HONOLULU — Honolulu is taking steps to repair a 900-foot (274-meter) portion of a crumbling sea wall in a project that could cost the city anywhere from $1.8 million to $3.1 million.

According to a recent report, waves have caused the wall to have problems with its foundation, damage to its concrete cap, missing and loose rocks, and cracks in its retaining walls.

Honolulu engineering company Oceanit, the city’s consultant, said in a draft environmental assessment that the sea wall’s mass and multiple repairs have kept it from collapsing so far. However, more extensive repairs are needed to keep it from collapsing.

“Failure of the sea wall will result in extreme erosion of land side back fill, runoff into the ocean, potential damage to the promenade and increase the likelihood of accidents and injuries,” Oceanit said.

The sea wall last underwent major repairs in 1987, the Honolulu Star-Advertiser reported (http://bit.ly/2s60aJI ).

Oceanit recommends the city spend approximately $2 million to repair the sea wall by adding a form-lined concrete wall on the makai side and concrete support on the land side. Three other Oceanit proposals up for review range from various sea wall repairs to replacing a 460-foot stretch of the wall.

The least expensive proposal would cost nearly $1.81 million to repair the sea wall by adding rock revetment at its base and installing concrete support on its land slide. Reconstructing the sea wall and adding soil reinforcement would cost $3.1 million.

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