ATTACHMENT 06 NWIRP Bethpage GM38 GWTP November 2025 DMR.pdf

KOMAN Government Solutions, LLC Phone (610) 363-3000 180 Gordon Drive, Suite 110 Fax (610) 363-3001 Exton, Pennsylvania 19341 www.komangs.com

9 December 2025

Ms. Kristin Granzen New York State Department of Environmental Conservation Division of Solid & Hazardous Materials 625 Broadway Albany, NY 12233-7252

Subject: GROUNDWATER DISCHARGE MONITORING/AIR EMISSION REPORT

GM-38 AREA, NWIRP BETHPAGE, NY; DER SITE # 1-30-003B-OU 2

NOVEMBER 2025 REPORTING PERIOD

Dear Ms. Granzen:

KOMAN Government Solutions, LLC (KGS) is submitting this monthly monitoring report of the groundwater discharge and air emission results for the Groundwater Treatment Plant (GWTP) located at the Former Naval Weapons Industrial Reserve Plant (NWIRP), Bethpage, NY, GM-38 Area. This report was prepared in accordance with GWTP operational requirements for DER Site # 1-30-003B-OU 2, and the SPDES Permit Equivalent # 130003B.

GWTP operational data from 1 November to 30 November 2025 are presented in Attachment A.

The plant was offline for approximately 2.0 hours as a result of backwashing LGAC units #1, #2, and #3.

As indicated in Attachment A, SPDES permitted aqueous constituents are in compliance with the established discharge limits, and all stack emissions are in compliance with established discharge goals during the current reporting period. We are in receipt of your letter dated 29 January 2025 noting updates to the discharge limits for the GWTP. Monitoring data for bis (2-ethylhexyl) phthalate was incorporated into the DMR beginning in March 2025 and will continue to be included in future DMRs.

Please contact me at 610-400-0636 with any questions or concerns you may have regarding this report.

Sincerely, KOMAN Government Solutions, LLC

Robert G. Gregory Project Manager

Attachment A: Groundwater and Air Sampling Results for November 2025

Ms. Kristin Granzen 9 December 2025

KOMAN Government Solutions, LLC Subsidiary of the Natives of Kodiak cc: J. LaClair, NYSDEC S. Johnston, NYSDEC R. O’Mara, NYSDEC Region 1 C. Engelhardt, NYSDEC Region 1 J. Pilewski, NYSDEC – Region 1 Water Engineer J. Sullivan, NYSDOH G. Ennis, Nassau County Department of Public Works T. Licata, Town of Oyster Bay M. Russo, Town of Oyster Bay B. Revell, NAVFAC Mid-Atlantic V. Varricchio, NWIRP Bethpage Facilities Management D. Brayack, Tetra Tech R. Moore, Tetra Tech R. Hoffmaster, KGS

P. Schauble, KGS GM-38 Copy

ATTACHMENT A

GROUNDWATER AND AIR SAMPLING RESULTS

NOVEMBER 2025

GM-38 Area Groundwater Remediation

Groundwater Treatment Plant

Naval Weapons Industrial Reserve Plant - Bethpage, NY

Discharge Monitoring Report

November 2025

SPDES Parameters

Process Stream

Daily

Treated

Effluent

Maximum (1)

Units

Well Depth N/A ft

Screened Interval N/A ft bgs

Sampling Date N/A

Effective Flowrate 1100 GPM 489 0 968 1,005

Total Flow N/A gallons 21,057,450 0 41,699,067 43,307,167 pH 5.5 - 8.5 SU 6.07 NS 5.93 6.27 6.00 6.96

Carbon Tetrachloride 5 mg/L ND (1.0) NS ND (1.0) ND (1.0) ND (1.0) ND (1.0)

Chloroform 5 mg/L ND (1.0) NS ND (1.0) ND (1.0) ND (1.0) ND (1.0)

1,1-Dichloroethane 5 mg/L 0.752 J NS ND (1.0) ND (1.0) 0.38 J ND (1.0)

1,2-Dichloroethane 0.6 mg/L ND (1.0) NS ND (1.0) ND (1.0) ND (1.0) ND (1.0)

1,1-Dichloroethene 5 mg/L 0.323 J NS 0.570 J 2.58 J 0.45 J ND (1.0) cis 1,2-Dichloroethene 5 mg/L 2.06 J NS 0.880 J 1.82 J 1.48 J ND (1.0) trans 1,2-Dichloroethene 5 mg/L ND (1.0) NS ND (1.0) ND (1.0) ND (1.0) ND (1.0)

Tetrachloroethene 5 mg/L 9.82 NS 4.72 J 4.35 J 7.30 J ND (1.0)

1,1,1-Trichloroethane 5 mg/L 0.304 J NS ND (1.0) ND (1.0) 0.15 J ND (1.0)

Trichloroethene 5 mg/L 31.1 NS 218 395 123.6 0.233 J

1,1,2-Trichlorotrifluoroethane 5 mg/L ND (1.0) NS 4.40 J 10.2 J 2.2 J ND (1.0)

Vinyl Chloride 2 mg/L ND (1.0) NS ND (1.0) ND (1.0) ND (1.0) ND (1.0)

1,4-Dioxane - 8270E 0.35 mg/L 1.5 NS 10 12 5.71 0.041 J

Bis(2-ethylhexyl) Phthalate

(2) Monitor mg/L ND (1.0) NS ND (1.0) ND (1.0) ND (1.0) ND (1.0)

Mercury 0.25 mg/L ND (0.10) NS ND (0.10) ND (0.10) ND (0.10) ND (0.10)

Total Suspended Solids (TSS) N/A mg/L ND (1.0) NS ND (1.0) ND (1.0) ND (1.0) ND (1.0)

Notes:

B - Method blank contamination

J - Estimated result between laboratory method detection limit and reporting limit

E - Concentration has exceeded the calibration range.

ND - Not detected above laboratory method detection limit. Limit of Detection (LOD) given in parentheses.

NR - Not Recorded

N/A - Not Applicable

NS - Not Sampled mg/L - micrograms per liter mg/L - milligrams per liter

GPM - gallons per minute

SU - standard units ft - feet ft bgs - feet below ground

(2) Bis(2-ethylhexyl)phthalate to be monitored; if compliance level of 7.5 mg/L exceeded, source identfication to be conducted and reported.

*Indicates that a quality control parameter has exceeded laboratory limits; analysis was performed out of the holding time.

11/3/25

335-395

410-430

392-412

442-504 N/A N/A570-670

(1) Wastewater discharge permit equivalence renewed on February 18, 2025. Discharge limits established for 10 years.

RW-1 RW-3

Combined Influent

(RW-1 + RW-3 +

RW-4 + RE-137)

Treated

Effluent

445 530

RW-4**

675 N/A N/A

RE-137**

630-745

20,641,617

** Effluent from RW-4 and RE-137 routed to the GWTP via a single pipline; separate flowmeters not available. RW-4 and RE-137 were set to operate at 200 gpm and

300 gpm, respectively, from 1 May thorough 23 May 2025. The flowrates were adjusted to operate at 250 gpm for both wells on 23 May 2025.

November 2025

Naval Weapons Industrial Reserve Plant - Bethpage, NY

Air Sampling Results

November 2025

DAR Parameters

Process Stream Units Discharge

Goal (1)

Sampling Date

Average Flowrate(3) CFM N/A NR 1,433

Total Flow ft3 N/A NR 61,727,727

Total Flow m3 N/A NR 1,747,935

1,2-Dichloroethane mg/m3 N/A ND ND cis 1,2-Dichloroethene mg/m3 79 ND trans 1,2-Dichloroethene mg/m3 ND ND

1,2-Dichloroethene (total) mg/m3 ≤ 100,000 79 ND

Toluene mg/m3 N/A ND ND

Total Xylene mg/m3 N/A ND ND

1,1,2-Trichloroethane mg/m3 N/A ND ND

Trichloroethene mg/m3 ≤ 2600 19,000 47

Vinyl Chloride mg/m3 ≤ 560 ND 1.0 J

Tetrachloroethene mg/m3 ≤ 5100 780 ND

Notes:

CFM - cubic feet per minute mg/m

- micrograms per cubic meter ft3 - cubic feet m3 - cubic meters

DAR - Division of Air Resources

J - Estimated result between laboratory method detection limit and reporting limit

N/A - Not Applicable

NR - Not recorded

(1) Discharge goal as approved by NYSDEC's letter dated 31 October 2013.

(2) Discharge goal is for total 1,2-Dichloroethene.

(3) The average flowrate is utilizing the readings from Blower B-1. Blower B-2

November 2025

Influent Effluent was taken offline on 11 May 2023.

Goals based on an assumed air flow rate of 8,000 CFM

11/3/25

≤ 100,000 (2)

Naval Weapons Industrial Reserve Plant - Bethpage, NY

Controlled Stack Emissions

November 2025

DAR Parameters Units Discharge

Goal (1) November 2025

Sampling Date 11/3/25

Average Flowrate CFM N/A 1,433

Total Flow ft 3 N/A 61,727,727

Total Flow m 3 N/A 1,747,935

Trichloroethene lb/hr ≤ 0.09 0.00025

Vinyl Chloride lb/hr ≤ 0.02 0.00000

1,2 Dichloroethene lb/hr ≤ 11 0.00000

1,2-Dichloroethane lb/hr N/A 0.00000

Toluene lb/hr N/A 0.00000

Total Xylene lb/hr N/A 0.00000

1,1,2-Trichloroethane lb/hr N/A 0.00000

Tetrachloroethene lb/hr ≤ 0.18 0.00000

Notes:

CFM - cubic feet per minute

DAR - Division of Air Resources ft3 - cubic feet m3 - cubic meters lb/hr - pounds per hour

N/A - Not Applicable

(1) Discharge goal as approved by NYSDEC's letter dated 31 October 2013.

Goals based on an assumed air flow rate of 8,000 CFM