MastArmBoringReport.pdf

January 2024 61-78-23-01

REPORT OF

GEOTECHNICAL INVESTIGATION

MAST ARM FOUNDATIONS

SR 20 AT CR 83A (WEST BAY LOOP)

WALTON COUNTY, FLORIDA

FPID: 220918-2-52-29

Prepared For:

COMPREHENSIVE ENGINEERING SERVICES, INC.

201 SOUTH ORANGE AVENUE

SUITE 1300

ORLANDO, FLORIDA 32801

Prepared By:

ENVIRONMENTAL AND GEOTECHNICAL SPECIALISTS, INC.

3676 HARTSFIELD ROAD

TALLAHASSEE, FLORIDA 32303

(850) 386-1253

ENVIRONMENTAL AND GEOTECHNICAL SPECIALISTS, INC.

TALLAHASSEE / JACKSONVILLE / GAINESVILLE / OCALA / INVERNESS / FORT MYERS / WEST PALM BEACH

January 19, 2024

EGS File Number: 61-78-23-01

Comprehensive Engineering Services, Inc.

201 South Orange Avenue Suite 1300 Orlando, Florida 32801

ATTN: Arthur (Art) Shipley, P.E.

Vice President

SUBJECT: Report of Geotechnical Investigation Mast Arm Foundations

SR 20 at CR 83A (West Bay Loop) Walton County, Florida

FPID: 220918-2-52-29

Dear Art:

Environmental and Geotechnical Specialists, Inc. (EGS) has completed the Geotechnical Investigation, as authorized by Comprehensive Engineering Services, Inc. (CES) and the Florida Department of Transportation (FDOT), for the proposed mast arm signal foundations at the intersection of State Road (SR) 20 and County Road (CR) 83A in Walton County, Florida. The proposed mast arm signal foundations are associated with signalization improvements being made at the intersection. Presented in this Report is a summary of the geotechnical investigation, subsurface materials encountered, geotechnical design recommendations, and construction considerations.

SCOPE OF SERVICES

The Scope of Services authorized for this investigation consisted of the following:

• Installation of 2 Standard Penetration Test (SPT) soil borings to depths of 30 feet below the ground surface at the proposed mast arm pole locations;

• Measuring groundwater levels in the installed boreholes;

• Laboratory testing of representative soil samples collected from the soil borings for classification purposes and to evaluate soil index properties;

• Evaluation of the field and laboratory data for development of geotechnical design parameters and recommendations; and,

• Preparation of this Report.

Comprehensive Engineering Services, Inc.

Report of Geotechnical Investigation – Mast Arm Foundations SR 20 at CR 83A (West Bay Loop)

SITE LOCATION AND CONDITIONS

The project site is located at the intersection of SR 20 and CR 83A in Freeport, Walton County, Florida. A Project Location Map has been provided as Figure 1.

The United States Geological Survey (USGS) topographic contours have been overlain on an aerial photography in the Aerial View Map, provided as Figure 2. As can be seen in this Figure, the topography at the intersection is relatively flat with an existing ground surface elevation (EL) of approximately EL 64 to 66 feet at the soil boring locations, as referenced to the North American Vertical Datum of 1988 (NAVD 88).

The intersection is not currently signalized. The site setting is general rural with a residential neighborhood located to the south of the intersection. Overhead and/or buried utilities were observed in proximity to the proposed pole locations.

Two (2) mast arm signals are proposed for the intersection with Pole 1 located to the north of the T-intersection, and Pole 2 located in the southeast corner of the intersection.

SUBSURFACE INVESTIGATION

The subsurface investigation outlined in this Report was conducted in December of 2023.

Dylan Godden, E.I. served as the Staff Geotechnical Engineer. Craig Dunkelberger, P.E.

served as the Geotechnical Engineer of Record. Chandra Samakur, P.E. served as the Senior Geotechnical Engineer providing project oversight and Quality Assurance / Quality Control (QA/QC).

EGS installed 2 SPT soil borings labeled WMA-1 and WMA-2 to depths of 30 feet below the existing ground surface. The soil borings were installed as close as practical to the proposed mast arm foundation locations and labeled to correspond with the assigned pole numbers shown in the Signalization Plan, dated December 2023, provided by CES (e.g., Soil Boring WMA-1 was installed for Pole 1).

A summary of the soil boring labels, depths, and approximate locations are provided in TABLE 1 with a plan view of the soil boring locations shown in Figure 2 and on the Report of Soil Borings plan sheet provided in APPENDIX A.

In order to evaluate the relative strength and uniformity of the subsurface materials, SPT testing with split-spoon sampling was conducted on maximum vertical intervals of 2½ feet to the boring termination depth. To reduce potential impacts to mismarked or unmarked utilities, the soil borings were hand augered within the top 5½ feet coupled with static hand Cone Penetration Index (CPI) tests conducted on 1-foot intervals.

To facilitate uniformity of the subsurface data, CPI “C” values were converted to equivalent SPT “N” values using the correlation N=C/4. SPT sampling was performed with an automatic hammer and in accordance with ASTM D1586.

SR 20 at CR 83A (West Bay Loop)

Soil samples were collected and visually classified in the field by EGS personnel, then placed in sealed bags and transported to the EGS laboratory for classification testing.

The laboratory testing included the determination of water content, organic content, and grain-size distribution. The subsoils have been classified with respect to the Unified Soil Classification System (USCS). Select laboratory test results have been provided in the Report of Soil Borings plan sheets provided in APPENDIX A. The Soil Boring Logs and Soil Classification Data sheets are provided in APPENDICES B and C, respectively.

SUBSURFACE CONDITIONS

Existing Soils - The materials encountered in the soil borings drilled for this investigation consisted of mostly Sand. Within the upper 14 to 18 feet, the Sand was generally in a Loose condition. Below this, the Sand was generally Medium Dense to Dense to the maximum drilled depth of 30 feet.

“Generalized” Design Soil Profiles are provided as Figures 3A and 3B of this report.

Groundwater - Groundwater was encountered between depths of about 13 to 14 feet below the ground surface. Groundwater data, including Estimated “Normal” Seasonal High Groundwater levels, is provided in TABLE 1 and presented in the Report of Soil Borings plan sheets provided in APPENDIX A.

It should be recognized that the groundwater data reflects limited measurements.

Fluctuations in groundwater levels should be anticipated throughout the year in response to rainfall, surrounding development, and changes to drainage from development.

GEOTECHNICAL DESIGN RECOMMENDATIONS

A drilled shaft is the most common foundation type used by the FDOT to support mast arm signals. Based on the subsurface conditions encountered, a spread footing foundation could be considered; however, EGS believes the large footing size required to resist the design loads, and proximity of existing utilities makes this foundation option impractical. EGS recommends drilled shaft foundations be used to support the mast arm signals.

Groundwater - EGS recommends the groundwater level be assumed at the ground surface for design purposes.

SR 20 at CR 83A (West Bay Loop)

Geotechnical Design Parameters - EGS evaluated the subsurface conditions and determined that the Standard Foundation (Drilled Shaft) in FDOT Standard Plans Index 649-030 is appropriate at the location of Pole 1 for a drilled shaft tipped below a depth of 23 feet, or an elevation of about EL 42 feet (NAVD ’88).

At the location of Pole 2, the Standard Foundation (Drilled Shaft) in FDOT Standard Plans Index 649-030 is NOT appropriate due to the loose sands encountered. EGS understands that since the Standard Foundation is not appropriate a design analysis will be performed for sizing of the foundation.

To aid in the design analysis of the drilled shaft foundations, EGS has provided “Generalized” Design Soil Profiles as Figures 3A and 3B. Geotechnical Design Parameters for individual soil layers are provided in TABLES 2A and 2B, with average Combined Geotechnical Design Parameters provided in TABLES 3A and 3B for various shaft tip depths.

Plans Preparation - EGS recommends the Report of Soil Borings plan sheets, provided in APPENDIX A, be included in the Plans. An Electronic copy of the plan sheets has been provided with this Report.

Due to the presence of Loose Sand and groundwater, “cave-off” of the foundation excavations is likely. These soil conditions are not considered to be favorable for use of the Dry Construction Method; therefore, EGS recommends the following note be added to the Plans:

• The subsurface conditions do not meet the requirements for use of Dry Method Shaft Construction.

SR 20 at CR 83A (West Bay Loop)

CLOSURE

The data and results presented in this Report of Geotechnical Investigation are intended for use by Comprehensive Engineering Services, Inc. and the Florida Department of Transportation for the proposed mast arm foundations at the intersection of SR 20 and CR 83A in Walton County, Florida as identified herein. This data may not be used without the expressed written consent of Comprehensive Engineering Services, Inc. and the Florida Department of Transportation. This Report is not intended for any other use and will likely not be applicable. This Report shall not be reproduced, except in full, without the written approval of Environmental and Geotechnical Specialists, Inc. The data and recommendations presented in this Report are based on the borings made at the specific locations and depths noted. Subsurface conditions at other locations may vary significantly from those presented herein. Should data become available which is different from the data presented herein, Environmental and Geotechnical Specialists, Inc. requests the opportunity to review the data and make any modifications to the design recommendations that may be appropriate.

If you have any questions concerning the information contained in this Report, please do not hesitate to call me at (850) 536-8359.

Sincerely, Environmental & Geotechnical Specialists, Inc.

Certificate of Authorization: 6222

Craig E. Dunkelberger, P.E.

Chief Geotechnical Engineer FL P.E. No.: 49932

THIS ITEM HAS BEEN DIGITALLY SIGNED AND SEALED BY

CRAIG E. DUNKELBERGER ON THE DATE ADJACENT TO THE SEAL.

PRINTED COPIES OF THIS DOCUMENT ARE NOT CONSIDERED SIGNED

AND SEALED AND THE SIGNATURE MUST BE VERIFIED ON ANY

ELECTRONIC COPIED.

TABLES

BORING BORING GROUND NORTHING EASTING

LABEL DEPTH 1 SURFACE

ELEVATION 2

DEPTH 1 ELEVATION 2 DEPTH 1 ELEVATION 2

WMA-1 30.0 65 552832 1442904 14.0 51 11 54

WMA-2 30.0 64 552677 1442922 13.0 51 10 54

NOTES: 1. DEPTHS MEASURED BELOW EXISTING GROUND SURFACE.

NOTES: 2. ELEVATIONS ARE APPROXIMATE AND WERE ESTIMATED USING THE TOPOGRAPHY SHOWN ON FIGURE 2 (DATUM: NAVD '88)

TABLE 1

SOIL BORING LOCATION AND GROUNDWATER DATA

MAST ARM FOUNDATIONS

SR 20 AT CR 83A (WEST BAY LOOP)

WALTON COUNTY, FLORIDA

(FEET) (FEET)(FEET) (FEET)

MEASURED GROUNDWATER

ESTIMATED "NORMAL"

SEASONAL HIGH

GROUNDWATER

(FEET) (FEET)

APPROXIMATE DESIGN SPT ANGLE OF TOTAL EFFECTIVE UNDRAINED SOIL

ELEVATION 1 SPT 'N' INTERNAL SOIL UNIT SOIL UNIT SHEAR DESCRIPTION

'N60' VALUE 3 FRICTION WEIGHT WEIGHT STRENGTH

VALUE 2

φ γ γ' c

(FEET) (DEGREES) (LB/FT3) (LB/FT3) (LB/FT2)

65 to 56 7 6 28 115 53 0

LOOSE TO MEDIUM DENSE

FINE SAND

(SP-SM)

56 to 48 9 7 30 115 53 0

LOOSE TO MEDIUM DENSE

SILTY FINE SAND

(SM)

48 to 35 25 20 32 115 53 0

MEDIUM DENSE TO DENSE

FINE SAND

(SP, SP-SM)

NOTES: 1. ESTIMATED USING USGS TOPOGRAPHIC MAPS.

NOTES: 2. SPT 'N60' VALUES ADJUSTED FOR HAMMER EFFICIENCY.

NOTES: 3. FIELD SPT 'N' VALUES.

NOTES: 4. DESIGN SUBSURFACE PROFILE SHOWN IN FIGURE 3A.

TABLE 2A

GEOTECHNICAL DESIGN PARAMETERS - INDIVIDUAL LAYERS

MAST ARM FOUNDATIONS

SR 20 AT CR 83A (WEST BAY LOOP)

POLE 1 (SOIL BORING WMA-1)

ELEVATION 1 SPT 'N' INTERNAL SOIL UNIT SOIL UNIT SHEAR DESCRIPTION

'N60' VALUE 3 FRICTION WEIGHT WEIGHT STRENGTH

VALUE 2

φ γ γ' c

(FEET) (DEGREES) (LB/FT3) (LB/FT3) (LB/FT2)

64 to 60 9 7 29 115 53 0

LOOSE

SILTY FINE SAND

(SM)

60 to 51 7 6 28 115 53 0

LOOSE

FINE SAND

(SP-SM)

51 to 44 15 12 31 115 53 0

MEDIUM DENSE

FINE TO MEDIUM SAND

(SP-SM)

44 to 34 10 8 30 115 53 0

MEDIUM DENSE

FINE SAND

(SP-SM)

NOTES: 1. ESTIMATED USING USGS TOPOGRAPHIC MAPS.

NOTES: 2. SPT 'N60' VALUES ADJUSTED FOR HAMMER EFFICIENCY.

NOTES: 3. FIELD SPT 'N' VALUES.

NOTES: 4. DESIGN SUBSURFACE PROFILE SHOWN IN FIGURE 3B.

TABLE 2B

GEOTECHNICAL DESIGN PARAMETERS - INDIVIDUAL LAYERS

MAST ARM FOUNDATIONS

SR 20 AT CR 83A (WEST BAY LOOP)

POLE 2 (SOIL BORING WMA-2)

ELEVATION SPT 'N' INTERNAL SOIL UNIT SOIL UNIT SHEAR DESCRIPTION

OF SHAFT TIP 1,2 'N60' VALUE 4 FRICTION WEIGHT WEIGHT STRENGTH

VALUE 3

φ γ γ' c

(FEET) (DEGREES) (LB/FT3) (LB/FT3) (LB/FT2)

65 to 56 7 6 - - 5 - - 5 - - 5 - - 5

LOOSE TO MEDIUM DENSE

FINE SAND

(SP-SM)

56 to 48 7 6 28 115 53 0

LOOSE TO MEDIUM DENSE

SILTY FINE SAND

(SM)

48 to 42 12 10 30 115 53 0

42 to 35 15 12 31 115 53 0

NOTES: 1. ELEVATIONS ARE APPROXIMATE AND WERE DETERMINED USING GOOGLE EARTH.

NOTES: 2. COMBINED SOIL LAYER PARAMETERS SHOWN ARE AVERAGE PARAMETER VALUES OF ALL SOILS ABOVE THE SHAFT TIP. THESE COMBINED SOIL LAYER NOTES: 2. PARAMETERS ARE INTENDED TO BE APPLIED OVER THE ENTIRETY OF THE EMBEDMENT DEPTH.

NOTES: 3. SPT 'N60' VALUES ADJUSTED FOR HAMMER EFFICIENCY.

NOTES: 4. FIELD SPT 'N' VALUES.

NOTES: 5. MINIMUM SHAFT EMBEDMENT DEPTH OF 9 FEET IS ASSUMED; THEREFORE, NO COMBINED PARAMETERS HAVE BEEN PROVIDED FOR THESE LAYERS.

NOTES: 6. DESIGN SUBSURFACE PROFILE SHOWN IN FIGURE 3A.

TABLE 3A

GEOTECHNICAL DESIGN PARAMETERS - COMBINED LAYERS

MAST ARM FOUNDATIONS

SR 20 AT CR 83A (WEST BAY LOOP)

WALTON COUNTY, FLORIDA

POLE 1 (SOIL BORING WMA-1)

SOIL PARAMETERS MEET MINIMUM CRITERIA PER STANDARD PLAN INDEX 649-030 FOR SHAFTS TIPPED BELOW ELEVATION 42 FEET.

MEDIUM DENSE TO DENSE

FINE SAND

(SP, SP-SM)

ELEVATION SPT 'N' INTERNAL SOIL UNIT SOIL UNIT SHEAR DESCRIPTION

OF SHAFT TIP 1,2 'N60' VALUE 4 FRICTION WEIGHT WEIGHT STRENGTH

VALUE 3

φ γ γ' c

(FEET) (DEGREES) (LB/FT3) (LB/FT3) (LB/FT2)

64 to 60 9 7 - - 5 - - 5 - - 5 - - 5

LOOSE

SILTY FINE SAND

(SP-SM)

60 to 51 7 6 - - 5 - - 5 - - 5 - - 5

LOOSE

FINE SAND

(SP-SM)

51 to 44 10 8 30 115 53 0

MEDIUM DENSE

FINE TO MEDIUM SAND

(SP-SM)

44 to 39 10 8 30 115 53 0

39 to 34 10 8 30 115 53 0

NOTES: 1. ELEVATIONS ARE APPROXIMATE AND WERE DETERMINED USING GOOGLE EARTH.

NOTES: 2. COMBINED SOIL LAYER PARAMETERS SHOWN ARE AVERAGE PARAMETER VALUES OF ALL SOILS ABOVE THE SHAFT TIP. THESE COMBINED SOIL LAYER NOTES: 2. PARAMETERS ARE INTENDED TO BE APPLIED OVER THE ENTIRETY OF THE EMBEDMENT DEPTH.

NOTES: 3. SPT 'N60' VALUES ADJUSTED FOR HAMMER EFFICIENCY.

NOTES: 4. FIELD SPT 'N' VALUES.

NOTES: 5. MINIMUM SHAFT EMBEDMENT DEPTH OF 13 FEET IS ASSUMED; THEREFORE, NO COMBINED PARAMETERS HAVE BEEN PROVIDED FOR THESE LAYERS.

NOTES: 6. DESIGN SUBSURFACE PROFILE SHOWN IN FIGURE 3B.

TABLE 3B

GEOTECHNICAL DESIGN PARAMETERS - COMBINED LAYERS

MAST ARM FOUNDATIONS

SR 20 AT CR 83A (WEST BAY LOOP)

WALTON COUNTY, FLORIDA

POLE 2 (SOIL BORING WMA-2)

MEDIUM DENSE

FINE SAND

(SP-SM)

SOIL PARAMETERS DO NOT MEET MINIMUM CRITERIA PER STANDARD PLAN INDEX 649-030 FOR SHAFTS; THEREFORE, AN ANALYSIS IS REQUIRED.

FIGURES

DRAWN:

D. GODDEN, E.I.

CHECKED:

A. CRAIG, E.I.

ENVIRONMENTAL AND GEOTECHNICAL

SPECIALISTS, INC.

3676 HARTSFIELD ROAD

TALLAHASSEE, FLORIDA 32303

OFFICE #: (850) 386-1253

TITLE:

PROJECT LOCATION MAP

MAST ARM FOUNDATIONS

SR 20 AT CR 83A (WEST BAY ROAD)

WALTON COUNTY, FLORIDA

ENGINEER:

C. DUNKELBERGER, P.E.

CLIENT:

COMPREHENSIVE ENGINEERING SERVICES, INC.

PROJ. NO.:

61-78-23-01

SCALE:

NOT TO SCALE

DATE:

JANUARY 2024

FIGURE NO.:

PROJECT LOCATION

NOT TO SCALE

C. DUNKELBERGER, P.E.

A

A

WMA-2

WMA-1

DRAWN:

ENGINEER:

CLIENT:

CHECKED:

PROJ. NO.: SCALE: DATE: FIGURE NO.:

TITLE:

ENVIRONMENTAL AND GEOTECHNICAL

SPECIALISTS, INC.

3676 HARTSFIELD ROAD

TALLAHASSEE, FLORIDA 32303

OFFICE #: (850) 386-1253

JANUARY 2024 2

AERIAL VIEW MAP

MAST ARM FOUNDATIONS

SR 20 AT CR 83A (WEST BAY LOOP)

WALTON COUNTY, FLORIDA

A. CRAIG, E.I.D. GODDEN, E.I.

COMPREHENSIVE ENGINEERING SERVICES, INC.

61-78-23-01

0 60

Feet

Legend A Approximate Soil Boring Location

USGS Topographic Contours (2-feet)

AS SHOWN

SR 20

CO

UN

TY

HI

GH

WA

Y 8 3A

W

P

P R

O X I

M A

T E

E

L E

V A

T I O

N

(F

E E

T

N

V D

'8

) A

P P

R O

X I

M A

T E

E

L E

V A

T I O

N

(F

E E

V D

'8

"GENERALIZED" DESIGN SOIL PROFILE

NOTES

2.

1.

PENETRATION.

PENETRATION TEST (SPT) N-VALUES FOR 12 INCH

NUMBERS LEFT OF BORING INDICATE STANDARD

GEOTECHNICAL DESIGN PARAMETERS.

SEE TABLE 2A AND 3A FOR ADDITIONAL

ϒ'=53 PCF

ϕ=28°

N =7

N=6

ϒ'=53 PCF

ϕ=32°

ϒ'=53 PCF

ϕ=29°

N =25

N=20

(SP-SM)

FINE SAND

LOOSE TO MEDIUM DENSE

(SM)

SILTY FINE SAND

LOOSE TO MEDIUM DENSE

N =9

N=7

DATE:

CHECKED:

SCALE:

61-78-23-01

DRAWN:

ENGINEER:

CLIENT:

PROJ. NO.:

AS SHOWN 3A

FIGURE:

SPECIALISTS, INC.

ENVIRONMENTAL AND GEOTECHNICAL

TITLE:

JANUARY 2024

OFFICE #: (850) 386-1253

TALLAHASSEE, FLORIDA 32303

3676 HARTSFIELD ROAD

D. GODDEN, E.I.

C. DUNKELBERGER, P.E.

K. SWEENEY, P.E.

CES, INC.

WALTON COUNTY, FLORIDA

SR 20 AT CR 83A (WEST BAY LOOP)

MAST ARM FOUNDATIONS

"GENERALIZED" DESIGN SOIL PROFILE

(SP, SP-SM)

FINE SAND

MEDIUM DENSE TO DENSE

ANGLE OF INTERNAL FRICTION (DEGREES)

FIELD SPT "N" VALUE

EXISTING GROUND SURFACE

N ϕ

N

FOR HAMMER EFFICIENCY)

DESIGN SPT "N" VALUE (CORRECTED

DESIGN GROUNDWATER LEVEL

ϒ' EFFECTIVE UNIT WEIGHT (PCF)

POLE 1 (SOIL BORING WMA-1)

N

*7

*7

*4

*4

*5

ELEVATION 65 FEET

LEGEND

P

P R

O X I

M A

T E

E

L E

V A

T I O

N

(F

E E

V D

'8

) A

P P

R O

X I

M A

T E

E

L E

V A

T I O

N

(F

E E

V D

'8

"GENERALIZED" DESIGN SOIL PROFILE

ϒ'=53 PCF

ϕ=28°

ϒ'=53 PCF

ϕ=31°

ϒ'=53 PCF

ϕ=30°

N =10

N=8

NOTES

2.

1.

PENETRATION.

PENETRATION TEST (SPT) N-VALUES FOR 12 INCH

NUMBERS LEFT OF BORING INDICATE STANDARD

GEOTECHNICAL DESIGN PARAMETERS.

SEE TABLE 2B AND 3B FOR ADDITIONAL

(SP-SM)

FINE SAND

MEDIUM DENSE

ϒ'=53 PCF

ϕ=29°

DATE:

CHECKED:

SCALE:

61-78-23-01

DRAWN:

ENGINEER:

CLIENT:

PROJ. NO.:

AS SHOWN 3B

FIGURE:

SPECIALISTS, INC.

ENVIRONMENTAL AND GEOTECHNICAL

TITLE:

JANUARY 2024

OFFICE #: (850) 386-1253

TALLAHASSEE, FLORIDA 32303

3676 HARTSFIELD ROAD

D. GODDEN, E.I.

C. DUNKELBERGER, P.E.

K. SWEENEY, P.E.

CES, INC.

WALTON COUNTY, FLORIDA

SR 20 AT CR 83A (WEST BAY LOOP)

MAST ARM FOUNDATIONS

"GENERALIZED" DESIGN SOIL PROFILE

N =9

N=7

N =7

N=6

N =15

N=12

(SP-SM)

FINE TO MEDIUM SAND

MEDIUM DENSE

(SP-SM)

FINE SAND

LOOSE

(SM)

SILTY FINE SAND

LOOSE

ANGLE OF INTERNAL FRICTION (DEGREES)

FIELD SPT "N" VALUE

EXISTING GROUND SURFACE

N ϕ

N

FOR HAMMER EFFICIENCY)

DESIGN SPT "N" VALUE (CORRECTED

DESIGN GROUNDWATER LEVEL

ϒ' EFFECTIVE UNIT WEIGHT (PCF)

POLE 2 (SOIL BORING WMA-2)

N

*7

*5

*7

*7

*5

ELEVATION 64 FEET

LEGEND

APPENDIX A

GEOTECHNICAL PLAN SHEET

SOIL BORING LOCATION MAP

$DATE$$USER$ $FILE$$TIME$

220918-2-52-29 WALTON SR 20

ROAD NO. FINANCIAL PROJECT IDCOUNTY

DATE DESCRIPTION

REVISIONS

DATE DESCRIPTION

NO.

SHEETSTATE OF FLORIDA

DEPARTMENT OF TRANSPORTATION

REPORT OF SOIL BORINGS

CRAIG E. DUNKELBERGER, P.E.

ENVIRONMENTAL & GEOTECHNICAL SPECIALISTS, INC.

3676 HARTSFIELD ROAD

TALLAHASSEE, FLORIDA 32303

P.E. NO.: 49932

T H

E

O F

F I

C I

L

R

C O

D

I

S

E E

T

E C

T R

O N

C

G I

T A

L

Y

G N

A L

U

D

L E

G

A

C

-200=

OC=

Wc=

*N

(SP)

-200 SIEVE

LABORATORY TESTING RESULTS

LEGEND

WATER CONTENT (%)

ORGANIC CONTENT (%)

N-VALUE EQUIVALENT (NOTE 2)

MEASURED GROUNDWATER LEVEL

SOIL BORING LOCATION

(SM)

SILTY FINE SAND

UNIFIED SOIL CLASSIFICATION GROUP

(SP/SP-SM)

FINE SAND

HIGH GROUNDWATER LEVEL

ESTIMATED "NORMAL" SEASONAL

N

15 60

Feet

NOTES

TOPOGRAPHIC MAPS.

ELEVATIONS ARE APPROXIMATE AND WERE ESTIMATED USING USGS

PERFORMING THE EXTRAPOLATION.

DATA TO OTHER LOCATIONS IS THE SOLE RESPONSIBILITY OF THE PERSON

EXCEPT AT THE LOCATIONS OF THE SOIL BORING. EXTRAPOLATION OF THE SOIL

ARE FOR THE SOIL BORING ONLY AND MAY NOT APPLY TO ANY OTHER LOCATIONS

SOIL DESCRIPTIONS, TEST DATA, AND STANDARD PENETRATION VALUES SHOWN

FLUCTUATIONS SHOULD BE ANTICIPATED.

ENCOUNTERED DURING THE SUBSURFACE INVESTIGATION. GROUNDWATER LEVEL

MEASURED GROUNDWATER LEVEL SHOWN IS THE GROUNDWATER LEVEL

CONE PENTROMETER TESTS.

N-VALUES DENOTED WITH AN ASTERISK (*) WERE DERIVED FROM STATIC HAND

N-VALUES FOR 12 INCH PENETRATION (UNLESS OTHERWISE NOTED).

NUMBERS LEFT OF BORING INDICATE STANDARD PENETRATION TEST (SPT)

5.

4.

3.

2.

1.

GREATER THAN 40

24 - 40

8 - 24

3 - 8

LESS THAN 3

GREATER THAN 24

12 - 24

6 - 12

3 - 6

1 - 3

LESS THAN 1

RELATIVE DENSITY

GRANULAR MATERIALS

(BLOWS/12 IN.)

SPT

CONSISTENCY

SILTS AND CLAYS

(BLOWS/12 IN.)

SPT

HARD

VERY STIFF

STIFF

FIRM

SOFT

VERY SOFT

VERY DENSE

DENSE

MEDIUM DENSE

LOOSE

VERY LOOSE

AUTOMATIC HAMMER

SPLIT-SPOON:

HAMMER WEIGHT: 140 lbs.

AVG. HAMMER DROP: 30.0 in.

OUTSIDE DIAMETER: 2.0 in.

INSIDE DIAMETER: 1.375 in.

WMA-1

SR 20 EASTBOUND

SR 20 WESTBOUND

C R

A

W E

B

Y

L

O O

P

WMA-2

-200=9

Wc=4

-200=7

Wc=4

-200=12

Wc=8

-200=4

Wc=22

-200=9

Wc=22

-200=23

Wc=11

-200=11

Wc=6

-200=9

Wc=7

-200=5

Wc=21

-200=6

Wc=19

OC=1.9

-200=5

Wc=24

N

*7

*7

*4

*4

*5

N

*7

*5

*7

*7

*5

RIG

HAMMER

DRILLER

DATE

ELEV.

EASTING

NORTHING

BOR #

RIG

HAMMER

DRILLER

DATE

ELEV.

EASTING

NORTHING

BOR #

FINE SAND (SP-SM)

LOOSE TO MEDIUM DENSE DARK GRAY TO BROWN

SILTY FINE SAND (SM)

LOOSE TO MEDIUM DENSE BROWN

SILTY FINE SAND (SM)

LOOSE GRAY TO BROWN

FINE SAND (SP-SM)

LOOSE TO MEDIUM DENSE BROWN

MEDIUM SAND (SP-SM)

MEDIUM DENSE GRAY

FINE SAND (SP-SM)

MEDIUM DENSE DARK GRAY TO GRAY

$DATE$$USER$ $FILE$$TIME$

220918-2-52-29 WALTON SR 20

ROAD NO. FINANCIAL PROJECT IDCOUNTY

DATE DESCRIPTION

REVISIONS

DATE DESCRIPTION

NO.

SHEETSTATE OF FLORIDA

DEPARTMENT OF TRANSPORTATION

REPORT OF SOIL BORINGS

CRAIG E. DUNKELBERGER, P.E.

ENVIRONMENTAL & GEOTECHNICAL SPECIALISTS, INC.

3676 HARTSFIELD ROAD

TALLAHASSEE, FLORIDA 32303

P.E. NO.: 49932

T

F I

C I

C O

E E

T

E C

T R

O N

C

G I

T A

L

Y

G N

A L

D

L E

G

A

C

D-25

AUTOMATIC

W. CHOMAT

12/19/2023

64 FEET

1442922

552677

WMA-2

AT ELEV. 35 FEET

BORING TERMINATED

AT ELEV. 34 FEET

BORING TERMINATED

D-25

AUTOMATIC

W. CHOMAT

12/19/2023

65 FEET

1442904

552832

WMA-1

FINE SAND (SP, SP-SM)

MEDIUM DENSE TO DENSE DARK GRAY TO GRAYA

P P

R O

X I

M A

T E

E

L E

V A

T I O

N

(F

E E

V D

'8

) A

P P

R O

X I

M A

T E

E

L E

V A

T I O

N

(F

E E

V D

'8

APPENDIX B

SOIL BORING LOGS

2.5

7.5

LOOSE

DARK GRAY

FINE SAND

LOOSE

BROWN

FINE SAND

MEDIUM DENSE

BROWN

FINE SAND

MEDIUM DENSE

BROWN

SILTY FINE SAND

LOOSE

BROWN

SILTY FINE SAND

MEDIUM DENSE

DARK GRAY

FINE SAND

DENSE

GRAY

FINE SAND

DENSE

GRAY

FINE SAND

SP-SM

SP-SM

SM

SM

SP

SP-SM

SP-SM

ORG%=

2.1

-200%=9

-200%=7

-200%=12

ORG%=

0.3

-200%=4

ORG%=

0.6

ORG%=

0.3

-200%=9

PROJECT: SR 20 AT CR 83A (WEST BAY LOOP)

CLIENT: CES, INC.

PROJECT NO.: 61-78-23-01

PROJECT LOCATION: WALTON COUNTY, FLORIDA

BORING NO.: WMA-1

DRILLER: W. CHOMAT

HAMMER TYPE: AUTOMATIC

NORTHING: 552832

EASTING: 1442904

ELEVATION (FEET): 65

DATE: 12/19/2023

FLUID LOSS: NONE

DEPTH TO WATER: INITIAL: 14.0' 24 HR: N/M CAVING: NONE

NOTES: N/M MEANS NOT MEASURED

N/A MEANS NOT AVAILABLE

D E

P T

H

M E

T E

R S

D E

P T

H

F E

E T

S A

M P

L E

S Y

M B

O L

DESCRIPTION USCS

TEST

RESULTS

Wc

Wc (%)

N

N-Value

T h is i n fo rm a ti o n p e rt a in s o n ly t o t h is b o ri n g a n d s h o u ld n o t b e i n te rp re te d a s b e in g i n d ic it iv e o f th e s it e

2.5

7.5

LOOSE

GRAY

SILTY FINE SAND

LOOSE

BROWN

SILTY FINE SAND

LOOSE

BROWN

FINE SAND

MEDIUM DENSE

BROWN

FINE SAND

MEDIUM DENSE

GRAY

MEDIUM SAND

MEDIUM DENSE

DARK GRAY

FINE SAND

MEDIUM DENSE

GRAY

FINE SAND

SM

SP-SM

SP-SM

SP-SM

SP-SM

-200%=23

-200%=11

-200%=9

-200%=5

ORG%=

0.5

-200%=5

ORG%=

1.9

ORG%=

0.8

-200%=6

PROJECT: SR 20 AT CR 83A (WEST BAY LOOP)

CLIENT: CES, INC.

PROJECT NO.: 61-78-23-01

PROJECT LOCATION: WALTON COUNTY, FLORIDA

BORING NO.: WMA-2

DRILLER: W. CHOMAT

HAMMER TYPE: AUTOMATIC

NORTHING: 552832

EASTING: 1442904

ELEVATION (FEET): 64

DATE: 12/19/2023

FLUID LOSS: NONE

DEPTH TO WATER: INITIAL: 13.0' 24 HR: N/M CAVING: NONE

NOTES: N/M MEANS NOT MEASURED

N/A MEANS NOT AVAILABLE

D E

P T

H

M E

T E

R S

D E

P T

H

F E

E T

S A

M P

L E

S Y

M B

O L

DESCRIPTION USCS

TEST

RESULTS

Wc

Wc (%)

N

N-Value

T h is i n fo rm a ti o n p e rt a in s o n ly t o t h is b o ri n g a n d s h o u ld n o t b e i n te rp re te d a s b e in g i n d ic it iv e o f th e s it e

APPENDIX C

SOIL CLASSIFICATION DATA

0.0-0.5 7 2.1 -- SP-SM LOOSE

DARK GRAY

FINE SAND

1.0-1.5 4 100 100 99 69 29 14 9 7 SP-SM LOOSE

BROWN

FINE SAND

2.0-2.5 10 7 SP-SM LOOSE

BROWN

FINE SAND

3.0-3.5 5 4 SP-SM LOOSE

BROWN

FINE SAND

4.0-4.5 5 4 SP-SM LOOSE

BROWN

FINE SAND

5.0-5.5 4 100 100 99 69 27 11 7 5 SP-SM LOOSE

BROWN

FINE SAND

6.0-7.5 6 6 SP-SM LOOSE

BROWN

FINE SAND

7.5-9.0 10 12 SP-SM MEDIUM DENSE

BROWN

FINE SAND

9.0-10.5 8 10 SM MEDIUM DENSE

BROWN

SILTY FINE SAND

10.5-12.0 8 100 100 98 73 33 17 12 7 SM LOOSE

BROWN

SILTY FINE SAND

12.5-14.0 14 4 SM LOOSE

BROWN

SILTY FINE SAND

15.0-16.5 19 7 SM LOOSE

BROWN

SILTY FINE SAND

17.0-19.0 20 0.3 18 SP MEDIUM DENSE

DARK GRAY

FINE SAND

ENVIRONMENTAL AND GEOTECHNICAL SPECIALISTS, INC.

SOIL CLASSIFICATION DATA

Project: SR 20 AT CR 83A (WEST BAY LOOP)

Client: CES, INC. Project No.: 61-78-23-01

Boring: WMA-1 Location: WALTON COUNTY, FLORIDA

DEPTH

(FEET)

Wc

-4

-10

-20

-40

-60

-100

-200

LL PI

Org.

N Value

USCS Description

20.0-21.5 22 100 100 96 63 22 6 4 0.6 20 SP MEDIUM DENSE

FINE SAND

22.5-24.0 21 0.3 16 SP MEDIUM DENSE

DARK GRAY

FINE SAND

25.0-26.5 22 100 100 99 92 61 22 9 25 SP-SM DENSE

GRAY

FINE SAND

28.0-30.0 20 27 SP-SM DENSE

GRAY

FINE SAND

ENVIRONMENTAL AND GEOTECHNICAL SPECIALISTS, INC.

SOIL CLASSIFICATION DATA

Project: SR 20 AT CR 83A (WEST BAY LOOP)

Client: CES, INC. Project No.: 61-78-23-01

Boring: WMA-1 Location: WALTON COUNTY, FLORIDA

DEPTH

(FEET)

Wc

-4

-10

-20

-40

-60

-100

-200

LL PI

Org.

N

0.0-0.5 14 -- SM LOOSE

GRAY

SILTY FINE SAND

1.0-1.5 11 100 100 97 83 67 46 23 7 SM LOOSE

GRAY

SILTY FINE SAND

2.0-2.5 7 5 SM LOOSE

GRAY

SILTY FINE SAND

3.0-3.5 5 7 SM LOOSE

BROWN

SILTY FINE SAND

4.0-4.5 6 100 100 99 73 32 16 11 7 SP-SM LOOSE

BROWN

FINE SAND

5.0-5.5 6 5 SP-SM LOOSE

BROWN

FINE SAND

6.0-7.5 11 3 SP-SM LOOSE

BROWN

FINE SAND

7.5-9.0 8 6 SP-SM LOOSE

BROWN

FINE SAND

9.0-10.5 7 100 100 98 73 33 15 9 7 SP-SM LOOSE

BROWN

FINE SAND

10.5-12.0 10 9 SP-SM MEDIUM DENSE

BROWN

FINE SAND

12.5-14.0 15 12 SP-SM MEDIUM DENSE

BROWN

FINE SAND

15.0-16.5 21 100 100 98 32 10 6 5 17 SP-SM MEDIUM DENSE

GRAY

MEDIUM SAND

17.0-19.0 21 8 SP-SM MEDIUM DENSE

GRAY

MEDIUM SAND

ENVIRONMENTAL AND GEOTECHNICAL SPECIALISTS, INC.

SOIL CLASSIFICATION DATA

Project: SR 20 AT CR 83A (WEST BAY LOOP)

Client: CES, INC. Project No.: 61-78-23-01

Boring: WMA-2 Location: WALTON COUNTY, FLORIDA

DEPTH

(FEET)

Wc

-4

-10

-20

-40

-60

-100

-200

LL PI

Org.

N

20.0-21.5 25 0.5 10 SP-SM MEDIUM DENSE

FINE SAND

22.5-24.0 24 100 100 99 84 26 8 5 1.9 8 SP-SM MEDIUM DENSE

DARK GRAY

FINE SAND

25.0-26.5 24 0.8 8 SP-SM MEDIUM DENSE

DARK GRAY

FINE SAND

28.0-30.0 19 100 100 99 90 60 20 6 14 SP-SM MEDIUM DENSE

GRAY

FINE SAND

ENVIRONMENTAL AND GEOTECHNICAL SPECIALISTS, INC.

SOIL CLASSIFICATION DATA

Project: SR 20 AT CR 83A (WEST BAY LOOP)

Client: CES, INC. Project No.: 61-78-23-01

Boring: WMA-2 Location: WALTON COUNTY, FLORIDA

DEPTH

(FEET)

Wc

-4

-10

-20

-40

-60

-100

-200

LL PI

Org.

N