To:
From:
Re:
A. Motion:
Attachment:
Discussion:
City of Nashua, Public Works Division
Board of Public Works Meeting Date: April 23, 2020
David L. Boucher, Superintendent
Wastewater Department
Energy Recovery Upgrade — Methuen Construction Change Order #6
To approve Change Order #6 to the Energy Recovery Upgrade contract with Methuen
Construction Company of Plaistow, NH in an amount not to exceed $5,619.29 for
structural support modifications to the energy recovery room. Funding will be through:
Department: 169- Wastewater; Fund: Wastewater; Activity: Energy Recovery Upgrade
Project.
Change Order #6
The energy recovery upgrade project involves upgrading all the major components in the
energy recovery room with new generators, piping, heat exchangers, pumps, controls and
associated electrical components. The contract with Methuen Construction was originally
in the amount of $1,787,378. Change orders 1 thru 5 were for various modifications to
the original layout largely due to unforeseen building conflicts and/or additional items
(pumps, electrical sizing) required by the equipment manufacturer (Milton CAT) that
came after the project was bid and approved. The total of change orders 1-5 is
$118,590.98 with a new contract value of $1,905,968.98.
Change order 6 consists of 2 items. The first item (PCO015) is for supports for 2 ground
level heat exchangers. Normally a vendor supplied heat exchanger comes with supports
attached to it which can be fastened into a concrete pad. That was not the case and the
contractor has to fabricate and install supports in an amount of $3,372.53. The second
item (PCO016) 1s for supports to mount the jacket water pumps to the ceiling. The
contractor was informed by supplier Milton CAT after the work started that it would be
necessary to install the jacket water pumps. This was not part of the Contractor’s scope
and costs for this work is in an amount of $2,246.76.
