projects

Foundry Street Pump Station Replacement

Rollinsford, New Hampshire

Client: Rollinsford Water & Sewer District

Services

  • Construction Administration
  • Construction Observation
  • Final Design
  • Funding Assistance
  • Study and Evaluation

Project Summary

The original pump station was constructed in the late 1960’s and consisted of a cast-in-place concrete wet well with the pumps, controls and ancillary equipment housed in a below-ground steel structure. This is one of two primary pump stations in the District and it conveys approximately 50 percent of the flow to the wastewater treatment facility. The pumps, which were replaced in 1985 with used pumps, were failing and the below-ground steel dry well structure was starting to leak due to age and corrosion. Hoyle Tanner completed an engineering study and recommended that the existing wet well structure be kept in service since it was in good shape and that the below-ground dry well structure be replaced with an above-ground pump station mounted on top of the existing wet well structure. This not only provided new, reliable, more efficient pumping equipment but also eliminated the need for confined space entry.

Replacement of the existing pump station was necessary to prevent potential adverse impacts to both public health and the environment that could occur as a result of equipment failure. Replacement of the pump station also restored reliability of the pump station, improved safety by eliminating confined space entry for the dry well, and improved efficiency by installing modern more efficient pumps and motors and replacing the constant speed (on/off) control system with a variable speed control system. This project also minimized impacts due to construction and made maximum use of the existing facilities resulting in the least cost option to the District.

This is the last wastewater project in New Hampshire funding under the American Recovery and Reinvestment Act (ARRA) of 2009. The project was funded through the New Hampshire Department of Environmental Services (NHDES) Clean Water State Revolving Fund (CWSRF) loan program. The ARRA funding was provided in the form of forgiveness of 50 percent of the CWSRF loan principle thereby reducing the District share to 50 percent of the project cost.

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