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r -A <br />r <br />39 <br />(2) Waste and waste residues; <br />(3) The liner, if any; and <br />(4) Underlying and surrounding contaminated soil. <br />(b) If the owner or operator removes all the impoundment materials <br />listed in Item 5(a), or can demonstrate that none of the <br />materials listed in Item 5(a) remaining at any stage of removal <br />are hazardous wastes, the impoundment is not further subject <br />to the requirements of this document. <br />(c) If the owner or operator does not remove all the impoundment <br />materials listed in Item 5(a) or does not make the demonstration <br />in Item 5(b), he shall close the impoundment and provide post -closure <br />care as specified elsewhere in this document. 'If necessary <br />to support the final cover specified in the approved closure <br />plan, the owner or operator shall treat remaining liquids, <br />residues, and soils by removal of liquids, drying, or other means. <br />6. Ignitable or reactive wastes <br />(a) Ignitable or reactive waste shall not be placed in a surface <br />impoundment, unless: <br />(1) The waste is treated, rendered, or mixed before or immediately <br />after placement in the impoundment so that: <br />(i) The resulting waste, mixture, or dissolution of <br />material no longer meets the definition of ignitable <br />or reactive waste; and <br />(ii) The requirements of Item 7(b), Part III of this document <br />are met; or <br />(2) The surface impoundment is used solely for emergencies. <br />7. Incompatible wastes <br />Incompatible wastes, or incompatible wastes and materials, shall not <br />be placed in the same surface impoundment, unless the requirements of <br />Item 7(b), Part III of this document are met. <br />