Oak Creek — The Common Council on Tuesday approved an agreement that requires the remainder of the former Delphi Automotive Systems plant to be demolished by Oct. 31 and an agreement with a retiring employee that is expected to save the city thousands of dollars.City Administrator Pat DeGrave said Wednesday:The Delphi agreement allows for the plant's fire suppression system to be disabled, which enables the owner, DPH Holdings Corp., not to have to pay to heat the 1 million-square-foot facility during the winter.