press release

Unocal CEO and CFO certify SEC filings

El Segundo, Calif., Aug. 13, 2002 - Unocal Corporation (NYSE: UCL) today said that its chief executive officer and chief financial officer signed and filed sworn statements with the U.S. Securities and Exchange Commission (SEC) regarding the accuracy of the company's recent reports filed with the SEC.

Unocal CEO Charles R. Williamson and Unocal CFO Terry G. Dallas signed sworn statements attesting as to the truth and completeness of the 2001 Annual Report on Form 10-K, as well as subsequent Form 10-Q and Form 8-K reports and proxy statement.

Unocal is one of 947 large public companies whose CEO and CFO are required by the SEC under Order No. 4-460 to file sworn statements affirming the accuracy of filings with the commission.

Williamson and Dallas also signed and submitted separate certifications for Unocal's second quarter 2002 Form 10-Q as required by Section 906 of the Sarbanes-Oxley Act.

"Unocal is committed to the highest levels of ethics, corporate governance and financial transparency," Williamson said. "We have long stressed the importance of providing investors and the public with materially accurate and complete information about the performance our company."

About Unocal Corporation

Unocal is one of the world's leading independent natural gas and crude oil exploration and production companies. The company's oil and gas activities are in North America, Asia, Latin America, and the North Sea. Unocal is one of the world's largest producers of geothermal energy with operations in the Philippines and Indonesia.

Updated: August 2002