B08 - W9123826BA010 A09 - Natomas AECOM Draft Brookfield Borrow Investigation Report - 20230921.pdf

Soil and Site Investigation

Brookfield Borrow Site Natomas Basin Project

Project number: 60709700

September 2023

DRAFT

AECOM

2020 L Street, Suite 400 Sacramento, CA 95811 aecom.com

September 21, 2023

Franco De Paola US Army Corps of Engineers 1325 J Street Sacramento, CA 95814

Natomas Basin Project, Sacramento County, California

Dear Mr. De Paola, AECOM Technical Services, Inc. is pleased to present the attached Soil and Site Investigation Technical Memorandum for the Brookfield Borrow Site, in support of the Natomas Basin Project.

This Technical Memorandum is a deliverable under Task Order W91238-22-F-0005 of Contract W91238-21-D-0002.

We appreciate the opportunity to be of service to the US Army Corps of Engineers. Please contact the undersigned if you have any questions.

Sincerely, AECOM Technical Services, Inc.

DRAFT

Shawn Orgill, PE Task Order Manager

DRAFT Project number: 60709700

Prepared for: US Army Corps of Engineers AECOM i

Table of Contents

1. Introduction

2. Site Description

3. Historical Subsurface Exploration and Laboratory Testing Programs

4. Surficial Geology

5. Subsurface Investigation

6. Geotechnical Laboratory Testing

7. Environmental Laboratory Testing

8. Levee Embankment Fill Suitability Evaluation

9. Limitations

10. References

Appendices

Appendix A. Test Pit Logs Appendix B. Geotechnical Laboratory Test Results Appendix C. Import Fill Chemical Screening Limits and Environmental Laboratory Test Results Appendix D. Kleinfelder 2022 Investigation Report

Figures

Figure 1. Vicinty Map Figure 2. Test Pit Location Map

Tables

Table 1. Test Pit Locations Table 2. Supplemental Environmental Surface Sampling Locations Table 3. Geotechnical Laboratory Testing Summary Table 4. Project Fill Criteria

Acronyms and Abbreviations

AECOM AECOM Technical Services, Inc.

bgs below ground surface DWR State of California Department of Water Resources FWLA Fugro William Lettis & Associates NAVD88 North American Vertical Datum of 1988 NEMDC Natomas East Main Drain Canal SAFCA Sacramento Area Flood Control Agency USACE US Army Corps of Engineers

DRAFT Project number: 60709700

Prepared for: US Army Corps of Engineers AECOM

1. Introduction

AECOM Technical Services, Inc. (AECOM) is providing geotechnical engineering support services to the US Army Corps of Engineers (USACE) for the Natomas Basin Project located in Sacramento, California.

The Sacramento Area Flood Control Agency (SAFCA) and USACE identified a source of earthen fill material at the Brookfield site. The site location is shown on Figure 1. AECOM performed a geotechnical subsurface investigation to collect samples from this site and characterize the geotechnical and chemical properties of the materials. This Technical Memorandum provides the results of this investigation. USACE will use the investigation results to evaluate suitability of these materials for use as levee embankment fill for the improvements related to the Natomas Basin Project.

2. Site Description

The Brookfield borrow site is located southwest of the intersection of Howsley Road and the Natomas Road in Sutter County, California. Natomas Road is along the levee crown of the Natomas East Main Drain Canal (NEMDC) West levee (see Figure 1). The site has historically been used for agricultural purposes and is generally flat. The site covers about 145 acres. At the time of AECOM’s investigation, the ground surface was covered with grass and weeds.

3. Historical Subsurface Exploration and Laboratory Testing Programs

Kleinfelder performed a preliminary borrow site investigation in December, 2022 at the Brookfield site. This investigation included 32 hand auger explorations (2B-22-001 to 2B-22-032) for environmental testing. Five of the hand auger explorations (2B-22-002, 2B-22-008, 2B-22-014, 2B-22-024, and 2B-22-028) were also sampled and tested for geotechnical index properties. The locations of the 2022 Kleinfelder hand auger borings are shown on Figure 2. Exploration data from Kleinfelder’s 2022 investigation are provided in Appendix D.

4. Surficial Geology

Fugro William Lettis & Associates (FWLA) developed a surficial geomorphology map and geomorphic assessment for the project site area in 2010 (FWLA, 2010). The assessment was based on review and analyses of existing geological, soil, and topographic maps, interpretation of 1937 aerial photographs, and a limited review of geotechnical data available as of January 2008.

The Brookfield Site is underlain by middle to late Pleistocene deposits from the upper and lower units of the Riverbank and Modesto Formations. The Modesto Formation is inset to the Riverbank Formation and is associated with nested terraces along larger streams in the areas.

The Riverbank Formation is an alluvial fan deposit consisting of weathered gravel, sand, silt, and clay that consist of an upper (younger) and lower (older) member. The lower member is well-consolidated, while the upper member is semi- to weakly-consolidated. Each member is

DRAFT Project number: 60709700

Prepared for: US Army Corps of Engineers AECOM capped by a moderate- to well-developed hardpan layer. The Modesto Formation also comprises upper (younger) and lower (older) units. The lower unit consists of unconsolidated slightly weathered gravel, sand, silt, and clay. The upper unit consists of sand, silt, and some gravel, with a moderate amount of secondary clay accumulation.

Holocene and historical channel deposits are also mapped along the project site inset into the Modesto formation deposits. Surficial geologic mapping of the project site from the FWLA report is shown on Figure 2.

5. Subsurface Investigation

AECOM performed a supplemental subsurface investigation program to collect additional samples for environmental and geotechnical testing in June 2023. This investigation consisted of 15 test pits excavated to depths of about 10 feet below ground surface (bgs). The test pit locations were selected to supplement the existing hand auger data from the Kleinfelder investigation. The horizontal locations of the test pits were recorded using a hand-held GPS device. The location of the test pits are shown on Figure 2 and summarized in Table 1.

Elevations were estimated using LiDAR information from the State of California Department of Water Resources’ (DWR’s) Urban Levee Evaluations Program. Elevations are provided with respect to the North American Vertical Datum of 1988 (NAVD88).

Table 1. Test Pit Locations

Test Pit ID Latitude Longitude Approximate Ground Surface Elevation

(feet, NAVD88)

Termination Depth (feet)

4B-23-01 38.816625 -121.523799 33.10 10

4B-23-02 38.815881 -121.525263 32.59 10

4B-23-03 38.816765 -121.526127 32.59 10

4B-23-04 38.817572 -121.527632 32.33 10

4B-23-05 38.819589 -121.528847 33.09 10

4B-23-06 38.820194 -121.529815 33.07 10

4B-23-07 38.812091 -121.523958 32.02 10

4B-23-08 38.813806 -121.524624 32.35 10

4B-23-09 38.818715 -121.525628 33.13 10

4B-23-10 38.821875 -121.527334 33.41 10

4B-23-11 38.815728 -121.527119 32.10 10

4B-23-12 38.815301 -121.523079 32.98 10

4B-23-13 38.818411 -121.527281 32.75 10

4B-23-14 38.821323 -121.529398 33.14 10

4B-23-15 38.813396 -121.527148 31.79 10

The test pits were excavated by an AECOM operator using a John Deere backhoe. Test Pits were excavated to a depth of about 10 feet below ground surface and samples were taken every 2 feet for geotechnical index testing. Samples were visually classified in the field in

DRAFT Project number: 60709700

Prepared for: US Army Corps of Engineers AECOM accordance with ASTM 2488 and then retained in sealed plastic bags to preserve field moisture content.

In addition, soil samples were collected from seven of the test pits for environmental sampling.

The environmental samples were generally collected from the same depth intervals as the geotechnical samples. For each environmental sample, two jars full of material were collected (one in an 8 ounce and one in a 16 ounce glass jar). The glass jars were completely filled.

Samples for environmental testing were kept on ice in a cooler until they were delivered to the laboratory for testing. Four supplemental near surface samples (4B-23-SS1E to 4B-23-SS4E) were collected for environmental testing near four of the historical Kleinfelder explorations.

These were hand excavated and sampled at a depth of about 1 foot bgs. The locations of the surface sampling are shown in Table 2.

Table 2. Supplemental Environmental Surface Sampling Locations

Sample ID Latitude Longitude Paired Kleinfelder Historical Exploration

4B-23-SS1E 38.81326 -121.52414 2B-22-026

4B-23-SS2E 38.81315 -121.52696 2B-22-025

4B-23-SS3E 38.81243 -121.52813 2B-22-027

4B-23-SS4E 38.81240 -121.52690 2B-22-028

Test pit logs are included in Appendix A. Upon completion, the test pits were backfilled with excavated materials and compacted in lifts using a compaction wheel attachment on the backhoe.

6. Geotechnical Laboratory Testing

Soil samples were delivered to the geotechnical laboratory of Geocon, Inc. of Rancho Cordova, CA for further evaluation and testing. The following laboratory tests were performed:

• Sieve analysis in accordance with ASTM D6913

• Hydrometer analysis in accordance with ASTM D7928

• Atterberg limits in accordance with ASTM D4318, using the wet preparation method

• Specific gravity in accordance with AASHTO T100

• Organic content in accordance with ASTM D2974

• Triaxial shear in accordance with ASTM D4767 on laboratory remolded samples

• Permeability testing in accordance with ASTM D5084 on laboratory remolded samples

• Maximum dry density and optimum moisture content tests in accordance with ASTM D698

• Expansion index in accordance with ASTM D4829

• Cation exchange capacity testing in accordance with ASTM D7503

• Corrosion in accordance with CTM 643, CTM 417, and CTM 422

• Pinhole erosion in accordance with ASTM D4647

• Shrinkage limits in accordance with ASTM D4943

DRAFT Project number: 60709700

Prepared for: US Army Corps of Engineers AECOM

Laboratory test results are provided in Appendix B, and summarized Table 3. The laboratory test results were used to adjust soil classifications on the test pit logs, in accordance with ASTM D2487. Where samples needed to be remolded (e.g., for permeability and triaxial shear testing), the samples were compacted to 95 percent of the maximum dry density per ASTM D698 at a moisture content within ±1 percent of the optimum moisture content.

DRAFT Project number: 60709700

Prepared for: US Army Corps of Engineers AECOM

Table 3. Geotechnical Laboratory Testing Summary

Test Pit ID Sample Depth (feet)

USCS

Classification

Moisture Content

Liquid Limit

Plasticity Index

Fines Content

Organic Content

Specific Gravity

Maximum Dry Density (pcf)

Optimum Moisture

Content (%)

Expansion Index

Cation Exchange Capacity pH Chloride (ppm)

Sulfate (ppm)

Minimum Resistivity (ohm-cm)

Pinhole Dispersion

Classification

Shrinkage Limit (%)

Other Tests

4B-23-01 1 – 5 (Composite)

CL 34.7 32 17 52.4 113.5 13.9 30 ND3 Triaxial Shear; Hydraulic Conductivity

2 CL 17.0 2.8 2.68 27.5 7.59 13.4 28.5 1,150 11.0

4 SM 14.3 46.3

6 SP-SM 14.1 11.0

8 CL 21.0 45 24 52.8

4B-23-02 2 CL 15.4 45 27 70.1 3.7

6 CL 25.7 50 28 82.3

4B-23-03 2 CL 16.7 3.0

4 CL 16.2 37 16 62.4 2.70

8 CH 43.6 66 44 98.2

4B-23-04 2 CL 1.8 30.5 7.37 8.6 13.8 1,130

4 CL 19.2 39 22 79.0

6 CL 23.1

4B-23-05 2 SM 12.8 2.0 2.68

6 CL 15.0 34 15 60.1

6 – 10 (Composite)

CL 19.9 45 26 70.3 103.1 21.8 61 ND3 12.2 Triaxial Shear; Hydraulic Conductivity

10 CL 22.3 80.6

4B-23-06 2 CL 17.8 34 20 1.8

4 CL 14.7 50.6

8 CL 18.1 47 29 63.7

4B-23-07 2 CL 13.7 88.7 2.1

6 CL 24.8 40 16 78.0 2.68

6 – 10 (Composite)

CL 22.4 39 21 94.1 101.7 21.8 71 ND3 Triaxial Shear; Hydraulic Conductivity

10 CL 21.6 90.8

4B-23-08 2 CL 15.9 2.5

4 SC 16.0 37 19 44.2

6 CL 21.4 42 24 95.4

10 ML 25.3 89.9 21.9 7.08 15.6 20.5 1,550 15.5

DRAFT Project number: 60709700

Prepared for: US Army Corps of Engineers AECOM

Test Pit ID Sample Depth (feet)

USCS

Classification

Moisture Content

Liquid Limit

Plasticity Index

Fines Content

Organic Content

Specific Gravity

Maximum Dry Density (pcf)

Optimum Moisture

Content (%)

Expansion Index

Cation Exchange Capacity pH Chloride (ppm)

Sulfate (ppm)

Minimum Resistivity (ohm-cm)

Pinhole Dispersion

Classification

Shrinkage Limit (%)

Other Tests

4B-23-09 2 CL 13.6 32 13 68.2 1.6

4 ML 20.2 81.3

10 CL 24.5 48 30 89.6

4B-23-10 2 CL 18.1 1.9

4 CL 19.1 42 24 69.7

6 CL 19.1 82.3

8 ML 23.4 86.9

10 ML 24.7 44 17 95.4

4B-23-11 1 – 5 (Composite)

CH 18.6 55 39 71.8 106.9 17.8 84 ND3 Triaxial Shear; Hydraulic Conductivity

2 CL 19.3 44 28 3.7

4 CL 18.2 66.9

8 CL 22.4 85.2 36.9 7.82 6.6 5.5 1,450 10.1

10 CL 22.8 44 24 87.3

4B-23-12 2 CL 16.6 43 22 77.3 3.2

4 CL 17.0 72.5

10 ML 30.1 35 6 89.1

4B-23-13 2 CL 19.2 39 18 77.0 3.0

6 CL 21.4 79.7

8 CL 21.6 42 26 81.8

4B-23-14 1 – 5 (composite)

CL 18.2 44 27 75.3 105.4 18.4 77 ND3 Triaxial Shear; Hydraulic Conductivity

2 CL 17.7 45 29 81.1 3.5

6 CL 22.9 2.71

10 CL 20.8 38 14 87.6

4B-23-15 2 CH 16.6 68 53 67.2 2.7 33.6 7.69 14.7 55.5 990 10.0

6 SC 12.2 48 24 15.0

8 ML 28.0 45 18 93.7

DRAFT Project number: 60709700

Prepared for: US Army Corps of Engineers AECOM

7. Environmental Laboratory Testing

Environmental testing was performed by California Laboratory Services of Rancho Cordova, California. Analytical testing include metals, total petroleum hydrocarbons, polynuclear aromatic hydrocarbons, polychlorinated biphenyls, organochlorine pesticides, chlorinated herbicides, and selected volatile organic compounds. Specific chemicals are listed in the Imported Fill Chemical Screening Limits list provided in Appendix C. Analytical test results are also provided in Appendix C.

8. Levee Embankment Fill Suitability Evaluation

The soils encountered consisted primarily of fine grained soils (silts, lean clays, and fat clays with varying amounts of sand). In addition, limited areas of silty sand, clayey sand, and poorly graded sand with silt were also encountered. Cemented soils were common.

It is AECOM’s understanding that the material from this site is being considered for use as Type 1, Type 2 or Type 3 fill for the Reach F and G levee construction project. Criteria for Type 1, Type 2 and Type 3 fill based on the project specifications are summarized in Table 4.

Table 4. Project Fill Criteria

Fill Material Type

Maximum Particle Size

Percent Fines

Liquid Limit Plasticity Index

Type 1 2 inches > 10 Running 10-test Average < 55

No single test >60

Running 10-test Average PI>10.

Type 2 2 inches > 30 Running 10-test Average < 40

No single test >45

Running 10-test Average 10<PI<30.

No single test <8.

Type 3 2 inches > 30 Running 10-test Average < 55

No single test >60

Running 10-test Average 10<PI<40.

No single test <8.

The site is generally not suitable for use as Type 2 fill based on the field and laboratory test results. The materials predominantly meet, or could be blended to meet, the criteria for use as Type 1 and Type 3 fill. However, two of the tested samples had liquid limits exceeding 55 and sandy soils with fines content below 30 percent were encountered in two of the test pits. Due to the variable nature of the subsurface conditions at the site and the preponderance of cemented and medium to high plasticity materials, thorough processing, blending and moisture conditioning efforts will be required to produce a homogenous material suitable for use as embankment fill. In addition, a surficial cover layer of topsoil with visible concentrations of organics was observed that is not considered suitable for use as fill.

9. Limitations

This Technical Memorandum was prepared in accordance with the standard of care commonly used as the state-of-practice in the engineering profession. Standard of care is defined as the ordinary diligence exercised by fellow practitioners in this area performing the same services under similar circumstances during the same period. No warranty, express or implied, is made.

DRAFT Project number: 60709700

Prepared for: US Army Corps of Engineers

Discussions of subsurface conditions summarized in this report are based on subsurface soil conditions encountered at limited exploration locations. Variations in subsurface conditions may exist between exploration locations. Due to the inherent variability of subsurface soil conditions, AECOM makes no warranty, express or implied, that actual encountered site and subsurface soil conditions will exactly conform to the conditions encountered within.

Data presented in this report are time-sensitive in that they apply only to locations and conditions existing at the time of the exploration or collection of the data. Data should not be applied to any other projects in or near the area of this study nor should they be applied at a future time without appropriate verification. This Technical Memorandum is for the use and benefit of USACE. Use by any other party is at their own discretion and risk.

10. References

DWR, 2010. Modified Supplemental Geotechnical Data Report (MSGDR), Natomas East Main Drainage Canal (NEMDC) West Study Area. November.

Fugro William Lettis & Associates (FWLA). 2010. Surficial Geologic Map and Geomorphic Assessment. Natomas East Main Drainage Canal Study Area, Sacramento and Sutter Counties, California. June.

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NATOMAS BASIN PROJECT,

SACRAMENTO COUNTY, CA

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NATOMAS BASIN PROJECT,

SACRAMENTO COUNTY, CA

Exploration Location Map

DRAFT Project number: 60709700

Prepared for: US Army Corps of Engineers AECOM

Appendix A Test Pit Logs

CP PA

HD PA

PA

HD PA

SANDY LEAN CLAY (CL); very dark grayish brown (10YR 3/2); moist; 55% low plasticity, medium dry strength, no dilatancy fines; 45% fine sand; vegetation and rootlets observed.

LEAN CLAY (CL); black (10YR 2/1); moist; 100% medium plasticity, high dry strength, no dilatancy fines;

trace fine sand.

LEAN CLAY with Sand (CL); brown (7.5YR 4/3); moist;

85% low plasticity, low dry strength, no dilatancy fines;

15% fine sand.

SILTY SAND (SM); olive brown (2.5Y 4/3); moist; 55% fine to medium sand; 45% no plasticity fines; indurated, hard blocky materials; cemented.

Poorly Graded SAND with Silt (SP-SM); olive brown (2.5Y 4/3); moist; 90% fine to coarse sand; 10% no plasticity fines.

At 6.5 feet: color changes to reddish yellow (7.5YR 6/6);

mosture increases to wet.

SANDY LEAN CLAY (CL); strong brown (7.5YR 4/6);

wet; 55% medium plasticity, high dry strength, no dilatancy fines; 45% fine sand; laminated with iron oxidation and black lenses.

S1

S2

S3

S4

S5

Total Depth 10'

Composite bulk sample from 1 to 5 feet

Geotechnical sample only.

Geotechnical sample only.

Geotechnical sample only.

Geotechnical sample only.

Geotechnical sample only.

DRILL RIG MAKE AND MODEL

John Deere 410L Backhoe

DATE STARTED

6/7/23

VERTICAL INCLINED

DATE COMPLETED

6/7/23

DRILLER'S NAME

Luis Ramirez

DRILL BIT SIZE AND TYPE (HOLE DIAMETER)

N/A

HAMMER EFFICIENCY

DRILLING ROD TYPE AND DIAMETER

N/A

GROUNDWATER READING:

ELEVATION DATUM

NAVD 88

DRILLING METHOD

Test Pit

X

CASING TYPE, DIAMETER, INSTALLATION DEPTH

N/A

GROUND ELEVATION

33.10 ft

TOTAL DEPTH OF BORING

10.0 ft

CONSULTANT COMPANY

AECOM

FIELD LOGGER

E. Kruk

SAMPLER TYPE(S)

Grab, Bulk

HAMMER TYPE, MAKE/MODEL, WEIGHT/DROP

N/A

AFTER DRILLING (DATE-TIME)

DRILLING CONTRACTOR

AECOM

FIELD LOG REVIEWER

S. Orgill

HELPER'S NAME

N/A

BOREHOLE BACKFILL OR COMPLETION

Backfilled with native soil compacted using a compaction wheel.

DURING DRILLING

Not Encountered

TOTAL DEPTH OF FILL

0 ft

O th er L ab T es ts

LABORATORY DATA

Sheet 1 of 1

CLASSIFICATION OF MATERIALS

(Description)

P la st ic ity In de x

R ec ov er y, S am pl e

N um be r

W at er C on te nt

Li qu id Li m it

F in es

E le va tio n, f ee t

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T M

S am pl e

Lo ca tio n

D ep th , f ee t

American River Common Features, Natomas Basin

M at er ia l G ra ph ic s

P P o r

T V ts f

REMARKS

LOG OF TEST PIT

4B-23-01

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County: SacramentoBorehole Location: Field

Channel / River Name / Feature: Brookfield Borrow Site

State Plane CA Zone 2Coord. System:

Levee Station or Milepost: N/A Levee Reach N/A Survey Method: GPS

Latitude: 38.816625 Longitude: -121.523799

Coordinates: Northing: 2059575.64 Easting: 6697344.03

Levee Mile: N/A

SANDY LEAN CLAY (CL); black (10YR 2/1); moist;

70% medium plasticity, high dry strength, no dilatancy fines; 30% fine sand.

LEAN CLAY with Sand (CL); dark yellowish brown (10YR 3/4); moist; 80% medium plasticity, high dry strength, no dilatancy fines; 20% fine sand.

At 7.5 feet: as above except cemented and indurated materials were encountered along with an increase in moisture content.

At 9.5 feet: as above except the color changes to light olive brown [2.5Y 5/3]; 100% fines; trace fine sand.

S1

S2

S3

S4

S5

Total Depth 10'

Both geotechnical and environmental samples collected.

Both geotechnical and environmental samples collected.

Both geotechnical and environmental samples collected.

Both geotechnical and environmental samples collected.

Both geotechnical and environmental samples collected.

DRILL RIG MAKE AND MODEL

John Deere 410L Backhoe

DATE STARTED

6/7/23

VERTICAL INCLINED

DATE COMPLETED

6/7/23

DRILLER'S NAME

Luis Ramirez

DRILL BIT SIZE AND TYPE (HOLE DIAMETER)

N/A

HAMMER EFFICIENCY

DRILLING ROD TYPE AND DIAMETER

N/A

GROUNDWATER READING:

ELEVATION DATUM

NAVD 88

DRILLING METHOD

Test Pit

X

CASING TYPE, DIAMETER, INSTALLATION DEPTH

N/A

GROUND ELEVATION

32.59 ft

TOTAL DEPTH OF BORING

10.0 ft

CONSULTANT COMPANY

AECOM

FIELD LOGGER

E. Kruk

SAMPLER TYPE(S)

Grab, Bulk

HAMMER TYPE, MAKE/MODEL, WEIGHT/DROP

N/A

AFTER DRILLING (DATE-TIME)

DRILLING CONTRACTOR

AECOM

FIELD LOG REVIEWER

S. Orgill

HELPER'S NAME

N/A

BOREHOLE BACKFILL OR COMPLETION

Backfilled with native soil compacted using a compaction wheel.

DURING DRILLING

Not Encountered

TOTAL DEPTH OF FILL

0 ft

O th er L ab T es ts

LABORATORY DATA

Sheet 1 of 1

CLASSIFICATION OF MATERIALS

(Description)

P la st ic ity In de x

R ec ov er y, S am pl e

N um be r

W at er C on te nt

Li qu id Li m it

F in es

E le va tio n, f ee t

N f B lo w s pe r F t

N

(A S

T M

S am pl e

Lo ca tio n

D ep th , f ee t

American River Common Features, Natomas Basin

M at er ia l G ra ph ic s

P P o r

T V ts f

REMARKS

LOG OF TEST PIT

4B-23-02

LO

G

O F

T E

S T

P

IT

B

R O

O K

F

IE

LD

B

O R

R O

W S

IT

E

.G

T O

M A

S R

E A

C H

H -0

6.

G

LB

/2 1/

County: SacramentoBorehole Location: Field

Channel / River Name / Feature: Brookfield Borrow Site

State Plane CA Zone 2Coord. System:

Levee Station or Milepost: N/A Levee Reach N/A Survey Method: GPS

Latitude: 38.815881 Longitude: -121.525263

Coordinates: Northing: 2059302.22 Easting: 6696928.43

Levee Mile: N/A

PA

LEAN CLAY (CL); very dark gray (7.5YR 3/1); moist;

100% medium plasticity, high dry strength, no dilatancy fines; trace roots and vegetation.

SANDY LEAN CLAY (CL); light yellowish brown (2.5Y 6/3); moist; 60% medium plasticity, high dry strength, no dilatancy fines; 40% fine to medium sand; interbedded with a less than 1 inch thick lense of coarse, angular sand.

FAT CLAY (CH); light yellowish brown (2.5Y 6/3); moist;

100% medium plasticity, high dry strength, no dilatancy fines; trace fine sand.

At 7.5 feet: as above except heavily indurated nodules and oxidation on face of blocky clay encountered;

harder digging.

S1

S2

S3

S4

S5

Total Depth 10'

Geotechnical sample only.

Geotechnical sample only.

Geotechnical sample only.

Composite bulk sample collected from 6-10 feet.

Geotechnical sample only.

Difficult excavation encountered.

Geotechnical sample only.

DRILL RIG MAKE AND MODEL

John Deere 410L Backhoe

DATE STARTED

6/6/23

VERTICAL INCLINED

DATE COMPLETED

6/6/23

DRILLER'S NAME

Luis Ramirez

DRILL BIT SIZE AND TYPE (HOLE DIAMETER)

N/A

HAMMER EFFICIENCY

DRILLING ROD TYPE AND DIAMETER

N/A

GROUNDWATER READING:

ELEVATION DATUM

NAVD 88

DRILLING METHOD

Test Pit

X

CASING TYPE, DIAMETER, INSTALLATION DEPTH

N/A

GROUND ELEVATION

32.59 ft

TOTAL DEPTH OF BORING

10.0 ft

CONSULTANT COMPANY

AECOM

FIELD LOGGER

E. Kruk

SAMPLER TYPE(S)

Grab, Bulk

HAMMER TYPE, MAKE/MODEL, WEIGHT/DROP

N/A

AFTER DRILLING (DATE-TIME)

DRILLING CONTRACTOR

AECOM

FIELD LOG REVIEWER

S. Orgill

HELPER'S NAME

N/A

BOREHOLE BACKFILL OR COMPLETION

Backfilled with native soil compacted using a compaction wheel.

DURING DRILLING

Not Encountered

TOTAL DEPTH OF FILL

0 ft

O th er L ab T es ts

LABORATORY DATA

Sheet 1 of 1

CLASSIFICATION OF MATERIALS

(Description)

P la st ic ity In de x

R ec ov er y, S am pl e

N um be r

W at er C on te nt

Li qu id Li m it

F in es

E le va tio n, f ee t

N f B lo w s pe r F t

N

(A S

T M

S am pl e

Lo ca tio n

D ep th , f ee t

American River Common Features, Natomas Basin

M at er ia l G ra ph ic s

P P o r

T V ts f

REMARKS

LOG OF TEST PIT

4B-23-03

LO

G

O F

T E

S T

P

IT

B

R O

O K

F

IE

LD

B

O R

R O

W S

IT

E

.G

T O

M A

S R

E A

C H

H -0

6.

G

LB

/2 1/

County: SacramentoBorehole Location: Field

Channel / River Name / Feature: Brookfield Borrow Site

State Plane CA Zone 2Coord. System:

Levee Station or Milepost: N/A Levee Reach N/A Survey Method: GPS

Latitude: 38.816765 Longitude: -121.526127

Coordinates: Northing: 2059623.03 Easting: 6696680.53

Levee Mile: N/A

FAT CLAY (CH); black (10YR 2/1); moist; 100% high plasticity, high dry strength, no dilatancy fines.

LEAN CLAY with Sand (CL); dark yellowish brown (10YR 3/4); moist; 80% medium to high plasticity, high dry strength, no dilatancy fines; 20% fine sand.

At 6.5 feet: as above except interbedded with lenses of

SILT (ML).

At 8.5 feet: SILT (ML) lenses no longer present.

22100

S1

S2

S3

39 79

Total Depth 10'

Both geotechnical and environmental samples collected.

Both geotechnical and environmental samples collected.

Both geotechnical and environmental samples collected.

DRILL RIG MAKE AND MODEL

John Deere 410L Backhoe

DATE STARTED

6/6/23

VERTICAL INCLINED

DATE COMPLETED

6/6/23

DRILLER'S NAME

Luis Ramirez

DRILL BIT SIZE AND TYPE (HOLE DIAMETER)

N/A

HAMMER EFFICIENCY

DRILLING ROD TYPE AND DIAMETER

N/A

GROUNDWATER READING:

ELEVATION DATUM

NAVD 88

DRILLING METHOD

Test Pit

X

CASING TYPE, DIAMETER, INSTALLATION DEPTH

N/A

GROUND ELEVATION

32.33 ft

TOTAL DEPTH OF BORING

10.0 ft

CONSULTANT COMPANY

AECOM

FIELD LOGGER

E. Kruk

SAMPLER TYPE(S)

Grab, Bulk

HAMMER TYPE, MAKE/MODEL, WEIGHT/DROP

N/A

AFTER DRILLING (DATE-TIME)

DRILLING CONTRACTOR

AECOM

FIELD LOG REVIEWER

S. Orgill

HELPER'S NAME

N/A

BOREHOLE BACKFILL OR COMPLETION

Backfilled with native soil compacted using a compaction wheel.

DURING DRILLING

Not Encountered

TOTAL DEPTH OF FILL

0 ft

O th er L ab T es ts

LABORATORY DATA

Sheet 1 of 1

CLASSIFICATION OF MATERIALS

(Description)

P la st ic ity In de x

R ec ov er y, S am pl e

N um be r

W at er C on te nt

Li qu id Li m it

F in es

E le va tio n, f ee t

N f B lo w s pe r F t

N

(A S

T M

S am pl e

Lo ca tio n

D ep th , f ee t

American River Common Features, Natomas Basin

M at er ia l G ra ph ic s

P P o r

T V ts f

REMARKS

LOG OF TEST PIT

4B-23-04

LO

G

O F

T E

S T

P

IT

B

R O

O K

F

IE

LD

B

O R

R O

W S

IT

E

.G

T O

M A

S R

E A

C H

H -0

6.

G

LB

/2 1/

County: SacramentoBorehole Location: Field

Channel / River Name / Feature: Brookfield Borrow Site

State Plane CA Zone 2Coord. System:

Levee Station or Milepost: N/A Levee Reach N/A Survey Method: GPS

Latitude: 38.817572 Longitude: -121.527632

Coordinates: Northing: 2059914.68 Easting: 6696250.36

Levee Mile: N/A

HD PA

FAT CLAY (CH); black (5YR 2.5/1); moist; 100% high plasticity, high dry strength, no dilatancy fines.

SILTY SAND (SM); brown (10YR 5/3); moist; 70% fine to coarse sand; 30% no plasticity fines; stratified with clay and silt lenses; indurated.

SANDY LEAN CLAY (CL); dark yellowish brown (10YR 4/6); moist; 60% medium plasticity, medium dry strength, no dilatancy fines; 40% fine to medium sand;

weak cementation.

At 6.5 feet: as above except yellowish brown (10YR 4/6); 70% fines; 30% sand.

At 8 feet: locally cemented with rust discoloration.

LEAN CLAY with Sand (CL); yellowish red (5YR 5/6);

moist; 80% medium plasticity, high dry strength, no dilatancy fines; 20% fine sand.

S1

S2

S3

S4

S5

Total Depth 10'

Geotechnical sample only.

Geotechnical sample only.

Geotechnical sample only.

Composite bulk sample collected from 6 to 10 feet.

Geotechnical sample only.

Geotechnical sample only.

DRILL RIG MAKE AND MODEL

John Deere 410L Backhoe

DATE STARTED

6/5/23

VERTICAL INCLINED

DATE COMPLETED

6/5/23

DRILLER'S NAME

Luis Ramirez

DRILL BIT SIZE AND TYPE (HOLE DIAMETER)

N/A

HAMMER EFFICIENCY

DRILLING ROD TYPE AND DIAMETER

N/A

GROUNDWATER READING:

ELEVATION DATUM

NAVD 88

DRILLING METHOD

Test Pit

X

CASING TYPE, DIAMETER, INSTALLATION DEPTH

N/A

GROUND ELEVATION

33.09 ft

TOTAL DEPTH OF BORING

10.0 ft

CONSULTANT COMPANY

AECOM

FIELD LOGGER

E. Kruk

SAMPLER TYPE(S)

Grab, Bulk

HAMMER TYPE, MAKE/MODEL, WEIGHT/DROP

N/A

AFTER DRILLING (DATE-TIME)

DRILLING CONTRACTOR

AECOM

FIELD LOG REVIEWER

S. Orgill

HELPER'S NAME

N/A

BOREHOLE BACKFILL OR COMPLETION

Backfilled with native soil compacted using a compaction wheel.

DURING DRILLING

Not Encountered

TOTAL DEPTH OF FILL

0 ft

O th er L ab T es ts

LABORATORY DATA

Sheet 1 of 1

CLASSIFICATION OF MATERIALS

(Description)

P la st ic ity In de x

R ec ov er y, S am pl e

N um be r

W at er C on te nt

Li qu id Li m it

F in es

E le va tio n, f ee t

N f B lo w s pe r F t

N

(A S

T M

S am pl e

Lo ca tio n

D ep th , f ee t

American River Common Features, Natomas Basin

M at er ia l G ra ph ic s

P P o r

T V ts f

REMARKS

LOG OF TEST PIT

4B-23-05

LO

G

O F

T E

S T

P

IT

B

R O

O K

F

IE

LD

B

O R

R O

W S

IT

E

.G

T O

M A

S R

E A

C H

H -0

6.

G

LB

/2 1/

County: SacramentoBorehole Location: Field

Channel / River Name / Feature: Brookfield Borrow Site

State Plane CA Zone 2Coord. System:

Levee Station or Milepost: N/A Levee Reach N/A Survey Method: GPS

Latitude: 38.819589 Longitude: -121.528847

Coordinates: Northing: 2060647.44 Easting: 6695900.38

Levee Mile: N/A

FAT CLAY (CH); black (5YR 2.5/1); moist; 100% high plasticity, high dry strength, no dilatancy fines.

SANDY LEAN CLAY (CL); brown (10YR 5/3); moist;

55% medium plasticity, high dry strength, no dilatancy fines; 45% fine sand.

LEAN CLAY (CL); brown (10YR 5/3); moist; 100% low plasticity, medium dry strength, slow dilatancy fines;

trace sand; increasing cementation.

SANDY LEAN CLAY (CL); brown (10YR 5/3); moist;

65% low plasticity, low dry strength, slow dilatancy fines;

35% fine to medium sand.

LEAN CLAY (CL); brown (10YR 4/3); moist; 100% low plasticity, medium dry strength, slow dilatancy fines;

fines are blocky; weakly cemented.

S1

S2

S3

S4

S5

Total Depth 10'

Both geotechnical and environmental samples collected.

Both geotechnical and environmental samples collected.

Both geotechnical and environmental samples collected.

Both geotechnical and environmental samples collected.

Both geotechnical and environmental samples collected.

DRILL RIG MAKE AND MODEL

John Deere 410L Backhoe

DATE STARTED

6/5/23

VERTICAL INCLINED

DATE COMPLETED

6/5/23

DRILLER'S NAME

Luis Ramirez

DRILL BIT SIZE AND TYPE (HOLE DIAMETER)

N/A

HAMMER EFFICIENCY

DRILLING ROD TYPE AND DIAMETER

N/A

GROUNDWATER READING:

ELEVATION DATUM

NAVD 88

DRILLING METHOD

Test Pit

X

CASING TYPE, DIAMETER, INSTALLATION DEPTH

N/A

GROUND ELEVATION

33.07 ft

TOTAL DEPTH OF BORING

10.0 ft

CONSULTANT COMPANY

AECOM

FIELD LOGGER

E. Kruk

SAMPLER TYPE(S)

Grab, Bulk

HAMMER TYPE, MAKE/MODEL, WEIGHT/DROP

N/A

AFTER DRILLING (DATE-TIME)

DRILLING CONTRACTOR

AECOM

FIELD LOG REVIEWER

S. Orgill

HELPER'S NAME

N/A

BOREHOLE BACKFILL OR COMPLETION

Backfilled with native soil compacted using a compaction wheel.

DURING DRILLING

Not Encountered

TOTAL DEPTH OF FILL

0 ft

O th er L ab T es ts

LABORATORY DATA

Sheet 1 of 1

CLASSIFICATION OF MATERIALS

(Description)

P la st ic ity In de x

R ec ov er y, S am pl e

N um be r

W at er C on te nt

Li qu id Li m it

F in es

E le va tio n, f ee t

N f B lo w s pe r F t

N

(A S

T M

S am pl e

Lo ca tio n

D ep th , f ee t

American River Common Features, Natomas Basin

M at er ia l G ra ph ic s

P P o r

T V ts f

REMARKS

LOG OF TEST PIT

4B-23-06

LO

G

O F

T E

S T

P

IT

B

R O

O K

F

IE

LD

B

O R

R O

W S

IT

E

.G

T O

M A

S R

E A

C H

H -0

6.

G

LB

/2 1/

County: SacramentoBorehole Location: Field

Channel / River Name / Feature: Brookfield Borrow Site

State Plane CA Zone 2Coord. System:

Levee Station or Milepost: N/A Levee Reach N/A Survey Method: GPS

Latitude: 38.820194 Longitude: -121.529815

Coordinates: Northing: 2060866.17 Easting: 6695623.32

Levee Mile: N/A

CP PA

PA

LEAN CLAY (CL); black (10YR 2/1); moist; 90% medium plasticity, high dry strength, no dilatancy fines;

10% fine to medium sand.

At 2 feet: color changes to dark yellowish brown;

increasing medium sand content with depth.

LEAN CLAY with Sand (CL); olive brown (2.5Y 4/4);

moist; 80% medium plasticity, high dry strength, no dilatancy fines; 20% fine to coarse sand.

LEAN CLAY with Sand (CL); olive yellow (2.5Y 6/6);

moist; 75% medium plasticity, high dry strength, no dilatancy fines; 25% fine to coarse sand.

At 6.5 feet: decreasing sand content; becoming indurated.

LEAN CLAY (CL); light olive brown (2.5Y 5/3); moist;

90% low plasticity, low to medium dry strength, no dilatancy fines; 10% fine sand; rounded, inudrated clay nodules present to 0.5" diameter.

S1

S2

S3

S4

Total Depth 10'

Geotechnical sample only.

Geotechnical sample only.

Composite bulk sample collected from 6 to 10 feet.

Geotechnical sample only.

Geotechnical sample only.

DRILL RIG MAKE AND MODEL

John Deere 410L Backhoe

DATE STARTED

6/8/23

VERTICAL INCLINED

DATE COMPLETED

6/8/23

DRILLER'S NAME

Luis Ramirez

DRILL BIT SIZE AND TYPE (HOLE DIAMETER)

N/A

HAMMER EFFICIENCY

DRILLING ROD TYPE AND DIAMETER

N/A

GROUNDWATER READING:

ELEVATION DATUM

NAVD 88

DRILLING METHOD

Test Pit

X

CASING TYPE, DIAMETER, INSTALLATION DEPTH

N/A

GROUND ELEVATION

32.02 ft

TOTAL DEPTH OF BORING

10.0 ft

CONSULTANT COMPANY

AECOM

FIELD LOGGER

E. Kruk

SAMPLER TYPE(S)

Grab, Bulk

HAMMER TYPE, MAKE/MODEL, WEIGHT/DROP

N/A

AFTER DRILLING (DATE-TIME)

DRILLING CONTRACTOR

AECOM

FIELD LOG REVIEWER

S. Orgill

HELPER'S NAME

N/A

BOREHOLE BACKFILL OR COMPLETION

Backfilled with native soil compacted using a compaction wheel.

DURING DRILLING

Not Encountered

TOTAL DEPTH OF FILL

0 ft

O th er L ab T es ts

LABORATORY DATA

Sheet 1 of 1

CLASSIFICATION OF MATERIALS

(Description)

P la st ic ity In de x

R ec ov er y, S am pl e

N um be r

W at er C on te nt

Li qu id Li m it

F in es

E le va tio n, f ee t

N f B lo w s pe r F t

N

(A S

T M

S am pl e

Lo ca tio n

D ep th , f ee t

American River Common Features, Natomas Basin

M at er ia l G ra ph ic s

P P o r

T V ts f

REMARKS

LOG OF TEST PIT

4B-23-07

LO

G

O F

T E

S T

P

IT

B

R O

O K

F

IE

LD

B

O R

R O

W S

IT

E

.G

T O

M A

S R

E A

C H

H -0

6.

G

LB

/2 1/

County: SacramentoBorehole Location: Field

Channel / River Name / Feature: Brookfield Borrow Site

State Plane CA Zone 2Coord. System:

Levee Station or Milepost: N/A Levee Reach N/A Survey Method: GPS

Latitude: 38.812091 Longitude: -121.523958

Coordinates: Northing: 2057924.19 Easting: 6697307.57

Levee Mile: N/A

LEAN CLAY (CL); dark brown (7.5YR 3/3); moist; 100% medium plasticity, medium dry strength, no dilatancy fines.

CLAYEY SAND (SC); dark yellowish brown (10YR 4/4);

moist; 55% fine sand; 45% low plasticity, medium dry strength, no dilatancy fines.

LEAN CLAY (CL); yellowish brown (10YR 5/6); moist;

95% low plasticity, medium dry strength, no dilatancy fines; 5% fine to coarse sand.

SILT (ML); grayish brown (10YR 5/2); moist; 90% low plasticity, low dry strength, slow dilatancy fines; 10% fine sand.

S1

S2

S3

S4

S5

Total Depth 10'

Geotechnical sample only.

Both geotechnical and environmental samples collected.

Both geotechnical and environmental samples collected.

Both geotechnical and environmental samples collected.

Both geotechnical and environmental samples collected.

DRILL RIG MAKE AND MODEL

John Deere 410L Backhoe

DATE STARTED

6/8/23

VERTICAL INCLINED

DATE COMPLETED

6/8/23

DRILLER'S NAME

Luis Ramirez

DRILL BIT SIZE AND TYPE (HOLE DIAMETER)

N/A

HAMMER EFFICIENCY

DRILLING ROD TYPE AND DIAMETER

N/A

GROUNDWATER READING:

ELEVATION DATUM

NAVD 88

DRILLING METHOD

Test Pit

X

CASING TYPE, DIAMETER, INSTALLATION DEPTH

N/A

GROUND ELEVATION

32.35 ft

TOTAL DEPTH OF BORING

10.0 ft

CONSULTANT COMPANY

AECOM

FIELD LOGGER

E. Kruk

SAMPLER TYPE(S)

Grab, Bulk

HAMMER TYPE, MAKE/MODEL, WEIGHT/DROP

N/A

AFTER DRILLING (DATE-TIME)

DRILLING CONTRACTOR

AECOM

FIELD LOG REVIEWER

S. Orgill

HELPER'S NAME

N/A

BOREHOLE BACKFILL OR COMPLETION

Backfilled with native soil compacted using a compaction wheel.

DURING DRILLING

Not Encountered

TOTAL DEPTH OF FILL

0 ft

O th er L ab T es ts

LABORATORY DATA

Sheet 1 of 1

CLASSIFICATION OF MATERIALS

(Description)

P la st ic ity In de x

R ec ov er y, S am pl e

N um be r

W at er C on te nt

Li qu id Li m it

F in es

E le va tio n, f ee t

N f B lo w s pe r F t

N

(A S

T M

S am pl e

Lo ca tio n

D ep th , f ee t

American River Common Features, Natomas Basin

M at er ia l G ra ph ic s

P P o r

T V ts f

REMARKS

LOG OF TEST PIT

4B-23-08

LO

G

O F

T E

S T

P

IT

B

R O

O K

F

IE

LD

B

O R

R O

W S

IT

E

.G

T O

M A

S R

E A

C H

H -0

6.

G

LB

/2 1/

County: SacramentoBorehole Location: Field

Channel / River Name / Feature: Brookfield Borrow Site

State Plane CA Zone 2Coord. System:

Levee Station or Milepost: N/A Levee Reach N/A Survey Method: GPS

Latitude: 38.813806 Longitude: -121.524624

Coordinates: Northing: 2058547.59 Easting: 6697114.36

Levee Mile: N/A

SANDY LEAN CLAY (CL); brown (7.5YR 5/2); moist;

70% medium plasticity, high dry strength, no dilatancy fines; 30% fine sand; rootlets.

At 2 feet: as above except brown (10YR 6/4).

SILT with Sand (ML); light yellowish brown (10YR 6/4);

moist; 80% low plasticity, low dry strength, slow dilatancy fines; 20% fine sand; slightly indurated.

LEAN CLAY (CL); dark yellowish brown (10YR 3/4);

moist; 90% medium plasticity, high dry strength, no dilatancy fines; 10% fine sand; strongly indurated.

S1

S2

S3

S4

S5

Total Depth 10'

Geotechnical sample only.

Both geotechnical and environmental samples collected.

Both geotechnical and environmental samples collected.

Both geotechnical and environmental samples collected.

Both geotechnical and environmental samples collected.

DRILL RIG MAKE AND MODEL

John Deere 410L Backhoe

DATE STARTED

6/6/23

VERTICAL INCLINED

DATE COMPLETED

6/6/23

DRILLER'S NAME

Luis Ramirez

DRILL BIT SIZE AND TYPE (HOLE DIAMETER)

N/A

HAMMER EFFICIENCY

DRILLING ROD TYPE AND DIAMETER

N/A

GROUNDWATER READING:

ELEVATION DATUM

NAVD 88

DRILLING METHOD

Test Pit

X

CASING TYPE, DIAMETER, INSTALLATION DEPTH

N/A

GROUND ELEVATION

33.13 ft

TOTAL DEPTH OF BORING

10.0 ft

CONSULTANT COMPANY

AECOM

FIELD LOGGER

E. Kruk

SAMPLER TYPE(S)

Grab, Bulk

HAMMER TYPE, MAKE/MODEL, WEIGHT/DROP

N/A

AFTER DRILLING (DATE-TIME)

DRILLING CONTRACTOR

AECOM

FIELD LOG REVIEWER

S. Orgill

HELPER'S NAME

N/A

BOREHOLE BACKFILL OR COMPLETION

Backfilled with native soil compacted using a compaction wheel.

DURING DRILLING

Not Encountered

TOTAL DEPTH OF FILL

0 ft

O th er L ab T es ts

LABORATORY DATA

Sheet 1 of 1

CLASSIFICATION OF MATERIALS

(Description)

P la st ic ity In de x

R ec ov er y, S am pl e

N um be r

W at er C on te nt

Li qu id Li m it

F in es

E le va tio n, f ee t

N f B lo w s pe r F t

N

(A S

T M

S am pl e

Lo ca tio n

D ep th , f ee t

American River Common Features, Natomas Basin

M at er ia l G ra ph ic s

P P o r

T V ts f

REMARKS

LOG OF TEST PIT

4B-23-09

LO

G

O F

T E

S T

P

IT

B

R O

O K

F

IE

LD

B

O R

R O

W S

IT

E

.G

T O

M A

S R

E A

C H

H -0

6.

G

LB

/2 1/

County: SacramentoBorehole Location: Field

Channel / River Name / Feature: Brookfield Borrow Site

State Plane CA Zone 2Coord. System:

Levee Station or Milepost: N/A Levee Reach N/A Survey Method: GPS

Latitude: 38.818715 Longitude: -121.525628

Coordinates: Northing: 2060333.92 Easting: 6696819.06

Levee Mile: N/A

HD

LEAN CLAY (CL); dark brown (7.5YR 3/2); moist; 100% medium plasticity, medium dry strength, no dilatancy fines; organics present.

At 0.5 feet: as above excepth black (7.5YR 2.5/1);

decrease in organics.

SANDY LEAN CLAY (CL); very dark gray (5YR 3/1);

moist; 70% medium plasticity, medium dry strength, no dilatancy fines; 30% fine to coarse sand.

LEAN CLAY with Sand (CL); very dark gray (5YR 3/1);

moist; 80% medium plasticity, medium dry strength, no dilatancy fines; 20% fine to coarse sand; increasing sand content with depth.

SILT (ML); light yellowish brown (2.5Y 6/3); moist; 90% low plasticity, low dry strength, slow dilatancy fines; 10% fine to coarse sand; weak cementation.

At 9.5 feet: brownish yellow (10YR 6/8); 95% fines; 5% sand.

S1

S2

S3

S4

S5

Total Depth 10'

Geotechnical sample only.

Both geotechnical and environmental samples collected.

Both geotechnical and environmental samples collected.

Both geotechnical and environmental samples collected.

Both geotechnical and environmental samples collected.

DRILL RIG MAKE AND MODEL

John Deere 410L Backhoe

DATE STARTED

6/5/23

VERTICAL INCLINED

DATE COMPLETED

6/5/23

DRILLER'S NAME

Luis Ramirez

DRILL BIT SIZE AND TYPE (HOLE DIAMETER)

N/A

HAMMER EFFICIENCY

DRILLING ROD TYPE AND DIAMETER

N/A

GROUNDWATER READING:

ELEVATION DATUM

NAVD 88

DRILLING METHOD

Test Pit

X

CASING TYPE, DIAMETER, INSTALLATION DEPTH

N/A

GROUND ELEVATION

33.41 ft

TOTAL DEPTH OF BORING

10.0 ft

CONSULTANT COMPANY

AECOM

FIELD LOGGER

E. Kruk

SAMPLER TYPE(S)

Grab, Bulk

HAMMER TYPE, MAKE/MODEL, WEIGHT/DROP

N/A

AFTER DRILLING (DATE-TIME)

DRILLING CONTRACTOR

AECOM

FIELD LOG REVIEWER

S. Orgill

HELPER'S NAME

N/A

BOREHOLE BACKFILL OR COMPLETION

Backfilled with native soil compacted using a compaction wheel.

DURING DRILLING

Not Encountered

TOTAL DEPTH OF FILL

0 ft

O th er L ab T es ts

LABORATORY DATA

Sheet 1 of 1

CLASSIFICATION OF MATERIALS

(Description)

P la st ic ity In de x

R ec ov er y, S am pl e

N um be r

W at er C on te nt

Li qu id Li m it

F in es

E le va tio n, f ee t

N f B lo w s pe r F t

N

(A S

T M

S am pl e

Lo ca tio n

D ep th , f ee t

American River Common Features, Natomas Basin

M at er ia l G ra ph ic s

P P o r

T V ts f

REMARKS

LOG OF TEST PIT

4B-23-10

LO

G

O F

T E

S T

P

IT

B

R O

O K

F

IE

LD

B

O R

R O

W S

IT

E

.G

T O

M A

S R

E A

C H

H -0

6.

G

LB

/2 1/

County: SacramentoBorehole Location: Field

Channel / River Name / Feature: Brookfield Borrow Site

State Plane CA Zone 2Coord. System:

Levee Station or Milepost: N/A Levee Reach N/A Survey Method: GPS

Latitude: 38.821875 Longitude: -121.527334

Coordinates: Northing: 2061482.27 Easting: 6696326.91

Levee Mile: N/A

LEAN CLAY (CL); black (10YR 2/1); moist; 100% medium plasticity, high dry strength, no dilatancy fines.

SANDY LEAN to FAT CLAY (CL/CH); dark yellowish brown (10YR 4/6); moist; 70% medium plasticity, high dry strength, no dilatancy fines; 30% fine sand.

At 3 feet: becomes indudated and blocky.

LEAN CLAY with Sand (CL); dark yellowish brown (10YR 4/6); moist; 85% medium plasticity, high dry strength, no dilatancy fines; 15% fine sand; indurated and blocky.

At 6 feet: induration reduces.

At 8 feet: blocky with moisture on open faces.

S1

S2

S3

S4

S5

Total Depth 10'

Geotechnical sample only.

Composite bulk sample collected from 1 to 5 feet.

Geotechnical sample only.

Geotechnical sample only.

Geotechnical sample only.

DRILL RIG MAKE AND MODEL

John Deere 410L Backhoe

DATE STARTED

6/7/23

VERTICAL INCLINED

DATE COMPLETED

6/7/23

DRILLER'S NAME

Luis Ramirez

DRILL BIT SIZE AND TYPE (HOLE DIAMETER)

N/A

HAMMER EFFICIENCY

DRILLING ROD TYPE AND DIAMETER

N/A

GROUNDWATER READING:

ELEVATION DATUM

NAVD 88

DRILLING METHOD

Test Pit

X

CASING TYPE, DIAMETER, INSTALLATION DEPTH

N/A

GROUND ELEVATION

32.10 ft

TOTAL DEPTH OF BORING

10.0 ft

CONSULTANT COMPANY

AECOM

FIELD LOGGER

E. Kruk

SAMPLER TYPE(S)

Grab, Bulk

HAMMER TYPE, MAKE/MODEL, WEIGHT/DROP

N/A

AFTER DRILLING (DATE-TIME)

DRILLING CONTRACTOR

AECOM

FIELD LOG REVIEWER

S. Orgill

HELPER'S NAME

N/A

BOREHOLE BACKFILL OR COMPLETION

Backfilled with native soil compacted using a compaction wheel.

DURING DRILLING

Not Encountered

TOTAL DEPTH OF FILL

0 ft

O th er L ab T es ts

LABORATORY DATA

Sheet 1 of 1

CLASSIFICATION OF MATERIALS

(Description)

P la st ic ity In de x

R ec ov er y, S am pl e

N um be r

W at er C on te nt

Li qu id Li m it

F in es

E le va tio n, f ee t

N f B lo w s pe r F t

N

(A S

T M

S am pl e

Lo ca tio n

D ep th , f ee t

American River Common Features, Natomas Basin

M at er ia l G ra ph ic s

P P o r

T V ts f

REMARKS

LOG OF TEST PIT

4B-23-11

LO

G

O F

T E

S T

P

IT

B

R O

O K

F

IE

LD

B

O R

R O

W S

IT

E

.G

T O

M A

S R

E A

C H

H -0

6.

G

LB

/2 1/

County: SacramentoBorehole Location: Field

Channel / River Name / Feature: Brookfield Borrow Site

State Plane CA Zone 2Coord. System:

Levee Station or Milepost: N/A Levee Reach N/A Survey Method: GPS

Latitude: 38.815728 Longitude: -121.527119

Coordinates: Northing: 2059243.89 Easting: 6696399.82

Levee Mile: N/A

LEAN CLAY (CL); black (10YR 2/1); moist; 100% medium plasticity, high dry strength, no dilatancy fines.

LEAN CLAY with Sand (CL); dark yellowish brown (10YR 4/6); moist; 80% medium plasticity, high dry strength, no dilatancy fines; 20% fine sand.

At 3 feet: becomes indurated and blocky; color changes to yellowish brown (10YR 5/6).

At 4 feet: 75% fines; 25% sand.

At 6 feet: reduced induration.

SILT (ML); yellowish brown (10YR 5/6); moist; 90% low to medium plasticity, medium dry strength, no dilatancy fines; 10% fine sand; blocky with free moisture observed on the open faces.

S1

S2

S3

S4

S5

Total Depth 10'

Geotechnical sample only.

Geotechnical sample only.

Composite bulk sample collected from 6 to 10 feet.

Geotechnical sample only.

Geotechnical sample only.

DRILL RIG MAKE AND MODEL

John Deere 410L Backhoe

DATE STARTED

6/7/23

VERTICAL INCLINED

DATE COMPLETED

6/7/23

DRILLER'S NAME

Luis Ramirez

DRILL BIT SIZE AND TYPE (HOLE DIAMETER)

N/A

HAMMER EFFICIENCY

DRILLING ROD TYPE AND DIAMETER

N/A

GROUNDWATER READING:

ELEVATION DATUM

NAVD 88

DRILLING METHOD

Test Pit

X

CASING TYPE, DIAMETER, INSTALLATION DEPTH

N/A

GROUND ELEVATION

32.98 ft

TOTAL DEPTH OF BORING

10.0 ft

CONSULTANT COMPANY

AECOM

FIELD LOGGER

E. Kruk

SAMPLER TYPE(S)

Grab, Bulk

HAMMER TYPE, MAKE/MODEL, WEIGHT/DROP

N/A

AFTER DRILLING (DATE-TIME)

DRILLING CONTRACTOR

AECOM

FIELD LOG REVIEWER

S. Orgill

HELPER'S NAME

N/A

BOREHOLE BACKFILL OR COMPLETION

Backfilled with native soil compacted using a compaction wheel.

DURING DRILLING

Not Encountered

TOTAL DEPTH OF FILL

0 ft

O th er L ab T es ts

LABORATORY DATA

Sheet 1 of 1

CLASSIFICATION OF MATERIALS

(Description)

P la st ic ity In de x

R ec ov er y, S am pl e

N um be r

W at er C on te nt

Li qu id Li m it

F in es

E le va tio n, f ee t

N f B lo w s pe r F t

N

(A S

T M

S am pl e

Lo ca tio n

D ep th , f ee t

American River Common Features, Natomas Basin

M at er ia l G ra ph ic s

P P o r

T V ts f

REMARKS

LOG OF TEST PIT

4B-23-12

LO

G

O F

T E

S T

P

IT

B

R O

O K

F

IE

LD

B

O R

R O

W S

IT

E

.G

T O

M A

S R

E A

C H

H -0

6.

G

LB

/2 1/

County: SacramentoBorehole Location: Field

Channel / River Name / Feature: Brookfield Borrow Site

State Plane CA Zone 2Coord. System:

Levee Station or Milepost: N/A Levee Reach N/A Survey Method: GPS

Latitude: 38.815301 Longitude: -121.523079

Coordinates: Northing: 2059094.42 Easting: 6697551.82

Levee Mile: N/A

LEAN CLAY (CL); black (7.5YR 2.5/1); moist; 100% medium plasticity, high dry strength, no dilatancy fines.

LEAN CLAY with Sand (CL); yellowish brown (10YR 5/4); moist; 80% medium plasticity, high dry strength, no dilatancy fines; 20% fine sand.

At 4 feet: as above, except brown (10YR 5/3).

At 7 feet: interbedded lenses of fine sand layers 2 to 4 inches thick.

S1

S2

S3

S4

S5

Total Depth 10'

Composite bulk sample from 1 to 5 feet

Geotechnical sample only.

Geotechnical sample only.

Geotechnical sample only.

Geotechnical sample only.

Geotechnical sample only.

DRILL RIG MAKE AND MODEL

John Deere 410L Backhoe

DATE STARTED

6/6/23

VERTICAL INCLINED

DATE COMPLETED

6/6/23

DRILLER'S NAME

Luis Ramirez

DRILL BIT SIZE AND TYPE (HOLE DIAMETER)

N/A

HAMMER EFFICIENCY

DRILLING ROD TYPE AND DIAMETER

N/A

GROUNDWATER READING:

ELEVATION DATUM

NAVD 88

DRILLING METHOD

Test Pit

X

CASING TYPE, DIAMETER, INSTALLATION DEPTH

N/A

GROUND ELEVATION

32.75 ft

TOTAL DEPTH OF BORING

10.0 ft

CONSULTANT COMPANY

AECOM

FIELD LOGGER

E. Kruk

SAMPLER TYPE(S)

Grab, Bulk

HAMMER TYPE, MAKE/MODEL, WEIGHT/DROP

N/A

AFTER DRILLING (DATE-TIME)

DRILLING CONTRACTOR

AECOM

FIELD LOG REVIEWER

S. Orgill

HELPER'S NAME

N/A

BOREHOLE BACKFILL OR COMPLETION

Backfilled with native soil compacted using a compaction wheel.

DURING DRILLING

Not Encountered

TOTAL DEPTH OF FILL

0 ft

O th er L ab T es ts

LABORATORY DATA

Sheet 1 of 1

CLASSIFICATION OF MATERIALS

(Description)

P la st ic ity In de x

R ec ov er y, S am pl e

N um be r

W at er C on te nt

Li qu id Li m it

F in es

E le va tio n, f ee t

N f B lo w s pe r F t

N

(A S

T M

S am pl e

Lo ca tio n

D ep th , f ee t

American River Common Features, Natomas Basin

M at er ia l G ra ph ic s

P P o r

T V ts f

REMARKS

LOG OF TEST PIT

4B-23-13

LO

G

O F

T E

S T

P

IT

B

R O

O K

F

IE

LD

B

O R

R O

W S

IT

E

.G

T O

M A

S R

E A

C H

H -0

6.

G

LB

/2 1/

County: SacramentoBorehole Location: Field

Channel / River Name / Feature: Brookfield Borrow Site

State Plane CA Zone 2Coord. System:

Levee Station or Milepost: N/A Levee Reach N/A Survey Method: GPS

Latitude: 38.818411…