To:
From:
Re:
D. Motion:
Attachments:
Discussion:
City of Nashua, Public Works Division
Board of Public Works Meeting Date: July 27, 2017
Noelle Osborne, Plant Operations Supervisor
Wastewater Department
Headworks Upgrade Project
To approve change order 5 to the Headworks Upgrades contract with T-Buck
Construction, Inc. in the amount of $17,452.98. Funding will be through:
Department: 169 Wastewater; Fund: SRF Loan; Activity: Headworks Upgrades.
Change Order 5 Backup
The contract with TBuck for the Headworks Upgrades at the Wastewater
Treatment Facility was originally for $2,848,222.00. Previous change orders in
the amount of $91,120.11 brings the current contract value to $2,939,342.11. Past
change orders included new lockers for the men’s locker room, relocation of pipes
and ducts due to conflicts, changing out electric circuits that were found to be
deficient, and the addition of several new ceiling mounted heaters.
When wastewater enters the headworks area it splits into 2 channels, referred to as
the short and long channel. This change order is for extra work necessary to have
the new screen fit within the short channel width by increasing the cutouts in the
channel walls. It was not possible for the consultant to accurately measure the
concrete cutouts in the existing channel during the design phase, as there is
continuous wastewater flow entering the plant and the bottom portion of the
existing screen remained submerged. When flow was blocked from entering the
short channel, it was determined that the existing cutouts along the concrete walls
would not allow the new screen to fit properly. This change order is for the
additional saw cutting needed so that the new screen would fit within the existing
concrete channel. This same situation will occur when the contractor demolishes
the long channel; however it is premature to determine the additional costs until
they begin the work and assess the needs.
The change order work scope and costs has been reviewed and approved by the
consultant Wright Pierce. The total amount of this change order comes to
$17,452.98. The new value of their contract following this change order will be in
the amount of $2,956,795.09.
This project is an SRF funded project and the City will be seeking a State Aid
Grant (SAG) in the amount of 20% of the costs should such funding become
available.
