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.

NOTICE: A routine inspection of the Peirce Island Bridge will take place on Monday, November 25. For more information, click here.

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 Dec 18

THE COMING WEEK

Anticipated Construction Traffic Volume: High

Week of December 9, 2019 - work will include, but is not limited to:

Continue installation of stairs and other miscellaneous metals in the Solids and BAF Buildings
Continue electrical, plumbing, and HVAC activities in the Solids Building, BAF Building, and Gravity Thickeners
Continue painting in the Grit Building, Solids Building, BAF Building, and Gravity Thickeners
Continue startup of process equipment and valves in the BAF Building
Continue architectural, mechanical, electrical, plumbing, and HVAC activities in the Grit Building
Continue demolition of the existing Sludge Processing Building
Continue installation of the new Gravity Thickener mechanism
Install and test underground process piping throughout the site

PROJECT FACTSHEET

Start Date: September 2016
BAF Substantial Completion: December 2019
Secondary Permit Compliance: April 2020
Project Substantial Completion: June 2020
Final Completion: September 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
- Change Order No. 6: $292,031.11
- Change Order No. 7: $169,138.30
- Change Order No. 8: $112,659.75
- Total Contract: $74,779,922.71
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