Excessive inflow and infiltration (I/I) in the gravity sewer collection system was causing hydraulic overloading of the wastewater treatment system in the City of Ivanhoe. Several point repairs were performed to fix some of the known I/I sources, however, the repairs were not reducing I/I enough for the community to consistently meet their discharge permit. The City enlisted Banner’s expertise to perform an I/I investigation, including inventory and analysis of the current collection system pipe material and age, review of televising records, and identification of sump pump and roof drain connections.
The recommended improvements included a combination of traditional open-cut and trenchless construction methods. The project also incorporated water distribution system and storm drainage improvements. The trenchless construction methods were recommended to minimize street repairs at locations where these systems were not in need of upgrading and the pavement was in good condition. This allowed the City to focus their efforts on wastewater collection system improvements. The project was completed in the following two phases:
Bid Schedule No. 1 - Open-cut pipe replacement for the gravity sewer mains. Replacement of the 4-inch service lines connecting residences or businesses to the sewer main were integrated into the project. Water distribution system and storm drainage improvements were also incorporated into the improvements.
Bid Schedule No. 2 - Trenchless construction utilizing Cured-In-Place Pipe (CIPP) for both sewer main and lateral rehabilitation. This new technology for lining the services was implemented to benefit the residents of Ivanhoe through a generous grant. The project further reduced infiltration of groundwater into the sanitary sewer system.
Project Goal #1
Reduce hydraulic overloading (I/I) of the wastewater treatment facility
Project Goal #2
Utilize trenchless construction methods to maximize the funds directed to upgrading the wastewater collection system
- Sanitary Sewer Main Collection Lines - CIPP
- Sanitary Sewer Lateral Connections - CIPP
- Sanitary Sewer Laterals to ROW - CIPP
- Facility Plan
- Wastewater Collection Main Line Evaluation
- Preliminary/Final Design
- Construction Documents
- Bidding Services
- Construction Administration, Staking and Observations