FIRST AMENDMENT TO AMENDED AND RESTATED REVOLVING CREDIT AND LETTER OF CREDIT AGREEMENT This Amendment, dated as of June 30, 1998, is entered into by (1) FRONTIER OIL AND REFINING COMPANY, a Delaware corporation (the "Borrower"), (2) the banks parties...Revolving Credit and Letter of Credit Agreement • July 28th, 1998 • Frontier Oil Corp /New/ • Petroleum refining • California
