Conservation Commission Agenda (linked)

FIFTEEN ROPE FERRY ROAD WATERFORD, CT 06385-2886
PLANNING & DEVELOPMENT
Date: January 17, 2025
To: Brian Phillips, P.E., Langan Engineering
From: Maureen FitzGerald, Environmental Planner
Re: Inland Wetland Permit Application #C-25-02
441 Boston Post Road: Oswegatchie Fire Station
Application Review Comments
The application is for demolition of an existing fire station and associated paved parking area and the
construction of a new fire station building and associated parking areas, driveways and stormwater
treatment system on approximately 2.0 acres at 441 Boston Post Road. A portion of the proposed building
and new parking area, and demolition of a portion of the existing paved area occurs within the 100 ft.
upland review area of two wetlands areas. The proposed activity will impact approximately 16,000 sq. ft.
of the upland review area (URA) bordering wetland #1, an off-site intermittent channel, and 4,000 sq. feet
of the upland review area of wetland #2, a wetland swale located on the project property easterly of the
construction area.
Stormwater treatment mechanisms proposed include a dry grassed swale and a rain garden designed to
capture and treat the full water quality volume from the developed site before discharging to a level
spreader outlet.
Regulated activity associated with this proposal include:
1. Site demolition activity within the upland review area of inland wetlands.
2. Construction of a new fire station building and associated parking areas and stormwater
rain garden within the upland review area of inland wetlands.
3. Discharge of treated stormwater run-off from the developed site to upland area adjacent
to inland wetlands.
Application Comments:
1. Include the estimated duration of construction for each phase in the Construction Sequence narrative.
2. The Phase 1 construction sequence needs to identify when the rain garden is to be excavated and when
final stabilization, seeding and planting is scheduled to occur. Plan should identify temporary erosion
control measures to prevent sediment discharge until vegetation has established.
3. Plan notes and construction sequence should address whether the rain garden area serves as a
temporary sediment trap during the site demolition and construction period. The construction
sequence should include measures to remove accumulated fines from the basin substrate before
application of the designed rain garden substrate material and underdrain.
4. Provide inverts for the rain garden underdrain lines in the cross section detail.
5. Include a clean-out port for each line to allow inspection and maintenance.

6. The Phase 2 construction sequence needs to include final construction of the western grassed
conveyance swale and the timing of temporary and permanent soil stabilization measures to prevent
erosion and discharge of sediment to the rain garden.
7. The grading plan for the western swale includes grading off the property. Revise to incorporate and
maintain all grading and stormwater conveyances within the property boundary.
8. Include native shrub plantings within the southern end of the rain garden to provide a buffer between
the edge of pavement and the stormwater component. It is requested that additional native shrubs or
trees be planted within the proposed “sodded” portions of the upland review area to enhance the
wetland buffer.
9. Conservation Commission members requested that signs be posted at the north edge of the pavement
prohibiting dumping and discharge into the rain garden.
10. An as-built plan and written inspection report from the design engineer will be required to document
that the grassed swale and rain garden and level spreader controls were constructed in accordance with
the approved plans prior to issuance of a certificate of permit compliance.
Uo
Maureen FitzGerald
Environmental Planner