Biosparge OMM Monthly Report 2025-06.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

02 July 2025

Mr. Robert Bray NAVFAC Mid-Atlantic

NAVFAC MIDLANT

9324 Virginia Ave Norfolk, VA 23511-3095

RE: Monthly Progress Summary Report – June 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. Bray, KOMAN Government Solutions, LLC/Trinity (KGS/Trinity) is pleased to provide this June 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 – June 2025

a. Performed weekly remote checks on system performance.

b. On-site system maintenance round was completed on 10 June 2025.

i. KGS/Trinity tech recorded observations.

1. Observations attached.

c. Overall, the system is running as designed.

d. The flowmeter on BL-101 is not working properly.

e. The desired flowrate of 4.0 actual cubic feet per minute (acfm) at BSW-02 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 8 months since this well has not received the flow. There is a new asphalt patch in the vicinity of BSW-26 performed by another contractor. It is suspected that during asphalt paving, damage to the air line may have occurred. Repairing biosparge lines is not part of this contract.

g. Light non-aqueous phase liquid (LNAPL) gauging occurred on 10 June 2025. LNAPL was detected in monitoring well TMW5 at an estimated thickness of 0.21 feet. A sheen was noted on the measuring probe for 1MW4 and 1MW11.

h. LNAPL recovery at 1MW4, 1MW11, and TMW5 was conducted on 10 June 2025. A peristaltic pump was used to recover 0.25, 1.5, and 0.25 gallons of LNAPL, respectively. To date, 82.655-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. May 2025 Monthly Report - 06 June 2025.

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

b. Next System Maintenance Round is tentatively scheduled for 08 July 2025. This will include:

KOMAN Government Solutions, LLC Subsidiary of the Natives of Kodiak

1. LNAPL gauging and recovery.

c. Inspect BSW-26 with a downhole camera to try and determine why there is no flow.

d. Repair flow meter on BL-101.

4. Issues and Concerns

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

i. Update 05 June 2025. Although inaccessible, air has been turned back on to this well but may not be getting into this well. Repair of biosparge well substructures are not within the scope of this current contract.

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 and maintaining the 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). Repair of biosparge substructures is not within the scope of the current contract.

h. As indicated in the January 2023 Monthly report, 1MW9 had been destroyed by others during an excavation to repair a main water line by another contractor. Recommend installing a replacement well as this well serves to monitor concentrations just before they enter the Thames River. Well installations are not within the scope of the current contract.

Distribution:

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

Attachments:

Recorded O&M Observations 10 June 2025 LNAPL Gauging and Recovery Summary Table (2021-2025) Weekly System Log June 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

Date

Weather

Operator

Location

MW1-1PD1

1MW1S

1MW2

1MWe

1MWE

1MW7

1MWE

1MW10

1MW11

Notes

TMWe

TMWS

Tme

DO denotes dissolved Gxyger ft denotes feet mg/L denotes micrograms per iter ppmy denotes parts per millian by voiume

LNAPL denotes ight nan-aqueous phase lquid psig denotes pounds per square in gauge

Press Vac (psig)

TOC denotes top of casing

9.00

VOCs denotes volatie organic compounds

0-00

Q.99

"For LNAPL Volumes use the following formulas

VOCs

LNAPL thickness s calaulated by subtracung Depth to LNAPL and Depth to Water measurements.

-inch wcll - LNAPL ickncss (ft) x 0.041 galfi 2-inch well - LNAPL thickncss (f) x 0.16 galf

(ppmv)

0.9 Q

-1

Non CERCLA Zones 1 & 2, LOwer Subbase, OU4 Nava 3ubmartne Base

DO

(mg/L)

4.09 3.7

Monitoring Well Data Sheet Blosparge Treatment System

Depth to

LNAPL

(ft TOC)

New London, Connectlcut

Depth to Water

(t-TOC)

G39

LNAPL

Thickness

(ft)

Sheen l9.g9 10.210)L

Estimated LNAPL Well

Volume (gal)

LNAPL Voume Removed (gal)

Rermoval Method

KGS

Notes onty collect data if no product is in well only collect data if no product is in well

Date Weather:

Operator.

olip/1s

Biosparge Well

BSW1

BSW2

BSW3

BSW4

BSW5

BSW6

BSW7

BSW8

BSW9

BSW10

BSW11

BSW12

BSW13

BSW14

BSW15

FIT-101, Main flow:

FIT-201, Auxiliary flow.

P-101, Pressure:

TI-101, Temperature:

P-102, Pressure:

TI-102, Temperature:

P-201, Pressure:

TI-201, Temperature:

PI-202, Pressure:

TI-202, Temperature:

Time

Pre-cal mg/L:

Pressure

(psig)

H7 538 5% lb15603

|.80

Treatment System Data Sheet Biosparge Treatrment Systern Non-CERCLA Zones 1, Lower Subbase, OU4 Naval Submarine Base

New London, Connecticut

Post-cal mg/L:

(acfm)

(acfm)

(psig) (F) (psig) (°F)

(acfm) Flow

(°F)

DO Model-S/N: Oxyguard Polaris 081063A91A0000

(psig)

(°F) (psig) e47

ID

JySimon

Blosparge Well

BSW16

BSW17

BSW18

PID Model-S/N:

BSW19

Ambient ppm:

BSW20

BSW21

BSW22

BSW23

BSW24

BSW25

BSW26

BSW27

BSW28

BSW29

BL-101, Total Runtime:

BSW30

BL-201, Total Runtime:

TSH/TSL-801, Inside Temp.

BL-101 VFD frequency:

BL-201 VFD fr equency:

FIT-101, (on PLC) total flow:

FIT-201, on PLC total flow:

Time Pressure

Post-cal ppm:

(psig)

5.0

507)7

KS

Flow

(acfm)

3.0

Q.0

2.2

(hours)

(hours)

(°F) (Hz) (Hz)

(cu-ft) Ssr i) bog (inort)

Equipment

Rotary Claw Compressors

Rotary Claw Compressors

Rotary Claw Compressors

Rotary Claw Compressors

Rotary Claw Compressors

Heat Exchangers

Compact Filter Silencers

Rotameters

General Inspection

Electrical

Biosparge and Monitoring Wells

Treatment System Maintenance Log Biosparge Treatment System

Non-CERCLA Zones I, Lower Subbase, O04 Naval Submarine Base

New London, Connecticut

Suggested Maintenance

Check inlet air filter, if necessary, replace

Remove dust and debris from fan and system inlet.

Check the level of synchronizing gear oil, level should be above the middle of the sight glass. If below, the unit is leaking oil and will require repair.

Make sure housing is free from dust and dirt, clean if necessary

Remove acoustic enclosure and clean fan cowlings, fan wheels, ventilation grilles and cooling fans

Replace inlet air filter

Check the inlet scree, clean if necessary

Change synchronizing gear oil

Check that the system is operating correctly

Remove dust and debris from cooling fan and heat exchanger

Remove weather hood and inspect element, clean if needed

Remove fouling and moisture buildup in rotameter when adjusting flow becomes difficult

Visual inspection from compressor inlet to air flow leaving the system. Inspect for leaks, system damage or any items that seem out of place. Repair as needed

Visual inspections of electrical lines for shorts, blown fuses, burnt out lights, or weather damage

Visually inspect biosparge and monitoring wells for broken fittings, damaged well vaults, or wells

Suggested Schedule

Monthly

Every 3 Months

Every 6 Months

Every year

Every 20,000 hours or 6 years, whatever comes first

Monthly

Every 6 months

Inspect Monthly, as needed

Monthly

Monthly

Monthly

KGS

Last Çompleted

M4

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

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 5/7/2025 sheen N/A 0.50 Peristaltic

6/10/2025 sheen N/A 0.25 Peristaltic 1.25 4.50 1.00 0.50 3.25

10.50 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

1MW4 Removed Total CY2025

2-inch1MW10

2-inch1MW4

1MW4 Removed Total CY2022

1MW4 Removed Total CY2024 1MW4 Removed Total CY2023

1MW4 Removed Total CY2021

1MW4 Removed Subtotal

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 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

5/7/2025 ND N/A N/A N/A

6/10/2025 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

1MW10 Removed Total CY2025

2-inch1MW10

2-inch1MW11

1MW10 Removed Subtotal

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

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

5/10/2022 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 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

2-inch1MW11

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

5/7/2025 Sheen N/A 0.5 N/A 6/10/2025 Sheen N/A 1.5 Peristaltic

3.75 6.50 5.50 2.15 3.25

21.15 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

1MW11 2-inch

1MW11 Removed Subtotal

1-inchTMW5

1MW11 Removed Total CY2023 1MW11 Removed Total CY2024

1MW11 Removed Total CY2021 1MW11 Removed Total CY2022

1MW11 Removed Total CY2025

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

5/16/2023 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 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 5/7/2025 1.06 0.04346 1.0 Peristaltic

6/10/2025 0.21 0.00861 0.3 Peristaltic 6.75

11.25 13.25 12.00 7.25

50.50

11.75 22.75 19.75 14.65

TMW5 Removed Total CY2021

TMW5 Removed Subtotal

TMW5 Removed Total CY2022 TMW5 Removed Total CY2023 TMW5 Removed Total CY2024

Cumulative Removed Total CY2022 Cumulative Removed Total CY2023

TMW5 Removed Total CY2025

Cumulative Removed Total CY2024

1-inchTMW5

Cumulative Removed Total CY2021

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

13.75 82.65

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.

Cumulative Total Removed Cumulative Removed Total CY2025

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 6/6/2025 1040 KA ON ON ON 51 ON 51 60 53 147190668 162867761 113 310,058,429 1,539,563

6/14/2025 917 KA ON ON ON 51 ON 51 NA 55 147538593 163156193 N/A 310,694,786 636,357 6/26/2025 1134 KA ON ON ON 51 ON 51 NA 53 147538593 164285736 Manifold Low flow N/A 311,824,329 1,129,543

MS - Michael Spaulding BrA - Brett Anchukaitis

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