HomeMy WebLinkAbout25SITE4 Boundaries Review Letter 4-26-25
John U. Faulise, Jr., L.S. David C. McKay, P.E.
Gerald J. Stefon, L.S. (1952-2021) Jacob S. Faulise, E.I.T.
Boundaries LLC
179 Pachaug River Drive
P.O. Box 184
Griswold, CT 06351
T 860.376.2006 | F 860.376.5899
www.boundariesllc.net
April 26, 2025
Ms. Meredith Badalucca
Assistant Planner
Department of Land Use & Development
Town of Montville
310 Norwich-New London Turnpike
Uncasville, CT 06382
Re: 25SITE4 – 393 Butlertown LLC
Map 005 Block 027 Lot 004, 393 Butlertown Road
Oakdale, CT
Site Plan and Stormwater Management Report Review
Dear Ms. Badalucca,
Per your request Boundaries, LLC. has completed a review of the site plans and stormwater management
report for the proposed warehouse/storage facility at 393 Butlertown Road prepared by Green Site
Design, LLC. This review is intended to evaluate compliance of the plan with the requirements of the
Town of Montville Zoning Regulations.
The following documents were received as part of the application package:
· Site Plan Application.
· Statement of Use.
· Drainage Report.
· Off-Season Equipment Storage, 393 Butlertown Road, Oakdale, CT, March 2025.
The following comments or questions are based on the above documents:
Application
· Please confirm the project address.
· The application indicates the project will be served by municipal sewer, please update.
Statement of Use
· Please update the reference to the applicable zoning regulation for the proposed use in the first
paragraph.
Page 2
Stormwater Modeling
· Please provide the reasoning behind the assumption that the stormwater basin will be dry
between the low-level outlet at elevation 235.5 and elevation 234. Based on the soil testing
results and NRCS soil maps of the site infiltration will likely be minimal, and the basin is below the
restrictive layer identified in Test Hole 101.
· The calculation of the water quality volume provided by the stormwater basin includes 4.5 feet
of storage above the low-level outlet. The water quality volume should be calculated using the
storage below the low-level outlet. Please update the calculation of the water quality storage
volume provided by the detention basin.
· Please evaluate the discharge velocities to confirm rip rap scour protection sizing.
Site Plans
· Please evaluate the available sight line from the proposed driveway to confirm the driveway
meets the requirements of the Town of Montville Road Standards 130B.8.
· Please confirm the proposed temporary sediment trap along the property frontages complies
with the terms of the existing utility easement.
· It appears that under existing conditions runoff from disturbed areas could flow off-site to the
northeast. Please review existing grades and add perimeter sediment barrier if runoff from
disturbed areas could flow onto the adjacent properties to the northeast.
· Please provide measures to protect the permanent stormwater basin from damage during
construction while being used as a temporary sediment trap.
· Please confirm the oil water separator will function as intended. Based on the elevations and the
modeled water surface elevations in the stormwater basin, the oil water separator will be
submerged during all storm events.
· Please update the configuration of the oil water separator so it is off-line and only treats the water
quality flow per the Stormwater Quality Manual guidelines.
· Please review proposed grading around the stormwater basin. Per the proposed grades and the
peak water surface elevations presented in the stormwater model the basin could overflow
through the south corner.
· Please review the proposed grades of the catch basins in the front parking area and entrance
driveway. The tops of frames are below the low-level outlet from the stormwater basin and the
modeled water surface elevation during all storm events so runoff from the stormwater basin
could overflow through the catch basin tops.
· Please review proposed grading at the building entrance to ensure that adequate pitch is
maintained away from the doorway.
· Please incorporate a level spreader to the piped discharge from the stormwater basin sized per
Page 476 of the Stormwater Quality Manual to protect the Butlertown Road right-of-way from
concentrated point discharges.
· Please incorporate a fence around the stormwater basin due to its depth, side slopes and likely
presence of a permanent pool of water.
· The proposed drain is located within 25 feet of the proposed well and does not comply with the
required separating distances. Please review the route of the proposed drain or the well location.
· Please update Erosion & Sedimentation Control Note 11, it is incomplete.
Page 3
· Please review the proposed grass seed mix and confirm it is suitable for maintained lawns, 2H:1V
slopes, and the stormwater basin per the Permanent Seeding section of the CT Guidelines for Soil
Erosion & Sediment Control.
· Please coordinate the proposed asphalt thickness between the Bituminous Concrete Drives and
Bituminous Concrete Pavement & Lip Curbing details.
Please do not hesitate to contact me with any questions.
Sincerely,
David C. McKay, P.E.