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Massachusetts Water Resources Authority
PROJECT UPDATE

Date:

Updated September 7, 2021

Contact:

Jeffrey McLaughlin
(617) 305-5762, Jeffrey.McLaughlin@mwra.com


Update for Nut Island Headworks Odor Control and HVAC Improvements Project (Contract 7548)

Exterior view of Odor Control roof and site

About this Project:

The Nut Island Headworks Odor Control and HVAC Systems Improvements project involves an extensive rehabilitation of the facility that will ensure that Nut Island continues to work as designed.  Odor Control facility access, fuel tank replacement and other appurtenances will be rehabilitated.  This project will take approximately 36 months to complete.  Walsh Construction will be performing this work in phases Monday through Friday between the hours of 7AM-3PM.
The first phase of work will begin on Tuesday, April 21, 2020.  The work involves the installation of erosion controls (silt fencing and straw waddles), catch basin inlet protection, tree protection, temporary chain link fence and concrete barriers delineating work zones.  The initial work will be followed by establishing a temporary construction laydown area.  Once these activities are complete, the next phase of work will begin in May at the Nut Island facility.

Public Access Plan

Public Access paths will remain open during construction.  Please obey all posted signage on site.

Exterior sluice gate area

MWRA Contact:

If you have any questions please email Jeff McLaughlin or call (617) 305-5762.

To receive electronic project updates, please register your email address with the MWRA Alerts Service, provided through Everbridge.

Updates 

September 7, 2021

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Temporary OC Duct (preliminary testing to test flow for changes)

Temporary Supply Air Fans

Emergency slide gate 3

Excavation for new underground storage tanks

August 6, 2021

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OC #4

Portable CAD Unit (ductwork outside)

Caustic Feed System

Boiler Replacement

April 27, 2021

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Fan 4 intake (suction) prior to installation of additional Odor Control Duct

Spare fan wheel

Exhaust from fan 4 as it enters the header

Odor control room (future hypochlorite location)

Sub-contractor prep work to get fan up and running

New stainless steel ducts in grit level

Stop log guide rail

March 31, 2021

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Odor Control Fan #4 set in place & grouting base frame

New Odor Control SCADA cabinet set in pump and blower room

New caustic tanks set in place

Chemical fill piping for sodium hypochlorite and sodium hydroxide

Temporary carbon absorber unit

HVAC duct work in screen room

Work at spillway, finishing grouting rails and planning stop logs

March 2, 2021

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Stop log frames being ins stalled in the emergency spillway

Stop log frames being ins stalled in the emergency spillway

90-inch odor control fan header installed

Forms for new odor control dan foundation

Caustic storage tanks delivered and stored on site

February 3, 2021

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Temporary Ductwork at grit level

Temporary duct system to provide ventilation while existing ductwork gets replaced

Temporary fans to provide ventilation while air handlers get replaced

Outdoor roof and removable covers and ductwork being delivered to site

New 90-inch Odor Control Header being rigged into place

New odor control fans being shop tested to confirm operation

December 14, 2020

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90-inch duct and dampers removed from odor control room

Sawcutting walls in Grit Room for temporary duct work

Temporary ductwork in Grit Room prior to replacing new ductwork

Sluice gates at emergency spillway that will be replaced

Portable operator to close spillway gates if power is lost.

October 29, 2020

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Demolition of sodium hypochlorite containment wall

Site of future sodium hydroxide (caustic) storage tanks and pumps

Ductwork from grit area to feed odor control room

Next month's work at emergency spillway stop logs and sluice gates

October 2, 2020

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Odor Control Roof with removable covers for equipment access to wet scrubbers and CAD-1

Temporary waterproofing at removable concrete planks on Odor Control Roof

Ductwork and heat exchanger below removable roof planks that will be demolished in Odor Control Room

Demolition of existing wet scrubber recirculation pumps

Electrical conduits installed in the Odor Control Room to power new equipment

June 16, 2020

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Contractor establishing work zone with concrete barriers, fences and screens at the Odor Control Roof

Contractor removing soil from Odor Control Roof

Location of new odor control fan that will replace the fan that was damaged in the 2016 fire

April 22, 2020

Project updates will be posted throughout the period of construction.


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