Biosparge OMM Monthly Report 202505.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

06 June 2025

Mr. Robert Bray NAVFAC Mid-Atlantic

NAVFAC MIDLANT

9324 Virginia Ave Norfolk, VA 23511-3095

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

a. Performed weekly remote checks on system performance.

b. On-site system maintenance round was completed on 07 May 2025.

i. KGS/Trinity tech recorded observations.

1. Observations attached.

c. Overall, the system is running as designed.

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

e. 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 7 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. Further discussions on repair are warranted.

f. The wooden structure that protects the above ground poly vinyl chloride (PVC) air lines behind the Conex box was replaced with pressure treated (outdoor rated) materials on 27 May 2025. Asphalt starting shingles were placed on the finished floor to provide a non-slip grip. Refer to photolog attached to this monthly report.

g. Light non-aqueous phase liquid (LNAPL) gauging occurred on 07 May 2025. LNAPL was detected in monitoring well TMW5 at an estimated thickness of 1.06 feet. A sheen was noted on the measuring probe for 1MW4 and 1MW11.

h. LNAPL recovery at 1MW4, 1MW11, and TMW5 was conducted on 07 May 2025. A peristaltic pump was used to recover 0.5, 0.5, and 1.0 gallons of LNAPL, respectively. To date, 80.65-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. April 2025 Monthly Report - 01 May 2025.

KOMAN Government Solutions, LLC Subsidiary of the Natives of Kodiak

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

b. Next System Maintenance Round is tentatively scheduled for 10 June 2025. This will include:

1. LNAPL gauging and recovery.

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

4. Issues and Concerns

d. 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.

e. 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.

f. 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.

g. 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 07 May 2025 LNAPL Gauging and Recovery Summary Table (2021-2025) Weekly System Log May 2025 Photos of repaired wooded structure behind Conex.

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

Oate

Weae

OpeaY

Gsss unyens itn

Pressc VOCs

Monltoring Well Data Sheet Aiosparge Treatrment byNaval Submarine Base Non CERCLA Zones & 2, Lower Subbase, New London, Connecticut

(mg)

4.13

Depth to

LNAPL

(n TOC)

Shein

Depth to Water

(n-TOC) stem

LNAPL

Thickness

Estimated LNAPL Well

Volume (ga)

LNAPL Volume Removed (gal)

Removal Method

KGS

Notes onty collect data f no product is in wel

OScOect data daa aoduct sun we only colect data if no product is in wel

Date Weather

Operator

Biosparge Wel

8SW

8SW?

BSW3

8SW

8SWS

BSWS

8SW7

BSWB

8SW9

8SW10

8SW11

BSW12

BSW13

BSW14

8SW15

FIT-101 Man ow FIT-201, Auliary tow

PL101, Pressure T101, Temperatue

P-102. Pressure T102, Temperature

P-201, Pressure T-201, Temperature

P202, Pressure T+202. Temperature

Time Pressure

(psig)

.0

Treatment System Data Sheot Biosparge Treatment System

Non-CERCLA Zones 1 , Lowor Subbase, OU4 Naval Submarine Base New London, Connecticut

S.0

6,6

(actm) (actm) (psig) ('F) (psig) ("F)

(acfm)

(psig) ("F)

Flow

(psig) ('F)

DO Mode SN Oryguard Polaris 081063A91A0000 Pre-cal mgt Post-cal mgL

Biosparge Well

BSW16

BSW17

PID Model-S/N:

BSW18

Ambient ppm

BSW19

BSW20

BSW21

BSW22

BSW23

BSW24

BSW25

BSW26

BSW27

BSW28

BSW29

BL-101, Total Runtime:

BL-201, Total Runtime.

TSH/TSL-801, Inside Temp.

BSW30

BL-101 VFD frequency:

BL-201 VFD fr equency

FIT-101, (on PLC) total flow:

FIT-201, on PLC total flowW

9.0

Time

49463.5

0-6 S0.L

KGS

Pressure

(psig)

Post-cal ppm:

S-o

Flow

(acfm)

3.4

3.0

(hours) (hours) (F) (Hz) (Hz)

(cu-t) (cu-t)

Equipment

Rotary Claw Compressors

Rotary Claw

Compressors

Rotar Claw Compressos

Rotary Claw

Compressors

Rotary Claw Compressors

Heat Exchangers

Compact Filter Silencers

Rotameters

General lnspection

Electrical

Biosparge and Monitoring Wells

Ireatment Sy stem Maintenalce Log Biosparge Ireatment Sy sten

Non-CERCLA Zones 1, Lower Subbasc, OU4 Naval Submarnc Basc

Ncw Lodon, Connccticut

Suggestcd Maintenance

Chech inlct ar tilter, if nccCvsary, rcplae

Remoyc dust and dcbris fnom fan and sy stcm inlet.

Choh tthe levcl ot sy nchronizng gcat ol, levcl should be aborc the nniddlc of thc sught glass. If below, thc unnt ts lcakng ol and will roquite rraf

Mahe sure houslng is fr fom dust and dtirt.

clcan if nvcan

Remoc acousti cnclosurc and clcan tan cow lings, fan whcls, cntilation gnlles and cwing fans

Replace inlet air filter

Check the inlet srec, clcan if neessar

Change s nchronizing gear oil

Check that the sy stem 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

Suggestcd Schcdule

Monthly

Ivcry Month

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

KIS

Last Conpleted

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

1.25 4.50 1.00 0.50 3.00

10.25 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

2-inch1MW4

1MW4 Removed Total CY2022

1MW4 Removed Total CY2024 1MW4 Removed Total CY2023

1MW4 Removed Total CY2021

1MW4 Removed Subtotal

2-inch1MW10

1MW4 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

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

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

1MW10 Removed Subtotal

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

2-inch1MW10

2-inch1MW11

1MW10 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

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

5/7/2025 Sheen N/A 0.5 N/A

3.751MW11 Removed Total CY2021

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

6.50 5.50 2.15 1.75

19.65 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

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

1-inchTMW5

1MW11 Removed Total CY2023 1MW11 Removed Total CY2024

1MW11 Removed Total CY2022

1MW11 Removed Subtotal 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

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

6.75 11.25 13.25 12.00 7.00

50.25

11.75 22.75 19.75 14.65 11.75 80.65

Notes:

1-inchTMW5

Cumulative Removed Total CY2021

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

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

* 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.

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 5/1/2025 1909 KA OFF OFF OFF 0 OFF 0 0 0 141921594 160570015 BL-101/ BL-201 VFD 0 302,491,609 705,053 5/7/2025 900 KA ON ON ON 51 ON 51 52 55 141994745 160648911 107 302,643,656 152,047

5/13/2025 5/23/2025 1720 KA ON ON ON 51 ON 51 71 54 145418376 161874992 125 307,293,368 4,649,712 5/29/2025 1700 KA ON ON ON 51 ON 51 59 53 146211453 162307413 112 308,518,866 1,225,498

NO DATA

MS - Michael Spaulding BrA - Brett Anchukaitis

Biosparge Wooden Structure Repair Photographic Log

Naval Submarine Base New London Groton, CT

PHOTO 1 PHOTO 2

DATE: DATE:

5/27/2025 5/27/2025

ORIENTATION: ORIENTATION:

West to East West to East

TAKEN BY: TAKEN BY:

Russ McCormick Russ McCormick

DESCRIPTION: DESCRIPTION:

Exposed substructure.

No middle support installed.

PHOTO 3 PHOTO 4

DATE: DATE:

5/27/2025 5/27/2025

ORIENTATION: ORIENTATION:

East to West East to West

TAKEN BY: TAKEN BY:

Russ McCormick Russ McCormick

DESCRIPTION DESCRIPTION

Newly installed substructure with weathered rated materials.

Completed flooring with weathered rated material.

Completed flooring with asphalt starting shingles for non-slip grip.

{ "type": "Form", "isBackSide": false }

{ "type": "Form", "isBackSide": false }