To:
From:
Re:
F. Motion:
Discussion:
City of Nashua, Public Works Division
Board of Public Works Meeting Date: July 28, 2022
Daniel Hudson, P.E., City Engineer
Engineering Department
Canal St Bridge Repairs — Change Order No. 2
To approve Change Order No. 2 for the Canal St Bridge Construction Repairs
contract in an amount of $34,000. Funding will be through Departments 160
Admin/Engineering & 161 Street; Funds: Capital & Grant; Activities:
Infrastructure Improvements & Highway Block Grant.
The Canal Street Bridge over the Nashua River is part of a critical east-west arterial
roadway traversed by approximately 30,000 vehicles per day. NHDOT periodically
inspects the bridge and has given it a rating of poor for the substructure, due to
concrete issues at the east abutment and center pier. Repairs to a portion of the
bridge barrier are also necessary. Engineering consultant Fuss & O'Neill, contracted
by Engineering, provided the design of the repairs and is currently providing
construction services. New England Infrastructure, Inc. of Hudson, MA is
contracted for the construction repair work. A Notice to Proceed was issued for
work to start on June 16, 2022 and work is currently underway.
The original contract amount to New England Infrastructure was $373,750.
Following the start of construction, during low water conditions, we have observed
that the necessary repair areas have grown since their assessment at the time of
design. Concrete distresses in both the east abutment and center pier have increased.
In addition, a concrete sidewalk in proximity of the work has cracked and needs
replacement. A Change Order No. 1 for $23,561.86 was administratively approved
for the water diversion work necessary for the additional pier repairs and for the
sidewalk repairs.
This proposed Change Order No. 2 consists of three parts:
e Concrete preparation (removal of weak concrete): $12,000
e New concrete placement: $12,000
e Allowance for unforeseen repairs needed: $10,000
The allowance is being added due to some remaining uncertainty of full scope of
necessary repairs, which can only be fully investigated once the additional
dewatering is complete and the structure is fully visible. With Change Order No. 2
approval, the amended construction contract total will be $431,311.86. All work is
expected to be completed this year.
