Peirce Island Wastewater Facility Upgrade Project

This project is the largest that the City has undertaken. The Peirce Island Wastewater Treatment Facility (WWTF) upgrade expands treatment at the plant to an advanced secondary process which removes organics and nitrogen. Progress videos are available on our YouTube page, shown below.

Project Contact

Terry Desmarais

P.E, City Engineer

(603) 766-1421

tldesmarais@cityofportsmouth.com

Public Meetings

Monthly public meetings with City staff, the Contractor and other officials involved in the project are typically held every third Wednesday each month at 11 a.m. in City Hall's Conference Room A to ensure that citizens are informed; these meetings are broadcasted and available on the City’s YouTube channel, with presentations and notes available at Wastewater Public Meetings.

Upcoming Meetings

Wed Oct 17

Peirce Island Wastewater Treatment Facility Public Meeting

11:00 AM
Conference Room A, City Hall

Wed Nov 21

Peirce Island Wastewater Treatment Facility Public Meeting

11:00 AM
Conference Room A, City Hall

Wed Dec 19

Peirce Island Wastewater Treatment Facility Public Meeting

11:00 AM
Conference Room A, City Hall

THE COMING WEEK

Week of October 8, 2018

Anticipated Construction Traffic Volume: High

This work this week will include, but not be limited to:

*10/1/18 – 12/16/18: First shift work beginning at 6 a.m. to complete carpentry work; no over length trucks will be picked up by police detail prior to 6:30 a.m. to be brought to the site for unloading at 7 a.m. Second shift (2:30 p.m. – 11 p.m.) work to occur to install pipe and fittings in the BAF Building pipe gallery.

Continue installation of reinforcing steel and concrete for walls, elevated slabs, columns and beams at the Solids Building
Continue installation of precast roof planks at the Solids Building
Install mechanical process piping and equipment in the Solids Building
Install reinforcing steel, concrete, and masonry for the Biologically Activated Filter (BAF) Building floors and walls
Continue construction of masonry and brick walls in the Biologically Activated Filter Building
Install mechanical process piping in the Biologically Activated Filter Building
Continue mechanical, electrical, plumbing, HVAC, and masonry activities in the Grit Building and Grit Chambers
Install underground process piping throughout the site
Export excavated materials off site

PROJECT FACTSHEET

Start Date: September 2016
BAF Substantial Completion: December 2019
Secondary Permit Compliance: April 2020
Project Substantial Completion: May 2020
Final Completion: August 2020
Project Construction Costs:
- Base Contract: $72,785,545.00
- Change Order No. 1: $367,290.42
- Change Order No. 2: $546,722.46
- Change Order No. 3: $ 93,838.31
- Change Order No. 4: $162,869.20
- Change Order No. 5: $249,828.16
- Total Contract: $74,206,093.55
Design Engineer: AECOM
General Contractor: Methuen Construction
Design Flow: 6.1 MGD average
New Treatment Processes:
- New Headworks
- Biologically aerated/anoxic filter (BAF) using the Kruger BioSTYR ™ technology for Secondary Treatment and Nitrogen Removal
- Rotary screw presses for solids dewatering
- Simplified Process Flow Schematic