2024 Manhole Rehabilitation Project

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The overall focus of this project is to reduce inflow/infiltration (I/I) of groundwater into manholes. The wastewater treatment & resource recovery facility (WWTRRF)  does not provide any treatment of groundwater entering the collection system, and that water has to be pumped, impacting 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.

This project work, expected to be completed in spring of 2025, will be evaluated for consideration to continue to do about 100 to 150 manholes per year over a 2- to 3-year period to reduce groundwater influence and provide for a consistent flow and treatment at the WWTRRF.

Funding

 Project costs will be expended from the Sewer Fund and is budgeted under capital outlay.

Estimated Construction Cost:
TBD
Actual Construction Cost:
TBD
Project Type:
Final Project Cost (Construction + Engineering):
TBD
Year Completed:
Why It's Needed
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

4300 SW Houtama Road
Pendleton, OR 97801
United States

Project Status

Project Milestones

Project Milestones
Date
November 2024
Milestone Description

City Council awarded the contract for the 2024 Manhole Rehabilitation Project  to Cascade Industrial Services, Rathdrum, ID, for $110,186.

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