To:
From:
Re:
B. Motion:
Attachment:
Discussion:
City of Nashua, Public Works Division
Board of Public Works Meeting Date: July 23, 2020
David L. Boucher, Superintendent
Wastewater Department
Energy Recovery Upgrade — Methuen Construction Change Order #7
To approve Change Order #7 to the Energy Recovery Upgrade contract with Methuen
Construction Company of Plaistow, NH in an amount not to exceed $39,315 for various
mechanical, instrumentation and electrical modifications to the energy recovery room.
Funding will be through: Department: 169- Wastewater; Fund: Wastewater; Activity:
Energy Recovery Upgrade Project.
Summary of PCO Items for Change Order #7
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 6 added $124,210.27 to the contract
value bringing the new contract amount to $1,911,588.27,
Change order #7 consists of 9 additional items from the contractor (PCO 18, 21, 22, 23,
25, 27, 28, 29 and 30. PCO’s 21, 22, 25 occurred as a result of generator supplier Milton
CAT requiring changes to construction after the project was bid. PCO 23 is an item
required by Eversource before electricity can be supplied back to the grid (after the
project was bid). PCO 18 and 24 occurred as a result of the Wastewater Plant changing
the location of the gas skid. PCO24 has been denied and is considered covered by
PCOO18. The remaining PCOs, 27, 28 and 29 are justified as these items that were not in
contract and/or unexpected field conditions encountered during construction. PCO30 is to
have the Contractor’s integrator provide SCADA setup for the new controls. Originally
that was going to be done in-house, but the electrician that was going to do the SCADA
setup no longer works for the City. Waldron has lowered the amounts requested in many
of these PCO’s for various reasons as described in the backup material. The new contract
value following approval of these change orders will be $1,950,903.27.
