Attachment_0008_-_Final_Geotech_Investigation_Results_with_Appendices_(1).pdf

FEBRUARY 24, 2024

Final Geotechnical Investigation Results

INTRODUCTION

This memorandum provides geotechnical investigation results for the Conant Bank Stabilization Project being performed for the Bureau of Land Management (BLM) in Bonneville County, Idaho. The project stationing referenced in this report is from the 30% Design Set, dated May 02, 2023.

The geotechnical scope of work for this project included a visual reconnaissance along the proposed alignment and a subsurface investigation program consisting of two test pits. The test pits were completed by Western Federal Lands Highway Division (WFL) in coordination with a BLM operator. Laboratory testing was completed by WFL.

This memorandum was prepared to provide geotechnical investigation results for the two test pits completed on November 2nd, 2023, and laboratory testing from samples obtained from the test pits to inform design of a new parking area.

PROJECT DESCRIPTION

The Conant Boat Access is located on the South Fork of the Snake River (SFSR) in Bonneville County, Idaho (Figure 1). It is a public boat launch managed by the BLM and consists of a primary paved parking area with a concrete boat ramp and a secondary paved parking area for rafts and smaller recreational watercraft. This site provides essential recreational access and serves approximately 200,000 visitors per year.

Figure 1 Project and Test Pit Location Map

Bank erosion has been occurring along the west bank of the river at this site. This bank erosion has made raft shoreline access and launching unsafe and is causing sediment deposition at the concrete boat ramp. Ongoing bank erosion is anticipated and expected to impact more upland BLM infrastructure with time.

The Conant Bank Stabilization project consists of stabilizing the west bank of the SFSR between the South

Fork Lodge and the Boat Ramp at the Conant Boat Access and a parking area expansion at the Conant Boat Ramp Parking.

SCOPING REPORT AND FIELD RECONNAISSANCE

During the scoping trip in October of 2020 (Geotechnical Scoping Memorandum) soil observed on site in the exposed cut bank were interpreted as alluvium (river transported) and are described as fine sandy SILT to silty fine SAND with underlying GRAVELS and COBBLES. Based on the field review of the river cut banks and geologic mapping published by Jobin & Schroeder (Geotechnical Scoping Memorandum), basalt bedrock is possible at shallow depths in the upland areas within the BLM managed portion of the project area but was not encountered in the test pits conducted in November of 2023.

Pritchard Creek’s confluence with the Snake River is directly upstream of the project site. Refer to Geotechnical Scoping Memorandum, for additional geology and site conditions of the project.

SUBSURFACE CONDITIONS

Two test pits were dug within the southern parking area along the SFSR. The locations of the test pits are shown in Figure 1 and Table 1. Bulk samples and moisture samples were collected in each stratum.

Table 1. Test Pit Approximate Locations

Coordinates

Test Pit Latitude (deg)

Longitude (deg)

TP23-01 43.463089 -111.428042

TP23-02 43.462592 -111.427939

Test pits were logged in the field by a WFL engineering geologist and geotechnical engineer. Disturbed soil samples were collected and delivered to WFL in Vancouver, Washington, where samples were reviewed by a WFL geotechnical engineer and engineering geologist. Following review, selected samples of soil were submitted to the WFL Materials Laboratory for testing. Final test boring logs were modified as necessary to reflect updated information from laboratory testing.

The FLH Soil Description and Identification Guidelines were used to characterize soil units encountered during drilling operations. The Unified Soil Classification System (USCS), as outlined in ASTM D2487 and ASTM D2488, were utilized in test pit logs and are based on distribution and behavior of fine-grained and coarse-grained soil constituents. Soil and rock descriptive terms and the USCS chart is provided in the Descriptive Terminology for Boring Logs at the beginning of Appendix A.

Test pit TP23-01 encountered moist, brown, SILT with gravel, cobble up to 4-inches, and roots between 0.0 to

1.6 feet below ground surface (bgs) overlying dry, brown lean CLAY with roots to 3.2 feet bgs. Moist, light brown SILT with sand was observed underly the lean CLAY to 5.4 feet bgs, where the test pit was terminated.

Test pit TP23-02 encountered moist, dark brown SILT with roots between 0.0 and 1.1 feet bgs overlying dry, brown to mottled black, lean CLAY with roots to 2.7 feet bgs. Dry, brown, SILT was encountered underlying the lean CLAY to 4.3 feet bgs, where the test pit was terminated.

Test pit walls were observed to stand up the entire time the test pits were open, approximately 15 minutes. No groundwater was observed at the time of our site visit within the project limits or within the test pits themselves. Test pit logs can be found in Appendix A.

LABORATORY MATERIALS TESTING

Laboratory test results were completed for select soil samples from the test pits. Laboratory tests consisted of soil testing to characterize subsurface materials and characterize engineering properties of soils that may be encountered during construction. The following is a list of tests that were completed on the selected soil samples and the standards that were followed:

• Particle Size Analysis – AASHTO T88

• Liquid Limit, Plastic Limit, and Plasticity Index – AASHTO T 89/90

• Natural Moisture – AASHTO T 265

• Apparent Specific Gravity – AASHTO T 100

• R-Value test – AASHTO T190

Table 2 provides a summary of the testing results:

Table 2 Testing Summary

BORING

NO.

FIELD

SAMPLE

NO.

SAMPLE

DEPTH

(ft) LL PL* PI Moisture

R value at 300 psi

Density at R value

(pcf)

Moisture at R value (%)

APPARENT

SPECIFIC

GRAVITY

TP23-01 G01 2.0 39 21 18 - 19 86.1 46.8 2.707

TP23-01 M01 0.7 - - - 13.9 - - - -

TP23-01 M02 5.2 - NP - 10.9 - - - -

TP23-02 G01 2.3 36 20 16 - - - - 2.627

TP23-02 M01 2.8 - - - 18.8 - - - -

TP23-02 M02 4 37 21 16 15.4 - - - -

Note:

*NP= Non Plastic

A full summary of laboratory testing can be found in Table B-1, along with individual sample laboratory test results provided in Appendix B.

LIMITATIONS

This memorandum was prepared to provide subsurface geotechnical investigation results for the Conant Bank Stabilization Project being performed for the BLM in Bonneville County, Idaho. It should be noted that the test pits might not represent potentially unfavorable subsurface conditions between the test pits. The observed water levels and/or conditions may vary considerably with time, according to the climate, rainfall, and other factors and are otherwise dependent on the duration of, and methods used in, and interpretations made from the subsurface geotechnical investigation program.

REFERENCES

Geotechnical Scoping Memorandum, April 2021.

Attachments:

Appendix A: Test Pit Logs Appendix B: Laboratory Testing Results

APPENDIX A

Test Pit Logs

Project Name: Conant Bank Restoration Project Location: Swan Valley, Idaho

Fracture Frequency (fractures per foot) Percent Passing No. 200 Sieve Liquid Limit (%) Non-Plastic Plastic Limit (%) Pocket Penetrometer Reading Rock Core Recovery Rock Quality Designation Specific Gravity Unconfined Compressive Strength Vibrating Wire Piezometer Water Content (%)

BORING LOG LEGEND

DRILLING METHOD SYMBOLS

SAMPLE TYPE SYMBOLS

Grab Sample

ABBREVIATIONS

FF

Fines

LL

NP

PL

PP

Rec

RQD

SG

UC

VWP

WC

U. S. DEPARTMENT OF TRANSPORTATION

FEDERAL HIGHWAY ADMINISTRATION

FEDERAL LANDS HIGHWAY DIVISION

F H

W A

B O

R

IN

G L

O G

L E

G E

N D

F

H W

A _D

A T

A T

E M

P

LA

T E

_2

.G

D T

/1 8/

:0

D :\C

O N

A N

T B

A N

K \C

O N

A N

T B

A N

K .G

P J

M01

GB-01

GB-02

M02

Fines = 94%

Fines = 74%

SILT with gravel, brown, moist, with clay, roots.

0.7 ft / El. 5269.3 ft SILT with gravel, very stiff to hard, brown, dry, subrounded to rounded, roots, cobbles up to 4".

1.6 ft / El. 5268.4 ft Lean CLAY (CL), hard, brown, dry, roots. A-6 (17)

Roots. R value: 19 Density @ R value: 86.1 pcf Moisture @ R value: 46.8 %

3.2 ft / El. 5266.8 ft Mottled with dark brown.

SILT with sand (ML), firm to stiff, light brown, moist, fine sand. A-4 (0)

5.4 ft / El. 5264.6 ft Bottom of test pit at 5.4 ft.

D ril lin g

M et ho d

Field Blow Count (Recovery)No.

T yp e

Test Results

SAMPLE

TP23-01

Sheet: 1 of 1

Project Location: Swan Valley, Idaho

20 40 60 80

PL LLWC

N VALUE

20 40 60 80

Project Name: Conant Bank Restoration

E le va tio n (f t)

D ep th ft)

MATERIAL DESCRIPTION

TEST PIT LOG

U. S. DEPARTMENT OF TRANSPORTATION

FEDERAL HIGHWAY ADMINISTRATION

FEDERAL LANDS HIGHWAY DIVISION

F H

W A

L O

G

F H

W A

_D A

T A

T E

M P

LA

T

E .G

D T

/1 8/

:2

D :\C

O N

A N

T B

A N

K \C

O N

A N

T B

A N

K .G

P J

Groundwater Depth:

Notes:

After Drilling: ---

While Drilling: --- At Completion: ---

South wall logged.

Surface Elevation: 5270 ft Date Started: 11/2/23 Date Completed: 11/2/23 Driller/Company:

Logger/Company: Leah Wilmot

Equipment Backhoe Approx. Excavation Dimensions: 2x6

G ra ph ic

L og

GB-01

M01

GB-02

M02

Fines = 91%

SILT, dark brown, moist, with roots.

1.1 ft / El. 5258.9 ft Lean CLAY (CL), very stiff, brown to mottled black, dry, rounded, some roots, and gravel. A-6 (14)

2.7 ft / El. 5257.3 ft SILT, stiff, brown, dry, trace roots.

4.3 ft / El. 5255.7 ft Bottom of test pit at 4.3 ft.

D ril lin g

M et ho d

Field Blow Count (Recovery)No.

T yp e

Test Results

SAMPLE

TP23-02

Sheet: 1 of 1

Project Location: Swan Valley, Idaho

20 40 60 80

PL LLWC

N VALUE

20 40 60 80

Project Name: Conant Bank Restoration

E le va tio n (f t)

D ep th ft)

MATERIAL DESCRIPTION

TEST PIT LOG

U. S. DEPARTMENT OF TRANSPORTATION

FEDERAL HIGHWAY ADMINISTRATION

FEDERAL LANDS HIGHWAY DIVISION

F H

W A

L O

G

F H

W A

_D A

T A

T E

M P

LA

T

E .G

D T

/1 8/

:2

D :\C

O N

A N

T B

A N

K \C

O N

A N

T B

A N

K .G

P J

Groundwater Depth:

Notes:

After Drilling: ---

While Drilling: --- At Completion: ---

South wall logged.

Surface Elevation: 5260 ft Date Started: 11/2/23 Date Completed: 11/2/23 Driller/Company:

Logger/Company: Leah Wilmot

Equipment Backhoe Approx. Excavation Dimensions: 2x6

G ra ph ic

L og

APPENDIX B

Table B‐1 Laboratory Testing Summary Laboratory Test Results

Table B-1 : Laboratory Testing Summary

50mm 37.5mm 25.0mm 19.0mm 12.5mm 9.5mm 4.75mm 2.00mm 425µm 150µm 75µm 20µm 10μm 5µm 2µm 2" 1.5" 1" 3/4" 1/2" 3/8" #4 #10 #40 #100 #200 20µm 10μm 5µm 2µm

ft. % % % % % % % % % % % % % % % % % % % TP23-01 G01 2.0 100.0 98.9 98.9 98.9 98.8 98.8 98.7 98.6 98.2 94.3 82.6 76.4 70.3 53.6 1.4 0.4 3.9 94.3 TP23-01 M02 5.2 - - - - - 100.0 100.0 100.0 100.0 98.0 74.1 - - - - 0.0 0.0 25.9 74.1 TP23-02 G01 2.3 - - - - - - 100.0 100.0 99.1 91.2 91.2 76.1 68.2 51.5 37.6 0.0 - - 92.1

SAMPLE

DEPTH LL PL* PI

ft. - - -

TP23-01 G01 2.0 39 21 18

TP23-01 M01 0.7 - - -

TP23-01 M02 5.2 - NP -

TP23-02 G01 2.3 36 20 16

TP23-02 M01 2.8 - - -

TP23-02 M02 4 37 21 16

Note:

*NP= Non Plastic

A-4 (0) A-6 (14)

15.4 ---- -

UNIFIED SOIL CLASSIFICATION

SYSTEM (USCS)

BORING

NO.

FIELD SAMPLE

NO.

Moisture

Lean Clay (CL)

Silt with Sand (ML) Lean Clay (CL)

AASHTO

CLASSIFICATION

A-6 (17)

Density at R value pcf

R value at 300 psi

PARTICLE SIZE

APPARENT SPECIFIC

GRAVITYMoisture at R value

SILT-CLAY

SAMPLE

DEPTHBORING

NO.

FIELD SAMPLE

NO.

FINE

SANDGravel COARSE

SAND

AASHTO FRACTIONS

86.1 46.8

18.8

19- 13.9 10.9

2.707

2.627

Western Federal Lands

Project No.: ID BLM IFD 01000(1) Sample ID: W-23-2141-SO

Materials Laboratory

ISO/IEC 17025:2017 Accredited Date Distributed: 01/05/2024

Table of Contents

Station:

Material Description: SO-PS

MilePost:

Offset:

Intended Use:

Remarks:

Source Name: NA

Source Location: NA Sample Location: Other

Submitted By: Leah Wilmot

Quantity Represented: NA

Item No.:

Field Sample No.: G01

Lot No.: NA Date Sampled: 11/2/2023

Depth: 2.0'-3.0' Hole No.: TP23-01

Project Name: CONANT BANK AND STREAM

RESTORATION

W-23-2141-SO _________________________________________________________________ 2

W-23-2141-SO _________________________________________________________________ 6

Station:

Project No.: ID BLM IFD 01000(1) Sample ID: W-23-2141-SO

Materials Laboratory

ISO/IEC 17025:2017 Accredited Date Distributed: 01/05/2024

Material Description: SO-PS

MilePost:

Offset:

Intended Use:

Remarks:

Source Name: NA

Source Location: NA Sample Location: Other

Submitted By: Leah Wilmot

Quantity Represented: NA

Item No.:

Field Sample No.: G01

Lot No.: NA Date Sampled: 11/2/2023

Depth: 2.0'-3.0' Hole No.: TP23-01

Project Name: CONANT BANK AND STREAM

RESTORATION

Unit of MeasureResult

R value by Exudation @ 300 psi 19

Density @ R Value 86.1 pcf

Moisture @ R Value 46.8 %

Methods: T 190 AASHTO Test Date: 12/8/2023 Tested By: Rob Lange

Comments:

Test Validated By: Rob Lange Validated Date: 12/14/2023

Version 1

Unit of MeasureResult

Specific Gravity @ 20°C 2.707

Methods: AASHTO T 100 - Specific Gravity of Soils Test Date: 12/6/2023 Tested By: Rob Lange

Comments:

Test Validated By: Rob Lange Validated Date: 12/7/2023

Version 1

Unit of MeasureResult

Liquid Limit From T 89 39

Plastic Limit from T 90 21

Plasticity Index 18

Methods: AASHTO T 89 & T 90 - Atterberg Limits Test Date: 12/6/2023 Tested By: Rob LangeVersion 2

All reported results apply to the sample as received.

Page 2 of 4Sample ID: W-23-2141-SO

Con tro lle d C op y

Comments:

Test Validated By: Jerrad Isch Validated Date: 12/7/2023

Unit of MeasureResult

6" sieve (152.4 mm) % Passing - %

5" sieve (127 mm) % Passing - %

4" sieve (101.6 mm) % Passing - %

3 1/2" sieve (88.9 mm) % Passing - %

3" sieve sieve (76 mm) % Passing - %

2 1/2" sieve (63.5 mm) % Passing - %

2" sieve (50.0 mm) % Passing 100.0 %

1 1/2" sieve (37.5 mm) % Passing 98.9 %

1" sieve (25.0 mm) % Passing 98.9 %

3/4" sieve (19.0 mm) % Passing 98.9 %

1/2" sieve (12.5 mm) % Passing 98.8 %

3/8" sieve (9.5 mm) % Passing 98.8 %

No. 4 sieve (4.75 mm) % Passing 98.7 %

No. 10 sieve (2.0 mm) % Passing 98.6 %

No. 40 Sieve (0.425 mm) % Passing 98.2 %

No. 200 Sieve (0.075 mm) % Passing 94.3 %

Interpolated 0.020 mm % Passing 82.6 %

Interpolated 0.010 mm % Passing 76.4 %

Interpolated 0.005 mm % Passing 70.3 %

Interpolated 0.002 mm % Passing 53.6 %

Interpolated 0.001 mm % Passing 49.8 %

D10 - mm

D30 0.00051 mm

D50 0.00168 mm

D60 0.00277 mm

CU Unable to calculate

CC -

Methods: AASHTO T 88 - Particle Size Analysis of Soils Test Date: 12/5/2023 Tested By: Rob Lange

Comments:

Test Validated By: Wilson Super User Validated Date: 1/5/2024

Version 3

Unit of MeasureResult

Classification A-6 (17)

Gravel (2.00 mm and larger) 1.4 %

Coarse sand (2.0 to 0.42 mm) 0.4 %

Fine Sand (0.42 to 0.074 mm) 3.9 %

Methods: AASHTO M 145 - Classification (AASHTO M 145 is not an AAP accredited test)

Test Date: 12/11/2023

Tested By: Rob LangeVersion 1

All reported results apply to the sample as received.

Page 3 of 4Sample ID: W-23-2141-SO

Con tro lle d C

Unit of MeasureResult

Silt-clay (0.075mm and smaller) 94.3 %

Comments:

Test Validated By: Rob Lange Validated Date: 12/11/2023

Unit of MeasureResult

Classification CL, Lean Clay

Cobbles 0 %

Coarse Gravel 1 %

Fine Gravel 0 %

Coarse Sand 0 %

Medium Sand 0 %

Fine Sand 4 %

Clay 94 %

Methods: ASTM D2487 - (Unified Soils Classification System) Test Date: 1/5/2024 Tested By: Eric Wilson

Comments:

Test Validated By: Wilson Super User Validated Date: 1/5/2024

Version 1

All reported results apply to the sample as received.

Page 4 of 4Sample ID: W-23-2141-SO

Con tro lle d C

Lab ID:

AASHTO T 190 - R Value

Name Units Value

➖➖➖ Results ➖➖➖

Plotting Method Curved

R Value by exudation @ 300 psi [none] 19

Density at R Value PCF 86.1

Moisture at R Value % 46.8

W-23-2141-SO

Sample ID: W-23-2142-SO

Materials Laboratory

ISO/IEC 17025:2017 Accredited Date Distributed: 11/21/2023

Table of Contents

Station:

Material Description: T 265 - Moisture Content of Soils

MilePost:

Offset:

Intended Use:

Remarks:

Source Name: NA

Source Location: NA Sample Location: Other

Submitted By: Leah Wilmot

Quantity Represented: NA

Item No.:

Field Sample No.: M01

Lot No.: NA Date Sampled: 11/2/2023

Depth: 0.7'-1.6' Hole No.: TP23-01

Project Name: CONANT BANK AND STREAM

RESTORATION

W-23-2142-SO _________________________________________________________________ 2

Project No.: ID BLM IFD 01000(1) Sample ID: W-23-2142-SO

Materials Laboratory

ISO/IEC 17025:2017 Accredited Date Distributed: 11/21/2023

Material Description: T 265 - Moisture Content of Soils

MilePost:

Offset:

Intended Use:

Remarks:

Source Name: NA

Source Location: NA Sample Location: Other

Submitted By: Leah Wilmot

Quantity Represented: NA

Item No.:

Field Sample No.: M01

Lot No.: NA Date Sampled: 11/2/2023

Depth: 0.7'-1.6' Hole No.: TP23-01

Project Name: CONANT BANK AND STREAM

RESTORATION

Unit of MeasureResult

Drying Temperature 230 ° F

Moisture Content 13.9 %

Methods: AASHTO T 265 Moisture Content of Soil Test Date:

Tested By: Rob Lange

Comments:

Test Validated By: Rob Lange Validated Date: 11/21/2023

Version 1

All reported results apply to the sample as received.

Page 2 of 2Sample ID: W-23-2142-SO

Con tro lle d C

Sample ID: W-23-2143-SO

Materials Laboratory

ISO/IEC 17025:2017 Accredited Date Distributed: 12/20/2023

Table of Contents

Station:

Material Description: Soil

MilePost:

Offset:

Intended Use:

Remarks:

Source Name: NA

Source Location: NA Sample Location: Other

Submitted By: Leah Wilmot

Quantity Represented: NA

Item No.:

Field Sample No.: M02

Lot No.: NA Date Sampled: 11/2/2023

Depth: 5.2'-5.4' Hole No.: TP23-01

Project Name: CONANT BANK AND STREAM

RESTORATION

W-23-2143-SO _________________________________________________________________ 2

Project No.: ID BLM IFD 01000(1) Sample ID: W-23-2143-SO

Materials Laboratory

ISO/IEC 17025:2017 Accredited Date Distributed: 12/20/2023

Material Description: Soil

MilePost:

Offset:

Intended Use:

Remarks:

Source Name: NA

Source Location: NA Sample Location: Other

Submitted By: Leah Wilmot

Quantity Represented: NA

Item No.:

Field Sample No.: M02

Lot No.: NA Date Sampled: 11/2/2023

Depth: 5.2'-5.4' Hole No.: TP23-01

Project Name: CONANT BANK AND STREAM

RESTORATION

Unit of MeasureResult

6"sieve (152.4 mm) % Passing - %

5" sieve (127.0 mm) % Passing - %

4" sieve (101.6 mm) % Passing - %

3.5" sieve (88.9 mm) % Passing - %

3" sieve(76.2 mm) % Passing - %

2.5" sieve (63.5 mm) % Passing - %

2" sieve (50.0 mm) % Passing - %

1.5" sieve (37.5 mm) % Passing - %

1" sieve (25.0 mm) % Passing - %

3/4" sieve (19.0 mm) % Passing - %

1/2" sieve (12.5 mm) % Passing - %

3/8" sieve (9.5 mm) % Passing 100 %

No. 4 sieve (4.75 mm) % Passing 100 %

No. 8 sieve (2.36 mm) % Passing - %

No. 10 sieve (2.0mm) % Passing 100 %

No. 16 sieve (1.18 mm) % Passing - %

No. 20 sieve (0.841 mm) % Passing - %

No. 30 sieve (0.600 mm) % Passing - %

No. 40 sieve (0.425 mm) % Passing 100 %

No. 50 sieve (0.300 mm) % Passing - %

No. 60 sieve (0.250 mm) % Passing - %

No. 80 sieve (0.177 mm) % Passing - %

No. 100 sieve (0.150 mm) % Passing 98 %

No. 200 sieve (0.075 mm) % Passing 74.1 %

Methods: AASHTO T 11 & T 27 - Sieve Analysis of Aggregate & Minus No.

200 Wash

Test Date: 11/24/2023

Tested By: Chuck SchneiderVersion 1

All reported results apply to the sample as received.

Page 2 of 4Sample ID: W-23-2143-SO

Con tro lle d C

AASHTO T11 (% finer than No. 200 sieve) N/A

Comments:

Test Validated By: Jerrad Isch Validated Date: 11/27/2023

Unit of MeasureResult

Drying Temperature 140 ° F

Moisture Content 10.9 %

Methods: AASHTO T 265 Moisture Content of Soil Test Date: 11/16/2023 Tested By: Walter Stong

Comments:

Test Validated By: Jerrad Isch Validated Date: 11/27/2023

Version 1

Unit of MeasureResult

Liquid Limit From T 89 Not Run

Plastic Limit from T 90 Non-Plastic

Plasticity Index Not Applicable

Methods: AASHTO T 89 & T 90 - Atterberg Limits Test Date: 12/7/2023 Tested By: Rob Lange

Comments:

Test Validated By: Rob Lange Validated Date: 12/7/2023

Version 1

Unit of MeasureResult

Classification ML, Silt with sand

Cobbles 0 %

Coarse Gravel 0 %

Fine Gravel 0 %

Coarse Sand 0 %

Medium Sand 0 %

Fine Sand 26 %

Methods: ASTM D2487 - (Unified Soils Classification System) Test Date: 12/14/2023 Tested By: Rob Lange

Comments: Unable to calculate D10, D30, D50, D60, Cu, Cc based on gradation results -- 12/14/2023 11:38:46 AM Test Validated By: Rob Lange Validated Date: 12/14/2023

Version 1

Unit of MeasureResult

Classification A-4 (0)

Gravel (2.00-mm and larger) 0.0 %

Methods: M 145 - AASHTO (AASHTO M 145 is not an AAP accredited test) Test Date: 12/7/2023 Tested By: Jerrad IschVersion 1

All reported results apply to the sample as received.

Page 3 of 4Sample ID: W-23-2143-SO

Con tro lle d C

Coarse sand (2.0 to 0.42-mm) 0.0 %

Fine Sand (0.42 to 0.074-mm) 25.9 %

Silt-clay (0.075 and smaller) 74.1 %

Comments:

Test Validated By: Rob Lange Validated Date: 12/14/2023

All reported results apply to the sample as received.

Page 4 of 4Sample ID: W-23-2143-SO

Con tro lle d C

Sample ID: W-23-2144-SO

Materials Laboratory

ISO/IEC 17025:2017 Accredited Date Distributed: 01/05/2024

Table of Contents

Station:

Material Description: SO-COM

MilePost:

Offset:

Intended Use:

Remarks:

Source Name: NA

Source Location: NA Sample Location: Other

Submitted By: Leah Wilmot

Quantity Represented: NA

Item No.:

Field Sample No.: G01

Lot No.: NA Date Sampled: 11/2/2023

Depth: 2.3'-2.7' Hole No.: TP23-02

Project Name: CONANT BANK AND STREAM

RESTORATION

W-23-2144-SO _________________________________________________________________ 2

Project No.: ID BLM IFD 01000(1) Sample ID: W-23-2144-SO

Materials Laboratory

ISO/IEC 17025:2017 Accredited Date Distributed: 01/05/2024

Material Description: SO-COM

MilePost:

Offset:

Intended Use:

Remarks:

Source Name: NA

Source Location: NA Sample Location: Other

Submitted By: Leah Wilmot

Quantity Represented: NA

Item No.:

Field Sample No.: G01

Lot No.: NA Date Sampled: 11/2/2023

Depth: 2.3'-2.7' Hole No.: TP23-02

Project Name: CONANT BANK AND STREAM

RESTORATION

Unit of MeasureResult

Specific Gravity @ 20°C 2.627

Methods: AASHTO T 100 - Specific Gravity of Soils Test Date: 12/6/2023 Tested By: Rob Lange

Comments:

Test Validated By: Rob Lange Validated Date: 12/7/2023

Version 1

Unit of MeasureResult

Liquid Limit From T 89 36

Plastic Limit from T 90 20

Plasticity Index 16

Methods: AASHTO T 89 & T 90 - Atterberg Limits Test Date: 12/11/2023 Tested By: Jerrad Isch

Comments:

Test Validated By: Jerrad Isch Validated Date: 12/12/2023

Version 1

Unit of MeasureResult

Classification A-6 (14)

Gravel (2.00 mm and larger) 0.0 %

Coarse sand (2.0 to 0.42 mm) - %

Fine Sand (0.42 to 0.074 mm) - %

Methods: AASHTO M 145 - Classification (AASHTO M 145 is not an AAP accredited test)

Test Date: 12/12/2023

Tested By: Jerrad IschVersion 1

All reported results apply to the sample as received.

Page 2 of 4Sample ID: W-23-2144-SO

Con tro lle d C

Silt-clay (0.075mm and smaller) 92.1 %

Comments:

Test Validated By: Wilson Super User Validated Date: 12/12/2023

Unit of MeasureResult

6" sieve (152.4 mm) % Passing - %

5" sieve (127 mm) % Passing - %

4" sieve (101.6 mm) % Passing - %

3 1/2" sieve (88.9 mm) % Passing - %

3" sieve sieve (76 mm) % Passing - %

2 1/2" sieve (63.5 mm) % Passing - %

2" sieve (50.0 mm) % Passing - %

1 1/2" sieve (37.5 mm) % Passing - %

1" sieve (25.0 mm) % Passing - %

3/4" sieve (19.0 mm) % Passing - %

1/2" sieve (12.5 mm) % Passing - %

3/8" sieve (9.5 mm) % Passing - %

No. 4 sieve (4.75 mm) % Passing 100.0 %

No. 10 sieve (2.0 mm) % Passing 100.0 %

No. 40 Sieve (0.425 mm) % Passing 99.1 %

No. 200 Sieve (0.075 mm) % Passing 91.2 %

Interpolated 0.020 mm % Passing 76.1 %

Interpolated 0.010 mm % Passing 68.2 %

Interpolated 0.005 mm % Passing 51.5 %

Interpolated 0.002 mm % Passing 37.6 %

Interpolated 0.001 mm % Passing 36.7 %

D10 - mm

D30 0.00099 mm

D50 0.00462 mm

D60 0.00695 mm

CU Unable to calculate

CC -

Methods: AASHTO T 88 - Particle Size Analysis of Soils Test Date: 12/5/2023 Tested By: Rob Lange

Comments:

Test Validated By: Wilson Super User Validated Date: 1/3/2024

Version 2

Unit of MeasureResult

Classification CL, Lean Clay

Cobbles 0 %

Methods: ASTM D2487 - (Unified Soils Classification System) Test Date: 1/5/2024 Tested By: Eric WilsonVersion 1

All reported results apply to the sample as received.

Page 3 of 4Sample ID: W-23-2144-SO

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Coarse Gravel 0 %

Fine Gravel 0 %

Coarse Sand 0 %

Medium Sand 1 %

Fine Sand 8 %

Clay 91 %

Comments:

Test Validated By: Eric Wilson Validated Date: 1/5/2024

All reported results apply to the sample as received.

Page 4 of 4Sample ID: W-23-2144-SO

Con tro lle d C

Sample ID: W-23-2145-SO

Materials Laboratory

ISO/IEC 17025:2017 Accredited Date Distributed: 11/21/2023

Table of Contents

Station:

Material Description: T 265 - Moisture Content of Soils

MilePost:

Offset:

Intended Use:

Remarks:

Source Name: NA

Source Location: NA Sample Location: Other

Submitted By: Leah Wilmot

Quantity Represented: NA

Item No.:

Field Sample No.: M01

Lot No.: NA Date Sampled: 11/2/2023

Depth: 2.8'-3.0' Hole No.: TP23-02

Project Name: CONANT BANK AND STREAM

RESTORATION

W-23-2145-SO _________________________________________________________________ 2

Project No.: ID BLM IFD 01000(1) Sample ID: W-23-2145-SO

Materials Laboratory

ISO/IEC 17025:2017 Accredited Date Distributed: 11/21/2023

Material Description: T 265 - Moisture Content of Soils

MilePost:

Offset:

Intended Use:

Remarks:

Source Name: NA

Source Location: NA Sample Location: Other

Submitted By: Leah Wilmot

Quantity Represented: NA

Item No.:

Field Sample No.: M01

Lot No.: NA Date Sampled: 11/2/2023

Depth: 2.8'-3.0' Hole No.: TP23-02

Project Name: CONANT BANK AND STREAM

RESTORATION

Unit of MeasureResult

Drying Temperature 230 ° F

Moisture Content 18.8 %

Methods: AASHTO T 265 Moisture Content of Soil Test Date: 11/21/2023 Tested By: Rob Lange

Comments:

Test Validated By: Rob Lange Validated Date: 11/21/2023

Version 1

All reported results apply to the sample as received.

Page 2 of 2Sample ID: W-23-2145-SO

Con tro lle d C

Sample ID: W-23-2146-SO

Materials Laboratory

ISO/IEC 17025:2017 Accredited Date Distributed: 01/10/2024

Table of Contents

Station:

Material Description: Soil

MilePost:

Offset:

Intended Use:

Remarks:

Source Name: NA

Source Location: NA Sample Location: Other

Submitted By: Leah Wilmot

Quantity Represented: NA

Item No.:

Field Sample No.: M02

Lot No.: NA Date Sampled: 11/2/2023

Depth: 4.0'-4.2' Hole No.: TP23-02

Project Name: CONANT BANK AND STREAM

RESTORATION

W-23-2146-SO _________________________________________________________________ 2

Project No.: ID BLM IFD 01000(1) Sample ID: W-23-2146-SO

Materials Laboratory

ISO/IEC 17025:2017 Accredited Date Distributed: 01/10/2024

Material Description: Soil

MilePost:

Offset:

Intended Use:

Remarks:

Source Name: NA

Source Location: NA Sample Location: Other

Submitted By: Leah Wilmot

Quantity Represented: NA

Item No.:

Field Sample No.: M02

Lot No.: NA Date Sampled: 11/2/2023

Depth: 4.0'-4.2' Hole No.: TP23-02

Project Name: CONANT BANK AND STREAM

RESTORATION

Unit of MeasureResult

Liquid Limit From T 89 37

Plastic Limit from T 90 21

Plasticity Index 16

Methods: AASHTO T 89 & T 90 - Atterberg Limits Test Date: 12/11/2023 Tested By: Jerrad Isch

Comments:

Test Validated By: Jerrad Isch Validated Date: 12/12/2023

Version 1

Unit of MeasureResult

Drying Temperature 140 ° F

Moisture Content 15.4 %

Methods: AASHTO T 265 Moisture Content of Soil Test Date: 11/29/2023 Tested By: Jerrad Isch

Comments:

Test Validated By: Jerrad Isch Validated Date: 12/12/2023

Version 1

All reported results apply to the sample as received.

Page 2 of 2Sample ID: W-23-2146-SO

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