Hawaii Independent Energy warned that oily debris from a spill on Sunday 1.5 miles off Barbers Point could hit Oahu Wednesday morning.

The “slight possibility” of the oily debris arriving on shores west of Iroquois Point is based on the weather forecast and tides Tuesday evening, HIE said in an email.

On Sunday the release of 1,200 gallons of oil and water off Barbers Point occurred during routine maintenance of the hose used to transfer crude oil and refined products between oil tankers and Hawaii Independent Energy’s single-point mooring off Barbers Point, HIE said.

A spokesman for HIE said Tuesday an investigation is being conducted to determine the cause of the release, but no transfer of oil or refined products was occurring at the time of the spill.

HIE, the Coast Guard and the state Department of Health will deploy a shoreline cleanup and assessment team Wednesday morning as a precaution. The state Department of Land and Natural Resources is also responding.