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0 0 <br />22 <br />(b) The owner or operfitor may amend his closure plan at any time <br />during the active life of the facility. (The active life of <br />the facility is that period during which wastes are periodi- <br />cally received.) The owner or operator shall amend his plan <br />any time changes in operating plans or facility design affect <br />the closure plan. <br />owner or operator shall submit his closure plan to the <br />RegionalCalifornia Quality ControlBoard at least <br />days before the date he expects to begin closure. The <br />California Regional <br />_ i .: QualityControl Boardwill modify, <br />approve, or.disapprove the plan within 90 days of receipt and <br />after providing the owner or operator and the affected public <br />(through a newspaper notice) the opportunity to submit written <br />comments. <br />3. Time allowed for closure. <br />(a) Within 90 days after receiving the final volume of hazardous <br />wastes, the owner or operator shall treat all hazardous <br />wastes in storage or in treatment, or remove them from the <br />site, or dispose of them on-site, in accordance with the <br />approved closure plan. <br />(b) The owner or operator shall complete closure activities in <br />accordance with the approved closure plan and within six <br />months after receiving the final volume of wastes. The <br />California Regional Water Quality Control Board may approve <br />a longer closure period under Item 2 (c) if the owner or <br />operator can demonstrate that: (1) the required or planned <br />closure activities will, of necessity, take him longer than <br />six months to complete, and (2) that he has taken all steps <br />to eliminate any significant threat to human health and the <br />environment from the unclosed but inactive facility. <br />4. Disposal or decontaminationequipment. <br />When closure is completed, all facility equipment and structures <br />shall have been properly disposed of, or decontaminated by removing <br />all hazardous waste and residues. <br />5• Certification of closure. <br />When closure is completed, the owner or operator shall submit to <br />the California Regional Water Quality Control Board certification <br />both by the owner or operator and by an independent registered <br />professional engineer that the facility has been closed in accor- <br />dance with the specifications in the approved closure pian. <br />