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Substances which are not regulated as used oils include: <br /> • Oils with a flashpoint below 100°F; <br /> • Oils mixed with hazardous waste; <br /> • Wastewater containing small amounts of used oil; <br /> • Oily wastes that are not used oil; <br /> • Oily wastewaters that are not used oil; <br /> • Tank bottoms; <br /> • Used oil processing bottoms; <br /> • Used oil re-refining distillation bottoms; <br /> • Cooking oils (edible); <br /> • Grease; <br /> • Oils containing 5 parts per million (ppm) polychlorinated biphenyls (PCBs) or <br /> greater; and <br /> • Oils containing more than 1,000 ppm total halogens. <br /> The Mixture Rule <br /> The used oil management regulations set forth six rules regarding the management of <br /> used oil that is mixed with a hazardous waste: <br /> A 1s mana d as: , <br /> Used oil and listed hazardous waste Hazardous waste <br /> Used oil and characteristic hazardous 1)Hazardous waste if it exhibits a <br /> waste hazardous characteristic <br /> 2)Used oil if it does not exhibit a hazardous <br /> characteristic <br /> Used oil and hazardous waste that is 1)Used oil if it does not exhibit the <br /> hazardous only because of the characteristic of ignitability <br /> characteristic of i nitabilit 2 Hazardous waste if it exhibits ignitabihty <br /> 3of6 <br />