Boring Report.pdf

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MEMORANDUM

Missouri Department of Transportation

Construction & Materials Geotechnical Section

TO: Allen Wankum

CC: Scott Emmerich

FROM: Ricardo Todd Senior Geotechnical Specialist

Zachary Troesser, P.E.

Geotechnical Engineer

DATE: October 17, 2025

SUBJECT: Foundation Investigation for Salt Mixing Building Job No. Fi3110 Fayette Maintenance Facility, Howard County

A foundation investigation has been conducted for a new salt mixing building in Howard County for the Fayette Maintenance Facility, as requested by Allen Wankum on January 29, 2025. Attached are logs of boring for the subject project, an aerial photo showing boring locations and subsurface diagram. Coordinate and elevation data were provided by Central District Survey.

Existing Conditions

The topography in the immediate area of the planned structure is relatively flat and gently drains to the north. A fabric salt dome is located west of the proposed structure. The area between the salt dome and the proposed structure is currently being used for storage of snow plowing equipment. Some of this equipment encroaches on the footprint of the proposed structure, however, it is expected to be removed prior to construction.

Four borings were completed at this site and encountered deleterious fill materials consisting of gravel, and fragments of asphalt pavement to depths ranging from approximately 0.4 to 1.0 feet.

Beneath the surficial fill a low plasticity clay was encountered, underlain by very stiff glacial till composed of lean clay and scattered gravel. The glacial till extended to the depth of termination in each boring.

At the time of our investigation, groundwater was not encountered in any boring, however groundwater levels are subjected to fluctuation in depth due to precipitation and seasonal weather conditions.

Recommendations

The following recommendations are based upon information provided regarding the proposed building and conditions observed during the foundation investigation. We understand the proposed facility has a standardized design that has a foundation system designed based on a maximum bearing capacity of 2000 pound per square (psf). A net allowable maximum bearing capacity of 2000 psf may be used for the proposed structure at this location following recommendations below.

Fi3110 Fayette Salt Structure October 17, 2025

In addition, the estimated settlement is expected to be about one inch or less following these recommendations.

All overlying deleterious material such as asphalt and contaminated crushed aggregate base must be scraped and removed from the building site and should not be used as structural fill for the proposed building, however, it is understood that the existing soils will remain in place.

After making any grading excavation and before any fill placement, proof roll all cut and fill areas with a fully loaded tandem axle dump truck. Any rutting or pumping soils should be over excavated and replaced with controlled fill.

It is recommended that any new fill material be lean clay or better. However, use of granular fill material is preferred if feasible. Fill should be compacted to 95% of standard proctor maximum dry density (ASTM D 698). Non-granular fill material should be compacted at a moisture content ranging from two percentage points below optimum moisture content to four percentage points above optimum moisture content as determined by ASTM D 698.

Shallow foundations shall be embedded a minimum of 36 inches below finished grade for frost protection. Individual spread footing shall have a minimum width of 2.5 feet, while strip footing shall have a minimum width of 1.5 feet.

Soils encountered at this site were observed to be moderate to high plastic. These soils are capable of swelling and heaving floor slabs and lightly loaded structures.

Accordingly, we recommend placing a minimum of 12 inches of granular fill beneath the floor slab.

Site grading should be designed to maintain positive drainage away from the building.

We recommend a minimum surface grade of 5 percent away from the building on gravel or landscape areas in the first 10 feet outside the building. We recommend a minimum surface grade of 2 percent away from the building on all paved surfaces in the first 20 feet away from the building. We also recommend directing surface drainage away from the existing salt dome to minimize the potential risk of groundwater contamination.

RNT/zt/kb Attachments

PP = 1.25 tsf

PP = 1.25 tsf

PP = 1.00 tsf

PP = 2.00 tsf

PP = 2.25 tsf

PP = 3.00 tsf

PP = 3.00 tsf

PP = 3.25 tsf

0.0-0.2' ASPHALT

0.2-1.0' CONSTRUCTION DEBRIS

1.0-7.7' Brownish gray mottled black, LEAN CLAY, stiff, moist

7.7-12.6' Grayish brown mottled black, LEAN CLAY trace gravel, stiff, moist

12.6-21.5' Tannish gray, LEAN CLAY scattered gravel, very stiff, moist, (Till)

Bottom of borehole at 21.5 feet.

3-3-4 (11)

2-2-4 (9)

1-2-5 (11)

3-3-5 (12)

2-3-5 (12)

6-5-7 (18)

3-4-7 (17)

5-5-9 (21)

MC = 27.5%

sat = 123 pcf(1)

LL = 43

PL = 22

MC = 28.8%

sat = 121 pcf(1)

MC = 21.1%

sat = 129 pcf(1)

LL = 38

PL = 16

MC = 23.6%

sat = 126 pcf(1)

MC = 21.9%

sat = 128 pcf(1)

LL = 44

PL = 18

MC = 19.5%

sat = 131 pcf(1)

MC = 19.1%

sat = 132 pcf(1)

LL = 42

PL = 16

MC = 19.7%

sat = 131 pcf(1)

G ra ph ic

D ep th (f t)

BORING NO. 1001

F ie ld T es ts

Description

E le va tio n (f t)

S am pl e

T yp e

R E

C

(R Q

D

B lo w C ou nt s (N

S he ar D at a

In de x T es ts

N60 = (Em/60)Nm N60 - Corrected N value for standard 60% SPT efficiency; Em - Measured hammer efficiency in percent; Nm - Observed N-value; (1) = Assumed, (2) = Actual

Missouri Department of Transportation Construction and Materials

Job No.: Fi3110

Operator: Robert WadlowBent:

Easting: 1594240

Location Note:

Equipment: Acker Renegade ,Split-Spoon Sampler

Date of Work: 08/18/25-08/18/25

Logged By: Ricardo Todd

Location: Fayette Maintenance Facility

Route: 240County: Howard

Skew:

Station:

Offset:

Requested Station:

Requested Offset:

Requested Northing:

Requested Easting:

Depth Hole Open:

Northing: 1197053.7

Time Change:

Design:

Depth to Water:

Elevation: 702.1

Requested Elevation:

Drilling Method: Hollow Stem AugerHammer Efficiency: 92%Drill No.: G-9667

Coordinate Zone: Missouri Central Coordinate Proj. Factor: 1.0000914Coordinate System: U.S. State Plane 1983

Coordinate Datum: NAD 83 (CONUS)

* Persons using this information are cautioned that the materials shown are determined by the equipment noted and accuracy of the "log of materials" is limited thereby and by judgement of the operator. THIS INFORMATION IS FOR DESIGN PURPOSES ONLY.

Coordinate Units: U.S. Survey Feet

LE

T

T E

R B

O R

E H

O

LE

M

O D

O T

_2

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D T

0/

/2

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\P R

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C T

F

IL

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\F I3

_H O

W A

R D

C O

_F A

Y E

T T

E S

A

LT

S T

R U

C T

U R

E .G

P J

PP = 1.00 tsf Torvane = 0.55 tsf

PP = 1.50 tsf

PP = 1.75 tsf Torvane = 0.60 tsf

PP = 2.25 tsf

PP = 3.50 tsf

PP = 3.50 tsf

PP = 3.00 tsf

0.0-0.3' ASPHALT

0.3-1.0' CONSTRUCTION DEBRIS

1.0-12.6' Brownish gray mottled black, LEAN CLAY, stiff to very stiff, moist

12.6-21.5' Tannish gray, LEAN CLAY scattered gravel, very stiff, moist, (Till)

Bottom of borehole at 21.5 feet.

1-3-3 (9)

2-4-5 (14)

4-5-5 (15)

3-5-8 (20)

3-5-8 (20)

Qu Test Results UCS = 2.89 ksf

MC = 28.3%

moist = 121.6 pcf

Qu Test Results UCS = 3.96 ksf

MC = 20%

moist = 127.8 pcf

Qu Test Results UCS = 3.11 ksf

MC = 20.5%

moist = 128 pcf

MC = 28.8%

sat = 121 pcf(1)

LL = 40

PL = 21

MC = 28.0%

sat = 122 pcf(1)

LL = 37

PL = 22

MC = 19.5%

sat = 131 pcf(1)

LL = 39

PL = 16

MC = 20.6%

sat = 130 pcf(1)

MC = 19.2%

sat = 131 pcf(1)

LL = 43

PL = 16

MC = 18.7%

sat = 132 pcf(1)

LL = 42

PL = 16

MC = 31.4%

sat = 119 pcf(1)

MC = 17.5%

sat = 133 pcf(1)

G ra ph ic

D ep th (f t)

BORING NO. 1002

F ie ld T es ts

Description

E le va tio n (f t)

S am pl e

T yp e

R E

C

(R Q

D

B lo w C ou nt s (N

S he ar D at a

In de x T es ts

N60 = (Em/60)Nm N60 - Corrected N value for standard 60% SPT efficiency; Em - Measured hammer efficiency in percent; Nm - Observed N-value; (1) = Assumed, (2) = Actual

Missouri Department of Transportation Construction and Materials

Job No.: Fi3110

Operator: Robert WadlowBent:

Easting: 1594239.6

Location Note:

Equipment: Acker Renegade ,Split-Spoon Sampler, Shelby Tube

Date of Work: 08/18/25-08/18/25

Logged By: Ricardo Todd

Location: Fayette Maintenance Facility

Route: 240County: Howard

Skew:

Station:

Offset:

Requested Station:

Requested Offset:

Requested Northing:

Requested Easting:

Depth Hole Open:

Northing: 1197103.7

Time Change:

Design:

Depth to Water:

Elevation: 702.2

Requested Elevation:

Drilling Method: Hollow Stem AugerHammer Efficiency: 92%Drill No.: G-9667

Coordinate Zone: Missouri Central Coordinate Proj. Factor: 1.0000914Coordinate System: U.S. State Plane 1983

Coordinate Datum: NAD 83 (CONUS)

* Persons using this information are cautioned that the materials shown are determined by the equipment noted and accuracy of the "log of materials" is limited thereby and by judgement of the operator. THIS INFORMATION IS FOR DESIGN PURPOSES ONLY.

Coordinate Units: U.S. Survey Feet

LE

T

T E

R B

O R

E H

O

LE

M

O D

O T

_2

.G

D T

0/

/2

9:

Z :\S

G \G

IN

T

\P R

O

JE

C T

F

IL

E S

\F I3

_H O

W A

R D

C O

_F A

Y E

T T

E S

A

LT

S T

R U

C T

U R

E .G

PP = 1.00 tsf

PP = 1.50 tsf

PP = 2.00 tsf

PP = 2.25 tsf

PP = 3.00 tsf

PP = 4.00 tsf

PP = 3.75 tsf

PP = 4.50 tsf

0.0-0.3' ASPHALT

0.3-1.0' CONSTRUCTION DEBRIS

1.0-5.1' Brownish gray mottled black, LEAN CLAY, stiff, moist

5.1-10.1' Tannish gray mottled black, LEAN CLAY, stiff, moist

10.1-21.5' Tannish gray, LEAN CLAY scattered gravel, very stiff, moist, (Till)

Bottom of borehole at 21.5 feet.

2-2-3 (8)

2-2-3 (8)

3-4-5 (14)

2-4-6 (15)

3-4-6 (15)

4-6-8 (21)

4-7-9 (25)

4-7-8 (23)

MC = 30.3%

sat = 120 pcf(1)

LL = 40

PL = 21

MC = 26.7%

sat = 123 pcf(1)

LL = 37

PL = 22

MC = 19.5%

sat = 131 pcf(1)

MC = 20.4%

sat = 130 pcf(1)

LL = 40

PL = 16

MC = 23.6%

sat = 126 pcf(1)

MC = 18.2%

sat = 133 pcf(1)

LL = 43

PL = 16

MC = 18.4%

sat = 132 pcf(1)

G ra ph ic

D ep th (f t)

BORING NO. 1003

F ie ld T es ts

Description

E le va tio n (f t)

S am pl e

T yp e

R E

C

(R Q

D

B lo w C ou nt s (N

S he ar D at a

In de x T es ts

N60 = (Em/60)Nm N60 - Corrected N value for standard 60% SPT efficiency; Em - Measured hammer efficiency in percent; Nm - Observed N-value; (1) = Assumed, (2) = Actual

Missouri Department of Transportation Construction and Materials

Job No.: Fi3110

Operator: Robert WadlowBent:

Easting: 1594263.6

Location Note:

Equipment: Acker Renegade ,Split-Spoon Sampler

Date of Work: 08/18/25-08/18/25

Logged By: Ricardo Todd

Location: Fayette Maintenance Facility

Route: 240County: Howard

Skew:

Station:

Offset:

Requested Station:

Requested Offset:

Requested Northing:

Requested Easting:

Depth Hole Open:

Northing: 1197103.9

Time Change:

Design:

Depth to Water:

Elevation: 701.8

Requested Elevation:

Drilling Method: Hollow Stem AugerHammer Efficiency: 92%Drill No.: G-9667

Coordinate Zone: Missouri Central Coordinate Proj. Factor: 1.0000914Coordinate System: U.S. State Plane 1983

Coordinate Datum: NAD 83 (CONUS)

* Persons using this information are cautioned that the materials shown are determined by the equipment noted and accuracy of the "log of materials" is limited thereby and by judgement of the operator. THIS INFORMATION IS FOR DESIGN PURPOSES ONLY.

Coordinate Units: U.S. Survey Feet

LE

T

T E

R B

O R

E H

O

LE

M

O D

O T

_2

.G

D T

0/

/2

9:

Z :\S

G \G

IN

T

\P R

O

JE

C T

F

IL

E S

\F I3

_H O

W A

R D

C O

_F A

Y E

T T

E S

A

LT

S T

R U

C T

U R

E .G

PP = 2.00 tsf Torvane = 0.50 tsf

PP = 1.00 tsf

PP = 1.50 tsf Torvane = 0.55 tsf

PP = 2.00 tsf

PP = 3.00 tsf Torvane = 0.60 tsf

PP = 3.00 tsf

PP = 2.75 tsf

0.0-0.2' ASPHALT

0.2-1.1' CONSTRUCTION DEBRIS

1.1-7.6' Brownish gray mottled black, LEAN CLAY, stiff, moist

7.6-12.6' Tannish gray, LEAN CLAY, stiff, moist

12.6-21.5' Tannish gray mottled black, LEAN CLAY scattered gravel, very stiff, moist, (Till)

Bottom of borehole at 21.5 feet.

2-2-3 (8)

3-4-6 (15)

4-5-7 (18)

3-4-8 (18)

6-8-11 (29)

Qu Test Results UCS = 2.25 ksf

MC = 27.5%

moist = 121.4 pcf

Qu Test Results UCS = 2.96 ksf

MC = 19.6%

moist = 129.7 pcf

Qu Test Results UCS = 5.91 ksf

MC = 20%

moist = 130.8 pcf

MC = 28.9%

sat = 121 pcf(1)

LL = 37

PL = 24

MC = 19.9%

sat = 131 pcf(1)

LL = 40

PL = 22

MC = 20.2%

sat = 130 pcf(1)

LL = 36

PL = 16

MC = 19.9%

sat = 130 pcf(1)

LL = 39

PL = 16

MC = 19.4%

sat = 131 pcf(1)

LL = 40

PL = 16

MC = 20.6%

sat = 130 pcf(1)

G ra ph ic

D ep th (f t)

BORING NO. 1004

F ie ld T es ts

Description

E le va tio n (f t)

S am pl e

T yp e

R E

C

(R Q

D

B lo w C ou nt s (N

S he ar D at a

In de x T es ts

N60 = (Em/60)Nm N60 - Corrected N value for standard 60% SPT efficiency; Em - Measured hammer efficiency in percent; Nm - Observed N-value; (1) = Assumed, (2) = Actual

Missouri Department of Transportation Construction and Materials

Job No.: Fi3110

Operator: Robert WadlowBent:

Easting: 1594264.1

Location Note:

Equipment: Acker Renegade ,Split-Spoon Sampler, Shelby Tube

Date of Work: 08/18/25-08/18/25

Logged By: Ricardo Todd

Location: Fayette Maintenance Facility

Route: 240County: Howard

Skew:

Station:

Offset:

Requested Station:

Requested Offset:

Requested Northing:

Requested Easting:

Depth Hole Open:

Northing: 1197053.9

Time Change:

Design:

Depth to Water:

Elevation: 702.0

Requested Elevation:

Drilling Method: Hollow Stem AugerHammer Efficiency: 92%Drill No.: G-9667

Coordinate Zone: Missouri Central Coordinate Proj. Factor: 1.0000914Coordinate System: U.S. State Plane 1983

Coordinate Datum: NAD 83 (CONUS)

* Persons using this information are cautioned that the materials shown are determined by the equipment noted and accuracy of the "log of materials" is limited thereby and by judgement of the operator. THIS INFORMATION IS FOR DESIGN PURPOSES ONLY.

Coordinate Units: U.S. Survey Feet

LE

T

T E

R B

O R

E H

O

LE

M

O D

O T

_2

.G

D T

0/

/2

9:

Z :\S

G \G

IN

T

\P R

O

JE

C T

F

IL

E S

\F I3

_H O

W A

R D

C O

_F A

Y E

T T

E S

A

LT

S T

R U

C T

U R

E .G

CLIENT

PROJECT NUMBER Fi3110

PROJECT NAME Fayette Salt Structure

PROJECT LOCATION Fayette Maintenance Facility

ABBREVIATIONS

TV

PID

UC

ppm

TORVANE

PHOTOIONIZATION DETECTOR

UNCONFINED COMPRESSION

PARTS PER MILLION

Split-Spoon Sampler

Shelby Tube

SAMPLER SYMBOLSLITHOLOGIC SYMBOLS

(Unified Soil Classification System)

WELL CONSTRUCTION SYMBOLS

KEY TO SYMBOLS

Water Level at Time of Drilling

Water Level at End of Drilling

Water Level after Drilling

LL

PI

W

DD

NP

-200

PP

Qu

LIQUID LIMIT (%)

PLASTIC INDEX (%)

MOISTURE CONTENT (%)

DRY DENSITY (PCF)

NON PLASTIC

PERCENT PASSING NO. 200 SIEVE

POCKET PENETROMETER (TSF)

UNCONFINED COMPRESSIVE STRENGTH (PSF)

Asphalt

USCS Low Plasticity Clay

USCS Poorly-graded Gravel

Glacial Till

K E

Y T

O S

Y M

B O

LS

M O

D O

T

8.

G

D T

/2

/2

8:

Z :\S

G \G

IN

T

\P R

O

JE

C T

F

IL

E S

\F I3

0_

H O

W A

R D

C O

_F A

Y E

T T

E S

A

LT

S T

R U

C T

U R

E .G

P

Modot

0 5 10 15 20 25 30 35 40 45 50 55

0 5 10 15 20 25 30 35 40 45 50 55

PROJECT LOCATION Fayette Maintenance Facility

CLIENT

Asphalt USCS Poorly-graded Gravel USCS Low Plasticity Clay

Glacial Till E le va tio n ft)

Distance Along Baseline (ft)

PROJECT NAME Fayette Salt Structure

PROJECT NUMBER Fi3110

SUBSURFACE DIAGRAM

M

O D

O T

D Y

N A

M

IC

F E

N C

E

J

P

-A

.G P

J

/2

/2

:5

Z

S G

\G

IN

T \P

R O

JE

C

T F

IL

E

S \F

I3

H

O W

A R

D C

O

F A

Y E

T T

E S

A L

T S

T R

U C

T U

R E

.G P

J Modot

1.25

1.25

1.0

2.0

2.25

3.0

3.0

3.25

1.75

1.5

1.75

2.25

3.5

3.5

3.0

2.89

3.96

3.11

1.0

1.5

2.0

2.25

3.0

4.0

3.75

4.5

1.25

1.0

1.5

2.0

3.0

3.0

2.75

2.25

2.96

5.91

ELEV.702.10

PP

(tsf)

N60 or

[RQD]

ELEV.702.20

PP

(tsf)

N60 or

[RQD]

Qu (ksf)

ELEV.701.80

PP

(tsf)

N60 or

[RQD]

ELEV.702.00

PP

(tsf)

N60 or

[RQD]

Qu (ksf)