Coast Guard pollution investigators reported yesterday that an oil slick off Ko Olina, along the Wai'anae Coast, has mostly dissipated and had little impact on the shoreline. The cause of the slick remained under investigation.

The estimated 500-gallon spill of marine diesel fuel caused a 3-mile slick between Barbers Point and Nanakuli Saturday.

Swimming lagoons at Ko Olina Resort were evacuated by resort security personnel as a precaution.

The Coast Guard and state agencies are working to find the source of the spill. Pacific Environmental Corp. has been hired to do any necessary cleanup.

No visible shoreline damage has been reported.

Minor vessel damage has been reported. Boat owners with questions are urged to call the Coast Guard at 808-842-2672 for more information.