The city on Thursday will beginning preliminary testing work for a proposed elevated rail line that would run from East Kapolei to Ala Moana Center.

Nighttime soil samples will be collected for the first phase of construction — a 6.5 mile section from East Kapolei to Pearl City. The tests will determine soil stability so the city can refine the design and placement of concrete pillars that will support the steel wheel on steel track system.

The city said work in residential areas will be done primarily along the Farrington Highway median between Waipahu High School and Fort Weaver Road. The testing is expected to be finished by early September. Kiewit Pacific, the contractor for the initial stage of construction, will do the testing.

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