An alarm from a leak detection system sounded at 4:10 p.m. on October 1 and the operators shut down the pipeline. Believing that the system was providing false alarms for a leak at the platform, they began a series of restarting and stopping the flow of oil throughout the night. In the afternoon and evening of October 1,
Huntington Beach and
Newport Beach residents were already noticing a strong odor and called the police department to report the smell of oil fumes or hot roofing bitumen. Multiple calls concerning a possible spill north of the
Huntington Beach Pier came in over a
marine radio emergency channel from boats leaving the
Pacific Airshow. The harbor patrol looked for the spill but found nothing on the water. In the evening, a foreign ship anchored off the coast reported a possible oil slick about west of Huntington Beach. A
satellite image from the
European Space Agency was reviewed by a
National Oceanic and Atmospheric Administration analyst which confirmed a substance on the water which was most likely petroleum. The Marine Oil Spill Thickness (MOST) project also deployed Uninhabited Aerial Vehicle Synthetic Aperture Radar (UAVSAR) to assist by measuring the thickness of the oil spill from an aircraft. The National Response Center, staffed by
United States Coast Guard officers and marine science technicians, is the sole federal point of contact for reporting all hazardous substances releases and oil spills. They forwarded the information to the Office of Spill Prevention and Response (OSPR), a division of the
California Department of Fish and Wildlife charged with handling such emergencies. OSPR dispatched but encountered foggy conditions. The Coast Guard and
Orange County Sheriff's Department flew out once the fog had lifted to the reported leak location to investigate. Control room operators on platform Elly shut down the pipeline at 6:01 a.m. on October 2 in response to a low-pressure alarm according to the
Pipeline and Hazardous Materials Safety Administration after ignoring 83 alarms indicating the offshore pipeline was leaking for about 17 hours. They also failed to notify the Coast Guard until 9:07 a.m. The pipeline was suctioned at both ends to stop the flow of oil after it was shut down. A full-scale mobilization effort was established with a
Unified Command (ICS) which would eventually consist of the Coast Guard and the Office of Spill Prevention and Response with support from the cities of
Long Beach, Newport Beach, Huntington Beach, the Orange County Sheriff's Department, and the
county of San Diego together with the responsible party, Beta Offshore. The
US Coast Guard estimated that spill covered of the ocean's surface as they monitored it several times daily from the air. Officials characterized it as isolated ribbons of oil, or patches of oil rather than a big blob. Wind, waves and tides all help determine the impact of an oil slick. Generally mild conditions kept the bulk of the oil offshore, which is much simpler for crews to contain and clean up. The initial mobilization included mechanical equipment called skimmers that collect the oil on the surface of the water. Barriers called booms were also set up in the open ocean to try to stop the oil from spreading. The ocean currents pushed the plumes of oil south without large amounts entering the
surf zone and fouling the beaches. Rocky coves along the coast south of Newport Beach which would have been difficult to clean were mainly spared. Cleanup efforts can damage the animals and plants that live there. During the days, workers in hazmat gear scoured the beaches to find and remove tar balls and any traces of damage from the spill. More than 1,300 workers were cleaning the shoreline in much of Orange County by October 9. ==Pipeline investigation==