Biosparge OMM Monthly Report 202502.pdf

KOMAN Government Solutions, LLC Phone (508) 366-7442 293 Boston Post Road West, Suite 100 Fax (508) 366-7445 Marlborough, Massachusetts 01752 www.komangs.com

04 March 2025

Mr. Joseph McCloud NAVFAC Mid-Atlantic

NAVFAC MIDLANT

9324 Virginia Ave Norfolk, VA 23511-3095

RE: Monthly Progress Summary Report – February 2025

Zones 1 and 2 Biosparge System Operations, Maintenance, and Monitoring (OM&M) Naval Submarine Base New London, Groton, CT Contract# N4008523D0073/Task Order# N4008524F6461

Dear Mr. McCloud, KOMAN Government Solutions, LLC/Trinity (KGS/Trinity) is pleased to provide this February 2025 Monthly Progress Summary Report, detailing a summary on the Operations, Maintenance, and Monitoring (OM&M) for the biosparge system located in Zone 1 and 2, Naval Submarine Base New London, Groton, CT:

1. OM&M Activities – February 2025

a. Performed weekly remote checks on system performance.

b. On-site system maintenance round was completed on 05 February 2025.

i. KGS/Trinity tech recorded observations.

1. Observations attached.

c. Overall, the system is running as designed.

d. Turned BSW-01 back on.

e. One VFD fault occurred on 16 February 2025 possibly due to freezing conditions.

f. The desired flowrate of 4.0 actual cubic feet per minute (acfm) at BSW-01 to BSW-12 was achieved.

g. The desired flowrate of 3.0 acfm at BSW-13 thru BSW-30 was achieved, with the exception at BSW-26.

h. Light non-aqueous phase liquid (LNAPL) gauging occurred on 05 February 2025. LNAPL was detected in monitoring wells 1MW4, 1MW11, and TMW5 at estimated thicknesses of 0.20, 0.05, and 1.9 feet, respectively.

i. LNAPL recovery at 1MW4, 1MW11, and TMW5 was conducted on 05 February 2025. A peristaltic pump was used to recover 0.5, 0.25, and 2.0 gallons of LNAPL, respectively. To date, 74.65-gallons of LNAPL have been removed at the site. A tracking summary sheet is provided as an attachment to this monthly report.

2. Submittals

a. January 2025 Monthly Report - 04 January 2025.

b. Draft Annual Report (2024) – 30 January 2025.

3. Next Month (March 2025) Planned O&MM Activities

c. Next System Maintenance Round is tentatively scheduled for 04 March 2025. This will include:

1. LNAPL gauging and recovery.

d. Address stakeholder comments on Annual Report (2024).

KOMAN Government Solutions, LLC Subsidiary of the Natives of Kodiak

4. Issues and Concerns

e. BSW-01 remains inaccessible due to a partial asphalt patch over the well cover. –

i. Update 05 March 2025. Although inaccessible, air has been turned back on to this well and it is receiving the designed flowrate.

f. BSW-02 remains inaccessible due to a partial asphalt patch over the well cover as denoted in the

June Monthly O&M Report. This well is receiving required flowrate.

g. As indicated in the January 2023 Monthly report, 1MW9 had been destroyed by others during an excavation to repair a main water line. Recommend installing a replacement well as this well serves to monitor concentrations just before they enter the Thames River.

Distribution:

L. Bidder, NSBNL EV P. Schauble, KGS/Trinity

Attachments:

Recorded O&M Observations 05 February 2025 LNAPL Gauging and Recovery Summary Table Weekly System Log February 2025

Please feel free to reach out with any additional questions/concerns.

Sincerely, KOMAN Government Solutions, LLC/Trinity

Russ McCormick, P.G. (NH, FL) Project Manager

(978) 460-9603 - mobile

Table 2 LNAPL Gauging and Recovery

Summary (2021-2025) Zones 1 and 2, Naval Submarine Base New London

Groton, Connecticut

Well ID Well Diameter Date LNAPL Thickness

(feet) Estimated LNAPL Well Volume

(gallon) LNAPL Volume Removed

(gallon) Removal Method

6/8/2021 0.87 0.1392 0.50 Bailer 7/8/2021 0.05 0.008 0.50 Bailer 8/5/2021 0.02 0.0032 0.25 Bailer

9/9/2021 ND N/A N/A N/A

10/7/2021 NM N/A N/A N/A

11/18/2021 NM N/A N/A N/A

12/16/2021 NM N/A N/A N/A

1/6/2022 NM N/A N/A N/A

2/15/2022 NM N/A N/A N/A

3/10/2022 0.1 0.016 0.25 Bailer

4/20/2022 NM N/A N/A N/A

5/10/2022 NM N/A N/A N/A

6/13/2022 ND N/A N/A N/A

7/8/2022 NM N/A N/A N/A

8/15/2022 0.07 0.0112 1.00 N/A 9/16/2022 0.05 0.008 1.5 Bailer 10/7/2022 0.2 0.032 1.5 Bailer

11/23/2022 NM N/A N/A N/A

12/8/2022 0.7 0.112 0.25 Bailer

1/11/2023 ND N/A N/A N/A

2/15/2023 ND N/A N/A N/A

3/16/2023 ND N/A N/A N/A

4/12/2023 ND N/A N/A N/A

5/9/2023 ND N/A N/A N/A

6/2/2023 ND N/A N/A N/A

7/5/2023 0.1 0.016 0.50 Bailer

8/10/2023 0.1 0.016 0.50 Bailer

9/6/2023 ND N/A N/A N/A

10/12/2023 ND N/A N/A N/A

2-inch1MW4

Summary (2021-2025) Zones 1 and 2, Naval Submarine Base New London

Groton, Connecticut

Well ID Well Diameter Date LNAPL Thickness

(feet) Estimated LNAPL Well Volume

(gallon) LNAPL Volume Removed

(gallon) Removal Method

11/20/2023 ND N/A N/A N/A

12/7/2023 ND N/A N/A N/A

1/11/2024 ND N/A N/A N/A

2/8/2024 ND N/A N/A N/A

3/19/2024 ND N/A N/A N/A

4/11/2024 ND N/A N/A N/A

5/16/2024 ND N/A N/A N/A

11/15/2024 ND N/A N/A N/A

12/3/2024 0.1 0.016 0.50 Peristaltic 1/5/2025 1 0.16 0.50 Peristaltic 2/5/2025 0.2 0.032 0.50 Peristaltic

1.25 4.50 1.00 0.50 1.00 8.25

11/23/2022 0 0 0.5 Bailer

1/11/2023 ND N/A N/A N/A

2/15/2023 ND N/A N/A N/A

3/16/2023 NM N/A N/A N/A

4/12/2023 NM N/A N/A N/A

5/9/2023 NM N/A N/A N/A

6/2/2023 ND N/A N/A N/A

7/5/2023 ND N/A N/A N/A

8/10/2023 ND N/A N/A N/A

9/6/2023 ND N/A N/A N/A

10/12/2023 ND N/A N/A N/A

11/20/2023 ND N/A N/A N/A

12/7/2023 ND N/A N/A N/A

1/11/2024 ND N/A N/A N/A

2/8/2024 ND N/A N/A N/A

2-inch1MW10

1MW4 Removed Total CY2025

2-inch1MW4

1MW4 Removed Total CY2022

1MW4 Removed Total CY2024 1MW4 Removed Total CY2023

1MW4 Removed Total CY2021

1MW4 Removed Subtotal

Summary (2021-2025) Zones 1 and 2, Naval Submarine Base New London

Groton, Connecticut

Well ID Well Diameter Date LNAPL Thickness

(feet) Estimated LNAPL Well Volume

(gallon) LNAPL Volume Removed

(gallon) Removal Method

3/19/2024 ND N/A N/A N/A

4/11/2024 ND N/A N/A N/A

5/16/2024 ND N/A N/A N/A

11/15/2024 ND N/A N/A N/A

12/3/2024 ND N/A N/A N/A

1/3/2025 ND N/A N/A N/A

2/5/2025 ND N/A N/A N/A

0.50 0.00 0.00 0.00 0.50

6/8/2021 ND N/A N/A N/A

7/8/2021 ND N/A N/A N/A

8/5/2021 ND N/A N/A N/A

9/9/2021 ND N/A N/A N/A

10/7/2021 0.16 0.0256 1.25 Bailer 11/18/2021 0.56 0.0896 1.5 Bailer 12/16/2021 0.15 0.024 1 Bailer

1/6/2022 ND N/A N/A N/A

2/15/2022 0.02 0.0032 1.25 Bailer 3/10/2022 0.5 0.08 0.5 Bailer 4/20/2022 0.1 0.016 0.5 Bailer 5/10/2022 Only on probe N/A 0.25 Bailer 6/13/2022 0.01 0.0016 0.25 Bailer

7/8/2022 ND N/A N/A N/A

8/15/2022 ND N/A N/A N/A

9/16/2022 0.21 0.0336 2 Bailer 10/7/2022 1.04 0.1664 1 Bailer

11/23/2022 0 0 0.5 Bailer 12/8/2022 0.03 0.0048 0.25 Bailer

2-inch1MW10

1MW10 Removed Total CY2025

2-inch1MW11

1MW10 Removed Subtotal

1MW10 Removed Total CY2022 1MW10 Removed Total CY2023 1MW10 Removed Total CY2024

Summary (2021-2025) Zones 1 and 2, Naval Submarine Base New London

Groton, Connecticut

Well ID Well Diameter Date LNAPL Thickness

(feet) Estimated LNAPL Well Volume

(gallon) LNAPL Volume Removed

(gallon) Removal Method

1/11/2023 2.15 0.344 2 Bailer

2/15/2023 ND N/A N/A N/A

3/16/2023 ND N/A N/A N/A

4/12/2023 ND N/A N/A N/A

5/9/2023 ND N/A N/A N/A

6/2/2023 ND N/A N/A N/A

7/5/2023 ND N/A N/A N/A

8/10/2023 ND N/A N/A N/A

9/6/2023 0.9 0.144 1 Bailer

10/12/2023 0.2 0.032 1 Bailer 11/20/2023 0.5 0.08 1 Bailer 12/7/2023 0.3 0.048 0.5 Peristaltic 1/11/2024 0.1 0.016 0.5 Peristaltic

2/8/2024 ND N/A N/A N/A

3/19/2024 ND N/A N/A N/A

4/11/2024 0.5 0.08 0.5 Peristaltic 5/16/2024 0.2 0.032 0.5 Peristaltic

11/15/2024 0.01 0.0016 0.15 Peristaltic 12/3/2024 0.1 0.016 0.5 Peristaltic 1/3/2025 0.1 0.016 0.5 Peristaltic 2/5/2025 0.05 0.008 0.25 Peristaltic

3.75 6.50 5.50 2.15 0.75

18.65 6/8/2021 0.9 0.0369 0.5 Bailer 7/8/2021 1.09 0.04469 0.75 Bailer 8/5/2021 1.48 0.06068 0.75 Bailer 9/9/2021 1.34 0.05494 2 Bailer

1MW11 Removed Total CY2025

2-inch1MW11

1-inchTMW5

1MW11 Removed Subtotal

1MW11 Removed Total CY2023 1MW11 Removed Total CY2024

1MW11 Removed Total CY2021 1MW11 Removed Total CY2022

Summary (2021-2025) Zones 1 and 2, Naval Submarine Base New London

Groton, Connecticut

Well ID Well Diameter Date LNAPL Thickness

(feet) Estimated LNAPL Well Volume

(gallon) LNAPL Volume Removed

(gallon) Removal Method

10/7/2021 0.71 0.02911 0.75 Bailer 11/18/2021 2.09 0.08569 0.5 Bailer 12/16/2021 1.5 0.0615 1.5 Bailer

1/6/2022 1.39 0.05699 1.5 Bailer 2/15/2022 0.04 0.00164 0.25 Bailer 3/10/2022 0.67 0.02747 1.25 Bailer 4/20/2022 3.00 0.123 1.5 Bailer 5/10/2022 1.85 0.07585 0.75 Bailer 6/13/2022 0.9 0.0369 0.75 Bailer 7/8/2022 0.48 0.01968 1.25 Bailer

8/15/2022 0.52 0.02132 1.5 Bailer

9/16/2022 NM N/A N/A N/A

10/7/2022 2.7 0.1107 1 Bailer

11/23/2022 NM N/A N/A N/A

12/8/2022 2.85 0.11685 1.5 Bailer 1/11/2023 4.1 0.1681 0.25 Bailer

2/15/2023 NM N/A N/A N/A

3/16/2023 6 0.246 2.0 Peristaltic 4/12/2023 3.8 0.1558 1.5 Bailer/Peristaltic 5/16/2023 NM N/A 1.0 Bailer 6/2/2023 3.7 0.1517 1.5 Bailer 7/5/2023 2 0.082 1.5 Bailer

8/10/2023 1 0.041 1.5 Bailer 9/6/2023 3.8 0.1558 1.0 Bailer

10/12/2023 2.1 0.0861 1.5 Bailer 11/2/2023 2.4 0.0984 N/A* N/A 12/7/2023 2.4 0.0984 1.5 Peristaltic 1/11/2024 5 0.205 2.0 Peristaltic 2/28/2024 9.3 0.3813 2.0 Peristaltic 3/19/2024 7 0.287 2.0 Peristaltic 4/11/2024 4 0.164 1.5 Peristaltic

1-inchTMW5

Summary (2021-2025) Zones 1 and 2, Naval Submarine Base New London

Groton, Connecticut

Well ID Well Diameter Date LNAPL Thickness

(feet) Estimated LNAPL Well Volume

(gallon) LNAPL Volume Removed

(gallon) Removal Method

5/16/2024 4 0.164 1.5 Peristaltic 11/15/2024 0.3 0.0123 1.0 Peristaltic 12/3/2024 3.7 0.1517 2.0 Peristaltic 1/3/2025 0.7 0.0287 2.0 Peristaltic 2/5/2025 1.9 0.0779 2.0 Peristaltic

6.75 11.25 13.25 12.00 4.00

47.25

11.75 22.75 19.75 14.65 5.75

74.65

Notes:

* LNAPL recovery did not occur. See monthly report.

LNAPL denotes light non-aqueous phase liquid.

N/A denotes not applicable.

ND dentoes LNAPL was not detected.

NM denotes not measured due in access issues with well.

Only wells with historical LNAPL are shown on the table. Wells that are not shown have not had LNAPL detected.

TMW5 Removed Total CY2025

Cumulative Removed Total CY2024

1-inchTMW5

Cumulative Total Removed

TMW5 Removed Total CY2021

TMW5 Removed Subtotal

TMW5 Removed Total CY2022 TMW5 Removed Total CY2023

Cumulative Removed Total CY2025

TMW5 Removed Total CY2024

Cumulative Removed Total CY2022 Cumulative Removed Total CY2023

Cumulative Removed Total CY2021