2025 Manhole Project
City staff has worked with our consultant, Consor, to complete a project package for manhole rehabilitation work. The overall focus of this project is to reduce the amount of groundwater and riverwater that enters the wastewater system through manholes. This is known as reducing the inflow/infiltration (I/I) of groundwater into manholes located where there is river influence contributing to groundwater getting inside the manholes.
The extra water in the wastewater system impacts the overall effectiveness of the wastewater treatment & resource recovery facility (WWTRRF). The WWTRRF provides biological treatment of sanitary sewer collection flows, and when groundwater is mixed with sanitary sewer flow, it has to be pumped out and impacts the overall biological treatment.
This project provides for measures to seal the contact points between the manhole base and the first, and in some cases the second barrel rings. Imagine sections of 4-foot diameter pipe, turned on its side and stacked on top each other. The contact points where the pipes are stacked will be sealed from this project work to keep groundwater from entering. The project will focus on 98 manholes located to the west of Main Street ending near McKennon Road.
Estimated completion: 2025
FISCAL IMPACT: Project costs will be expended from the Sewer Fund and is budgeted under capital outlay.
Funding
Project costs will be expended from the Sewer Fund and is budgeted under capital outlay.
| Project Title: | 2025 Manhole Project |
| Estimated Construction Cost: | 110,186 |
| Actual Construction Cost: | TBD |
| Project Type: | Wastewater |
| Final Project Cost (Construction + Engineering): | TBD |
| Year Completed: | In Progress |
Why It's Needed
Community benefit: This project will assist with reducing I/I that was identified as an issue in the 2015 Adopted Sewer Collection System Master Plan. It will provide benefit to lower pumping costs at the WWTRRF to move the groundwater within the facility and assist with the biological treatment process. Reducing groundwater inflow/infiltration (I/I) also provides for more future capacity for biological treatment at the WWTRRF under the National Pollution Discharge Elimination System (NPDES) permit.
Address
500 SW Dorion Ave, Pendleton, OR 97801, USA
Project Status
In Progress
Project Milestones
City Council approved a contract of $110,186 to Cascade Industrial Services, Rathdrum, ID for the Manhole Rehabilitation Project.
Work begins