TERMINAL RFG TANK MISTAKENLY TOOK ON 25,000 GALLONS OF CG. TOTAL FUEL IN TANK INCLUDING CG WAS 1,300,000 GALLONS. CITG O LOCKED TANK AND SELF-REPORTED. MIXTURE DID NOT VIOLATE VO C STANDARD. VIOLATION OF SELLING RFG COMMINGLED WITH CG. F ROM EAST CHICAGO TERMINAL 33,194 BBLS OF RFG CONTAINED 603 B BLS OF CG. CITGO LOCKED TANK. EPA ALLOWED SALE BASED ON FA CT THAT GASOLINE MIXTURE MET RFG STANDARDS. CITGO PAID ECON OMIC BENEFIT OF SELLING 603 BBLS OF CG AS RFG.