Biosparge OMM Monthly Report 202503.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 April 2025

Mr. Joseph McCloud NAVFAC Mid‐Atlantic

NAVFAC MIDLANT

9324 Virginia Ave Norfolk, VA 23511‐3095

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

a. Performed weekly remote checks on system performance.

b. On‐site system maintenance round was completed on 04 March 2025.

i. KGS/Trinity tech recorded observations.

1. Observations attached.

c. Overall, the system is running as designed.

d. Two VFD faults occurred on 07 March 2025 and 21 March 2025, possibly due to freezing conditions.

The faults were reset.

e. The weekly login was not performed for three weeks in March.

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

g. The desired flowrate of 3.0 acfm at BSW‐13 thru BSW‐30 was mostly achieved.

h. Light non‐aqueous phase liquid (LNAPL) gauging occurred on 04 March 2025. LNAPL was detected in monitoring wells 1MW4, 1MW11, and TMW5 at estimated thicknesses of 0.36, 0.01, and 0.3 feet, respectively.

i. LNAPL recovery at 1MW4, 1MW11, and TMW5 was conducted on 04 March 2025. A peristaltic pump was used to recover 0.75, 0.50, and 0.50 gallons of LNAPL, respectively. To date, 76.40‐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. February 2025 Monthly Report ‐ 04 March 2025.

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

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

c. Next System Maintenance Round is tentatively scheduled for 09 April 2025. This will include:

KOMAN Government Solutions, LLC Subsidiary of the Natives of Kodiak

1. LNAPL gauging and recovery.

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

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 04 March 2025 LNAPL Gauging and Recovery Summary Table Weekly System Log March 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

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 Systenm Maintenance Log Biosparge Treatment System

Non-CERCLA Zones I, Lower Subbase, OU4 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 Completed

3/4/s

2-in ch well

LN

APL

thi ckn ess x

0.16 gal/ 1-i nch wel l -

LN

AP

L hic kn ess (f) x

0.0 41 gal /fi

For

LN

AP

L

Vo lum es use the fo llo wi ng for mu las

: VO

Cs de no tes vo lat ile org ani c co mp ou nd s.

TOC

de top of cas ing psig po un ds per sq ua re in ga ug

e. ppm v de pa rts per mi llio n by vo lum e.

mg/ L de m icr og ra m s per lite

r. LN

AP

L th ick ne ss is ca lc ul at ed by su bt ra ct in g

De pth to

AP

L and

De pth to

W ate r m ea su re m en ls.

AP

L de lig ht no n-aq ue ou s ph ase liq uid ft fee t.

D O di ss ol ve d ox yg en . No tes

TM

W5 only co lle ct dat a if pr od uc t is l TM

W�

9.09

AM

W1

1 only co lle ct dat l 1M

W

9 09

1IO

1M

W8

W7

W6

Q.0

W4

0.0

L Q

.3 b onl y co lec t dat l

W2

9-0

1M W1

S

O.09

MW1

-1P D1

Lo ca tio n

Tim e

(ps ig)

Pr es s/

V ac

(pp mv

) VO

Cs

(mg /L)

(ft (ft

TOC

) LNA

PL D

ept h t o

(ft-

TO

C) W ate r Dep th t o

Th ic kn es s LN

AP

L

Vo lum e* (ga

l) LN

AP

L We ll

Es tim at ed

Re mo ve d (ga

l) LN

AP

L

Vo lum e

M eth

Re mo va l

No

Op era tor :. W ea th er

Da te

KGS

New Bi os pa rg e Tr ea tm en t

Sy ste m M on ito rin g We ll

Lo nd on

Co nn ec tic ut n-C

ER

CL

A

Zo nes

1 &

2, Lo we r

Su bb as e, OU4

Na val

Su bm ar in e

Bas e

Dat a

Sh eet e-c al mg

/L:

M el-

S/N

Ox yg ua rd

Po lar is

TI

-2

,T em pe ra tu

: (°F)

Am bie nt ppm

Po st-ca l ppm : P-

2, Pr es

PID

Mod el-S/ N:

M

A E

3o00

TI-

Te m pe ra tu

: (°F)

PI

-2

Pr es su re

FI

T-

1, on

PLC tot al flow

3b

7 (cu -ft)

2, Te m pe ra tu re : P-

2, Pr es re:

(°F)

FIT

-10

1, (on

PLC

tota l flow

(cu -ft)

1, Te m pe ra tu re

(Hz

(F) P-

1, Pr es

(Hz)

FIT

-20 1, Au xil iar y flow

BL

-20

1 VFD

fr eq ue nc y: BL -10

1 VFD

fre qu en cy

TS

H/

TS

L-

1, Ins ide

Tem

p. BL -20

1, To tal Ru nti me

BL

-10 1, To tal

Ru nti me

FI

T-

1, Ma in flow

(ps ig)

(ac fm

) (ac fm

(°F)

(ho urs

) (ho urs

BS

W

BS

BS

W

BS

W2

9 32

BS

W

BS

W

BS

8S W

BS

W2

BS

W1

0 413

BS

W

3.2

BS

W9

BS

W2

2-0

8SW

8 411

BS

W7

4-2 410

W6

BS

W2

1 32

BS

W5

BS

W4

W1

BS

W3

BS

W1

BS

W2

BS

W1

BS

W1

BS

W1

We ll

Bi os pa rg e

Tim e

(ac fm

) F low

ID

We ll

Bi os pa rg e

Tim e

(ac fm

) F low

O pe ra to r W ea th er Da te

New Lo nd on

C on ne ct ic ut n-C

ER

CL

A

Zo nes

1, Low er

Su bb ase , OU4 Nav al

Su bm ari ne

Bas e

Tr ea tm en t

Sy ste m Dat a

Sh eet

Bi os pa rg e

Tr ea tm en t

Sy ste m

KGS

A9

1A

Po st-ca l mg /L:

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

1.25 4.50 1.00 0.50 1.75 9.00

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

2‐inch1MW4

1MW4 Removed Total CY2022

1MW4 Removed Total CY2024 1MW4 Removed Total CY2023

1MW4 Removed Total CY2021

1MW4 Removed Total CY2025 1MW4 Removed Subtotal

2‐inch1MW10

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

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

1MW10 Removed Subtotal

1MW10 Removed Total CY2022 1MW10 Removed Total CY2023

1MW10 Removed Total CY2025 1MW10 Removed Total CY2024

2‐inch1MW10

2‐inch1MW11

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

10/7/2022 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

3.75 6.50 5.50 2.15

1.25 19.15

1MW11

1MW11 Removed Total CY2023 1MW11 Removed Total CY2024

1MW11 Removed Total CY2021 1MW11 Removed Total CY2022

1MW11 Removed Subtotal 1MW11 Removed Total CY2025

2‐inch

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 0.9 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

11/2/2023 2.4 0.0984 N/A* N/A

12/7/2023 2.4 0.0984 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

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

6.75 11.25 13.25 12.00 4.50 47.75

11.75 22.75 19.75 14.65 7.50

76.40

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.

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

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

3/6/2025 630 MS ON ON ON 51 ON 51 51 55 139244297 157681222 106 296,925,519

MS ‐ Michael Spaulding

BrA ‐ Brett Anchukaitis

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