Segment 2 — Path and Riverbank Enhancements
2.1 TTG will perform additional river normal and flood analyses to evaluate the flood
resiliency of Tighe & Bond’s riverbank protection system(s) and modifications to the
park and boardwalk alignment to avoid conflicts with the Eversource substation.
Segment 3 — Substation Screening
3.1 TTG will perform final and structural design for the metal screening structure based
on Payette Architect’s March 6, 2022 design.
3.2 TTG will perform preliminary (recently completed) and final structural design for the
screening structure foundation. Prepare final engineering plans and specifications
for review and approval by the City.
Note: A new or revised foundation design different from the preliminary design is
required as Eversource is not in agreement with the TTG preliminary design.
3.3 TTG will perform additional river normal and flood analyses to evaluate fload
resiliency of Tighe & Bond's riverbank (cove) protection system(s).
Segment 4 — Boardwatk Connector
4,1 Perform river engineering analyses using the river model to determine scour, debris
and ice loading impacts for fload resiliency.
4.2 Perform structural design of the pile and pile foundation, the boardwalk/pile
connection, and other structural connections/detaiis.
43 Prepare final engineering plans and specifications for City review and approval.
Segment S — Multi-Use Path Connector
5.1 Evaluate the proposed riverbank protection system by VHB or others for the
potential of erosion and scour using the river hydraulic model to determine bank
velocities and soil shear.
Segment 6 — 53 Main Street Boardwalk
6.1 Redesign the walkway piles consistent with avoiding the siphon sewer facility and
geotech recommendations being sought as part of final engineering design.
Final Engineering Design Proposal 05-11-22 2
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TURNER
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