In 1976 the company name was shortened to Tosco after the company acquired the Avon Refinery in Martinez, California, and other west coast facilities from Phillips Petroleum, making it a major player in petroleum refining. The company continued its efforts in oil shale extraction until May 2, 1982 when Exxon (which had bought Atlantic Richfield's 60% share in the project in 1980) pulled out of the Colony Project joint venture, leaving Tosco unable to keep the venture viable in spite of a $1.1 million loan guarantee from the U.S. government. Exxon claimed the project's projected $6 billion price tag made the project no longer feasible, but Exxon was required to purchase Tosco's 40% share in the project as a result of their withdrawal.