2021-03-12 NOI Update - 1087 Westhampton Rd
4 Allen Place, Northampton, MA 01060 (413) 582-7000 bdg@berkshiredesign.com
Berkshire
Design
Group
March 22, 2021
Northampton Conservation Commission
City Hall, 210 Main Street, 2nd Floor
Northampton, MA 01060
RE: 1087 Westhampton Road – NOI Revision
MassDEP File Number: WE246-0735
Dear Commissioners,
Berkshire Design Group, on behalf of the owner of 1087 Westhampton Road, respectfully submits this updated
Notice of Intent plan for the above-reference project. This letter summarizes the plan updates since your
previous review of the site design prepared by Jim Gracia, PE, in 2020.This plan update reflects additional
stormwater management infrastructure to ensure the project complies with the Northampton Stormwater
Regulations, and the Massachusetts Stormwater Standards.
The project is the construction of an 875 linear feet driveway and single-family home on a wooded 17.5 acre lot.
From Westhampton Road, the driveway follows the eastern lot line for approximately 400’ and then slopes up
to the house site. The site includes bordering vegetated wetlands to the east and west of the proposed
driveway. The first 400’ of the driveway are located within the 50-100’ buffer of the wetlands. The design of the
driveway and stormwater improvements has been modified from previous submittals to meet the Northampton
Stormwater Management regulations. The design is based on a hydraulic analysis of the site and overall
contributing drainage areas and on-site soil evaluation and test pits to establish locations for infiltration and
water quality facilities.
Plan changes include:
· Deletion of stone lined stormwater basins/settling pools
· Addition of one rain garden and three small infiltration pools in the upper portion of the site
· Addition of an infiltration basin near the site entrance
· Addition of a wet swale west of the driveway for the first 350 ft providing water quality treatment
· Addition of a level spreader is proposed west of station 4+00 on the driveway to convey flows from
uphill drainage areas into the wetland via sheet flow
Note that all plan changes are related to the enhanced stormwater management plan. The extent of the
proposed driveway remains the same as shown in previous submissions.
The stormwater analysis was completed encompassing the overall drainage area to the west and estimating the
impact of the existing detention pond and tributary development. A stormwater permit was issued by the
Northampton DPW on 3/11/2021.
Sincerely,
Berkshire Design Group
Chris Chamberland, P.E.
Principal Civil Engineer
4 Allen Place, Northampton, MA 01060 (413) 582-7000 bdg@berkshiredesign.com
Berkshire
Design
Group
March 22, 2021
Northampton Conservation Commission
City Hall, 210 Main Street, 2nd Floor
Northampton, MA 01060
RE: Request for Amended Order of Conditions Under 310 CMR 10.00
1087 Westhampton Road
MassDEP File Number: WE246-0735
Dear Commissioners:
On behalf of the property owner, Berkshire Design Group has submitted revised plans for a proposed single-
family house and driveway at 1087 Westhampton Road in a separate letter dated 3/22/2021. This letter
requests that the Commission determine whether an Amended Order of Conditions is necessary and, if so, to
issue an Amended Order.
The Commission has previously granted an Order of Conditions for this project under the Massachusetts
Wetlands Protection Act regulations but denied an Order under the Northampton wetlands ordinance.
Condition #34 of the Commission’s Order (dated 5/28/2020), the project was required to obtain a Northampton
Stormwater Permit. The revised plans incorporate the minimum work necessary to provide a stormwater design
that meets the standards of the Northampton Stormwater Ordinance and the MADEP Stormwater Standards.
The plan changes include:
· Deletion of stone lined stormwater basins/settling pools
· Addition of one rain garden and three small infiltration pools in the upper portion of the site
· Addition of an infiltration basin near the site entrance
· Addition of a wet swale west of the driveway for the first 350 ft providing water quality treatment
· Addition of a level spreader is proposed west of station 4+00 on the driveway to convey flows from
uphill drainage areas into the wetland via sheet flow
It is our opinion that the revised plans can be accepted by the Commission under Condition #34. However, if the
Commission determines that the proposed changes would require an Amended Order of Conditions, this letter
respectfully requests that the Commission issue an Amended Order to allow construction under the
Massachusetts Westland Protection Act regulations in accordance with the revised plans.
Sincerely,
Berkshire Design Group
Christopher Chamberland, P.E.
Principal Civil Engineer