CHEVRON VIOLATED TEXAS SIP EMISSION LIMITS FOR SULFUR DIOXIDE AND PSD PERMITTING REQUIREMENTS WHEN, ON 10/01/77 IT BEGAN A MAJOR MODIFICATION AT ITS EP PASO REFINERY. BE- FORE THAT DATE CHEVRON HAD USED THE SULFUR REMOVAL SERVICES OF EL PASO ACID CORPORATION. ON 10/1/77, CHEVRON CLOSED USING THESE SERVICES AND THE REFINERY BURNED FUEL GAS UNCON- TROLLED FOR HYDROGEN SULFIDE UNTIL 3/6/79, WHEN THE COMPANY COMPLETED CONSTRUCTION OF ITS OWN ACID PLANT AND BEGAN ITS OPERATION.