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U. S. T.U.R. L/C SITE REPORT <br /> C.A.S. numbers <br /> The material safety data sheet for the unleaded <br /> Supreme motor fuel which was stored in the tank <br /> states: <br /> C.A.S. 71-43-2 Benzene <5% <br /> C.A.S. 110-54-3 Hexane 1-5% <br /> C.A.S. 108-88-3 Toluene 5-15 <br /> C.A.S. 1330-20-7 Xylene unstated <br /> C.A.S. 1634-04-4 Methylterbutyl ether Max. 10% <br />