FAIRHURST, J.
¶ 1 Tesoro Refining and Marketing Company (Tesoro) seeks a refund from the Department of Revenue (DOR) for the hazardous substance tax (HST) it paid for refinery gas yielded at its Anacortes, Washington, refinery. Tesoro claims its possession of refinery gas is exempt from taxation because Tesoro uses the gas within the refinery for heat. We hold Tesoro's use of refinery gas as a heat source constitutes a taxable possession of hazardous substances...
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