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The ongong repairs for inflow and infiltration will keep several streets closed to traffic

GRAPHIC PHOTO: GARY ALLEN - Crews repair Third Street after removing dated and failing pipes and replacing them with new models that will stop inflow of ground water into the system.

The city of Newberg is undertaking several wastewater line replacement projects, which will keep streets closed to traffic intermittently through August.

City Engineer Kaaren Hoffman said all of the projects are to repair inflow and infiltration. She said the pipes often face decay caused by cracks by things like tree roots getting into the pipes, which facilitates inflow.

"It's ground water or other water getting into the wastewater pipe," she said.

From July 8 until the end of August, East Sixth Street between South Blaine and South Columbia streets and all intersections will be closed during work hours. From July 17 through 19, Third Street between South Main and South Blaine will be closed during work hours. And during that same time frame, West Third Street between South Harrison and South Grant streets will be closed during work hours.

Hoffman said those projects feature lines that are old and have brick-lined manhole covers. "We're replacing it with a better pipe," she said.

Hoffman said the total cost of wastewater line repairs to the city was nearly $1.3 million. That bid was eventually given to the Saunders Company, a Newberg firm.

The city's 2015 Keller and Associates Inflow and Infiltration study and the city's current capital improvement projects list identified the need to replace wastewater lines and manholes due to cracked and broken wastewater pipes and leaking brick-lined manholes. A City Council resolution lists inflow and infiltration as a major issue for Newberg's wastewater collection system.

Inflow is water that enters the pipe through cross connections. Infiltration is groundwater that enters the wastewater system through defective pipe joints, broken pipes, manhole walls or root intrusions. Reductions to inflow and infiltration over time will reduce the volume of storm water flowing into the system and, thus, treatment at the city's wastewater treatment plant. It will also produce a savings in overall long-term maintenance, operations and energy, city engineers said.

The city received seven qualified bids for the project, with the Saunders Company coming in the lowest. The city's engineer estimated the range for this project between $1.1 million and $1.35 million. The highest bid came in at nearly $2.2 million.

Work hours for road closures tend to be from 7 a.m. until 5:30 p.m.


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