology Field manual, Volume 1, Second Edition, 1998.

The HSA size is 6.25-inch which cuts an outside diameter of 11-inches and provides a 6-inch diameter dry core.

FADC - Flight Auger Dry Core FAPB - Flight Auger Pilot Bit FT - foot/feet '% Recovery - Core Recovery Percentage HCl - Hydrochloric Acid LL - Liquid Limit

PSI - Pounds per Square Inch PI - Plasticity Index NA - Not Applicable/Available NP - Non-Plastic NR - No Recovery TD - Total Depth

WATER LEVEL DEPTH, DATE: Dry

Fill

Qyh

Fill/Boulder

Rhyolite

SPT

FADC

SPT

BOTTOM OF HOLE: T.D. 5.7 ft. (el. 5339.3)

W6H5

Note:

Rock properties, including but not limited to, rock quality designation, fracture density, hardness, and weathering in rock core are presented below.

Fracture properties (orientation, spacing, openness, fillings, healing, surfaces, etc.) are described on the attached tables.

0.0 to 1.1 ft.: NO RECOVERY

1.1 to 3.1 ft.

FILL/RHYOLITE BOULDERS

1.1 to 1.5 ft.: LEAN SILT, ML:

About 90% fines with low plasticity, low toughness, rapid dilatancy; about 10% fine to coarse, hard, angular to subangular sand; trace fine, hard gravel; maximum size, 1/4 inch; dry;

brown.

1.5 to 2.6 ft.: FILL, RHYOLITE BOULDER:

Reddish brown; moderately hard (H4), can be scratched with knife or sharp pick with light or moderate pressure; moderately weathered (W5);

fine to medium grained.

2.6 to 4.7 ft.

PLEISTOCENE LOESS (Qel)

2.6 to 5.4 ft.: LEAN SILT, ML:

About 90% fines with low plasticity, low toughness, rapid dilatancy; about 10% fine to coarse, hard, angular to subangular sand; trace fine, hard gravel; maximum size, 1/4 inch; dry;

brown.

5.4 to 5.7 ft.

PLEISTOCENE HUCKLEBERRY RIDGE TUFF

5.4 to 5.7 ft.: RHYOLITE:

Tan to gray; moderately soft (H5), can be grooved 1/16 inch (2 mm) deep by knife or sharp pick with moderate or heavy pressure; intensely to moderately weathered (W6); fine grained.

ALL MEASUREMENTS ARE IN FEET

FROM GROUND SURFACE

PURPOSE OF DRILL HOLE:

Use FADC and SPT to collect soil samples for site characterization.

LOCATION:

North Upper Parking Lot

DRILLED BY:

Bureau of Reclamation: PN Region Drill Crew Dan Read, driller Pepper Bead, helper

DRILL RIG:

CME 45

DRILLING METHODS:

0.0-5.7': Advanced hole with 4.25-inch hollow stem augers (HSA) using a combination of a pilot bit and flight auger dry core (FADC) sampler.

Sampled with SPT on designated intervals as indicated below along with the corresponding blows for three 0.5' intervals.

0.0-1.1': FAPB

1.1-1.6': FADC

1.6-3.1': SPT 14/13/9

3.1-4.7': FADC

4.7-5.7': SPT 4/17/23R @ 5.7'

DRILLING CONDITIONS AND

DRILLER'S COMMENTS:

0.0': hit refusal at less than a foot moved over and tried again.

1.1 to 1.6': Switched over to the dry core an almost immediately got refusal.

DEPTH TO WATER:

Dry: 12/17/2023

HOLE COMPLETION:

0.0 to 0.5': Native Fill

0.5 to 5.7': Bentonite Chips

Notes

H ar d n es s

W ea th er in g

Rock Properties

H o le C o m p le ti o n

G eo lo g ic U n it an d

S ym b o l Visual Classification and Physical Condition

D ep th fe et

R ec o ve ry

D ri ll in g M et h o d

S am p le

I D

V is u al

C la ss if ic at io n

L ab

C la ss if ic ai to n

S P

PROJECT:

STATE: Idaho

LOCATION:

GEOLOGIC LOG OF DRILL HOLE NO. TH-23-08 SHEET 1 OF 1

RECLAMATION

FEATURE:

COMMENTS

Overlook Characterization & Evaluation DATUM: State Plane Idaho East FIPS 1101

Managing Water in the West

TOTAL DEPTH: 5.7 ft. (el. 5339.3 ft.)

LOGGED BY: R. Carroll

REVIEWED BY: A BrusakNorth Upper Parking Lot

START DATE, END DATE: 12/17/2023, 12/17/2023

R A

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T E

P R

E D

Teton Dam Overlook

ANGLE FROM HORIZONTAL: -90o

COORDINATES: N 821488 E 816044

GROUND ELEVATION: 5345 ft.

Center column descriptors are defined in the Reclamation Engineering Geology Field manual, Volume 1, Second Edition, 1998.

The HSA size is 6.25-inch which cuts an outside diameter of 11-inches and provides a 6-inch diameter dry core.

FADC - Flight Auger Dry Core FAPB - Flight Auger Pilot Bit FT - foot/feet '% Recovery - Core Recovery Percentage HCl - Hydrochloric Acid LL - Liquid Limit

PSI - Pounds per Square Inch PI - Plasticity Index NA - Not Applicable/Available NP - Non-Plastic NR - No Recovery TD - Total Depth

WATER LEVEL DEPTH, DATE: Dry

Fill

Qel

Qyh

Fill/Boulder

Rhyolite

40R

BOTTOM OF HOLE: T.D. 2.0 ft. (el. 5351.0)

Note:

Rock properties, including but not limited to, rock quality designation, fracture density, hardness, and weathering in rock core are presented below.

0.0 to 1.2 ft.: NO RECOVERY

1.2 to 1.7 ft.

FILL/RHYOLITE BOULDERS

1.2 to 1.7 ft.: FILL, RHYOLITE BOULDER:

Reddish brown; moderately soft (H5), can be grooved 1/16 inch (2 mm) deep by knife or sharp pick with moderate or heavy pressure; intensely weathered (W7); fine grained.

1.7 to 2.0 ft.

PLEISTOCENE HUCKLEBERRY RIDGE TUFF

1.7 to 1.9 ft.: RHYOLITE DECOMPOSED:

Gray; very soft (H7), can be readily indented, grooved, or gouged with fingernail, or carved with a knife;

decomposed (W9).

1.9 to 2.0 ft.: RHYOLITE:

Gray; moderately soft (H5), can be grooved 1/16 inch (2 mm) deep by knife or sharp pick with moderate or heavy pressure; intensely weathered (W7); fine grained.

ALL MEASUREMENTS ARE IN FEET

FROM GROUND SURFACE

PURPOSE OF DRILL HOLE:

Use FADC and SPT to collect soil samples for site characterization.

LOCATION:

Middle Upper Parking Lot

DRILLED BY:

Bureau of Reclamation: PN Region Drill Crew Dan Read, driller Pepper Bead, helper

DRILL RIG:

CME 45

DRILLING METHODS:

0.0-2.0': Advanced hole with 4.25-inch hollow stem augers (HSA) using a combination of a pilot bit and flight auger dry core (FADC) sampler.

Sampled with SPT on designated intervals as indicated below along with the corresponding blows for three 0.5' intervals.

0.0-1.2': FAPB

1.2-2.0': SPT 28/50R @ 2.0'

DRILLING CONDITIONS AND

DRILLER'S COMMENTS:

0.0 to 1.2 ft.: Refusal at 1.2 ft

1.2 to 2.0': SPT verified bedrock

DEPTH TO WATER:

Dry: 12/17/2023

HOLE COMPLETION:

0.0 to 0.5': Native Fill

0.5 to 2.0': Bentonite Chips

Notes

H ar d n es s

W ea th er in g

Rock Properties

H o le C o m p le ti o n

G eo lo g ic U n it an d

S ym b o l Visual Classification and Physical Condition

D ep th fe et

R ec o ve ry

D ri ll in g M et h o d

S am p le

I D

V is u al

C la ss if ic at io n

L ab

C la ss if ic ai to n

S P

PROJECT:

STATE: Idaho

LOCATION:

GEOLOGIC LOG OF DRILL HOLE NO. TH-23-09 SHEET 1 OF 1

RECLAMATION

FEATURE:

COMMENTS

Overlook Characterization & Evaluation DATUM: State Plane Idaho East FIPS 1101

Managing Water in the West

TOTAL DEPTH: 2.0 ft. (el. 5351.0 ft.)

LOGGED BY: R. Carroll

REVIEWED BY: A BrusakMiddle Upper Parking Lot

START DATE, END DATE: 12/17/2023, 12/17/2023

R A

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P R

E D

Teton Dam Overlook

ANGLE FROM HORIZONTAL: -90o

COORDINATES: N 821588 E 815895

GROUND ELEVATION: 5353 ft.

Center column descriptors are defined in the Reclamation Engineering Geology Field manual, Volume 1, Second Edition, 1998.

The HSA size is 6.25-inch which cuts an outside diameter of 11-inches and provides a 6-inch diameter dry core.

FADC - Flight Auger Dry Core FAPB - Flight Auger Pilot Bit FT - foot/feet '% Recovery - Core Recovery Percentage HCl - Hydrochloric Acid LL - Liquid Limit

PSI - Pounds per Square Inch PI - Plasticity Index NA - Not Applicable/Available NP - Non-Plastic NR - No Recovery TD - Total Depth

WATER LEVEL DEPTH, DATE: Dry

80 1

Fill

Qyh

Fill/Boulder

Decomposed Rhyolite

50R

SPT

FAPB

SPT

Note:

Rock properties, including but not limited to, rock quality designation, fracture density, hardness, and weathering in rock core are presented below.

Fracture properties (orientation, spacing, openness, fillings, healing, surfaces, etc.) are described on the attached tables.

0.0 to 1.1 ft.: NO RECOVERY

1.1 to 5.7 ft.

FILL/RHYOLITE BOULDERS

1.1 to 1.2 ft.: SANDY LEAN CLAY WITH GRAVEL, s(CL)g:

About 50% fines with low plasticity, low toughness, slow dilatancy; about 35% fine to coarse, hard, angular sand; about 15% fine, hard, angular to subangular gravel; maximum size, 1/4 inch; dry.

1.2 to 1.8 ft.: FILL, RHYOLITE BOULDER:

Reddish brown; moderately soft (H5), can be grooved 1/16 inch (2 mm) deep by knife or sharp pick with moderate or heavy pressure; moderately weathered (W5); fine grained.

1.8 to 2.0 ft.: FILL, RHYOLITE BOULDER:

Light tan; soft (H6), can be grooved or gouged easily by knife or sharp pick with light pressure, can be scratched with fingernail; intensely weathered (W7); fine grained.

2.0 to 2.7 ft.: LEAN SILT, ML:

About 90% fines with low plasticity, low toughness, rapid dilatancy; about 10% fine to coarse, hard, angular to subangular sand; trace fine, hard gravel; maximum size, 1/4 inch; dry;

brown.

2.7 to 4.5 ft.: NO RECOVERY

4.5 to 4.7 ft.: LEAN SILT, ML:

About 90% fines with low plasticity, low toughness, rapid dilatancy; about 10% fine to coarse, hard, angular to subangular sand; trace fine, hard gravel; maximum size, 1/4 inch; dry;

brown.

4.7 to 5.3 ft.: FILL, RHYOLITE BOULDER:

Reddish brown; moderately soft (H5), can be grooved 1/16 inch (2 mm) deep by knife or sharp pick with moderate or heavy pressure; moderately weathered (W5); fine grained.

5.3 to 5.7 ft.: FILL, RHYOLITE BOULDER:

Light tan; soft (H6), can be grooved or gouged easily by knife or sharp pick with light pressure, can be scratched with fingernail; intensely weathered (W7); fine grained.

5.7 to 6.0 ft.

PLEISTOCENE HUCKLEBERRY RIDGE TUFF

ALL MEASUREMENTS ARE IN FEET

FROM GROUND SURFACE

PURPOSE OF DRILL HOLE:

Use FADC and SPT to collect soil samples for site characterization.

LOCATION:

South Upper Parking Lot

DRILLED BY:

Bureau of Reclamation: PN Region Drill Crew Dan Read, driller Pepper Bead, helper

DRILL RIG:

CME 45

DRILLING METHODS:

0.0-6.0': Advanced hole with 4.25-inch hollow stem augers (HSA) using a combination of a pilot bit and flight auger dry core (FADC) sampler.

Sampled with SPT on designated intervals as indicated below along with the corresponding blows for three 0.5' intervals.

0.0-1.1': FAPB

1.1-1.2': FADC

1.2-2.7': SPT 10/9/10

2.7-4.5': FAPB

4.5-6.0': SPT 10/24/20

DRILLING CONDITIONS AND

DRILLER'S COMMENTS:

0.0 to 1.1': Ground is hard

1.1 to 1.2': FADC got almost immediate refusal.

4.5 to 6.0': SPT verified Rhyolite rock at 5.7 ft

DEPTH TO WATER:

Dry: 12/18/2023

HOLE COMPLETION:

0.0 to 6.0': Native Fill

Notes

H ar d n es s

W ea th er in g

Rock Properties

H o le C o m p le ti o n

G eo lo g ic U n it an d

S ym b o l Visual Classification and Physical Condition

D ep th fe et

R ec o ve ry

D ri ll in g M et h o d

S am p le

I D

V is u al

C la ss if ic at io n

L ab

C la ss if ic ai to n

S P

PROJECT:

STATE: Idaho

LOCATION:

GEOLOGIC LOG OF DRILL HOLE NO. TH-23-10 SHEET 1 OF 2

RECLAMATION

FEATURE:

COMMENTS

Overlook Characterization & Evaluation DATUM: State Plane Idaho East FIPS 1101

Managing Water in the West

TOTAL DEPTH: 6.0 ft. (el. 5348.0 ft.)

LOGGED BY: R. Carroll

REVIEWED BY: A BrusakSouth Upper Parking Lot

START DATE, END DATE: 12/18/2023, 12/18/2023

R A

R Y

E T

O N

D A

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O K

O R

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E R

T E

P R

E D

Teton Dam Overlook

ANGLE FROM HORIZONTAL: -90o

COORDINATES: N 821569 E 815769

GROUND ELEVATION: 5354 ft.

Center column descriptors are defined in the Reclamation Engineering Geology Field manual, Volume 1, Second Edition, 1998.

The HSA size is 6.25-inch which cuts an outside diameter of 11-inches and provides a 6-inch diameter dry core.

FADC - Flight Auger Dry Core FAPB - Flight Auger Pilot Bit FT - foot/feet '% Recovery - Core Recovery Percentage HCl - Hydrochloric Acid LL - Liquid Limit

PSI - Pounds per Square Inch PI - Plasticity Index NA - Not Applicable/Available NP - Non-Plastic NR - No Recovery TD - Total Depth

WATER LEVEL DEPTH, DATE: Dry

FILL

s(CL)g

Fill/Boulder

BOTTOM OF HOLE: T.D. 6.0 ft. (el. 5348.0)

H5 eutaxitic texture. A weathering horizon consisting of about 2-10 m (6.5-33 ft) of red clay and partially decomposed tuff is locally present on top of the Huckleberry Ridge Tuff.

5.7 to 6.0 ft.: RHYOLITE DECOMPOSED:

Gray; very end of sample less than 0.1' was tan non-decomposed rhyolite bedrock.

Hardness

5.7 to 5.9': Very soft (H7), can be readily indented, grooved, or gouged with fingernail, or carved with a knife;

5.9-6.0': Moderately soft (H5), can be grooved 1/16 inch (2 mm) deep by knife or sharp pick with moderate or heavy pressure

Weathering

5.7 to 5.9': Decomposed (W9) 5.9-6.0': Intensely weathered (W7)

Notes

H ar d n es s

W ea th er in g

Rock Properties

H o le C o m p le ti o n

G eo lo g ic U n it an d

S ym b o l Visual Classification and Physical Condition

D ep th fe et

R ec o ve ry

D ri ll in g M et h o d

S am p le

I D

V is u al

C la ss if ic at io n

L ab

C la ss if ic ai to n

S P

PROJECT:

STATE: Idaho

LOCATION:

GEOLOGIC LOG OF DRILL HOLE NO. TH-23-10 SHEET 2 OF 2

RECLAMATION

FEATURE:

COMMENTS

Overlook Characterization & Evaluation DATUM: State Plane Idaho East FIPS 1101

Managing Water in the West

TOTAL DEPTH: 6.0 ft. (el. 5348.0 ft.)

LOGGED BY: R. Carroll

REVIEWED BY: A BrusakSouth Upper Parking Lot

START DATE, END DATE: 12/18/2023, 12/18/2023

R A

R Y

E T

O N

D A

M O

V E

O K

O R

_R O

C K

A T

E M

T E

W O

O D

E R

T E

P R

E D

Teton Dam Overlook

ANGLE FROM HORIZONTAL: -90o

COORDINATES: N 821569 E 815769

GROUND ELEVATION: 5354 ft.

Center column descriptors are defined in the Reclamation Engineering Geology Field manual, Volume 1, Second Edition, 1998.

The HSA size is 6.25-inch which cuts an outside diameter of 11-inches and provides a 6-inch diameter dry core.

FADC - Flight Auger Dry Core FAPB - Flight Auger Pilot Bit FT - foot/feet '% Recovery - Core Recovery Percentage HCl - Hydrochloric Acid LL - Liquid Limit

PSI - Pounds per Square Inch PI - Plasticity Index NA - Not Applicable/Available NP - Non-Plastic NR - No Recovery TD - Total Depth

WATER LEVEL DEPTH, DATE: Dry

100 3

FILL

Qyh

Fill/Boulder

Decomposed Rhyolite

Feature: Teton Dam Project:

Location:

Coordinates:

Cat Backhoe 302

Datum:

R. Vanderplas

15.0 x 5.0 x 5.0 ft.

0.0 to 5.0 ft.

5.0 ft.

NOTES

TP-23-1

Overlook Characterization & Evaluation

Ground Elevation: 5311 ft.

Bureau Of Reclamation TEST PIT LOG Hole No.

Backfilled with native material and compacted with excavator.

Coordinates and elevation are approximate and should not be used for design

PLUS 12

INCH

(GM) scb

0.0 to 5.0 ft.: SILTY GRAVEL WITH SAND, COBBLES AND BOULDERS, (GM)scb:

About 45% non-plastic fines; about 40% fine to coarse, hard, angular gravel; about 15% fine sand; maximum size, 30 inches; dry; dark reddish brown; about 30% (by volume) 3- to 5-inch, moderately hard, angular cobbles, about 20% (by volume) 5- to 12-inch, moderately hard, angular cobbles, about 10% (by volume), moderately hard, angular boulders; rhyolite cobbles/gravels; roots/wood present ; strong reaction with HCl.

IN-PLACE CONDITION: One 5-gallon bucket and one bagged sample collected.

LAB TEST DATA: Gravel 34.8%, Sand 13%, Fines 52.2%, %LL=32, %PI=25, Laboratory classification of sample is GRAVELLY SILT, g(ML).

30 20 10

FIELD

CLASSIFICATION

GROUP SYMBOL

CLASSIFICATION AND DESCRIPTION OF MATERIAL (SEE USBR 5000,5005)

% PLUS 3-INCH

BY VOLUME

3-5

INCH

5-12

INCH

Rhyolite

5.0 ft.: RHYOLITE:

Dark gray; hard; fine to coarse grained; calcite present on some broken surfaces; refusal with bucket at approximately 5.0 feet.

GEOLOGIC INTERPRETATION: Bedrock

N/A N/A N/A

East Side of Outlook

X Y

NAD 1983 (2011) State Plane Idaho East FIPS 1101 (US Feet)

Water Encountered: N/A Approx. Dimensions: Date Of Exploration: 12/14/2023

Logged By:

821265 816437 Method of Exploration:

Coordinates:

Cat Backhoe 302

Datum:

R. Vanderplas

Total Depth: 3.0 ft.

0.0 to 1.5 ft.

1.5 to 3.0 ft.

NOTES

TP-23-2

Overlook Characterization & Evaluation

Ground Elevation: 5311 ft.

Bureau Of Reclamation TEST PIT LOG Hole No.

Backfilled with native material and compacted with excavator.

Coordinates and elevation are approximate and should not be used for design

PLUS 12

INCH

s(ML)gc

0.0 to 1.5 ft.: SANDY LEAN SILT WITH GRAVEL AND COBBLES, s(ML)gc:

About 55% non-plastic fines; about 30% fine to coarse, soft, subangular sand; about 15% fine to coarse, subangular gravel; dry; dark reddish brown; about 10% (by volume) 3- to 5-inch cobbles; about 5% (by volume) 5- to 12-inch cobbles; strong reaction with HCl.

IN-PLACE CONDITION: One 5-gallon bucket and one bagged sample collected.

10 5 0

FIELD

CLASSIFICATION

GROUP SYMBOL

CLASSIFICATION AND DESCRIPTION OF MATERIAL (SEE USBR 5000,5005)

% PLUS 3-INCH

BY VOLUME

3-5

INCH

5-12

INCH

Rhyolite

1.5 to 3.0 ft.: RHYOLITE:

Dark gray; moderately hard; blocky; refusal with excavator at approximately 3.0 feet.

GEOLOGIC INTERPRETATION: Bedrock

N/A N/A N/A

East Side of Outlook

X Y

NAD 1983 (2011) State Plane Idaho East FIPS 1101 (US Feet)

Water Encountered: N/A Approx. Dimensions: Date Of Exploration: 12/14/2023

821267 816407 Method of Exploration:

Coordinates:

Cat Backhoe 302

Datum:

R. Vanderplas

12.0 x 2.0 x 2.2 ft.

0.0 to 1.5 ft.

1.5 to 2.2 ft.

NOTES

TP-23-3

Overlook Characterization & Evaluation

Ground Elevation: 5320 ft.

Bureau Of Reclamation TEST PIT LOG Hole No.

Backfilled with native material and compacted with excavator.

Coordinates and elevation are approximate and should not be used for design

PLUS 12

INCH

(ML)sc

0.0 to 1.5 ft.: LEAN SILT WITH SAND AND COBBLES, (ML)sc:

About 65% non-plastic fines; about 25% predominately fine with medium sand; about 10% fine to coarse, hard, angular to subangular gravel; maximum size, 5 inches; very soft consistency; dry; dark reddish brown; trace (by volume) 3- to 5-inch cobbles; roots and wood present; strong reaction with HCl.

IN-PLACE CONDITION: One 5-gallon bucket and one bagged sample collected.

LAB TEST DATA: Gravel 23.1%, Sand 15.8%, Fines 61.1%, %LL=32, %PI=27, Laboratory classification of sample is GRAVELLY SILT WITH SAND, g(ML)s. trace 0 0

FIELD

CLASSIFICATION

GROUP SYMBOL

CLASSIFICATION AND DESCRIPTION OF MATERIAL (SEE USBR 5000,5005)

% PLUS 3-INCH

BY VOLUME

3-5

INCH

5-12

INCH

Rhyolite

1.5 to 2.2 ft.: RHYOLITE:

Light to dark gray; intensely to moderately weathered (W6); moderately hard (H4), can be scratched with knife or sharp pick with light or moderate pressure, to moderately soft (H5), can be grooved by knife or sharp pick with moderate or heavy pressure; very intensely fractured (FD9); slightly blocky; moderately bedded.

GEOLOGIC INTERPRETATION: Bedrock N/A N/A N/A

West Side of Outlook

X Y

NAD 1983 (2011) State Plane Idaho East FIPS 1101 (US Feet)

Water Encountered: N/A Approx. Dimensions: Date Of Exploration: 12/15/2023

821232 816384 Method of Exploration:

Coordinates:

Cat Backhoe 302

Datum:

R. Vanderplas

Depth: 2.8 ft., Width: 2.0 ft.

0.0 to 1.8 ft.

1.8 to 2.8 ft.

NOTES

TP-23-4

Overlook Characterization & Evaluation

Ground Elevation: 5325 ft.

Bureau Of Reclamation TEST PIT LOG Hole No.

Backfilled with native material and compacted with excavator.

Coordinates and elevation are approximate and should not be used for design

PLUS 12

INCH

(ML)sc

0.0 to 1.8 ft.: LEAN SILT WITH SAND AND COBBLES, (ML)sc:

About 65% non-plastic fines; about 25% fine to coarse, subangular sand; about 10% fine to coarse, angular to subangular gravel; maximum size, 5 inches; dry; dark reddish brown;

about 10% (by volume) 3- to 5-inch, soft to hard, angular cobbles; strong reaction with HCl.

IN-PLACE CONDITION: One 5-gallon bucket and one bagged sample collected.

LAB TEST DATA: Cobble 9.9%, Gravel 39.8%, Sand 23.3%, Fines 27%, %LL=32, %PI=28, Laboratory classification of sample is SILTY GRAVEL WITH SAND AND COBBLES, (GM)sc. 10 0 0

FIELD

CLASSIFICATION

GROUP SYMBOL

CLASSIFICATION AND DESCRIPTION OF MATERIAL (SEE USBR 5000,5005)

% PLUS 3-INCH

BY VOLUME

3-5

INCH

5-12

INCH

Rhyolite

1.8 to 2.8 ft.: RHYOLITE:

pinkish gray to light gray; intensely to moderately weathered (W6); moderately hard (H4), can be scratched with knife or sharp pick with light or moderate pressure, to moderately soft (H5), can be grooved by knife or sharp pick with moderate or heavy pressure; very intensely fractured (FD9); slightly blocky; moderately bedded; excavates/breaks with moderate pressure with bucket excavator; no reaction to HCl.

GEOLOGIC INTERPRETATION: Bedrock N/A N/A N/A

West Side of Outlook

X Y

NAD 1983 (2011) State Plane Idaho East FIPS 1101 (US Feet)

Water Encountered: N/A Approx. Dimensions: Date Of Exploration: 12/15/2023

821463 816353 Method of Exploration:

Coordinates:

Cat Backhoe 302

Datum:

R. Carroll

13.0 x 2.0 x 1.5 ft.

0.0 to 1.3 ft.

1.3 to 1.5 ft.

NOTES

TP-23-5

Overlook Characterization & Evaluation

Ground Elevation: 5330 ft.

Bureau Of Reclamation TEST PIT LOG Hole No.

Backfilled with native material and compacted with excavator.

Coordinates and elevation are approximate and should not be used for design

PLUS 12

INCH

(SC)g

0.0 to 1.3 ft.: CLAYEY SAND WITH GRAVEL: (SC)g:

About 50% medium to coarse, hard, subangular, to subrounded sand; about 30% low plasticity, slow dilatancy fines; about 20% fine, hard, angular to subangular gravel;

maximum size, 1/4 inch; trace organics in top 0.5 feet, roots; brown; dry.

IN-PLACE CONDITION: One 5-gallon bucket collected.

0 0 0

FIELD

CLASSIFICATION

GROUP SYMBOL

CLASSIFICATION AND DESCRIPTION OF MATERIAL (SEE USBR 5000,5005)

% PLUS 3-INCH

BY VOLUME

3-5

INCH

5-12

INCH

Rhyolite

1.3 to 1.5 ft.: RHYOLITE

GEOLOGIC INTERPRETATION: Bedrock

N/A N/A N/A

East Side of Lower Parking Lot

X Y

NAD 1983 (2011) State Plane Idaho East FIPS 1101 (US Feet)

Water Encountered: N/A Approx. Dimensions: Date Of Exploration: 12/13/2023

821463 816319 Method of Exploration:

Coordinates:

Cat Backhoe 302

Datum:

R. Vanderplas

15.0 x 2.0 x 3.2 ft.

0.0 to 2.3 ft.

2.3 to 3.2 ft.

NOTES

TP-23-6

Overlook Characterization & Evaluation

Ground Elevation: 5333 ft.

Bureau Of Reclamation TEST PIT LOG Hole No.

Backfilled with native material and compacted with excavator.

Coordinates and elevation are approximate and should not be used for design

PLUS 12

INCH

(CL)sgc

0.0 to 2.3 ft.: LEAN CLAY WITH SAND, GRAVEL AND COBBLES, (CL)sgc:

About 60% fines with low plasticity, low toughness; about 20% fine to medium sand;

about 20% fine to coarse, angular to subangular gravel; maximum size, 5 inches; soft, loose consistency; dry; brown; about 10% (by volume) 3- to 5-inch, moderately soft to hard, angular to subangular cobbles; strong reaction with HCl.

IN-PLACE CONDITION: One 5-gallon bucket and one bagged sample collected.

LAB TEST DATA: Cobble 5.4%, Gravel 11.4%, Sand 25.6%, Fines 57.6%, %LL=28, %PI=21, Laboratory classification of sample is LEAN CLAY TO SILT WITH GRAVEL AND COBBLES, (CL- ML)gc.

10 0 0

FIELD

CLASSIFICATION

GROUP SYMBOL

CLASSIFICATION AND DESCRIPTION OF MATERIAL (SEE USBR 5000,5005)

% PLUS 3-INCH

BY VOLUME

3-5

INCH

5-12

INCH

Rhyolite

2.3 to 3.2 ft.: RHYOLITE:

Reddish brown; intensely weathered (W7); moderately soft (H5), can be grooved by knife or sharp pick with moderate or heavy pressure; very intensely to intensely fractured (FD8); moderately bedded; excvates with moderate pressure from excavator; no reaction to HCl.

GEOLOGIC INTERPRETATION: Bedrock N/A N/A N/A

West Side of Road Between Parking Lots

X Y

NAD 1983 (2011) State Plane Idaho East FIPS 1101 (US Feet)

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File details come from the government source that posted it. Updated Dec 9, 2024.