Peirce Island Wastewater Treatment Facility Upgrade
The City’s Peirce Island Wastewater Treatment Facility is undergoing an upgrade. This project will convert the existing primary treatment facility to a secondary treatment facility with the ability to remove nitrogen. The project began in September 2016 and will continue until 2020. Details on the construction schedule and aerial photographs and videos of the construction can be seen at http://www.portsmouthwastewater.com/piupgrade.html.
Lafayette Road Pumping Station Upgrade
The Lafayette Road Pumping Station is the City’s 3rd largest wastewater pumping station and serves the southern portion of the City. The station will be receiving a full mechanic equipment replacement. This project will address station reliability by replacing all the mechanical components and will include modifications to the esthetics of the station. The project was bid in March 2017. Construction is anticipated to begin in May 2017 with project completion in early 2018.
Proposed Pump Station Rendering from Lafayette Road Looking North
Fleet Street Reconstruction
This project includes the reconstruction of Fleet Street from Hanover Street to Court Street. This work will include roadway reconstruction, replacement of sidewalks, utility work including new storm drains, sanitary sewers, and water mains. The planning for this work will include planning for utility corridors and sewer separation in the Fleet Street area extending to Market Square and to Maplewood Avenue. The project will be coordinated with work on Chestnut Street.
Union Street Reconstruction
This project includes the reconstruction of Union Street from State Street to Middle Street. This project is part of the City’s continued sewer separation to reduce combined sewer overflows. The work will include roadway reconstruction, replacement of sidewalks, utility work including new storm drains, separate sanitary sewers, and water mains. The planning for this work will include an evaluation of the alignment for new drainage down Middle Street. This will provide an outlet for the stormwater discharge.
Pease Headworks Improvements
The Pease Wastewater Treatment Facility was constructed in the 1950’s and will be upgraded in phases over the next several years. The first phase of work is a new Headworks Building that will incorporate wastewater screening, grit removal and raw sewage pumping. Future upgrades may include wastewater treatment process improvements and potential modification to accommodate additional capacity for wastewater customers at the Pease International Tradeport.
Proposed New Headworks Building Rendering from Corporate Drive Looking Southeast
Infiltration/Inflow (I/I) Study and Private Inflow Program
The City initiated a sewer system infiltration/inflow study and private inflow program in the spring of 2015. The infiltration/inflow study will identify sources of groundwater and rain water entering the sewer system outside of the few remaining un-separated sewer areas downtown. Infiltration is groundwater that enters the sewer system through leaking manholes and cracked or broken pipe, while inflow is both stormwater and groundwater that enters the sewer system through direct connections including sump pumps, basement drains, yard drains, catch basins and roof downspouts. The first phase of work included measuring wastewater flows in the sewer system to identify locations of excessive infiltration and inflow. The second phase of work planned for spring/summer of 2017 will include additional investigations to identify the specific source of infiltration and inflow. This work will provide the City with a set of recommendations for sewer rehabilitation and/or replacement and for other project to remove extraneous flow.