Current Projects

Phalen Creek Storm Tunnel Rehab

Portions of the Phalen Creek Storm Tunnel system are in need of rehabilitation.  The rehab work is to be completed in 3 project phases (2016 – 2019).

The main work site is located between 4th Street and the Kellogg (3rd) Street Bridge, and is planned to be utilized through the Spring of 2019. 

See photo and aerial map for work site location, and approximate limits of project phases 1 and 2.

The rehab work is mostly underground, and includes constructing a reinforced concrete liner inside the existing tunnel, as the existing tunnel floor and roof are in poor condition.

Phase 1 project work began in the Fall of 2016, and included construction of a temporary paved trail to maintain pedestrian and bike traffic around the work site.

The temporary trail and chain-link fencing (to secure the work site) are to remain in-place through the Spring of 2019.  Phase 1 work was completed in October of 2017.

Phase 2 project work is planned to begin in November of 2017 and be completed in the Spring of 2018.

Phase 3 project work is planned to begin in the Fall of 2018 and be completed in the Spring of 2019. 

Inflow and Infiltration Project

The City of Saint Paul has been successful in identifying and removing Inflow and Infiltration (l/I) sources but understands that a significant portion of l/I entering its sanitary sewer collection system is due to private property sources. In this pilot study project, we will investigate, measure and address potential I/I sources from the private property sources through private lateral connections. 

The pilot project area is in the D-15-2 sewershed located on the westside of the City of Saint Paul. The proposed project area covering a three by ten block area between George Street West and Annapolis Street West.  The project area is intentionally divided into three sub sewersheds as depicted in Figure1 to be able to able to have flexibility as the budget allocated for the project is limited.  The project area is largely residential area consisting of approximately 452 properties, 423 of which are residential.

This pilot study is divided in to three phases:

Phase I (Investigation Phase) will be conducted in 2019 which will include: flow monitoring, private lateral connections inspection;

Phase II (Rehab Phase) will be conducted in 2020 which will include repairing of private lateral connections identified as defectives and

Phase III (Analysis phase) will be conducted in 2021 which will include flow data monitoring and analysis.

The overall scope of the flow monitoring program will be conducted from early Spring 2019 through fall 2021.

West Side Flats Flow Monitoring Program

This study project will address the inflow/infiltration (I/I) mitigation efforts in the sanitary sewer collection system serving the Riverview Lift Station area on the City of Saint Paul west side area. It is to determine if adequate I/I reduction has occurred from recent sanitary sewer collection system investigations and sewer rehabilitation to allow continued community development in the West Side Flats area.

The overall scope of the flow monitoring program will be conducted from early fall 2018 through fall 2019 (the remaining duration of the current West Side Flats Flow Monitoring Program).

Como / Zoo Flow Monitoring and Capacity Analysis Project

The program is designed to gain a better understanding of the wastewater flow conditions in the sanitary sewer collection system downstream of the Como Zoo.

The Como Area neighborhood is located east of the Como Avenue and Lexington Parkway N intersection in the City of Saint Paul. This neighborhood is located downstream of the Como Zoo, which consists of open air animal exhibits that require the storm water runoff to be discharged to the sanitary sewer.

The objective of this work plan will be to collect additional wastewater flow data to update and calibrate the City’s existing sanitary sewer model (PCSWMM) as needed to determine any future measures required to minimize sanitary sewer backups in the Como Area neighborhood. SEH will work with City staff to coordinate current and future efforts in developing an effective flow monitoring plan which will include the installation and data collection of wastewater flows at approximately six (6) meter locations and a rain gage station for the Como Area neighborhood of the City of Saint Paul.

The overall scope of the flow monitoring program will be conducted from early fall 2018 through fall 2019.