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Public Notice - WWTF Phase III Upgrade Environmental Review

Posted on: December 14, 2020 - 2:42pm
public notice

Project: Phase III Upgrade of WWTF and 3 Pump Stations
Applicant: Town of Merrimack NH
Address: 36 Mast Road, PO Box 235, Merrimack NH 03054
Technical Contact: Ms. Sarita Croce, Town of Merrimack Assistant Public Works Director/Wastewater
Telephone Number: 603-883-8196

Project Summary:  The Town of Merrimack will be upgrading 3 pumps stations and the wastewater treatment facility (WWTF). The total cost of the project is $22.62 million which is being funding by a Clean Water State Revolving Fund (CWSRF) loan through the State of New Hampshire Department of Environmental Services.

The proposed project includes:

  • Construction of New Influent Screenings Facility
  • Comprehensive Upgrade of Main Pump Station
  • Replacement of One Primary Clarifier Mechanism
  • Replacement of Three Secondary Clarifier Mechanisms and Addition of Algae Brush System
  • Modifications to Sludge Storage Tanks
  • Modifications to Headworks Building
  • New Emergency Generator and Electrical Upgrades
  • Laboratory, Restroom/Locker Room, Conference Room and Office Spaces Renovation
  • Sludge Handling and Tank Drainage Piping/Valve Manifold, One Primary Sludge Pump (5) and One Tank Drain Pump Replacement
  • Roof Replacement and Miscellaneous Structural Repairs
  • Modifications to Chlorination Building
  • Electrical Upgrades
  • Secondary Sludge Pumps and Piping/Valve Manifold Replacement
  • Upgrade of Compost Facility Ventilation System
  • Replacement of Amendment Storage Facility
  • Comprehensive Upgrade of Thornton’s Ferry Pump Station
  • Comprehensive Upgrade of Souhegan Pump Station
  • Other Miscellaneous Upgrades Throughout the WWTF

Environmental permits that will be needed:

  1. Wastewater Engineering Bureau:  Construction General Permit (CGP) and Remediation General Permit (RGP) if dewatering is required.
  2. Air Resources Division – Air permit for the installation and operations of new emergency generators.
  3. Shoreland Permit by Notification.

A Finding of No Significant Impact (FONSI) is proposed.

The full document is available at, and comments may be addressed to, the following locations: Sarita Croce, Merrimack WWTF, 36 Mast Road, PO Box 235, Merrimack, NH 03054 and Tracy Wood, NHDES, Wastewater Engineering Bureau, P.O. Box 95, Concord, NH 03302-0095. The deadline for submitting comments is thirty days from the date of this publication.