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City completes $375 million Kaneohe-Kailua sewer tunnel project

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Mayor Kirk Caldwell speaks at today’s press conference announcing the completion of the “KK Tunnel.”

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The tunnel-boring machine nicknamed “Pohakulani” is lowered into place in Kailua as part of the Kaneohe-Kailua gravity sewer tunnel project that is now completed.

City officials today announced the completion of the $375 million Kaneohe-Kailua gravity sewer tunnel project that is designed to increase storage capacity for Windward Oahu’s wastewater system and reduce the possibility of overflow.

The project, required by a court-mandated consent decree, began in 2013. It features a three-mile tunnel bored beneath Oneawa Hills that took roughly 13 months to complete using a tunnel-boring machine to drill the 13-foot-diameter tunnel to house a 10-foot sewage pipe.

The pipe will deliver sewage to the Kailua Regional Wastewater Treatment Plant from the Kaneohe Wastewater Pre-Treatment Facility by way of gravity.

The tunnel runs from a depth of 35 feet below ground level on the Kaneohe side down to a depth of 62 feet on the Kailua side, city officials said.

The project also includes a new pump station, generator building, and odor-control facilities.

KK Tunnel Route Map by Honolulu Star-Advertiser on Scribd

KK Tunnel Fact Sheet by Honolulu Star-Advertiser on Scribd

For more on the project, go to https://www.kktunnel.org/project-overview/.

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