Biosparge OMM Monthly Report 202504full.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

01 May 2025

Mr. Joseph McCloud NAVFAC Mid-Atlantic

NAVFAC MIDLANT

9324 Virginia Ave Norfolk, VA 23511-3095

RE: Monthly Progress Summary Report – April 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 April 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 – April 2025

a. Performed weekly remote checks on system performance.

b. On-site system maintenance round was completed on 09 April 2025.

i. KGS/Trinity tech recorded observations.

1. Observations attached.

c. Overall, the system is running as designed.

d. A main and auxiliary low flow warning was noted on 08 April 2025. The alarms deactivated within less than one minute.

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

f. The desired flowrate of 3.0 acfm at BSW-13 through BSW-30 was mostly achieved, with the exception at BSW-26. It has now been at least 6 months since this well has not received the flow. There is a new asphalt patch surrounding BSW-26 performed by another contractor. It is suspected that during asphalt paving, damage to the air line may have occurred. Further discussions on repair are warranted.

g. An oil change was completed on both blowers and air filters replaced on 09 April 2025. The used oil was disposed of at the hazardous waste facility. The old filters were disposed of as municipal trash.

h. The wooden structure that protects above the ground poly vinyl chloride (PVC) air lines behind the Conex box is severely deteriorated. Original construction of this structure by others was built out of indoor rated wood, rather than outdoor rated (i.e. pressure treated). This deterioration represents a safety hazard and should be replaced.

i. Light non-aqueous phase liquid (LNAPL) gauging occurred on 09 April 2025. LNAPL was detected in monitoring well TMW5 at estimated thicknesses of 1.2 feet. A grease like substance was detected on the probe upon retrieval at 1MW4, but it was not thick enough to measure. A strong petroleum odor emanating from the inside casing at 1MW11 was observed but no product was measured.

KOMAN Government Solutions, LLC Subsidiary of the Natives of Kodiak

j. LNAPL recovery at 1MW4 and TMW5 was conducted on 09 April 2025. A peristaltic pump was used to recover 0.75, and 1.5 gallons of LNAPL, respectively. To date, 78.65-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. March 2025 Monthly Report - 02 April 2025.

b. Final Annual Report (2024) – 03 April 2025.

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

c. Next System Maintenance Round is tentatively scheduled for 07 May 2025. This will include:

1. LNAPL gauging and recovery.

d. Schedule repair of the wooden structure behind the Conex box.

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. BSW-26 is not receiving flow. It is suspected that the air line may have been damaged during a recent re-paving effort (performed by another contractor). Additional discussion regarding repair is warranted.

h. 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 09 April 2025 LNAPL Gauging and Recovery Summary Table Weekly System Log April 2025 Photos of damaged wooded structure behind Conex.

Photo of new asphalt paving surrounding BSW-26.

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 3/4/2025 0.36 0.0576 0.75 Peristaltic 4/9/2025 ND N/A 0.75 Peristaltic

1.25 4.50 1.00 0.50 2.50 9.75

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

1MW4 Removed Total CY2025 1MW4 Removed Subtotal

2-inch1MW10

2-inch1MW4

1MW4 Removed Total CY2022

1MW4 Removed Total CY2024 1MW4 Removed Total CY2023

1MW4 Removed Total CY2021

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

1/11/2024 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 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

3/4/2025 ND N/A N/A N/A

4/9/2025 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

2-inch1MW11

1MW10 Removed Total CY2025 1MW10 Removed Total CY2024

2-inch1MW10

1MW10 Removed Subtotal

1MW10 Removed Total CY2022 1MW10 Removed Total CY2023

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

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 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 3/4/2025 0.01 0.0016 0.5 Peristaltic

4/9/2025 ND N/A N/A N/A

3.75 6.50 5.50 2.15

2-inch1MW11

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

1.25 19.15

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

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

1MW11 Removed Total CY2025 1MW11 Removed Subtotal

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

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 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 3/4/2025 0.3 0.0123 0.5 Peristaltic 4/9/2025 1.2 0.0492 1.5 Peristaltic

6.75 11.25 13.25 12.00 6.00

49.25

11.75 22.75 19.75 14.65 9.75

78.65

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.

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

TMW5 Removed Total CY2025

Cumulative Removed Total CY2024

Cumulative Removed Total CY2021

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

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.

NSBNL Biosparge Weekly System Check

Date Time Operator

HE-101

ON/OFF

HE-201

ON/OFF

BL-101

ON/OFF

BL-101

VFD (Hz)

BL-201

ON/OFF

BL-201

VFD (Hz)

FIT-101

(scfm)

FIT-201

(scfm)

FIT-101

Total Flow

(cuFT)

FIT-201

Total Flow

(cuFT)

Alarms / Faults Active

Combined Injection Rate (scfm)

Total Combined Flow Volume (FIT-101 + FIT-

201) (cuFT)

Weekly Injection Flow Vol (cuFT)

Comments 4/3/2025 700 MS ON ON ON 51 ON 51 52 56 140103121 158603671 108 298,706,792 445,656

4/10/2025 850 MS ON ON ON 51 ON 51 52 57 140570745 159095433 109 299,666,178 959,386 4/17/2025 745 MS ON ON ON 51 ON 51 52 55 141063467 159627536 107 300,691,003 1,024,825 4/23/2025 1529 KA ON ON ON 51 ON 51 52 55 141585676 160200880 107 301,786,556 1,095,553

MS - Michael Spaulding KA - Kevin Anderson