City says corrosion caused large sewage spill near Ko Olina

We’re learning more about a massive sewage spill late last month near Ko Olina.

The city submitted to the state Friday its report on a sewage spill that occurred on Nov. 29.

The report is normally required five days after a spill, but the city had asked for an extension.

According to the report, corrosion caused a break in the 20-inch force main leading from West Beach No. 2 Wastewater Pump Station and spilled an estimated 201,600 gallons of untreated sewage in an unimproved area outside the Ko Olina Golf Course owned by Oceanwide Resort Community HILLC.

Crews were able to recover about 28,000 gallons of the spill and the remainder dissipated into the ground, it said.

A review of data shows that the break started at approximately 10 a.m. The spill was first reported to the city by an eye witness at 8 a.m. Nov. 30 and crews fully contained the spill at 4:45 p.m. that same day.

A third-party contractor started work late that afternoon to replace a 16-foot portion of the pipe, and the pipe was back in full operation by 3 p.m. the following day, Dec. 1.

The spilled covered a little over one acre, which was disinfected and deodorized on three occasions: Nov. 30, Dec. 2, and Dec. 6.

Due to the fact that none of the spill reached any waterway and that the spill occurred inland on private property in a remote area, officials determined there was no threat to human health.

Warning signs were placed surrounding the remote area where the spill occurred and public access was restricted.

Click here to view the report in its entirety.

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