SITE INFORMATION AND CORRESPONDENCE

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i • (2) Data gathered from monitoring equipment (e.g. , pressure and temperature gauges) , at least once each operating day, to ensure that the treatment process or equipment is being operated according to its design; (3) The construction materials of the treatment process or equipment, at least weekly, to detect corrosion or leaking of fixtures or seams; and (4) The construction materials of, and the area immediately surrounding, discharge confinement structures (e.g. , dikes) , at least weekly, to detect erosion or obvious signs of leakage (e.g. , wet spots or dead vegetation) . 4. Closure. At closure, all hazardous waste and hazardous waste residues shall be removed from treatment processes or equipment, discharge control equipment, and discharge confinement structures . 5. Ignitable or reactive waste. (a) Ignitable or reactive waste shall not be placed in a treatment process or equipment unless : (1 ) The waste is treated, rendered, or mixed before or immedi - ately after placement in the treatment process or equipment so that the resulting waste, mixture, or dissolution of material no longer meets the definition of ignitable or reactive waste, and the requirements of Item 7 (b) , Part III of this document are met; or (2) The waste is treated in such a way that it is protected from any material or conditions which may cause the waste to ignite or react. 6. Incompatible wastes. (a) Incompatible wastes, or incompatible wastes and materials, shall not be placed in the same treatment process or equip- ment, unless the requirements of Item 7 (b) , Part III of this document are met. (b) Hazardous waste shall not be placed in unwashed treatment equipment which previously held an incompatible waste or material , unless the requirements of Item 7 (b) , Part III of this document are met.