NEPA ENVIRONMENTAL CHECKLIST – SUBASENLON

NEW FORM EFFECTIVE 03/20/2025. The PWD Environmental Division (EV) uses this NEPA Environmental Checklist (EC) to determine the environmental requirements associated with a proposed project. Complete the first 2 pages of the form, attach a site map and a SOW or 1391, and then submit to EV. Submit the complete EC with required attachments a minimum of 15 days prior to a project’s scheduled start date. If there are modifications to the project scope or if work has not been initiated within 1 year of the signature date, please contact EV for review/approval prior to initiating the project.

GENERAL PROJECT INFORMATION

1 Activity Requesting: NAVFAC MIDLANT ROICC New London

2 Activity POC / Phone / email: John Papitto, 860-694-4914, john.a.papitto.civ@us.navy.mil

3 Name of Project: B141 Replace Emergency Diesel Generator

4 Project Number (if any): eProjects # 1904124

5 Project Location: NAVSUBASE NEW LONDON CT

6 Project Type: Design Bid Build

7 Description of the Project:

This project will replace the existing pad-mounted generator and associated above ground diesel fuel storage with a larger capacity to provide additional emergency power to the Genesis Chamber equipment. Additionally, new receptacles, connected to emergency power, will be provided for general use within the Genesis Chamber, as well as a duplex receptacle on the 2nd/3rd floor B156 connector corridor to support emergency power to a refrigerator. The emergency distribution will be upgraded including a new automatic transfer switch, emergency distribution panel, and transformer. Work includes removals and sealing of new penetrations through existing exterior walls, interior walls, floors, foundation walls, and ceilings. A portable trailer mounted generator will be provided to support operations during the construction period. The existing generator manufacturer was unable to confirm whether asbestos was used in the internal components, so it will be assumed to contain ACM. Lead paint was identified. No PCB-containing materials were identified. Work also includes removal of existing and provision of new ductbank, feeders and concrete pad.

8 Why is this project needed? The NSMRL’s Genesis Chamber has limited backup power to support the usage of equipment upon loss of normal power.

9 Date project scheduled to begin? FY27

PLANNING QUESTIONS

10a Total Project Area (sq. ft.) - (Include clear zones, soil disruption/disturbance area, lay down areas, etc)

Majority of work is bldg. interior. The exterior Project Area is 325 sf.

10b Percentage of Project Area - that is currently Impervious (asphalt, bldgs, etc.) 100%

10c Percentage of Project Area - that will be Impervious once project completed 100%

10d Percentage of Project Area - that will be disturbed (excavated, graded, etc) 70%

11 How will Stormwater be managed in the long-term (post-construction)? No change.

12 How will Sanitary Sewage (wastewater) be managed in the long-term? No change.

13 Will there be actions conducted in the water (dredging, new pilings, removal etc.)? If so indicate state what action(s). No.

14 Will there be actions conducted in an area under an Agriculture outlease? No.

DESIGN RELATED QUESTIONS YES NO UNSURE

15 Will trees be removed?

16 Will emission-generating equipment (e.g. bull dozer, back hoe, etc.) be utilized during construction? If yes, please list equipment. Backhoe, bobcat, forklift, flatbed, cement mixer.

Will the project remove, install or utilize a petroleum storage tank, that is >=55-gallons?

Remove existing 300 gal aboveground diesel fuel tank, and install new 2,050 gal aboveground diesel fuel tank.

18 Will the project remove or install an Oil Water Separator?

19 Will the project relocate excavated material at the Installation? If yes where is it going?

Will the construction / repair actions generate by-products (power washing water, haz. waste, state regulated waste such as asbestos, PCB items, transformers, capacitors, switches, light ballasts, lead paint chips, florescent bulbs, waste oil, solvents, etc)? If so indicate what type of waste(s) will be generated. Existing generator is assumed to contain internal ACM. Lead paint during demolition, i.e. existing generator enclosure, and interior wall penetrations.

21 Will the construction / repair actions require de-watering from excavations, trenches or manholes? If yes, circle where de-watering will occur?

DESIGN RELATED QUESTIONS YES NO UNSURE

22 Will there be new hard pipe connections or modifications to existing hard pipe connections using water from Groton Utilities, the Thames, or wells?

Will new hard pipe connections or modifications to existing hard pipe connections discharge wastewater to the sanitary sewer, storm sewer or the Thames River? If so circle discharge type.

24 Will there be UST or AST installation, modification, or removal? If so indicate which type of tank and which action. See response to #17 above.

25 Will there be installation, repair, modification or removal of any system containing refrigerants

(e. g. freon, halon)?

26 Will there be modifications, destruction, or disturbance of the shoreline, streams, groundwater tables, surface water bodies, or wetlands? If so, explain.

Will there be any excavation and/or dewatering with the potential to impact the designated CT Coastal Zone (i.e., 1,000 feet inland from the MHW line)? If so, what type of activity will occur that can potentially impact the coastal zone area?

28 New proposed use and/or application of pesticides, rodenticides and herbicides? If so, indicate which type.

29 Will the project require pile driving?

OPERATIONAL RELATED QUESTIONS YES NO UNSURE

30 Will emission-generating equipment be installed (ex. paint booth, emergency generators)? If so, what type of equipment will be installed? Emergency generator.

31 Will there be any new processes or maintenance activities conducted? If so, describe what they are. New Generator will need to be added to the generator maintenance service contract.

ADDITIONAL COMMENTS

Type here:

SAME 6/17/26

Checklist Preparer, phone number and e-mail (if Same as Question #2 – Type “SAME”) Date

NEPA ENVIRONMENTAL CHECKLIST – SUBASENLON

SUMMARY OF ENVIRONMENTAL REQUIREMENTS

(To Be Completed by Environmental Division Only) PLEASE NOTE: The Environmental review provided is only valid for 1 year. If the project scope has been modified or checklist has expired, please contact the SUBASENLON PW Environmental Division to re-evaluate the project.

Name of Project: B141 Replace Emergency Diesel Generator Project Number: eProjects # 1904124

PLANNING REQUIREMENTS (Issues That Can Effect the Project’s Timeline, Cost, or Site Location) Environmental Aspect YES NO Environmental Requirement Project Impacts

National Env Policy Act (NEPA) CATEX CATEX = 1-52+ weeks; EA = 12 months; EIS = 24 months

Can’t award till NEPA complete

Threatened or Endangered Species Consultation with USFWS and/or NMFS required. Process may take 6 months

Marine Mammal Protection Act IHA or LOA Consultation with NMFS May take 4 to 18 months

Wetland Impacts Permits and possibly mitigation required. May take 7 months after

NEPA

Navigable Water Impacts Permits required. Takes 2-7 months after

NEPA

Agriculture Outlease Consultations with NAVFAC Real Estate required. Process may take 1 to 3 months.

Tree Mitigation Compensation for tree loss or mitigation is required. This may add costs to project.

Coastal Zone Mgmt Act Coastal Consistency Determination (CCD) is required. Process takes 90 days.

Cultural Resources Consultations with SHPO required. See Requir 5. Process may take 1 to 6 months

Major Air Emission Source Permit is required. See Requir 2 & 3. Process takes 6 months

Construction Emissions Air Conformity Record of Non-Applicability is required. This process takes a week.

Installation Restoration Land-use controls exist or Consultation w/ EPA required Process may take 4 months

Petroleum Contamination Follow guidance in CNRMA POL SOP. This may add costs to project.

DESIGN REQUIREMENTS (Issues To Be Addressed In Design Phase) Storm Water Best Mgmt

Practices, Erosion & Sediment Control

Required for projects that include excavation or other land disturbance. See Requir 10 & 12. Incorporate into the design.

CT Storm Water Mgmt Permit Required for projects that will disturb ≥ 1 acre of land. Obtain before construction.

De-watering, Wastewater Mgmt Protective measures required for managing excess waters. Incorporate into the design.

Beach & Dune Management Protective measures required for impact beaches & dunes Incorporate into the design.

Spill Preventative Measures Secondary containment required for tanks ≥ 55 gal.

See Requirement #13 Incorporate into the design.

OPERATIONAL REQUIREMENTS (Issues To Be Addressed Prior To Use)

New Industrial Process Environmental Department Site Inspection required. Required before operation.

New Waste Generating Activity Environmental Department Site Inspection required. Required before operation.

ADDITIONAL REQUIREMENTS or COMMENTS Comment 1 The proposed action is within the scope of Department of Navy CATEX DoW A128-8: Routine repair and maintenance of buildings, facilities, vessels, aircraft, ranges, and equipment associated with existing operations and activities.

None of the exclusions from reliance on a CATEX applies in this case; therefore, the proposed action does not require further NEPA analysis. The applicability of this CATEX determination requires full implementation of all environmental requirements identified below.

Requir 1 Work shall comply with all Federal, State, and local environmental regulations as well as with all applicable Navy requirements. SUBASENLON PWD EV shall be the point of contact for all questions related to environmental rules or regulations.

Requir 2 Generators are required to have on file with the PWD EV Division an EPA-approved Tier III Emission Certification.

Generator use shall be done in accordance with the SUBASENLON Title V Permit. Contact the PWD EV Division Air Program Manager (860-694-5192) 30 days in advance of generator arrival at SUBASENLON to obtain specific compliance options and requirements. Generators shall meet all State and Federal regulations.

Requir 3 Information regarding any new emission sources, including boilers, generators, etc., shall be submitted to the PW NLON EV Division Air Program Manager (860-694-5192) prior to purchase. Permitting new emission sources, reporting, and/or monitoring requirements may apply.

Requir 4 No emissions of asbestos shall be generated in the execution of this project. Full compliance with the provisions of the federal Asbestos NESHAP is required, including proper management and disposal of all asbestos waste generated as a result of performing the prescribed work under this project. Abatement activity shall comply with CTDPH regulations.

Requir 5 Building 141 is eligible for listing on the National Register of Historic Places (NRHP). Any work activities in buildings eligible for listing on the National Register of Historic Places shall be subject to consultation with the State Historic Preservation Office (SHPO), which shall be coordinated through the PW NLON EV Division Cultural Resource Manager (860-694-5164). Work activities shall conform to the scope approved by the SHPO. Subsequent changes to the SOW shall require additional review by SHPO, which may delay the project for a minimum of 30 days. SHPO consultation submitted "7/15/2026" with a no adverse effect determination; concurrence received "8/4/2026".

Requir 6 A dig permit shall be obtained from and approved by the PWD prior to initiation of any ground-disturbing activities. Soil management procedures as detailed in the dig permit and the SUBASE Soil Management SOP shall be followed. Soil that cannot be returned to its original location may need to be disposed of off-base at the contractor's expense.

Groundwater may need to be containerized and disposed of off-site at the contractor’s expense.

Requir 7 Existing facility HAZMAT surveys shall be reviewed prior to any facility disturbance. If suspect hazardous materials (such as asbestos and lead paint) are present and are anticipated to be disturbed under the scope of the project, surveys shall be conducted by qualified individuals in advance of construction activity. All survey results shall be provided to the PW NLON EV Division in advance of start of construction.

Requir 8 All unused HAZMAT items shall be immediately removed from the work site and/or base at the time of project completion.

Requir 9 Management, storage, and disposal of any regulated waste shall be coordinated in advance with the PW NLON EV Division Hazardous Waste Program Office (860-694-4298).

- All regulated waste shall be manifested through the Hazardous Waste Program Office.

- Any regulated waste generated under the scope of this project shall be managed, stored, and disposed of in accordance with the SUBASENLON Hazardous Waste Management Plan and SUBASENLON policies and instructions.

- Non-regulated solid waste (i.e., general trash, construction debris, and recyclable items) shall be properly managed and disposed of in accordance with Federal, State, Navy, and local regulations.

Requir 10 Use of exterior storage and laydown areas in support of this project shall be done in compliance with SUBASENLON instructions and policies. Site must be evident of good housekeeping practices consistent with proper stormwater management and control.

Requir 11 Any surface paints that will be impacted by these actions shall be tested for the presence of lead or other metals prior to disturbance. All paint chips and particulate matter shall be captured and collected using tarps or plastic sheeting.

Management of all regulated waste generated as a result of these operations shall comply with the requirements of the SUBASENLON Hazardous Waste Management Plan.

Requir 12 Work shall be executed in full compliance with the provisions of the General Permit for the Discharge of Stormwater from Small Municipal Separate Storm Sewer Systems (MS4 Permit), the SUBASENLON Stormwater Pollution Prevention Plan, and the SUBASENLON Stormwater Management Plan. Appropriate erosion and sediment control measures shall be used when performing work under the scope of this project.

Requir 13 All storage tanks holding petroleum products, >55 gallons, must meet the requirements of 40 CFR 112, NFPA 20, 30, 30A, and 31. Final Tank specifications shall be provided to the PW NLON EV Division Tank Program Manager (860- 694-5159) and EPCRA Manager prior to installation.

Requir 14 The AST shall be double-walled with either an interstitial level gauge or interstitial liquid alarm. An isolation valve shall be installed near the tank along the fuel line that feeds the boiler/generator from the tank. A level gauge for the main tank that is visible from the fill port and an overfill valve on the fill port shall be installed.

Requir 15 PW NLON EV Division shall be notified immediately of any actions that require dewatering activities under the scope of this project, including drain-down of any water piping and equipment. Discharge to the stormwater system is prohibited. Permitted discharges to sanitary are allowed in accordance with the General Permit for the Discharge of Wastewaters from Significant Industrial Users (SIU GP). No discharge shall occur without prior approval from the PW NLON EV Division Wastewater Program Manager (860-694-2525).

Christopher Koproski, Installation Environmental Program Director; x3976; christopher.r.koproski.civ@us.navy.mil

8/19/26: PWO/ICO signature not required for this action. CATEX does not require a formal RCE per COMNAVREG MIDLANT Guidance for implementing CATEXs under NEPA, 27 AUG 2012.

Environmental POC; phone number and email Signature and Date mailto:christopher.r.koproski.civ@us.navy.mil