e Renaissance Park Redevelopment - The redevelopment of the park will likely include
rehabilitation and/or replacement of existing walls and banks that retain the park along
the Nashua River.
Because the project will be implemented in phases, we understand that the regulatory process
may proceed in phases accordingly. Additionally, VHB understands that the project will require
excavation within areas of urban fill, and that areas of known contamination occur within or
adjacent to the project area. For this reason, VHB will provide an assessment of potential soil
and groundwater management issues as part of this scope.
Task 1. Prime Wetland Boundary Coordination
The existing prime wetlands mapping of the Nashua River is inaccurate in certain areas of the
project limits, extending substantially outside of the banks of the river in certain locations. To
clarify NHDES jurisdiction, and in keeping with NHDES guidance on this issue, VH8 will prepare @
submittal pursuant to Env-Wt 703.05 to clarify the boundary of the prime wetland. VHB will
prepare an overlay map of the official prime wetland boundary together with the field
delineation previously completed by our wetland scientists and will coordinate with the Nashua
Conservation Commission to obtain their concurrence with the revised mapping. This
information will be submitted to the NHDES Wetlands Bureau for review and approval prior to
completing the permit applications.
Task 2. Wetland Mitigation Support
Because the project will impact a prime wetland, NHDES will require compensatory mitigation.
VHB will therefore develop a project mitigation proposal, in consultation with the City, following
the criteria at Env-Wt 801.03. This effort would:
e Document that on-site mitigation is not practical, given the constraints of the existing
infrastructure and property boundaries.
e Evaluate whether the project can incorporate other forms of off-site permittee-
responsible mitigation such as creation, restoration, or preservation, in consultation with
the Nashua Conservation Commission.
e If needed, VHB will produce a high-level conceptual pian for a permittee-responsible
mitigation proposal. This plan would include information sufficient to allow for
preliminary NHDES review, but is not intended to include full mitigation design (e.g., the
documentation required by Env-Wt). This task assumes that NHDES would allow final
design of any such mitigation to occur following permit approval.
e If permittee-responsible mitigation is determined not practical, develop an analysis of in-
lieu fee mitigation.
