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U.S. EPA SETTLES CLEAN AIR ACT CASE AGAINST UNOCAL FOR $48,000

 SAN FRANCISCO, Feb. 25 /PRNewswire/ -- The U.S. Environmental Protection Agency (U.S. EPA) today announced that Unocal Corp. (NYSE: UCL) has agreed to pay a penalty of $48,000 to settle alleged violations of the Clean Air Act at its refinery in Arroyo Grande, Calif.
 In a complaint issued on Sept. 30, 1992, U.S. EPA claimed that the Unocal facility violated the Act's new source performance standards for petroleum refineries by failing to submit semiannual reports to U.S. EPA on excess emissions and the performance of its continuous emission monitoring system (CEMS). Such a system had been installed by Unocal to meet an Oct. 2, 1991, deadline mandated by the Clean Air Act.
 A CEMS is installed to measure either the concentration of hydrogen sulfide in fuel gases before they are burned in any combustion device or the amount of sulfur dioxide emitted after burning. Semiannual reports to U.S. EPA on whether any excess emissions were measured by the CEMS are used to help ensure compliance with emission limits set by the new source performance standards.
 Sulfur dioxide is a gas that is produced when fossil fuels are burned. At high enough concentrations, it can adversely affect human health and vegetation. In addition, sulfur dioxide is the primary cause of acid rain, which is formed when the chemical reacts in the atmosphere to form acidic compounds. The Clean Air Act Amendments of 1990 will reduce annual sulfur dioxide emissions by 10 million tons -- more than 50 percent -- by the year 2000.
 The complaint against Unocal was one of eight similar cases brought concurrently against oil refineries in California and Hawaii by U.S. EPA.
 -0- 2/25/93
 /CONTACT: Bill Glenn of U.S. EPA, 415-744-1589/
 (UCL)


CO: U.S. Environmental Protection Agency; Unocal Corp. ST: California IN: OIL SU:

TM -- SF005 -- 0455 02/25/93 14:21 EST
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Date:Feb 25, 1993
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