ARCO [LOGO] Media Relations N E W S 515 South Flower Street Los Angeles, CA 90071-2201 Telephone 213 486 3385 Facsimile 213 486 0169 FOR IMMEDIATE RELEASE June 23, 1997 MICHAEL E. WILEY ELECTED TO ARCO'S BOARD OF DIRECTORS LOS ANGELES -- The election of Michael E. Wiley to the ARCO Board of Directors was announced today by ARCO Chairman and Chief Executive Officer Mike R. Bowlin. Wiley, 46, is an ARCO Executive Vice President and Chairman of Houston-based Vastar Resources, Inc., which is 82.3% owned by ARCO (NYSE: ARC). As Executive Vice President, Wiley serves as a member of ARCO's Management Group. His special focus is on Lower 48 oil and gas production, marketing and technology, as well as ARCO's Lower 48 pipeline operations and environmental remediation activities. In addition, Wiley plays a key role in developing ARCO's joint venture with the Russian oil company LUKOIL. Wiley is a graduate of the University of Tulsa where he received a BS degree in petroleum engineering. He later received an MBA from the University of Dallas. He joined ARCO in 1972 and served in a number of engineering and operational assignments in ARCO's Lower 48, Alaska and international oil and gas operations prior to being elected Senior Vice President and President of ARCO Oil and Gas Company. When Vastar was formed in 1993, Wiley became its first President. He became Page 2 Vastar's Chief Executive Officer in 1994 and Chairman of its Board of Directors in 1996. He remained Vastar's CEO and President until his election as an ARCO Executive Vice President in March, 1997. # # # For information, contact: Albert Greenstein (213) 486-3384.