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Repairs to Cornelius water line continue

Work to repair a cracked 54-inch valve on a broken 72-inch water transmission line that runs through Cornelius is continuing this week, according to Tacy Steele, public information officer for the city of Hillsboro’s Water Department.

The water line, part of the Joint Water Commission’s transmission system, has been out of service since workers discovered a leak Feb. 11. It serves a large part of Washington County, including Hillsboro, Beaverton, North Plains and the Tualatin Valley Water District. Parts have been ordered “from various suppliers across the country, and all repair components should be delivered and ready for install by March 21,” Steele said.

The 8,000-pound replacement valve was purchased from Denver Water.

The city of Cornelius, JWC and Kerr Contractors have “worked together to develop a repair plan and work schedule,” Steele said. “The entire repair is anticipated to take about three weeks once crews begin to drain the transmission main for the repair.”

About 1.8 million gallons of water will be drained from the pipe, and staff members will coordinate with Clean Water Services on a procedure for the two-day discharge of water into the storm sewer system, Steele added.

The cracked valve is located more than 10 feet below ground on 12th Avenue, next to Veterans Memorial Park.

“The repair will be difficult due to the deep excavation, in-line valve replacement and tremendous size of the components,” said Steele.

City officials estimate the transmission line will be back in service by April 1.

Cornelius and JWC customers served by the line are receiving water from the remaining transmission system.

“There is ample supply in the transmission system to meet the regular needs of all JWC customers this time of year, and also provide water for fire suppression, if needed,” Steele said.

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