WASTEWATER TREATMENT PLANTSECONDARY CLARIFIER REPAIRS

Agency:	City of Manchester
State:	New Hampshire
Type of Government:	State & Local
NAICS Category:	221320 - Sewage Treatment Facilities 237110 - Water and Sewer Line and Related Structures Construction
Posted Date:	Mar 13, 2026
Due Date:	Apr 9, 2026
Solicitation No:	FY26-270-39
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Bid Documents:	Please Login to View Page

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Timothy J. Clougherty

Public Works Director

Owen P. Friend-Gray, P.E.

Deputy Public Works Director

Robert J. Robinson, P.E.

Chief Sanitation Engineer

CITY OF MANCHESTER

Department of Public Works

Environmental Protection Division

Commission

Kathleen Sullivan, Chair

Arthur Gatzoulis, Co-Chair

Mark MacKenzie

Amber Nicole Cannan

Andre Parent

INVITATION FOR PREQUALIFICATION OF GENERAL CONTRACTORS

WASTEWATER TREATMENT PLANT

SECONDARY CLARIFIER REPAIRS

The City of Manchester owns and operates a wastewater treatment plant (WWTP) that is a 34 MGD

activated sludge process. The WWTP treats an average of 24 million gallons per day and was originally

constructed in 1976 with major upgrades in 1993 and 2016. The WWTP has three (3) secondary clarifiers.

Two of the clarifiers are original equipment from 1976 and the third is from a large facility upgrade in

1991. All three secondary clarifiers were upgraded in 2010. The clarifiers, after 16 years in service, have

experienced failures of the carbon steel fasteners, hardware and structural members that need replacement.

The Clarifier #2 48-inch influent slide gate has failed and cannot be operated and needs to be replaced. The

other two influent clarifier gates will also be replaced under this project. Also, the secondary clarifier 48-

inch crossover pipe has no means of isolation and the City wishes for new fabricated steel plates to be

installed at either end to block the pipe off. All of the work associated with the slide gate replacements and

blocking off the crossover pipe will require significant bypass pumping effort to maintain continuous flow

through the plant. Lastly the City also requires the plant water system isolation 14-inch plug valves to be

replaced. The estimated construction cost of this work is $2.75 million and construction duration is 300

calendar days.

PREQUALIFICATION

General contractors with extensive experience in wastewater and/or water treatment projects of a similar

size and scope are invited to submit prequalification packages for bidding on the City of Manchester’s

Wastewater Treatment Plant Secondary Clarifier Repairs Project. Questions should be directed to the

City’s engineer Underwood Engineers, Inc. care of Steve Smith at (603) 230-9898 or

ssmith@underwoodengineers.com. Sealed Prequalification Statements will be received at the Underwood

Engineers Concord office until 4:00 PM EST on Thursday, April 9, 2026. Prequalification statements

shall be addressed as follows: Prequalification Statement, Attn: Steve Smith, Underwood Engineers, Inc.,

99 North State Street, Concord, New Hampshire 03301.

ONLY PREQUALIFIED FIRMS WILL BE ALLOWED TO BID. Project will bid in April 2026 with a

bid opening in May 2026, and a Notice to Proceed issued for work to begin in August 2026. The right is

reserved to waive any informalities in or reject any or all prequalifying Contractors and to accept

prequalified Contractors that are deemed most favorable to the interest of the City of Manchester.

City of Manchester, NH

Department of Public Works

Environmental Protection Division

300 Winston Street, Manchester, NH 03103

(603) 624-6341

300 Winston Street • Manchester, New Hampshire 03103 • (603) 624-6595 • FAX: (603) 628-6234

E-mail: EPD@manchesternh.gov • Website: www.manchesternh.gov

This page summarizes the opportunity, including an overview and a preview of the attached documents.

WASTEWATER TREATMENT PLANTSECONDARY CLARIFIER REPAIRS

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