USACE_2015_Feasability_Study_-_AppendixD_Geotechnical.pdf

FLAGLER COUNTY, FLORIDA

HURRICANE AND STORM DAMAGE REDUCTION PROJECT

FINAL INTEGRATED FEASIBILITY STUDY AND

ENVIRONMENTAL ASSESSMENT

Appendix D

Geotechnical

USACE JACKSONVILLE DISTRICT

Appendix D

Geotechnical

FLAGLER COUNTY, FLORIDA

HURRICANE AND STORM DAMAGE REDUCTION PROJECT

INTEGRATED FEASIBILITY STUDY AND ENVIRONMENTAL

ASSESSMENT

March 2014

TABLE OF CONTENTS

Background

1.1 Regional Geology

1.2 Local Geology

2 Native Beach

2.1 General

2.2 Native Beach Sampling and Analysis

3 Borrow AreaS

3.1 Sand Search Investigations

3.2 Proposed Borrow Areas 2A, 2B, and 2C

3.2.1 Borrow Area 2A

3.2.2 Borrow Area 2B

3.2.3 Borrow Area 2C

3.2.4 Borrow Areas 2 Combined

3.3 Proposed Borrow Area 3A

4 Compatibility of the Borrow Area with the Beaches

4.1 Grain size Distribution

4.2 Overfill and renourishment Factor

4.2.1 Overfill Factor

4.2.2 Renourishment Factor

4.3 Compatibility Summary

INDEX OF TABLES

Table 1: Flagler Beaches

Table 2: Flagler Beach, Beach Sediment Analysis

Table 3: Proposed Borrow Areas 2A, 2B, 2C

Table 4: Sediment Characteristics of Proposed Borrow Areas 2A, 2B, 2C

Table 5: Proposed Borrow Area 3A

Table 6: Sediment Characteristics of Proposed Borrow Area 3A

Appendix D, Geotechnical. Flagler County, Shore Protection Project Page 2 of 287

Table 7: Sediment Analysis Summary

Table 8: Summary of Sediment characteristics

INDEX OF FIGURES

Figure 1. Beach Transect with Beach Sampling Locations

Figure 2. Borrow Area 2, 2011 Core Borings

Figure 3: Borrow Area 3, 2011 Core Borings

INDEX OF PLATES

Plate 1: Overview: Flagler County Beach and Borrow Area Locations

Plate 2: Redefined Off‐shore Borrow Areas for Flagler County

Plate 3: Boring locations for Flagler County

Plate 4: Bathometry Borrow Area 2

Plate 5: Bathometry Borrow Area 3

APPENDICES

Borrow Areas: Boring Logs and Laboratory Testing Results

Native Beach Laboratory Results

Appendix D, Geotechnical. Flagler County, Shore Protection Project Page 3 of 287

1 BACKGROUND

This report includes a description of the regional and local geology of Flagler County, a sediment characterization of the native beach and a preliminary borrow area design. All boring logs and laboratory testing results are listed in Table 2 through Table 5 and depicted in Plates 1 through Plate 5. Boring logs and laboratory results are attached in the Appendix.

Additional borings in the borrow areas will be needed during the design phase of this project.

1.1 REGIONAL GEOLOGY

The Florida Peninsula occupies a portion of the much larger geologic unit called the Florida

Plateau. Deep water in the Gulf of Mexico is separated from deep water of the Atlantic Ocean by this partially submerged platform nearly 500 miles long and 450 miles wide. In the last 200 million years, the plateau has been alternately dry land or covered by shallow seas. During that time up to 20,000 feet of carbonate and marine sediments were deposited. There has been a tilting of the Florida Plateau about its longitudinal axis. The west coast is partially submerged, as indicated by the wide estuaries and offshore channels, while the east coast is correspondingly elevated, showing the characteristics of an emergent coastline.

During the last million years, a series of four glacial periods, or ice ages, brought about significant changes in sea level. As a result of these sea level fluctuations, the Florida peninsula was again covered and uncovered by shallow seas. Following the first glacial period, sea level rose 270 ft. above its present level. Dry land on the Florida peninsula was then restricted to a few small islands along the central Florida ridge and in northeast Florida.

About 100,000 years ago, the last glacial period began. Sea level fell to 300 feet below its present level and the Florida Plateau emerged as dry land. Approximately 15,000 years ago, sea level began its most recent rise towards present sea level (Shinn, 1988). Sea level rose at an average rate of 30 feet per 1,000 years. About 7,000 years ago, the rate of sea level rise slowed when the sea level was about 30 feet below its present level. It was at this most recent slowing of sea level rise that the modern barrier islands of southeast peninsular Florida formed.

1.2 LOCAL GEOLOGY

Flagler County’s approximately 19 Miles of open‐ocean shoreline has no embayment or inlets.

The barrier island extends over 50 Miles uninterrupted from Matanzas Inlet to the north to

Ponce de Leon Inlet in the south. The barrier island is separated from the mainland by the

Matanzas River, Smith Creek, and the Intracoastal Waterway.

Appendix D, Geotechnical. Flagler County, Shore Protection Project Page 4 of 287

Beaches along Flagler County are shelly and of a pinkish orange color. This is due the shell material derived from the Anastasia formation which outcrops off‐shore of Flagler county and also at Hammock beach in northern Flagler county. The Pleistocene Anastasia Formation is comprised of clay, sand, and shell, and of coquina rock, which is composed of shells and quartz lithified in a calcite matrix. The Anastasia Formation reaches thickness of 20 to 140 feet.

Pliocene/Miocene sediments underlay the Anastasia formation and are comprised of interbedded layers of marine, fine to medium sand, shell and green, calcareous, silty clay.

These sediments vary in thickness (20‐100 feet) throughout the county.

Underneath the Pliocene/Miocene Sediments follow the deposits of the Hawthorn Group which is of middle Miocene age and consists mainly of dark gray and olive green sandy to silty clay, clay, clayey sand, and thin layers of sandy limestone, and contains moderate to large amounts of black phosphate sand, granules, and pebbles. The Hawthorn Group ranges in thickness from a few feet to 120 feet. The formation varies in thickness from place to place because of both an irregular upper and lower surface. The Hawthorn Group occurs at depths ranging from approximately 30 to 240 feet below land surface.

2 NATIVE BEACH

2.1 GENERAL

The original study area included the Flagler County shoreline at Marineland, Painters Hill, Beverly Beach and Flagler Beach. Locations are listed by FDEP Reference Monument (R‐

Monument) ranges in Table 1 and are depicted on Plate B‐1. Marineland, Painters Hill, Beverly

Beach, and part of Flagler Beach were excluded in the course of the study due to the lack of infrastructure needing protection. Therefore the recommended plan for the project includes only the southern part of Flagler Beach from R‐80 to R‐94.

Table 1: Flagler Beaches

Beach FDEP Reference Monument (R‐monument)

Marineland R‐1 to R‐4

Painters Hill R‐50 to R‐60

Beverly Beach R‐60 to R‐67

Flagler Beach R‐67 to R‐101

Appendix D, Geotechnical. Flagler County, Shore Protection Project Page 5 of 287

2.2 NATIVE BEACH SAMPLING AND ANALYSIS

Beach sediment sampling was performed by the USACE in August 2012 along the following representative beach profile lines: R‐81, R‐85, R‐89, and R‐93. Sampling profile line locations are depicted on the attached Plate B‐2.

Beach sediment samples were collected along the respective profile lines at the following locations as shown in Figure 1: Toe of Dune, Berm, Mid‐tide, and ‐3, ‐5, ‐10, ‐15, and ‐20 below

Mean Sea Level.

Figure 1. Beach Transect with Beach Sampling Locations

Due to the severe erosion, some of the beaches don’t show this typical profile. At some locations, the dune is replaced by revetment, and therefore no sample was collected.

All samples were analyzed for grain size, visual shell and Munsell Color. Carbonate analysis was performed on representative samples. The associated gradation curves and granularmetric reports are presented in the Appendix.

An arithmetic composite sample was created from all samples. The granulometric results using the method of moments for each sample and for the composite sample are summarized in

Table 2.

The test results characterize the sediments at Flagler Beach as poorly‐graded, fine‐grained quartz sands. The mean grain size ranges between 0.14 mm (2.84 phi) and 0.67 mm (0.58 phi) averaging at 0.28 mm (1.85 phi). The carbonate content ranges from 8% to 64% averaging at

25%. The visual shell averages 23%, and the color of the sand is generally light gray to pinkish gray. Samples collected at the berm and at mid‐tide locations have especially high shell contents caused by the deposits from the Anastasia formation, which also causes the typical pinkish grey color of the Flagler County beaches.

Appendix D, Geotechnical. Flagler County, Shore Protection Project Page 6 of 287

Table 2: Flagler Beach, Beach Sediment Analysis

Point

ID

Number USCS Mean (mm)

Mean (phi)

Gravel* (Shell)

Silt ** Std.

Dev.

(phi)

Visual Shell

Carbo‐ nate %

Munsell Color (wet)

R‐81

Toe of Dune Dune not existent. No sample taken.

Berm SP 0.43 1.22 0 0.07 0.9 42.9 40.3 7.5YR 7/2

Mid‐Tide SP 0.41 1.29 0 0.05 1 42.8 7.5YR 7/2

‐3 SP 0.17 2.56 0 0.81 0.54 2.8 10YR 7/1

‐5 SP 0.17 2.56 0 0.64 0.47 1.9 10YR 7/1

‐10 SP 0.17 2.56 0.18 0.87 0.79 5.7 8.3 10YR 7/1

‐15 SP 0.18 2.47 0.14 1.1 0.97 8.9 10YR 7/1

‐20 SP 0.14 2.84 0 1.21 0.51 2 10YR 6/1

R‐85

Toe of Dune Dune not existent. No sample taken.

Berm SP 0.37 1.43 0.08 0.11 0.89 31.9 7.5YR 7/2

Mid‐Tide SP 0.27 1.89 0 0.32 0.82 22.6 7.5YR 7/1

‐3 SP 0.25 2.00 0 0.84 1.02 21.5 7.5YR 7/3

‐5 SP 0.22 2.18 0 0.81 0.88 16.1 7.5YR 7/1

‐10 SP 0.16 2.64 0.01 1.14 0.72 7.4 8 10YR 7/1

‐15 SP 0.17 2.56 0.13 1.5 0.84 8.3 10YR 7/2

‐20 SP 0.14 2.84 0.02 1.18 0.55 3.4 10YR 7/2

R‐89

Toe of Dune Dune not existent. No sample taken.

Berm SP 0.4 1.32 0 0.04 1 41.9 39.2 7.5YR 7/2

Mid‐Tide SP 0.67 0.58 0 0.16 1.14 65.9 7.5YR 7/3

‐3 SP 0.66 0.60 1.06 0.65 1.31 60.9 7.5YR 7/1

‐5 SP 0.17 2.56 0 1.43 0.58 5.9 10YR 7/1

‐10 SP 0.17 2.56 0.42 0.97 0.89 10.3 10.4 10YR 7/2

‐15 SP 0.17 2.56 0 2.41 0.92 11.8 10YR 7/2

‐20 SP 0.14 2.84 0.01 0.66 0.55 7.5 10YR 7/2

R‐93

Toe of Dune SP 0.59 0.76 0 0.03 0.84 71.8 7.5YR 7/2

Berm SP 0.64 0.64 0 0.14 0.95 76.5 64.5 7.5YR 7/3

Mid‐Tide SP 0.32 1.64 0 0.95 1.09 35.3 7.5YR 7/3

‐3 SP 0.21 2.25 0 3.98 0.83 11.3 10YR 7/1

‐5 SP 0.19 2.40 0 0.18 0.7 28.2 10YR 7/1

‐10 SP 0.15 2.74 0 1.79 0.68 6.8 8.4 10YR 7/1

‐15 SP 0.17 2.56 0.13 1.22 1 12.7 10YR 6/1

‐20 SP 0.15 2.74 0.2 1.59 0.65 4.8 10YR 6/1

Flagler Beach Composite

SP 0.28 1.85 0.08 0.93 0.83 23 25

Light to pinkish gray

*Retained in the #4 Sieve, **Passing the #230 Sieve

Appendix D, Geotechnical. Flagler County, Shore Protection Project Page 7 of 287

3 BORROW AREAS

3.1 SAND SEARCH INVESTIGATIONS

A number of potential borrow areas were identified in the USACE Reconnaissance Report from

2004. Potential borrow areas included the ebb shoal of Matanzas Inlet, the IWW, and three off‐ shore shoals. The IWW and Matanzas Inlet ebb shoal were ruled out early in the process because of their limited volumes and only the three off‐shore borrow areas (Area 1, Area 2, Area 3) were investigated via vibracoring. The Locations are depicted on the attached map

Plate B‐1. In addition to those offshore borrow areas, upland sand sources were also evaluated but were excluded from the study because they could not provide the quality and quantity of sand needed.

Florida Administrative Code 62B‐41.007(2) requires that beach fill meets the following requirements:

Carbonate or quartz with a particle size between 0.062 and 4.76mm

<5% silt passing the #230 sieve

<5% gravel sized shell retained on the #4 sieve

Fill material must be free of foreign matter, debris, toxic material

Fill material shall be similar in color and grainsize distribution

Halcrow Inc. investigated Area 1, which is part of the Farmton Sand Flat B geomorphologic unit, and is located approximately 2 Miles off‐shore of Flagler Beach. All results are presented in the

Report “Flagler Beach Shore Protection Project Feasibility Sand Search Report, March 2010 by

Halcrow, Inc.”

The investigation included sub bottom surveys and approximately 40 vibracores and grain size analysis on selected samples. Most vibracores show a 1 to 3‐ft thick beach‐compatible top sand layer. Only a few vibracores show a 3 to 5 ft thickness of beach compatible sand. However, sand thicknesses less than 5 feet are not considered dredgeable since state regulations require a 2‐ft buffer above the underlying non‐beach compatible layers. Therefore, Area 1 does not contain enough beach compatible material to be used as borrow area.

Area 2 and Area 3 were investigated by the USACE, Jacksonville district in 2011. Both areas are located in Federal Waters. Area 2 is part of the Korona Ridge Field geomorphologic unit and is located approximately six to seven miles off‐shore of Flagler Beach. Area 3 is part of the Flagler

Sand wave geomorphologic unit and is located approximately twelve to fourteen miles off‐ shore of Flagler Beach. Ten 20‐foot vibracores were drilled in Area 2 and thirteen 20‐foot vibracores were drilled in Area 3. The recovery of the vibracores is sometimes significantly less than 20 feet due to the underlying rock which could not be penetrated with the vibracore

Appendix D, Geotechnical. Flagler County, Shore Protection Project Page 8 of 287 apparatus. Laboratory testing was performed on selected sediment samples. Boring locations are shown on Plate B‐3. Boring logs and laboratory test results are attached in the appendix.

3.2 PROPOSED BORROW AREAS 2A, 2B, AND 2C

Thicknesses of the beach compatible sand layers vary from 5 to 18 feet in Area 2. Conservative values between 5 and 7 feet below seafloor surface were used as dredging depths for the volume estimates shown in Table 3. However, the indicated dredging depths may change with the availability of additional testing results. The estimates indicate that Area 2 contains approximately 5.5 million cubic yards (mcy) of beach compatible sand within three subareas:

Areas 2A, 2B, and 2C. Borrow areas 2A and 2B are located offshore Flagler County and are estimated to contain a combined volume of 3 mcy. Borrow area 2C is located off‐shore Volusia

County and is estimated to contain approximately 2.5 mcy of beach compatible sand. The borrow areas are depicted in Plate B‐3 and details are summarized in Table 3 below. Water depths are between ‐50 and ‐60 feet North Atlantic Vertical Datum (NAVD) 88 as shown on

Plate B‐4.

Table 3: Proposed Borrow Areas 2A, 2B, 2C

Sub‐ area

Size (ft)

Borrow Area Size

(acres)

Sand Thickness

Encountered (feet)

Sand Thickness used for Volume

Estimate (feet)

Volume Estimate (mcy)

Borings

2a 8,500 x 2,400 219 5 to 8 5 1.7

VC‐FSP11‐14,

VC‐FSP11‐16

2b 5,000 x 1,600 117 up to 18 7 1.3 VC‐FSP11‐15

2c 8,700 x 2,600 332 5 to 11 5 2.5 VC‐FSP11‐22, Four (4) 20‐foot vibracores (VC‐FSP11‐14 through VC‐FSP11‐16, and VC‐FSP11‐22) were collected in February 2011 within the proposed subareas 2A, 2B, and 2C as shown on Plate B‐3 and depicted in Figure 2.

3.2.1 Borrow Area 2A

An arithmetic composite sample was calculated using all samples within the borrow area 2A design depth. The composite sample indicates that the sediments are poorly‐graded, fine grained sands with a mean grain size that ranges from 0.19 mm (2.37 phi) to 0.37 mm (2.42 phi), with an average of 0.26 mm (1.98 phi). Visual shell values average 18%. The amount of fines passing the #230 sieve averages 1.80 %. The wet Munsell color of the sand is 10Y 5/1

(greenish gray) and the dry color is N 7/1 (light gray).

Appendix D, Geotechnical. Flagler County, Shore Protection Project Page 9 of 287

3.2.2 Borrow Area 2B

An arithmetic composite sample was calculated using all samples within the borrow area 2B design depth. The composite sample indicates that the sediments are poorly‐graded, fine grained sands with a mean grain size that ranges from 0.18 mm (2.51 phi) to 0.65 mm (0.62 phi), with an average of 0.30 mm (1.73 phi). Visual shell values average 23%. The amount of fines passing the #230 sieve averages 3.8 %. The wet Munsell color of the sand is 10Y 4/1 (dark greenish gray) and the dry color is N 7/1 (light gray).

3.2.3 Borrow Area 2C

An arithmetic composite sample was calculated using all samples within the borrow area 2C design depth. The composite sample indicates that the sediments are poorly‐graded, fine grained sands with a mean grain size that ranges from 0.17 mm (2.53 phi) to 0.20 mm (2.29 phi) with an average of 0.19 mm (2.39 phi). Visual shell values average 12%. The amount of fines passing the #230 sieve averages 1.9 %. The wet Munsell color of the sand is 5GY 5/1 (greenish gray) and the dry color is N 7/1 (light gray).

Figure 2. Borrow Area 2, 2011 Core Borings

Appendix D, Geotechnical. Flagler County, Shore Protection Project Page 10 of 287

3.2.4 Borrow Areas 2 Combined

An arithmetic composite sample for Area 2, including borrow area 2A, 2B, and 2C, was calculated using all samples within the borrow area design depths. The composite sample indicates that the sediments from borrow areas 2A, 2B, and 2C are poorly‐graded, fine grained sands with a mean grain size that ranges from 0.17mm (2.53 phi) to 0.65 mm (0.62 phi), with an average of 0.26 mm (1.98 phi). Visual shell values average 19% and carbonate content averages 15 %. The amount of fines passing the #230 sieve averages 2.89 %. The wet Munsell color of the sand is 5Y 5/1 (greenish gray) and the dry color is N 7/1 (light gray).

Table 4: Sediment Characteristics of Proposed Borrow Areas 2A, 2B, 2C

PointID Number USCS Mean (mm)

Mean (phi)

Gravel* (Shell)

Silt** Std.

Dev.

(phi)

Visual Shell %

Carbo‐ nate %

Munsell Color (wet)

VC‐FSP11‐14 1 SP 0.26 1.92 1.29 0.96 1.04 16 10Y 5/1

VC‐FSP11‐14 2 SP 0.26 1.95 1.15 1.36 1.12 18 10Y 5/1

VC‐FSP11‐14 3 SP 0.23 2.10 1 4.52 1.22 22 5GY 5/1

VC‐FSP11‐16 1 SP 0.19 2.37 0.19 1 0.63 8 5GY 6/1

VC‐FSP11‐16 2 SP 0.20 2.32 0.31 0.91 0.72 7 12 5GY 6/1

VC‐FSP11‐16 3 SP 0.37 1.42 6.27 2.02 1.74 37 10Y 5/1

Borrow Area 2A Composite 0.25 1.98 1.70 1.80 1.08 18 12 gray

VC‐FSP11‐15 1 SP 0.29 1.80 1.17 1.46 1.15 22 10Y 4/1

VC‐FSP11‐15 2 SP 0.18 2.51 0 2.74 0.57 10 10Y 4/1

VC‐FSP11‐15 3 SP‐SM 0.19 2.41 0 8.55 0.86 13 10Y 4/1

VC‐FSP11‐15 4 SP 0.65 0.62 13.16 3.08 2.13 49 5GY 4/1

VC‐FSP11‐15 5 SP 0.20 2.29 0.2 3.11 0.83 20 10Y 6/1

Borrow Area 2B Composite 0.30 1.73 2.91 3.79 1.11 23 n/a gray

VC‐FSP11‐22 1 SP 0.20 2.29 0.03 1.02 0.67 18 5GY 5/1

VC‐FSP11‐22 4 SP 0.18 2.46 0 2.36 0.51 5 5GY 5/1

VC‐FSP11‐22 7 SP 0.20 2.29 0 1.95 0.66 14 17 5GY 5/1

VC‐FSP11‐22 10 SP 0.17 2.53 0 2.47 0.56 9 5GY 5/1

Borrow Area 2C Composite 0.19 2.39 0.01 1.95 0.60 12 17 gray

Borrow Area 2 Combined Composite

0.26 1.98 1.65 2.50 0.96 18 15 gray

* Retained in the #4 Sieve, **Passing the #230 Sieve

Appendix D, Geotechnical. Flagler County, Shore Protection Project Page 11 of 287

3.3 PROPOSED BORROW AREA 3A

Beach compatible sand was identified throughout Area 3. However, since Area 3 is approximately 12,000 acres, only a selected portion (Area 3A) of the area is proposed as a borrow area for this project (Plate B‐3). Area 3A is approximately 2 Miles long and 1 Mile wide and has an estimated 20 mcy of beach‐compatible sand. The Thickness of the encountered beach compatible sand layer varies from 7 to 14 feet. A conservative value of 5 feet below seafloor surface was used as a dredging depth for the volume estimate as shown in Table 5.

However, the indicated dredging depth may change with the availability of additional testing results. Water depths are between ‐50 and ‐60 ft NAVD88, as shown on Plate B‐5.

Table 5: Proposed Borrow Area 3A

Sub‐ area

Size (ft) Borrow Area Size (acres)

Sand Thickness Encountered

(ft)

Sand Thickness used for Volume Estimate (feet)

Volume (mcy)

Borings

3A 13,000 x 8000 2300 7ft. to 14 5 20

VC‐FSP11‐3,

VC‐FSP11‐4,

VC‐FSP11‐5

VC‐FSP11‐6

Four (4) 20‐foot vibracores (VC‐FSP11‐3 through VC‐FSP11‐6) were collected in February 2011 within the proposed subarea 3A as shown on Plate B‐3 and depicted in Figure 3.

Figure 3: Borrow Area 3, 2011 Core Borings

Appendix D, Geotechnical. Flagler County, Shore Protection Project Page 12 of 287

Discrete samples were analyzed for grain‐size, visual shell and carbonate content. Laboratory testing results and granulometric statistics, calculated using the method of moments, are summarized in Table 6.

An arithmetic composite sample was calculated using all lab samples within the borrow area design depth. The composite sample indicates that the sediments from borrow area 3A are poorly‐graded, fine grained sands. The mean grain size ranges from 0.19 mm (2.40 phi) to 0.47 mm (1.09 phi), with an average of 0.29 mm (1.79 phi). Visual shell averages 16% and carbonate content averages 27%. The amount of fines passing the #230 sieve averages 1.7%. The wet

Munsell color of the sand is 10Y 5/1 (greenish gray) and the dry color is N 7/1 (light gray).

Table 6: Sediment Characteristics of Proposed Borrow Area 3A

PointID Number USCS Mean (mm)

Mean (phi)

Gravel* (Shell)

Silt ** Std.

Dev.

(phi)

Visual Shell

Carbo ‐nate

Munsell Color (wet)

VC‐FSP11‐3

1 SP 0.32 1.64 1.1 1.24 1.15 22 10Y 6/1

2 SP 0.25 2.00 0 0.9 0.79 14 10Y 6/1

3 SP 0.28 1.84 0.53 0.96 0.97 14 18 10Y 6/1

4 SP 0.21 2.25 0.33 2.11 0.76 7 10Y 6/1

5 SP 0.19 2.40 0 3.12 0.73 7 10Y 6/1

VC‐FSP11‐4

1 SP 0.38 1.40 0.45 1.08 1.08 27 10GY 5/1

2 SP 0.47 1.09 15.67 1.82 1.44 25 40 10GY 5/1

3 SP 0.23 2.12 1.84 1.44 1.01 7 10GY 5/1

VC‐FSP11‐5

1 SP 0.31 1.69 1.21 1.9 1.11 19 23 5GY 5/1

2 SP 0.27 1.89 0.16 0.66 0.91 17 5GY 5/1

3 SP 0.22 2.18 0 1.49 0.65 8 5GY 5/1

VC‐FSP11‐6

1 SP 0.31 1.69 0.43 0.54 0.92 14 5GY 5/1

2 SP 0.29 1.79 2.19 2.22 1.29 18 5GY 5/1

3 SP 0.3 1.74 0 1.21 1 24 26 5GY 5/1

Borrow Area3A Composite 0.29 1.84 1.7 1.5 1.0 15.9 26.8 gray

*Retained in the #4 Sieve, **Passing the #230 Sieve

Appendix D, Geotechnical. Flagler County, Shore Protection Project Page 13 of 287

4 COMPATIBILITY OF THE BORROW AREA WITH THE BEACHES

Grain size distribution, Overfill Factor and Renourishment Factor are used to determine if the proposed borrow areas are compatible with the Flagler beaches.

4.1 GRAIN SIZE DISTRIBUTION

Grain size analyses were performed on beach samples from Flagler County’s Beaches and on discrete samples of the proposed off‐shore borrow areas. Samples were analyzed for grain‐ size, visual shell and carbonate content. An arithmetic composite sample was calculated from the granulometric results. The composite sample results for the beach, borrow areas 2A, 2B, 2C, borrow areas 2 combined, and borrow area 3A are summarized in Table 7 and discussed below.

The native beach sediments of Flagler Beach consist of poorly‐graded, fine‐grained quartz sand with a mean grain size of 0.28 mm (1.85 phi), an average carbonate content of 25%, and an average silt content of 0.9 %. The material from the borrow area 2A, 2B, 2C consists of poorly‐ graded, fine‐grained quartz sand with a mean grain size of 0.25 mm for Area 2A, 0.30 mm for Area 2B, and 0.19 mm for Area 2C. The combined Area 2 average grainsize is 0.26mm (1.94 phi), the average carbonate content of 15%, and an average silt content of 2.89 %. The material from the borrow area 3A consists of poorly‐graded, fine‐grained quartz sand with a mean grain size of 0.29 mm (1.79 phi), an average carbonate content of 27%, and an average silt content of

1.48 %.

The testing results show that the material from borrow areas 2A, 2B, and 3A are very similar and compatible with the native beach and also meet the requirements of Florida state regulation. The material from borrow area 2C is very fine grained and would have to be mixed with coarser material to be compatible with Flagler County’s beaches.

Table 7: Sediment Analysis Summary

Composite Designation

USCS

Mean (mm)

Mean (phi)

Gravel* (Shell)

Silt ** Std.

Dev.

(phi)

Visual Shell

Carbo‐ nate %

Munsell Color

Borrow Area 2A SP 0.25 1.98 1.70 1.80 1.08 18 12 gray

Borrow Area 2B SP 0.30 1.73 2.91 3.79 1.11 23 n/a gray

Borrow Area 2C SP 0.19 2.39 0.01 1.95 0.60 12 17 gray

Borrow Area 2 Combined

SP 0.25 1.98 1.65 2.50 0.96 18 15 gray

Borrow Area3A SP 0.29 1.84 1.7 1.5 1.0 15.9 26.8 gray

*Retained in the #4 Sieve, ** Passing the #230 Sieve

Appendix D, Geotechnical. Flagler County, Shore Protection Project Page 14 of 287

4.2 OVERFILL AND RENOURISHMENT FACTOR

The Overfill and Renourishment Factors were devised to estimate the predicted performance of borrow materials with respect to the native beach materials, both during initial beach stabilization and over the long term. Thus, they help in choosing the best available borrow material. The factors also are used to calculate fill construction volume and renourishment volumes.

Overfill and Renourishment Factors are calculated using the sediment grainsize and standard deviation of the native beach and the borrow area.

The analysis results for Flagler beach are summarized in Table 8.

4.2.1 Overfill Factor

The Overfill Factor (RA) is primarily a volume factor which may be used to calculate an intentional overfill to compensate for volume loss during the initial construction. The RA is used to determine which alternative borrow material will provide the lowest placement volume and thus is most compatible with the existing beach. An overfill factor greater than 1.3 is considered unsuitable.

The RA for Flagler Beach was calculated using the USACE software program for each of the borrow areas. The RA for borrow area 2A = 1.21, area 2B = 1.10, area 2C = 14.62, and area 3A =

1.06. Therefore borrow areas 2A, 2B, and 3A are suitable for placement on Flagler County’s beaches. The RA for borrow area 2C is very high and characterizes the borrow material as unstable for Flagler County’s beaches.

4.2.2 Renourishment Factor

The Renourishment Factor (RJ) estimates long term relative erosion rates of borrow materials with respect to native materials. This is done by assuming all grains have a finite residence time in the local littoral system before being transported offshore or alongshore. Larger grains remain longer. The RJ is primarily a measure of relative long‐term stability. RJ values greater than one predict the borrow material will erode at a higher rate than the native beach.

Conversely, values of less than one predict the borrow material is more stable. A RJ greater than 1.1 is considered unsuitable

The RJ for Flagler Beach was calculated using the USACE software program for each of the borrow areas. The RJ for borrow area 2A = 0.83, area 2B = 0.58, area 2C = 2.43, and area 3A =

0.88. Therefore borrow areas 2A, 2B, and 3A are suitable for placement on Flagler County’s beaches. The RJ for borrow area 2C is very high and characterizes the borrow material as unstable for Flagler County’s beaches.

Appendix D, Geotechnical. Flagler County, Shore Protection Project Page 15 of 287

4.3 COMPATIBILITY SUMMARY

Grain size distribution, Overfill Factor and Renourishment Factor computations were used to determine if the proposed borrow areas 2A, 2B, 2C and 3A are compatible with the native beach. The compatibility analysis results for Flagler County’s beaches are summarized in Table

8.

The grain size analysis revealed that the sediments of the borrow areas are composed of fine‐ grained quartz sand with visual shell values between 12% and 23%. The beach is also composed of fine‐grained quartz sand with a visual shell value of 23%. The Overfill and

Renourishment Factors for Flagler beach were calculated for each of the borrow areas using the

USACE software program. Borrow areas 2A, 2B, and 3A showed Overfill Factors well below 1.3 and Renourishment Factors below 1.1 and are therefore suitable for Flagler County’s beaches.

The material from borrow area 2C is too fine and too poorly sorted to be compatible with

Flagler County’s beaches. However it could still be used if mixed with the sediments from the other proposed borrow areas. Also, additional investigation could reveal coarser material in borrow area 2C.

Table 8: Summary of Sediment Characteristics

Borrow Area 2 Borrow Area

3A Native BeachBorrow

Area 2A Borrow Area 2B

Borrow Area 2C

Borrow Area 2

Combined

Mean (mm) 0.25 0.30 0.19 0.26 0.29 0.28

Mean (phi) 1.98 1.73 2.39 1.94 1.79 1.85

Standard Deviation (phi) 1.08 1.11 0.60 1.01 0.99 0.83

Visual Shell % 18 23 12 19 16 23

Overfill Factors, RA 1.21 1.10 14.62 1.15 1.06 n/a

Renourishment Factor RJ 0.83 0.58 2.43 0.88 0.75 n/a

Appendix D, Geotechnical. Flagler County, Shore Protection Project Page 16 of 287

Appendix D, Geotechnical. Flagler County, Shore Protection Project Page 17 of 287

FLAGLER BEACH

t

A A-MONUMENT LOCATION

1G,GOO' I' 1UOG'

I I I I I I I

PLATE

B-1

*REFERENCED TO NAD83 FLORIDA EAST (US FEET)

AREA X* Y*

2A- A 650640.7 1873693.1 2A- 8 652939.8 1874392.5 2A- C 653142.6 1865468.5 2A- 0 655441.7 1866167.9 28- E 654050.4 1874616.2 28- F 655586.7 1875063.1 28- G 655454.1 1869790.6 28- H 656990.3 1870237.5 2C -I 656476.8 1854152.8 2C- J 659109.4 1854371.7 2C- K 657201.9 1845430.4 2C- L 659834.6 1845649.3 3A- M 666099.7 1903136.6 3A- N 671483.9 1909359.7 3A- 0 675967.1 1894599.4 3A- P 681351.3 1900822.5

AREA2A

8,000' 0' I . I • I

1,000'

I 18,000'

I

A R-MONUMENTS

US Army Corps oiEfllineern JolioiMIODOJil

GEOTECHNICAL DRAWINGS FLAGLER COUNTY 1-----------.........=.;;;;,;;,.--1 HURRICANE AND STORM DAMAGE REDUCTION

DEPARTMENT DF THE ARMY

JACKSONVILLE DISTRICT, CORPS OF ENGINEERS

JACKSONVILLE, FLORIDA

FEASABILITY STUDY

BORROW AREA MAP

B-2

* REFERENCED TO NAD83 FLORIDA EAST (US FEET)

BORING ID X* Y*

VC-FSP11-1 663001.4 1906821.7

VC-FSP11-2 666592.1 1911062.9

VC-FSP11-3 668362.4 1903690.2

VC-FSP11-4 673571.5 1906127.7

VC-FSP11-5 672890.5 1900724.4

VC-FSP11-6 678009.3 1898131.1

VC-FSP11-7 678828.5 1893077.6

VC-FSP11-8 684228.4 1895572.3

VC-FSP11-9 682406.7 1889244.6

VC-FSP11-10 687240.8 1890088.4

VC-FSP11-11 693287.6 1888856.5

VC-FSP11-12 691248.7 1884892.9

VC-FSP11-13 697757.9 1881942.8

VC-FSP11-14 652240.3 1872433.5

VC-FSP11-15 655510.1 1872704.4

VC-FSP11-16 653442.4 1868194.5

VC-FSP11-17 650133.8 1865964.5

VC-FSP11-18 653545.4 1864379.1

VC-FSP11-19 656769.9 1864382.5

VC-FSPll-20 656298 1860714.5 VC-FSPll-21 656922.4 1856128.2

VC-FSP11-22 657885.3 1850137.9

VC-FSP11-23 657898.5 1844675.5

FLAGLER

BEACH

R-MONUMENT X*

R081 616574.0

ROBS 617978.0

R089 619322.3 R093 620769.9

-23

AREA2

Y* 1868930.3 1865522.6 1862201.5 1858673.2

7,DDO' D'

I ' I I

7,DDO'

I

{!) BORING LOCATION

14,DDO'

I

A R-MONUMENT LOCATION

US Army Corps o!Efllineern JolioiMIODOJil

GEOTECHNICAL DRAWINGS FLAGLER COUNTY

1----------~~oo=,..;;;.;;.._--1 HURRICANE AND STORM DAMAGE REDUCTION

DEPARTMENT OF THE ARMY

JACKSONVILLE DISTRICT, CORPS OF ENGINEERS

JACKSONVILLE, FLORIDA

FEASABILITY STUDY

BORING LOCATION PLAN

B-3

Appendix D, Geotechnical. Flagler County, Shore Protection Project Page 20 of 287

AREA2A

GEOTECHNICAL DRAWINGS

US Army Corps DEPARTMENT OF THE ARMY o!Efllineern

JACKSONVILLE DISTRICT, CORPS OF ENGINEERS

JolioiMIODOJil JACKSONVILLE, FLORIDA

N

AREA2

2 500' 0' 2,500' 5,000' 'I I I I I I I I

NOTE: DEPTHS ARE IN REFERENCE TO NAVD88

sn y:

BUN PLATE

Dwn by: FLAGLER COUNTY

CJB

HURRICANE AND STORM DAMAGE REDUCTION y:

BUN FEASABILITY STUDY B-4

Dated:

NOV. 2012

Appendix D, Geotechnical. Flagler County, Shore Protection Project Page 21 of 287

AREA3

N

3 500' 0' 3,500' 7,000' 'I ' ' ' ' I I I

NOTE: DEPTHS ARE IN REFERENCE TO NAVD88

sn y:

BUN PLATE

GEOTECHNICAL DRAWINGS Dwn by: FLAGLER COUNTY

CJB

HURRICANE AND STORM DAMAGE REDUCTION y:US Army Corps DEPARTMENT OF THE ARMY BUN FEASABILITY STUDY B-5o!Efllineern JACKSONVILLE DISTRICT, CORPS OF ENGINEERS Dated:JolioiMIODOJil NOV. 2012 JACKSONVILLE, FLORIDA

APPENDIX

Appendix D, Geotechnical. Flagler County, Shore Protection Project Page 22 of 287

BORROW AREAS:

BORING LOGS AND LABORATORY TESTING RESULTS

Appendix D, Geotechnical. Flagler County, Shore Protection Project Page 23 of 287

Boring Designation VC-FSP11-1

-62.4

-64.9 -64.9

-67.9

-70.4

-72.4

-77.4

-62.4-62.4

-71.8

1-Post

NR

0.0

9.4

0.0

Vibracore

SAND, poorly-graded, mostly fine-grained sand-sized quartz, trace fine-grained sand-sized shell, weak reaction with HCl, moist, 10Y 5/1 greenish gray (SP)

From El. -64.5 to -64.9 Ft., few fine to medium-grained sand-sized shell

At El. -66.8 Ft., trace fine gravel-sized shell

From El. -67.4 to -68.4 Ft., mostly fine to medium-grained sand-sized quartz, little fine to medium-grained sand-sized shell

From El. -68.4 to -70.4 Ft., trace silt

From El. -70.4 to -71.8 Ft., few fine to medium-grained sand-sized shell, trace silt, strong reaction with HCl, 10Y 4/1 dark greenish gray At El. -71.4 Ft., trace fine to coarse gravel-sized shell SAND, poorly-graded with silt, mostly fine-grained sand-sized quartz, few fine to medium-grained sand-sized shell, few silt, strong reaction with HCl, moist, 10Y 4/1 dark greenish gray (SP-SM)

From El. -76.1 to -78.9 Ft., few fine to medium-grained sand-sized shell, trace silt nodules

DEPTH

RQD

OR

UD

B

LO

W S

FT

N -V A

LU

E

REMARKSCLASSIFICATION OF MATERIALS %

REC.

LE

G E N D

ELEV.

B O X O R

S A M P

LE

2. BORING DESIGNATION

STARTED

3. DRILLING AGENCY

13. TOTAL NUMBER CORE BOXES

DIVISION INSTALLATION

VERTICAL

12. TOTAL SAMPLES

9. SIZE AND TYPE OF BIT

6. THICKNESS OF OVERBURDEN

VC-FSP11-1

4. NAME OF DRILLER

AUTO HAMMERLOCATION COORDINATES

17. TOTAL RECOVERY FOR BORING

10. COORDINATE SYSTEM/DATUM

MANUAL HAMMER

DRILLING LOG

VERTICAL

OF 2

UNDISTURBED (UD)

16. ELEVATION TOP OF BORING

BEARING

8. TOTAL DEPTH OF BORING

SHEETS

5. DIRECTION OF BORING

DISTURBED

DEG. FROM

VERTICAL

SHEET

14. ELEVATION GROUND WATER

HORIZONTAL

1. PROJECT

INCLINED

CONTRACTOR FILE NO.

11. MANUFACTURER'S DESIGNATION OF DRILL

COMPLETED

18. SIGNATURE AND TITLE OF INSPECTOR

15. DATE BORING

7. DEPTH DRILLED INTO ROCK

(Continued)

NAVD88

Karishma R. Desai, P.E., Geotechnical Engineer

South Atlantic

N/A

6734-11-9583

Brian McCord

Off-Shore Borrow Area Investigations

Flagler County, Florida

02-14-11

-62.4 Ft.

90 %

NAD83

See Remarks

State Plane, FLE (U.S. Ft.)

X = 663,001 Y = 1,906,822

AVS

20.0 Ft.

Jacksonville District

02-14-11

N/A

JUN 02

SAJ FORM 1836

Appendix D, Geotechnical. Flagler County, Shore Protection Project Page 24 of 287

Boring Designation VC-FSP11-1

-82.4

-82.4 20.0

Abbreviations:

NR = Not Recorded.

From El. -78.9 to -80.1 Ft., little fine to coarse-grained sand-sized shell, occasional trace fine-grained sand-sized shell

From El. -80.1 to -80.4 Ft., little fine to medium-grained sand-sized shell

NOTES:

1. USACE Jacksonville is the custodian for these original files.

2. Soils are field visually classified in accordance with the Unified Soils Classification System.

3. 100% recovery attained from 0.0 to 18 feet. Due to varying quantities and size of shell, recovery of sample from 18.0 to 20.0 feet was not achieved. Soil description based on material retained in the shoe.

4. Laboratory Testing Results

SAMPLE SAMPLE LABORATORY

ID DEPTH CLASSIFICATION

1 2.5/3.0 SP*

1-Post 2.5/3.0 SP*

2 5.5/6.0 SP*

3 8.0/8.5 SP*

4 10.0/10.5 SP-SM*

5 15.0/15.5 SP-SM*

*Lab visual classification based on gradation curve. No Atterberg limits.

DEPTH

RQD

OR

UD

B

LO

W S

FT

N -V A

LU

E

REMARKS CLASSIFICATION OF MATERIALS %

REC.

LE

G E N D

ELEV.

B O X O R

S A M

ELEVATION TOP OF BORING

Off-Shore Borrow Area Investigations NAD83

DRILLING LOG (Cont. Sheet)

NAVD88

-62.4 Ft.

State Plane, FLE (U.S. Ft.)

Jacksonville District

VERTICAL

SHEETS

SHEET

X = 663,001 Y = 1,906,822

COORDINATE SYSTEM/DATUM PROJECT HORIZONTAL

OF 2

INSTALLATION

LOCATION COORDINATES

JUN 02

SAJ FORM 1836-A

Appendix D, Geotechnical. Flagler County, Shore Protection Project Page 25 of 287

Boring Designation VC-FSP11-2

-62.8

-63.8

-66.3

-62.8-62.8

-64.6

-68.3

-75.6

-77.8

NR

0.0

1.8

5.5

12.8

15.0

0.0

Vibracore SAND, poorly-graded, mostly fine to medium-grained sand-sized quartz, some fine to coarse-grained sand-sized shell, weak reaction with HCl, moist, 10Y 7/1 light greenish gray (SP) At El. -64.3 Ft., trace fine gravel-sized shell SAND, poorly-graded with silt, mostly fine-grained sand-sized quartz, few silt, few fine to medium-grained sand-sized shell, strong reaction with HCl, moist, 5GY 5/1 greenish gray (SP-SM)

At El. -67.0 Ft., trace silt nodule

CLAY, fat, little fine-grained sand-sized quartz, few silt, trace fine-grained sand-sized shell, trace organic matter, weak reaction with HCl, moist, 10Y 2.5/1 greenish black

(CH)

At El. -68.8 Ft., 1/2" thick sand seam From El. -70.0 to -82.8 Ft., 10Y 4/1 dark greenish gray

From El. -71.8 to -73.8 Ft., occasional thin sand layers (approximately 1/16" thick)

From El. -72.8 to -75.6 Ft., trace fine-grained sand-sized quartz, discontinue fine-grained sand-sized shell

SAND, clayey, mostly fine-grained sand-sized quartz, some clay, little fine to coarse-grained sand-sized shell, few silt, weak reaction with HCl, moist, 5GY 4/1 dark greenish gray (SC)

From El. -77.3 to -77.8 Ft., little silt, trace

DEPTH

RQD

OR

UD

B

LO

W S

FT

N -V A

LU

E

REMARKSCLASSIFICATION OF MATERIALS %

REC.

LE

G E N D

ELEV.

B O X O R

S A M

3. DRILLING AGENCY

13. TOTAL NUMBER CORE BOXES

DIVISION INSTALLATION

VERTICAL

12. TOTAL SAMPLES

9. SIZE AND TYPE OF BIT

6. THICKNESS OF OVERBURDEN

VC-FSP11-2

4. NAME OF DRILLER

AUTO HAMMERLOCATION COORDINATES

17. TOTAL RECOVERY FOR BORING

10. COORDINATE SYSTEM/DATUM

MANUAL HAMMER

DRILLING LOG

VERTICAL

OF 2

UNDISTURBED (UD)

16. ELEVATION TOP OF BORING

BEARING

8. TOTAL DEPTH OF BORING

SHEETS

5. DIRECTION OF BORING

DISTURBED

DEG. FROM

VERTICAL

SHEET

14. ELEVATION GROUND WATER

HORIZONTAL

1. PROJECT

INCLINED

CONTRACTOR FILE NO.

11. MANUFACTURER'S DESIGNATION OF DRILL

COMPLETED

18. SIGNATURE AND TITLE OF INSPECTOR

15. DATE BORING

7. DEPTH DRILLED INTO ROCK

(Continued)

NAVD88

Karishma R. Desai, P.E., Geotechnical Engineer

South Atlantic

N/A

6734-11-9583

Brian McCord

Off-Shore Borrow Area Investigations

Flagler County, Florida

02-14-11

-62.8 Ft.

100 %

NAD83

See Remarks

State Plane, FLE (U.S. Ft.)

X = 666,592 Y = 1,911,063

AVS

20.0 Ft.

Jacksonville District

02-14-11

N/A

JUN 02

SAJ FORM 1836

Appendix D, Geotechnical. Flagler County, Shore Protection Project Page 26 of 287

Boring Designation VC-FSP11-2

-82.8 -82.8 20.0

Abbreviations:

NR = Not Recorded.

fine-grained sand-sized shell CLAY, fat, little silt, trace fine-grained sand-sized quartz, trace fine-grained sand-sized shell, weak reaction with HCl, moist, 5GY 4/1 dark greenish gray (CH)

From El. -79.9 to -80.4 Ft., few fine-grained sand-sized quartz, few fine to coarse-grained sand-sized shell

From El. -81.2 to -82.8 Ft., occasional sand layers (approximately 1/16" thick)

NOTES:

1. USACE Jacksonville is the custodian for these original files.

2. Soils are field visually classified in accordance with the Unified Soils Classification System.

3. Laboratory Testing Results

SAMPLE SAMPLE LABORATORY

ID DEPTH CLASSIFICATION

1 1.0/1.5 SP*

2 3.5/4.0 SP-SM*

*Lab visual classification based on gradation curve. No Atterberg limits.

DEPTH

RQD

OR

UD

B

LO

W S

FT

N -V A

LU

E

REMARKS CLASSIFICATION OF MATERIALS %

REC.

LE

G E N D

ELEV.

B O X O R

S A M

DRILLING LOG (Cont. Sheet)

NAVD88

-62.8 Ft.

State Plane, FLE (U.S. Ft.)

Jacksonville District

VERTICAL

SHEETS

SHEET

X = 666,592 Y = 1,911,063

COORDINATE SYSTEM/DATUM PROJECT HORIZONTAL

OF 2

INSTALLATION

LOCATION COORDINATES

SAJ FORM 1836-A

JUN 02

Appendix D, Geotechnical. Flagler County, Shore Protection Project Page 27 of 287

Boring Designation VC-FSP11-3

-71.3

-56.8

-57.8

-60.8

-63.8 -63.8

-66.8

-69.8

-56.8-56.8

3-Post

NR

-71.314.5

0.00.0

Abbreviations:

Vibracore SAND, poorly-graded, mostly fine to medium-grained sand-sized quartz, little fine to medium-grained sand-sized shell, trace silt, weak reaction with HCl, moist, 10Y 6/1 greenish gray (SP)

From El. -59.8 to -71.3 Ft., mostly fine-grained sand-sized quartz

From El. -62.5 to -66.3 Ft., little medium-grained sand-sized shell At El. -62.8 Ft., trace coarse gravel-sized shell, (up to 2.5" long and 1-3/4" wide)

From El. -66.3 to -71.3 Ft., few fine to medium-grained sand-sized shell, trace fine gravel-sized shell

BORING TERMINATED IN REFUSAL

DEPTH

RQD

OR

UD

B

LO

W S

FT

N -V A

LU

E

REMARKSCLASSIFICATION OF MATERIALS %

REC.

LE

G E N D

ELEV.

B O X O R

S A M

3. DRILLING AGENCY

13. TOTAL NUMBER CORE BOXES

DIVISION INSTALLATION

VERTICAL

12. TOTAL SAMPLES

9. SIZE AND TYPE OF BIT

6. THICKNESS OF OVERBURDEN

VC-FSP11-3

4. NAME OF DRILLER

AUTO HAMMERLOCATION COORDINATES

17. TOTAL RECOVERY FOR BORING

10. COORDINATE SYSTEM/DATUM

MANUAL HAMMER

DRILLING LOG

VERTICAL

OF 2

UNDISTURBED (UD)

16. ELEVATION TOP OF BORING

BEARING

8. TOTAL DEPTH OF BORING

SHEETS

5. DIRECTION OF BORING

DISTURBED

DEG. FROM

VERTICAL

SHEET

14. ELEVATION GROUND WATER

HORIZONTAL

1. PROJECT

INCLINED

CONTRACTOR FILE NO.

11. MANUFACTURER'S DESIGNATION OF DRILL

COMPLETED

18. SIGNATURE AND TITLE OF INSPECTOR

15. DATE BORING

7. DEPTH DRILLED INTO ROCK

(Continued)

NAVD88

Karishma R. Desai, P.E., Geotechnical Engineer

South Atlantic

N/A

6734-11-9583

Brian McCord

Off-Shore Borrow Area Investigations

Flagler County, Florida

02-14-11

-56.8 Ft.

98 %

NAD83

See Remarks

State Plane, FLE (U.S. Ft.)

X = 668,362 Y = 1,903,690

AVS

14.5 Ft.

Jacksonville District

02-14-11

N/A

JUN 02

SAJ FORM 1836

Appendix D, Geotechnical. Flagler County, Shore Protection Project Page 28 of 287

Boring Designation VC-FSP11-3

DEPTH

RQD

OR

UD

B

LO

W S

FT

N -V A

LU

E

REMARKS CLASSIFICATION OF MATERIALS %

REC.

LE

G E N D

ELEV.

B O X O R

S A M

DRILLING LOG (Cont. Sheet)

NAVD88

-56.8 Ft.

State Plane, FLE (U.S. Ft.)

Jacksonville District

VERTICAL

SHEETS

SHEET

X = 668,362 Y = 1,903,690

COORDINATE SYSTEM/DATUM PROJECT HORIZONTAL

OF 2

INSTALLATION

LOCATION COORDINATES

NOTES:

1. USACE Jacksonville is the custodian for these original files.

2. Soils are field visually classified in accordance with the Unified Soils Classification System.

3. Vibracore penetrated to 14.5 feet.

Sample recovery from 13.7 to 14.5 feet was not attained. Soil description based on material retained in the shoe.

4. Laboratory Testing Results

SAMPLE SAMPLE LABORATORY

ID DEPTH CLASSIFICATION

1 1.0/1.5 SP*

2 4.0/4.5 SP*

3 7.0/7.5 SP*

3-Post 7.0/7.5 SP*

4 10.0/10.5 SP*

5 13.0/13.5 SP*

*Lab visual classification based on gradation curve. No Atterberg limits.

NR = Not Recorded.

SAJ FORM 1836-A

Appendix D, Geotechnical. Flagler County, Shore Protection Project Page 29 of 287

Boring Designation VC-FSP11-4

-69.1

-60.0

-61.0

-64.0 -64.0

-67.0

-60.0-60.0

2-Post

NR

-69.19.1

0.00.0

Abbreviations:

NR = Not Recorded.

Vibracore SAND, poorly-graded, mostly fine to medium-grained sand-sized quartz, little fine to medium-grained sand-sized shell, weak reaction with HCl, moist, 10GY 5/1 greenish gray (SP) From El. -61.5 to -62.3 Ft., trace fine to medium-grained sand-sized shell

From El. -62.3 to -69.1 Ft., mostly fine-grained sand-sized quartz, little medium to coarse-grained sand-sized shell, trace silt

At El. -63.6 Ft., little fine to coarse gravel-sized shell

BORING TERMINATED IN REFUSAL

NOTES:

1. USACE Jacksonville is the custodian for these original files.

2. Soils are field visually classified in accordance with the Unified Soils Classification System.

3. Vibracore penetrated to 9.1 feet. Sample recovery from 7.3 to 9.1 feet was not attained. Soil description based on material retained in the shoe.

4. Laboratory Testing Results

SAMPLE SAMPLE LABORATORY

DEPTH

RQD

OR

UD

B

LO

W S

FT

N -V A

LU

E

REMARKSCLASSIFICATION OF MATERIALS %

REC.

LE

G E N D

ELEV.

B O X O R

S A M

3. DRILLING AGENCY

13. TOTAL NUMBER CORE BOXES

DIVISION INSTALLATION

VERTICAL

12. TOTAL SAMPLES

9. SIZE AND TYPE OF BIT

6. THICKNESS OF OVERBURDEN

VC-FSP11-4

4. NAME OF DRILLER

AUTO HAMMERLOCATION COORDINATES

17. TOTAL RECOVERY FOR BORING

10. COORDINATE SYSTEM/DATUM

MANUAL HAMMER

DRILLING LOG

VERTICAL

OF 2

UNDISTURBED (UD)

16. ELEVATION TOP OF BORING

BEARING

8. TOTAL DEPTH OF BORING

SHEETS

5. DIRECTION OF BORING

DISTURBED

DEG. FROM

VERTICAL

SHEET

14. ELEVATION GROUND WATER

HORIZONTAL

1. PROJECT

INCLINED

CONTRACTOR FILE NO.

11. MANUFACTURER'S DESIGNATION OF DRILL

COMPLETED

18. SIGNATURE AND TITLE OF INSPECTOR

15. DATE BORING

7. DEPTH DRILLED INTO ROCK

(Continued)

NAVD88

Karishma R. Desai, P.E., Geotechnical Engineer

South Atlantic

N/A

6734-11-9583

Brian McCord

Off-Shore Borrow Area Investigations

Flagler County, Florida

02-14-11

-60.0 Ft.

86 %

NAD83

See Remarks

State Plane, FLE (U.S. Ft.)

X = 673,572 Y = 1,906,128

AVS

9.1 Ft.

Jacksonville District

02-14-11

N/A

JUN 02

SAJ FORM 1836

Appendix D, Geotechnical. Flagler County, Shore Protection Project Page 30 of 287

Boring Designation VC-FSP11-4

DEPTH

RQD

OR

UD

B

LO

W S

FT

N -V A

LU

E

REMARKS CLASSIFICATION OF MATERIALS %

REC.

LE

G E N D

ELEV.

B O X O R

S A M

DRILLING LOG (Cont. Sheet)

NAVD88

-60.0 Ft.

State Plane, FLE (U.S. Ft.)

Jacksonville District

VERTICAL

SHEETS

SHEET

X = 673,572 Y = 1,906,128

COORDINATE SYSTEM/DATUM PROJECT HORIZONTAL

OF 2

INSTALLATION

LOCATION COORDINATES

ID DEPTH CLASSIFICATION

1 1.0/1.5 SP*

2-Post 4.0/4.5 SP*

SAJ FORM 1836-A

JUN 02

Appendix D, Geotechnical. Flagler County, Shore Protection Project Page 31 of 287

Boring Designation VC-FSP11-5

-67.4

-59.7

-60.7 -60.7

-63.7

-66.2

-59.7-59.7

1-Post

NR

-67.47.7

0.00.0

Abbreviations:

NR = Not Recorded.

Vibracore SAND, poorly-graded, mostly fine-grained sand-sized quartz, little fine to medium-grained sand-sized shell, trace silt, weak reaction with HCl, moist, 5GY 5/1 greenish gray (SP)

At El. -64.2 Ft., trace fine gravel-sized coral

From El. -65.2 to -67.4 Ft., few medium-grained sand-sized shell, trace fine gravel-sized shell, strong reaction with HCl

BORING TERMINATED IN REFUSAL

NOTES:

1. USACE Jacksonville is the custodian for these original files.

2. Soils are field visually classified in accordance with the Unified Soils Classification System.

3. Vibracore penetrated to 7.7 feet. Sample recovery from 6.7 to 7.7 feet was not attained. Soil description based on material retained in the shoe.

4. Laboratory Testing Results

SAMPLE SAMPLE LABORATORY

ID DEPTH CLASSIFICATION

1 1.0/1.5 SP*

1-Post 1.0/1.5 SP*

2 4.0/4.5 SP*

DEPTH

RQD

OR

UD

B

LO

W S

FT

N -V A

LU

E

REMARKSCLASSIFICATION OF MATERIALS %

REC.

LE

G E N D

ELEV.

B O X O R

S A M

3. DRILLING AGENCY

13. TOTAL NUMBER CORE BOXES

DIVISION INSTALLATION

VERTICAL

12. TOTAL SAMPLES

9. SIZE AND TYPE OF BIT

6. THICKNESS OF OVERBURDEN

VC-FSP11-5

4. NAME OF DRILLER

AUTO HAMMERLOCATION COORDINATES

17. TOTAL RECOVERY FOR BORING

10. COORDINATE SYSTEM/DATUM

MANUAL HAMMER

DRILLING LOG

VERTICAL

OF 2

UNDISTURBED (UD)

16. ELEVATION TOP OF BORING

BEARING

8. TOTAL DEPTH OF BORING

SHEETS

5. DIRECTION OF BORING

DISTURBED

DEG. FROM

VERTICAL

SHEET

14. ELEVATION GROUND WATER

HORIZONTAL

1. PROJECT

INCLINED

CONTRACTOR FILE NO.

11. MANUFACTURER'S DESIGNATION OF DRILL

COMPLETED

18. SIGNATURE AND TITLE OF INSPECTOR

15. DATE BORING

7. DEPTH DRILLED INTO ROCK

(Continued)

NAVD88

Karishma R. Desai, P.E., Geotechnical Engineer

South Atlantic

N/A

6734-11-9583

Brian McCord

Off-Shore Borrow Area Investigations

Flagler County, Florida

02-14-11

-59.7 Ft.

88 %

NAD83

See Remarks

State Plane, FLE (U.S. Ft.)

X = 672,891 Y = 1,900,724

AVS

7.7 Ft.

Jacksonville District

02-14-11

N/A

JUN 02

SAJ FORM 1836

Appendix D, Geotechnical. Flagler County, Shore Protection Project Page 32 of 287

Boring Designation VC-FSP11-5

3 6.5/6.7 SP*

*Lab visual classification based on gradation curve. No Atterberg limits.

DEPTH

RQD

OR

UD

B

LO

W S

FT

N -V A

LU

E

REMARKS CLASSIFICATION OF MATERIALS %

REC.

LE

G E N D

ELEV.

B O X O R

S A M

DRILLING LOG (Cont. Sheet)

NAVD88

-59.7 Ft.

State Plane, FLE (U.S. Ft.)

Jacksonville District

VERTICAL

SHEETS

SHEET

X = 672,891 Y = 1,900,724

COORDINATE SYSTEM/DATUM PROJECT HORIZONTAL

OF 2

INSTALLATION

LOCATION COORDINATES

SAJ FORM 1836-A

JUN 02

Appendix D, Geotechnical. Flagler County, Shore Protection Project Page 33 of 287

Boring Designation VC-FSP11-6

-70.1

-61.7

-62.7

-65.7

-68.5 -68.5

-61.7-61.7

3-Post

NR

-70.18.4

0.00.0

Abbreviations:

NR = Not Recorded.

Vibracore SAND, poorly-graded, mostly fine-grained sand-sized quartz, little medium-grained sand-sized shell, trace silt, weak reaction with HCl, moist, 5GY 5/1 greenish gray (SP)

At El. -63.4 Ft., trace fine gravel-sized shell From El. -63.5 to -64.4 Ft., trace fine-grained sand-sized shell

From El. -65.0 to -66.6 Ft., little medium to coarse-grained sand-sized shell

From El. -67.4 to -68.1 Ft., trace fine gravel-sized shell

From El. -68.1 to -70.1 Ft., little medium-grained sand-sized shell

BORING TERMINATED IN REFUSAL

NOTES:

1. USACE Jacksonville is the custodian for these original files.

2. Soils are field visually classified in accordance with the Unified Soils Classification System.

3. Vibracore penetrated to 8.4 feet. Sample recovery from 6.9 to 8.4 feet was not attained. Soil description based on material retained in the shoe.

4. Laboratory Testing Results

SAMPLE SAMPLE LABORATORY

ID DEPTH CLASSIFICATION

1 1.0/1.5 SP*

DEPTH

RQD

OR

UD

B

LO

W S

FT

N -V A

LU

E

REMARKSCLASSIFICATION OF MATERIALS %

REC.

LE

G E N D

ELEV.

B O X O R

S A M

3. DRILLING AGENCY

13. TOTAL NUMBER CORE BOXES

DIVISION INSTALLATION

VERTICAL

12. TOTAL SAMPLES

9. SIZE AND TYPE OF BIT

6. THICKNESS OF OVERBURDEN

VC-FSP11-6

4. NAME OF DRILLER

AUTO HAMMERLOCATION COORDINATES

17. TOTAL RECOVERY FOR BORING

10. COORDINATE SYSTEM/DATUM

MANUAL HAMMER

DRILLING LOG

VERTICAL

OF 2

UNDISTURBED (UD)

16. ELEVATION TOP OF BORING

BEARING

8. TOTAL DEPTH OF BORING

SHEETS

5. DIRECTION OF BORING

DISTURBED

DEG. FROM

VERTICAL

SHEET

14. ELEVATION GROUND WATER

HORIZONTAL

1. PROJECT

INCLINED

CONTRACTOR FILE NO.

11. MANUFACTURER'S DESIGNATION OF DRILL

COMPLETED

18. SIGNATURE AND TITLE OF INSPECTOR

15. DATE BORING

7. DEPTH DRILLED INTO ROCK

(Continued)

NAVD88

Karishma R. Desai, P.E., Geotechnical Engineer

South Atlantic

N/A

6734-11-9583

Brian McCord

Off-Shore Borrow Area Investigations

Flagler County, Florida

02-14-11

-61.7 Ft.

86 %

NAD83

See Remarks

State Plane, FLE (U.S. Ft.)

X = 678,009 Y = 1,898,131

AVS

8.4 Ft.

Jacksonville District

02-14-11

N/A

JUN 02

SAJ FORM 1836

Appendix D, Geotechnical. Flagler County, Shore Protection Project Page 34 of 287

Boring Designation VC-FSP11-6

2 4.0/4.5 SP*

3 6.8/6.9 SP*

3-Post 6.8/6.9 SP*

*Lab visual classification based on gradation curve. No Atterberg limits.

DEPTH

RQD

OR

UD

B

LO

W S

FT

N -V A

LU

E

REMARKS CLASSIFICATION OF MATERIALS %

REC.

LE

G E N D

ELEV.

B O X O R

S A M

DRILLING LOG (Cont. Sheet)

NAVD88

-61.7 Ft.

State Plane, FLE (U.S. Ft.)

Jacksonville District

VERTICAL

SHEETS

SHEET

X = 678,009 Y = 1,898,131

COORDINATE SYSTEM/DATUM PROJECT HORIZONTAL

OF 2

INSTALLATION

LOCATION COORDINATES

SAJ FORM 1836-A

JUN 02

Appendix D, Geotechnical. Flagler County, Shore Protection Project Page 35 of 287

Boring Designation VC-FSP11-7

SAJ FORM 1836

JUN 02

-63.2

-54.6

-55.6

-58.6 -58.6

-61.6

-54.6-54.6

2-Post

NR

-63.28.6

0.00.0

Abbreviations:

NR = Not Recorded.

Vibracore SAND, poorly-graded, mostly fine-grained sand-sized quartz, little fine to medium-grained sand-sized shell, trace silt, weak reaction with HCl, moist, 10Y 5/1 greenish gray (SP)

From El. -57.4 to -58.3 Ft., few fine to medium-grained sand-sized shell

From El. -60.6 to -63.2 Ft., few medium-grained sand-sized shell

BORING TERMINATED IN REFUSAL

NOTES:

1. USACE Jacksonville is the custodian for these original files.

2. Soils are field visually classified in accordance with the Unified Soils Classification System.

3. Vibracore penetrated to 8.6 feet. Sample recovery from 7.8 to 8.6 feet was not attained. Soil description based on material retained in the shoe.

4. Laboratory Testing Results

SAMPLE SAMPLE LABORATORY

ID DEPTH CLASSIFICATION

DEPTH

RQD

OR

UD

B

LO

W S

FT

N -V A

LU

E

REMARKSCLASSIFICATION OF MATERIALS %

REC.

LE

G E N D

ELEV.

B O X O R

S A M

3. DRILLING AGENCY

13. TOTAL NUMBER CORE BOXES

DIVISION INSTALLATION

VERTICAL

12. TOTAL SAMPLES

9. SIZE AND TYPE OF BIT

6. THICKNESS OF OVERBURDEN

VC-FSP11-7

4. NAME OF DRILLER

AUTO HAMMERLOCATION COORDINATES

17.