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In addition,EPA expects USTs storing DEF will be both compatible and secondarily <br /> contained. International standards for DEF set strict requirements for compatibility in order to <br /> I avoid product contamination caused by materials in the storage tank system degrading into the <br /> DEF and also to prevent releases due to corrosion. Further,manufacturers recommend that <br /> underground DEF tank systems use secondary containment technologieswith interstitial <br /> monitoring. EPA expects that owners and operators of DEF USTs will generally follow these <br /> industry,manufacturer, and international standards for the storage of DEF in USTs. <br /> If in the future EPA finds that ammonia released from DEF USTs endangers human <br /> health and the environment,EPA may revisit the de minimis exclusion analysis contained in this <br /> I memorandum. It is important to note that some states may choose to be more stringent than <br /> federal regulations and require DEF USTs to fully comply with state UST regulations. <br /> 1 If you have any questions about this interpretation,please contact Andrea Barbery at <br /> barbery.andrea@a)a.gov or 703/603-7137. <br /> cc: OUST Management <br /> OUST Regional Liaisons <br /> Kathy Naau, OGC <br /> i <br /> s ' <br /> i <br /> I <br /> i <br /> i <br /> I <br />