Kapolei West Phase I Improvements | Oahu, HI

Solution

During the course of the project, GBI’s work included 370,000 cubic yards of excavation, installation of 15,000 linear feet of utilities, and creation of 1,000 linear feet of roadway. It was also necessary to bypass:

• An eight-inch crude oil fuel line feeding the Kahe power plant,
• An eight-inch reverse osmosis reclaimed water line, which is the main source of coolant for the plant,
• The 33-inch reinforced concrete gravity sewer line, which is the only sewer service for Ko Olina.

Cutting of the crude oil pipe without any hazard to workers required utilizing a cold cut method on the steel pipeline. To quickly re-establish the connection, most of the bypass pipeline was prefabricated above ground and then set into place once the line was purged.

The reverse osmosis reclaimed water line was quickly bypassed with help from Board of Water Supply’s reclaim division. Good communication efforts with the division allowed GBI to relocate the line and return it to service in just a few hours.

Pumps were used to bypass the sewer line while GBI installed temporary lines. Rerouting them using pre-channeled manhole bases instead of traditional joints, GBI also quickly returned this line to service.