The US Coast Guard has wrapped up its inquiry into the oil spill into Lake Michigan from the BP Whiting Refinery last month, according to a report in the Times today, and those findings have been forwarded to a hearing officer in Washington DC. A decision is expected within thirty days on whether the oil giant will face any fines or penalties. A spokesman for BP says the company continues to investigate what caused the discharge March 24th. On April 4th, an assessment team made up of representatives from the US Coast Guard, Environmental Protection Agency, and BP determined that no further cleanup was recommended. A follow-up inspection of the lake and shoreline by the Coast Guard and EPA is planned this summer.