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 available on the City’s YouTube channel, with presentations and meeting minutes available on the Wastewater Public Meetings page.

ANTICIPATED WORK IN MAY 2021:

Anticipated Construction Traffic Volume: Low

Work will include, but is not limited to:

Continue minor electrical, plumbing, and HVAC activities in the Solids Building, BAF Building, Grit Building, and Operations/Lab Building
Continue optimization of the BAF process
Continue demobilization and restoration of areas disturbed during construction

PROJECT FACTSHEET

Start Date: September 2016
BAF Substantial Completion: December 2019
Secondary Permit Compliance: April 2020
Project Substantial Completion: Early 2021 (under review)
Final Completion: Early 2021 (under review)
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
- Change Order No.11:$138,938.61
- Total Contract: $75,284,064.46
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