APPROVAL of SIUGP RegistrationCTSIU0026.pdf

Permit No. CTSIU0026 1

79 Elm Street • Hartford, CT 06106-5127 www.ct.gov/deep Affirmative Action/Equal Opportunity Employer

APPROVAL OF REGISTRATION:

GENERAL PERMIT FOR THE DISCHARGE OF WASTEWATERS FROM

SIGNIFICANT INDUSTRIAL USERS (SIU)

ISSUED TO:

Permittee Address: Location Address:

U.S. Naval Submarine Base New London U.S. Naval Submarine Base New London NAVFAC MIDLANT PWD NLON Env. Div. (SUBASENLON) Box 400 Corner of Route 12 and Crystal Lake Rd 439 Tautog Avenue, Room 104 Groton, CT 06349 Groton, CT 06349

Application No.: 202105134

Permit No.: CTSIU0026

Permit Expiration Date: October 30, 2025

In accordance with Section 22a-430b of the Connecticut General Statutes (“CGS”) as amended, the Commissioner of Energy and Environmental Protection (“the Commissioner”) hereby approves a Registration filed by U.S. Naval Submarine Base New London (“Permittee”), in accordance with Section 4(h) of the General Permit for the Discharge of Wastewaters from Significant Industrial Users, issued on October 30, 2020 (“SIU GP”). This Approval of Registration is based on Application No. 202105134, received on April 28, 2021, and the administrative record established in the processing of such application.

The Permittee is hereby authorized to discharge up to 490,000 gallons per day of wastewaters into the Groton Publicly Owned Treatment Works (“POTW”). Classifications of wastewater include:

• DSN 201-1: A maximum of 9,999 gpd (8,000 gpd average) of fire-fighting training wastewater (non-PFAS),

• DSN 202-1: A maximum of 4,000 gpd (1,500 gpd average) (flows estimated) of water jet cutting wastewater,

• DSN 203-1: A maximum of 43,200 gpd (6,700 gpd average) of pretreated oily wastewater treated at Building 29 – Power Plant,

• DSN 204-1: A maximum of 45,000 gpd (average 7,000 gpd) of brackish and pretreated oily wastewater generated from various sources, including vessels, at SUBASENLON and treated at Building 553,

• DSN 205-1: A maximum of 5,000 gpd (flow estimated) of non-contact cooling water from the draining of existing inventoried chillers and new chillers to be installed or inventoried,

• DSN 206-1: A maximum of 500 gpd (flow estimated) of air compressor condensate from locations throughout SUBASENLON, Permit No. CTSIU0026 2

• DSN 207-1: A maximum of 3,200 gpd (flow estimated) of vehicle maintenance wastewater from Building 107 (South)-Fire Department, Building 460-Auto Hobby Shop, and Building 611-MWR POV Wash Rack,

• DSN 208-1: A maximum of 5 gpd (flow estimated) of water quality analysis wastewater,

• DSN 209-1: A maximum of 50 gpd (flow estimated) of food processing wastewater from the cleaning of refrigerated box trailers at Building 175,

• DSN 210-1: A maximum of 999 gpd (320 gpd average) (flow estimated) of hydrostatic pressure testing chamber drain wastewater from Building 478 and other locations at

SUBASENLON,

• DSN 211-1: A maximum of 9,500 gpd (<3,500 gpd average) of pretreated stormwater from the truck loading/off-loading area at building 549 and the above-ground storage tanks (AST) containment area, groundwater infiltration, tank bottom condensate water from petroleum storage tanks, and Diesel Fuel Marine (DFM) stormwater containment area from B549,

• DSN 212-1: A maximum of 15,000 gpd (900 gpd average) of Building 29 Power Plant North utility trench dewatering wastewater composed of stormwater, groundwater, steam condensate and pipe condensate,

• DSN 213-1: A maximum of 999 gpd (flow estimated) of decanted water generated from catch basin cleaning conducted at catch basins throughout SUBASENLON,

• DSN 214-1: A maximum of 999 gpd (100 gpd average) of wastewater generated at Building 615 from the washing of small boats, washing of miscellaneous pieces of non-oily marine equipment including the use of cleaning agents, and waters generated from the testing of marine engines.

• DSN 215-1: A maximum of 30,000 gpd (flow estimated) of boiler blowdown and wastewater and steam condensate at the Power Plant Building 29,

• DSN 216-1: A maximum of 999 gpd (flow estimated) of boiler blowdown and maintenance wastewater from multiple natural gas or oil-fired boilers used to heat individual buildings at SUBASENLON,

• DSN 217-1: A maximum of 302 gpd (flow estimated) of parts cleaner wastewater at Building 88,

• DSN 218-1: A maximum of 9,500 gpd (flow estimated) of cooling tower blowdown from multiple buildings at SUBASENLON,

• DSN 219-1: A maximum of 150,000 gpd (flow estimated) of swimming pool draining, including 7,000 gpd of swimming pool filter backwash generated at Buildings 592, 465, 141, and 120,

• DSN 220-1: A maximum of 12,500 gpd (2,500 gpd average quarterly) (flow estimated) of fire suppression system testing wastewater generated from multiple buildings at

SUBASENLON,

• DSN 221-1: A maximum of 5,000 gpd (flow estimated) of building maintenance wastewater generated from multiple buildings at SUBASENLON,

• DSN 222-1: A maximum of 9,999 gpd (flow estimated) of infiltrated groundwater and stormwater, potentially including condensate potable water collected in utility equipment manholes, vaults, pits, sumps, and trenches at SUBASENLON,

• DSN 223-1: A maximum of 20,000 gpd (4,700 gpd average) of water softener regeneration wastewater from the “Low Temperature” water softener system at Building 29 Power Plant,

• DSN 224-1: A maximum of 72,000 gpd (24,700 gpd average) of reverse osmosis reject wastewater generated at the Building 29 Power Plant,

• DSN 225-1: has been removed,

• DSN 226-1: A maximum of 12,400 gpd (3,150 gpd average) (flow estimated) of natural gas condensate generated from exhaust and heat exchangers from multiple buildings at

SUBASENLON,

• DSN 227-1: A maximum of 4,800 gpd (1,600 gpd per cycle average) of granular activated

Permit No. CTSIU0026 3 carbon backwash/regeneration wastewater at Building 29 Power Plant,

• DSN 228-1: A maximum of 9,000 gpd (flow estimated) of ice machine condenser cooling, condensate and miscellaneous drippings from ice machines from multiple buildings at SUBASENLON both currently active and planned,

• DSN 229-1: A maximum of 400 gpd (flow estimated) of health care related wastewaters from the Building 449 Health Clinic,

• DSN 230-1: A maximum of 990 gpd (flow estimated) of dental care wastewater from the Building 575 Dental Clinic,

• DSN 231-1: A maximum of 12 gpd (flow estimated) of dental cutting and grinding wastewater from the Building 575 Dental Clinic dental mold and fabrication restoration operations.

Note: Where a DSN is identified as "flow estimated", the flow volumes are based on and approved as one-time measurements and/or calculations and not a dedicated flow meter.

The Permittee requested the Commissioner’s approval for a Minor Variance to discharge up to 8 lbs./day of Nitrate-nitrite (as N) for Discharge Serial Number 226-1. This Minor Variance is hereby granted in accordance with section 7(a) of the SIU GP.

The wastewater shall be discharged in accordance with the terms and conditions of the SIU GP and the following conditions:

(A) Definitions. The definitions of the terms used in this Approval of Registration to discharge under the SIU GP shall be the same as the definitions as described in Appendix A of the SIU GP, Section 22a-423 of the CGS and Section 22a-430-3(a) of the Regulations of Connecticut State Agencies (“RCSA”), unless otherwise indicated below. As used in this Approval of Registration to discharge under the SIU GP, the definitions of the following terms shall apply:

"----" in the limits column on the monitoring table means a limit is not specified, but a value must be reported on the Discharge Monitoring Report (“DMR”).

"Annually", in the context of a sampling/reporting frequency, means the samples can be collected at any time during the calendar year and, if reporting is required, results must be reported in the month of June. The date of sample must be included with required DMRs.

“average daily flow” means the average of all total daily flows measured during the reporting period.

“composite” as a sample type in this permit means a collection of aliquots taken at least once every four hours over a full operating day.

“gpd” means gallons per day.

“gpm” means gallons per minute.

“lb/d” means pounds per day.

“Maximum Daily Flow” means the greatest volume of wastewater to be discharged over an operating day.

"NA" as a monitoring table abbreviation means "not applicable".

“ND” as a monitoring table abbreviation means “non-detectable.”

Permit No. CTSIU0026 4

"NR" as a monitoring table abbreviation means "not required".

"Quarterly", in the context of a sampling frequency, means samples must be collected in the months of March, June, September and December.

"Range During Month" or "RDM", as a sample type, means the lowest and the highest values of all of the monitoring data for the reporting month.

"Range During Sampling" or "RDS", as a sample type, means the maximum and minimum of all values recorded as a result of analyzing each grab sample of; 1) a Composite Sample, or 2) the grab samples used to determine a Grab Sample Average. For those permittees with continuous monitoring and recording pH meters, Range During Sampling shall mean the maximum and minimum readings recorded with the continuous monitoring device during the collection of a Composite Sample or the grab samples used to determine Grab Sample Average.

"Semi-Annually", in the context of a sampling frequency, means samples must be collected in the months of June and December.

“S.U.” means Standard Units.

"Twice per Month", in the context of sample frequency, means two samples per calendar month collected no less than twelve (12) days apart.

“μg/l” means micrograms per liter.

(B) Sampling Requirements. All samples shall be comprised of only those wastewaters described in the table(s) below and in compliance with the requirements of Section 5A(b) and 5B(b) of the SIU GP, as applicable.

(C) Effluent limitations and monitoring requirements. The discharge shall not exceed and shall otherwise conform to the specific terms and conditions of Section 5, 5A and 5B of the SIU GP, as applicable, and shall be further restricted by and monitored in accordance with the table(s) described below:

Permit No. CTSIU0026 5

Table A (NetDMR Reporting Not Required)

Discharge Serial Number: 201-1 Monitoring Location: 1 Wastewater Description: Fire Fighting Training (B520). Firefighting training clothes washer, emergency air breathing system, eye wash station, emergency shower, utility sink, and maintenance wastewater (maximum of 9,999 gpd of other non-process wastewater)

Monitoring Location Description: From the sample line of the outfall pipe from the discharge pump

Discharge is to: Town of Groton Water Pollution Control Facility

Table Remark:

In accordance with Table 5B-3, this discharge, at the authorized Total Maximum Daily Flow, does not have a prescribed monitoring frequency, unless otherwise directed by the POTW Authority, but must comply with the effluent limits and conditions of Section 5B(a) of the SIU GP. The permittee shall maintain records of monitoring data representative of the current discharge to assure compliance. All monitoring shall be done in accordance with the requirements of Section 5B(b) of the SIU GP.

Permit No. CTSIU0026 6

Table B—(NetDMR Reporting Required)

Discharge Serial Number: 202-1 Monitoring Location: 1

Wastewater Description: Water Jet Cutter in Buildings 40 and 478 (maximum of 4,000 gpd of cutting and grinding wastewater)

Monitoring Location Description: Water jet cutter bottom drain or temporary hose to drain the tanks

Discharge is to: Town of Groton Water Pollution Control Facility

PARAMETER UNITS

FLOW/TIME BASED MONITORING INSTANTANEOUS MONITORING

Average Daily Limit

Maximum Daily Limit

Sample/Reporting Frequency

Sample Type or Measurement to be Reported

Instantaneous Limit or Required Range

Sample/ Reporting Frequency

Sample Type or Measurement to be Reported

Aluminum, total mg/l NA NA NR NA ---- Annually1 Grab Copper, total mg/l NA NA NR NA 2.0 Annually1 Grab Chromium, total mg/l NA NA NR NA 2.0 Annually1 Grab Flow, day of sampling1 gpd NA 4,000 Annually1 Total Daily Flow NA NR NA

Iron, total mg/l NA NA NR NA ---- Annually1 Grab Lead, total mg/l NA NA NR NA 0.50 Annually1 Grab Molybdenum, total mg/l NA NA NR NA 4.0 Annually1 Grab Nickel, total mg/l NA NA NR NA 2.0 Annually1 Grab Total Petroleum Hydrocarbons 2 mg/l NA NA NR NA 100.0 Annually1 Grab pH, day of sampling S.U. NA NA NR NA 5.0 – 12.0 Annually1 Grab Solids, total suspended mg/l NA NA NR NA 600.0 Annually1 Grab

Zinc, total mg/l NA NA NR NA 2.0 Annually1 Grab Table Footnotes:

1 Annual sampling shall be conducted from one (1) tank drain each year if a discharge occurs during any calendar year. Sample results from annual sampling shall be reported on June DMRs (see definition of “Annually” in Section (A) of this approval).

2 Analysis shall be performed using test methods approved by the most recent publication of 40 CFR 136 and reported as Total Petroleum Hydrocarbons.

Table Remark:

Note that discharge is expected to be annual at most.

For cases where the Permittee uses data from a single discharge location to represent multiple discharges across the site, the Permittee shall stagger the compliance monitoring across other representative locations.

Permit No. CTSIU0026 7

Table C—(NetDMR Reporting Required)

Discharge Serial Number: : 203-1 Monitoring Location: 1 Wastewater Description: Oil Water Separation Treatment Wastewater (B29). Wastewater from oil tank condensation, utility trench wastewater from industrial operations inside the power plant, incidental stormwater, groundwater, steam condensate and pipe condensate, groundwater from dewatering the inside fuel tank containment area and ground water seepage/leak from the north and south tunnels of the power plant to the power plant trough, steam condensate return, air compressor condensate wastewater, and dewatering waters. (maximum of 43,200 gpd of other process wastewater) Monitoring Location Description: Outlet piping from the oil/water separator

Discharge is to: Town of Groton Water Pollution Control Facility

PARAMETER UNITS

FLOW/TIME BASED MONITORING INSTANTANEOUS MONITORING

Average Daily Limit

Maximum Daily Limit

Sample/Reporting Frequency2

Sample Type or Measurement to be Reported

Instantaneous Limit or Required Range

Sample/ Reporting Frequency2

Sample Type or Measurement to be Reported

Copper, total mg/l NA 2.0 Monthly Composite 2.0 NR Grab Flow, average daily1 gpd ---- NA Daily/Monthly Total Daily Flow NA NR NA

Flow, maximum daily1 gpd NA 43,200 Daily/Monthly Total Daily Flow NA NR NA

Flow, day of sampling gpd NA 43,200 Monthly Total Daily Flow NA NR NA

Lead, Total mg/l NA 0.5 Monthly Composite 0.5 NR Grab pH, day of sampling

S.U. NA NA NR NA 5.0 – 12.0 NR RDS

pH, minimum S.U. NA NA NR NA 5.0 NR Continuous pH, maximum S.U. NA NA NR NA 12.0 NR Continuous Total Petroleum Hydrocarbons 3 mg/l NA 100.0 Monthly Grab Sample Average

100 NR Grab

Zinc, Total mg/l NA 2.0 Monthly Composite 2.0 NR Grab Table Footnotes:

1 For this parameter, the Permittee shall maintain at the facility a record of the Total Daily Flow for each day of discharge and shall report the Average Daily Flow and the Maximum Daily Flow for each sampling month.

2 Reporting shall be in accordance with Section 5B of the SIU GP.

3 Analysis shall be performed using test methods approved by the most recent publication of 40 CFR 136 and reported as Total Petroleum Hydrocarbons.

Permit No. CTSIU0026 8

Table D—(NetDMR Reporting Required)

Discharge Serial Number: 204-1 Monitoring Location: 1 Wastewater Description: Oily water and wastewater treatment facility (B553). Bilge oily wastewater (seawater, water leakage from machinery, and freshwater wash downs), condenser tube wastewater, fuel compensating, ballast potable water, maintenance activities of the REC Tank, and vehicle equipment washing wastewaters (high pressure washing of cranes, tanker trucks (exteriors), engines, pulleys and wire ropes, and cart vehicles), tank bottom condensate water from petroleum storage tanks, plus similarly impacted oily waters generated from on-base activities, and brackish wastewater from the Low Temperature Water Softener. (maximum of 45,000 gpd of other process wastewater) Monitoring Location Description: Final outfall pipe after the flow meter

Discharge is to: Town of Groton Water Pollution Control Facility

PARAMETER UNITS

FLOW/TIME BASED MONITORING INSTANTANEOUS MONITORING

Average Daily Limit

Maximum Daily Limit

Sample/Reporting Frequency

Sample Type or Measurement to be Reported

Instantaneous Limit or Required Range

Sample/ Reporting Frequency

Sample Type or Measurement to be Reported

Copper, total mg/l NA 2.0 Monthly Composite 2.0 NR Grab Flow, average daily1 gpd ---- NA Daily/Monthly Total Daily Flow

NA NR NA

Flow, maximum daily1 gpd NA 45,000 Daily/Monthly Total Daily Flow

NA NR NA

Flow, day of sampling gpd NA 45,000 Monthly Total Daily Flow

NA NR NA

Lead, Total mg/l NA 0.5 Monthly Composite 0.5 NR Grab Nickel, Total mg/l NA 2.0 Monthly Composite 2.0 NR Grab pH, day of sampling

S.U. NA NA NR NA 5.0 – 12.0 Monthly RDS pH, minimum S.U. NA NA NR NA 5.0 Continuous/Monthly Continuous pH, maximum S.U. NA NA NR NA 12.0 Continuous/Monthly Continuous Total Petroleum Hydrocarbons 3 mg/l NA 100.0 Monthly Grab Sample Average

100 NR Grab

Zinc, Total mg/l NA 2.0 Monthly Composite 2.0 NR Grab Table Footnotes:

1 For this parameter, the Permittee shall maintain at the facility a record of the Total Daily Flow for each day of discharge and shall report the Average Daily Flow and the Maximum Daily Flow for each sampling month or Flow Day of Sampling as applicable.

2 Analysis shall be performed using test methods approved by the most recent publication of 40 CFR 136 and reported as Total Petroleum Hydrocarbons.

Table Remark:

The Permittee shall collect all vertical launch system after launch, hydro blast, used and waste oil from submarines and steam phosphate wastes and dispose of these materials through a licensed hauler in a manner acceptable to the Commissioner.

Permit No. CTSIU0026 9

TABLE E - NetDMR Reporting Not Required Discharge Serial Number: 205-1 Monitoring Location: 1 Wastewater Description: Non-contact cooling wastewater from the draining of existing inventoried chillers and new chillers to be installed or inventoried. (maximum of 5,000 gpd of noncontact cooling water) Monitoring Location Description: From flow equalization tank outfall pipe located in the sanitary sewer manhole Discharge is to: The Town of Groton Water Pollution Control Facility

Table Remark:

In accordance with Table 5B-3, this discharge, at the authorized Total Maximum Daily Flow, does not have a prescribed monitoring frequency, unless otherwise directed by the POTW Authority, but must comply with the effluent limits and conditions of Section 5B(a) of the SIU GP. The permittee shall maintain records of monitoring data representative of the current discharge to assure compliance. All monitoring shall be done in accordance with the requirements of Section 5B(b) of the SIU GP. For cases where the Permittee uses data from a single discharge location to represent multiple discharges across the site, the Permittee shall stagger the periodic compliance monitoring across other representative locations in their compliance monitoring plan.

TABLE F - NetDMR Reporting Not Required Discharge Serial Number: 206-1 Monitoring Location: 1 Wastewater Description: Discharge of not more than 500 gpd of air compressor condensate from locations throughout SUBASENLON (maximum of 500 gpd of air compressor condensate) Monitoring Location Description: Condensate drain piping (multiple locations throughout SUBASENLON) Discharge is to: The Town of Groton Water Pollution Control Facility

Table Remark:

In accordance with Table 5B-3, this discharge, at the authorized Total Maximum Daily Flow, does not have a prescribed monitoring frequency, unless otherwise directed by the POTW Authority, but must comply with the effluent limits and conditions of Section 5B(a) of the SIU GP. The permittee shall maintain records of monitoring data representative of the current discharge to assure compliance. All monitoring shall be done in accordance with the requirements of Section 5B(b) of the SIU GP. For cases where the Permittee uses data from a single discharge location to represent multiple discharges across the site, the Permittee shall stagger the periodic compliance monitoring across other representative locations in their compliance monitoring plan.

Permit No. CTSIU0026 10

TABLE G - NetDMR Reporting Not Required Discharge Serial Number: 207-1 Monitoring Location: 1 Wastewater Description: Vehicle Maintenance Wastewater from Building 107 (South)-Fire Department, Building 460-Auto Hobby Shop, and Building 611-MWR POV Wash Rack (maximum of 3,200 gpd of vehicle maintenance wastewater) Monitoring Location Description: Oil/water separator outlet piping Discharge is to: The Town of Groton Water Pollution Control Facility

Table Remark:

In accordance with the requirements of Section 5B(b)(2) of the SIU GP, this discharge is exempt from all monitoring requirements, unless otherwise directed by the POTW Authority, provided that the discharge is in compliance with the effluent limits in Section 5B(a) of the SIU GP. The Permittee shall maintain records of any monitoring data representative of the current discharge to assure compliance. For cases where the Permittee uses data from a single discharge location to represent multiple discharges across the site, the Permittee shall stagger the periodic compliance monitoring across other representative locations in their compliance monitoring plan.

TABLE H - NetDMR Reporting Not Required Discharge Serial Number: 208-1 Monitoring Location: 1 Wastewater Description: Water Quality Analysis Wastewater (maximum of 5 gpd of other non-process wastewater) Monitoring Location Description: Discharge sinks Discharge is to: The Town of Groton Water Pollution Control Facility

Table Remark:

In accordance with Table 5B-3, this discharge, at the authorized Total Maximum Daily Flow, does not have a prescribed monitoring frequency, unless otherwise directed by the POTW Authority, but must comply with the effluent limits and conditions of Section 5B(a) of the SIU GP. The permittee shall maintain records of monitoring data representative of the current discharge to assure compliance. All monitoring shall be done in accordance with the requirements of Section 5B(b) of the SIU GP. For cases where the Permittee uses data from a single discharge location to represent multiple discharges across the site, the Permittee shall stagger the periodic compliance monitoring across other representative locations in their compliance monitoring plan.

Permit No. CTSIU0026 11

TABLE I - NetDMR Reporting Not Required Discharge Serial Number: 209-1 Monitoring Location: 1 Wastewater Description: A maximum of 50 gpd (estimated) of food processing wastewater from the cleaning of refrigerated box trailers at Building 175 (maximum of 50 gpd of food processing wastewater) Monitoring Location Description: Exterior wash tray drain pipes Discharge is to: The Town of Groton Water Pollution Control Facility

Table Remarks:

The drain diaper shall be inspected and maintained at all times in accordance with manufacturer specifications.

In accordance with Table 5B-3, this discharge, at the authorized Total Maximum Daily Flow, does not have a prescribed monitoring frequency, unless otherwise directed by the POTW Authority, but must comply with the effluent limits and conditions of Section 5B(a) of the SIU GP. The permittee shall maintain records of monitoring data representative of the current discharge to assure compliance. All monitoring shall be done in accordance with the requirements of Section 5B(b) of the SIU GP.

TABLE J - NetDMR Reporting Not Required Discharge Serial Number: 210-1 Monitoring Location: 1 Wastewater Description: Up to 999 gpd of Hydrostatic Pressure Testing Wastewater from the testing chamber drain at Building 478 and other locations at SUBASENLON (maximum of 999 gpd of hydrostatic pressure testing wastewater) Monitoring Location Description: From the sample port located in a pipe to the sewer line Discharge is to: The Town of Groton Water Pollution Control Facility

Table Remark:

In accordance with Table 5B-3, this discharge, at the authorized Total Maximum Daily Flow, does not have a prescribed monitoring frequency, unless otherwise directed by the POTW Authority, but must comply with the effluent limits and conditions of Section 5B(a) of the SIU GP. The permittee shall maintain records of monitoring data representative of the current discharge to assure compliance. All monitoring shall be done in accordance with the requirements of Section 5B(b) of the SIU GP.

Permit No. CTSIU0026 12

Table K - NetDMR Reporting Not Required

Discharge Serial Number: 211-1 Monitoring Location: 1 Wastewater Description: Pretreated stormwater from the truck loading/off-loading area at building 549 and the above-ground storage tanks (AST) containment area, groundwater infiltration, tank bottom condensate water from petroleum storage tanks, and Diesel Fuel Marine (DFM) stormwater containment area from B549 (maximum of 9,500 gpd of other non-process wastewater) Monitoring Location Description: From flow equalization tank outfall pipe located in the sanitary sewer manhole

Discharge is to: The Town of Groton Water Pollution Control Facility

PARAMETER UNITS

FLOW/TIME BASED MONITORING INSTANTANEOUS MONITORING

Average Daily Limit

Maximum Daily Limit

Sample/Reporting Frequency

Sample Type or Measurement to be Reported

Instantaneous Limit or Required Range

Sample/ Reporting Frequency

Sample Type or Measurement to be Reported

Flow, average daily1 gpd ---- NA Daily Total Daily Flow NA NR NA Flow, maximum daily1 gpd NA 9,500 Daily Total Daily Flow NA NR NA

Flow, day of sampling gpd NA 9,500 Annually Total Daily Flow NA NR NA

Total Petroleum Hydrocarbons 2 mg/l NA NA NR NA 100.0 Annually Grab pH, day of sampling S.U. NA NA NR NA 5.0 – 12.0 Annually Grab

Table Footnotes:

1 For this parameter, the Permittee shall maintain at the facility a record of the Total Daily Flow for each day of discharge and shall report either the Average Daily Flow and the Maximum Daily Flow for each sampling month or Flow Day of Sampling as applicable.

2 Analysis shall be performed using test methods approved by the most recent publication of 40 CFR 136 and reported as Total Petroleum Hydrocarbons.

Permit No. CTSIU0026 13

TABLE L - NetDMR Reporting Not Required Discharge Serial Number: 212-1 Monitoring Location: 1 Wastewater Description: Utility trench dewatering wastewaters composed of stormwater, groundwater, steam condensate and pipe condensate (maximum of 15,000 gpd of other non-process wastewater) Monitoring Location Description: Building 29 North trench (L-10) sump discharge to the sanitary sewer Discharge is to: The Town of Groton Water Pollution Control Facility

Table Remark:

In accordance with Table 5B-3, this discharge, at the authorized Total Maximum Daily Flow, does not have a prescribed monitoring frequency, unless otherwise directed by the POTW Authority, but must comply with the effluent limits and conditions of Section 5B(a) of the SIU GP. The permittee shall maintain records of monitoring data representative of the current discharge to assure compliance. All monitoring shall be done in accordance with the requirements of Section 5B(b) of the SIU GP.

TABLE M - NetDMR Reporting Not Required Discharge Serial Number: 213-1 Monitoring Location: 1 Wastewater Description: Decanted stormwater generated from catch basin cleaning conducted at catch basins throughout SUBASENLON. (maximum of 999 gpd of other non-process wastewater) Monitoring Location Description: Vacuum truck drain to sanitary sewer manholes at U.S. Naval Submarine Base- New London Discharge is to: The Town of Groton Water Pollution Control Facility

PARAMETER UNITS

FLOW/TIME BASED MONITORING INSTANTANEOUS MONITORING

Average Monthly Limit

Maximum Daily Limit

Sample/Reporting Frequency

Sample Type or Measurement to be reported

Instantaneous limit or required range

Sample/ Reporting Frequency

Sample Type or measurement to be reported

Flow, Day of sampling gpd NA 999 Annually Daily Flow NA NR NA Total Petroleum Hydrocarbons4 mg/l NA NA NR NA 100 Annually Grab pH, Day of sampling S.U. NA NA NR NA 5.0 – 12.0 Annually Grab Zinc, Total mg/l NA NA NR NA 2.0 Annually Grab Table Footnotes:

1 Analysis shall be performed using test methods approved by the most recent publication of 40 CFR 136 and reported as Total Petroleum Hydrocarbons.

Permit No. CTSIU0026 14

TABLE N - NetDMR Reporting Not Required Discharge Serial Number: 214-1 Monitoring Location: 1 Wastewater Description: Wastewater from the washing of small boats, washing of miscellaneous pieces of non-oily marine equipment, and waters generated from the testing of marine engines

(maximum of 999 gpd of other non-process wastewater

Monitoring Location Description: Wash Rack Separator Drain Pipe. Identified as at Building 615 Discharge is to: The Town of Groton Water Pollution Control Facility

Table Remarks:

Prior to washing, all equipment shall be inspected for evidence of excessive loose paint or oil. Gross solids shall be manually collected prior to washing. Oily water shall be isolated and collected for off-site disposal or management through DSN 204 of this Approval.

The stormwater diversion valve shall remain closed to isolate the wash rack from discharge to stormwater at all times that pressure washing occurs until the wash rack area is inspected and documented as free from debris or oil from pressure washing activities and detergent residues are fully rinsed to DSN 214-1.

In accordance with Table 5B-3, this discharge, at the authorized Total Maximum Daily Flow, does not have a prescribed monitoring frequency, unless otherwise directed by the POTW Authority, but must comply with the effluent limits and conditions of Section 5B(a) of the SIU GP. The permittee shall maintain records of monitoring data representative of the current discharge to assure compliance. All monitoring shall be done in accordance with the requirements of Section 5B(b) of the SIU GP.

Permit No. CTSIU0026 15

TABLE O - NetDMR Reporting Not Required

Discharge Serial Number: 215-1 Monitoring Location: 1 Wastewater Description: Boiler blowdown and wastewater and steam condensate at Building 29 (maximum of 30,000 gpd of boiler blowdown wastewater)5

Monitoring Location Description: Boiler blowdown drain(s)1

Discharge is to: The Town of Groton Water Pollution Control Facility

PARAMETER

UNITS

FLOW/TIME BASED MONITORING

INSTANTANEOUS MONITORING

Average Monthly Limit

Maximum Daily Limit

Sample/Reporting Frequency

Sample Type or Measurement to be reported

Instantaneous limit or required range

Sample/ Reporting Frequency

Sample Type or measurement to be reported

Copper, Total mg/l NA NA NR NA 2.0 Quarterly Grab Flow, Day of sampling2 gpd NA 30,000 Quarterly Total Daily Flow NA NR NA Lead, Total mg/l NA NA NR NA 0.5 Quarterly Grab Total Petroleum Hydrocarbons 3 mg/l NA NA NR NA 100 Quarterly Grab pH, Day of sampling S.U. NA NA NR NA 5.0 – 12.0 Quarterly Grab Solids, total suspended mg/l NA NA NR NA 600.0 Quarterly Grab Temperature4 ⁰C NA NA NR NA ---- Quarterly Grab Zinc, Total mg/l NA NA NR NA 2.0 Quarterly Grab Table Footnotes:

1 A representative sample collected from one (1) boiler, selected randomly, may be used to satisfy each quarterly sampling event. Each boiler must be sampled at least once every 3 years

2 Method of maximum flow determination for the registration was a calculation based on steam load and water intake. The flow will always be assumed to be the maximum of 30,000 gpd.

3 Analysis shall be performed using test methods approved by the most recent publication of 40 CFR 136 and reported as Total Petroleum Hydrocarbons.

4 Wastewater discharged under the authority of this general permit shall not contain heat in amounts which will inhibit biological activity in the POTW, but in no case heat in such quantities that the influent temperature at the POTW exceeds 104⁰F (40⁰C).

5 Occasionally, heat exchangers base-wide might require temporary draining to nearest floor drain for maintenance or replacement.

Permit No. CTSIU0026 16

TABLE P - NetDMR Reporting Not Required

Discharge Serial Number: 216-1 Monitoring Location: 1 Wastewater Description: Boiler blowdown from boilers used to heat specific buildings throughout the U.S. Naval Submarine Base- New London (maximum of 999 gpd of boiler blowdown wastewater) Monitoring Location Description: Boiler blowdown drain(s) Discharge is to: The Town of Groton Water Pollution Control Facility

Table Remark:

In accordance with Table 5B-3, this discharge, at the authorized Total Maximum Daily Flow, does not have a prescribed monitoring frequency, unless otherwise directed by the POTW Authority, but must comply with the effluent limits and conditions of Section 5B(a) of the SIU GP. The permittee shall maintain records of monitoring data representative of the current discharge to assure compliance. All monitoring shall be done in accordance with the requirements of Section 5B(b) of the SIU GP. For cases where the Permittee uses data from a single discharge location to represent multiple discharges across the site, the Permittee shall stagger the periodic compliance monitoring across other representative locations in their compliance monitoring plan

Table Q — NetDMR Reporting Not Required Discharge Serial Number: 217-1 Monitoring Location: 1 Wastewater Description: Parts Cleaning Wastewaters from Ultrasonic and Pressurized Water Parts Cleaning Machines in Building 88 (maximum of 302 gpd of tumbling or cleaning of parts wastewater) Monitoring Location Description: Parts cleaner tank drain Discharge is to: Town of Groton Water Pollution Control Facility

Table Remark:

In accordance with Table 5B-3, this discharge, at the authorized Total Maximum Daily Flow, does not have a prescribed monitoring frequency, unless otherwise directed by the POTW Authority, but must comply with the effluent limits and conditions of Section 5B(a) of the SIU GP. The permittee shall maintain records of monitoring data representative of the current discharge to assure compliance. All monitoring shall be done in accordance with the requirements of Section 5B(b) of the SIU GP.

Permit No. CTSIU0026 17

TABLE R – NetDMR Reporting Not Required

Discharge Serial Number: 218-1 Monitoring Location: 1 Wastewater Description: Cooling tower blowdown from multiple buildings, including but not limited to Nos. 439, 449, 455, 474, 488, 492, 499, 518, 519, 533 (2 units), and 560. (maximum of 9,500 gpd of noncontact cooling water) Monitoring Location Description: Cooling tower blowdown Discharge is to: The Town of Groton Water Pollution Control Facility

Table Remark:

In accordance with Table 5B-3, this discharge, at the authorized Total Maximum Daily Flow, does not have a prescribed monitoring frequency, unless otherwise directed by the POTW Authority, but must comply with the effluent limits and conditions of Section 5B(a) of the SIU GP. The permittee shall maintain records of monitoring data representative of the current discharge to assure compliance. All monitoring shall be done in accordance with the requirements of Section 5B(b) of the SIU GP. For cases where the Permittee uses data from a single discharge location to represent multiple discharges across the site, the Permittee shall stagger the periodic compliance monitoring across other representative locations in their compliance monitoring plan.

TABLE S - NetDMR Reporting Not Required Discharge Serial Number: 219-1 Monitoring Location: 1 Wastewater Description: Swimming Pool Wastewaters from Buildings 120 (Recreational Pool), 141 (Research Test Pool), 465 (Damage Control Trainer) and 592 (Escape Trainer); max 150,000 gpd pool draining wastewater, which includes a max 7,000 gpd filter backwash wastewater (maximum of 150,000 gpd of swimming pool wastewater) Monitoring Location Description: Composite of Swimming Pool Drains Discharge is to: The Town of Groton Water Pollution Control Facility

Table Remark:

Groton POTW must be notified before complete draining of pool to coordinate timing of the discharge.

In accordance with the requirements of Section 5B(b)(2) of the SIU GP, this discharge is exempt from all monitoring requirements, unless otherwise directed by the POTW Authority, provided that the discharge is in compliance with the effluent limits in Section 5B(a) of the SIU GP. The Permittee shall maintain records of any monitoring data representative of the current discharge to assure compliance. For cases where the Permittee uses data from a single discharge location to represent multiple discharges across the site, the Permittee shall stagger the periodic compliance monitoring across other representative locations in their compliance monitoring plan.

Permit No. CTSIU0026 18

TABLE T - NetDMR Reporting Not Required

Discharge Serial Number: 220-1 Monitoring Location: 1

Wastewater Description: Fire suppression system testing wastewater generated from multiple buildings at SUBASENLON (maximum of 12,500 gpd of fire suppression system testing wastewater) Monitoring Location Description: Fire suppression testing drain pipes Discharge is to: The Town of Groton Water Pollution Control Facility

Table Remark:

In accordance with the requirements of Section 5B(b)(2) of the SIU GP, this discharge is exempt from all monitoring requirements, unless otherwise directed by the POTW Authority, provided that the discharge is in compliance with the effluent limits in Section 5B(a) of the SIU GP. The Permittee shall maintain records of any monitoring data representative of the current discharge to assure compliance. For cases where the Permittee uses data from a single discharge location to represent multiple discharges across the site, the Permittee shall stagger the periodic compliance monitoring across other representative locations in their compliance monitoring plan.

TABLE U - NetDMR Reporting Not Required Discharge Serial Number: 221-1 Monitoring Location: 1 Wastewater Description: Building maintenance wastewater generated from multiple buildings at SUBASENLON (maximum of 5,000 gpd of non-process building maintenance wastewater) Monitoring Location Description: Building floor drains or sanitary manhole Discharge is to: The Town of Groton Water Pollution Control Facility

Table Remark:

In accordance with the requirements of Section 5B(b)(2) of the SIU GP, this discharge is exempt from all monitoring requirements, unless otherwise directed by the POTW Authority, provided that the discharge is in compliance with the effluent limits in Section 5B(a) of the SIU GP. The Permittee shall maintain records of any monitoring data representative of the current discharge to assure compliance. For cases where the Permittee uses data from a single discharge location to represent multiple discharges across the site, the Permittee shall stagger the periodic compliance monitoring across other representative locations in their compliance monitoring plan.

Permit No. CTSIU0026 19

TABLE V - NetDMR Reporting Not Required Discharge Serial Number: 222-1 Monitoring Location: 1 Wastewater Description: Infiltrated groundwater and stormwater, potentially including condensate potable water generated from manholes, vaults, pits, sumps, and trenches at SUBASENLON (maximum of 9,999 gpd of other non-process wastewater Monitoring Location Description: Pump discharge piping (or direct grab sample from utility feature) Discharge is to: The Town of Groton Water Pollution Control Facility

Table Remark:

In accordance with Table 5B-3, this discharge, at the authorized Total Maximum Daily Flow, does not have a prescribed monitoring frequency, unless otherwise directed by the POTW Authority, but must comply with the effluent limits and conditions of Section 5B(a) of the SIU GP. The permittee shall maintain records of monitoring data representative of the current discharge to assure compliance. All monitoring shall be done in accordance with the requirements of Section 5B(b) of the SIU GP. For cases where the Permittee uses data from a single discharge location to represent multiple discharges across the site, the Permittee shall stagger the periodic compliance monitoring across other representative locations in

Permit No. CTSIU0026 20

TABLE W - NetDMR Reporting Required Discharge Serial Number: 223-1 Monitoring Location: 1 Wastewater Description: Water Treatment Wastewater from the Low Temperature Water Softener system (Building 29) (maximum of 20,000 gpd of water treatment wastewater)2

Monitoring Location Description: Low temperature softener discharge drain

Limit

Maximum Daily Limit

Sample/Reporting Frequency

Sample Type or Measurement to be reported

Instantaneous limit or required range

Sample/ Reporting Frequency

Sample Type or measurement to be reported

Copper, Total mg/l NA NA NR NA 2.0 Monthly Grab

Flow, Maximum daily1 gpd NA 20,000 Daily/Monthly Total Daily Flow NA NR NA Flow, Day of sampling gpd NA 20,000 Monthly Total Daily Flow NA NR NA Lead, Total mg/l NA NA NR NA 0.5 Monthly Grab pH, Day of sampling S.U. NA NA NR NA 5.0 – 12.0 Monthly Grab Solids, total suspended mg/l NA NA NR NA ---- Monthly Grab

Zinc, Total mg/l NA NA NR NA 2.0 Monthly Grab

Table Footnote:

1 For this parameter, the Permittee shall maintain at the facility a record of the Total Daily Flow for each day of discharge and shall report the Maximum Daily Flow for each sampling month.

2 Low Temperature Water Softener regeneration discharge from this DSN can be transported to DSN 204-1 (OWTF) until equalization tank can be installed at this DSN.

Remark:

In accordance with section 5B(b)(7)(B)(ii) of the SIU GP, grab samples will be required for this DSN because the discharge lasts less than four hours.

Permit No. CTSIU0026 21

TABLE X - NetDMR Reporting Required Discharge Serial Number: 224-1 Monitoring Location: 1 Wastewater Description: Reverse osmosis reject wastewater generated at the Building 29 power plant (maximum of 72,000 gpd of reverse osmosis reject water) Monitoring Location Description: Reverse osmosis drain

Limit

Maximum Daily Limit

Sample/Reporting Frequency

Sample Type or Measurement to be reported

Instantaneous limit or required range

Sample/ Reporting Frequency

Sample Type or measurement to be reported

Flow, Average daily1 gpd --- NA Daily/Quarterly Total Daily Flow NA NR NA Flow, Maximum Daily1 gpd NA 72,000 Daily/Quarterly Total Daily Flow NA NR NA Flow, Day of sampling gpd NA 72,000 Quarterly Total Daily Flow NA NR NA pH, Day of sampling S.U. NA NA NR NA 5.0 – 12.0 Quarterly Grab Table Footnote:

1 For this parameter, the Permittee shall maintain at the facility a record of the Total Daily Flow for each day of discharge and shall report either the Average Daily Flow and the Maximum Daily Flow for each sampling month or Flow Day of Sampling as applicable.

TABLE Z - NetDMR Reporting Not Required Discharge Serial Number: 226-1 Monitoring Location: 1 Wastewater Description: Natural gas condensate generated from exhaust and heat exchangers from multiple buildings at SUBASENLON (maximum of 12,400 gpd of other non-process wastewater) Monitoring Location Description: Condensate discharge pipes

Discharge is to: The Town of Groton Water Pollution Control Facility Table Remark:

The variance request of 8 lbs/day for this discharge is granted for Nitrate-Nitrite (as N).

In accordance with Table 5B-3, this discharge, at the authorized Total Maximum Daily Flow, does not have a prescribed monitoring frequency, unless otherwise directed by the POTW Authority, but must comply with the effluent limits and conditions of Section 5B(a) of the SIU GP. The permittee shall maintain records of monitoring data representative of the current discharge to assure compliance. All monitoring shall be done in accordance with the requirements of Section 5B(b) of the SIU GP. For cases where the Permittee uses data from a single discharge location to represent multiple discharges across the site, the Permittee shall stagger the periodic compliance monitoring across other representative locations in

Permit No. CTSIU0026 22

TABLE AB - NetDMR Reporting Not Required Discharge Serial Number: 228-1 Monitoring Location: 1 Wastewater Description: Ice machine condenser cooling, condensate and miscellaneous drippings from ice machines from multiple buildings at SUBASENLON. (maximum of 9,000 gpd of noncontact cooling water) Monitoring Location Description: Ice machine drains Discharge is to: The Town of Groton Water Pollution Control Facility

Table Remark:

In accordance with Table 5B-3, this discharge, at the authorized Total Maximum Daily Flow, does not have a prescribed monitoring frequency, unless otherwise directed by the POTW Authority, but must comply with the effluent limits and conditions of Section 5B(a) of the SIU GP. The permittee shall maintain records of monitoring data representative of the current discharge to assure compliance. All monitoring shall be done in accordance with the requirements of Section 5B(b) of the SIU GP. For cases where the Permittee uses data from a single discharge location to represent multiple discharges across the site, the Permittee shall stagger the periodic compliance monitoring across other representative locations in

TABLE AA - NetDMR Reporting Required Discharge Serial Number: 227-1 Monitoring Location: 1 Wastewater Description: Building 29 Granular Activated Carbon water softener wastewater discharge (maximum of 4,800 gpd of water treatment wastewater) Monitoring Location Description: Activated Carbon system discharge drain

Limit

Maximum Daily Limit

Sample/Reporting Frequency

Sample Type or Measurement to be reported

Instantaneous limit or required range

Sample/ Reporting Frequency

Sample Type or measurement to be reported

Copper, Total mg/l NA NA NR NA 2.0 Quarterly Grab Flow, Maximum Daily1 gpd NA 4,800 Daily/Quarterly Total Daily Flow NA NR NA Flow, Day of sampling1 gpd NA 4,800 Quarterly Total Daily Flow NA NR NA Lead, Total mg/l NA NA NR NA 0.5 Quarterly Grab pH, Day of sampling S.U. NA NA NR NA 5.0 – 12.0 Quarterly Grab Solids, total suspended mg/l NA NA NR NA ---- Quarterly Grab Zinc, Total mg/l NA NA NR NA 2.0 Quarterly Grab Table Footnote:

1 For this parameter, the Permittee shall maintain at the facility a record of the Total Daily Flow for each day of discharge and shall report the Maximum Daily Flow and Flow Day of Sampling for each sampling month. Flow is based on engineering calculations and may be reported as a constant volume.

Permit No. CTSIU0026 23

TABLE AD - NetDMR Reporting Not Required Discharge Serial Number: 230-1 Monitoring Location: 1 Wastewater Description: Dental care wastewater from the Building 575 Dental Clinic (maximum of 990 gpd of other non-process wastewater) Monitoring Location Description: Not Applicable Discharge is to: The Town of Groton Water Pollution Control Facility

Table Remarks:

Dental Clinic discharges with the potential to contain mercury amalgam are not authorized by this approval, but are instead authorized based on the Permittee’s July 16, 2020 submittal of a certification form certifying compliance with Mercury Amalgam Best Management Practices for Dental Practices or Clinics January 11, 2006 revised version.

In accordance with Table 5B-3, this discharge, at the authorized Total Maximum Daily Flow, does not have a prescribed monitoring frequency, unless otherwise directed by the POTW Authority, but must comply with the effluent limits and conditions of Section 5B(a) of the SIU GP. The permittee shall maintain records of monitoring data representative of the current discharge to assure compliance. All monitoring shall be done in accordance with the requirements of Section 5B(b) of the SIU GP.

TABLE AC - NetDMR Reporting Not Required Discharge Serial Number: 229-1 Monitoring Location: 1 Wastewater Description: Health care related wastewaters from the Building 449 Health Clinic (maximum of 400 gpd of other non-process wastewater) Monitoring Location Description: Not Applicable Discharge is to: The Town of Groton Water Pollution Control Facility

Table Remark:

In accordance with Table 5B-3, this discharge, at the authorized Total Maximum Daily Flow, does not have a prescribed monitoring frequency, unless otherwise directed by the POTW Authority, but must comply with the effluent limits and conditions of Section 5B(a) of the SIU GP. The permittee shall maintain records of monitoring data representative of the current discharge to assure compliance. All monitoring shall be done in accordance with the requirements of Section 5B(b) of the SIU GP.

Permit No. CTSIU0026 24

TABLE AE - NetDMR Reporting Not Required Discharge Serial Number: 231-1 Monitoring Location: 1 Wastewater Description: Dental cutting and grinding wastewater from the Building 575 Dental Clinic dental mold and fabrication restoration operations (maximum of 12 gpd of cutting and grinding wastewater) Monitoring Location Description: Dental clinic room 118 grinding wheel drain Discharge is to: The Town of Groton Water Pollution Control Facility

Table Remarks:

The sediment trap shall be maintained at all times in accordance with manufacturer specifications.

In accordance with Table 5B-3, this discharge, at the authorized Total Maximum Daily Flow, does not have a prescribed monitoring frequency, unless otherwise directed by the POTW Authority, but must comply with the effluent limits and conditions of Section 5B(a) of the SIU GP. The permittee shall maintain records of monitoring data representative of the current discharge to assure compliance. All monitoring shall be done in accordance with the requirements of Section 5B(b) of the SIU GP.

Permit No. CTSIU0026 25

(D) Reporting Requirements. The results of chemical analyses required pursuant to the table(s) above shall be reported to the Water Permitting and Enforcement Division in accordance with Sections 5(c) and 5(d) of the SIU GP.

(E) Reporting and Notification to Local WPCAs. , In accordance with Sections 5(c)(2) and 5(d) of the SIU GP, DMRs and any notification made in accordance…