2026-15 Flood Protection Project - WPCF_Part2.pdf

Photographic Log

Client Name: Town of Stratford Site Location: Stratford WPCF

105 Beacon Point Road Stratford, Connecticut

Project No.

18.0172256.70

Photo No.

Date:

4/5/22

Direction Photo Taken:

East

Description:

TP-1

Test pit excavation into embankment of Beacon Point Road Levee.

Beacon Point Road is located opposite the chain link fence.

Photo No.

Date:

4/5/22

Direction Photo Taken:

East

Description:

TP-1 spoils piles, stone boulders visible in pile.

Site Location: Stratford WPCF

105 Beacon Point Road Stratford, Connecticut

Project No.

18.0172256.70

Photo No.

West

Description:

TP-2

Excavation, note Armor Stone with spoils in background and in excavation sidewall.

Date:

4/5/22

Direction Photo Taken:

Northwest

Description:

TP-2 Spoils pile, with Armor Stones.

Site Location: Stratford WPCF

105 Beacon Point Road Stratford, Connecticut

Project No.

18.0172256.70

Photo No.

4/4/22

South

Description:

TP-3

Excavation in at Beacon Point Road Dike with armor stone on top.

Upper armor stone was excavated with test pit.

In place armor stone is below with topsoil mix in joints.

Date:

4/4/22

Direction Photo Taken:

Southeast

Description:

TP-3

Sidewall of excavation with end of armor stone at landside crest (inside of WPCF site).

Site Location: Stratford WPCF

105 Beacon Point Road Stratford, Connecticut

Project No.

18.0172256.70

Photo No.

Date:

4/4/22

Direction Photo Taken:

South

Description:

TP-3 spoil piles.

Date:

4/4/22

Direction Photo Taken:

South

TP-3 Additional spoil pile.

Site Location: Stratford WPCF

105 Beacon Point Road Stratford, Connecticut

Project No.

18.0172256.70

Photo No.

Date:

4/4/22

Direction Photo Taken:

South

Description:

TP-4

Excavation in face of embankment and toe at Beacon Point Road Dike.

Date:

4/4/22

Direction Photo Taken:

West

Description:

TP-4

Excavation from landside of toe of Beacon Point Road Dike. Underdrain was not encountered.

Site Location: Stratford WPCF

105 Beacon Point Road Stratford, Connecticut

Project No.

18.0172256.70

Photo No.

4/4/22

Northeast

TP-4 Spoils pile

Description:

TP-5

Excavation of test pit and armor stone.

Site Location: Stratford WPCF

105 Beacon Point Road Stratford, Connecticut

Project No.

18.0172256.70

Photo No.

South

Description:

TP-5 spoils pile with stone.

4/7/21

Description:

TP-6

Excavation of TP-6, undisturbed armor stone on top left of photo.

Site Location: Stratford WPCF

105 Beacon Point Road Stratford, Connecticut

Project No.

18.0172256.70

Photo No.

Date:

4/7/21

Direction Photo Taken:

West

Description:

TP-6

Armor Stone temporarily moved for test pit.

4/7/21

TP-5 spoils pile.

Appendix D – Rock Core Photographs

Appendix D

STRATFORD WATER POLLUTION CONTROL FACILITY PERIMETER FLOOD WALL IMPROVEMENTS

STRATFORD, CONNECTICUT

Rock Core Photographs

Notes: 1. Box row corresponds to the core box section in which the rock core sample is contained; Row 1 = Top.

2. Top photo is dry; bottom photo is wetted.

3. Rock core sample starts on left side of photo.

Boring No. Run Depth (ft) Recovery (in) Recovery (%) RQD (in) RQD (%) Rock Type Box Row

GZ-5 C-1 29.6 - 34.6 57 95 51 85 GNEISS 1

Appendix E – Previous Explorations by Others

Appendix F – Geotechnical Laboratory Analysis

One-Dimensional Consolidation by ASTM D2435 - Method A

2022-05-27 13:25:32 2.3.16.137 / 2.3.16.137 1

Project: Stratford Water Pollution

Boring No.: GZ-1

Sample No.: ST-1 (Tube)

Test No.: IP-1R

Description: Wet, very dark gray silt

Remarks: TX-005, Swell Pressure = 0.0696 tsf

Location: Stratford, CT

Tested By: trm

Test Date: 5/13/22

Sample Type: intact

Project No.: GTX-315388

Checked By: anm

Depth: 17-19 ft bg

Elevation: ---

Displacement at End of Increment

Summary Report

0.01 0.1 1 10 100

Vertical Stress, tsf

S tr ai n,

0.01 0.1 1 10 100

Vertical Stress, tsf

-9

-8

-7

-6

-5

-4

-3

-2

C v, ft ²/ s

2022-05-27 13:25:33 2.3.16.137 / 2.3.16.137 2

Project: Stratford Water Pollution

Boring No.: GZ-1

Sample No.: ST-1 (Tube)

Test No.: IP-1R

Description: Wet, very dark gray silt

Remarks: TX-005, Swell Pressure = 0.0696 tsf

Location: Stratford, CT

Tested By: trm

Test Date: 5/13/22

Sample Type: intact

Project No.: GTX-315388

Checked By: anm

Depth: 17-19 ft bg

Elevation: ---

Time Curve 1 of 13

Constant Volume Step

Stress: 0.0696 tsf

0.01 0.1 1 10 100 1000 10000

Time, min

0.0

0.2

0.4

0.6

0.8

1.0

1.2

S tr es s, ts f

0 10 20 30 40 50 60

Square Root of Time, √min

0.0

0.2

0.4

0.6

0.8

1.0

1.2

S tr es s, ts f

2022-05-27 13:25:34 2.3.16.137 / 2.3.16.137 3

Project: Stratford Water Pollution

Boring No.: GZ-1

Sample No.: ST-1 (Tube)

Test No.: IP-1R

Description: Wet, very dark gray silt

Remarks: TX-005, Swell Pressure = 0.0696 tsf

Location: Stratford, CT

Tested By: trm

Test Date: 5/13/22

Sample Type: intact

Project No.: GTX-315388

Checked By: anm

Depth: 17-19 ft bg

Elevation: ---

Time Curve 2 of 13

Constant Load Step

Stress: 0.125 tsf

0.01 0.1 1 10 100 1000 10000

Time, min

1.6

1.4

1.2

1.0

0.8

0.6

0.4

S tr ai n, 0 10 20 30 40 50 60

Square Root of Time, √min

1.6

1.4

1.2

1.0

0.8

0.6

0.4

S tr ai n, 2022-05-27 13:25:36 2.3.16.137 / 2.3.16.137 4

Project: Stratford Water Pollution

Boring No.: GZ-1

Sample No.: ST-1 (Tube)

Test No.: IP-1R

Description: Wet, very dark gray silt

Remarks: TX-005, Swell Pressure = 0.0696 tsf

Location: Stratford, CT

Tested By: trm

Test Date: 5/13/22

Sample Type: intact

Project No.: GTX-315388

Checked By: anm

Depth: 17-19 ft bg

Elevation: ---

Time Curve 3 of 13

Constant Load Step

Stress: 0.25 tsf

0.01 0.1 1 10 100 1000 10000

Time, min

4.0

3.5

3.0

2.5

2.0

1.5

1.0

S tr ai n, 0 10 20 30 40 50 60

Square Root of Time, √min

4.0

3.5

3.0

2.5

2.0

1.5

1.0

S tr ai

2022-05-27 13:25:37 2.3.16.137 / 2.3.16.137 5

Project: Stratford Water Pollution

Boring No.: GZ-1

Sample No.: ST-1 (Tube)

Test No.: IP-1R

Description: Wet, very dark gray silt

Remarks: TX-005, Swell Pressure = 0.0696 tsf

Location: Stratford, CT

Tested By: trm

Test Date: 5/13/22

Sample Type: intact

Project No.: GTX-315388

Checked By: anm

Depth: 17-19 ft bg

Elevation: ---

Time Curve 4 of 13

Constant Load Step

Stress: 0.5 tsf

0.01 0.1 1 10 100 1000 10000

Time, min

S tr ai n, 0 10 20 30 40 50 60

Square Root of Time, √min

S tr ai

2022-05-27 13:25:38 2.3.16.137 / 2.3.16.137 6

Project: Stratford Water Pollution

Boring No.: GZ-1

Sample No.: ST-1 (Tube)

Test No.: IP-1R

Description: Wet, very dark gray silt

Remarks: TX-005, Swell Pressure = 0.0696 tsf

Location: Stratford, CT

Tested By: trm

Test Date: 5/13/22

Sample Type: intact

Project No.: GTX-315388

Checked By: anm

Depth: 17-19 ft bg

Elevation: ---

Time Curve 5 of 13

Constant Load Step

Stress: 1 tsf

0.01 0.1 1 10 100 1000 10000

Time, min

S tr ai n, 0 10 20 30 40 50 60

Square Root of Time, √min

S tr ai

2022-05-27 13:25:39 2.3.16.137 / 2.3.16.137 7

Project: Stratford Water Pollution

Boring No.: GZ-1

Sample No.: ST-1 (Tube)

Test No.: IP-1R

Description: Wet, very dark gray silt

Remarks: TX-005, Swell Pressure = 0.0696 tsf

Location: Stratford, CT

Tested By: trm

Test Date: 5/13/22

Sample Type: intact

Project No.: GTX-315388

Checked By: anm

Depth: 17-19 ft bg

Elevation: ---

Time Curve 6 of 13

Constant Load Step

Stress: 2 tsf

0.01 0.1 1 10 100 1000 10000

Time, min

S tr ai n, 0 10 20 30 40 50 60

Square Root of Time, √min

S tr ai

2022-05-27 13:25:41 2.3.16.137 / 2.3.16.137 8

Project: Stratford Water Pollution

Boring No.: GZ-1

Sample No.: ST-1 (Tube)

Test No.: IP-1R

Description: Wet, very dark gray silt

Remarks: TX-005, Swell Pressure = 0.0696 tsf

Location: Stratford, CT

Tested By: trm

Test Date: 5/13/22

Sample Type: intact

Project No.: GTX-315388

Checked By: anm

Depth: 17-19 ft bg

Elevation: ---

Time Curve 7 of 13

Constant Load Step

Stress: 4 tsf

0.01 0.1 1 10 100 1000 10000

Time, min

S tr ai n, 0 10 20 30 40 50 60

Square Root of Time, √min

S tr ai

2022-05-27 13:25:42 2.3.16.137 / 2.3.16.137 9

Project: Stratford Water Pollution

Boring No.: GZ-1

Sample No.: ST-1 (Tube)

Test No.: IP-1R

Description: Wet, very dark gray silt

Remarks: TX-005, Swell Pressure = 0.0696 tsf

Location: Stratford, CT

Tested By: trm

Test Date: 5/13/22

Sample Type: intact

Project No.: GTX-315388

Checked By: anm

Depth: 17-19 ft bg

Elevation: ---

Time Curve 8 of 13

Constant Load Step

Stress: 8 tsf

0.01 0.1 1 10 100 1000 10000

Time, min

S tr ai n, 0 10 20 30 40 50 60

Square Root of Time, √min

S tr ai

2022-05-27 13:25:43 2.3.16.137 / 2.3.16.137 10

Project: Stratford Water Pollution

Boring No.: GZ-1

Sample No.: ST-1 (Tube)

Test No.: IP-1R

Description: Wet, very dark gray silt

Remarks: TX-005, Swell Pressure = 0.0696 tsf

Location: Stratford, CT

Tested By: trm

Test Date: 5/13/22

Sample Type: intact

Project No.: GTX-315388

Checked By: anm

Depth: 17-19 ft bg

Elevation: ---

Time Curve 9 of 13

Constant Load Step

Stress: 16 tsf

0.01 0.1 1 10 100 1000 10000

Time, min

S tr ai n, 0 10 20 30 40 50 60

Square Root of Time, √min

S tr ai

2022-05-27 13:25:44 2.3.16.137 / 2.3.16.137 11

Project: Stratford Water Pollution

Boring No.: GZ-1

Sample No.: ST-1 (Tube)

Test No.: IP-1R

Description: Wet, very dark gray silt

Remarks: TX-005, Swell Pressure = 0.0696 tsf

Location: Stratford, CT

Tested By: trm

Test Date: 5/13/22

Sample Type: intact

Project No.: GTX-315388

Checked By: anm

Depth: 17-19 ft bg

Elevation: ---

Time Curve 10 of 13

Constant Load Step

Stress: 4 tsf

0.01 0.1 1 10 100 1000 10000

Time, min

48.5

48.0

47.5

47.0

46.5

46.0

45.5

S tr ai n, 0 10 20 30 40 50 60

Square Root of Time, √min

48.5

48.0

47.5

47.0

46.5

46.0

45.5

S tr ai

2022-05-27 13:25:45 2.3.16.137 / 2.3.16.137 12

Project: Stratford Water Pollution

Boring No.: GZ-1

Sample No.: ST-1 (Tube)

Test No.: IP-1R

Description: Wet, very dark gray silt

Remarks: TX-005, Swell Pressure = 0.0696 tsf

Location: Stratford, CT

Tested By: trm

Test Date: 5/13/22

Sample Type: intact

Project No.: GTX-315388

Checked By: anm

Depth: 17-19 ft bg

Elevation: ---

Time Curve 11 of 13

Constant Load Step

Stress: 1 tsf

0.01 0.1 1 10 100 1000 10000

Time, min

S tr ai n, 0 10 20 30 40 50 60

Square Root of Time, √min

S tr ai

2022-05-27 13:25:46 2.3.16.137 / 2.3.16.137 13

Project: Stratford Water Pollution

Boring No.: GZ-1

Sample No.: ST-1 (Tube)

Test No.: IP-1R

Description: Wet, very dark gray silt

Remarks: TX-005, Swell Pressure = 0.0696 tsf

Location: Stratford, CT

Tested By: trm

Test Date: 5/13/22

Sample Type: intact

Project No.: GTX-315388

Checked By: anm

Depth: 17-19 ft bg

Elevation: ---

Time Curve 12 of 13

Constant Load Step

Stress: 0.25 tsf

0.01 0.1 1 10 100 1000 10000

Time, min

S tr ai n, 0 10 20 30 40 50 60

Square Root of Time, √min

S tr ai

2022-05-27 13:25:47 2.3.16.137 / 2.3.16.137 14

Project: Stratford Water Pollution

Boring No.: GZ-1

Sample No.: ST-1 (Tube)

Test No.: IP-1R

Description: Wet, very dark gray silt

Remarks: TX-005, Swell Pressure = 0.0696 tsf

Location: Stratford, CT

Tested By: trm

Test Date: 5/13/22

Sample Type: intact

Project No.: GTX-315388

Checked By: anm

Depth: 17-19 ft bg

Elevation: ---

Time Curve 13 of 13

Constant Load Step

Stress: 0.0625 tsf

0.01 0.1 1 10 100 1000 10000

Time, min

S tr ai n, 0 10 20 30 40 50 60

Square Root of Time, √min

S tr ai

2022-05-27 13:25:48 2.3.16.137 / 2.3.16.137 15

Project: Stratford Water Pollution

Boring No.: GZ-1

Sample No.: ST-1 (Tube)

Test No.: IP-1R

Description: Wet, very dark gray silt

Remarks: TX-005, Swell Pressure = 0.0696 tsf

Location: Stratford, CT

Tested By: trm

Test Date: 5/13/22

Sample Type: intact

Project No.: GTX-315388

Checked By: anm

Depth: 17-19 ft bg

Elevation: ---

Specimen Diameter: 2.50 in

Initial Height: 1.00 in

Final Height: 0.61 in

Estimated Specific Gravity: 2.70

Initial Void Ratio: 3.53

Final Void Ratio: 1.76

Liquid Limit: 134

Plastic Limit: 78

Plasticity Index: 56

Before Test Trimmings

Before Test Specimen

After Test Specimen

After Test Trimmings

Container ID

Mass Container, gm

Mass Container + Wet Soil, gm

Mass Container + Dry Soil, gm

Mass Dry Soil, gm

Water Content, %

Void Ratio

Degree of Saturation, %

Dry Unit Weight, pcf

E5086

8.29

117.06

67.32

59.03

84.26

RING

107.75

208.81

155.68

47.929

110.85

3.53

84.75

37.197

107.75

155.68

47.929

65.35

1.76

100.00

60.979

E2310

8.18

85.48

54.93

46.75

65.35

Note: Specific Gravity and Void Ratios are calculated assuming the degree of saturation equals 100% at the end of the test.

Therefore, values may not represent actual values for the specimen.

2022-05-27 13:25:48 2.3.16.137 / 2.3.16.137 16

Project: Stratford Water Pollution

Boring No.: GZ-1

Sample No.: ST-1 (Tube)

Test No.: IP-1R

Description: Wet, very dark gray silt

Remarks: TX-005, Swell Pressure = 0.0696 tsf

Location: Stratford, CT

Tested By: trm

Test Date: 5/13/22

Sample Type: intact

Project No.: GTX-315388

Checked By: anm

Depth: 17-19 ft bg

Elevation: ---

Displacement at End of Increment

Square Root of Time Coefficients

Step Applied Stress tsf

Final Displacement in

Void Ratio

Strain at End

Sq.Rt.

T90 min

Cv ft²/s

Mv 1/tsf k ft/day

0.0696

0.125

0.250

0.500

1.00

2.00

4.00

8.00

16.0

4.00

1.00

0.250

0.0625

0.005324

0.01341

0.03414

0.06474

0.1136

0.2064

0.3077

0.3957

0.4734

0.4557

0.4246

0.3903

0.3603

3.51

3.47

3.38

3.24

3.02

2.60

2.14

1.74

1.39

1.47

1.61

1.76

1.90

0.532

1.34

3.41

6.47

11.4

20.6

30.8

39.6

47.3

45.6

42.5

39.0

36.0

949.846

299.909

139.883

130.088

142.349

146.780

146.316

146.493

140.027

348.883

427.702

1064.913

2.57e-08

8.03e-08

1.67e-07

1.70e-07

1.43e-07

1.18e-07

9.26e-08

7.04e-08

5.60e-08

2.20e-08

2.01e-08

8.99e-09

7.65e-02

1.46e-01

1.66e-01

1.22e-01

9.78e-02

9.27e-02

5.07e-02

2.20e-02

9.71e-03

1.47e-03

1.04e-02

4.57e-02

1.60e-01

5.30e-06

3.16e-05

7.48e-05

5.63e-05

3.77e-05

2.95e-05

1.27e-05

4.18e-06

1.47e-06

6.17e-07

2.48e-06

3.88e-06

Client: GZA GeoEnvironmental, Inc.

Project: Stratford Water Pollution Facility Improve.

Location: Stratford, CT Project No: GTX-315388 Boring ID: --- Sample ID: --- Depth : ---

Sample Type: --- Test Date: 05/09/22 Test Id: 665529

Tested By: ckg Checked By: bfs

Moisture Content of Soil and Rock - ASTM D2216 printed 5/11/2022 11:25:26 AM

Boring ID Sample ID Depth Description Moisture Content,%

GZ-1

GZ-1

GZ-1

GZ-1

GZ-3

ST- 1 (Tube)

SS- 10 (Jar)

SS- 7 (Jar)

SS- 9 (Jar)

SS- 5 (Jar)

17-19 ft bg

25-27 ft bg

15-17 ft bg

23-25 ft bg

10-11.6 ft bg

Wet, very dark gray silt

Moist, very dark brown silt

Moist, very dark grayish brown silt

Moist, black silt

Moist, black silt

182.3

432.5

74.1

361.8

134.5

Notes: Temperature of Drying : 110º Celsius

Location: Stratford, CT Project No: GTX-315388 Boring ID: GZ-2 Sample ID: SS-2 (Jar) Depth : 2-4 ft bg

Sample Type: jar Test Date: 05/11/22 Test Id: 665521

Tested By: ckg Checked By: bfs

Test Comment: --- Visual Description: Moist, dark brown silty sand Sample Comment: ---

Particle Size Analysis - ASTM D6913/D7928 printed 5/11/2022 10:55:24 AM

0.0010.010.11101001000

Pe rc en t F in er

Grain Size (mm)

0.

in

% Cobble

% Gravel

5.2

% Sand

67.3

% Silt & Clay Size

27.5 Sieve Name Sieve Size, mm Percent Finer Spec. Percent Complies

0.375 in

#4

#10

#20

#40

#60

#100

#140

#200

Hydrometer

9.50

4.75

2.00

0.85

0.42

0.25

0.15

0.11

0.075

Particle Size (mm)

0.0354

0.0229

0.0135

0.0095

0.0068

0.0048

0.0034

0.0014

Percent Finer

Spec. Percent Complies

Coefficients D =1.4665 mm85

D =0.5012 mm60

D =0.3628 mm50

D =0.1120 mm30

D =0.0226 mm15

D =0.0107 mm10

C =46.841u C =2.339c

Classification

ASTM N/A

AASHTO Silty Gravel and Sand (A-2-4 (0))

Sample/Test Description Sand/Gravel Particle Shape : ANGULAR

Sand/Gravel Hardness : HARD

Dispersion Device : Apparatus A - Mech Mixer

Dispersion Period : 1 minute

Est. Specific Gravity : 2.65

Separation of Sample: #200 Sieve

Location: Stratford, CT Project No: GTX-315388 Boring ID: GZ-2 Sample ID: SS-5 (Jar) Depth : 8-10 ft bg

Sample Type: jar Test Date: 05/02/22 Test Id: 665525

Tested By: ckg Checked By: bfs

Test Comment: --- Visual Description: Moist, dark gray silty sand Sample Comment: ---

Particle Size Analysis - ASTM D6913 printed 5/11/2022 10:55:25 AM

0.0010.010.11101001000

Pe rc en t F in er

Grain Size (mm)

0.

0.

% Cobble

% Gravel

6.2

% Sand

71.0

% Silt & Clay Size

22.8 Sieve Name Sieve Size, mm Percent Finer Spec. Percent Complies

0.75 in

0.5 in

0.375 in

#4

#10

#20

#40

#60

#100

#140

#200

19.00

12.50

9.50

4.75

2.00

0.85

0.42

0.25

0.15

0.11

0.075

Coefficients D =0.7037 mm85

D =0.2219 mm60

D =0.1720 mm50

D =0.0991 mm30

D =N/A15

D =N/A10

C =N/Au C =N/Ac

Classification

ASTM N/A

AASHTO Silty Gravel and Sand (A-2-4 (0))

Sample/Test Description Sand/Gravel Particle Shape : ANGULAR

Sand/Gravel Hardness : HARD

Location: Stratford, CT Project No: GTX-315388 Boring ID: GZ-5 Sample ID: SS-5 Depth : 10-12 ft bg

Sample Type: jar Test Date: 05/11/22 Test Id: 665522

Tested By: ckg Checked By: bfs

Test Comment: --- Visual Description: Moist, olive brown sand with gravel Sample Comment: ---

Particle Size Analysis - ASTM D6913/D7928 printed 5/11/2022 10:59:32 AM

0.0010.010.11101001000

Pe rc en t F in er

Grain Size (mm)

% Cobble

% Gravel

42.2

% Sand

54.7

% Silt & Clay Size

3.1 Sieve Name Sieve Size, mm Percent Finer Spec. Percent Complies

1 in

0.75 in

0.5 in

0.375 in

#4

#10

#20

#40

#60

#100

#140

#200

25.00

19.00

12.50

9.50

4.75

2.00

0.85

0.42

0.25

0.15

0.11

0.075

3.1

Coefficients D =16.3266 mm85

D =5.4552 mm60

D =2.7812 mm50

D =0.8199 mm30

D =0.4029 mm15

D =0.2707 mm10

C =20.152u C =0.455c

Classification ASTM Poorly graded SAND with Gravel (SP)

AASHTO Stone Fragments, Gravel and Sand (A-1-a (1))

Sample/Test Description

Location: Stratford, CT Project No: GTX-315388 Boring ID: GZ-14 Sample ID: SS-9 (Jar) Depth : 25-27 ft bg

Sample Type: jar Test Date: 05/02/22 Test Id: 665526

Tested By: ckg Checked By: bfs

Test Comment: --- Visual Description: Moist, light olive brown silty sand Sample Comment: ---

Particle Size Analysis - ASTM D6913 printed 5/11/2022 10:55:28 AM

0.0010.010.11101001000

Pe rc en t F in er

Grain Size (mm)

% Cobble

% Gravel

0.0

% Sand

62.4

% Silt & Clay Size

37.6 Sieve Name Sieve Size, mm Percent Finer Spec. Percent Complies

#4

#10

#20

#40

#60

#100

#140

#200

4.75

2.00

0.85

0.42

0.25

0.15

0.11

0.075

Coefficients D =0.1959 mm85

D =0.1186 mm60

D =0.0993 mm50

D =N/A30

D =N/A15

D =N/A10

C =N/Au C =N/Ac

Classification

ASTM N/A

AASHTO Silty Soils (A-4 (0))

Sample/Test Description Sand/Gravel Particle Shape : ---

Sand/Gravel Hardness : ---

Location: Stratford, CT Project No: GTX-315388 Boring ID: GZ-14 Sample ID: SS-5 Depth : 10-12 ft bg

Sample Type: jar Test Date: 05/02/22 Test Id: 665833

Tested By: ckg Checked By: bfs

Test Comment: --- Visual Description: Moist, light yellowish brown sand with silt and gravel Sample Comment: ---

Particle Size Analysis - ASTM D6913 printed 5/11/2022 10:55:29 AM

0.0010.010.11101001000

Pe rc en t F in er

Grain Size (mm)

% Cobble

% Gravel

23.9

% Sand

70.4

% Silt & Clay Size

5.7 Sieve Name Sieve Size, mm Percent Finer Spec. Percent Complies

1 in

0.75 in

0.5 in

0.375 in

#4

#10

#20

#40

#60

#100

#140

#200

25.00

19.00

12.50

9.50

4.75

2.00

0.85

0.42

0.25

0.15

0.11

0.075

5.7

Coefficients D =7.9583 mm85

D =1.4852 mm60

D =0.8934 mm50

D =0.4888 mm30

D =0.2571 mm15

D =0.1557 mm10

C =9.539u C =1.033c

Classification

ASTM N/A

AASHTO Stone Fragments, Gravel and Sand (A-1-b (1))

Sample/Test Description

Location: Stratford, CT Project No: GTX-315388 Boring ID: TP-3 Sample ID: S-2 (Bag) Depth : 2-4.5 ft bg

Sample Type: bag Test Date: 05/11/22 Test Id: 665523

Tested By: ckg Checked By: bfs

Test Comment: --- Visual Description: Moist, brown silty sand with gravel Sample Comment: ---

Particle Size Analysis - ASTM D6913/D7928 printed 5/11/2022 10:55:30 AM

0.0010.010.11101001000

Pe rc en t F in er

Grain Size (mm)

1.

% Cobble

% Gravel

23.7

% Sand

61.5

% Silt & Clay Size

14.8 Sieve Name Sieve Size, mm Percent Finer Spec. Percent Complies

3 in

2 in

1.5 in

1 in

0.75 in

0.5 in

0.375 in

#4

#10

#20

#40

#60

#100

#140

#200

Hydrometer

75.00

50.00

37.50

25.00

19.00

12.50

9.50

4.75

2.00

0.85

0.42

0.25

0.15

0.11

0.075

Particle Size (mm)

0.0365

0.0235

0.0136

0.0096

0.0068

0.0048

0.0035

0.0014

Percent Finer

Spec. Percent Complies

Coefficients D =21.8681 mm85

D =0.6436 mm60

D =0.4192 mm50

D =0.1832 mm30

D =0.0766 mm15

D =0.0441 mm10

C =14.594u C =1.182c

Classification

ASTM N/A

AASHTO Silty Gravel and Sand (A-2-4 (0))

Sample/Test Description Sand/Gravel Particle Shape : ANGULAR

Sand/Gravel Hardness : HARD

Dispersion Device : Apparatus A - Mech Mixer

Dispersion Period : 1 minute

Location: Stratford, CT Project No: GTX-315388 Boring ID: TP-6 Sample ID: S-2 (Bag) Depth : 2 ft bg

Sample Type: bag Test Date: 05/11/22 Test Id: 665524

Tested By: ckg Checked By: bfs

Test Comment: --- Visual Description: Moist, brown sand with silt and gravel Sample Comment: ---

Particle Size Analysis - ASTM D6913/D7928 printed 5/11/2022 10:55:31 AM

0.0010.010.11101001000

Pe rc en t F in er

Grain Size (mm)

1.

% Cobble

% Gravel

44.9

% Sand

46.9

% Silt & Clay Size

8.2 Sieve Name Sieve Size, mm Percent Finer Spec. Percent Complies

3 in

2 in

1.5 in

1 in

0.75 in

0.5 in

0.375 in

#4

#10

#20

#40

#60

#100

#140

#200

Hydrometer

75.00

50.00

37.50

25.00

19.00

12.50

9.50

4.75

2.00

0.85

0.42

0.25

0.15

0.11

0.075

Particle Size (mm)

0.0369

0.0233

0.0133

0.0096

0.0068

0.0048

0.0034

0.0014

8.2

Percent Finer

Spec. Percent Complies

Coefficients D =56.1283 mm85

D =8.1226 mm60

D =2.1838 mm50

D =0.3977 mm30

D =0.1642 mm15

D =0.0975 mm10

C =83.309u C =0.200c

Classification

ASTM N/A

AASHTO Stone Fragments, Gravel and Sand (A-1-b (1))

Sample/Test Description Sand/Gravel Particle Shape : ANGULAR

Sand/Gravel Hardness : HARD

Dispersion Device : Apparatus A - Mech Mixer

Dispersion Period : 1 minute

Location: Stratford, CT Project No: GTX-315388 Boring ID: GZ-1 Sample ID: ST-1 (Tube) Depth : 17-19 ft bg

Sample Type: tube Test Date: 05/09/22 Test Id: 665515

Tested By: cam Checked By: bfs

Test Comment: --- Visual Description: Wet, very dark gray silt Sample Comment: Sample contains organics

Atterberg Limits - ASTM D4318 printed 5/11/2022 11:21:52 AM

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140

Pl as tic ity

In de x

Liquid Limit

Plasticity Chart

ML or OLCL-ML

CL or OL

MH or OH

CH or OH

"A" Line

"U" Line

Symbol Sample ID Boring Depth Natural Moisture

Content,%

Liquid Limit

Plastic Limit

Plasticity Index

Liquidity Index

Soil Classification

ST-1 (Tube) GZ-1 17-19 ft bg

182 134 78 56 1.9

Sample Prepared using the WET method

Dry Strength: VERY HIGH

Dilatancy: SLOW

Toughness: LOW

Location: Stratford, CT Project No: GTX-315388 Boring ID: GZ-1 Sample ID: SS-7 (Jar) Depth : 15-17 ft bg

Sample Type: jar Test Date: 05/06/22 Test Id: 665519

Tested By: cam Checked By: bfs

Test Comment: --- Visual Description: Moist, very dark grayish brown silt Sample Comment: ---

Atterberg Limits - ASTM D4318 printed 5/11/2022 11:21:54 AM

Symbol Sample ID Boring Depth Natural Moisture

Content,%

Liquid Limit

Plastic Limit

Plasticity Index

Liquidity Index

Soil Classification

SS-7 (Jar) GZ-1 15-17 ft bg

74 n/a n/a n/a n/a

Sample Determined to be non-plastic

Dry Strength: LOW

Dilatancy: RAPID

Toughness: n/a

The sample was determined to be Non-Plastic

Location: Stratford, CT Project No: GTX-315388 Boring ID: GZ-1 Sample ID: SS-9 (Jar) Depth : 23-25 ft bg

Sample Type: jar Test Date: 05/07/22 Test Id: 665520

Tested By: cam Checked By: bfs

Test Comment: --- Visual Description: Moist, black silt Sample Comment: Sample contains organics

Atterberg Limits - ASTM D4318 printed 5/11/2022 11:21:55 AM

0 100 200 300 400 500

Pl as tic ity

In de x

Liquid Limit

Plasticity Chart

MH or OH

CH or OH

"A" Line

"U" Line

Symbol Sample ID Boring Depth Natural Moisture

Content,%

Liquid Limit

Plastic Limit

Plasticity Index

Liquidity Index

Soil Classification

SS-9 (Jar) GZ-1 23-25 ft bg

362 486 310 176 0.3

Sample Prepared using the WET method

Dry Strength: VERY HIGH

Location: Stratford, CT Project No: GTX-315388 Boring ID: GZ-3 Sample ID: SS-5 (Jar) Depth : 10-11.6 ft bg

Sample Type: jar Test Date: 05/10/22 Test Id: 665517

Tested By: cam Checked By: bfs

Test Comment: --- Visual Description: Moist, black silt Sample Comment: ---

Atterberg Limits - ASTM D4318 printed 5/11/2022 11:21:56 AM

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170

Pl as tic ity

In de x

Liquid Limit

Plasticity Chart

ML or OLCL-ML

CL or OL

MH or OH

CH or OH

"A" Line

"U" Line

Symbol Sample ID Boring Depth Natural Moisture

Content,%

Liquid Limit

Plastic Limit

Plasticity Index

Liquidity Index

Soil Classification

SS-5 (Jar) GZ-3 10-11.6 ft bg

135 163 70 93 0.7

Sample Prepared using the WET method

Dry Strength: VERY HIGH

Location: Stratford, CT Project No: GTX-315388 Boring ID: GZ-4 Sample ID: SS-7 (Jar) Depth : 14-16 ft bg

Sample Type: jar Test Date: 05/06/22 Test Id: 665518

Tested By: cam Checked By: bfs

Test Comment: --- Visual Description: Moist, very dark grayish brown silt with sand Sample Comment: Sample contains organics

Atterberg Limits - ASTM D4318 printed 5/11/2022 11:21:58 AM

Symbol Sample ID Boring Depth Natural Moisture

Content,%

Liquid Limit

Plastic Limit

Plasticity Index

Liquidity Index

Soil Classification

SS-7 (Jar) GZ-4 14-16 ft bg

47 n/a n/a n/a n/a

Sample Determined to be non-plastic

Dry Strength: LOW

Dilatancy: RAPID

Toughness: n/a

The sample was determined to be Non-Plastic

Location: Stratford, CT Project No: GTX-315388 Boring ID: GZ-1 Sample ID: ST-2 (Tube) Depth : 21-23 ft bg

Sample Type: tube Test Date: 05/20/22 Test Id: 665528

Tested By: ckg Checked By: bfs

Test Comment: --- Visual Description: Moist, very dark gray sandy silt Sample Comment: Sample contains organics

Moisture Content of Soil and Rock - ASTM D2216 printed 5/20/2022 10:23:57 AM

Boring ID Sample ID Depth Description Moisture Content,%

GZ-1 ST- 2 (Tube) 21-23 ft bg Wet, very dark gray sandy silt 429.5

Notes: Temperature of Drying : 60º Celsius

Location: Stratford, CT Project No: GTX-315388 Boring ID: GZ-1 Sample ID: ST-2 (Tube) Depth : 21-23 ft bg

Sample Type: tube Test Date: 05/10/22 Test Id: 665516

Tested By: cam Checked By: bfs

Test Comment: --- Visual Description: Wet, very dark gray sandy silt Sample Comment: Sample contains organics

Atterberg Limits - ASTM D4318 printed 5/20/2022 10:24:51 AM

0 100 200 300

Pl as tic ity

In de x

Liquid Limit

Plasticity Chart

MH or OH

CH or OH

"A" Line

"U" Line

Symbol Sample ID Boring Depth Natural Moisture

Content,%

Liquid Limit

Plastic Limit

Plasticity Index

Liquidity Index

Soil Classification

ST-2 (Tube) GZ-1 21-23 ft bg

430 366 231 135 1.5

Sample Prepared using the WET method

Dry Strength: HIGH

5/18/22 5/18/22 5/18/22

5/20/22 5/20/22

2022-05-20 15:35:20 2.3.16.137 / 2.3.16.137 1

Project: Stratford Water Pollution

Boring No.: GZ-1

Sample No.: ST-2 (Tube)

Test No.: IP-2

Description: Wet, very dark gray sandy silt

Remarks: System LTII-TX-012, Swell Pressure = 0.0648 tsf, Sample contains organic

Location: Stratford, CT

Tested By: md

Test Date: 05/05/22

Sample Type: intact

Project No.: GTX-315388

Checked By: anm

Depth: 21-23 ft bg

Elevation: ---

Displacement at End of Increment

Summary Report

0.01 0.1 1 10 100

Vertical Stress, tsf

S tr ai n,

0.01 0.1 1 10 100

Vertical Stress, tsf

-8

-7

-6

-5

-4

-3

-2

C v, in ²/ s

2022-05-20 15:35:21 2.3.16.137 / 2.3.16.137 2

Project: Stratford Water Pollution

Boring No.: GZ-1

Sample No.: ST-2 (Tube)

Test No.: IP-2

Description: Wet, very dark gray sandy silt

Remarks: System LTII-TX-012, Swell Pressure = 0.0648 tsf, Sample contains organic

Location: Stratford, CT

Tested By: md

Test Date: 05/05/22

Sample Type: intact

Project No.: GTX-315388

Checked By: anm

Depth: 21-23 ft bg

Elevation: ---

Time Curve 1 of 13

Constant Volume Step

Stress: 0.0648 tsf

0.01 0.1 1 10 100 1000 10000

Time, min

0.0

0.2

0.4

0.6

0.8

1.0

1.2

S tr es s, ts f

0 10 20 30 40 50 60

Square Root of Time, √min

0.0

0.2

0.4

0.6

0.8

1.0

1.2

S tr es s, ts f

2022-05-20 15:35:22 2.3.16.137 / 2.3.16.137 3

Project: Stratford Water Pollution

Boring No.: GZ-1

Sample No.: ST-2 (Tube)

Test No.: IP-2

Description: Wet, very dark gray sandy silt

Remarks: System LTII-TX-012, Swell Pressure = 0.0648 tsf, Sample contains organic

Location: Stratford, CT

Tested By: md

Test Date: 05/05/22

Sample Type: intact

Project No.: GTX-315388

Checked By: anm

Depth: 21-23 ft bg

Elevation: ---

Time Curve 2 of 13

Constant Load Step

Stress: 0.125 tsf

0.01 0.1 1 10 100 1000 10000

Time, min

6.5

6.0

5.5

5.0

4.5

4.0

3.5

S tr ai n, 0 10 20 30 40 50 60

Square Root of Time, √min

6.5

6.0

5.5

5.0

4.5

4.0

3.5

S tr ai

2022-05-20 15:35:23 2.3.16.137 / 2.3.16.137 4

Project: Stratford Water Pollution

Boring No.: GZ-1

Sample No.: ST-2 (Tube)

Test No.: IP-2

Description: Wet, very dark gray sandy silt

Remarks: System LTII-TX-012, Swell Pressure = 0.0648 tsf, Sample contains organic

Location: Stratford, CT

Tested By: md

Test Date: 05/05/22

Sample Type: intact

Project No.: GTX-315388

Checked By: anm

Depth: 21-23 ft bg

Elevation: ---

Time Curve 3 of 13

Constant Load Step

Stress: 0.25 tsf

0.01 0.1 1 10 100 1000 10000

Time, min

S tr ai n, 0 10 20 30 40 50 60

Square Root of Time, √min

S tr ai

2022-05-20 15:35:24 2.3.16.137 / 2.3.16.137 5

Project: Stratford Water Pollution

Boring No.: GZ-1

Sample No.: ST-2 (Tube)

Test No.: IP-2

Description: Wet, very dark gray sandy silt

Remarks: System LTII-TX-012, Swell Pressure = 0.0648 tsf, Sample contains organic

Location: Stratford, CT

Tested By: md

Test Date: 05/05/22

Sample Type: intact

Project No.: GTX-315388

Checked By: anm

Depth: 21-23 ft bg

Elevation: ---

Time Curve 4 of 13

Constant Load Step

Stress: 0.5 tsf

0.01 0.1 1 10 100 1000 10000

Time, min

S tr ai n, 0 10 20 30 40 50 60

Square Root of Time, √min

S tr ai

2022-05-20 15:35:25 2.3.16.137 / 2.3.16.137 6

Project: Stratford Water Pollution

Boring No.: GZ-1

Sample No.: ST-2 (Tube)

Test No.: IP-2

Description: Wet, very dark gray sandy silt

Remarks: System LTII-TX-012, Swell Pressure = 0.0648 tsf, Sample contains organic

Location: Stratford, CT

Tested By: md

Test Date: 05/05/22

Sample Type: intact

Project No.: GTX-315388

Checked By: anm

Depth: 21-23 ft bg

Elevation: ---

Time Curve 5 of 13

Constant Load Step

Stress: 1 tsf

0.01 0.1 1 10 100 1000 10000

Time, min

S tr ai n, 0 10 20 30 40 50 60

Square Root of Time, √min

S tr ai

2022-05-20 15:35:26 2.3.16.137 / 2.3.16.137 7

Project: Stratford Water Pollution

Boring No.: GZ-1

Sample No.: ST-2 (Tube)

Test No.: IP-2

Description: Wet, very dark gray sandy silt

Remarks: System LTII-TX-012, Swell Pressure = 0.0648 tsf, Sample contains organic

Location: Stratford, CT

Tested By: md

Test Date: 05/05/22

Sample Type: intact

Project No.: GTX-315388

Checked By: anm

Depth: 21-23 ft bg

Elevation: ---

Time Curve 6 of 13

Constant Load Step

Stress: 2 tsf

0.01 0.1 1 10 100 1000 10000

Time, min

S tr ai n, 0 10 20 30 40 50 60

Square Root of Time, √min

S tr ai

2022-05-20 15:35:28 2.3.16.137 / 2.3.16.137 8

Project: Stratford Water Pollution

Boring No.: GZ-1

Sample No.: ST-2 (Tube)

Test No.: IP-2

Description: Wet, very dark gray sandy silt

Remarks: System LTII-TX-012, Swell Pressure = 0.0648 tsf, Sample contains organic

Location: Stratford, CT

Tested By: md

Test Date: 05/05/22

Sample Type: intact

Project No.: GTX-315388

Checked By: anm

Depth: 21-23 ft bg

Elevation: ---

Time Curve 7 of 13

Constant Load Step

Stress: 4 tsf

0.01 0.1 1 10 100 1000 10000

Time, min

S tr ai n, 0 10 20 30 40 50 60

Square Root of Time, √min

S tr ai

2022-05-20 15:35:29 2.3.16.137 / 2.3.16.137 9

Project: Stratford Water Pollution

Boring No.: GZ-1

Sample No.: ST-2 (Tube)

Test No.: IP-2

Description: Wet, very dark gray sandy silt

Remarks: System LTII-TX-012, Swell Pressure = 0.0648 tsf, Sample contains organic

Location: Stratford, CT

Tested By: md

Test Date: 05/05/22

Sample Type: intact

Project No.: GTX-315388

Checked By: anm

Depth: 21-23 ft bg

Elevation: ---

Time Curve 8 of 13

Constant Load Step

Stress: 8 tsf

0.01 0.1 1 10 100 1000 10000

Time, min

S tr ai n, 0 10 20 30 40 50 60

Square Root of Time, √min

S tr ai

2022-05-20 15:35:30 2.3.16.137 / 2.3.16.137 10

Project: Stratford Water Pollution

Boring No.: GZ-1

Sample No.: ST-2 (Tube)

Test No.: IP-2

Description: Wet, very dark gray sandy silt

Remarks: System LTII-TX-012, Swell Pressure = 0.0648 tsf, Sample contains organic

Location: Stratford, CT

Tested By: md

Test Date: 05/05/22

Sample Type: intact

Project No.: GTX-315388

Checked By: anm

Depth: 21-23 ft bg

Elevation: ---

Time Curve 9 of 13

Constant Load Step

Stress: 16 tsf

0.01 0.1 1 10 100 1000 10000

Time, min

S tr ai n, 0 10 20 30 40 50 60

Square Root of Time, √min

S tr ai

2022-05-20 15:35:31 2.3.16.137 / 2.3.16.137 11

Project: Stratford Water Pollution

Boring No.: GZ-1

Sample No.: ST-2 (Tube)

Test No.: IP-2

Description: Wet, very dark gray sandy silt

Remarks: System LTII-TX-012, Swell Pressure = 0.0648 tsf, Sample contains organic

Location: Stratford, CT

Tested By: md

Test Date: 05/05/22

Sample Type: intact

Project No.: GTX-315388

Checked By: anm

Depth: 21-23 ft bg

Elevation: ---

Time Curve 10 of 13

Constant Load Step

Stress: 4 tsf

0.01 0.1 1 10 100 1000 10000

Time, min

S tr ai n, 0 10 20 30 40 50 60

Square Root of Time, √min

S tr ai

2022-05-20 15:35:32 2.3.16.137 / 2.3.16.137 12

Project: Stratford Water Pollution

Boring No.: GZ-1

Sample No.: ST-2 (Tube)

Test No.: IP-2

Description: Wet, very dark gray sandy silt

Remarks: System LTII-TX-012, Swell Pressure = 0.0648 tsf, Sample contains organic

Location: Stratford, CT

Tested By: md

Test Date: 05/05/22

Sample Type: intact

Project No.: GTX-315388

Checked By: anm

Depth: 21-23 ft bg

Elevation: ---

Time Curve 11 of 13

Constant Load Step

Stress: 1 tsf

0.01 0.1 1 10 100 1000 10000

Time, min

S tr ai n, 0 10 20 30 40 50 60

Square Root of Time, √min

S tr ai

2022-05-20 15:35:33 2.3.16.137 / 2.3.16.137 13

Project: Stratford Water Pollution

Boring No.: GZ-1

Sample No.: ST-2 (Tube)

Test No.: IP-2

Description: Wet, very dark gray sandy silt

Remarks: System LTII-TX-012, Swell Pressure = 0.0648 tsf, Sample contains organic

Location: Stratford, CT

Tested By: md

Test Date: 05/05/22

Sample Type: intact

Project No.: GTX-315388

Checked By: anm

Depth: 21-23 ft bg

Elevation: ---

Time Curve 12 of 13

Constant Load Step

Stress: 0.25 tsf

0.01 0.1 1 10 100 1000 10000

Time, min

67.0

66.5

66.0

65.5

65.0

64.5

64.0

S tr ai n, 0 10 20 30 40 50 60

Square Root of Time, √min

67.0

66.5

66.0

65.5

65.0

64.5

64.0

S tr ai

2022-05-20 15:35:34 2.3.16.137 / 2.3.16.137 14

Project: Stratford Water Pollution

Boring No.: GZ-1

Sample No.: ST-2 (Tube)

Test No.: IP-2

Description: Wet, very dark gray sandy silt

Remarks: System LTII-TX-012, Swell Pressure = 0.0648 tsf, Sample contains organic

Location: Stratford, CT

Tested By: md

Test Date: 05/05/22

Sample Type: intact

Project No.: GTX-315388

Checked By: anm

Depth: 21-23 ft bg

Elevation: ---

Time Curve 13 of 13

Constant Load Step

Stress: 0.0625 tsf

0.01 0.1 1 10 100 1000 10000

Time, min

65.0

64.5

64.0

63.5

63.0

62.5

62.0

S tr ai n, 0 10 20 30 40 50 60

Square Root of Time, √min

65.0

64.5

64.0

63.5

63.0

62.5

62.0

S tr ai

2022-05-20 15:35:35 2.3.16.137 / 2.3.16.137 15

Project: Stratford Water Pollution

Boring No.: GZ-1

Sample No.: ST-2 (Tube)

Test No.: IP-2

Description: Wet, very dark gray sandy silt

Remarks: System LTII-TX-012, Swell Pressure = 0.0648 tsf, Sample contains organic

Location: Stratford, CT

Tested By: md

Test Date: 05/05/22

Sample Type: intact

Project No.: GTX-315388

Checked By: anm

Depth: 21-23 ft bg

Elevation: ---

Specimen Diameter: 2.50 in

Initial Height: 1.00 in

Final Height: 0.40 in

Estimated Specific Gravity: 2.17

Initial Void Ratio: 12.8

Final Void Ratio: 4.52

Liquid Limit: 366

Plastic Limit: 231

Plasticity Index: 135

Before Test Trimmings

Before Test Specimen

After Test Specimen

After Test Trimmings

Container ID

Mass Container, gm

Mass Container + Wet Soil, gm

Mass Container + Dry Soil, gm

Mass Dry Soil, gm

Water Content, %

Void Ratio

Degree of Saturation, %

Dry Unit Weight, pcf

E-5745

8.31

69.15

19.8

11.49

429.50

RING

108.01

181.85

120.66

12.648

483.83

12.79

82.02

9.8156

108.01

120.66

12.648

208.28

4.52

100.00

24.539

E5250

8.02

20.34

12.32

208.28

Note: Specific Gravity and Void Ratios are calculated assuming the degree of saturation equals 100% at the end of the test.

Therefore, values may not represent actual values for the specimen.

2022-05-20 15:35:36 2.3.16.137 / 2.3.16.137 16

Project: Stratford Water Pollution

Boring No.: GZ-1

Sample No.: ST-2 (Tube)

Test No.: IP-2

Description: Wet, very dark gray sandy silt

Remarks: System LTII-TX-012, Swell Pressure = 0.0648 tsf, Sample contains organic

Location: Stratford, CT

Tested By: md

Test Date: 05/05/22

Sample Type: intact

Project No.: GTX-315388

Checked By: anm

Depth: 21-23 ft bg

Elevation: ---

Displacement at End of Increment

Square Root of Time Coefficients

Step Applied Stress tsf

Final Displacement in

Void Ratio

Strain at End

Sq.Rt.

T90 min

Cv in²/s

Mv 1/tsf k ft/day

0.0648

0.125

0.250

0.500

1.00

2.00

4.00

8.00

16.0

4.00

1.00

0.250

0.0625

0.03823

0.06388

0.1093

0.1921

0.3114

0.4300

0.5553

0.6545

0.7306

0.7006

0.6664

0.6435

0.6209

12.3

11.9

11.3

10.1

8.50

6.86

5.13

3.76

2.72

3.13

3.60

3.92

4.23

3.82

6.39

10.9

19.2

31.1

43.0

55.5

65.4

73.1

70.1

66.6

64.4

62.1

200.597

297.058

214.102

217.841

153.474

133.183

144.209

139.613

145.904

148.919

338.653

1085.822

1.69e-05

1.07e-05

1.38e-05

1.17e-05

1.29e-05

1.05e-05

6.31e-06

3.95e-06

2.29e-06

1.92e-06

1.05e-06

4.40e-07

5.90e-01

4.26e-01

3.64e-01

3.31e-01

2.39e-01

1.19e-01

6.26e-02

2.48e-02

9.51e-03

2.50e-03

1.14e-02

3.05e-02

1.21e-01

1.87e-04

8.55e-05

9.38e-05

7.25e-05

5.76e-05

2.33e-05

7.40e-06

1.83e-06

4.08e-07

8.98e-08

2.23e-07

9.96e-07

Appendix G – Environmental Laboratory Analysis

Summary of Soil Analytical Results Stratford WPCF

105 Beacon Point Road, Stratford, Connecticut GZA Job # 18.0172256.70 GZ-2

0-8

4/4/2022

Analytical Parameter Units Total Metals

Silver mg/kg 340 10,000 NA NA 3.1

Arsenic mg/kg 10 10 NA NA 4.0

Barium mg/kg 4,700 140,000 NA NA 90

Cadmium mg/kg 34 1,000 NA NA 2.9

Chromium mg/kg 100* 100* NA NA 51

Mercury mg/kg 20 610 NA NA 1.3

Lead mg/kg 400 1,000 NA NA 82

Selenium mg/kg 340 10,000 NA NA ND<2.9

Pesticides

Various mg/kg varies varies varies varies ND

Polychlorinated Biphenyls (PCBs)

PCBs mg/kg 1 10 NA NA 4.8

Volatile Organic Compounds (VOCs)

Various mg/kg varies varies varies varies ND

Semi-Volatile Organic Compounds (SVOCs)

Acenaphthylene mg/kg 1,000 2,500 8.4 84 ND<0.35

Anthracene mg/kg 1,000 2,500 40 400 ND<0.35

Benz(a)anthracene mg/kg 1 7.8 1 1 ND<0.35

Benzo(a)pyrene mg/kg 1 1 1 1 ND<0.35

Benzo(b)fluoranthene mg/kg 1 7.8 1 1 ND<0.35

Benzo(ghi)perylene mg/kg 8.4 78 1 1 ND<0.35

Benzo(k)fluoranthene mg/kg 8.4 78 1 1 ND<0.35

Chrysene mg/kg 84 780 1 1 ND<0.35

Fluoranthene mg/kg 1,000 2,500 5.6 56 ND<0.35

Indeno(1,2,3-cd)pyrene mg/kg 1.0 7.8 1 1 ND<0.35

Phenanthrene mg/kg 1,000 2,500 4 40 ND<0.35

Pyrene mg/kg 1,000 2,500 4 40 ND<0.35

Extractable Total Petroleum Hydrocarbons (ETPH) ETPH mg/kg 500 2,500 500 2,500 ND<59

Notes:

mg/kg = milligrams per kilogram ug/l= micrograms per liter

ND = indicates Non Detected above the method reporting limit

NE = criteria not established

NT = not tested

NA= Not Applicable; an SPLP or TCLP result is needed for comparison with this criteria

* = No criteria available, criteria for hexavalent chromium used as a reference.

Bold = indicated that this RSR criteria is exceeded.

Bold and Shaded = indicates one or more of the reference standards exceeded

1. Only detected constituents are shown

2. CT RSRs = Connecticut Remediation Standard Regulations

3. R-DEC = Residential Direct Exposure Criteria; applicable to soils at depths less than 15 feet below grade.

4. I/C-DEC = Industrial/Commercial Direct Exposure Criteria; applicable to soils at depths less than 15 feet below grade.

5. GA-PMC = Class GA Pollutant Mobility Criteria; applicable to soils above the seasonal low groundwater table

6. GB-PMC = Class GB Pollutant Mobility Criteria; applicable to soils above the seasonal high groundwater table

Italics = 2018 Recommended Criteria Values for Common Additional Polluting Substances; CTDEEP approval is required.

GA-PMC GB-PMC

Remediation Standard Regulations Sample ID

Sample Depth Below Grade (ft)

Sample Date

R-DEC I/C-DEC

Appendix H – SPT N vs. Depth Summary

0 20 40 60 80 100 120 140 160 180 200

De pt h Be lo w

G ra de (f t)

SPT N Value

Summary of Beacon Point Dike: SPT Value vs. Depth

B-2 B-3 B-6 B-7 B-8

B-215 B-217 BH-227 BH-228 BH-367

BH-368 CDM-5 CDM-8 GZ-5

Table Notes:

R=Boring terminated on Refusal within graph limits. C=Boring terminated with rock Core within graph Limits

1. Drivability is based on SPT N value and comparison to the ArcelorMittal Piling Handbook, 9th Edition, revision 2022, Table 11.2 (attached). This is prepared for generally feasibility and is not for bidding or production estimates.

2. Refer to boring logs for more information.

3. Boring depth presented limited to 40 feet below grade, see Appendix C for full boring logs.

4. SPT values of 50 blows/6 inches, or 100 blows/foot, represent practical SPT refusal. Refer to report including boring logs and Table 1 and 2A for interpretation and presence of bedrock. Sound bedrock will not be penetrated by driving sheet piles.

C

R

R

R

R

Impact

Vibro

Runaway Possible Easy Suitable Suitable require HYS

Very Easy Easy Suitable Very Difficult

C

0 20 40 60 80 100 120 140

De pt h Be lo w

G ra de (f t)

SPT N Value

Summary of North Road Dike: SPT Value vs. Depth

BH-231 BH-238 BH-369 BH-370 BH-371

BH-372 BH-373 BH-374 BH-375 BH-377

CDM-1 CDM-2 GZ-1(OW)

Table Notes:

R=Boring terminated on Refusal within graph limits. C=Boring terminated with rock Core within graph Limits

1. Drivability is based on SPT N value and comparison to the ArcelorMittal Piling Handbook, 9th Edition, revision 2022, Table 11.2 (attached). This is prepared for generally feasibility and is not for bidding or production estimates.

2. Refer to boring logs for more information.

3. Boring depth presented limited to 40 feet below grade, see Appendix C for full boring logs.

4. SPT values of 50 blows/6 inches, or 100 blows/foot, represent practical SPT refusal. Refer to report including boring logs and Table 1 and 2B for interpretation and presence of bedrock. Sound bedrock will not be penetrated by driving sheet piles.

R

Impact

Vibro

Runaway Possible Suitable require HYSSuitableEasy

Very Easy Easy Suitable Very Difficult

0 10 20 30 40 50 60 70 80 90 100

De pt h Be lo w

G ra de (f t)

SPT N Value

Summary of Birdseye Flood Dike: SPT Value vs. Depth

BH-150 BH-236 BH-237 BH-360 BH-361 BH-376 BH-378

BH-379 BH-380 BH-381 GZ-2 GZ-2A GZ-3

Table Notes:

R=Boring terminated on Refusal within graph limits. C=Boring terminated with rock Core within graph Limits

1. Drivability is based on SPT N value and comparison to the ArcelorMittal Piling Handbook, 9th Edition, revision 2022, Table 11.2 (attached). This is prepared for generally feasibility and is not for bidding or production estimates.

2. Refer to boring logs for more information.

3. Boring depth presented limited to 40 feet below grade, see Appendix C for full boring logs.

4. SPT values of 50 blows/6 inches, or 100 blows/foot, represent practical SPT refusal. Refer to report including boring logs and Table 1 and 2C for interpretation and presence of bedrock. Sound bedrock will not be penetrated by driving sheet piles.

0 10 20 30 40 50 60 70 80 90 100

De pt h Be lo w

G ra de (f t)

SPT N Value

Summary of Beacon Point Levee: SPT Value vs. Depth

BH-111 BH-225 BH-233 BH-234 BH-237

BH-242 BH-361 BH-363 BH-364 BH-365

BH-366 BH-382 GZ-4(OW)

Table Notes:

R=Boring terminated on Refusal within graph limits. C=Boring terminated with rock Core within graph Limits

1. Drivability is based on SPT N value and comparison to the ArcelorMittal Piling Handbook, 9th Edition, revision 2022, Table 11.2 (attached). This is prepared for generally feasibility and is not for bidding or production estimates.

2. Refer to boring logs for more information.

3. Boring depth presented limited to 40 feet below grade, see Appendix C for full boring logs.

4. SPT values of 50 blows/6 inches, or 100 blows/foot, represent practical SPT refusal. Refer to report including boring logs and Table 1 and 2 D for interpretation and presence of bedrock. Sound bedrock will not be penetrated by driving sheet piles .

R

GZA GeoEnvironmental, Inc.

An Equal Opportunity Employer M/F/V/H

January 29, 2026 File No. 18.0172256.70

Mr. John Casey Stratford Town Hall 2725 Main Street Stratford, CT 06615

Re: Supplemental Analytical Data Report Stratford Water Pollution Control Facility (WPCF) Perimeter Flood Wall Improvements Stratford, Connecticut 06115

Dear Mr. Casey:

GZA GeoEnvironmental Inc. (GZA) has prepared this supplemental analytical data report to provide the results of the environmental soil testing at 105 Beacon Point Road in Stratford, CT (Site) for Stratford WPCF (Client). The soil sampling was completed on January 21, 2026 as a follow up to previous sampling conducted on April 4, 2022 in accordance with our contract signed on February 3, 2022. This report is subject to the terms and conditions of that contract and to the Limitations presented in Appendix A.

BACKGROUND

This report presents the results of GZA's environmental subsurface explorations for the proposed WPCF Perimeter Flood Wall Improvements. The WPCF is located at 105 Beacon Point Road, Stratford, Connecticut, at the corner of Birdseye Street and Birdseye Street Extension. The WPCF is located on the western side of the Housatonic River. GZA has prepared a design for the proposed WPCF Perimeter Flood Wall Improvement Project.

For the design, GZA prepared a report titled, “Geotechnical Engineering and Environmental Data Report, Stratford Water Pollution Control Facility”, dated February 20, 2023, which included environmental test results for a composite soil sample collected at test boring GZ-2 and indicated that soils from the 0- to 8-foot depth interval contained a concentration of polychlorinated biphenyls (PCBs) above the Connecticut Residential Direct Exposure Criteria (R-DEC). The location of boring GZ-2 is shown on the attached Figure 1. GZA recommended additional subsurface explorations and soil testing to further assess the extent and degree of the detected impact and recommended preparing a Soil Management Plan (SMP) to provide guidance for soil management during construction. The subsequent additional investigations were completed, and the results are reported herein.

SCOPE OF WORK

On January 21, 2026, GZA completed three soil borings (GZ-101, GZ-102 and GZ-103) by hand and collected eight soil samples from these three borings to evaluate the extent and degree of the PCBs previously detected at GZ-2. Prior to on-Site activities, Call-Before-You-Dig was notified to identify underground utilities in the vicinity. GZA also retained Underground Surveying, Inc. to

Stratford WPCF Perimeter Flood Wall Improvements

File No. 18.0172256.70 Page | 2

Proactive by Designperform a ground penetration radar (GPR) survey and locate private underground utilities. The soil borings were advanced to depths of 2.75- to 5-feet below grade (fbg) using an electric hammer drill and macro core sampler equipped with acetate sleeves. The locations of the borings are shown on Figure 1.

The recovered soil samples were observed in the field by GZA staff for indicators of a release (e.g., staining, discoloration and/or odors) and none were observed. In addition, the soil samples were screened using a photo-ionization detector (PID) with a 10.6 eV lamp. A PID is a screening instrument that is capable of detecting certain organic vapors, including constituents of solvents, petroleum fuels and oils, but not PCBs. A PID is used as a screening instrument only and does not provide absolute values for concentrations in soil samples. The PID was calibrated to 100 parts per million (ppm) isobutylene standard prior to sample screening. A background reading of 0.0 ppm on the PID was noted during the sampling and no elevated PID readings were observed from screening the soil samples.

Representative soil samples (three samples from boring GZ-101, two samples from GZ-102, and three samples from GZ-

103) were collected from the borings, preserved for laboratory analysis and submitted under chain of custody to Complete Environmental Testing, Inc. (CET) in Stratford, Connecticut for analysis of PCBs by EPA method 8082A. Laboratory reports are provided in Appendix B.

ANALYTICAL RESULTS

The analytical results are summarized on Table 1 and were compared to the following criteria in the Connecticut Remediation Standard Regulations (CT RSRs):

Residential Direct Exposure Criteria (R-DEC)

Industrial/Commercial Direct Exposure Criteria (I/C-DEC)

Class GA Pollutant Mobility Criteria (GA-PMC)

Class GB Pollutant Mobility Criteria (GB-PMC)

The analytical results indicate that PCBs were detected at a concentration above the R-DEC in sample GZ-101 (0-2) and were either not detected or detected at concentrations at or below the R-DEC in the 7 other samples. As discussed above, PCBs were previously detected at a concentration exceeding the R-DEC in a sample from GZ-2 in April 2022.

CONCLUSIONS

Based on our field observations and the analytical results, soils from the 0- to 8-foot depth interval from boring GZ-2 contain a concentration of PCBs above the R-DEC. Boring GZ-101 was performed next to GZ-2 and discrete samples were collected from the 0 to 2-foot, 2 to 4-foot and 4 to 5-foot depth intervals to evaluate the depth at which the PCBs were previously detected in composite sample GZ-2 (0-8). Sample GZ-101 (0-2) contained PCBs at a concentration above the R-DEC; however, PCBs were not detected in the soil samples from the other depth intervals. PCBs were not detected at concentrations above the R-DEC in the five soil samples submitted for testing from GZ-102 and GZ-103.

Based on the test results, GZA recommends excavating the soils from the area around GZ-2 to a depth of at least two feet below the ground surface. The soils should be stockpiled, and additional laboratory testing should be performed to provide the analytical test results for off site disposal at a permitted facility. The recommended area of excavation is presented on Figure 1.

Stratford WPCF Perimeter Flood Wall Improvements

File No. 18.0172256.70 Page | 3

Proactive by DesignGZA also recommends implementation of a Soil Management Plan (SMP) to provide a program for handling, segregating, stockpiling, sampling, and reusing or disposing of soil/material which may be encountered during planned excavation and construction activities.

Evaluation of soil quality was limited to the locations described. Additional testing of stockpiled soils may be required to assess the extent and degree of the detected impacts and develop sufficient information to facilitate acceptance of the material by a suitable offsite soil reuse/disposal facility.

If you have any questions regarding the information presented, please feel free to contact David Barstow at 860-250-2131.

Very truly yours, GZA GEOENVIRONMENTAL, INC.

Christopher G. Eggers, P.E.

Senior Project Manager

David M. Barstow, P.E. Adam T. Henry, LEP Associate Principal Consultant/Reviewer

Attachments: Table 1: Summary of Soil Analytical Results Figure 1: Exploration Location Plan Appendix A: Limitations Appendix B: Laboratory Reports

Table

Summary of Soil Analytical Results Stratford WPCF

105 Beacon Point Road, Stratford, Connecticut GZA Job # 18.0172256.70

GZ-2 GZ-101 GZ-101 GZ-101 GZ-102 GZ-102 GZ-103 GZ-103 GZ-103

0-8 0-2 2-4 4-5 0-2 2-2.75 0-2 2-4 4-4.75

4/4/2022 1/21/2026 1/21/2026 1/21/2026 1/21/2026 1/21/2026 1/21/2026 1/21/2026 1/21/2026

Analytical Parameter Units Polychlorinated Biphenyls (PCBs) PCBs mg/kg 1 10 NA NA 4.8 2.3 ND<0.053 ND<0.057 1 ND<0.050 1 0.27 0.14

Notes:

mg/kg = milligrams per kilogram

ND = indicates Non Detected above the method reporting limit

NA= Not Applicable; an SPLP or TCLP result is needed for comparison with this criteria

Bold = indicates one or more of the reference standards exceeded

1. Only detected constituents are shown

2. CT RSRs = Connecticut Remediation Standard Regulations

3. R-DEC = Residential Direct Exposure Criteria; applicable to soils at depths less than 15 feet below grade.

4. I/C-DEC = Industrial/Commercial Direct Exposure Criteria; applicable to soils at depths less than 15 feet below grade.

5. GA-PMC = Class GA Pollutant Mobility Criteria; applicable to soils above the seasonal low groundwater table

6. GB-PMC = Class GB Pollutant Mobility Criteria; applicable to soils above the seasonal high groundwater table

7. See GZA Geotechnical Report “Geotechnical Engineering and…