Final Environmental Impact Report - Whittier Bridge/I-95 ...

Whittier Bridge/I-95 Improvement Project FEIR
Chapter 1.0: Changes Since the Draft Environmental Impact Report and Resolution of Additional Issues
Salisbury Conservation Commission
Supplemental information provided to Salisbury included minor revisions to the stormwater
management system based on peer review comments, including the following revisions:
HydroCAD calculations for proposed conditions for Design Points, 4, 5, 6, 7, 8 and 9;
Drawdown calculations for Infiltration Basins 6 and 9;
Pre- vs. post-development runoff rates for Design Points 6 and 9;
The data log for test pit TP-11; and
A sketch showing the proposed Low Impact Development credits in the vicinity of Cains Brook.
In addition to the elimination of impacts to Wetland 1 as described on page 1-3, supplemental
information on potential wetland impacts in Salisbury was limited to clarification of wetland labels on
the NOI plans and the deletion of the proposed wetland mitigation area in Wetland O. No impacts to
wetland resources which are jurisdictional under the Wetlands Protection Act will occur in the Town
of Salisbury.
1.4.3 Wetlands Protection Measures During Construction
The DEIR Certificate requested that MassDOT ―…include details of the contractual and field
oversight measures that MassDOT will undertake to ensure protection of wetland resource areas.‖
MassDOT has committed to several measures that address concerns related to protection of
wetland resources along the project alignment during construction. First, MassDOT will clearly
delineate the limits of work areas in the field prior to the start of construction activities. Temporary
fencing will be installed adjacent to compost filter tubes in areas adjacent to wetlands in order to
demarcate the limit of work and protect wetland resources outside the limit of work. Permanent
fencing will be installed adjacent to the proposed retaining wall at Wetland I in Amesbury to delineate
the work area and control future maintenance access. Temporary signs will be installed along the
fence to indicate no work or alteration is allowed behind the fence. Notes have been included
throughout the NOI plans indicating that the contractor shall not work in, alter, or disturb any
unauthorized resource areas. The locations of the fencing have been included on the wetlands NOI
plans submitted to the conservation commissions, and the plans will become part of the construction
documents for the project. The contractor will be informed of the presence of the temporary fencing
during pre-construction briefings so that all contractor personnel are aware of the existence and
purpose of the fencing.
MassDOT‘s contractor will engage the services of a qualified environmental monitor who will report
to the MassDOT Resident Engineer during construction to monitor the progress of the work and
ensure compliance with environmental permit conditions and construction plans.
In Amesbury, because of the need to keep alterations of Bordering Vegetated Wetlands I and H
remain below the 5,000 square foot threshold beyond which a Variance from the Wetlands
Protection Act is required, a more permanent chain link fence will be installed to delineate the edge
of the work zone in the wetlands. No work or alterations will be allowed beyond the fencing. The
location of the chain link fencing is also indicated on the NOI plans and will become part of the
construction documents for the project.
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