FIRST AMENDMENT AND WAIVER dated as of September 22, 1997, to the STOCKHOLDER AGREEMENT dated as of May 1, 1997 (the "Original Agreement"), between VALERO ENERGY CORPORATION, formerly known as Valero Refining and Marketing Company, a Delaware...Stockholder Agreement • September 23rd, 1997 • Salomon Inc • Security brokers, dealers & flotation companies • New York
