Honolulu has completed a supplemental environmental study in response to a federal judge’s ruling on the city’s rail project.

The study says a Beretania Street tunnel is feasible but not prudent because of its “extraordinary costs” and long-term construction impacts. It also says the project won’t “substantially impair” any of Mother Waldron Park’s recreational uses.

The judge said Honolulu failed to adequately consider building a Beretania tunnel as part of an alternative route. He also said the city didn’t properly evaluate whether the rail project would constructively use the park in Kakaako. 

The Honolulu Authority for Rapid Transportation said today the authority and the Federal Transit Administration prepared the draft environmental impact statement to address those issues.

A public hearing on the draft will be held July 9.