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 or by Zoom Webinar to ensure that citizens are informed; these meetings are broadcast and available on the City’s YouTube channel, with presentations and notes available at the Wastewater Public Meetings page.

Upcoming Meetings

Wed Oct 21

THE COMING WEEK

Anticipated Construction Traffic Volume: Moderate

Week of September 21, 2020 - work will include, but is not limited to:

Continue minor electrical, plumbing, and HVAC activities in the Solids Building, BAF Building, and Grit Building
Continue optimization of the BAF process
Continue architectural work for the new Operations / Lab Building
Continue plumbing, HVAC and electrical work for the new Operations / Lab Building
Continue process mechanical work for the new Operations / Lab Building
Continue final site work

PROJECT FACTSHEET

Start Date: September 2016
BAF Substantial Completion: December 2019
Secondary Permit Compliance: April 2020
Project Substantial Completion: June 2020
Final Completion:
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
- Change Order No. 9: $242,419.68
- Change Order No.10:$122,783.46
- Total Contract: $75,145,125.85
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